Trim trailing white spaces.
[geeqie.git] / src / pixbuf-renderer.c
index 556ee67..688a480 100644 (file)
@@ -1,6 +1,7 @@
 /*
  * Geeqie
  * (C) 2006 John Ellis
+ * Copyright (C) 2008 - 2012 The Geeqie Team
  *
  * Author: John Ellis
  *
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <math.h>
+
+#include "main.h"
 #include "pixbuf-renderer.h"
+#include "renderer-tiles.h"
+#include "renderer-clutter.h"
+
 #include "intl.h"
+#include "layout.h"
 
 #include <gtk/gtk.h>
 
-
 /* comment this out if not using this from within Geeqie
  * defining GQ_BUILD does these things:
  *   - Sets the shift-click scroller pixbuf to a nice icon instead of a black box
  */
 #define GQ_BUILD 1
 
-
 #ifdef GQ_BUILD
-       #include "pixbuf_util.h"
-       
-       /* for debug */
-       #include "main.h"
+#include "main.h"
+#include "pixbuf_util.h"
+#include "exif.h"
+#else
+typedef enum {
+       EXIF_ORIENTATION_UNKNOWN        = 0,
+       EXIF_ORIENTATION_TOP_LEFT       = 1,
+       EXIF_ORIENTATION_TOP_RIGHT      = 2,
+       EXIF_ORIENTATION_BOTTOM_RIGHT   = 3,
+       EXIF_ORIENTATION_BOTTOM_LEFT    = 4,
+       EXIF_ORIENTATION_LEFT_TOP       = 5,
+       EXIF_ORIENTATION_RIGHT_TOP      = 6,
+       EXIF_ORIENTATION_RIGHT_BOTTOM   = 7,
+       EXIF_ORIENTATION_LEFT_BOTTOM    = 8
+} ExifOrientationType;
 #endif
 
 
-/* size to use when breaking up image pane for rendering */
-#define PR_TILE_SIZE 128
-
-/* default size of tile cache (mb) */
-#define PR_CACHE_SIZE_DEFAULT 8
-
 /* default min and max zoom */
 #define PR_ZOOM_MIN -32.0
 #define PR_ZOOM_MAX 32.0
 #define PR_SCROLLER_UPDATES_PER_SEC 30
 #define PR_SCROLLER_DEAD_ZONE 6
 
-/* alpha channel checkerboard background (same as gimp) */
-#define PR_ALPHA_CHECK1 0x00999999
-#define PR_ALPHA_CHECK2 0x00666666
-#define PR_ALPHA_CHECK_SIZE 16
-
 /* when scaling image to below this size, use nearest pixel for scaling
  * (below about 4, the other scale types become slow generating their conversion tables)
  */
 #define PR_MIN_SCALE_SIZE 8
 
-typedef enum {
-       EXIF_ORIENTATION_UNKNOWN        = 0,
-       EXIF_ORIENTATION_TOP_LEFT       = 1,
-       EXIF_ORIENTATION_TOP_RIGHT      = 2,
-       EXIF_ORIENTATION_BOTTOM_RIGHT   = 3,
-       EXIF_ORIENTATION_BOTTOM_LEFT    = 4,
-       EXIF_ORIENTATION_LEFT_TOP       = 5,
-       EXIF_ORIENTATION_RIGHT_TOP      = 6,
-       EXIF_ORIENTATION_RIGHT_BOTTOM   = 7,
-       EXIF_ORIENTATION_LEFT_BOTTOM    = 8
-} ExifOrientationType;
-
-
-typedef enum {
-       TILE_RENDER_NONE = 0,   /* do nothing */
-       TILE_RENDER_AREA,       /* render an area of the tile */
-       TILE_RENDER_ALL         /* render the whole tile */
-} ImageTileRenderType;
-
-typedef struct _ImageTile ImageTile;
-typedef struct _QueueData QueueData;
-
-struct _ImageTile
-{
-       GdkPixmap *pixmap;      /* off screen buffer */
-       GdkPixbuf *pixbuf;      /* pixbuf area for zooming */
-       gint x;                 /* x offset into image */
-       gint y;                 /* y offset into image */
-       gint w;                 /* width that is visible (may be less if at edge of image) */
-       gint h;                 /* height '' */
-
-       gboolean blank;
-
-/* render_todo: (explanation)
-       NONE    do nothing
-       AREA    render area of tile, usually only used when loading an image
-               note: will jump to an ALL if render_done is not ALL.
-       ALL     render entire tile, if never done before w/ ALL, for expose events *only*
-*/
-
-       ImageTileRenderType render_todo;        /* what to do (see above) */
-       ImageTileRenderType render_done;        /* highest that has been done before on tile */
-
-       QueueData *qd;
-       QueueData *qd2;
-
-       guint size;             /* est. memory used by pixmap and pixbuf */
-};
-
-struct _QueueData
-{
-       ImageTile *it;
-       gint x;
-       gint y;
-       gint w;
-       gint h;
-       gboolean new_data;
-};
-
-typedef struct _SourceTile SourceTile;
-struct _SourceTile
-{
-       gint x;
-       gint y;
-       GdkPixbuf *pixbuf;
-       gboolean blank;
-};
-
-typedef struct _OverlayData OverlayData;
-struct _OverlayData
-{
-       gint id;
-
-       GdkPixbuf *pixbuf;
-       GdkWindow *window;
-
-       gint x;
-       gint y;
-       gint relative;  /* x,y coordinates are relative, negative values start bottom right */
-
-       gint always;    /* hide temporarily when scrolling (not yet implemented) */
-};
-
 enum {
        SIGNAL_ZOOM = 0,
        SIGNAL_CLICKED,
        SIGNAL_SCROLL_NOTIFY,
        SIGNAL_RENDER_COMPLETE,
        SIGNAL_DRAG,
+       SIGNAL_UPDATE_PIXEL,
        SIGNAL_COUNT
 };
 
@@ -162,7 +86,6 @@ enum {
        PROP_ZOOM_QUALITY,
        PROP_ZOOM_2PASS,
        PROP_ZOOM_EXPAND,
-       PROP_DITHER_QUALITY,
        PROP_SCROLL_RESET,
        PROP_DELAY_FLIP,
        PROP_LOADING,
@@ -176,7 +99,14 @@ enum {
        PROP_AUTOFIT_LIMIT_VALUE
 };
 
-
+typedef enum {
+       PR_ZOOM_NONE            = 0,
+       PR_ZOOM_FORCE           = 1 << 0,
+       PR_ZOOM_NEW             = 1 << 1,
+       PR_ZOOM_CENTER          = 1 << 2,
+       PR_ZOOM_INVALIDATE      = 1 << 3,
+       PR_ZOOM_LAZY            = 1 << 4  /* wait with redraw for pixbuf_renderer_area_changed */
+} PrZoomFlags;
 
 static guint signals[SIGNAL_COUNT] = { 0 };
 static GtkEventBoxClass *parent_class = NULL;
@@ -190,33 +120,17 @@ static void pixbuf_renderer_set_property(GObject *object, guint prop_id,
                                         const GValue *value, GParamSpec *pspec);
 static void pixbuf_renderer_get_property(GObject *object, guint prop_id,
                                         GValue *value, GParamSpec *pspec);
-static gint pixbuf_renderer_expose(GtkWidget *widget, GdkEventExpose *event);
-
-static void pr_render_complete_signal(PixbufRenderer *pr);
-
-static void pr_overlay_list_clear(PixbufRenderer *pr);
-static void pr_scroller_timer_set(PixbufRenderer *pr, gint start);
-static void pr_border_draw(PixbufRenderer *pr, gint x, gint y, gint w, gint h);
+static void pr_scroller_timer_set(PixbufRenderer *pr, gboolean start);
 
 
 static void pr_source_tile_free_all(PixbufRenderer *pr);
-static void pr_tile_free_all(PixbufRenderer *pr);
-static void pr_tile_invalidate_region(PixbufRenderer *pr, gint x, gint y, gint w, gint h);
-static gint pr_tile_is_visible(PixbufRenderer *pr, ImageTile *it);
-static void pr_queue_clear(PixbufRenderer *pr);
-static void pr_queue_merge(QueueData *parent, QueueData *qd);
-static void pr_queue(PixbufRenderer *pr, gint x, gint y, gint w, gint h,
-                    gint clamp, ImageTileRenderType render, gint new_data, gint only_existing);
-
-static void pr_redraw(PixbufRenderer *pr, gint new_data);
 
 static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
-                        gint force, gint new,
-                        gint center_point, gint px, gint py);
+                        PrZoomFlags flags, gint px, gint py);
 
 static void pr_signals_connect(PixbufRenderer *pr);
 static void pr_size_cb(GtkWidget *widget, GtkAllocation *allocation, gpointer data);
-static void pixbuf_renderer_paint(PixbufRenderer *pr, GdkRectangle *area);
+static void pr_stereo_temp_disable(PixbufRenderer *pr, gboolean disable);
 
 
 /*
@@ -233,15 +147,16 @@ GType pixbuf_renderer_get_type(void)
                {
                static const GTypeInfo pixbuf_renderer_info =
                        {
-                       sizeof(PixbufRendererClass),
+                       sizeof(PixbufRendererClass), /* class_size */
                        NULL,           /* base_init */
                        NULL,           /* base_finalize */
                        (GClassInitFunc)pixbuf_renderer_class_init,
                        NULL,           /* class_finalize */
                        NULL,           /* class_data */
-                       sizeof(PixbufRenderer),
+                       sizeof(PixbufRenderer), /* instance_size */
                        0,              /* n_preallocs */
-                       (GInstanceInitFunc)pixbuf_renderer_init,
+                       (GInstanceInitFunc)pixbuf_renderer_init, /* instance_init */
+                       NULL,           /* value_table */
                        };
 
                pixbuf_renderer_type = g_type_register_static(GTK_TYPE_EVENT_BOX, "PixbufRenderer",
@@ -254,7 +169,6 @@ GType pixbuf_renderer_get_type(void)
 static void pixbuf_renderer_class_init(PixbufRendererClass *class)
 {
        GObjectClass *gobject_class = G_OBJECT_CLASS(class);
-       GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(class);
 
        parent_class = g_type_class_peek_parent(class);
 
@@ -263,8 +177,6 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
 
        gobject_class->finalize = pixbuf_renderer_finalize;
 
-       widget_class->expose_event = pixbuf_renderer_expose;
-
        g_object_class_install_property(gobject_class,
                                        PROP_ZOOM_MIN,
                                        g_param_spec_double("zoom_min",
@@ -310,17 +222,6 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                                                             NULL,
                                                             FALSE,
                                                             G_PARAM_READABLE | G_PARAM_WRITABLE));
-
-       g_object_class_install_property(gobject_class,
-                                       PROP_DITHER_QUALITY,
-                                       g_param_spec_uint("dither_quality",
-                                                         "Dither quality",
-                                                         NULL,
-                                                         GDK_RGB_DITHER_NONE,
-                                                         GDK_RGB_DITHER_MAX,
-                                                         GDK_RGB_DITHER_NORMAL,
-                                                         G_PARAM_READABLE | G_PARAM_WRITABLE));
-
        g_object_class_install_property(gobject_class,
                                        PROP_SCROLL_RESET,
                                        g_param_spec_uint("scroll_reset",
@@ -400,7 +301,7 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                                                          150,
                                                          100,
                                                          G_PARAM_READABLE | G_PARAM_WRITABLE));
-       
+
        g_object_class_install_property(gobject_class,
                                        PROP_AUTOFIT_LIMIT,
                                        g_param_spec_boolean("autofit_limit",
@@ -420,7 +321,7 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                                                          G_PARAM_READABLE | G_PARAM_WRITABLE));
 
 
-       signals[SIGNAL_ZOOM] = 
+       signals[SIGNAL_ZOOM] =
                g_signal_new("zoom",
                             G_OBJECT_CLASS_TYPE(gobject_class),
                             G_SIGNAL_RUN_LAST,
@@ -430,7 +331,7 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                             G_TYPE_NONE, 1,
                             G_TYPE_DOUBLE);
 
-       signals[SIGNAL_CLICKED] = 
+       signals[SIGNAL_CLICKED] =
                g_signal_new("clicked",
                             G_OBJECT_CLASS_TYPE(gobject_class),
                             G_SIGNAL_RUN_LAST,
@@ -440,7 +341,7 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                             G_TYPE_NONE, 1,
                             GDK_TYPE_EVENT);
 
-       signals[SIGNAL_SCROLL_NOTIFY] = 
+       signals[SIGNAL_SCROLL_NOTIFY] =
                g_signal_new("scroll-notify",
                             G_OBJECT_CLASS_TYPE(gobject_class),
                             G_SIGNAL_RUN_LAST,
@@ -449,7 +350,7 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                             g_cclosure_marshal_VOID__VOID,
                             G_TYPE_NONE, 0);
 
-       signals[SIGNAL_RENDER_COMPLETE] = 
+       signals[SIGNAL_RENDER_COMPLETE] =
                g_signal_new("render-complete",
                             G_OBJECT_CLASS_TYPE(gobject_class),
                             G_SIGNAL_RUN_LAST,
@@ -458,7 +359,7 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                             g_cclosure_marshal_VOID__VOID,
                             G_TYPE_NONE, 0);
 
-       signals[SIGNAL_DRAG] = 
+       signals[SIGNAL_DRAG] =
                g_signal_new("drag",
                             G_OBJECT_CLASS_TYPE(gobject_class),
                             G_SIGNAL_RUN_LAST,
@@ -467,8 +368,31 @@ static void pixbuf_renderer_class_init(PixbufRendererClass *class)
                             g_cclosure_marshal_VOID__BOXED,
                             G_TYPE_NONE, 1,
                             GDK_TYPE_EVENT);
+                            
+       signals[SIGNAL_UPDATE_PIXEL] =
+               g_signal_new("update-pixel",
+                            G_OBJECT_CLASS_TYPE(gobject_class),
+                            G_SIGNAL_RUN_LAST,
+                            G_STRUCT_OFFSET(PixbufRendererClass, update_pixel),
+                            NULL, NULL,
+                            g_cclosure_marshal_VOID__VOID,
+                            G_TYPE_NONE, 0);
+}
+
+static RendererFuncs *pr_backend_renderer_new(PixbufRenderer *pr)
+{
+       if (options->image.use_clutter_renderer)
+               {
+#ifdef HAVE_CLUTTER
+               return renderer_clutter_new(pr);
+#else
+               DEBUG_0("Geeqie is built without clutter renderer support");
+#endif
+               }
+       return renderer_tiles_new(pr);
 }
 
+
 static void pixbuf_renderer_init(PixbufRenderer *pr)
 {
        GtkWidget *box;
@@ -482,30 +406,32 @@ static void pixbuf_renderer_init(PixbufRenderer *pr)
 
        pr->zoom = 1.0;
        pr->scale = 1.0;
-
-       pr->dither_quality = GDK_RGB_DITHER_NORMAL;
+       pr->aspect_ratio = 1.0;
 
        pr->scroll_reset = PR_SCROLL_RESET_TOPLEFT;
 
-       pr->draw_idle_id = -1;
-
-       pr->tile_width = PR_TILE_SIZE;
-       pr->tile_height = PR_TILE_SIZE;
-
-       pr->tiles = NULL;
-       pr->tile_cache_size = 0;
-
-       pr->tile_cache_max = PR_CACHE_SIZE_DEFAULT;
-
-       pr->scroller_id = -1;
+       pr->scroller_id = 0;
        pr->scroller_overlay = -1;
+       
+       pr->x_mouse = -1;
+       pr->y_mouse = -1;
 
        pr->source_tiles_enabled = FALSE;
        pr->source_tiles = NULL;
 
        pr->orientation = 1;
 
+       pr->norm_center_x = 0.5;
+       pr->norm_center_y = 0.5;
+       
+       pr->stereo_mode = PR_STEREO_NONE;
+       
+       pr->renderer = pr_backend_renderer_new(pr);
+       
+       pr->renderer2 = NULL;
+
        gtk_widget_set_double_buffered(box, FALSE);
+       gtk_widget_set_app_paintable(box, TRUE);
        g_signal_connect_after(G_OBJECT(box), "size_allocate",
                               G_CALLBACK(pr_size_cb), pr);
 
@@ -518,19 +444,18 @@ static void pixbuf_renderer_finalize(GObject *object)
 
        pr = PIXBUF_RENDERER(object);
 
-       pr_queue_clear(pr);
-       pr_tile_free_all(pr);
+       pr->renderer->free(pr->renderer);
+       if (pr->renderer2) pr->renderer2->free(pr->renderer2);
+
 
        if (pr->pixbuf) g_object_unref(pr->pixbuf);
-       if (pr->spare_tile) gdk_pixbuf_unref(pr->spare_tile);
 
        pr_scroller_timer_set(pr, FALSE);
-       pr_overlay_list_clear(pr);
 
        pr_source_tile_free_all(pr);
 }
 
-PixbufRendererpixbuf_renderer_new(void)
+PixbufRenderer *pixbuf_renderer_new(void)
 {
        return g_object_new(TYPE_PIXBUF_RENDERER, NULL);
 }
@@ -559,9 +484,6 @@ static void pixbuf_renderer_set_property(GObject *object, guint prop_id,
                case PROP_ZOOM_EXPAND:
                        pr->zoom_expand = g_value_get_boolean(value);
                        break;
-               case PROP_DITHER_QUALITY:
-                       pr->dither_quality = g_value_get_uint(value);
-                       break;
                case PROP_SCROLL_RESET:
                        pr->scroll_reset = g_value_get_uint(value);
                        break;
@@ -575,7 +497,7 @@ static void pixbuf_renderer_set_property(GObject *object, guint prop_id,
                        pr->complete = g_value_get_boolean(value);
                        break;
                case PROP_CACHE_SIZE_DISPLAY:
-                       pr->tile_cache_max = g_value_get_uint(value);
+//                     pr->tile_cache_max = g_value_get_uint(value);
                        break;
                case PROP_CACHE_SIZE_TILES:
                        pr->source_tiles_cache_size = g_value_get_uint(value);
@@ -625,9 +547,6 @@ static void pixbuf_renderer_get_property(GObject *object, guint prop_id,
                case PROP_ZOOM_EXPAND:
                        g_value_set_boolean(value, pr->zoom_expand);
                        break;
-               case PROP_DITHER_QUALITY:
-                       g_value_set_uint(value, pr->dither_quality);
-                       break;
                case PROP_SCROLL_RESET:
                        g_value_set_uint(value, pr->scroll_reset);
                        break;
@@ -641,7 +560,7 @@ static void pixbuf_renderer_get_property(GObject *object, guint prop_id,
                        g_value_set_boolean(value, pr->complete);
                        break;
                case PROP_CACHE_SIZE_DISPLAY:
-                       g_value_set_uint(value, pr->tile_cache_max);
+//                     g_value_set_uint(value, pr->tile_cache_max);
                        break;
                case PROP_CACHE_SIZE_TILES:
                        g_value_set_uint(value, pr->source_tiles_cache_size);
@@ -667,33 +586,6 @@ static void pixbuf_renderer_get_property(GObject *object, guint prop_id,
                }
 }
 
