fixed various problems with preserving viewport on image change,

[geeqie.git] / src / pixbuf-renderer.c

diff --git a/src/pixbuf-renderer.c b/src/pixbuf-renderer.c
index d4427d9..bb25a03 100644 (file)
--- a/src/pixbuf-renderer.c
+++ b/src/pixbuf-renderer.c
@@ -511,6 +511,9 @@ static void pixbuf_renderer_init(PixbufRenderer *pr)
 
        pr->orientation = 1;
 
+       pr->norm_center_x = 0.5;
+       pr->norm_center_y = 0.5;
+
        gtk_widget_set_double_buffered(box, FALSE);
        g_signal_connect_after(G_OBJECT(box), "size_allocate",
                               G_CALLBACK(pr_size_cb), pr);
@@ -3093,6 +3096,19 @@ static void pr_drag_signal(PixbufRenderer *pr, GdkEventButton *bevent)
  *-------------------------------------------------------------------
  */
 
+static void pixbuf_renderer_sync_scroll_center(PixbufRenderer *pr)
+{
+       gint src_x, src_y;
+       if (!pr->width || !pr->height) return;
+
+       src_x = pr->x_scroll + pr->vis_width / 2;
+       src_y = pr->y_scroll + pr->vis_height / 2;
+
+       pr->norm_center_x = (gdouble)src_x / pr->width;
+       pr->norm_center_y = (gdouble)src_y / pr->height;
+}
+
+
 static gint pr_scroll_clamp(PixbufRenderer *pr)
 {
        gint old_xs;
@@ -3127,6 +3143,8 @@ 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);
 }
 
@@ -3159,6 +3177,8 @@ static gint pr_size_clamp(PixbufRenderer *pr)
                pr->y_offset = 0;
                }
 
+       pixbuf_renderer_sync_scroll_center(pr);
+
        return (old_vw != pr->vis_width || old_vh != pr->vis_height);
 }
 
@@ -3268,6 +3288,8 @@ static gint pr_zoom_clamp(PixbufRenderer *pr, gdouble zoom,
                }
        if (redrawn) *redrawn = (invalidate || invalid);
 
+       pixbuf_renderer_sync_scroll_center(pr);
+
        return TRUE;
 }
 
@@ -3283,7 +3305,9 @@ static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
        gboolean force = !!(flags & PR_ZOOM_FORCE);
        gboolean new = !!(flags & PR_ZOOM_NEW);
        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)
                {
@@ -3310,7 +3334,9 @@ static void pr_zoom_sync(PixbufRenderer *pr, gdouble zoom,
                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->vis_height / 2;
                                break;
                        case PR_SCROLL_RESET_CENTER:
                                /* center new image */
@@ -3461,6 +3487,9 @@ 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);
@@ -3576,20 +3605,8 @@ 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;
-
-       if (pr->width)
-               *x = (gdouble)src_x / pr->width;
-       else
-               *x = 0.5; /* center */
-               
-       if (pr->height)
-               *y = (gdouble)src_y / pr->height;
-       else
-               *y = 0.5; /* center */
+       *x = pr->norm_center_x;
+       *y = pr->norm_center_y;
 }
 
 void pixbuf_renderer_set_scroll_center(PixbufRenderer *pr, gdouble x, gdouble y)