Wed Apr 6 02:43:40 2005 John Ellis <johne@verizon.net>

[geeqie.git] / src / pan-view.c

diff --git a/src/pan-view.c b/src/pan-view.c
index bf07e3a..2284def 100644 (file)
--- a/src/pan-view.c
+++ b/src/pan-view.c
@@ -435,7 +435,11 @@ static void pixbuf_draw_triangle(GdkPixbuf *pb,
        guchar *p_pix;
        guchar *pp;
        gint p_step;
-       gint i, j;
+       gdouble slope1, slope2;
+       gint slope1_x, slope1_y;
+       gint y;
+       gint t;
+       gint middle = FALSE;
 
        if (!pb) return;
 
@@ -460,26 +464,68 @@ static void pixbuf_draw_triangle(GdkPixbuf *pb,
        p_pix = gdk_pixbuf_get_pixels(pb);
 
        p_step = (p_alpha) ? 4 : 3;
-       for (i = fy1; i < fy2; i++)
+
+       if (y1 > y2)
+               {
+               t = x1; x1 = x2; x2 = t;
+               t = y1; y1 = y2; y2 = t;
+               }
+       if (y2 > y3)
+               {
+               t = x2; x2 = x3; x3 = t;
+               t = y2; y2 = y3; y3 = t;
+               }
+       if (y1 > y2)
+               {
+               t = x1; x1 = x2; x2 = t;
+               t = y1; y1 = y2; y2 = t;
+               }
+
+       slope1 = (gdouble)(y2 - y1);
+       if (slope1) slope1 = (gdouble)(x2 - x1) / slope1;
+       slope1_x = x1;
+       slope1_y = y1;
+       slope2 = (gdouble)(y3 - y1);
+       if (slope2) slope2 = (gdouble)(x3 - x1) / slope2;
+
+       for (y = fy1; y < fy2; y++)
                {
-               pp = p_pix + i * prs + (fx1 * p_step);
-               for (j = fx1; j < fx2; j++)
+               gint xa, xb;
+
+               if (!middle && y > y2)
                        {
-                       gint z1, z2;
+                       slope1 = (gdouble)(y3 - y2);
+                       if (slope1) slope1 = (gdouble)(x3 - x2) / slope1;
+                       slope1_x = x2;
+                       slope1_y = y2;
 
-                       z1 = (y1 - y2)*(j - x2) + (x2 - x1)*(i - y2);
-                       z2 = (y2 - y3)*(j - x3) + (x3 - x2)*(i - y3);
-                       if ((z1 ^ z2) >= 0)
-                               {
-                               z2 = (y3 - y1)*(j - x1) + (x1 - x3)*(i - y1);
-                               if ((z1 ^ z2) >= 0)
-                                       {
-                                       pp[0] = (r * a + pp[0] * (256-a)) >> 8;
-                                       pp[1] = (g * a + pp[1] * (256-a)) >> 8;
-                                       pp[2] = (b * a + pp[2] * (256-a)) >> 8;
-                                       }
-                               }
-                       pp += p_step;
+                       middle = TRUE;
+                       }
+
+               xa = slope1_x + ((gdouble)slope1 * (y - slope1_y) + 0.5);
+               xb = x1 + ((gdouble)slope2 * (y - y1) + 0.5);
+
+               if (xa > xb)
+                       {
+                       t = xa; xa = xb; xb = t;
+                       }
+
+               xa = CLAMP(xa, fx1, fx2);
+               xb = CLAMP(xb, fx1, fx2);
+
+               pp = p_pix + y * prs + xa * p_step;
+
+               while (xa < xb)
+                       {
+                       *pp = (r * a + *pp * (256-a)) >> 8;
+                       pp++;
+                       *pp = (g * a + *pp * (256-a)) >> 8;
+                       pp++;
+                       *pp = (b * a + *pp * (256-a)) >> 8;
+                       pp++;
+                       if (p_alpha) pp++;
+
+                       xa++;
                        }
                }
 }
@@ -495,14 +541,8 @@ static gint util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdoub
                {
                gdouble t;
 
-               t = x1;
-               x1 = x2;
-               x2 = t;
-
-               t = y1;
-               y1 = y2;
-               y2 = t;
-
+               t = x1; x1 = x2; x2 = t;
+               t = y1; y1 = y2; y2 = t;
                flip = TRUE;
                }
 
@@ -559,14 +599,8 @@ static gint util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdoub
 
                if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
 
-               t = x1;
-               x1 = x2;
-               x2 = t;
-
-               t = y1;
-               y1 = y2;
-               y2 = t;
-
+               t = x1; x1 = x2; x2 = t;
+               t = y1; y1 = y2; y2 = t;
                flip = !flip;
                }
 
@@ -3322,6 +3356,8 @@ static gint pan_window_layout_update_idle_cb(gpointer data)
                {
                gdouble align;
 
+               printf("Canvas size is %d x %d\n", width, height);
+
                pixbuf_renderer_set_tiles(PIXBUF_RENDERER(pw->imd->pr), width, height,
                                          PAN_TILE_SIZE, PAN_TILE_SIZE, 10,
                                          pan_window_request_tile_cb,