-static gint pixbuf_renderer_expose(GtkWidget *widget, GdkEventExpose *event)
-{
-       if (GTK_WIDGET_DRAWABLE(widget))
-               {
-               if (!GTK_WIDGET_NO_WINDOW(widget))
-                       {
-                       if (event->window != widget->window)
-                               {
-                               GdkRectangle area;
-
-                               gdk_window_get_position(event->window, &area.x, &area.y);
-
-                               area.x += event->area.x;
-                               area.y += event->area.y;
-                               area.width = event->area.width;
-                               area.height = event->area.height;
-                               pixbuf_renderer_paint(PIXBUF_RENDERER(widget), &area);
-                               }
-                       else
-                               {
-                               pixbuf_renderer_paint(PIXBUF_RENDERER(widget), &event->area);
-                               }
-                       }
-               }
-
-       return FALSE;
-}
 
 /*
  *-------------------------------------------------------------------
@@ -705,7 +597,7 @@ static void widget_set_cursor(GtkWidget *widget, gint icon)
 {
        GdkCursor *cursor;
 
-       if (!widget->window) return;
+       if (!gtk_widget_get_window(widget)) return;
 
        if (icon == -1)
                {
@@ -713,26 +605,17 @@ static void widget_set_cursor(GtkWidget *widget, gint icon)
                }
        else
                {
-               cursor = gdk_cursor_new (icon);
+               cursor = gdk_cursor_new(icon);
                }
 
-       gdk_window_set_cursor(widget->window, cursor);
+       gdk_window_set_cursor(gtk_widget_get_window(widget), cursor);
 
        if (cursor) gdk_cursor_unref(cursor);
 }
 
-static gint pixmap_calc_size(GdkPixmap *pixmap)
-{
-       gint w, h, d;
-
-       d = gdk_drawable_get_depth(pixmap);
-       gdk_drawable_get_size(pixmap, &w, &h);
-       return w * h * (d / 8);
-}
-
-static gint pr_clip_region(gint x, gint y, gint w, gint h,
-                          gint clip_x, gint clip_y, gint clip_w, gint clip_h,
-                          gint *rx, gint *ry, gint *rw, gint *rh)
+gboolean pr_clip_region(gint x, gint y, gint w, gint h,
+                              gint clip_x, gint clip_y, gint clip_w, gint clip_h,
+                              gint *rx, gint *ry, gint *rw, gint *rh)
 {
        if (clip_x + clip_w <= x ||
            clip_x >= x + w ||
@@ -751,26 +634,28 @@ static gint pr_clip_region(gint x, gint y, gint w, gint h,
        return TRUE;
 }
 
-static gint pr_parent_window_sizable(PixbufRenderer *pr)
+static gboolean pr_parent_window_sizable(PixbufRenderer *pr)
 {
        GdkWindowState state;
 
        if (!pr->parent_window) return FALSE;
        if (!pr->window_fit) return FALSE;
-       if (!GTK_WIDGET(pr)->window) return FALSE;
+       if (!gtk_widget_get_window(GTK_WIDGET(pr))) return FALSE;
 
-       if (!pr->parent_window->window) return FALSE;
-       state = gdk_window_get_state(pr->parent_window->window);
+       if (!gtk_widget_get_window(pr->parent_window)) return FALSE;
+       state = gdk_window_get_state(gtk_widget_get_window(pr->parent_window));
        if (state & GDK_WINDOW_STATE_MAXIMIZED) return FALSE;
 
        return TRUE;
 }
 
-static gint pr_parent_window_resize(PixbufRenderer *pr, gint w, gint h)
+static gboolean pr_parent_window_resize(PixbufRenderer *pr, gint w, gint h)
 {
        GtkWidget *widget;
        GtkWidget *parent;
        gint ww, wh;
+       GtkAllocation widget_allocation;
+       GtkAllocation parent_allocation;
 
        if (!pr_parent_window_sizable(pr)) return FALSE;
 
@@ -786,13 +671,17 @@ static gint pr_parent_window_resize(PixbufRenderer *pr, gint w, gint h)
        widget = GTK_WIDGET(pr);
        parent = GTK_WIDGET(pr->parent_window);
 
-       w += (parent->allocation.width - widget->allocation.width);
-       h += (parent->allocation.height - widget->allocation.height);
+       gtk_widget_get_allocation(widget, &widget_allocation);
+       gtk_widget_get_allocation(parent, &parent_allocation);
 
-       gdk_drawable_get_size(parent->window, &ww, &wh);
+       w += (parent_allocation.width - widget_allocation.width);
+       h += (parent_allocation.height - widget_allocation.height);
+
+       ww = gdk_window_get_width(gtk_widget_get_window(parent));
+       wh = gdk_window_get_height(gtk_widget_get_window(parent));
        if (w == ww && h == wh) return FALSE;
 
-       gdk_window_resize(parent->window, w, h);
+       gdk_window_resize(gtk_widget_get_window(parent), w, h);
 
        return TRUE;
 }
@@ -819,288 +708,31 @@ GtkWindow *pixbuf_renderer_get_parent(PixbufRenderer *pr)
  *-------------------------------------------------------------------
  */
 
-static void pr_overlay_get_position(PixbufRenderer *pr, OverlayData *od,
-                                   gint *x, gint *y, gint *w, gint *h)
-{
-       gint px, py, pw, ph;
-
-       pw = gdk_pixbuf_get_width(od->pixbuf);
-       ph = gdk_pixbuf_get_height(od->pixbuf);
-       px = od->x;
-       py = od->y;
-
-       if (od->relative)
-               {
-               if (px < 0) px = pr->window_width - pw + px;
-               if (py < 0) py = pr->window_height - ph + py;
-               }
-
-       if (x) *x = px;
-       if (y) *y = py;
-       if (w) *w = pw;
-       if (h) *h = ph;
-}
-
-static void pr_overlay_draw(PixbufRenderer *pr, gint x, gint y, gint w, gint h,
-                           ImageTile *it)
-{
-       GtkWidget *box;
-       GList *work;
-
-       box = GTK_WIDGET(pr);
-
-       work = pr->overlay_list;
-       while (work)
-               {
-               OverlayData *od;
-               gint px, py, pw, ph;
-               gint rx, ry, rw, rh;
-
-               od = work->data;
-               work = work->next;
-
-               pr_overlay_get_position(pr, od, &px, &py, &pw, &ph);
-               if (pr_clip_region(x, y, w, h, px, py, pw, ph, &rx, &ry, &rw, &rh))
-                       {
-                       if (!pr->overlay_buffer)
-                               {
-                               pr->overlay_buffer = gdk_pixmap_new(((GtkWidget *)pr)->window, pr->tile_width, pr->tile_height, -1);
-                               }
-
-                       if (it)
-                               {
-                               gdk_draw_drawable(pr->overlay_buffer, box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                                 it->pixmap,
-                                                 rx - (pr->x_offset + (it->x - pr->x_scroll)),
-                                                 ry - (pr->y_offset + (it->y - pr->y_scroll)),
-                                                 0, 0, rw, rh);
-                               gdk_draw_pixbuf(pr->overlay_buffer,
-                                               box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                               od->pixbuf,
-                                               rx - px, ry - py,
-                                               0, 0, rw, rh,
-                                               pr->dither_quality, rx, ry);
-                               gdk_draw_drawable(od->window, box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                                 pr->overlay_buffer,
-                                                 0, 0,
-                                                 rx - px, ry - py, rw, rh);
-                               }
-                       else
-                               {
-                               /* no ImageTile means region may be larger than our scratch buffer */
-                               gint sx, sy;
-
-                               for (sx = rx; sx < rx + rw; sx += pr->tile_width)
-                                   for(sy = ry; sy < ry + rh; sy += pr->tile_height)
-                                       {
-                                       gint sw, sh;
-
-                                       sw = MIN(rx + rw - sx, pr->tile_width);
-                                       sh = MIN(ry + rh - sy, pr->tile_height);
-
-                                       gdk_draw_rectangle(pr->overlay_buffer,
-                                                          box->style->bg_gc[GTK_WIDGET_STATE(box)], TRUE,
-                                                          0, 0, sw, sh);
-                                       gdk_draw_pixbuf(pr->overlay_buffer,
-                                                       box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                                       od->pixbuf,
-                                                       sx - px, sy - py,
-                                                       0, 0, sw, sh,
-                                                       pr->dither_quality, sx, sy);
-                                       gdk_draw_drawable(od->window, box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                                         pr->overlay_buffer,
-                                                         0, 0,
-                                                         sx - px, sy - py, sw, sh);
-                                       }
-                               }
-                       }
-               }
-}
-
-static void pr_overlay_queue_draw(PixbufRenderer *pr, OverlayData *od)
-{
-       gint x, y, w, h;
-
-       pr_overlay_get_position(pr, od, &x, &y, &w, &h);
-       pr_queue(pr, pr->x_scroll - pr->x_offset + x,
-                pr->y_scroll - pr->y_offset + y,
-                w, h,
-                FALSE, TILE_RENDER_ALL, FALSE, FALSE);
-
-       pr_border_draw(pr, x, y, w, h);
-}
-
-static void pr_overlay_queue_all(PixbufRenderer *pr)
-{
-       GList *work;
-
-       work = pr->overlay_list;
-       while (work)
-               {
-               OverlayData *od = work->data;
-               work = work->next;
-
-               pr_overlay_queue_draw(pr, od);
-               }
-}
-
-static void pr_overlay_update_sizes(PixbufRenderer *pr)
-{
-       GList *work;
-
-       work = pr->overlay_list;
-       while (work)
-               {
-               OverlayData *od = work->data;
-               work = work->next;
-
-               if (od->relative && od->window)
-                       {
-                       gint x, y, w, h;
-
-                       pr_overlay_get_position(pr, od, &x, &y, &w, &h);
-                       gdk_window_move_resize(od->window, x, y, w, h);
-                       }
-               }
-}
-
-static OverlayData *pr_overlay_find(PixbufRenderer *pr, gint id)
-{
-       GList *work;
-
-       work = pr->overlay_list;
-       while (work)
-               {
-               OverlayData *od = work->data;
-               work = work->next;
-
-               if (od->id == id) return od;
-               }
-
-       return NULL;
-}
 
 gint pixbuf_renderer_overlay_add(PixbufRenderer *pr, GdkPixbuf *pixbuf, gint x, gint y,
-                                gint relative, gint always)
-{
-       OverlayData *od;
-       gint id;
-       gint px, py, pw, ph;
-       GdkWindowAttr attributes;
-       gint attributes_mask;
-
-       g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), -1);
-       g_return_val_if_fail(pixbuf != NULL, -1);
-
-       id = 1;
-       while (pr_overlay_find(pr, id)) id++;
-
-       od = g_new0(OverlayData, 1);
-       od->id = id;
-       od->pixbuf = pixbuf;
-       g_object_ref(G_OBJECT(od->pixbuf));
-       od->x = x;
-       od->y = y;
-       od->relative = relative;
-       od->always = always;
-
-       pr_overlay_get_position(pr, od, &px, &py, &pw, &ph);
-
-       attributes.window_type = GDK_WINDOW_CHILD;
-       attributes.wclass = GDK_INPUT_OUTPUT;
-       attributes.width = pw;
-       attributes.height = ph;
-       attributes.event_mask = GDK_EXPOSURE_MASK;
-       attributes_mask = 0;
-
-       od->window = gdk_window_new(GTK_WIDGET(pr)->window, &attributes, attributes_mask);
-       gdk_window_set_user_data (od->window, pr);
-       gdk_window_move(od->window, px, py);
-       gdk_window_show(od->window);
-
-       pr->overlay_list = g_list_append(pr->overlay_list, od);
-
-       pr_overlay_queue_draw(pr, od);
-
-       return od->id;
-}
-
-static void pr_overlay_free(PixbufRenderer *pr, OverlayData *od)
-{
-       pr->overlay_list = g_list_remove(pr->overlay_list, od);
-
-       if (od->pixbuf) g_object_unref(G_OBJECT(od->pixbuf));
-       if (od->window) gdk_window_destroy(od->window);
-       g_free(od);
-
-       if (!pr->overlay_list && pr->overlay_buffer)
-               {
-               g_object_unref(pr->overlay_buffer);
-               pr->overlay_buffer = NULL;
-               }
-}
-
-static void pr_overlay_list_clear(PixbufRenderer *pr)
+                                OverlayRendererFlags flags)
 {
-       while (pr->overlay_list)
-               {
-               OverlayData *od;
-
-               od = pr->overlay_list->data;
-               pr_overlay_free(pr, od);
-               }
+       /* let's assume both renderers returns the same value */
+       if (pr->renderer2) pr->renderer2->overlay_add(pr->renderer2, pixbuf, x, y, flags);
+       return pr->renderer->overlay_add(pr->renderer, pixbuf, x, y, flags);
 }
 
 void pixbuf_renderer_overlay_set(PixbufRenderer *pr, gint id, GdkPixbuf *pixbuf, gint x, gint y)
 {
-       OverlayData *od;
-
-       g_return_if_fail(IS_PIXBUF_RENDERER(pr));
-
-       od = pr_overlay_find(pr, id);
-       if (!od) return;
-
-       if (pixbuf)
-               {
-               gint px, py, pw, ph;
-
-               g_object_ref(G_OBJECT(pixbuf));
-               g_object_unref(G_OBJECT(od->pixbuf));
-               od->pixbuf = pixbuf;
-
-               od->x = x;
-               od->y = y;
-
-               pr_overlay_queue_draw(pr, od);
-               pr_overlay_get_position(pr, od, &px, &py, &pw, &ph);
-               gdk_window_move_resize(od->window, px, py, pw, ph);
-               }
-       else
-               {
-               pr_overlay_queue_draw(pr, od);
-               pr_overlay_free(pr, od);
-               }
+       pr->renderer->overlay_set(pr->renderer, id, pixbuf, x, y);
+       if (pr->renderer2) pr->renderer2->overlay_set(pr->renderer2, id, pixbuf, x, y);
 }
 
-gint pixbuf_renderer_overlay_get(PixbufRenderer *pr, gint id, GdkPixbuf **pixbuf, gint *x, gint *y)
+gboolean pixbuf_renderer_overlay_get(PixbufRenderer *pr, gint id, GdkPixbuf **pixbuf, gint *x, gint *y)
 {
-       OverlayData *od;
-
-       g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
-
-       od = pr_overlay_find(pr, id);
-       if (!od) return FALSE;
-
-       if (pixbuf) *pixbuf = od->pixbuf;
-       if (x) *x = od->x;
-       if (y) *y = od->y;
-
-       return TRUE;
+       if (pr->renderer2) pr->renderer2->overlay_get(pr->renderer2, id, pixbuf, x, y);
+       return pr->renderer->overlay_get(pr->renderer, id, pixbuf, x, y);
 }
 
 void pixbuf_renderer_overlay_remove(PixbufRenderer *pr, gint id)
 {
-       pixbuf_renderer_overlay_set(pr, id, NULL, 0, 0);
+       pr->renderer->overlay_set(pr->renderer, id, NULL, 0, 0);
+       if (pr->renderer2) pr->renderer2->overlay_set(pr->renderer2, id, NULL, 0, 0);
 }
 
 /*
@@ -1197,12 +829,12 @@ static gboolean pr_scroller_update_cb(gpointer data)
        return TRUE;
 }
 
-static void pr_scroller_timer_set(PixbufRenderer *pr, gint start)
+static void pr_scroller_timer_set(PixbufRenderer *pr, gboolean start)
 {
-       if (pr->scroller_id != -1)
+       if (pr->scroller_id)
                {
                g_source_remove(pr->scroller_id);
-               pr->scroller_id = -1;
+               pr->scroller_id = 0;
                }
 
        if (start)
@@ -1228,7 +860,7 @@ static void pr_scroller_start(PixbufRenderer *pr, gint x, gint y)
                w = gdk_pixbuf_get_width(pixbuf);
                h = gdk_pixbuf_get_height(pixbuf);
 
-               pr->scroller_overlay = pixbuf_renderer_overlay_add(pr, pixbuf, x - w / 2, y - h / 2, FALSE, TRUE);
+               pr->scroller_overlay = pixbuf_renderer_overlay_add(pr, pixbuf, x - w / 2, y - h / 2, OVL_NORMAL);
                g_object_unref(pixbuf);
                }
 
@@ -1242,7 +874,7 @@ static void pr_scroller_start(PixbufRenderer *pr, gint x, gint y)
 
 static void pr_scroller_stop(PixbufRenderer *pr)
 {
-       if (pr->scroller_id == -1) return;
+       if (!pr->scroller_id) return;
 
        pixbuf_renderer_overlay_remove(pr, pr->scroller_overlay);
        pr->scroller_overlay = -1;
@@ -1256,106 +888,35 @@ static void pr_scroller_stop(PixbufRenderer *pr)
  *-------------------------------------------------------------------
  */
 
-static void pr_border_draw(PixbufRenderer *pr, gint x, gint y, gint w, gint h)
+void pixbuf_renderer_set_color(PixbufRenderer *pr, GdkColor *color)
 {
-       GtkWidget *box;
-       gint rx, ry, rw, rh;
+       GtkStyle *style;
+       GtkWidget *widget;
 
-       box = GTK_WIDGET(pr);
+       g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
-       if (!box->window) return;
+       widget = GTK_WIDGET(pr);
 
