X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fpng2swf.c;h=0bf05a997a3e8a0192ac83de23382c893811c4d4;hb=65d0117e4931bf503885113a2c79ccd2493a7697;hp=d294426fc73722f7dade819468e103069aa5dd83;hpb=f844ee2a4a4cd5154936e79d036593d941561a26;p=swftools.git

diff --git a/src/png2swf.c b/src/png2swf.c
index d294426..0bf05a9 100644
--- a/src/png2swf.c
+++ b/src/png2swf.c
@@ -87,7 +87,6 @@ int png_read_chunk(char (*head)[4], int*destlen, U8**destdata, FILE*fi)
     if(!fread(head, 4, 1, fi))
 	return 0;
     len = REVERSESWAP32(len);
-    printf("id: %.4s len: %d\n", head, len);
     if(destlen) *destlen = len;
     if(destdata) {
 	if(len)
@@ -135,7 +134,8 @@ int png_read_header(FILE*fi, struct png_header*header)
    
     while(png_read_chunk(&id, &len, &data, fi))
     {
-	printf("%c%c%c%c %d\n", id[0],id[1],id[2],id[3],len);
+	if(VERBOSE(2))
+	    printf("%c%c%c%c %d\n", id[0],id[1],id[2],id[3],len);
 	if(!strncasecmp(id, "IHDR", 4)) {
 	    char a,b,c,f,i;
 	    if(len < 8) exit(1);
@@ -147,7 +147,29 @@ int png_read_header(FILE*fi, struct png_header*header)
 	    c = data[10];     // compression mode (0)
 	    f = data[11];     // filter mode (0)
 	    i = data[12];     // interlace mode (0)
-	    printf("%08xx%08x %d %d %d %d %d\n",header->width, header->height, a,b,c,f,i);
+
+	    if(b!=2 && b!=3) {
+		fprintf(stderr, "Image mode %d not supported!\n", b);
+		exit(1);
+	    }
+	    if(a!=8) {
+		fprintf(stderr, "Bpp %d not supported!\n", a);
+		exit(1);
+	    }
+	    if(c!=0) {
+		fprintf(stderr, "Compression mode %d not supported!\n", c);
+		exit(1);
+	    }
+	    if(f!=0) {
+		fprintf(stderr, "Filter mode %d not supported!\n", f);
+		exit(1);
+	    }
+	    if(i!=0) {
+		fprintf(stderr, "Interlace mode %d not supported!\n", i);
+		exit(1);
+	    }
+	    if(VERBOSE(2))
+		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;
@@ -159,6 +181,152 @@ int png_read_header(FILE*fi, struct png_header*header)
     return 0;
 }
 
+typedef unsigned char byte;
+#define ABS(a) ((a)>0?(a):(-(a)))
+byte inline PaethPredictor (byte a,byte b,byte c)
+{
+        // a = left, b = above, c = upper left
+        int p = a + b - c;        // initial estimate
+        int pa = ABS(p - a);      // distances to a, b, c
+        int pb = ABS(p - b);
+        int pc = ABS(p - c);
+        // return nearest of a,b,c,
+        // breaking ties in order a,b,c.
+        if (pa <= pb && pa <= pc) 
+		return a;
+        else if (pb <= pc) 
+		return b;
+        else return c;
+}
+
+void applyfilter(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 upperlastr=0;
+    unsigned char upperlastg=0;
+    unsigned char upperlastb=0;
+
+    if(mode==0) {
+	for(x=0;x<width;x++) {
+	    dest[0] = 255;
+	    dest[1] = src[0];
+	    dest[2] = src[1];
+	    dest[3] = src[2];
+	    dest+=4;
+	    src+=3;
+	}
+    }
+    else if(mode==1) {
+	for(x=0;x<width;x++) {
+	    dest[0] = 255;
+	    dest[1] = src[0]+lastr;
+	    dest[2] = src[1]+lastg;
+	    dest[3] = src[2]+lastb;
+	    lastr = dest[1];
+	    lastg = dest[2];
+	    lastb = dest[3];
+	    dest+=4;
+	    src+=3;
+	}
+    }
+    else if(mode==2) {
+	for(x=0;x<width;x++) {
+	    dest[0] = 255;
+	    dest[1] = src[0]+old[1];
+	    dest[2] = src[1]+old[2];
+	    dest[3] = src[2]+old[3];
+	    dest+=4;
+	    old+=4;
+	    src+=3;
+	}
+    }
+    else if(mode==3) {
+	for(x=0;x<width;x++) {
+	    dest[0] = 255;
+	    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+=3;
+	}
+    }
+    else if(mode==4) {
+	for(x=0;x<width;x++) {
+	    dest[0] = 255;
+	    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);
+	    lastr = dest[1];
+	    lastg = dest[2];
+	    lastb = dest[3];
+	    upperlastr = old[1];
+	    upperlastg = old[2];
+	    upperlastb = old[3];
+	    dest+=4;
+	    old+=4;
+	    src+=3;
+	}
+    }    
+
+}
+
+void applyfilter1(int mode, U8*src, U8*old, U8*dest, int width)
+{
+    int x;
+    unsigned char last=0;
+    unsigned char upperlast=0;
+
+    if(mode==0) {
+	for(x=0;x<width;x++) {
+	    *dest = *src;
+	    dest++;
+	    src++;
+	}
+    }
+    else if(mode==1) {
+	for(x=0;x<width;x++) {
+	    *dest = *src+last;
+	    last = *dest;
+	    dest++;
+	    src++;
+	}
+    }
+    else if(mode==2) {
+	for(x=0;x<width;x++) {
+	    *dest = *src+*old;
+	    dest++;
+	    old++;
+	    src++;
+	}
+    }
+    else if(mode==3) {
+	for(x=0;x<width;x++) {
+	    *dest = *src+(*old+last)/2;
+	    dest++;
+	    old++;
+	    src++;
+	}
+    }
+    else if(mode==4) {
+	for(x=0;x<width;x++) {
+	    *dest = *src+PaethPredictor(last,*old,upperlast);
+	    last = *dest;
+	    upperlast = *old;
+	    dest++;
+	    old++;
+	    src++;
+	}
+    }    
+
+}
+
 TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 {
     SHAPE *s;
@@ -171,8 +339,8 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
     U8*data;
     U8*imagedata;
     unsigned long int imagedatalen;
-    U8*palette;
-    int palettelen;
+    U8*palette = 0;
+    int palettelen = 0;
     struct png_header header;
     int bypp;
 
