1 /* -*- mode: c; tab-width: 4; -*- ---------------------------[for (x)emacs]--
3 $Id: gif2swf.c,v 1.7 2008/03/12 19:13:31 kramm 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) n=0;"
35 #define AS_LASTFRAME "if(n<%d){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);
95 int getGifLoopCount(GifFileType * gft)
98 ExtensionBlock *ext = gft->SavedImages[0].ExtensionBlocks;
100 for (i = 0; i < gft->SavedImages[0].ExtensionBlockCount; i++, ext++)
101 if (ext->Function == APPLICATION_EXT_FUNC_CODE) {
102 // info: http://semmix.pl/color/exgraf/eeg24.htm
103 if (ext->ByteCount == 11 &&
104 (strncmp(&ext->Bytes[0], "NETSCAPE2.0", 11) == 0 ||
105 strncmp(&ext->Bytes[0], "ANIMEXTS1.0", 11) == 0)) {
106 // check for the subblock
108 if (ext->ByteCount != 3)
111 loop = GET16(&ext->Bytes[1]);
120 U16 getGifDelayTime(GifFileType * gft, int framenum)
123 ExtensionBlock *ext = gft->SavedImages[framenum].ExtensionBlocks;
125 for (i = 0; i < gft->SavedImages[framenum].ExtensionBlockCount; i++, ext++)
126 if (ext->Function == GRAPHICS_EXT_FUNC_CODE)
127 return GET16(&ext->Bytes[1]);
132 int getTransparentColor(GifFileType * gft, int framenum)
135 ExtensionBlock *ext = gft->SavedImages[framenum].ExtensionBlocks;
137 // Get transparency color from graphic extension block
138 for (i = 0; i < gft->SavedImages[framenum].ExtensionBlockCount; i++, ext++)
139 if ((ext->Function == GRAPHICS_EXT_FUNC_CODE) && (ext->Bytes[0] & 1)) {
140 // there is a transparent color
141 return ext->Bytes[3] == 0 ? 0 : // exception
142 (U8) ext->Bytes[3]; // transparency color
148 TAG *MovieStart(SWF * swf, float framerate, int dx, int dy)
153 memset(swf, 0x00, sizeof(SWF));
155 swf->fileVersion = global.version;
156 swf->frameRate = (int) (256.0 * framerate);
157 swf->movieSize.xmax = dx * 20;
158 swf->movieSize.ymax = dy * 20;
160 t = swf->firstTag = swf_InsertTag(NULL, ST_SETBACKGROUNDCOLOR);
162 rgb.r = rgb.g = rgb.b = rgb.a = 0x00;
164 //rgb.g = 0xff; //<--- handy for testing alpha conversion
170 int MovieFinish(SWF * swf, TAG * t, char *sname)
172 int f, so = fileno(stdout);
173 t = swf_InsertTag(t, ST_END);
175 if ((!isatty(so)) && (!sname))
179 sname = "output.swf";
180 f = open(sname, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
185 (swf_WriteCGI(swf)) fprintf(stderr, "WriteCGI() failed.\n");
187 if (swf_WriteSWF(f, swf) < 0)
188 fprintf(stderr, "Unable to write output file: %s\n", sname);
197 TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id, int imgidx)
204 U8 *imagedata, *from, *to;
208 struct gif_header header;
210 int i, j, numcolors, alphapalette;
212 int bpp; // byte per pixel
213 int swf_width, padlen;
215 ColorMapObject *colormap;
217 int interlacedOffset[] = { 0, 4, 2, 1 }; // The way Interlaced image should
218 int interlacedJumps[] = { 8, 8, 4, 2 }; // be read - offsets and jumps...