-       if (!pr->pixbuf && !pr->source_tiles_enabled)
-               {
-               if (pr_clip_region(x, y, w, h,
-                                  0, 0,
-                                  pr->window_width, pr->window_height,
-                                  &rx, &ry, &rw, &rh))
-                       {
-                       gdk_window_clear_area(box->window, rx, ry, rw, rh);
-                       pr_overlay_draw(pr, rx, ry, rw, rh, NULL);
-                       }
-               return;
+       if (color) {
+               GdkColor *slot;
+
+               style = gtk_style_copy(gtk_widget_get_style(widget));
+               slot = &style->bg[GTK_STATE_NORMAL];
+
+               slot->red = color->red;
+               slot->green = color->green;
+               slot->blue = color->blue;
                }
-
-       if (pr->vis_width < pr->window_width)
-               {
-               if (pr->x_offset > 0 &&
-                   pr_clip_region(x, y, w, h,
-                                  0, 0,
-                                  pr->x_offset, pr->window_height,
-                                  &rx, &ry, &rw, &rh))
-                       {
-                       gdk_window_clear_area(box->window, rx, ry, rw, rh);
-                       pr_overlay_draw(pr, rx, ry, rw, rh, NULL);
-                       }
-               if (pr->window_width - pr->vis_width - pr->x_offset > 0 &&
-                   pr_clip_region(x, y, w, h,
-                                  pr->x_offset + pr->vis_width, 0,
-                                  pr->window_width - pr->vis_width - pr->x_offset, pr->window_height,
-                                  &rx, &ry, &rw, &rh))
-                       {
-                       gdk_window_clear_area(box->window, rx, ry, rw, rh);
-                       pr_overlay_draw(pr, rx, ry, rw, rh, NULL);
-                       }
-               }
-       if (pr->vis_height < pr->window_height)
-               {
-               if (pr->y_offset > 0 &&
-                   pr_clip_region(x, y, w, h,
-                                  pr->x_offset, 0,
-                                  pr->vis_width, pr->y_offset,
-                                  &rx, &ry, &rw, &rh))
-                       {
-                       gdk_window_clear_area(box->window, rx, ry, rw, rh);
-                       pr_overlay_draw(pr, rx, ry, rw, rh, NULL);
-                       }
-               if (pr->window_height - pr->vis_height - pr->y_offset > 0 &&
-                   pr_clip_region(x, y, w, h,
-                                  pr->x_offset, pr->y_offset + pr->vis_height,
-                                  pr->vis_width, pr->window_height - pr->vis_height - pr->y_offset,
-                                  &rx, &ry, &rw, &rh))
-                       {
-                       gdk_window_clear_area(box->window, rx, ry, rw, rh);
-                       pr_overlay_draw(pr, rx, ry, rw, rh, NULL);
-                       }
-               }
-}
-
-static void pr_border_clear(PixbufRenderer *pr)
-{
-       pr_border_draw(pr, 0, 0, pr->window_width, pr->window_height);
-}
-
-void pixbuf_renderer_set_color(PixbufRenderer *pr, GdkColor *color)
-{
-       GtkStyle *style;
-       GtkWidget *widget;
-
-       g_return_if_fail(IS_PIXBUF_RENDERER(pr));
-
-       widget = GTK_WIDGET(pr);
-
-       if (color) {
-               GdkColor *slot;
-
-               style = gtk_style_copy(gtk_widget_get_style(widget));
-               slot = &style->bg[GTK_STATE_NORMAL];
-
-               slot->red = color->red;
-               slot->green = color->green;
-               slot->blue = color->blue;
-               }
-       else {
-               style = gtk_style_copy(gtk_widget_get_default_style());
-       }
+       else {
+               style = gtk_style_copy(gtk_widget_get_default_style());
+       }
 
        gtk_widget_set_style(widget, style);
 
-       if (GTK_WIDGET_VISIBLE(widget)) pr_border_clear(pr);
+       pr->renderer->update_viewport(pr->renderer);
+       if (pr->renderer2) pr->renderer2->update_viewport(pr->renderer2);
 }
 
-
 /*
  *-------------------------------------------------------------------
  * source tiles
@@ -1395,21 +956,25 @@ static void pr_source_tile_unset(PixbufRenderer *pr)
        pr->source_tiles_enabled = FALSE;
 }
 
-static gint pr_source_tile_visible(PixbufRenderer *pr, SourceTile *st)
+static gboolean pr_source_tile_visible(PixbufRenderer *pr, SourceTile *st)
 {
        gint x1, y1, x2, y2;
 
        if (!st) return FALSE;
 
-       x1 = (pr->x_scroll / pr->tile_width) * pr->tile_width;
-       y1 = (pr->y_scroll / pr->tile_height) * pr->tile_height;
-       x2 = ((pr->x_scroll + pr->vis_width) / pr->tile_width) * pr->tile_width + pr->tile_width;
-       y2 = ((pr->y_scroll + pr->vis_height) / pr->tile_height) * pr->tile_height + pr->tile_height;
+//     x1 = ROUND_DOWN(pr->x_scroll, pr->tile_width);
+//     y1 = ROUND_DOWN(pr->y_scroll, pr->tile_height);
+//     x2 = ROUND_UP(pr->x_scroll + pr->vis_width, pr->tile_width);
+//     y2 = ROUND_UP(pr->y_scroll + pr->vis_height, pr->tile_height);
+       x1 = pr->x_scroll;
+       y1 = pr->y_scroll;
+       x2 = pr->x_scroll + pr->vis_width;
+       y2 = pr->y_scroll + pr->vis_height;
 
-       return !((double)st->x * pr->scale > (double)x2 ||
-                (double)(st->x + pr->source_tile_width) * pr->scale < (double)x1 ||
-                (double)st->y * pr->scale > (double)y2 ||
-                (double)(st->y + pr->source_tile_height) * pr->scale < (double)y1);
+       return !((gdouble)st->x * pr->scale > (gdouble)x2 ||
+                (gdouble)(st->x + pr->source_tile_width) * pr->scale < (gdouble)x1 ||
+                (gdouble)st->y * pr->scale > (gdouble)y2 ||
+                (gdouble)(st->y + pr->source_tile_height) * pr->scale < (gdouble)y1);
 }
 
 static SourceTile *pr_source_tile_new(PixbufRenderer *pr, gint x, gint y)
@@ -1466,8 +1031,8 @@ static SourceTile *pr_source_tile_new(PixbufRenderer *pr, gint x, gint y)
                                            pr->source_tile_width, pr->source_tile_height);
                }
 
-       st->x = (x / pr->source_tile_width) * pr->source_tile_width;
-       st->y = (y / pr->source_tile_height) * pr->source_tile_height;
+       st->x = ROUND_DOWN(x, pr->source_tile_width);
+       st->y = ROUND_DOWN(y, pr->source_tile_height);
        st->blank = TRUE;
 
        pr->source_tiles = g_list_prepend(pr->source_tiles, st);
@@ -1489,9 +1054,10 @@ static SourceTile *pr_source_tile_request(PixbufRenderer *pr, gint x, gint y)
                st->blank = FALSE;
                }
 
-       pr_tile_invalidate_region(pr, st->x * pr->scale, st->y * pr->scale,
+       pr->renderer->invalidate_region(pr->renderer, st->x * pr->scale, st->y * pr->scale,
+                                 pr->source_tile_width * pr->scale, pr->source_tile_height * pr->scale);
+       if (pr->renderer2) pr->renderer2->invalidate_region(pr->renderer2, st->x * pr->scale, st->y * pr->scale,
                                  pr->source_tile_width * pr->scale, pr->source_tile_height * pr->scale);
-
        return st;
 }
 
@@ -1521,7 +1087,7 @@ static SourceTile *pr_source_tile_find(PixbufRenderer *pr, gint x, gint y)
        return NULL;
 }
 
-static GList *pr_source_tile_compute_region(PixbufRenderer *pr, gint x, gint y, gint w, gint h, gint request)
+GList *pr_source_tile_compute_region(PixbufRenderer *pr, gint x, gint y, gint w, gint h, gboolean request)
 {
        gint x1, y1;
        GList *list = NULL;
@@ -1532,8 +1098,8 @@ static GList *pr_source_tile_compute_region(PixbufRenderer *pr, gint x, gint y,
        if (w > pr->image_width) w = pr->image_width;
        if (h > pr->image_height) h = pr->image_height;
 
-       sx = (x / pr->source_tile_width) * pr->source_tile_width;
-       sy = (y / pr->source_tile_height) * pr->source_tile_height;
+       sx = ROUND_DOWN(x, pr->source_tile_width);
+       sy = ROUND_DOWN(y, pr->source_tile_height);
 
        for (x1 = sx; x1 < x + w; x1+= pr->source_tile_width)
                {
@@ -1576,130 +1142,16 @@ static void pr_source_tile_changed(PixbufRenderer *pr, gint x, gint y, gint widt
                        if (pr->func_tile_request &&
                            pr->func_tile_request(pr, rx, ry, rw, rh, pixbuf, pr->func_tile_data))
                                {
-                               pr_tile_invalidate_region(pr, rx * pr->scale, ry * pr->scale,
+                                       pr->renderer->invalidate_region(pr->renderer, rx * pr->scale, ry * pr->scale,
                                                              rw * pr->scale, rh * pr->scale);
+                                       if (pr->renderer2) pr->renderer2->invalidate_region(pr->renderer2, rx * pr->scale, ry * pr->scale,
+                                                               rw * pr->scale, rh * pr->scale);
                                }
                        g_object_unref(pixbuf);
                        }
                }
 }
 
-static gint pr_source_tile_render(PixbufRenderer *pr, ImageTile *it,
-                                 gint x, gint y, gint w, gint h,
-                                 gint new_data, gint fast)
-{
-       GtkWidget *box;
-       GList *list;
-       GList *work;
-       gint draw = FALSE;
-
-       box = GTK_WIDGET(pr);
-
-       if (pr->zoom == 1.0 || pr->scale == 1.0)
-               {
-               list = pr_source_tile_compute_region(pr, it->x + x, it->y + y, w, h, TRUE);
-               work = list;
-               while (work)
-                       {
-                       SourceTile *st;
-                       gint rx, ry, rw, rh;
-
-                       st = work->data;
-                       work = work->next;
-
-                       if (pr_clip_region(st->x, st->y, pr->source_tile_width, pr->source_tile_height,
-                                          it->x + x, it->y + y, w, h,
-                                          &rx, &ry, &rw, &rh))
-                               {
-                               if (st->blank)
-                                       {
-                                       gdk_draw_rectangle(it->pixmap, box->style->black_gc, TRUE,
-                                                          rx - st->x, ry - st->y, rw, rh);
-                                       }
-                               else /* (pr->zoom == 1.0 || pr->scale == 1.0) */
-                                       {
-                                       gdk_draw_pixbuf(it->pixmap,
-                                                       box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                                       st->pixbuf,
-                                                       rx - st->x, ry - st->y,
-                                                       rx - it->x, ry - it->y,
-                                                       rw, rh,
-                                                       pr->dither_quality, rx, ry);
-                                       }
-                               }
-                       }
-               }
-       else
-               {
-               double scale_x, scale_y;
-               gint sx, sy, sw, sh;
-
-               if (pr->image_width == 0 || pr->image_height == 0) return FALSE;
-               scale_x = (double)pr->width / pr->image_width;
-               scale_y = (double)pr->height / pr->image_height;
-
-               sx = (double)(it->x + x) / scale_x;
-               sy = (double)(it->y + y) / scale_y;
-               sw = (double)w / scale_x;
-               sh = (double)h / scale_y;
-
-               if (pr->width < PR_MIN_SCALE_SIZE || pr->height < PR_MIN_SCALE_SIZE) fast = TRUE;
-
-#if 0
-               /* draws red over draw region, to check for leaks (regions not filled) */
-               pixbuf_set_rect_fill(it->pixbuf, x, y, w, h, 255, 0, 0, 255);
-#endif
-
-               list = pr_source_tile_compute_region(pr, sx, sy, sw, sh, TRUE);
-               work = list;
-               while (work)
-                       {
-                       SourceTile *st;
-                       gint rx, ry, rw, rh;
-                       gint stx, sty, stw, sth;
-
-                       st = work->data;
-                       work = work->next;
-
-                       stx = floor((double)st->x * scale_x);
-                       sty = floor((double)st->y * scale_y);
-                       stw = ceil ((double)(st->x + pr->source_tile_width) * scale_x) - stx;
-                       sth = ceil ((double)(st->y + pr->source_tile_height) * scale_y) - sty;
-
-                       if (pr_clip_region(stx, sty, stw, sth,
-                                          it->x + x, it->y + y, w, h,
-                                          &rx, &ry, &rw, &rh))
-                               {
-                               if (st->blank)
-                                       {
-                                       gdk_draw_rectangle(it->pixmap, box->style->black_gc, TRUE,
-                                                          rx - st->x, ry - st->y, rw, rh);
-                                       }
-                               else
-                                       {
-                                       double offset_x;
-                                       double offset_y;
-
-                                       /* may need to use unfloored stx,sty values here */
-                                       offset_x = (double)(stx - it->x);
-                                       offset_y = (double)(sty - it->y);
-
-                                       gdk_pixbuf_scale(st->pixbuf, it->pixbuf, rx - it->x, ry - it->y, rw, rh,
-                                                (double) 0.0 + offset_x,
-                                                (double) 0.0 + offset_y,
-                                                scale_x, scale_y,
-                                                (fast) ? GDK_INTERP_NEAREST : pr->zoom_quality);
-                                       draw = TRUE;
-                                       }
-                               }
-                       }
-               }
-
-       g_list_free(list);
-
-       return draw;
-}
-
 void pixbuf_renderer_set_tiles(PixbufRenderer *pr, gint width, gint height,
                               gint tile_width, gint tile_height, gint cache_size,
                               PixbufRendererTileRequestFunc func_request,
@@ -1731,8 +1183,8 @@ void pixbuf_renderer_set_tiles(PixbufRenderer *pr, gint width, gint height,
        pr->func_tile_dispose = func_dispose;
        pr->func_tile_data = user_data;
 
-       pr_zoom_sync(pr, zoom, TRUE, TRUE, FALSE, 0, 0);
-       pr_redraw(pr, TRUE);
+       pr_stereo_temp_disable(pr, TRUE);
+       pr_zoom_sync(pr, zoom, PR_ZOOM_FORCE | PR_ZOOM_NEW, 0, 0);
 }
 
 void pixbuf_renderer_set_tiles_size(PixbufRenderer *pr, gint width, gint height)
@@ -1746,7 +1198,7 @@ void pixbuf_renderer_set_tiles_size(PixbufRenderer *pr, gint width, gint height)
        pr->image_width = width;
        pr->image_height = height;
 
-       pr_zoom_sync(pr, pr->zoom, TRUE, FALSE, FALSE, 0, 0);
+       pr_zoom_sync(pr, pr->zoom, PR_ZOOM_FORCE, 0, 0);
 }
 
 gint pixbuf_renderer_get_tiles(PixbufRenderer *pr)
@@ -1757,7 +1209,7 @@ gint pixbuf_renderer_get_tiles(PixbufRenderer *pr)
 }
 
 static void pr_zoom_adjust_real(PixbufRenderer *pr, gdouble increment,
-                               gint center_point, gint x, gint y)
+                               PrZoomFlags flags, gint x, gint y)
 {
        gdouble zoom = pr->zoom;
 
@@ -1798,270 +1250,77 @@ static void pr_zoom_adjust_real(PixbufRenderer *pr, gdouble increment,
                        }
                }
 
-       pr_zoom_sync(pr, zoom, FALSE, FALSE, center_point, x, y);
+       pr_zoom_sync(pr, zoom, flags, x, y);
 }
 
+
 /*
  *-------------------------------------------------------------------
- * display tiles
+ * signal emission
  *-------------------------------------------------------------------
  */
 
-static ImageTile *pr_tile_new(gint x, gint y, gint width, gint height)
-{
-       ImageTile *it;
-
-       it = g_new0(ImageTile, 1);
-
-       it->x = x;
-       it->y = y;
-       it->w = width;
-       it->h = height;
-
-       it->render_done = TILE_RENDER_NONE;
-
-       return it;
-}
-
-static void pr_tile_free(ImageTile *it)
-{
-       if (!it) return;
-
-       if (it->pixbuf) gdk_pixbuf_unref(it->pixbuf);
-       if (it->pixmap) g_object_unref(it->pixmap);
-
-       g_free(it);
-}
-
-static void pr_tile_free_all(PixbufRenderer *pr)
+static void pr_update_signal(PixbufRenderer *pr)
 {
-       GList *work;
-
-       work = pr->tiles;
-       while (work)
-               {
-               ImageTile *it;
-
-               it = work->data;
-               work = work->next;
-
-               pr_tile_free(it);
-               }
-
-       g_list_free(pr->tiles);
-       pr->tiles = NULL;
-       pr->tile_cache_size = 0;
+       DEBUG_1("%s pixbuf renderer updated - started drawing %p, img: %dx%d", get_exec_time(), pr, pr->image_width, pr->image_height);
+       pr->debug_updated = TRUE;
 }
 
-static ImageTile *pr_tile_add(PixbufRenderer *pr, gint x, gint y)
+static void pr_zoom_signal(PixbufRenderer *pr)
 {
-       ImageTile *it;
-
-       it = pr_tile_new(x, y, pr->tile_width, pr->tile_height);
-
-       if (it->x + it->w > pr->width) it->w = pr->width - it->x;
-       if (it->y + it->h > pr->height) it->h = pr->height - it->y;
-
-       pr->tiles = g_list_prepend(pr->tiles, it);
-       pr->tile_cache_size += it->size;
-
-       return it;
+       g_signal_emit(pr, signals[SIGNAL_ZOOM], 0, pr->zoom);
 }
 
-static void pr_tile_remove(PixbufRenderer *pr, ImageTile *it)
+static void pr_clicked_signal(PixbufRenderer *pr, GdkEventButton *bevent)
 {
-       if (it->qd)
-               {
-               QueueData *qd = it->qd;
-
-               it->qd = NULL;
-               pr->draw_queue = g_list_remove(pr->draw_queue, qd);
-               g_free(qd);
-               }
-
-       if (it->qd2)
-               {
-               QueueData *qd = it->qd2;
-
-               it->qd2 = NULL;
-               pr->draw_queue_2pass = g_list_remove(pr->draw_queue_2pass, qd);
-               g_free(qd);
-               }
-
-       pr->tiles = g_list_remove(pr->tiles, it);
-       pr->tile_cache_size -= it->size;
-
-       pr_tile_free(it);
+       g_signal_emit(pr, signals[SIGNAL_CLICKED], 0, bevent);
 }
 
-static void pr_tile_free_space(PixbufRenderer *pr, guint space, ImageTile *it)
+static void pr_scroll_notify_signal(PixbufRenderer *pr)
 {
-       GList *work;
-       gint tile_max;
-
-       work = g_list_last(pr->tiles);
-
-       if (pr->source_tiles_enabled && pr->scale < 1.0)
-               {
-               gint tiles;
-
-               tiles = (pr->vis_width / pr->tile_width + 1) * (pr->vis_height / pr->tile_height + 1);
-               tile_max = MAX(tiles * pr->tile_width * pr->tile_height * 3,
-                              (gint)((double)pr->tile_cache_max * 1048576.0 * pr->scale));
-               }
-       else
-               {
-               tile_max = pr->tile_cache_max * 1048576;
-               }
-
-       while (work && pr->tile_cache_size + space > tile_max)
-               {
-               ImageTile *needle;
-
-               needle = work->data;
-               work = work->prev;
-               if (needle != it &&
-                   ((!needle->qd && !needle->qd2) || !pr_tile_is_visible(pr, needle))) pr_tile_remove(pr, needle);
-               }
+       g_signal_emit(pr, signals[SIGNAL_SCROLL_NOTIFY], 0);
 }
 