@@ -208,14 +376,14 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	    palette = data;
 	    palettelen = len/3;
 	    data = 0;
-	    printf("%d palette\n", len);
+	    if(VERBOSE(2))
+		printf("%d colors in palette\n", palettelen);
 	}
 	if(!strncmp(tagid, "IDAT", 4)) {
 	    if(uncompress(imagedata, &imagedatalen, data, len) != Z_OK) {
 		fprintf(stderr, "Couldn't uncompress %s!\n", sname);
 		return 0;
 	    }
-	    printf("IDAT %d -> %d\n", len, imagedatalen);
 	}
 	if(data)
 	    free(data);
@@ -230,25 +398,33 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	int pos=0;
 	/* 24->32 bit conversion */
 	for(y=0;y<header.height;y++) {
-	    pos++; // filter mode
-	    for(x=0;x<header.width;x++) {
-		U8*src  = &imagedata[pos];
-		U8*dest = &data2[(y*header.width+x)*4];
-		dest[0] = 255;
-		dest[1] = src[0];
-		dest[2] = src[1];
-		dest[3] = src[2];
-		pos+=3;
+	    int mode = imagedata[pos++]; //filter mode
+
+	    U8*src = &imagedata[pos];
+	    U8*dest = &data2[(y*header.width)*4];
+	    U8*old;
+	    if(!y) {
+		memset(data2,0,header.width*4);
+		old = &data2[y*header.width*4];
+	    } else {
+		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);
     }
     else {
 	RGBA*rgba = (RGBA*)malloc(palettelen*sizeof(RGBA));
-	U8*data2 = malloc((header.width+4)*header.height);
+	int swf_width = BYTES_PER_SCANLINE(header.width);
+	U8*data2 = malloc(swf_width*header.height);
 	int i,x,y;
 	int pos=0;
+	if(!palette) {
+	    fprintf(stderr, "Error: No palette found!\n");
+	    exit(1);
+	}
 	/* 24->32 bit conversion */
 	for(i=0;i<palettelen;i++) {
 	    rgba[i].r = palette[i*3+0];
@@ -257,11 +433,18 @@ TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 	    rgba[i].a = 255;
 	}
 	for(y=0;y<header.height;y++) {
-	    pos++; //filter mode
-	    for(x=0;x<header.width;x++) {
-		data2[y*header.width+x] = 
-		    imagedata[pos++];
+	    int mode = imagedata[pos++]; //filter mode
+	    U8*src = &imagedata[pos];
+	    U8*dest = &data2[y*swf_width];
+	    U8*old;
+	    if(!y) {
+		memset(data2,0,swf_width);
+		old = &data2[y*swf_width];
+	    } else {
+		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(rgba);
@@ -341,14 +524,6 @@ int CheckInputFile(char *fname, char **realname)
 	fprintf(stderr, "%s is not a PNG file!\n", fname);
 	return -1;
     }
-    if(head.mode!=2 && head.mode!=3) {
-	fprintf(stderr, "%s has unsupported mode %d\n", head.mode);
-	return -1;
-    }
-    if(head.bpp!=8) {
-	fprintf(stderr, "%s has unsupported bpp %d\n", head.bpp);
-	return -1;
-    }
 
     if (global.max_image_width < head.width)
 	global.max_image_width = head.width;
@@ -464,7 +639,6 @@ void args_callback_usage(char *name)
     printf("-Y pixel              (height) Force movie height to pixel (default: autodetect)\n");
     printf("-v level              (verbose) Set verbose level (0=quiet, 1=default, 2=debug)\n");
     printf("-V                    (version) Print version information and exit\n");
-    printf("The following options can be set independently for each image: -q -s\n");
 }