226 if ((fi = fopen(sname, "rb")) == NULL) {
228 fprintf(stderr, "Read access failed: %s\n", sname);
233 if ((gft = DGifOpenFileName(sname)) == NULL) {
234 fprintf(stderr, "%s is not a GIF file!\n", sname);
238 if (DGifSlurp(gft) != GIF_OK) {
243 header.width = gft->SWidth;
244 header.height = gft->SHeight;
246 pal = (RGBA *) malloc(256 * sizeof(RGBA));
247 memset(pal, 0, 256 * sizeof(RGBA));
249 img = &gft->SavedImages[imgidx].ImageDesc;
251 // Local colormap has precedence over Global colormap
252 colormap = img->ColorMap ? img->ColorMap : gft->SColorMap;
253 numcolors = colormap->ColorCount;
254 alphapalette = getTransparentColor(gft, imgidx);
256 fprintf(stderr, "transparent palette index => %d\n", alphapalette);
257 bpp = (alphapalette >= 0 ? 4 : 3);
259 // bgcolor is the background color to fill the bitmap
260 if (gft->SColorMap) // There is a GlobalColorMap
261 bgcolor = (U8) gft->SBackGroundColor; // The SBGColor is meaningful
262 else if (alphapalette >= 0) // There is a transparency color
263 bgcolor = alphapalette; // set the bgcolor to tranparent
266 // Don't know what to do here.
267 // If this doesn't work, we could
268 // create a new color and set the
269 // alpha-channel to transparent
270 // (unless we are using all the 256
271 // colors, in which case either we
272 // give up, or move to 16-bits palette
274 fprintf(stderr, "BG palette index => %u\n", bgcolor);
276 for (i = 0; i < numcolors; i++) {
277 c = colormap->Colors[i];
278 if (i == bgcolor || i == alphapalette)
279 pal[i].r = pal[i].g = pal[i].b = pal[i].a = 0; // Fully transparent
284 pal[i].a = 255; // Fully opaque
288 t = swf_InsertTag(t, bpp == 4 ? ST_DEFINEBITSLOSSLESS2 : ST_DEFINEBITSLOSSLESS);
289 swf_SetU16(t, id); // id
291 // Ah! The Flash specs says scanlines must be DWORD ALIGNED!
292 // (but image width is the correct number of pixels)
293 swf_width = BYTES_PER_SCANLINE(header.width);
295 if ((imagedata = (U8 *) malloc(swf_width * header.height)) == NULL) {
296 fprintf(stderr, "Failed to allocate memory required, aborted.");
301 from = (U8 *) gft->SavedImages[imgidx].RasterBits;
303 if (swf_width == header.width) {
304 // we are all nicely aligned and don't need to move the bitmap around.
305 // Just copy the bits into the image buffer.
306 if (!gft->Image.Interlace)
307 if (header.width == img->Width && header.height == img->Height)
308 memcpy(to, from, header.width * header.height);
309 else { //small screen
310 for (i = 0; i < header.height; i++, to += header.width) {
311 memset(to, bgcolor, header.width);
312 if (i >= img->Top && i < img->Top + img->Height) {
313 memcpy(to + img->Left, from, img->Width);
319 else // Need to perform 4 passes on the interlaced images
320 for (i = 0; i < 4; i++)
321 for (j = interlacedOffset[i]; j < header.height;
322 j += interlacedJumps[i], from += header.width)
323 memcpy(to + header.width * j, from, header.width);
325 padlen = swf_width - header.width;
327 // here we need to pad the scanline
328 if (!gft->Image.Interlace) {
329 if (header.width == img->Width && header.height == img->Height) {
330 for (i = 0; i < header.height; i++, from += header.width, to += swf_width) {
331 memcpy(to, from, header.width);
332 memset(to + header.width, bgcolor, padlen);
334 } else { //small screen
335 for (i = 0; i < header.height; i++, to += swf_width) {
336 memset(to, bgcolor, swf_width);
337 if (i >= img->Top && i < img->Top + img->Height) {
338 memcpy(to + img->Left, from, img->Width);
343 } else { // Need to perform 4 passes on the interlaced images
