fixed a bug which appeared when the first line was encoded using

a PaethPredictor.

diff --git a/src/png2swf.c b/src/png2swf.c
index fe46551..989e3ba 100644 (file)
--- a/src/png2swf.c
+++ b/src/png2swf.c
@@ -542,6 +542,8 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
        int transparent=0;
        int semitransparent=0;
        /* in case for mode 2, the following also performs 24->32 bit conversion */
+       unsigned char* firstline = malloc(header.width*4);
+
        for(y=0;y<header.height;y++) {
            int mode = imagedata[pos++]; //filter mode
            U8*src;
@@ -560,8 +562,8 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
            }
 
            if(!y) {
-               memset(data2,0,header.width*4);
-               old = &data2[y*header.width*4];
+               old = firstline;
+               memset(old, 0, header.width*4);
            } else {
                old = &data2[(y-1)*header.width*4];
            }
@@ -570,6 +572,7 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
            else if(header.mode==2)
                applyfilter3(mode, src, old, dest, header.width);
        }
+       free(firstline);
 
        /* the image is now compressed and stored in data. Now let's take
           a look at the alpha values to determine which bitmap type we