X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fpng2swf.c;h=47369398a122f4b69e7670b63ae74089ac883b26;hb=287d3c4c457dcbe7b7dc1ddc3a63cc80cd390e71;hp=9092aacd6ff6f374835625ff656064cb9d4da96e;hpb=f7b166f46c40c7e67fe89fef3379a649df5e8b4d;p=swftools.git

diff --git a/src/png2swf.c b/src/png2swf.c
index 9092aac..4736939 100644
--- a/src/png2swf.c
+++ b/src/png2swf.c
@@ -125,6 +125,7 @@ int png_read_header(FILE*fi, struct png_header*header)
 {
     char id[4];
     int len;
+    int ok=0;
     U8 head[8] = {137,80,78,71,13,10,26,10};
     U8 head2[8];
     U8*data;
@@ -172,13 +173,12 @@ int png_read_header(FILE*fi, struct png_header*header)
 		printf("%dx%d %d %d %d %d %d\n",header->width, header->height, a,b,c,f,i);
 	    header->bpp = a;
 	    header->mode = b;
-	    return 1;
-	} else {
-	    fseek(fi, len, SEEK_CUR);
-	}
+	    ok = 1;
+	} 
+	
 	free(data);
     }
-    return 0;
+    return ok;
 }
 
 typedef unsigned char byte;
@@ -338,9 +338,13 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
     int len;
     U8*data;
     U8*imagedata;
+    U8*zimagedata=0;
     unsigned long int imagedatalen;
+    unsigned long int zimagedatalen=0;
     U8*palette = 0;
     int palettelen = 0;
+    U8*alphapalette = 0;
+    int alphapalettelen = 0;
     struct png_header header;
     int bypp;
 
@@ -375,20 +379,47 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	if(!strncmp(tagid, "PLTE", 4)) {
 	    palette = data;
 	    palettelen = len/3;
-	    data = 0;
+	    data = 0; //don't free data
 	    if(VERBOSE(2))
 		printf("%d colors in palette\n", palettelen);
 	}
+	if(!strncmp(tagid, "tRNS", 4)) {
+	    if(header.mode == 3) {
+		alphapalette = data;
+		alphapalettelen = len;
+		data = 0; //don't free data
+		if(VERBOSE(2))
+		    printf("found %d alpha colors\n", alphapalettelen);
+	    }
+	}
 	if(!strncmp(tagid, "IDAT", 4)) {
-	    if(uncompress(imagedata, &imagedatalen, data, len) != Z_OK) {
-		fprintf(stderr, "Couldn't uncompress %s!\n", sname);
-		return 0;
+	    if(!zimagedata) {
+		zimagedatalen = len;
+		zimagedata = malloc(len);
+		memcpy(zimagedata,data,len);
+	    } else {
+		zimagedata = realloc(zimagedata, zimagedatalen+len);
+		memcpy(&zimagedata[zimagedatalen], data, len);
+		zimagedatalen += len;
 	    }
 	}
 	if(data)
 	    free(data);
     }
-    t = swf_InsertTag(t, ST_DEFINEBITSLOSSLESS);
+    
+    if(!zimagedata || uncompress(imagedata, &imagedatalen, zimagedata, zimagedatalen) != Z_OK) {
+	fprintf(stderr, "Couldn't uncompress %s!\n", sname);
+	if(zimagedata)
+	    free(zimagedata);
+	return 0;
+    }
+    free(zimagedata);
+
+    if(alphapalette)
+	t = swf_InsertTag(t, ST_DEFINEBITSLOSSLESS2);
+    else
+	t = swf_InsertTag(t, ST_DEFINEBITSLOSSLESS);
+
     swf_SetU16(t, id);		// id
     if(header.mode == 2) {
 	U8*data2 = malloc(header.width*header.height*4);
@@ -440,8 +471,20 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	    rgba[i].r = palette[i*3+0];
 	    rgba[i].g = palette[i*3+1];
 	    rgba[i].b = palette[i*3+2];
-	    rgba[i].a = 255;
+	    if(alphapalette && i<alphapalettelen) {
+		rgba[i].a = alphapalette[i];
+		if(alphapalette[i] == 0) {
+		    /* if the color is fully transparent, it doesn't matter
+		       what it's rgb values are. furthermore, all Flash 
+		       players up to Flash 5 can't deal with anything beyond
+		       one transparent color with value (00,00,00,00). */
+		    rgba[i].r = rgba[i].g = rgba[i].b = 0;
+		}
+	    } else {
+		rgba[i].a = 255;
+	    }
 	}
+
 	for(y=0;y<header.height;y++) {
 	    int mode = imagedata[pos++]; //filter mode
 	    U8*old;