344 for (i = 0; i < 4; i++)
345 for (j = interlacedOffset[i]; j < header.height;
346 j += interlacedJumps[i], from += header.width) {
347 memcpy(to + swf_width * j, from, header.width);
348 memset(to + swf_width * j, bgcolor, padlen);
352 swf_SetLosslessBitsIndexed(t, header.width, header.height, imagedata, pal, 256);
354 t = swf_InsertTag(t, ST_DEFINESHAPE);
357 swf_GetMatrix(NULL, &m);
360 fs = swf_ShapeAddBitmapFillStyle(s, &m, id, 0);
362 swf_SetU16(t, id + 1); // id
365 r.xmax = header.width * 20;
366 r.ymax = header.height * 20;
369 swf_SetShapeHeader(t, s);
371 swf_ShapeSetAll(t, s, 0, 0, 0, fs, 0);
372 swf_ShapeSetLine(t, s, r.xmax, 0);
373 swf_ShapeSetLine(t, s, 0, r.ymax);
374 swf_ShapeSetLine(t, s, -r.xmax, 0);
375 swf_ShapeSetLine(t, s, 0, -r.ymax);
380 if ((imgidx > 0) && // REMOVEOBJECT2 not needed at frame 1(imgidx==0)
381 (global.imagecount > 1)) {
382 // check last frame's disposal method
383 if ((disposal = getGifDisposalMethod(gft, imgidx - 1)) >= 0) {
386 // [Replace one full-size, non-transparent frame with another]
387 t = swf_InsertTag(t, ST_REMOVEOBJECT2);
388 swf_SetU16(t, depth - 1);
390 fprintf(stdout, " [none]\n");
393 // [Any pixels not covered up by the next frame continue to display]
395 fprintf(stdout, " [don't dispose]\n");
397 case RESTORE_TO_BGCOLOR:
398 // [The background color or background tile -rather than a previous frame-
399 // shows through transparent pixels]
400 t = swf_InsertTag(t, ST_REMOVEOBJECT2);
401 swf_SetU16(t, depth - 2);
403 fprintf(stdout, " [restore to bg color]\n");
405 case RESTORE_TO_PREVIOUS:
406 // [Restores to the state of a previous, undisposed frame]
407 // ** NOT IMPLEMENTED YET (same as "restore to bgcolor") **
408 t = swf_InsertTag(t, ST_REMOVEOBJECT2);
409 swf_SetU16(t, depth - 1);
411 fprintf(stdout, " [restore to previous]\n");
419 swf_SetU16(t, depth);
420 t = swf_InsertTag(t, ST_PLACEOBJECT2);
422 swf_GetMatrix(NULL, &m);
423 m.tx = (swf->movieSize.xmax - (int) header.width * 20) / 2;
424 m.ty = (swf->movieSize.ymax - (int) header.height * 20) / 2;
425 swf_ObjectPlace(t, id + 1, depth, &m, NULL, NULL);
427 if ((global.imagecount > 1) && (global.loopcount > 0)) { // 0 means infinite loop
429 SetFrameAction(&t, AS_FIRSTFRAME, global.version);
432 t = swf_InsertTag(t, ST_SHOWFRAME);
434 if (global.imagecount > 1) { // multi-frame GIF?
436 delay = getGifDelayTime(gft, imgidx); // delay in 1/100 sec
437 framecnt = (int) (global.framerate * (delay / 100.0));
440 fprintf(stderr, "at frame %d: pad %d frames(%.3f sec)\n",
441 imgidx + 1, framecnt, delay / 100.0);
443 framecnt -= 1; // already inserted a frame
445 t = swf_InsertTag(t, ST_SHOWFRAME);
447 if ((imgidx == global.imagecount - 1) &&global.loopcount > 0) { // last frame
448 as_lastframe = malloc(strlen(AS_LASTFRAME) + 5); // 0-99999
449 sprintf(as_lastframe, AS_LASTFRAME, global.loopcount);
450 SetFrameAction(&t, as_lastframe, global.version);
463 int CheckInputFile(char *fname, char **realname)
466 char *s = malloc(strlen(fname) + 5);
474 // Check whether file exists (with typical extensions)
476 if ((fi = fopen(s, "rb")) == NULL) {
477 sprintf(s, "%s.gif", fname);
478 if ((fi = fopen(s, "rb")) == NULL) {
479 sprintf(s, "%s.GIF", fname);
480 if ((fi = fopen(s, "rb")) == NULL) {
481 sprintf(s, "%s.Gif", fname);
482 if ((fi = fopen(s, "rb")) == NULL) {
483 fprintf(stderr, "Couldn't open %s!\n", fname);
491 if ((gft = DGifOpenFileName(s)) == NULL) {
492 fprintf(stderr, "%s is not a GIF file!\n", fname);
496 if (global.max_image_width < gft->SWidth)