-static void pr_tile_invalidate_all(PixbufRenderer *pr)
+void pr_render_complete_signal(PixbufRenderer *pr)
 {
-       GList *work;
-
-       work = pr->tiles;
-       while (work)
+       if (!pr->complete)
                {
-               ImageTile *it;
-
-               it = work->data;
-               work = work->next;
-
-               it->render_done = TILE_RENDER_NONE;
-               it->render_todo = TILE_RENDER_ALL;
-               it->blank = FALSE;
-
-               it->w = MIN(pr->tile_width, pr->width - it->x);
-               it->h = MIN(pr->tile_height, pr->height - it->y);
+               g_signal_emit(pr, signals[SIGNAL_RENDER_COMPLETE], 0);
+               g_object_set(G_OBJECT(pr), "complete", TRUE, NULL);
                }
-}
-
-static void pr_tile_invalidate_region(PixbufRenderer *pr, gint x, gint y, gint w, gint h)
-{
-       gint x1, x2;
-       gint y1, y2;
-       GList *work;
-
-       x1 = (gint)floor(x / pr->tile_width) * pr->tile_width;
-       x2 = (gint)ceil((x + w) / pr->tile_width) * pr->tile_width;
-
-       y1 = (gint)floor(y / pr->tile_height) * pr->tile_height;
-       y2 = (gint)ceil((y + h) / pr->tile_height) * pr->tile_height;
-
-       work = pr->tiles;
-       while (work)
+       if (pr->debug_updated)
                {
-               ImageTile *it;
-
-               it = work->data;
-               work = work->next;
-
-               if (it->x < x2 && it->x + it->w > x1 &&
-                   it->y < y2 && it->y + it->h > y1)
-                       {
-                       it->render_done = TILE_RENDER_NONE;
-                       it->render_todo = TILE_RENDER_ALL;
-                       }
+               DEBUG_1("%s pixbuf renderer done %p", get_exec_time(), pr);
+               pr->debug_updated = FALSE;
                }
 }
 
-static ImageTile *pr_tile_get(PixbufRenderer *pr, gint x, gint y, gint only_existing)
+static void pr_drag_signal(PixbufRenderer *pr, GdkEventButton *bevent)
 {
-       GList *work;
-
-       work = pr->tiles;
-       while (work)
-               {
-               ImageTile *it;
-
-               it = work->data;
-               if (it->x == x && it->y == y)
-                       {
-                       pr->tiles = g_list_delete_link(pr->tiles, work);
-                       pr->tiles = g_list_prepend(pr->tiles, it);
-                       return it;
-                       }
-
-               work = work->next;
-               }
-
-       if (only_existing) return NULL;
-
-       return pr_tile_add(pr, x, y);
+       g_signal_emit(pr, signals[SIGNAL_DRAG], 0, bevent);
 }
 
-static void pr_tile_prepare(PixbufRenderer *pr, ImageTile *it)
+static void pr_update_pixel_signal(PixbufRenderer *pr)
 {
-       if (!it->pixmap)
-               {
-               GdkPixmap *pixmap;
-               guint size;
-
-               pixmap = gdk_pixmap_new(((GtkWidget *)pr)->window, pr->tile_width, pr->tile_height, -1);
-
-               size = pixmap_calc_size(pixmap);
-               pr_tile_free_space(pr, size, it);
-
-               it->pixmap = pixmap;
-               it->size += size;
-               pr->tile_cache_size += size;
-               }
-       
-       if ((pr->zoom != 1.0 || pr->source_tiles_enabled || (pr->pixbuf && gdk_pixbuf_get_has_alpha(pr->pixbuf)) || 
-            pr->orientation != EXIF_ORIENTATION_TOP_LEFT || pr->func_post_process) && !it->pixbuf)
-               {
-               GdkPixbuf *pixbuf;
-               guint size;
-#if 0
-/* I don't think that we need a pixbuf with alpha channel here */
-               if (pr->pixbuf)
-                       {
-                       pixbuf = gdk_pixbuf_new(gdk_pixbuf_get_colorspace(pr->pixbuf),
-                                               gdk_pixbuf_get_has_alpha(pr->pixbuf),
-                                               gdk_pixbuf_get_bits_per_sample(pr->pixbuf),
-                                               pr->tile_width, pr->tile_height);
-                       }
-               else
-#endif
-                       {
-                       pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, pr->tile_width, pr->tile_height);
-                       }
-
-               size = gdk_pixbuf_get_rowstride(pixbuf) * pr->tile_height;
-               pr_tile_free_space(pr, size, it);
-
-               it->pixbuf = pixbuf;
-               it->size += size;
-               pr->tile_cache_size += size;
-               }
+       g_signal_emit(pr, signals[SIGNAL_UPDATE_PIXEL], 0);
 }
 
 /*
  *-------------------------------------------------------------------
- * drawing
+ * sync and clamp
  *-------------------------------------------------------------------
  */
 
-static void pr_tile_coords_map_orientation(PixbufRenderer *pr,
-                                     double tile_x, double tile_y, /* coordinates of the tile */
-                                    gint image_w, gint image_h, 
-                                    double tile_w, double tile_h,
-                                    double *res_x, double *res_y)
+
+void pr_tile_coords_map_orientation(gint orientation,
+                                    gdouble tile_x, gdouble tile_y, /* coordinates of the tile */
+                                    gdouble image_w, gdouble image_h,
+                                    gdouble tile_w, gdouble tile_h,
+                                    gdouble *res_x, gdouble *res_y)
 {
        *res_x = tile_x;
        *res_y = tile_y;
-       switch (pr->orientation)
+       switch (orientation)
                {
                case EXIF_ORIENTATION_TOP_LEFT:
                        /* normal -- nothing to do */
@@ -2101,10 +1360,10 @@ static void pr_tile_coords_map_orientation(PixbufRenderer *pr,
                        /* The other values are out of range */
                        break;
                }
-//     printf("tile coord y:%f, ih:%d, th:%f ry:%f\n", tile_y, image_h, tile_h, *res_x); 
-} 
+//     log_printf("tile coord y:%f, ih:%d, th:%f ry:%f\n", tile_y, image_h, tile_h, *res_x);
+}
 
-static void pr_tile_region_map_orientation(PixbufRenderer *pr,
+void pr_tile_region_map_orientation(gint orientation,
                                     gint area_x, gint area_y, /* coordinates of the area inside tile */
                                     gint tile_w, gint tile_h,
                                     gint area_w, gint area_h,
@@ -2116,7 +1375,7 @@ static void pr_tile_region_map_orientation(PixbufRenderer *pr,
        *res_w = area_w;
        *res_h = area_h;
 
-       switch (pr->orientation)
+       switch (orientation)
                {
                case EXIF_ORIENTATION_TOP_LEFT:
                        /* normal -- nothing to do */
@@ -2164,10 +1423,10 @@ static void pr_tile_region_map_orientation(PixbufRenderer *pr,
                        /* The other values are out of range */
                        break;
                }
-//     printf("inside y:%d, th:%d, ah:%d ry:%d\n", area_y, tile_h, area_h, *res_x); 
-} 
+//     log_printf("inside y:%d, th:%d, ah:%d ry:%d\n", area_y, tile_h, area_h, *res_x);
+}
 
-static void pr_coords_map_orientation_reverse(PixbufRenderer *pr,
+void pr_coords_map_orientation_reverse(gint orientation,
                                     gint area_x, gint area_y,
                                     gint tile_w, gint tile_h,
                                     gint area_w, gint area_h,
@@ -2179,7 +1438,7 @@ static void pr_coords_map_orientation_reverse(PixbufRenderer *pr,
        *res_w = area_w;
        *res_h = area_h;
 
-       switch (pr->orientation)
+       switch (orientation)
                {
                case EXIF_ORIENTATION_TOP_LEFT:
                        /* normal -- nothing to do */
@@ -2227,820 +1486,41 @@ static void pr_coords_map_orientation_reverse(PixbufRenderer *pr,
                        /* The other values are out of range */
                        break;
                }
-} 
-
-
-static GdkPixbuf *pr_get_spare_tile(PixbufRenderer *pr)
-{
-       if (!pr->spare_tile) pr->spare_tile = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, pr->tile_width, pr->tile_height);
-       return pr->spare_tile;
 }
 
-#define COLOR_BYTES 3  /* rgb */
 
-static void pr_tile_rotate_90_clockwise(PixbufRenderer *pr, GdkPixbuf **tile, gint x, gint y, gint w, gint h)
+
+static void pixbuf_renderer_sync_scroll_center(PixbufRenderer *pr)
 {
-       GdkPixbuf *src = *tile;
-       GdkPixbuf *dest;
-       gint srs, drs;
-       guchar *s_pix, *d_pix;
-       guchar *sp, *dp;
-       guchar *ip, *spi, *dpi;
-       gint i, j, n;
-       gint tw = pr->tile_width;
-               
-       srs = gdk_pixbuf_get_rowstride(src);
-       s_pix = gdk_pixbuf_get_pixels(src);
-       spi = s_pix + (x * COLOR_BYTES);
+       gint src_x, src_y;
+       if (!pr->width || !pr->height) return;
 
-       dest = pr_get_spare_tile(pr);
-       drs = gdk_pixbuf_get_rowstride(dest);
-       d_pix = gdk_pixbuf_get_pixels(dest);
-       dpi = d_pix + (tw - 1) * COLOR_BYTES;
+       /*
+        * Update norm_center only if the image is bigger than the window.
+        * With this condition the stored center survives also a temporary display
+        * of the "broken image" icon.
+       */
 
-       for (i = y; i < y + h; i++)
+       if (pr->width > pr->viewport_width)
                {
-               sp = spi + (i * srs);
-               ip = dpi - (i * COLOR_BYTES);
-               for (j = x; j < x + w; j++)
-                       {
-                       dp = ip + (j * drs);
-                       for (n = 0; n < COLOR_BYTES; n++)
-                               *(dp++) = *(sp++);
-                       }
+               src_x = pr->x_scroll + pr->vis_width / 2;
+               pr->norm_center_x = (gdouble)src_x / pr->width;
                }
        
-       pr->spare_tile = src;
-       *tile = dest;
-}
-
-static void pr_tile_rotate_90_counter_clockwise(PixbufRenderer *pr, GdkPixbuf **tile, gint x, gint y, gint w, gint h)
-{
-       GdkPixbuf *src = *tile;
-       GdkPixbuf *dest;
-       gint srs, drs;
-       guchar *s_pix, *d_pix;
-       guchar *sp, *dp;
-       guchar *ip, *spi, *dpi;
-       gint i, j, n;
-       gint th = pr->tile_height;
-       
-       srs = gdk_pixbuf_get_rowstride(src);
-       s_pix = gdk_pixbuf_get_pixels(src);
-       spi = s_pix + (x * COLOR_BYTES);
-
-       dest = pr_get_spare_tile(pr);
-       drs = gdk_pixbuf_get_rowstride(dest);
-       d_pix = gdk_pixbuf_get_pixels(dest);
-       dpi = d_pix + (th - 1) * drs;
-
-       for (i = y; i < y + h; i++)
+       if (pr->height > pr->viewport_height)
                {
-               sp = spi + (i * srs);
-               ip = dpi + (i * COLOR_BYTES);
-               for (j = x; j < x + w; j++)
-                       {
-                       dp = ip - (j * drs);
-                       for (n = 0; n < COLOR_BYTES; n++)
-                               *(dp++) = *(sp++);
-                       }
+               src_y = pr->y_scroll + pr->vis_height / 2;
+               pr->norm_center_y = (gdouble)src_y / pr->height;
                }
-       
-       pr->spare_tile = src;
-       *tile = dest;
 }
 
-static void pr_tile_mirror_only(PixbufRenderer *pr, GdkPixbuf **tile, gint x, gint y, gint w, gint h)
-{
-       GdkPixbuf *src = *tile;
-       GdkPixbuf *dest;
-       gint srs, drs;
-       guchar *s_pix, *d_pix;
-       guchar *sp, *dp;
-       guchar *spi, *dpi;
-       gint i, j, n;
-
-       gint tw = pr->tile_width;
-
-       srs = gdk_pixbuf_get_rowstride(src);
-       s_pix = gdk_pixbuf_get_pixels(src);
-       spi = s_pix + (x * COLOR_BYTES);
 
-       dest = pr_get_spare_tile(pr);
-       drs = gdk_pixbuf_get_rowstride(dest);
-       d_pix = gdk_pixbuf_get_pixels(dest);
-       dpi =  d_pix + (tw - x - 1) * COLOR_BYTES;
+static gboolean pr_scroll_clamp(PixbufRenderer *pr)
+{
+       gint old_xs;
+       gint old_ys;
 
