added a small optimization to swf_ImageGetNumberOfPaletteEntries().

diff --git a/lib/modules/swfbits.c b/lib/modules/swfbits.c
index 57350da..a8b3e1f 100644 (file)
--- a/lib/modules/swfbits.c
+++ b/lib/modules/swfbits.c
@@ -36,29 +36,40 @@ int swf_ImageHasAlpha(RGBA*img, int width, int height)
     }
     return hasalpha;
 }
-   
+
 int swf_ImageGetNumberOfPaletteEntries(RGBA*img, int width, int height, RGBA*palette)
 {
     int len = width*height;
     int t;
     int palsize = 0;
-    RGBA pal[256];
+    RGBA pal[512];
+    U32*pal32=(U32*)pal;
     int palette_overflow = 0;
-    for(t=0;t<len;t++) {
+    U32 lastcol32 = 0;
+
+    if(sizeof(RGBA)!=sizeof(U32))
+       fprintf(stderr, "rfxswf: sizeof(RGBA)!=sizeof(U32))");
+
+    lastcol32 = pal32[palsize++] = *(U32*)&img[0];
+
+    for(t=1;t<len;t++) {
        RGBA col = img[t];
        U32 col32 = *(U32*)&img[t];
-       int i=0;
+       int i;
+       if(col32==lastcol32)
+           continue;
        for(i=0;i<palsize;i++) {
-           if(col32 == *(U32*)&pal[i])
+           if(col32 == pal32[i])
                break;
        }
        if(i==palsize) {
-           if(palsize==256) {
+           if(palsize==512) {
                palette_overflow = 1;
                break;
            }
-           pal[palsize++] = col;
+           pal32[palsize++] = col32;
        }
+       lastcol32 = col32;
     }
     if(palette_overflow)
        return width*height;