497 global.max_image_width = gft->SWidth;
498 if (global.max_image_height < gft->SHeight)
499 global.max_image_height = gft->SHeight;
501 if (DGifSlurp(gft) != GIF_OK) {
505 // After DGifSlurp() call, gft->ImageCount become available
506 if ((global.imagecount = gft->ImageCount) >1) {
507 if (global.loopcount < 0) {
508 global.loopcount = getGifLoopCount(gft);
510 fprintf(stderr, "Loops => %d\n", global.loopcount);
515 fprintf(stderr, "%d x %d, %d images total\n", gft->SWidth, gft->SHeight, gft->ImageCount);
517 for (i = 0; i < gft->ImageCount; i++)
518 fprintf(stderr, "frame: %u, delay: %.3f sec\n", i + 1, getGifDelayTime(gft, i) / 100.0);
526 int args_callback_option(char *arg, char *val)
535 global.loopcount = atoi(val);
541 global.framerate = atof(val);
542 if ((global.framerate < 1.0 / 256) ||(global.framerate >= 256.0)) {
545 "Error: You must specify a valid framerate between 1/256 and 255.\n");
553 global.outfile = val;
568 global.verbose = atoi(val);
574 global.force_width = atoi(val);
580 global.force_height = atoi(val);
585 printf("gif2swf - part of %s %s\n", PACKAGE, VERSION);
595 fprintf(stderr, "Unknown option: -%s\n", arg);
602 static struct options_t options[] = {
615 int args_callback_longoption(char *name, char *val)
617 return args_long2shortoption(options, name, val);
620 int args_callback_command(char *arg, char *next) // actually used as filename
623 if (CheckInputFile(arg, &s) < 0) {
625 fprintf(stderr, "Error opening input file: %s\n", arg);
629 image[global.nfiles].filename = s;
631 if (global.nfiles >= MAX_INPUT_FILES) {
633 fprintf(stderr, "Error: Too many input files.\n");
641 void args_callback_usage(char *name)
644 printf("Usage: %s [-X width] [-Y height] [-o file.swf] [-r rate] file1.gif [file2.gif ...]\n", name);
646 printf("-r , --rate <framerate> Set movie framerate (frames per second)\n");
647 printf("-o , --output <filename> Set name for SWF output file.\n");
648 printf("-z , --zlib <zlib> Enable Flash 6 (MX) Zlib Compression\n");
649 printf("-l , --loop <loop count> Set loop count. (default: 0 [=infinite loop])\n");
650 printf("-X , --pixel <width> Force movie width to <width> (default: autodetect)\n");
651 printf("-Y , --pixel <height> Force movie height to <height> (default: autodetect)\n");
652 printf("-v , --verbose <level> Set verbose level (0=quiet, 1=default, 2=debug)\n");
653 printf("-C , --cgi For use as CGI- prepend http header, write to stdout\n");
654 printf("-V , --version Print version information and exit\n");
658 int main(int argc, char **argv)
663 memset(&global, 0x00, sizeof(global));
665 global.framerate = 1.0;
668 global.loopcount = -1;
670 processargs(argc, argv);
672 if (global.nfiles <= 0) {
673 fprintf(stderr, "No gif files found in arguments\n");
678 fprintf(stderr, "Processing %i file(s)...\n", global.nfiles);
680 if (global.imagecount > 1) // multi-frame GIF?
681 if (global.framerate == 1.0) // user not specified '-r' option?
682 global.framerate = 10.0;
684 t = MovieStart(&swf, global.framerate,
685 global.force_width ? global.force_width : global.max_image_width,
686 global.force_height ? global.force_height : global.max_image_height);
689 for (i = 0; i < global.nfiles; i++) {
691 fprintf(stderr, "[%03i] %s\n", i, image[i].filename);
692 t = MovieAddFrame(&swf, t, image[i].filename, (i * 2) + 1, 0);
693 for (j = 2; j <= global.imagecount; j++)
694 t = MovieAddFrame(&swf, t, image[i].filename, (j * 2) - 1, j - 1);
695 free(image[i].filename);
699 MovieFinish(&swf, t, global.outfile);