X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=src%2Fpng2swf.c;h=927504e16982354206fe05dbe2bf2ae919eafe81;hp=9092aacd6ff6f374835625ff656064cb9d4da96e;hb=0e8807d9a620e8932bc67653321eaae1436fdd43;hpb=f7b166f46c40c7e67fe89fef3379a649df5e8b4d

diff --git a/src/png2swf.c b/src/png2swf.c
index 9092aac..927504e 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;
@@ -148,11 +149,11 @@ int png_read_header(FILE*fi, struct png_header*header)
 	    f = data[11];     // filter mode (0)
 	    i = data[12];     // interlace mode (0)
 
-	    if(b!=2 && b!=3) {
+	    if(b!=2 && b!=3 && b!=6) {
 		fprintf(stderr, "Image mode %d not supported!\n", b);
 		exit(1);
 	    }
-	    if(a!=8 && b==2) {
+	    if(a!=8 && (b==2 || b==6)) {
 		fprintf(stderr, "Bpp %d in mode %d not supported!\n", a);
 		exit(1);
 	    }
@@ -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;
@@ -199,7 +199,7 @@ byte inline PaethPredictor (byte a,byte b,byte c)
         else return c;
 }
 
-void applyfilter(int mode, U8*src, U8*old, U8*dest, int width)
+void applyfilter3(int mode, U8*src, U8*old, U8*dest, int width)
 {
     int x;
     unsigned char lastr=0;
@@ -277,6 +277,89 @@ void applyfilter(int mode, U8*src, U8*old, U8*dest, int width)
 
 }
 
+void applyfilter4(int mode, U8*src, U8*old, U8*dest, int width)
+{
+    int x;
+    unsigned char lastr=0;
+    unsigned char lastg=0;
+    unsigned char lastb=0;
+    unsigned char lasta=0;
+    unsigned char upperlastr=0;
+    unsigned char upperlastg=0;
+    unsigned char upperlastb=0;
+    unsigned char upperlasta=0;
+
+    if(mode==0) {
+	for(x=0;x<width;x++) {
+	    dest[0] = src[3];
+	    dest[1] = src[0];
+	    dest[2] = src[1];
+	    dest[3] = src[2];
+	    dest+=4;
+	    src+=4;
+	}
+    }
+    else if(mode==1) {
+	for(x=0;x<width;x++) {
+	    dest[0] = src[3]+lasta;
+	    dest[1] = src[0]+lastr;
+	    dest[2] = src[1]+lastg;
+	    dest[3] = src[2]+lastb;
+	    lasta = dest[0];
+	    lastr = dest[1];
+	    lastg = dest[2];
+	    lastb = dest[3];
+	    dest+=4;
+	    src+=4;
+	}
+    }
+    else if(mode==2) {
+	for(x=0;x<width;x++) {
+	    dest[0] = src[3]+old[0];
+	    dest[1] = src[0]+old[1];
+	    dest[2] = src[1]+old[2];
+	    dest[3] = src[2]+old[3];
+	    dest+=4;
+	    old+=4;
+	    src+=4;
+	}
+    }
+    else if(mode==3) {
+	for(x=0;x<width;x++) {
+	    dest[0] = src[3]+(old[0]+lasta)/2;
+	    dest[1] = src[0]+(old[1]+lastr)/2;
+	    dest[2] = src[1]+(old[2]+lastg)/2;
+	    dest[3] = src[2]+(old[3]+lastb)/2;
+	    lastr = dest[1];
+	    lastg = dest[2];
+	    lastb = dest[3];
+	    dest+=4;
+	    old+=4;
+	    src+=4;
+	}
+    }
+    else if(mode==4) {
+	for(x=0;x<width;x++) {
+	    dest[0] = src[3]+PaethPredictor(lasta,old[0],upperlasta);
+	    dest[1] = src[0]+PaethPredictor(lastr,old[1],upperlastr);
+	    dest[2] = src[1]+PaethPredictor(lastg,old[2],upperlastg);
+	    dest[3] = src[2]+PaethPredictor(lastb,old[3],upperlastb);
+	    lasta = dest[0];
+	    lastr = dest[1];
+	    lastg = dest[2];
+	    lastb = dest[3];
+	    upperlastr = old[0];
+	    upperlastr = old[1];
+	    upperlastg = old[2];
+	    upperlastb = old[3];
+	    dest+=4;
+	    old+=4;
+	    src+=4;
+	}
+    }    
+
+}
+
 void applyfilter1(int mode, U8*src, U8*old, U8*dest, int width)
 {
     int x;
@@ -338,9 +421,13 @@ 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;
 
@@ -360,6 +447,8 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
     else
     if(header.mode == 2) bypp = 3;
     else
+    if(header.mode == 6) bypp = 4;
+    else
 	return 0;
     imagedatalen = bypp * header.width * header.height + 65536;
     imagedata = malloc(imagedatalen);
@@ -375,27 +464,54 @@ 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) {
+    if(header.mode == 2 || header.mode == 6) {
 	U8*data2 = malloc(header.width*header.height*4);
 	int i,s=0;
 	int x,y;
 	int pos=0;
-	/* 24->32 bit conversion */
+	/* in case for mode 2, the following also performs 24->32 bit conversion */
 	for(y=0;y<header.height;y++) {
 	    int mode = imagedata[pos++]; //filter mode
 	    U8*src;
@@ -407,7 +523,7 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	    {
 		/* one byte per pixel */
 		src = &imagedata[pos];
-		pos+=header.width*3;
+		pos+=header.width*(header.mode==6?4:3);
 	    } else {
 		/* not implemented yet */
 		exit(1);
@@ -419,7 +535,10 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	    } else {
 		old = &data2[(y-1)*header.width*4];
 	    }
-	    applyfilter(mode, src, old, dest, header.width);
+	    if(header.mode==6)
+		applyfilter4(mode, src, old, dest, header.width);
+	    else
+		applyfilter3(mode, src, old, dest, header.width);
 	}
 	swf_SetLosslessBits(t, header.width, header.height, data2, BMF_32BIT);
 	free(data2);
@@ -440,8 +559,20 @@ 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;