X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Fpng.c;h=8578d2dbee85551bca002de752f55abe85312b2f;hb=fe03062883881dcd0e1b8d65d676433d17973477;hp=739b8958de6ab3b0bfc041b1a1d2262ea3ea53ff;hpb=2ca40471be05851582e72ff47189fa4164ff329a;p=swftools.git

diff --git a/lib/png.c b/lib/png.c
index 739b895..8578d2d 100644
--- a/lib/png.c
+++ b/lib/png.c
@@ -99,7 +99,7 @@ static int png_read_header(FILE*fi, struct png_header*header)
     unsigned char*data;
     fread(head2,8,1,fi);
     if(strncmp((const char*)head,(const char*)head2,4))
-	return 0;
+	return 0; // not a png file
     
     while(png_read_chunk(&id, &len, &data, fi))
     {
@@ -197,6 +197,7 @@ static void applyfilter1(int mode, unsigned char*src, unsigned char*old, unsigne
     else if(mode==3) {
 	for(x=0;x<width;x++) {
 	    *dest = *src+(*old+last)/2;
+	    last = *dest;
 	    dest++;
 	    old++;
 	    src++;
@@ -448,7 +449,6 @@ EXPORT int getPNGdimensions(const char*sname, int*destwidth, int*destheight)
 	return 0;
     }
     if(!png_read_header(fi, &header)) {
-	fprintf(stderr, "Error reading header from file %s\n", sname);
 	return 0;
     }
 
@@ -485,7 +485,6 @@ EXPORT int getPNG(const char*sname, int*destwidth, int*destheight, unsigned char
     }
 
     if(!png_read_header(fi, &header)) {
-	printf("Error reading header from file %s\n", sname);
 	return 0;
     }