X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fpng2swf.c;h=47369398a122f4b69e7670b63ae74089ac883b26;hb=287d3c4c457dcbe7b7dc1ddc3a63cc80cd390e71;hp=0bf05a997a3e8a0192ac83de23382c893811c4d4;hpb=7d7f33d0eef497e686670e1bf0691d239131cfb3;p=swftools.git

diff --git a/src/png2swf.c b/src/png2swf.c
index 0bf05a9..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;
@@ -152,8 +153,8 @@ int png_read_header(FILE*fi, struct png_header*header)
 		fprintf(stderr, "Image mode %d not supported!\n", b);
 		exit(1);
 	    }
-	    if(a!=8) {
-		fprintf(stderr, "Bpp %d not supported!\n", a);
+	    if(a!=8 && b==2) {
+		fprintf(stderr, "Bpp %d in mode %d not supported!\n", a);
 		exit(1);
 	    }
 	    if(c!=0) {
@@ -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;
 
@@ -375,21 +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);
     }
+    
+    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);
 
-    t = swf_InsertTag(t, ST_DEFINEBITSLOSSLESS);
     swf_SetU16(t, id);		// id
     if(header.mode == 2) {
 	U8*data2 = malloc(header.width*header.height*4);
@@ -399,10 +429,21 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	/* 24->32 bit conversion */
 	for(y=0;y<header.height;y++) {
 	    int mode = imagedata[pos++]; //filter mode
-
-	    U8*src = &imagedata[pos];
-	    U8*dest = &data2[(y*header.width)*4];
+	    U8*src;
+	    U8*dest;
 	    U8*old;
+	    dest = &data2[(y*header.width)*4];
+
+	    if(header.bpp == 8)
+	    {
+		/* one byte per pixel */
+		src = &imagedata[pos];
+		pos+=header.width*3;
+	    } else {
+		/* not implemented yet */
+		exit(1);
+	    }
+
 	    if(!y) {
 		memset(data2,0,header.width*4);
 		old = &data2[y*header.width*4];
@@ -410,7 +451,6 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 		old = &data2[(y-1)*header.width*4];
 	    }
 	    applyfilter(mode, src, old, dest, header.width);
-	    pos+=header.width*3;
 	}
 	swf_SetLosslessBits(t, header.width, header.height, data2, BMF_32BIT);
 	free(data2);
@@ -419,6 +459,7 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	RGBA*rgba = (RGBA*)malloc(palettelen*sizeof(RGBA));
 	int swf_width = BYTES_PER_SCANLINE(header.width);
 	U8*data2 = malloc(swf_width*header.height);
+	U8*tmpline = malloc(header.width);
 	int i,x,y;
 	int pos=0;
 	if(!palette) {
@@ -430,13 +471,43 @@ 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*src = &imagedata[pos];
-	    U8*dest = &data2[y*swf_width];
 	    U8*old;
+	    U8*dest = &data2[y*swf_width];
+	    U8*src;
+	    src = &imagedata[pos];
+	    if(header.bpp == 8) {
+		pos+=header.width;
+	    } else {
+		int x,s=0;
+		int bitpos = 0;
+		U32 v = (1<<header.bpp)-1;
+		for(x=0;x<header.width;x++) {
+		    U32 r = src[s/8]<<8 | 
+			    src[s/8+1];
+		    int t;
+		    tmpline[x] = (r>>(16-header.bpp-(s&7)))&v;
+		    s+=header.bpp;
+		}
+		src = tmpline;
+		pos+=(header.width*header.bpp+7)/8;
+	    }
+
 	    if(!y) {
 		memset(data2,0,swf_width);
 		old = &data2[y*swf_width];
@@ -444,9 +515,9 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 		old = &data2[(y-1)*swf_width];
 	    }
 	    applyfilter1(mode, src, old, dest, header.width);
-	    pos+=header.width;
 	}
 	swf_SetLosslessBitsIndexed(t, header.width, header.height, data2, rgba, palettelen);
+	free(tmpline);
 	free(rgba);
 	free(data2);
     }
@@ -654,6 +725,9 @@ int main(int argc, char **argv)
 
     processargs(argc, argv);
 
+    if(global.nfiles<=0)
+	return 1;
+
     if (VERBOSE(2))
 	fprintf(stderr, "Processing %i file(s)...\n", global.nfiles);