Dissolve

diff --git a/io-xcf.c b/io-xcf.c
index 5e7e77a..d04fd3c 100644 (file)
--- a/io-xcf.c
+++ b/io-xcf.c
@@ -33,6 +33,7 @@
 #include <gdk-pixbuf/gdk-pixbuf-io.h>
 #include <math.h>
 #include <string.h>
+#include <stdlib.h>
 #include <errno.h>
 
 #define LOG(...) printf (__VA_ARGS__);
@@ -391,6 +392,19 @@ composite (gchar *pixbuf_pixels, int rowstride, gchar *tile_pixels, int ox, int
                                dest[3] = alpha;
                        }
                break;
+       case LAYERMODE_DISSOLVE:
+               srand(time(0));
+               for (j=0;j<th;j++)
+                       for (i=0;i<tw;i++) {
+                               guchar *dest = pixbuf_pixels + origin + j * rowstride + 4 * i;
+                               guchar *src = tile_pixels + j*tw*4 + i*4;
+                               guchar d = rand () % 0x100;
+                               dest [0] = d <= src[3] ? src[0] : dest[0];
+                               dest [1] = d <= src[3] ? src[1] : dest[1];
+                               dest [2] = d <= src[3] ? src[2] : dest[2];
+                               dest [3] = d <= src[3] ? 0xff : dest[3];
+                       }
+               break;
        case LAYERMODE_BEHIND: //ignore
                break;
        // 3<=mode<=10 || 15<=mode<=21
@@ -552,8 +566,6 @@ composite (gchar *pixbuf_pixels, int rowstride, gchar *tile_pixels, int ox, int
                        }
                break;
 
-       case LAYERMODE_DISSOLVE:
-
        case LAYERMODE_HUE:
        case LAYERMODE_SATURATION:
        case LAYERMODE_COLOR: