1 /* -*- mode: c; tab-width: 4; -*- ---------------------------[for (x)emacs]--
3 $Id: gif2swf.c,v 1.4 2005/05/06 16:34:59 dseg Exp $
4 GIF to SWF converter tool
6 Part of the swftools package.
8 Copyright (c) 2005 Daichi Shinozaki <dseg@shield.jp>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
24 This file is derived from png2swf.c */
29 #include "../lib/rfxswf.h"
30 #include "../lib/args.h"
32 #define MAX_INPUT_FILES 1024
33 #define VERBOSE(x) (global.verbose>=x)
34 #define AS_FIRSTFRAME "if(n<1) n=1;"
35 #define AS_LASTFRAME "if(n<=%d-1){n=n+1;gotoAndPlay(1);}else stop();"
54 } image[MAX_INPUT_FILES];
61 enum disposal_method {
69 void SetFrameAction(TAG** t, const char *src, int ver)
73 as = swf_ActionCompile(src, ver);
75 fprintf(stderr, "Couldn't compile ActionScript\n");
77 *t = swf_InsertTag(*t, ST_DOACTION);
78 swf_ActionSet(*t, as);
83 int getGifDisposalMethod(GifFileType * gft, int framenum)
86 ExtensionBlock* ext = gft->SavedImages[framenum].ExtensionBlocks;
88 for (i=0; i < gft->SavedImages[framenum].ExtensionBlockCount; i++, ext++)
89 if (ext->Function == GRAPHICS_EXT_FUNC_CODE)
90 return ((ext->Bytes[0] & 0x1C) >> 2);
96 // I couldn't get the loop count of animated GIF which is defined in the
97 // application extension block of header using lib(un)gif.
98 // Ask the author of lib(un)gif it's really impossible.
100 U16 getGifLoopCount(GifFileType * gft) {
103 ExtensionBlock* ext = gft->SavedImages[0].ExtensionBlocks;
105 // info: http://members.aol.com/royalef/gifabout.htm#net-extension
106 for (i=0; i < gft->SavedImages[0].ExtensionBlockCount; i++, ext++)
107 if (ext->Function == APPLICATION_EXT_FUNC_CODE) {
108 // fprintf(stderr, "extension size: %d\n", ext->ByteCount);
109 memcpy(sig, &ext->Bytes[0], 11);
110 // if(memcmp(sig, "NETSCAPE2.0", 11) == 0)
111 // fprintf(stderr, "NETSCAPE2.0\n");
112 // fprintf(stderr, "data: %d %d\n", ext->Bytes[13], ext->Bytes[14]);
118 U16 getGifDelayTime(GifFileType * gft, int framenum)
121 ExtensionBlock* ext = gft->SavedImages[framenum].ExtensionBlocks;
123 for (i=0; i < gft->SavedImages[framenum].ExtensionBlockCount; i++, ext++)
124 if (ext->Function == GRAPHICS_EXT_FUNC_CODE)
125 return GET16(&ext->Bytes[1]);
130 int getTransparentColor(GifFileType * gft, int framenum)
133 ExtensionBlock* ext = gft->SavedImages[framenum].ExtensionBlocks;
135 // Get transparency color from graphic extension block
136 for (i=0; i < gft->SavedImages[framenum].ExtensionBlockCount; i++, ext++)
137 if ((ext->Function == GRAPHICS_EXT_FUNC_CODE) &&
138 (ext->Bytes[0] & 1)) { // there is a transparent color
139 return ext->Bytes[3] == 0 ?
141 (U8)ext->Bytes[3]; // transparency color
147 TAG *MovieStart(SWF * swf, float framerate, int dx, int dy)
152 memset(swf, 0x00, sizeof(SWF));
154 swf->fileVersion = global.version;
155 swf->frameRate = (int)(256.0 * framerate);
156 swf->movieSize.xmax = dx * 20;
157 swf->movieSize.ymax = dy * 20;
159 t = swf->firstTag = swf_InsertTag(NULL, ST_SETBACKGROUNDCOLOR);
161 rgb.r = rgb.g = rgb.b = rgb.a = 0x00;
163 //rgb.g = 0xff; //<--- handy for testing alpha conversion
169 int MovieFinish(SWF * swf, TAG * t, char *sname)
171 int f, so = fileno(stdout);
172 t = swf_InsertTag(t, ST_END);
174 if ((!isatty(so)) && (!sname))
178 sname = "output.swf";
179 f = open(sname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644);
183 if FAILED(swf_WriteCGI(swf)) fprintf(stderr,"WriteCGI() failed.\n");
185 if (global.version >= 6) {
186 if (swf_WriteSWC(f, swf)<0)
187 fprintf(stderr, "Unable to write output file: %s\n", sname);
189 if (swf_WriteSWF(f, swf)<0)
190 fprintf(stderr, "Unable to write output file: %s\n", sname);
200 TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id, int imgidx)
207 U8 *imagedata, *from, *to;
211 struct gif_header header;
213 int i, j, numcolors, alphapalette;
215 int bpp; // byte per pixel
216 int swf_width, padlen;
218 ColorMapObject* colormap;
220 int interlacedOffset[] = { 0, 4, 2, 1 };// The way Interlaced image should
221 int interlacedJumps[] = { 8, 8, 4, 2 }; // be read - offsets and jumps...
224 char framename[8] = { 0, 0, 0, 0, 0, 0, 0, '\0' };
230 if ((fi = fopen(sname, "rb")) == NULL) {
232 fprintf(stderr, "Read access failed: %s\n", sname);
237 if ((gft = DGifOpenFileName(sname)) == NULL) {
238 fprintf(stderr, "%s is not a GIF file!\n", sname);
241 if (DGifSlurp(gft) != GIF_OK) {
246 header.width = gft->SWidth;
247 header.height = gft->SHeight;
249 pal = (RGBA*)malloc(256 * sizeof(RGBA));
250 memset(pal, 0, 256 * sizeof(RGBA));
252 img = &gft->SavedImages[imgidx].ImageDesc;
254 // Local colormap has precedence over Global colormap
255 colormap = img->ColorMap ? img->ColorMap : gft->SColorMap;
256 numcolors = colormap->ColorCount;
257 alphapalette = getTransparentColor(gft, imgidx);
259 fprintf(stderr, "transparent palette index => %d\n", alphapalette);
260 bpp = (alphapalette >= 0 ? 4 : 3);
262 // bgcolor is the background color to fill the bitmap
263 if (gft->SColorMap) // There is a GlobalColorMap
264 bgcolor = (U8)gft->SBackGroundColor;// The SBGColor is meaningful
266 if (alphapalette >= 0) // There is a transparency color
267 bgcolor = alphapalette; // set the bgcolor to tranparent
269 bgcolor = 0; // Don't know what to do here.
270 // If this doesn't work, we could
271 // create a new color and set the
272 // alpha-channel to transparent
273 // (unless we are using all the 256
274 // colors, in which case either we
275 // give up, or move to 16-bits palette
277 fprintf(stderr, "BG palette index => %u\n", bgcolor);
279 for (i=0; i<numcolors; i++) {
280 c = colormap->Colors[i];
282 pal[i].r = pal[i].g = pal[i].b = pal[i].a = 0;// Fully transparent
283 else if (i == alphapalette)
284 pal[i].r = pal[i].g = pal[i].b = pal[i].a = 0;// Fully transparent
289 pal[i].a = 255; // Fully opaque
293 t = swf_InsertTag(t, bpp == 4 ?
294 ST_DEFINEBITSLOSSLESS2 : ST_DEFINEBITSLOSSLESS);
295 swf_SetU16(t, id); // id
297 // Ah! The Flash specs says scanlines must be DWORD ALIGNED!
298 // (but image width is the correct number of pixels)
299 swf_width = BYTES_PER_SCANLINE(header.width);
301 if ((imagedata = (U8 *)malloc(swf_width*header.height)) == NULL) {
302 fprintf(stderr, "Failed to allocate memory required, aborted.");
307 from = (U8 *)gft->SavedImages[imgidx].RasterBits;
309 if (swf_width == header.width) {
310 // we are all nicely aligned and don't need to move the bitmap around.
311 // Just copy the bits into the image buffer.
312 if (! gft->Image.Interlace)
313 if (header.width == img->Width && header.height == img->Height)
314 memcpy(to, from, header.width*header.height);
315 else { //small screen
316 for (i = 0; i < header.height; i++, to += header.width) {
317 memset(to, bgcolor, header.width);
318 if (i >= img->Top && i < img->Top + img->Height) {
319 memcpy(to + img->Left, from, img->Width);
325 else // Need to perform 4 passes on the interlaced images
326 for (i = 0; i < 4; i++)
327 for (j = interlacedOffset[i]; j < header.height;
328 j += interlacedJumps[i], from += header.width)
329 memcpy(to + header.width*j, from, header.width);
331 padlen = swf_width - header.width;
333 // here we need to pad the scanline
334 if (! gft->Image.Interlace) {
335 if (header.width == img->Width &&
336 header.height == img->Height) {
337 for (i=0; i < header.height; i++, from+=header.width, to+=swf_width) {
338 memcpy(to, from, header.width);
339 memset(to + header.width, bgcolor, padlen);
341 } else { //small screen
342 for (i=0; i < header.height; i++, to += swf_width) {
343 memset(to, bgcolor, swf_width);
344 if (i >= img->Top && i < img->Top + img->Height) {
345 memcpy(to + img->Left, from, img->Width);
350 } else { // Need to perform 4 passes on the interlaced images
351 for (i = 0; i < 4; i++)
352 for (j = interlacedOffset[i]; j < header.height;
353 j += interlacedJumps[i], from += header.width) {
354 memcpy(to + swf_width*j, from, header.width);
355 memset(to + swf_width*j, bgcolor, padlen);
359 swf_SetLosslessBitsIndexed(t,header.width,header.height,imagedata,pal,256);
361 t = swf_InsertTag(t, ST_DEFINESHAPE);
364 swf_GetMatrix(NULL, &m);
367 fs = swf_ShapeAddBitmapFillStyle(s, &m, id, 0);
369 swf_SetU16(t, id + 1); // id
372 r.xmax = header.width * 20;
373 r.ymax = header.height * 20;
376 swf_SetShapeHeader(t, s);
378 swf_ShapeSetAll(t, s, 0, 0, 0, fs, 0);
379 swf_ShapeSetLine(t, s, r.xmax, 0);
380 swf_ShapeSetLine(t, s, 0, r.ymax);
381 swf_ShapeSetLine(t, s, -r.xmax, 0);
382 swf_ShapeSetLine(t, s, 0, -r.ymax);
387 if ((imgidx > 0) && // REMOVEOBJECT2 not needed at frame 1(imgidx==0)
388 (global.imagecount > 1))
390 // check last frame's disposal method
391 if ((disposal = getGifDisposalMethod(gft, imgidx-1)) >= 0)
395 swf_SetU16(t, depth-1);
396 t = swf_InsertTag(t, ST_REMOVEOBJECT2);
398 fprintf(stdout, " [none]\n");
402 fprintf(stdout, " [don't dispose]\n");
404 case RESTORE_TO_BGCOLOR:
405 swf_SetU16(t, depth-1);
406 t = swf_InsertTag(t, ST_REMOVEOBJECT2);
408 fprintf(stdout, " [restore to bg color]\n");
410 case RESTORE_TO_PREVIOUS:
411 swf_SetU16(t, depth-1);
412 t = swf_InsertTag(t, ST_REMOVEOBJECT2);
414 fprintf(stdout, " [restore to previous]\n");
420 swf_SetU16(t, depth);
421 t = swf_InsertTag(t, ST_PLACEOBJECT2);
423 swf_GetMatrix(NULL, &m);
424 m.tx = (swf->movieSize.xmax - (int) header.width * 20) / 2;
425 m.ty = (swf->movieSize.ymax - (int) header.height * 20) / 2;
426 swf_ObjectPlace(t, id + 1, depth, &m, NULL, NULL);
428 if ((global.imagecount > 1) &&
429 (global.loopcount > 0)) { // 0 means "infinite loop"
431 SetFrameAction(&t, AS_FIRSTFRAME, global.version);
434 t = swf_InsertTag(t, ST_SHOWFRAME);
436 if (global.imagecount > 1) { // multi-frame GIF?
438 delay = getGifDelayTime(gft, imgidx); // delay in 1/100 sec
439 framecnt = (int)(global.framerate * (delay/100.0));
442 fprintf(stderr, "at frame %d: pad %d frames(%.3f sec)\n",
443 imgidx + 1, framecnt, delay/100.0);
445 framecnt -= 1; // already inserted a frame
447 t = swf_InsertTag(t, ST_SHOWFRAME);
449 if ((imgidx == global.imagecount-1) &&
450 (global.loopcount > 0)) { // 0 means "infinite loop"
451 as_lastframe = malloc(strlen(AS_LASTFRAME) + 5); // 0-99999
452 sprintf(as_lastframe, AS_LASTFRAME, global.loopcount);
453 SetFrameAction(&t, as_lastframe, global.version);
466 GifFileType * GifOpen(char *sname) {
467 GifFileType *gft = NULL;
472 int CheckInputFile(char *fname, char **realname)
475 char *s = malloc(strlen(fname) + 5);
478 GifByteType *extdata;
487 // Check whether file exists (with typical extensions)
489 if ((fi = fopen(s, "rb")) == NULL) {
490 sprintf(s, "%s.gif", fname);
491 if ((fi = fopen(s, "rb")) == NULL) {
492 sprintf(s, "%s.GIF", fname);
493 if ((fi = fopen(s, "rb")) == NULL) {
494 sprintf(s, "%s.Gif", fname);
495 if ((fi = fopen(s, "rb")) == NULL) {
496 fprintf(stderr, "Couldn't open %s!\n", fname);
504 if ((gft = DGifOpenFileName(s)) == NULL) {
505 fprintf(stderr, "%s is not a GIF file!\n", fname);
508 if (global.max_image_width < gft->SWidth)
509 global.max_image_width = gft->SWidth;
510 if (global.max_image_height < gft->SHeight)
511 global.max_image_height = gft->SHeight;
513 if (DGifSlurp(gft) != GIF_OK) { //gft->ImageCount be set
518 if ((global.imagecount = gft->ImageCount) > 1) {
519 global.loopcount = getGifLoopCount(gft);
521 fprintf(stderr, "Loops => %u\n", global.loopcount);
525 fprintf(stderr, "%d x %d, %d images total\n",
526 gft->SWidth, gft->SHeight, gft->ImageCount);
528 for (i=0; i < gft->ImageCount; i++)
529 fprintf(stderr, "frame: %u, delay: %.3f sec\n",
530 i+1, getGifDelayTime(gft, i) / 100.0);
538 int args_callback_option(char *arg, char *val)
547 global.loopcount = atoi(val);
553 global.framerate = atof(val);
554 if ((global.framerate < 1.0/256) ||(global.framerate >= 256.0)) {
557 "Error: You must specify a valid framerate between 1/256 and 255.\n");
565 global.outfile = val;
580 global.verbose = atoi(val);
586 global.force_width = atoi(val);
592 global.force_height = atoi(val);
597 printf("gif2swf - part of %s %s\n", PACKAGE, VERSION);
607 fprintf(stderr, "Unknown option: -%s\n", arg);
614 static struct options_t options[] = {
627 int args_callback_longoption(char *name, char *val)
629 return args_long2shortoption(options, name, val);
632 int args_callback_command(char *arg, char *next) // actually used as filename
635 if (CheckInputFile(arg, &s) < 0) {
637 fprintf(stderr, "Error opening input file: %s\n", arg);
641 image[global.nfiles].filename = s;
643 if (global.nfiles >= MAX_INPUT_FILES) {
645 fprintf(stderr, "Error: Too many input files.\n");
653 void args_callback_usage(char *name)
656 printf("Usage: %s [-X width] [-Y height] [-o file.swf] [-r rate] file1.gif [file2.gif...]\n", name);
658 printf("-l , --loop <loop count> Set loop count. (default: 0 [= infinite loop])\n");
659 printf("-r , --rate <framerate> Set movie framerate (frames per second)\n");
660 printf("-o , --output <filename> Set name for SWF output file.\n");
661 printf("-z , --zlib <zlib> Enable Flash 6 (MX) Zlib Compression\n");
662 printf("-X , --pixel <width> Force movie width to <width> (default: autodetect)\n");
663 printf("-Y , --pixel <height> Force movie height to <height> (default: autodetect)\n");
664 printf("-v , --verbose <level> Set verbose level (0=quiet, 1=default, 2=debug)\n");
665 printf("-C , --cgi For use as CGI- prepend http header, write to stdout\n");
666 printf("-V , --version Print version information and exit\n");
670 int main(int argc, char **argv)
675 memset(&global, 0x00, sizeof(global));
677 global.framerate = 1.0;
680 global.loopcount = 0;
682 processargs(argc, argv);
685 fprintf(stderr, "loop count => %d\n", global.loopcount);
687 if (global.nfiles<=0) {
688 fprintf(stderr, "No gif files found in arguments\n");
693 fprintf(stderr, "Processing %i file(s)...\n", global.nfiles);
695 if (global.imagecount > 1) // multi-frame GIF?
696 if (global.framerate == 1.0) // user not specified '-r' option?
697 global.framerate = 10.0;
699 t = MovieStart(&swf, global.framerate,
700 global.force_width ? global.force_width : global.max_image_width,
701 global.force_height ? global.force_height : global.max_image_height);
704 for (i = 0; i < global.nfiles; i++) {
706 fprintf(stderr, "[%03i] %s\n", i,
708 t = MovieAddFrame(&swf, t, image[i].filename, (i*2)+1, 0);
709 for (j = 2; j <= global.imagecount; j++)
710 t = MovieAddFrame(&swf, t, image[i].filename, (j*2)-1, j-1);
711 free(image[i].filename);
715 MovieFinish(&swf, t, global.outfile);