-       for (i = y; i < y + h; i++)
-               {
-               sp = spi + (i * srs);
-               dp = dpi + (i * drs);
-               for (j = 0; j < w; j++)
-                       {
-                       for (n = 0; n < COLOR_BYTES; n++)
-                               dp[n] = *(sp++);
-                       dp -= COLOR_BYTES;
-                       }
-               }
-
-       pr->spare_tile = src;
-       *tile = dest;
-}
-
-static void pr_tile_mirror_and_flip(PixbufRenderer *pr, GdkPixbuf **tile, gint x, gint y, gint w, gint h)
-{
-       GdkPixbuf *src = *tile;
-       GdkPixbuf *dest;
-       gint srs, drs;
-       guchar *s_pix, *d_pix;
-       guchar *sp, *dp;
-       guchar *spi, *dpi;
-       gint i, j, n;
-       gint tw = pr->tile_width;
-       gint th = pr->tile_height;
-
-       srs = gdk_pixbuf_get_rowstride(src);
-       s_pix = gdk_pixbuf_get_pixels(src);
-       spi = s_pix + (x * COLOR_BYTES);
-
-       dest = pr_get_spare_tile(pr);
-       drs = gdk_pixbuf_get_rowstride(dest);
-       d_pix = gdk_pixbuf_get_pixels(dest);
-       dpi = d_pix + (th - 1) * drs + (tw - 1) * COLOR_BYTES;
-
-       for (i = y; i < y + h; i++)
-               {
-               sp = s_pix + (i * srs) + (x * COLOR_BYTES);
-               dp = dpi - (i * drs) - (x * COLOR_BYTES);
-               for (j = 0; j < w; j++)
-                       {
-                       for (n = 0; n < COLOR_BYTES; n++)
-                               dp[n] = *(sp++);
-                       dp -= COLOR_BYTES;
-                       }
-               }
-       
-       pr->spare_tile = src;
-       *tile = dest;
-}
-
-static void pr_tile_flip_only(PixbufRenderer *pr, GdkPixbuf **tile, gint x, gint y, gint w, gint h)
-{
-       GdkPixbuf *src = *tile;
-       GdkPixbuf *dest;
-       gint srs, drs;
-       guchar *s_pix, *d_pix;
-       guchar *sp, *dp;
-       guchar *spi, *dpi;
-       gint i, j, n;
-       gint th = pr->tile_height;
-
-       srs = gdk_pixbuf_get_rowstride(src);
-       s_pix = gdk_pixbuf_get_pixels(src);
-       spi = s_pix + (x * COLOR_BYTES);
-
-       dest = pr_get_spare_tile(pr);
-       drs = gdk_pixbuf_get_rowstride(dest);
-       d_pix = gdk_pixbuf_get_pixels(dest);
-       dpi = d_pix + (th - 1) * drs + (x * COLOR_BYTES);
-
-       for (i = y; i < y + h; i++)
-               {
-               sp = spi + (i * srs);
-               dp = dpi - (i * drs);
-               for (j = 0; j < w; j++)
-                       {
-                       for (n = 0; n < COLOR_BYTES; n++)
-                               *(dp++) = *(sp++);
-                       }
-               }
-
-       pr->spare_tile = src;
-       *tile = dest;
-}
-
-static void pr_tile_apply_orientation(PixbufRenderer *pr, GdkPixbuf **pixbuf, gint x, gint y, gint w, gint h)
-{
-       switch (pr->orientation)
-               {
-               case EXIF_ORIENTATION_TOP_LEFT:
-                       /* normal -- nothing to do */
-                       break;
-               case EXIF_ORIENTATION_TOP_RIGHT:
-                       /* mirrored */
-                       {
-                               pr_tile_mirror_only(pr, pixbuf, x, y, w, h);
-                       }
-                       break;
-               case EXIF_ORIENTATION_BOTTOM_RIGHT:
-                       /* upside down */
-                       {
-                               pr_tile_mirror_and_flip(pr, pixbuf, x, y, w, h);
-                       }
-                       break;
-               case EXIF_ORIENTATION_BOTTOM_LEFT:
-                       /* flipped */
-                       {
-                               pr_tile_flip_only(pr, pixbuf, x, y, w, h);
-                       }
-                       break;
-               case EXIF_ORIENTATION_LEFT_TOP:
-                       {
-                               pr_tile_flip_only(pr, pixbuf, x, y, w, h);
-                               pr_tile_rotate_90_clockwise(pr, pixbuf, x, pr->tile_height - y - h, w, h);
-                       }
-                       break;
-               case EXIF_ORIENTATION_RIGHT_TOP:
-                       /* rotated -90 (270) */
-                       {
-                               pr_tile_rotate_90_clockwise(pr, pixbuf, x, y, w, h);
-                       }
-                       break;
-               case EXIF_ORIENTATION_RIGHT_BOTTOM:
-                       {
-                               pr_tile_flip_only(pr, pixbuf, x, y, w, h);
-                               pr_tile_rotate_90_counter_clockwise(pr, pixbuf, x, pr->tile_height - y - h, w, h);
-                       }
-                       break;
-               case EXIF_ORIENTATION_LEFT_BOTTOM:
-                       /* rotated 90 */
-                       {
-                               pr_tile_rotate_90_counter_clockwise(pr, pixbuf, x, y, w, h);
-                       }
-                       break;
-               default:
-                       /* The other values are out of range */
-                       break;
-               }
-}
-
-
-static void pr_tile_render(PixbufRenderer *pr, ImageTile *it,
-                          gint x, gint y, gint w, gint h,
-                          gint new_data, gint fast)
-{
-       GtkWidget *box;
-       gint has_alpha;
-       gint draw = FALSE;
-
-       if (it->render_todo == TILE_RENDER_NONE && it->pixmap && !new_data) return;
-
-       if (it->render_done != TILE_RENDER_ALL)
-               {
-               x = 0;
-               y = 0;
-               w = it->w;
-               h = it->h;
-               if (!fast) it->render_done = TILE_RENDER_ALL;
-               }
-       else if (it->render_todo != TILE_RENDER_AREA)
-               {
-               if (!fast) it->render_todo = TILE_RENDER_NONE;
-               return;
-               }
-
-       if (!fast) it->render_todo = TILE_RENDER_NONE;
-
-       if (new_data) it->blank = FALSE;
-
-       pr_tile_prepare(pr, it);
-       has_alpha = (pr->pixbuf && gdk_pixbuf_get_has_alpha(pr->pixbuf));
-
-       box = GTK_WIDGET(pr);
-
-       /* FIXME checker colors for alpha should be configurable,
-        * also should be drawn for blank = TRUE
-        */
-
-       if (it->blank)
-               {
-               /* no data, do fast rect fill */
-               gdk_draw_rectangle(it->pixmap, box->style->black_gc, TRUE,
-                                  0, 0, it->w, it->h);
-               }
-       else if (pr->source_tiles_enabled)
-               {
-               draw = pr_source_tile_render(pr, it, x, y, w, h, new_data, fast);
-               }
-       else if (pr->zoom == 1.0 || pr->scale == 1.0)
-               {
-
-               double src_x, src_y;
-               gint pb_x, pb_y;
-               gint pb_w, pb_h;
-               pr_tile_coords_map_orientation(pr, it->x, it->y, 
-                                           pr->image_width, pr->image_height, 
-                                           pr->tile_width, pr->tile_height,
-                                           &src_x, &src_y);
-               pr_tile_region_map_orientation(pr, x, y, 
-                                           pr->tile_width, pr->tile_height,
-                                           w, h,
-                                           &pb_x, &pb_y,
-                                           &pb_w, &pb_h);
-
-               if (has_alpha)
-                       {
-                       gdk_pixbuf_composite_color(pr->pixbuf, it->pixbuf, pb_x, pb_y, pb_w, pb_h,
-                                        (double) 0.0 - src_x,
-                                        (double) 0.0 - src_y,
-                                        1.0, 1.0, GDK_INTERP_NEAREST,
-                                        255, it->x + pb_x, it->y + pb_y,
-                                        PR_ALPHA_CHECK_SIZE, PR_ALPHA_CHECK1, PR_ALPHA_CHECK2);
-                       pr_tile_apply_orientation(pr, &it->pixbuf, pb_x, pb_y, pb_w, pb_h);
-                       draw = TRUE;
-                       }
-               else
-                       {
-                       
-                       
-                       if (pr->orientation == EXIF_ORIENTATION_TOP_LEFT && !(pr->func_post_process && !(pr->post_process_slow && fast)))
-                               {
-                               /* faster, simple, base orientation, no postprocessing */
-                               gdk_draw_pixbuf(it->pixmap,
-                                               box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                                               pr->pixbuf,
-                                               it->x + x, it->y + y,
-                                               x, y,
-                                               w, h,
-                                               pr->dither_quality, it->x + x, it->y + y);
-                               }
-                       else
-                               {
-                               gdk_pixbuf_copy_area(pr->pixbuf,
-                                                    src_x + pb_x, src_y + pb_y,
-                                                    pb_w, pb_h,
-                                                    it->pixbuf,
-                                                    pb_x, pb_y);
-                               pr_tile_apply_orientation(pr, &it->pixbuf, pb_x, pb_y, pb_w, pb_h);
-                               draw = TRUE;
-                               }
-                       }
-               }
-       else
-               {
-               double scale_x, scale_y;
-               double src_x, src_y;
-               gint pb_x, pb_y;
-               gint pb_w, pb_h;
-
-               if (pr->image_width == 0 || pr->image_height == 0) return;
-
-               scale_x = (double)pr->width / pr->image_width;
-               scale_y = (double)pr->height / pr->image_height;
-
-               pr_tile_coords_map_orientation(pr, it->x / scale_x, it->y /scale_y , 
-                                           pr->image_width, pr->image_height, 
-                                           pr->tile_width / scale_x , pr->tile_height / scale_y,
-                                           &src_x, &src_y);
-               pr_tile_region_map_orientation(pr, x, y, 
-                                           pr->tile_width, pr->tile_height,
-                                           w, h,
-                                           &pb_x, &pb_y,
-                                           &pb_w, &pb_h);
-
-               /* HACK: The pixbuf scalers get kinda buggy(crash) with extremely
-                * small sizes for anything but GDK_INTERP_NEAREST
-                */
-               if (pr->width < PR_MIN_SCALE_SIZE || pr->height < PR_MIN_SCALE_SIZE) fast = TRUE;
-
-               if (!has_alpha)
-                       {
-                       gdk_pixbuf_scale(pr->pixbuf, it->pixbuf, pb_x, pb_y, pb_w, pb_h,
-                                        (double) 0.0 - src_x * scale_x,
-                                        (double) 0.0 - src_y * scale_y,
-                                        scale_x, scale_y,
-                                        (fast) ? GDK_INTERP_NEAREST : pr->zoom_quality);
-                       }
-               else
-                       {
-                       gdk_pixbuf_composite_color(pr->pixbuf, it->pixbuf, pb_x, pb_y, pb_w, pb_h,
-                                        (double) 0.0 - src_x * scale_x,
-                                        (double) 0.0 - src_y * scale_y,
-                                        scale_x, scale_y,
-                                        (fast) ? GDK_INTERP_NEAREST : pr->zoom_quality,
-                                        255, it->x + pb_x, it->y + pb_y,
-                                        PR_ALPHA_CHECK_SIZE, PR_ALPHA_CHECK1, PR_ALPHA_CHECK2);
-                       }
-               pr_tile_apply_orientation(pr, &it->pixbuf, pb_x, pb_y, pb_w, pb_h);
-               draw = TRUE;
-               }
-
-       if (draw && it->pixbuf && !it->blank)
-               {
-               
-               if (pr->func_post_process && !(pr->post_process_slow && fast))
-                       pr->func_post_process(pr, &it->pixbuf, x, y, w, h, pr->post_process_user_data);
-               
-               gdk_draw_pixbuf(it->pixmap,
-                               box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                               it->pixbuf,
-                               x, y,
-                               x, y,
-                               w, h,
-                               pr->dither_quality, it->x + x, it->y + y);
-               }
-
-#if 0
-       /* enable this line for debugging the edges of tiles */
-       gdk_draw_rectangle(it->pixmap, box->style->white_gc,
-                          FALSE, 0, 0, it->w, it->h);
-       gdk_draw_rectangle(it->pixmap, box->style->white_gc,
-                          FALSE, x, y, w, h);
-#endif
-}
-
-
-static void pr_tile_expose(PixbufRenderer *pr, ImageTile *it,
-                          gint x, gint y, gint w, gint h,
-                          gint new_data, gint fast)
-{
-       GtkWidget *box;
-
-       pr_tile_render(pr, it, x, y, w, h, new_data, fast);
-
-       box = GTK_WIDGET(pr);
-
-       gdk_draw_drawable(box->window, box->style->fg_gc[GTK_WIDGET_STATE(box)],
-                         it->pixmap, x, y,
-                         pr->x_offset + (it->x - pr->x_scroll) + x, pr->y_offset + (it->y - pr->y_scroll) + y, w, h);
-
-       if (pr->overlay_list)
-               {
-               pr_overlay_draw(pr, pr->x_offset + (it->x - pr->x_scroll) + x,
-                               pr->y_offset + (it->y - pr->y_scroll) + y,
-                               w, h,
-                               it);
-               }
-}
-
-
-static gint pr_tile_is_visible(PixbufRenderer *pr, ImageTile *it)
-{
-       return (it->x + it->w >= pr->x_scroll && it->x < pr->x_scroll + pr->vis_width &&
-               it->y + it->h >= pr->y_scroll && it->y < pr->y_scroll + pr->vis_height);
-}
-
-/*
- *-------------------------------------------------------------------
- * draw queue
- *-------------------------------------------------------------------
- */
-
-static gint pr_queue_draw_idle_cb(gpointer data)
-{
-       PixbufRenderer *pr = data;
-       QueueData *qd;
-       gint fast;
-
-       if ((!pr->pixbuf && !pr->source_tiles_enabled) ||
-           (!pr->draw_queue && !pr->draw_queue_2pass) ||
-           pr->draw_idle_id == -1)
-               {
-               pr_render_complete_signal(pr);
-
-               pr->draw_idle_id = -1;
-               return FALSE;
-               }
-
-       if (pr->draw_queue)
-               {
-               qd = pr->draw_queue->data;
-               fast = ((pr->zoom_2pass && pr->zoom_quality != GDK_INTERP_NEAREST && pr->scale != 1.0) || pr->post_process_slow);
-               }
-       else
-               {
-               if (pr->loading)
-                       {
-                       /* still loading, wait till done (also drops the higher priority) */
-
-                       pr->draw_idle_id = g_idle_add_full(G_PRIORITY_DEFAULT_IDLE,
-                                                          pr_queue_draw_idle_cb, pr, NULL);
-                       pr->draw_idle_high = FALSE;
-                       return FALSE;
-                       }
-
-               qd = pr->draw_queue_2pass->data;
-               fast = FALSE;
-               }
-
-       if (GTK_WIDGET_REALIZED(pr))
-               {
-               if (pr_tile_is_visible(pr, qd->it))
-                       {
-                       pr_tile_expose(pr, qd->it, qd->x, qd->y, qd->w, qd->h, qd->new_data, fast);
-                       }
-               else if (qd->new_data)
-                       {
-                       /* if new pixel data, and we already have a pixmap, update the tile */
-                       qd->it->blank = FALSE;
-                       if (qd->it->pixmap && qd->it->render_done == TILE_RENDER_ALL)
-                               {
-                               pr_tile_render(pr, qd->it, qd->x, qd->y, qd->w, qd->h, qd->new_data, fast);
-                               }
-                       }
-               }
-
-       if (pr->draw_queue)
-               {
-               qd->it->qd = NULL;
-               pr->draw_queue = g_list_remove(pr->draw_queue, qd);
-               if (fast)
-                       {
-                       if (qd->it->qd2)
-                               {
-                               pr_queue_merge(qd->it->qd2, qd);
-                               g_free(qd);
-                               }
-                       else
-                               {
-                               qd->it->qd2 = qd;
-                               pr->draw_queue_2pass = g_list_append(pr->draw_queue_2pass, qd);
-                               }
-                       }
-               else
-                       {
-                       g_free(qd);
-                       }
-               }
-       else
-               {
-               qd->it->qd2 = NULL;
-               pr->draw_queue_2pass = g_list_remove(pr->draw_queue_2pass, qd);
-               g_free(qd);
-               }
-
-       if (!pr->draw_queue && !pr->draw_queue_2pass)
-               {
-               pr_render_complete_signal(pr);
-
-               pr->draw_idle_id = -1;
-               return FALSE;
-               }
-
-       return TRUE;
-}
-
-static void pr_queue_list_free(GList *list)
-{
-       GList *work;
-
-       work = list;
-       while (work)
-               {
-               QueueData *qd;
-
-               qd = work->data;
-               work = work->next;
-
-               qd->it->qd = NULL;
-               qd->it->qd2 = NULL;
-               g_free(qd);
-               }
-
-       g_list_free(list);
-}
-
-static void pr_queue_clear(PixbufRenderer *pr)
-{
-       pr_queue_list_free(pr->draw_queue);
-       pr->draw_queue = NULL;
-
-       pr_queue_list_free(pr->draw_queue_2pass);
-       pr->draw_queue_2pass = NULL;
-
-       if (pr->draw_idle_id != -1) g_source_remove(pr->draw_idle_id);
-       pr->draw_idle_id = -1;
-}
-
-static void pr_queue_merge(QueueData *parent, QueueData *qd)
-{
-       if (parent->x + parent->w < qd->x + qd->w)
-               {
-               parent->w += (qd->x + qd->w) - (parent->x + parent->w);
-               }
-       if (parent->x > qd->x)
-               {
-               parent->w += parent->x - qd->x;
-               parent->x = qd->x;
-               }
-
-       if (parent->y + parent->h < qd->y + qd->h)
-               {
-               parent->h += (qd->y + qd->h) - (parent->y + parent->h);
-               }
-       if (parent->y > qd->y)
-               {
-               parent->h += parent->y - qd->y;
-               parent->y = qd->y;
-               }
-
-       parent->new_data |= qd->new_data;
-}
-
-static gint pr_clamp_to_visible(PixbufRenderer *pr, gint *x, gint *y, gint *w, gint *h)
-{
-       gint nx, ny;
-       gint nw, nh;
-       gint vx, vy;
-       gint vw, vh;
-
-       vw = pr->vis_width;
-       vh = pr->vis_height;
-
-       vx = pr->x_scroll;
-       vy = pr->y_scroll;
-
-       if (*x + *w < vx || *x > vx + vw || *y + *h < vy || *y > vy + vh) return FALSE;
-
-       /* now clamp it */
-       nx = CLAMP(*x, vx, vx + vw);
-       nw = CLAMP(*w - (nx - *x), 1, vw);
-
-       ny = CLAMP(*y, vy, vy + vh);
-       nh = CLAMP(*h - (ny - *y), 1, vh);
-
-       *x = nx;
-       *y = ny;
-       *w = nw;
-       *h = nh;
-
-       return TRUE;
-}
-
-static gint pr_queue_to_tiles(PixbufRenderer *pr, gint x, gint y, gint w, gint h,
-                             gint clamp, ImageTileRenderType render, gint new_data, gint only_existing)
-{
-       gint i, j;
-       gint x1, x2;
-       gint y1, y2;
-
-       if (clamp && !pr_clamp_to_visible(pr, &x, &y, &w, &h)) return FALSE;
-
-       x1 = (gint)floor(x / pr->tile_width) * pr->tile_width;
-       x2 = (gint)ceil((x + w) / pr->tile_width) * pr->tile_width;
-
-       y1 = (gint)floor(y / pr->tile_height) * pr->tile_height;
-       y2 = (gint)ceil((y + h) / pr->tile_height) * pr->tile_height;
-
-       for (j = y1; j <= y2; j += pr->tile_height)
-               {
-               for (i = x1; i <= x2; i += pr->tile_width)
-                       {
-                       ImageTile *it;
-
-                       it = pr_tile_get(pr, i, j,
-                                        (only_existing &&
-                                         (i + pr->tile_width < pr->x_scroll ||
-                                          i > pr->x_scroll + pr->vis_width ||
-                                          j + pr->tile_height < pr->y_scroll ||
-                                          j > pr->y_scroll + pr->vis_height)));
-                       if (it)
-                               {
-                               QueueData *qd;
-
-                               if ((render == TILE_RENDER_ALL && it->render_done != TILE_RENDER_ALL) ||
-                                   (render == TILE_RENDER_AREA && it->render_todo != TILE_RENDER_ALL))
-                                       {
-                                       it->render_todo = render;
-                                       }
-
-                               qd = g_new(QueueData, 1);
-                               qd->it = it;
-                               qd->new_data = new_data;
-
-                               if (i < x)
-                                       {
-                                       qd->x = x - i;
-                                       }
-                               else
-                                       {
-                                       qd->x = 0;
-                                       }
-                               qd->w = x + w - i - qd->x;
-                               if (qd->x + qd->w > pr->tile_width) qd->w = pr->tile_width - qd->x;
-
-                               if (j < y)
-                                       {
-                                       qd->y = y - j;
-                                       }
-                               else
-                                       {
-                                       qd->y = 0;
-                                       }
-                               qd->h = y + h - j - qd->y;
-                               if (qd->y + qd->h > pr->tile_height) qd->h = pr->tile_height - qd->y;
-
-                               if (qd->w < 1 || qd->h < 1)
-                                       {
-                                       g_free(qd);
-                                       }
-                               else if (it->qd)
-                                       {
-                                       pr_queue_merge(it->qd, qd);
-                                       g_free(qd);
-                                       }
-                               else
-                                       {
-                                       it->qd = qd;
-                                       pr->draw_queue = g_list_append(pr->draw_queue, qd);
-                                       }
-                               }
-                       }
-               }
-
-       return TRUE;
-}
-
-static void pr_queue(PixbufRenderer *pr, gint x, gint y, gint w, gint h,
-                    gint clamp, ImageTileRenderType render, gint new_data, gint only_existing)
-{
-       gint nx, ny;
-
-       nx = CLAMP(x, 0, pr->width - 1);
-       ny = CLAMP(y, 0, pr->height - 1);
-       w -= (nx - x);
-       h -= (ny - y);
-       w = CLAMP(w, 0, pr->width - nx);
-       h = CLAMP(h, 0, pr->height - ny);
-       if (w < 1 || h < 1) return;
-
-       if (pr_queue_to_tiles(pr, nx, ny, w, h, clamp, render, new_data, only_existing) &&
-           ((!pr->draw_queue && !pr->draw_queue_2pass) || pr->draw_idle_id == -1 || !pr->draw_idle_high))
-               {
-               if (pr->draw_idle_id != -1) g_source_remove(pr->draw_idle_id);
-               pr->draw_idle_id = g_idle_add_full(GDK_PRIORITY_REDRAW,
-                                                  pr_queue_draw_idle_cb, pr, NULL);
-               pr->draw_idle_high = TRUE;
-               }
-}
-
-static void pr_redraw(PixbufRenderer *pr, gint new_data)
-{
-       pr_queue_clear(pr);
-       pr_queue(pr, 0, 0, pr->width, pr->height, TRUE, TILE_RENDER_ALL, new_data, FALSE);
-}
-
-/*
- *-------------------------------------------------------------------
- * signal emission
- *-------------------------------------------------------------------
- */
-
-static void pr_update_signal(PixbufRenderer *pr)
-{
-#if 0
-       printf("FIXME: send updated signal\n");
-#endif
-       if (debug) printf("%s pixbuf renderer updated - started drawing %p\n", get_exec_time(), pr);
-       pr->debug_updated = TRUE;
-}
-
-static void pr_zoom_signal(PixbufRenderer *pr)
-{
-       g_signal_emit(pr, signals[SIGNAL_ZOOM], 0, pr->zoom);
-}
-
-static void pr_clicked_signal(PixbufRenderer *pr, GdkEventButton *bevent)
-{
-       g_signal_emit(pr, signals[SIGNAL_CLICKED], 0, bevent);
-}
-
-static void pr_scroll_notify_signal(PixbufRenderer *pr)
-{
-       g_signal_emit(pr, signals[SIGNAL_SCROLL_NOTIFY], 0);
-}
-
-static void pr_render_complete_signal(PixbufRenderer *pr)
-{
-       if (!pr->complete)
-               {
-               g_signal_emit(pr, signals[SIGNAL_RENDER_COMPLETE], 0);
-               g_object_set(G_OBJECT(pr), "complete", TRUE, NULL);
-               }
-       if (pr->debug_updated)
-               {
-               if (debug) printf("%s pixbuf renderer done %p\n", get_exec_time(), pr);
-               pr->debug_updated = FALSE;
-               }
-}
-
-static void pr_drag_signal(PixbufRenderer *pr, GdkEventButton *bevent)
-{
-       g_signal_emit(pr, signals[SIGNAL_DRAG], 0, bevent);
-}
-
-/*
- *-------------------------------------------------------------------
- * sync and clamp
- *-------------------------------------------------------------------
- */
-
-static gint pr_scroll_clamp(PixbufRenderer *pr)
-{
-       gint old_xs;
-       gint old_ys;
-
-       if (pr->zoom == 0.0)
+       if (pr->zoom == 0.0)
                {
                pr->x_scroll = 0;
                pr->y_scroll = 0;
@@ -3069,48 +1549,52 @@ static gint pr_scroll_clamp(PixbufRenderer *pr)
                pr->y_scroll = CLAMP(pr->y_scroll, 0, pr->height - pr->vis_height);
                }
 
