-
- if(!png_read_header(fi, &header))
- return 0;
-
- if(header.mode == 3 || header.mode == 0) bypp = 1;
- 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);
-
- fseek(fi,8,SEEK_SET);
- while(!feof(fi))
- {
- if(!png_read_chunk(&tagid, &len, &data, fi))
- break;
- if(!strncmp(tagid, "IEND", 4)) {
- break;
- }
- if(!strncmp(tagid, "PLTE", 4)) {
- palette = data;
- palettelen = len/3;
- 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(!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);
-
- swf_SetU16(t, id); // id
- 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;
- int opaque=0;
- int transparent=0;
- /* 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;
- U8*dest;
- U8*old;
- dest = &data2[(y*header.width)*4];
-
- if(header.bpp == 8)
- {
- /* one byte per pixel */
- src = &imagedata[pos];
- pos+=header.width*(header.mode==6?4:3);
- } else {
- /* not implemented yet */
- exit(1);
- }
-
- if(!y) {
- memset(data2,0,header.width*4);
- old = &data2[y*header.width*4];
- } else {
- old = &data2[(y-1)*header.width*4];
- }
- if(header.mode==6)
- applyfilter4(mode, src, old, dest, header.width);
- else
- applyfilter3(mode, src, old, dest, header.width);
- }
-
-#ifdef HAVE_LIBJPEG
- /* the image is now compressed and stored in data. Now let's take
- a look at the alpha values to determine which bitmap type we
- should write */
- if(header.mode == 6)
- for(y=0;y<header.height;y++) {
- U8*l = &data2[(y*header.width)*4];
- for(x=0;x<header.width;x++) {
- if(l[x*4+0]==255) transparent++;
- if(l[x*4+0]==0) opaque++;
- }
- }
- /* mode 6 images which are not fully opaque or fully transparent
- will be stored as definejpeg3 */
- if(header.mode == 6 && transparent != header.width*header.height
- && opaque != header.width*header.height) {
-
- printf("Image has transparency information. Storing as DefineBitsJpeg3 Tag (jpeg+alpha)\n");
-
- // we always use quality 100, since png2swf is expected to
- // use more or less lossless compression
-
- swf_SetJPEGBits3(t, header.width, header.height, (RGBA*)data2, 100);
- t->id = ST_DEFINEBITSJPEG3;
- }
- else