+       pixbuf_renderer_sync_scroll_center(pr);
+
        return (old_xs != pr->x_scroll || old_ys != pr->y_scroll);
 }
 
-static gint pr_size_clamp(PixbufRenderer *pr)
+static gboolean pr_size_clamp(PixbufRenderer *pr)
 {
        gint old_vw, old_vh;
 
        old_vw = pr->vis_width;
        old_vh = pr->vis_height;
 
-       if (pr->width < pr->window_width)
+       if (pr->width < pr->viewport_width)
                {
                pr->vis_width = pr->width;
-               pr->x_offset = (pr->window_width - pr->width) / 2;
+               pr->x_offset = (pr->viewport_width - pr->width) / 2;
                }
        else
                {
-               pr->vis_width = pr->window_width;
+               pr->vis_width = pr->viewport_width;
                pr->x_offset = 0;
                }
 
-       if (pr->height < pr->window_height)
+       if (pr->height < pr->viewport_height)
                {
                pr->vis_height = pr->height;
-               pr->y_offset = (pr->window_height - pr->height) / 2;
+               pr->y_offset = (pr->viewport_height - pr->height) / 2;
                }
        else
                {
-               pr->vis_height = pr->window_height;
+               pr->vis_height = pr->viewport_height;
                pr->y_offset = 0;
                }
 
+       pixbuf_renderer_sync_scroll_center(pr);
+
        return (old_vw != pr->vis_width || old_vh != pr->vis_height);
 }
 
-static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
-                         gint force, gint new, gint invalidate,
-                         gint *redrawn)
+static gboolean pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
+                             PrZoomFlags flags)
 {
        gint w, h;
        gdouble scale;
-       gint invalid;
+       gboolean force = !!(flags & PR_ZOOM_FORCE);
+       gboolean new = !!(flags & PR_ZOOM_NEW);
 
        zoom = CLAMP(zoom, pr->zoom_min, pr->zoom_max);
 
@@ -3127,7 +1611,7 @@ static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
                {
                gint max_w;
                gint max_h;
-               gint sizeable;
+               gboolean sizeable;
 
                sizeable = (new && pr_parent_window_sizable(pr));
 
@@ -3144,15 +1628,15 @@ static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
                        }
                else
                        {
-                       max_w = pr->window_width;
-                       max_h = pr->window_height;
+                       max_w = pr->viewport_width;
+                       max_h = pr->viewport_height;
                        }
 
                if ((pr->zoom_expand && !sizeable) || w > max_w || h > max_h)
                        {
-                       if ((gdouble)max_w / w > (gdouble)max_h / h)
+                       if ((gdouble)max_w / w > (gdouble)max_h / h / pr->aspect_ratio)
                                {
-                               scale = (gdouble)max_h / h;
+                               scale = (gdouble)max_h / h / pr->aspect_ratio;
                                h = max_h;
                                w = w * scale + 0.5;
                                if (w > max_w) w = max_w;
@@ -3161,7 +1645,7 @@ static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
                                {
                                scale = (gdouble)max_w / w;
                                w = max_w;
-                               h = h * scale + 0.5;
+                               h = h * scale * pr->aspect_ratio + 0.5;
                                if (h > max_h) h = max_h;
                                }
 
@@ -3172,7 +1656,7 @@ static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
                                h = h * factor + 0.5;
                                scale = scale * factor;
                                }
-                       
+
                        if (w < 1) w = 1;
                        if (h < 1) h = 1;
                        }
@@ -3185,41 +1669,35 @@ static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
                {
                scale = zoom;
                w = w * scale;
-               h = h * scale;
+               h = h * scale * pr->aspect_ratio;
                }
        else /* zoom out */
                {
                scale = 1.0 / (0.0 - zoom);
                w = w * scale;
-               h = h * scale;
+               h = h * scale * pr->aspect_ratio;
                }
 
-       invalid = (pr->width != w || pr->height != h);
-
        pr->zoom = zoom;
        pr->width = w;
        pr->height = h;
        pr->scale = scale;
 
-       if (invalidate || invalid)
-               {
-               pr_tile_invalidate_all(pr);
-               pr_redraw(pr, TRUE);
-               }
-       if (redrawn) *redrawn = (invalidate || invalid);
-
        return TRUE;
 }
 
 static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
-                        gint force, gint new,
-                        gint center_point, gint px, gint py)
+                        PrZoomFlags flags, gint px, gint py)
 {
        gdouble old_scale;
        gint old_cx, old_cy;
-       gint clamped;
-       gint sized;
-       gint redrawn = FALSE;
+       gboolean center_point = !!(flags & PR_ZOOM_CENTER);
+       gboolean force = !!(flags & PR_ZOOM_FORCE);
+       gboolean new = !!(flags & PR_ZOOM_NEW);
+       gboolean lazy = !!(flags & PR_ZOOM_LAZY);
+       PrZoomFlags clamp_flags = flags;
+       gdouble old_center_x = pr->norm_center_x;
+       gdouble old_center_y = pr->norm_center_y;
 
        old_scale = pr->scale;
        if (center_point)
@@ -3236,22 +1714,25 @@ static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
                old_cy = pr->y_scroll + pr->vis_height / 2;
                }
 
-       if (!pr_zoom_clamp(pr, zoom, force, new, force, &redrawn)) return;
+       if (force) clamp_flags |= PR_ZOOM_INVALIDATE;
+       if (!pr_zoom_clamp(pr, zoom, clamp_flags)) return;
 
-       clamped = pr_size_clamp(pr);
-       sized = pr_parent_window_resize(pr, pr->width, pr->height);
+       (void) pr_size_clamp(pr);
+       (void) pr_parent_window_resize(pr, pr->width, pr->height);
 
        if (force && new)
                {
                switch (pr->scroll_reset)
                        {
                        case PR_SCROLL_RESET_NOCHANGE:
-                               /* maintain old scroll position, do nothing */
+                               /* maintain old scroll position */
+                               pr->x_scroll = ((gdouble)pr->image_width * old_center_x * pr->scale) - pr->vis_width / 2;
+                               pr->y_scroll = ((gdouble)pr->image_height * old_center_y * pr->scale * pr->aspect_ratio) - pr->vis_height / 2;
                                break;
                        case PR_SCROLL_RESET_CENTER:
                                /* center new image */
-                               pr->x_scroll = ((double)pr->image_width / 2.0 * pr->scale) - pr->vis_width / 2;
-                               pr->y_scroll = ((double)pr->image_height / 2.0 * pr->scale) - pr->vis_height / 2;
+                               pr->x_scroll = ((gdouble)pr->image_width / 2.0 * pr->scale) - pr->vis_width / 2;
+                               pr->y_scroll = ((gdouble)pr->image_height / 2.0 * pr->scale * pr->aspect_ratio) - pr->vis_height / 2;
                                break;
                        case PR_SCROLL_RESET_TOPLEFT:
                        default:
@@ -3267,23 +1748,19 @@ static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
                if (center_point)
                        {
                        pr->x_scroll = old_cx / old_scale * pr->scale - (px - pr->x_offset);
-                       pr->y_scroll = old_cy / old_scale * pr->scale - (py - pr->y_offset);
+                       pr->y_scroll = old_cy / old_scale * pr->scale * pr->aspect_ratio - (py - pr->y_offset);
                        }
                else
                        {
                        pr->x_scroll = old_cx / old_scale * pr->scale - (pr->vis_width / 2);
-                       pr->y_scroll = old_cy / old_scale * pr->scale - (pr->vis_height / 2);
+                       pr->y_scroll = old_cy / old_scale * pr->scale * pr->aspect_ratio - (pr->vis_height / 2);
                        }
                }
 
        pr_scroll_clamp(pr);
 
-       /* If the window was not sized, redraw the image - we know there will be no size/expose signal.
-        * But even if a size is claimed, there is no guarantee that the window manager will allow it,
-        * so redraw the window anyway :/
-        */
-       if (sized || clamped) pr_border_clear(pr);
-       pr_redraw(pr, redrawn);
+       pr->renderer->update_zoom(pr->renderer, lazy);
+       if (pr->renderer2) pr->renderer2->update_zoom(pr->renderer2, lazy);
 
        pr_scroll_notify_signal(pr);
        pr_zoom_signal(pr);
@@ -3292,29 +1769,60 @@ static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
 
 static void pr_size_sync(PixbufRenderer *pr, gint new_width, gint new_height)
 {
-       gint zoom_changed = FALSE;
+       gboolean zoom_changed = FALSE;
 
-       if (pr->window_width == new_width && pr->window_height == new_height) return;
+       gint new_viewport_width = new_width;
+       gint new_viewport_height = new_height;
+
+       if (!pr->stereo_temp_disable)
+               {
+               if (pr->stereo_mode & PR_STEREO_HORIZ)
+                       {
+                       new_viewport_width = new_width / 2;
+                       }
+               else if (pr->stereo_mode & PR_STEREO_VERT)
+                       {
+                       new_viewport_height = new_height / 2;
+                       }
+               else if (pr->stereo_mode & PR_STEREO_FIXED)
+                       {
+                       new_viewport_width = pr->stereo_fixed_width;
+                       new_viewport_height = pr->stereo_fixed_height;
+                       }
+               }
+               
+       if (pr->window_width == new_width && pr->window_height == new_height &&
+           pr->viewport_width == new_viewport_width && pr->viewport_height == new_viewport_height) return;
 
        pr->window_width = new_width;
        pr->window_height = new_height;
+       pr->viewport_width = new_viewport_width;
+       pr->viewport_height = new_viewport_height;
 
        if (pr->zoom == 0.0)
                {
                gdouble old_scale = pr->scale;
-               pr_zoom_clamp(pr, 0.0, TRUE, FALSE, FALSE, NULL);
+               pr_zoom_clamp(pr, 0.0, PR_ZOOM_FORCE);
                zoom_changed = (old_scale != pr->scale);
                }
 
        pr_size_clamp(pr);
        pr_scroll_clamp(pr);
 
-       pr_overlay_update_sizes(pr);
+       if (zoom_changed)
+               {
+               pr->renderer->update_zoom(pr->renderer, FALSE);
+               if (pr->renderer2) pr->renderer2->update_zoom(pr->renderer2, FALSE);
+               }
+
+       pr->renderer->update_viewport(pr->renderer);
+       if (pr->renderer2) pr->renderer2->update_viewport(pr->renderer2);
+
 
        /* ensure scroller remains visible */
        if (pr->scroller_overlay != -1)
                {
-               gint update = FALSE;
+               gboolean update = FALSE;
 
                if (pr->scroller_x > new_width)
                        {
@@ -3345,8 +1853,6 @@ static void pr_size_sync(PixbufRenderer *pr, gint new_width, gint new_height)
                        }
                }
 
-       pr_border_clear(pr);
-
        pr_scroll_notify_signal(pr);
        if (zoom_changed) pr_zoom_signal(pr);
        pr_update_signal(pr);
@@ -3359,21 +1865,6 @@ static void pr_size_cb(GtkWidget *widget, GtkAllocation *allocation, gpointer da
        pr_size_sync(pr, allocation->width, allocation->height);
 }
 
-static void pixbuf_renderer_paint(PixbufRenderer *pr, GdkRectangle *area)
-{
-       gint x, y;
-
-       pr_border_draw(pr, area->x, area->y, area->width, area->height);
-
-       x = MAX(0, (gint)area->x - pr->x_offset + pr->x_scroll);
-       y = MAX(0, (gint)area->y - pr->y_offset + pr->y_scroll);
-
-       pr_queue(pr, x, y,
-                MIN((gint)area->width, pr->width - x),
-                MIN((gint)area->height, pr->height - y),
-                FALSE, TILE_RENDER_ALL, FALSE, FALSE);
-}
-
 /*
  *-------------------------------------------------------------------
  * scrolling
@@ -3384,7 +1875,6 @@ void pixbuf_renderer_scroll(PixbufRenderer *pr, gint x, gint y)
 {
        gint old_x, old_y;
        gint x_off, y_off;
-       gint w, h;
 
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
@@ -3397,97 +1887,18 @@ void pixbuf_renderer_scroll(PixbufRenderer *pr, gint x, gint y)
        pr->y_scroll += y;
 
        pr_scroll_clamp(pr);
+       
+       pixbuf_renderer_sync_scroll_center(pr);
+       
        if (pr->x_scroll == old_x && pr->y_scroll == old_y) return;
 
        pr_scroll_notify_signal(pr);
 
        x_off = pr->x_scroll - old_x;
        y_off = pr->y_scroll - old_y;
-
-       w = pr->vis_width - abs(x_off);
-       h = pr->vis_height - abs(y_off);
-
-       if (w < 1 || h < 1)
-               {
-               /* scrolled completely to new material */
-               pr_queue(pr, 0, 0, pr->width, pr->height, TRUE, TILE_RENDER_ALL, FALSE, FALSE);
-               return;
-               }
-       else
-               {
-               gint x1, y1;
-               gint x2, y2;
-               GtkWidget *box;
-               GdkGC *gc;
-               GdkEvent *event;
-
-               if (x_off < 0)
-                       {
-                       x1 = abs(x_off);
-                       x2 = 0;
-                       }
-               else
-                       {
-                       x1 = 0;
-                       x2 = abs(x_off);
-                       }
-
-               if (y_off < 0)
-                       {
-                       y1 = abs(y_off);
-                       y2 = 0;
-                       }
-               else
-                       {
-                       y1 = 0;
-                       y2 = abs(y_off);
-                       }
-
-               box = GTK_WIDGET(pr);
-
-               gc = gdk_gc_new(box->window);
-               gdk_gc_set_exposures(gc, TRUE);
-               gdk_draw_drawable(box->window, gc,
-                                 box->window,
-                                 x2 + pr->x_offset, y2 + pr->y_offset,
-                                 x1 + pr->x_offset, y1 + pr->y_offset, w, h);
-               g_object_unref(gc);
-
-               if (pr->overlay_list)
-                       {
-                       pr_overlay_queue_all(pr);
-                       }
-
-               w = pr->vis_width - w;
-               h = pr->vis_height - h;
-
-               if (w > 0)
-                       {
-                       pr_queue(pr,
-                                x_off > 0 ? pr->x_scroll + (pr->vis_width - w) : pr->x_scroll, pr->y_scroll,
-                                w, pr->vis_height, TRUE, TILE_RENDER_ALL, FALSE, FALSE);
-                       }
-               if (h > 0)
-                       {
-                       /* FIXME, to optimize this, remove overlap */
-                       pr_queue(pr,
-                                pr->x_scroll, y_off > 0 ? pr->y_scroll + (pr->vis_height - h) : pr->y_scroll,
-                                pr->vis_width, h, TRUE, TILE_RENDER_ALL, FALSE, FALSE);
-                       }
-
-               /* process exposures here, "expose_event" seems to miss a few with obstructed windows */
-               while ((event = gdk_event_get_graphics_expose(box->window)) != NULL)
-                       {
-                       pixbuf_renderer_paint(pr, &event->expose.area);
-
-                       if (event->expose.count == 0)
-                               {
-                               gdk_event_free(event);
-                               break;
-                               }
-                       gdk_event_free(event);
-                       }
-               }
+       
+       pr->renderer->scroll(pr->renderer, x_off, y_off);
+       if (pr->renderer2) pr->renderer2->scroll(pr->renderer2, x_off, y_off);
 }
 
 void pixbuf_renderer_scroll_to_point(PixbufRenderer *pr, gint x, gint y,
@@ -3503,7 +1914,7 @@ void pixbuf_renderer_scroll_to_point(PixbufRenderer *pr, gint x, gint y,
        ay = (gdouble)pr->vis_height * y_align;
 
        px = (gdouble)x * pr->scale - (pr->x_scroll + ax);
-       py = (gdouble)y * pr->scale - (pr->y_scroll + ay);
+       py = (gdouble)y * pr->scale * pr->aspect_ratio - (pr->y_scroll + ay);
 
        pixbuf_renderer_scroll(pr, px, py);
 }
@@ -3512,13 +1923,8 @@ void pixbuf_renderer_scroll_to_point(PixbufRenderer *pr, gint x, gint y,
 
 void pixbuf_renderer_get_scroll_center(PixbufRenderer *pr, gdouble *x, gdouble *y)
 {
-       gint src_x, src_y;
-       
-       src_x = pr->x_scroll + pr->vis_width / 2;
-       src_y = pr->y_scroll + pr->vis_height / 2;
-
-       *x = (gdouble)src_x / pr->width;
-       *y = (gdouble)src_y / pr->height;
+       *x = pr->norm_center_x;
+       *y = pr->norm_center_y;
 }
 
 void pixbuf_renderer_set_scroll_center(PixbufRenderer *pr, gdouble x, gdouble y)
@@ -3528,12 +1934,11 @@ void pixbuf_renderer_set_scroll_center(PixbufRenderer *pr, gdouble x, gdouble y)
        dst_x = x * pr->width  - pr->vis_width  / 2 - pr->x_scroll + CLAMP(pr->subpixel_x_scroll, -1.0, 1.0);
        dst_y = y * pr->height - pr->vis_height / 2 - pr->y_scroll + CLAMP(pr->subpixel_y_scroll, -1.0, 1.0);
 
-       pr->subpixel_x_scroll = dst_x - (int)dst_x;
-       pr->subpixel_y_scroll = dst_y - (int)dst_y;
-       
-       pixbuf_renderer_scroll(pr, (int)dst_x, (int)dst_y);
-}
+       pr->subpixel_x_scroll = dst_x - (gint)dst_x;
+       pr->subpixel_y_scroll = dst_y - (gint)dst_y;
 
+       pixbuf_renderer_scroll(pr, (gint)dst_x, (gint)dst_y);
+}
 
 /*
  *-------------------------------------------------------------------
@@ -3541,19 +1946,30 @@ void pixbuf_renderer_set_scroll_center(PixbufRenderer *pr, gdouble x, gdouble y)
  *-------------------------------------------------------------------
  */
 
-static gint pr_mouse_motion_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
+static gboolean pr_mouse_motion_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
 {
        PixbufRenderer *pr;
        gint accel;
 
+       /* This is a hack, but work far the best, at least for single pointer systems.
+        * See http://bugzilla.gnome.org/show_bug.cgi?id=587714 for more. */
+       gint x, y;
+       gdk_window_get_pointer (bevent->window, &x, &y, NULL);
+       bevent->x = x;
+       bevent->y = y;
+
        pr = PIXBUF_RENDERER(widget);
 
-       if (pr->scroller_id != -1)
+       if (pr->scroller_id)
                {
                pr->scroller_xpos = bevent->x;
                pr->scroller_ypos = bevent->y;
                }
-
+       
+       pr->x_mouse = bevent->x;
+       pr->y_mouse = bevent->y;
+       pr_update_pixel_signal(pr);
+       
        if (!pr->in_drag || !gdk_pointer_is_grabbed()) return FALSE;
 
        if (pr->drag_moved < PR_DRAG_SCROLL_THRESHHOLD)
@@ -3565,7 +1981,7 @@ static gint pr_mouse_motion_cb(GtkWidget *widget, GdkEventButton *bevent, gpoint
                widget_set_cursor(widget, GDK_FLEUR);
                }
 
-       if (bevent->state & GDK_SHIFT_MASK)
+       if (bevent->state & GDK_CONTROL_MASK)
                {
                accel = PR_PAN_SHIFT_MULTIPLIER;
                }
@@ -3583,34 +1999,51 @@ static gint pr_mouse_motion_cb(GtkWidget *widget, GdkEventButton *bevent, gpoint
        pr->drag_last_x = bevent->x;
        pr->drag_last_y = bevent->y;
 
+       /* This is recommended by the GTK+ documentation, but does not work properly.
+        * Use deprecated way until GTK+ gets a solution for correct motion hint handling:
+        * http://bugzilla.gnome.org/show_bug.cgi?id=587714
+        */
+       /* gdk_event_request_motions (bevent); */
+       return FALSE;
+}
+
+static gboolean pr_leave_notify_cb(GtkWidget *widget, GdkEventCrossing *cevent, gpointer data)
+{
+       PixbufRenderer *pr;
+
+       pr = PIXBUF_RENDERER(widget);
+       pr->x_mouse = -1;
+       pr->y_mouse = -1;
+
+       pr_update_pixel_signal(pr);
        return FALSE;
 }
 
-static gint pr_mouse_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
+static gboolean pr_mouse_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
 {
        PixbufRenderer *pr;
        GtkWidget *parent;
 
        pr = PIXBUF_RENDERER(widget);
 
-       if (pr->scroller_id != -1) return TRUE;
+       if (pr->scroller_id) return TRUE;
 
        switch (bevent->button)
                {
-               case 1:
+               case MOUSE_BUTTON_LEFT:
                        pr->in_drag = TRUE;
                        pr->drag_last_x = bevent->x;
                        pr->drag_last_y = bevent->y;
                        pr->drag_moved = 0;
-                       gdk_pointer_grab(widget->window, FALSE,
-                                        GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
+                       gdk_pointer_grab(gtk_widget_get_window(widget), FALSE,
+                                        GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_RELEASE_MASK,
                                         NULL, NULL, bevent->time);
                        gtk_grab_add(widget);
                        break;
-               case 2:
+               case MOUSE_BUTTON_MIDDLE:
                        pr->drag_moved = 0;
                        break;
-               case 3:
+               case MOUSE_BUTTON_RIGHT:
                        pr_clicked_signal(pr, bevent);
                        break;
                default:
@@ -3618,7 +2051,7 @@ static gint pr_mouse_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointe
                }
 
        parent = gtk_widget_get_parent(widget);
-       if (widget && GTK_WIDGET_CAN_FOCUS(parent))
+       if (widget && gtk_widget_get_can_focus(parent))
                {
                gtk_widget_grab_focus(parent);
                }
@@ -3626,19 +2059,19 @@ static gint pr_mouse_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointe
        return FALSE;
 }
 
-static gint pr_mouse_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
+static gboolean pr_mouse_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
 {
        PixbufRenderer *pr;
 
        pr = PIXBUF_RENDERER(widget);
 
-       if (pr->scroller_id != -1)
+       if (pr->scroller_id)
                {
                pr_scroller_stop(pr);
                return TRUE;
                }
 
-       if (gdk_pointer_is_grabbed() && GTK_WIDGET_HAS_GRAB(pr))
+       if (gdk_pointer_is_grabbed() && gtk_widget_has_grab(GTK_WIDGET(pr)))
                {
                gtk_grab_remove(widget);
                gdk_pointer_ungrab(bevent->time);
@@ -3647,11 +2080,11 @@ static gint pr_mouse_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpoin
 
        if (pr->drag_moved < PR_DRAG_SCROLL_THRESHHOLD)
                {
-               if (bevent->button == 1 && (bevent->state & GDK_SHIFT_MASK))
+               if (bevent->button == MOUSE_BUTTON_LEFT && (bevent->state & GDK_CONTROL_MASK))
                        {
                        pr_scroller_start(pr, bevent->x, bevent->y);
                        }
-               else if (bevent->button == 1 || bevent->button == 2)
+               else if (bevent->button == MOUSE_BUTTON_LEFT || bevent->button == MOUSE_BUTTON_MIDDLE)
                        {
                        pr_clicked_signal(pr, bevent);
                        }
@@ -3662,13 +2095,13 @@ static gint pr_mouse_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpoin
        return FALSE;
 }
 
-static gint pr_mouse_leave_cb(GtkWidget *widget, GdkEventCrossing *event, gpointer data)
+static gboolean pr_mouse_leave_cb(GtkWidget *widget, GdkEventCrossing *event, gpointer data)
 {
        PixbufRenderer *pr;
 
        pr = PIXBUF_RENDERER(widget);
 
-       if (pr->scroller_id != -1)
+       if (pr->scroller_id)
                {
                pr->scroller_xpos = pr->scroller_x;
                pr->scroller_ypos = pr->scroller_y;
@@ -3698,9 +2131,11 @@ static void pr_signals_connect(PixbufRenderer *pr)
                         G_CALLBACK(pr_mouse_release_cb), pr);
        g_signal_connect(G_OBJECT(pr), "leave_notify_event",
                         G_CALLBACK(pr_mouse_leave_cb), pr);
+       g_signal_connect(G_OBJECT(pr), "leave_notify_event",
+                        G_CALLBACK(pr_leave_notify_cb), pr);
 
-       gtk_widget_set_events(GTK_WIDGET(pr), GDK_POINTER_MOTION_MASK |
-                                             GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK |
+       gtk_widget_set_events(GTK_WIDGET(pr), GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK |
+                                             GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK | GDK_SCROLL_MASK |
                                              GDK_LEAVE_NOTIFY_MASK);
 
        g_signal_connect(G_OBJECT(pr), "drag_begin",
@@ -3708,6 +2143,131 @@ static void pr_signals_connect(PixbufRenderer *pr)
 
 }
 
+/*
+ *-------------------------------------------------------------------
+ * stereo support
+ *-------------------------------------------------------------------
+ */
+
+#define COLOR_BYTES 3   /* rgb */
+static void pr_create_anaglyph_RC(GdkPixbuf *pixbuf, GdkPixbuf *right, gint x, gint y, gint w, gint h)
+{
+       gint srs, drs;
+       guchar *s_pix, *d_pix;
+       guchar *sp, *dp;
+       guchar *spi, *dpi;
+       gint i, j;
+
+       srs = gdk_pixbuf_get_rowstride(right);
+       s_pix = gdk_pixbuf_get_pixels(right);
+       spi = s_pix + (x * COLOR_BYTES);
+
+       drs = gdk_pixbuf_get_rowstride(pixbuf);
+       d_pix = gdk_pixbuf_get_pixels(pixbuf);
+       dpi =  d_pix + x * COLOR_BYTES;
+
+       for (i = y; i < y + h; i++)
+               {
+               sp = spi + (i * srs);
+               dp = dpi + (i * drs);
+               for (j = 0; j < w; j++)
+                       {
+                       *dp = *sp; /* copy red channel */
+                       sp += COLOR_BYTES;
+                       dp += COLOR_BYTES;
+                       }
+               }
+}
+
+static void pr_create_anaglyph_gray(GdkPixbuf *pixbuf, GdkPixbuf *right, gint x, gint y, gint w, gint h)
+{
+       gint srs, drs;
+       guchar *s_pix, *d_pix;
+       guchar *sp, *dp;
+       guchar *spi, *dpi;
+       gint i, j;
+       const double gc[3] = {0.299, 0.587, 0.114};
+
+       srs = gdk_pixbuf_get_rowstride(right);
+       s_pix = gdk_pixbuf_get_pixels(right);
+       spi = s_pix + (x * COLOR_BYTES);
+
+       drs = gdk_pixbuf_get_rowstride(pixbuf);
+       d_pix = gdk_pixbuf_get_pixels(pixbuf);
+       dpi =  d_pix + x * COLOR_BYTES;
+
+       for (i = y; i < y + h; i++)
+               {
+               sp = spi + (i * srs);
+               dp = dpi + (i * drs);
+               for (j = 0; j < w; j++)
+                       {
+                       guchar g1 = dp[0] * gc[0] + dp[1] * gc[1] + dp[2] * gc[2];
+                       guchar g2 = sp[0] * gc[0] + sp[1] * gc[1] + sp[2] * gc[2];
+                       dp[0] = g2; /* red channel from sp */
+                       dp[1] = g1; /* green and blue from dp */
+                       dp[2] = g1;
+                       sp += COLOR_BYTES;
+                       dp += COLOR_BYTES;
+                       }
+               }
+}
+
+const double pr_dubois_matrix[3][6] = {
+       { 0.456,  0.500,  0.176, -0.043, -0.088, -0.002},
+       {-0.040, -0.038, -0.016,  0.378,  0.734, -0.018},
+       {-0.015, -0.021, -0.005, -0.072, -0.113,  1.226}
+       };
+
+static void pr_create_anaglyph_dubois(GdkPixbuf *pixbuf, GdkPixbuf *right, gint x, gint y, gint w, gint h)
+{
+       gint srs, drs;
+       guchar *s_pix, *d_pix;
+       guchar *sp, *dp;
+       guchar *spi, *dpi;
+       gint i, j, k;
+
+       srs = gdk_pixbuf_get_rowstride(right);
+       s_pix = gdk_pixbuf_get_pixels(right);
+       spi = s_pix + (x * COLOR_BYTES);
+
+       drs = gdk_pixbuf_get_rowstride(pixbuf);
+       d_pix = gdk_pixbuf_get_pixels(pixbuf);
+       dpi =  d_pix + x * COLOR_BYTES;
+
+       for (i = y; i < y + h; i++)
+               {
+               sp = spi + (i * srs);
+               dp = dpi + (i * drs);
+               for (j = 0; j < w; j++)
+                       {
+                       double res[3];
+                       for (k = 0; k < 3; k++)
+                               {
+                               const double *m = pr_dubois_matrix[k];
+                               res[k] = sp[0] * m[0] + sp[1] * m[1] + sp[2] * m[2] + dp[0] * m[3] + dp[1] * m[4] + dp[2] * m[5];
+                               if (res[k] < 0.0) res[k] = 0;
+                               if (res[k] > 255.0) res[k] = 255.0;
+                               }
+                       dp[0] = res[0];
+                       dp[1] = res[1];
+                       dp[2] = res[2];
+                       sp += COLOR_BYTES;
+                       dp += COLOR_BYTES;
+                       }
+               }
+}
+void pr_create_anaglyph(guint mode, GdkPixbuf *pixbuf, GdkPixbuf *right, gint x, gint y, gint w, gint h)
+{
+       if (mode & PR_STEREO_ANAGLYPH_RC)
+               pr_create_anaglyph_RC(pixbuf, right, x, y, w, h);
+       else if (mode & PR_STEREO_ANAGLYPH_GRAY)
+               pr_create_anaglyph_gray(pixbuf, right, x, y, w, h);
+       else if (mode & PR_STEREO_ANAGLYPH_DB)
+               pr_create_anaglyph_dubois(pixbuf, right, x, y, w, h);
+}
+
 /*
  *-------------------------------------------------------------------
  * public
@@ -3715,6 +2275,8 @@ static void pr_signals_connect(PixbufRenderer *pr)
  */
 static void pr_pixbuf_size_sync(PixbufRenderer *pr)
 {
+       pr->stereo_pixbuf_offset_left = 0;
+       pr->stereo_pixbuf_offset_right = 0;
        if (!pr->pixbuf) return;
        switch (pr->orientation)
                {
@@ -3724,57 +2286,89 @@ static void pr_pixbuf_size_sync(PixbufRenderer *pr)
                case EXIF_ORIENTATION_LEFT_BOTTOM:
                        pr->image_width = gdk_pixbuf_get_height(pr->pixbuf);
                        pr->image_height = gdk_pixbuf_get_width(pr->pixbuf);
+                       if (pr->stereo_data == STEREO_PIXBUF_SBS)
+                               {
+                               pr->image_height /= 2;
+                               pr->stereo_pixbuf_offset_right = pr->image_height;
+                               }
+                       else if (pr->stereo_data == STEREO_PIXBUF_CROSS)
+                               {
+                               pr->image_height /= 2;
+                               pr->stereo_pixbuf_offset_left = pr->image_height;
+                               }
+                       
                        break;
                default:
                        pr->image_width = gdk_pixbuf_get_width(pr->pixbuf);
                        pr->image_height = gdk_pixbuf_get_height(pr->pixbuf);
+                       if (pr->stereo_data == STEREO_PIXBUF_SBS)
+                               {
+                               pr->image_width /= 2;
+                               pr->stereo_pixbuf_offset_right = pr->image_width;
+                               }
+                       else if (pr->stereo_data == STEREO_PIXBUF_CROSS)
+                               {
+                               pr->image_width /= 2;
+                               pr->stereo_pixbuf_offset_left = pr->image_width;
+                               }
                }
 }
 
-static void pr_pixbuf_sync(PixbufRenderer *pr, gdouble zoom)
+static void pr_set_pixbuf(PixbufRenderer *pr, GdkPixbuf *pixbuf, gdouble zoom, PrZoomFlags flags)
 {
+       if (pixbuf) g_object_ref(pixbuf);
+       if (pr->pixbuf) g_object_unref(pr->pixbuf);
+       pr->pixbuf = pixbuf;
+
        if (!pr->pixbuf)
                {
-               GtkWidget *box;
-
                /* no pixbuf so just clear the window */
                pr->image_width = 0;
                pr->image_height = 0;
                pr->scale = 1.0;
+               pr->zoom = zoom; /* don't throw away the zoom value, it is set by pixbuf_renderer_move, among others,
+                                   and used for pixbuf_renderer_zoom_get */
 
-               box = GTK_WIDGET(pr);
-
-               if (GTK_WIDGET_REALIZED(box))
-                       {
-                       gdk_window_clear(box->window);
-                       pr_overlay_draw(pr, 0, 0, pr->window_width, pr->window_height, NULL);
-                       }
+               pr->renderer->update_pixbuf(pr->renderer, flags & PR_ZOOM_LAZY);
+               if (pr->renderer2) pr->renderer2->update_pixbuf(pr->renderer2, flags & PR_ZOOM_LAZY);
 
                pr_update_signal(pr);
 
                return;
                }
-               
+
+       if (pr->stereo_mode & PR_STEREO_TEMP_DISABLE)
+               {
+               gint disable = !pr->pixbuf || ! pr->stereo_data;
+               pr_stereo_temp_disable(pr, disable);
+               }
+
        pr_pixbuf_size_sync(pr);
-       pr_zoom_sync(pr, zoom, TRUE, TRUE, FALSE, 0, 0);
+       pr->renderer->update_pixbuf(pr->renderer, flags & PR_ZOOM_LAZY);
+       if (pr->renderer2) pr->renderer2->update_pixbuf(pr->renderer2, flags & PR_ZOOM_LAZY);
+       pr_zoom_sync(pr, zoom, flags | PR_ZOOM_FORCE | PR_ZOOM_NEW, 0, 0);
 }
 
-static void pr_set_pixbuf(PixbufRenderer *pr, GdkPixbuf *pixbuf, gdouble zoom)
+void pixbuf_renderer_set_pixbuf(PixbufRenderer *pr, GdkPixbuf *pixbuf, gdouble zoom)
 {
-       if (pixbuf) g_object_ref(pixbuf);
-       if (pr->pixbuf) g_object_unref(pr->pixbuf);
-       pr->pixbuf = pixbuf;
+       g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
-       pr_pixbuf_sync(pr, zoom);
+       pr_source_tile_unset(pr);
+
+       pr_set_pixbuf(pr, pixbuf, zoom, 0);
+
+       pr_update_signal(pr);
 }
 
-void pixbuf_renderer_set_pixbuf(PixbufRenderer *pr, GdkPixbuf *pixbuf, gdouble zoom)
+void pixbuf_renderer_set_pixbuf_lazy(PixbufRenderer *pr, GdkPixbuf *pixbuf, gdouble zoom, gint orientation, StereoPixbufData stereo_data)
 {
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
        pr_source_tile_unset(pr);
 
-       pr_set_pixbuf(pr, pixbuf, zoom);
+       pr->orientation = orientation;
+       pr->stereo_data = stereo_data;
+       pr_set_pixbuf(pr, pixbuf, zoom, PR_ZOOM_LAZY);
 
        pr_update_signal(pr);
 }
@@ -3793,7 +2387,7 @@ void pixbuf_renderer_set_orientation(PixbufRenderer *pr, gint orientation)
        pr->orientation = orientation;
 
        pr_pixbuf_size_sync(pr);
-       pr_zoom_sync(pr, pr->zoom, TRUE, FALSE, FALSE, 0, 0);
+       pr_zoom_sync(pr, pr->zoom, PR_ZOOM_FORCE, 0, 0);
 }
 
 gint pixbuf_renderer_get_orientation(PixbufRenderer *pr)
@@ -3802,10 +2396,29 @@ gint pixbuf_renderer_get_orientation(PixbufRenderer *pr)
        return pr->orientation;
 }
 
-void pixbuf_renderer_set_post_process_func(PixbufRenderer *pr, PixbufRendererPostProcessFunc func, gpointer user_data, gint slow)
+void pixbuf_renderer_set_stereo_data(PixbufRenderer *pr, StereoPixbufData stereo_data)
 {
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
-       
+       if (pr->stereo_data == stereo_data) return;
+
+
+       pr->stereo_data = stereo_data;
+
+       if (pr->stereo_mode & PR_STEREO_TEMP_DISABLE)
+               {
+               gint disable = !pr->pixbuf || ! pr->stereo_data;
+               pr_stereo_temp_disable(pr, disable);
+               }
+       pr_pixbuf_size_sync(pr);
+       pr->renderer->update_pixbuf(pr->renderer, FALSE);
+       if (pr->renderer2) pr->renderer2->update_pixbuf(pr->renderer2, FALSE);
+       pr_zoom_sync(pr, pr->zoom, PR_ZOOM_FORCE, 0, 0);
+}
+
+void pixbuf_renderer_set_post_process_func(PixbufRenderer *pr, PixbufRendererPostProcessFunc func, gpointer user_data, gboolean slow)
+{
+       g_return_if_fail(IS_PIXBUF_RENDERER(pr));
+
        pr->func_post_process = func;
        pr->post_process_user_data = user_data;
        pr->post_process_slow = func && slow;
@@ -3833,6 +2446,8 @@ void pixbuf_renderer_move(PixbufRenderer *pr, PixbufRenderer *source)
 
        pr->x_scroll = source->x_scroll;
        pr->y_scroll = source->y_scroll;
+       pr->x_mouse  = source->x_mouse;
+       pr->y_mouse  = source->y_mouse;
 
        scroll_reset = pr->scroll_reset;
        pr->scroll_reset = PR_SCROLL_RESET_NOCHANGE;
@@ -3841,6 +2456,7 @@ void pixbuf_renderer_move(PixbufRenderer *pr, PixbufRenderer *source)
        pr->post_process_user_data = source->post_process_user_data;
        pr->post_process_slow = source->post_process_slow;
        pr->orientation = source->orientation;
+       pr->stereo_data = source->stereo_data;
 
        if (source->source_tiles_enabled)
                {
@@ -3860,8 +2476,7 @@ void pixbuf_renderer_move(PixbufRenderer *pr, PixbufRenderer *source)
                pr->source_tiles = source->source_tiles;
                source->source_tiles = NULL;
 
-               pr_zoom_sync(pr, source->zoom, TRUE, TRUE, FALSE, 0, 0);
-               pr_redraw(pr, TRUE);
+               pr_zoom_sync(pr, source->zoom, PR_ZOOM_FORCE | PR_ZOOM_NEW, 0, 0);
                }
        else
                {
@@ -3871,62 +2486,95 @@ void pixbuf_renderer_move(PixbufRenderer *pr, PixbufRenderer *source)
        pr->scroll_reset = scroll_reset;
 
        pixbuf_renderer_set_pixbuf(source, NULL, source->zoom);
-       pr_queue_clear(source);
-       pr_tile_free_all(source);
 }
 
-void pixbuf_renderer_area_changed(PixbufRenderer *pr, gint src_x, gint src_y, gint src_w, gint src_h)
+void pixbuf_renderer_copy(PixbufRenderer *pr, PixbufRenderer *source)
 {
-       gint x, y, width, height,  x1, y1, x2, y2;
+       GObject *object;
+       PixbufRendererScrollResetType scroll_reset;
 
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
+       g_return_if_fail(IS_PIXBUF_RENDERER(source));
 
-        pr_coords_map_orientation_reverse(pr,
-                                    src_x, src_y,
-                                    pr->image_width, pr->image_height,
-                                    src_w, src_h,
-                                    &x, &y,
-                                    &width, &height);
+       if (pr == source) return;
 
-       if (pr->source_tiles_enabled)
+       object = G_OBJECT(pr);
+
+       g_object_set(object, "zoom_min", source->zoom_min, NULL);
+       g_object_set(object, "zoom_max", source->zoom_max, NULL);
+       g_object_set(object, "loading", source->loading, NULL);
+
+       pr->complete = source->complete;
+
+       pr->x_scroll = source->x_scroll;
+       pr->y_scroll = source->y_scroll;
+       pr->x_mouse  = source->x_mouse;
+       pr->y_mouse  = source->y_mouse;
+
+       scroll_reset = pr->scroll_reset;
+       pr->scroll_reset = PR_SCROLL_RESET_NOCHANGE;
+
+       pr->orientation = source->orientation;
+       pr->stereo_data = source->stereo_data;
+
+       if (source->source_tiles_enabled)
                {
-               pr_source_tile_changed(pr, x, y, width, height);
-               }
+               pr->source_tiles_enabled = source->source_tiles_enabled;
+               pr->source_tiles_cache_size = source->source_tiles_cache_size;
+               pr->source_tile_width = source->source_tile_width;
+               pr->source_tile_height = source->source_tile_height;
+               pr->image_width = source->image_width;
+               pr->image_height = source->image_height;
+
+               pr->func_tile_request = source->func_tile_request;
+               pr->func_tile_dispose = source->func_tile_dispose;
+               pr->func_tile_data = source->func_tile_data;
+
+               pr->source_tiles = source->source_tiles;
+               source->source_tiles = NULL;
 
-       if (pr->scale != 1.0 && pr->zoom_quality != GDK_INTERP_NEAREST)
+               pr_zoom_sync(pr, source->zoom, PR_ZOOM_FORCE | PR_ZOOM_NEW, 0, 0);
+               }
+       else
                {
-               /* increase region when using a zoom quality that may access surrounding pixels */
-               y -= 1;
-               height += 2;
+               pixbuf_renderer_set_pixbuf(pr, source->pixbuf, source->zoom);
                }
 
-       x1 = (gint)floor((double)x * pr->scale);
-       y1 = (gint)floor((double)y * pr->scale);
-       x2 = (gint)ceil((double)(x + width) * pr->scale);
-       y2 = (gint)ceil((double)(y + height) * pr->scale);
+       pr->scroll_reset = scroll_reset;
+}
+
+void pixbuf_renderer_area_changed(PixbufRenderer *pr, gint x, gint y, gint w, gint h)
+{
+       g_return_if_fail(IS_PIXBUF_RENDERER(pr));
+
+       if (pr->source_tiles_enabled)
+               {
+               pr_source_tile_changed(pr, x, y, w, h);
+               }
 
-       pr_queue(pr, x1, y1, x2 - x1, y2 - y1, FALSE, TILE_RENDER_AREA, TRUE, TRUE);
+       pr->renderer->area_changed(pr->renderer, x, y, w, h);
+       if (pr->renderer2) pr->renderer2->area_changed(pr->renderer2, x, y, w, h);
 }
 
 void pixbuf_renderer_zoom_adjust(PixbufRenderer *pr, gdouble increment)
 {
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
-       pr_zoom_adjust_real(pr, increment, FALSE, 0, 0);
+       pr_zoom_adjust_real(pr, increment, PR_ZOOM_NONE, 0, 0);
 }
 
 void pixbuf_renderer_zoom_adjust_at_point(PixbufRenderer *pr, gdouble increment, gint x, gint y)
 {
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
-       pr_zoom_adjust_real(pr, increment, TRUE, x, y);
+       pr_zoom_adjust_real(pr, increment, PR_ZOOM_CENTER, x, y);
 }
 
 void pixbuf_renderer_zoom_set(PixbufRenderer *pr, gdouble zoom)
 {
        g_return_if_fail(IS_PIXBUF_RENDERER(pr));
 
-       pr_zoom_sync(pr, zoom, FALSE, FALSE, FALSE, 0, 0);
+       pr_zoom_sync(pr, zoom, PR_ZOOM_NONE, 0, 0);
 }
 
 gdouble pixbuf_renderer_zoom_get(PixbufRenderer *pr)
@@ -3963,12 +2611,167 @@ void pixbuf_renderer_zoom_set_limits(PixbufRenderer *pr, gdouble min, gdouble ma
                }
 }
 
-gint pixbuf_renderer_get_image_size(PixbufRenderer *pr, gint *width, gint *height)
+static void pr_stereo_set(PixbufRenderer *pr)
+{
+       if (!pr->renderer) pr->renderer = pr_backend_renderer_new(pr);
+       
+       pr->renderer->stereo_set(pr->renderer, pr->stereo_mode & ~PR_STEREO_MIRROR_RIGHT & ~PR_STEREO_FLIP_RIGHT);
+       
+       if (pr->stereo_mode & (PR_STEREO_HORIZ | PR_STEREO_VERT | PR_STEREO_FIXED))
+               {
+               if (!pr->renderer2) pr->renderer2 = pr_backend_renderer_new(pr);
+               pr->renderer2->stereo_set(pr->renderer2, (pr->stereo_mode & ~PR_STEREO_MIRROR_LEFT & ~PR_STEREO_FLIP_LEFT) | PR_STEREO_RIGHT);
+               }
+       else
+               {
+               if (pr->renderer2) pr->renderer2->free(pr->renderer2);
+               pr->renderer2 = NULL;
+               }
+       if (pr->stereo_mode & PR_STEREO_HALF)
+               {
+               if (pr->stereo_mode & PR_STEREO_HORIZ) pr->aspect_ratio = 2.0;
+               else if (pr->stereo_mode & PR_STEREO_VERT) pr->aspect_ratio = 0.5;
+               else pr->aspect_ratio = 1.0;
+               }
+       else
+               {
+               pr->aspect_ratio = 1.0;
+               }
+}
+
+void pixbuf_renderer_stereo_set(PixbufRenderer *pr, gint stereo_mode)
+{
+       gboolean redraw = !(pr->stereo_mode == stereo_mode) || pr->stereo_temp_disable;
+       pr->stereo_mode = stereo_mode;
+       if ((stereo_mode & PR_STEREO_TEMP_DISABLE) && pr->stereo_temp_disable) return;
+       
+       pr->stereo_temp_disable = FALSE;
+       
+       pr_stereo_set(pr);
+       
+       if (redraw)
+               {
+               pr_size_sync(pr, pr->window_width, pr->window_height); /* recalculate new viewport */
+               pr_zoom_sync(pr, pr->zoom, PR_ZOOM_FORCE | PR_ZOOM_NEW, 0, 0);
+               }
+}
+
+void pixbuf_renderer_stereo_fixed_set(PixbufRenderer *pr, gint width, gint height, gint x1, gint y1, gint x2, gint y2)
+{
+       pr->stereo_fixed_width = width;
+       pr->stereo_fixed_height = height;
+       pr->stereo_fixed_x_left = x1;
+       pr->stereo_fixed_y_left = y1;
+       pr->stereo_fixed_x_right = x2;
+       pr->stereo_fixed_y_right = y2;
+}
+
+gint pixbuf_renderer_stereo_get(PixbufRenderer *pr)
+{
+       return pr->stereo_mode;
+}
+
+static void pr_stereo_temp_disable(PixbufRenderer *pr, gboolean disable)
+{
+       if (pr->stereo_temp_disable == disable) return;
+       pr->stereo_temp_disable = disable;
+       if (disable)
+               {
+               if (!pr->renderer) pr->renderer = pr_backend_renderer_new(pr);
+               pr->renderer->stereo_set(pr->renderer, PR_STEREO_NONE);
+               if (pr->renderer2) pr->renderer2->free(pr->renderer2);
+               pr->renderer2 = NULL;
+               pr->aspect_ratio = 1.0;
+               }
+       else
+               {
+               pr_stereo_set(pr);
+               }
+       pr_size_sync(pr, pr->window_width, pr->window_height); /* recalculate new viewport */
+}
+
+gboolean pixbuf_renderer_get_pixel_colors(PixbufRenderer *pr, gint x_pixel, gint y_pixel,
+                                          gint *r_mouse, gint *g_mouse, gint *b_mouse)
 {
+       GdkPixbuf *pb = pr->pixbuf;
+       gint p_alpha, prs;
+       guchar *p_pix, *pp;
+       gint map_x, map_y, map_w, map_h;
+       
        g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
-       g_return_val_if_fail(width != NULL && height != NULL, FALSE);
+       g_return_val_if_fail(r_mouse != NULL && g_mouse != NULL && b_mouse != NULL, FALSE);
+
+       if (!pr->pixbuf && !pr->source_tiles_enabled)
+               {
+               *r_mouse = -1;
+               *g_mouse = -1;
+               *b_mouse = -1;
+               return FALSE;
+               }
+       
+       if (!pb) return FALSE;
+
+       pr_tile_region_map_orientation(pr->orientation,
+                                       x_pixel, y_pixel,
+                                       pr->image_width, pr->image_height,
+                                       1, 1, /*single pixel */
+                                       &map_x, &map_y,
+                                       &map_w, &map_h);
+
+       if (map_x < 0 || map_x > gdk_pixbuf_get_width(pr->pixbuf) - 1) return  FALSE;
+       if (map_y < 0 || map_y > gdk_pixbuf_get_height(pr->pixbuf) - 1) return  FALSE;
+       
+       p_alpha = gdk_pixbuf_get_has_alpha(pb);
+       prs = gdk_pixbuf_get_rowstride(pb);
+       p_pix = gdk_pixbuf_get_pixels(pb);
+
+       pp = p_pix + map_y * prs + (map_x * (p_alpha ? 4 : 3));
+       *r_mouse = *pp;
+       pp++;
+       *g_mouse = *pp;
+       pp++;
+       *b_mouse = *pp;
+       
+       return TRUE;
+}
+
+gboolean pixbuf_renderer_get_mouse_position(PixbufRenderer *pr, gint *x_pixel_return, gint *y_pixel_return)
+{
+       gint x_pixel, y_pixel, x_pixel_clamped, y_pixel_clamped;
+            
+       g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
+       g_return_val_if_fail(x_pixel_return != NULL && y_pixel_return != NULL, FALSE);
 
        if (!pr->pixbuf && !pr->source_tiles_enabled)
+               {
+               *x_pixel_return = -1;
+               *y_pixel_return = -1;
+               return FALSE;
+               }
+       
+       x_pixel = floor((gdouble)(pr->x_mouse - pr->x_offset + pr->x_scroll) / pr->scale);
+       y_pixel = floor((gdouble)(pr->y_mouse - pr->y_offset + pr->y_scroll) / pr->scale / pr->aspect_ratio);
+       x_pixel_clamped = CLAMP(x_pixel, 0, pr->image_width - 1);
+       y_pixel_clamped = CLAMP(y_pixel, 0, pr->image_height - 1);
+       
+       if(x_pixel != x_pixel_clamped || y_pixel != y_pixel_clamped)
+               {
+               /* mouse is not on pr */
+               x_pixel = y_pixel = -1;
+               }
+
+       *x_pixel_return = x_pixel;
+       *y_pixel_return = y_pixel;
+       
+       return TRUE;
+}
+
+gboolean pixbuf_renderer_get_image_size(PixbufRenderer *pr, gint *width, gint *height)
+{
+       g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
+       g_return_val_if_fail(width != NULL && height != NULL, FALSE);
+
+       if (!pr->pixbuf && !pr->source_tiles_enabled && (!pr->image_width || !pr->image_height))
                {
                *width = 0;
                *height = 0;
@@ -3980,12 +2783,12 @@ gint pixbuf_renderer_get_image_size(PixbufRenderer *pr, gint *width, gint *heigh
        return TRUE;
 }
 
-gint pixbuf_renderer_get_scaled_size(PixbufRenderer *pr, gint *width, gint *height)
+gboolean pixbuf_renderer_get_scaled_size(PixbufRenderer *pr, gint *width, gint *height)
 {
        g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
        g_return_val_if_fail(width != NULL && height != NULL, FALSE);
 
-       if (!pr->pixbuf && !pr->source_tiles_enabled)
+       if (!pr->pixbuf && !pr->source_tiles_enabled && (!pr->image_width || !pr->image_height))
                {
                *width = 0;
                *height = 0;
@@ -3997,7 +2800,7 @@ gint pixbuf_renderer_get_scaled_size(PixbufRenderer *pr, gint *width, gint *heig
        return TRUE;
 }
 
-gint pixbuf_renderer_get_visible_rect(PixbufRenderer *pr, GdkRectangle *rect)
+gboolean pixbuf_renderer_get_visible_rect(PixbufRenderer *pr, GdkRectangle *rect)
 {
        g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
        g_return_val_if_fail(rect != NULL, FALSE);
@@ -4013,13 +2816,13 @@ gint pixbuf_renderer_get_visible_rect(PixbufRenderer *pr, GdkRectangle *rect)
                }
 
        rect->x = (gint)((gdouble)pr->x_scroll / pr->scale);
-       rect->y = (gint)((gdouble)pr->y_scroll / pr->scale);
+       rect->y = (gint)((gdouble)pr->y_scroll / pr->scale / pr->aspect_ratio);
        rect->width = (gint)((gdouble)pr->vis_width / pr->scale);
-       rect->height = (gint)((gdouble)pr->vis_height / pr->scale);
+       rect->height = (gint)((gdouble)pr->vis_height / pr->scale / pr->aspect_ratio);
        return TRUE;
 }
 
-gint pixbuf_renderer_get_virtual_rect(PixbufRenderer *pr, GdkRectangle *rect)
+gboolean pixbuf_renderer_get_virtual_rect(PixbufRenderer *pr, GdkRectangle *rect)
 {
        g_return_val_if_fail(IS_PIXBUF_RENDERER(pr), FALSE);
        g_return_val_if_fail(rect != NULL, FALSE);
@@ -4040,4 +2843,26 @@ gint pixbuf_renderer_get_virtual_rect(PixbufRenderer *pr, GdkRectangle *rect)
        return TRUE;
 }
 
+void pixbuf_renderer_set_size_early(PixbufRenderer *pr, guint width, guint height)
+{
+#if 0
+       /* FIXME: this function does not consider the image orientation,
+       so it probably only breaks something */
+       gdouble zoom;
+       gint w, h;
+
+       zoom = pixbuf_renderer_zoom_get(pr);
+       pr->image_width = width;
+       pr->image_height = height;
+
+       pr_zoom_clamp(pr, zoom, PR_ZOOM_FORCE, NULL);
+
+       //w = width;
+       //h = height;
+
+       //pr->width = width;
+       //pr->height = height;
+#endif
+}
 
+/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */