src/png2swf.c

   1 /* png2swf.c
   2
   3    PNG to SWF converter tool
   4
   5    Part of the swftools package.
   6
   7    Copyright (c) 2002,2003 Matthias Kramm <kramm@quiss.org>
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  22
  23 #include <stdio.h>
  24 #include <math.h>
  25 #include <fcntl.h>
  26 #include <zlib.h>
  27 #include "../lib/rfxswf.h"
  28 #include "../lib/args.h"
  29
  30 #define MAX_INPUT_FILES 1024
  31 #define VERBOSE(x) (global.verbose>=x)
  32
  33 struct {
  34     float framerate;
  35     int max_image_width;
  36     int max_image_height;
  37     int force_width;
  38     int force_height;
  39     int nfiles;
  40     int verbose;
  41     int do_cgi;
  42     char *outfile;
  43 } global;
  44
  45 struct {
  46     char *filename;
  47 } image[MAX_INPUT_FILES];
  48
  49 TAG *MovieStart(SWF * swf, float framerate, int dx, int dy)
  50 {
  51     TAG *t;
  52     RGBA rgb;
  53
  54     memset(swf, 0x00, sizeof(SWF));
  55
  56     swf->fileVersion = 5;
  57     swf->frameRate = (int)(256.0 * framerate);
  58     swf->movieSize.xmax = dx * 20;
  59     swf->movieSize.ymax = dy * 20;
  60
  61     t = swf->firstTag = swf_InsertTag(NULL, ST_SETBACKGROUNDCOLOR);
  62
  63     rgb.r = rgb.g = rgb.b = rgb.a = 0x00;
  64     //rgb.g = 0xff; //<--- handy for testing alpha conversion
  65     swf_SetRGB(t, &rgb);
  66
  67     return t;
  68 }
  69
  70 int MovieFinish(SWF * swf, TAG * t, char *sname)
  71 {
  72     int f, so = fileno(stdout);
  73     t = swf_InsertTag(t, ST_END);
  74
  75     if ((!isatty(so)) && (!sname))
  76         f = so;
  77     else {
  78         if (!sname)
  79             sname = "output.swf";
  80         f = open(sname,O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644);
  81     }
  82
  83     if(global.do_cgi) {
  84         if FAILED(swf_WriteCGI(swf)) fprintf(stderr,"WriteCGI() failed.\n");
  85     } else {
  86         if FAILED(swf_WriteSWF(f,swf)) fprintf(stderr,"WriteSWF() failed.\n");
  87         if (f != so)
  88             close(f);
  89     }
  90
  91     swf_FreeTags(swf);
  92     return 0;
  93 }
  94
  95 int png_read_chunk(char (*head)[4], int*destlen, U8**destdata, FILE*fi)
  96 {
  97     unsigned int len;
  98     if(destlen) *destlen=0;
  99     if(destdata) *destdata=0;
 100     if(!fread(&len, 4, 1, fi))
 101         return 0;
 102     if(!fread(head, 4, 1, fi))
 103         return 0;
 104     len = REVERSESWAP32(len);
 105     if(destlen) *destlen = len;
 106     if(destdata) {
 107         if(len)
 108             *destdata = malloc(len);
 109         else
 110             *destdata = 0;
 111         if(!fread(*destdata, len, 1, fi)) {
 112             *destdata = 0;
 113             if(destlen) *destlen=0;
 114             return 0;
 115         }
 116         fseek(fi, 4, SEEK_CUR);
 117
 118     } else {
 119         fseek(fi, len+4, SEEK_CUR);
 120     }
 121     return 1;
 122 }
 123
 124 unsigned int png_get_dword(FILE*fi)
 125 {
 126     unsigned int a;
 127     fread(&a,4,1,fi);
 128     return REVERSESWAP32(a);
 129 }
 130
 131 struct png_header
 132 {
 133     int width;
 134     int height;
 135     int bpp;
 136     int mode;
 137 };
 138
 139 int png_read_header(FILE*fi, struct png_header*header)
 140 {
 141     char id[4];
 142     int len;
 143     int ok=0;
 144     U8 head[8] = {137,80,78,71,13,10,26,10};
 145     U8 head2[8];
 146     U8*data;
 147     fread(head2,8,1,fi);
 148     if(strncmp(head,head2,4))
 149         return 0;
 150
 151     while(png_read_chunk(&id, &len, &data, fi))
 152     {
 153         if(VERBOSE(2))
 154             printf("%c%c%c%c %d\n", id[0],id[1],id[2],id[3],len);
 155         if(!strncasecmp(id, "IHDR", 4)) {
 156             char a,b,c,f,i;
 157             if(len < 8) exit(1);
 158             header->width = REVERSESWAP32(*(U32*)&data[0]);
 159             header->height = REVERSESWAP32(*(U32*)&data[4]);
 160             a = data[8];      // should be 8
 161             b = data[9];      // should be 3(indexed) or 2(rgb)
 162
 163             c = data[10];     // compression mode (0)
 164             f = data[11];     // filter mode (0)
 165             i = data[12];     // interlace mode (0)
 166
 167             if(VERBOSE(2)) printf("image mode:%d\n", b);
 168             if(VERBOSE(2)) printf("bpp: %d\n", a);
 169             if(VERBOSE(2)) printf("compression: %d\n", c);
 170             if(VERBOSE(2)) printf("filter: %d\n", f);
 171             if(VERBOSE(2)) printf("interlace: %d\n", i);
 172
 173             if(b!=0 && b!=2 && b!=3 && b!=6) {
 174                 fprintf(stderr, "Image mode %d not supported!\n", b);
 175                 if(b == 4) {
 176                     fprintf(stderr, "(This is a grayscale image with alpha channel-\n");
 177                     fprintf(stderr, " try converting it into an RGB image with alpha channel)\n");
 178                 }
 179                 exit(1);
 180             }
 181             if(a!=8 && (b==2 || b==6)) {
 182                 fprintf(stderr, "Bpp %d in mode %d not supported!\n", a);
 183                 exit(1);
 184             }
 185             if(c!=0) {
 186                 fprintf(stderr, "Compression mode %d not supported!\n", c);
 187                 exit(1);
 188             }
 189             if(f!=0) {
 190                 fprintf(stderr, "Filter mode %d not supported!\n", f);
 191                 exit(1);
 192             }
 193             if(i!=0) {
 194                 fprintf(stderr, "Interlace mode %d not supported!\n", i);
 195                 exit(1);
 196             }
 197             if(VERBOSE(2))
 198                 printf("%dx%d %d %d %d %d %d\n",header->width, header->height, a,b,c,f,i);
 199             header->bpp = a;
 200             header->mode = b;
 201             ok = 1;
 202         }
 203
 204         free(data);
 205     }
 206     return ok;
 207 }
 208
 209 typedef unsigned char byte;
 210 #define ABS(a) ((a)>0?(a):(-(a)))
 211 byte inline PaethPredictor (byte a,byte b,byte c)
 212 {
 213         // a = left, b = above, c = upper left
 214         int p = a + b - c;        // initial estimate
 215         int pa = ABS(p - a);      // distances to a, b, c
 216         int pb = ABS(p - b);
 217         int pc = ABS(p - c);
 218         // return nearest of a,b,c,
 219         // breaking ties in order a,b,c.
 220         if (pa <= pb && pa <= pc)
 221                 return a;
 222         else if (pb <= pc)
 223                 return b;
 224         else return c;
 225 }
 226
 227 void applyfilter3(int mode, U8*src, U8*old, U8*dest, int width)
 228 {
 229     int x;
 230     unsigned char lastr=0;
 231     unsigned char lastg=0;
 232     unsigned char lastb=0;
 233     unsigned char upperlastr=0;
 234     unsigned char upperlastg=0;
 235     unsigned char upperlastb=0;
 236
 237     if(mode==0) {
 238         for(x=0;x<width;x++) {
 239             dest[0] = 255;
 240             dest[1] = src[0];
 241             dest[2] = src[1];
 242             dest[3] = src[2];
 243             dest+=4;
 244             src+=3;
 245         }
 246     }
 247     else if(mode==1) {
 248         for(x=0;x<width;x++) {
 249             dest[0] = 255;
 250             dest[1] = src[0]+lastr;
 251             dest[2] = src[1]+lastg;
 252             dest[3] = src[2]+lastb;
 253             lastr = dest[1];
 254             lastg = dest[2];
 255             lastb = dest[3];
 256             dest+=4;
 257             src+=3;
 258         }
 259     }
 260     else if(mode==2) {
 261         for(x=0;x<width;x++) {
 262             dest[0] = 255;
 263             dest[1] = src[0]+old[1];
 264             dest[2] = src[1]+old[2];
 265             dest[3] = src[2]+old[3];
 266             dest+=4;
 267             old+=4;
 268             src+=3;
 269         }
 270     }
 271     else if(mode==3) {
 272         for(x=0;x<width;x++) {
 273             dest[0] = 255;
 274             dest[1] = src[0]+(old[1]+lastr)/2;
 275             dest[2] = src[1]+(old[2]+lastg)/2;
 276             dest[3] = src[2]+(old[3]+lastb)/2;
 277             lastr = dest[1];
 278             lastg = dest[2];
 279             lastb = dest[3];
 280             dest+=4;
 281             old+=4;
 282             src+=3;
 283         }
 284     }
 285     else if(mode==4) {
 286         for(x=0;x<width;x++) {
 287             dest[0] = 255;
 288             dest[1] = src[0]+PaethPredictor(lastr,old[1],upperlastr);
 289             dest[2] = src[1]+PaethPredictor(lastg,old[2],upperlastg);
 290             dest[3] = src[2]+PaethPredictor(lastb,old[3],upperlastb);
 291             lastr = dest[1];
 292             lastg = dest[2];
 293             lastb = dest[3];
 294             upperlastr = old[1];
 295             upperlastg = old[2];
 296             upperlastb = old[3];
 297             dest+=4;
 298             old+=4;
 299             src+=3;
 300         }
 301     }
 302
 303 }
 304
 305 void applyfilter4(int mode, U8*src, U8*old, U8*dest, int width)
 306 {
 307     int x;
 308     unsigned char lastr=0;
 309     unsigned char lastg=0;
 310     unsigned char lastb=0;
 311     unsigned char lasta=0;
 312     unsigned char upperlastr=0;
 313     unsigned char upperlastg=0;
 314     unsigned char upperlastb=0;
 315     unsigned char upperlasta=0;
 316
 317     if(mode==0) {
 318         for(x=0;x<width;x++) {
 319             dest[0] = src[3];
 320             dest[1] = src[0];
 321             dest[2] = src[1];
 322             dest[3] = src[2];
 323             dest+=4;
 324             src+=4;
 325         }
 326     }
 327     else if(mode==1) {
 328         for(x=0;x<width;x++) {
 329             dest[0] = src[3]+lasta;
 330             dest[1] = src[0]+lastr;
 331             dest[2] = src[1]+lastg;
 332             dest[3] = src[2]+lastb;
 333             lasta = dest[0];
 334             lastr = dest[1];
 335             lastg = dest[2];
 336             lastb = dest[3];
 337             dest+=4;
 338             src+=4;
 339         }
 340     }
 341     else if(mode==2) {
 342         for(x=0;x<width;x++) {
 343             dest[0] = src[3]+old[0];
 344             dest[1] = src[0]+old[1];
 345             dest[2] = src[1]+old[2];
 346             dest[3] = src[2]+old[3];
 347             dest+=4;
 348             old+=4;
 349             src+=4;
 350         }
 351     }
 352     else if(mode==3) {
 353         for(x=0;x<width;x++) {
 354             dest[0] = src[3]+(old[0]+lasta)/2;
 355             dest[1] = src[0]+(old[1]+lastr)/2;
 356             dest[2] = src[1]+(old[2]+lastg)/2;
 357             dest[3] = src[2]+(old[3]+lastb)/2;
 358             lasta = dest[0];
 359             lastr = dest[1];
 360             lastg = dest[2];
 361             lastb = dest[3];
 362             dest+=4;
 363             old+=4;
 364             src+=4;
 365         }
 366     }
 367     else if(mode==4) {
 368         for(x=0;x<width;x++) {
 369             dest[0] = src[3]+PaethPredictor(lasta,old[0],upperlasta);
 370             dest[1] = src[0]+PaethPredictor(lastr,old[1],upperlastr);
 371             dest[2] = src[1]+PaethPredictor(lastg,old[2],upperlastg);
 372             dest[3] = src[2]+PaethPredictor(lastb,old[3],upperlastb);
 373             lasta = dest[0];
 374             lastr = dest[1];
 375             lastg = dest[2];
 376             lastb = dest[3];
 377             upperlasta = old[0];
 378             upperlastr = old[1];
 379             upperlastg = old[2];
 380             upperlastb = old[3];
 381             dest+=4;
 382             old+=4;
 383             src+=4;
 384         }
 385     }
 386
 387 }
 388
 389 void applyfilter1(int mode, U8*src, U8*old, U8*dest, int width)
 390 {
 391     int x;
 392     unsigned char last=0;
 393     unsigned char upperlast=0;
 394
 395     if(mode==0) {
 396         for(x=0;x<width;x++) {
 397             *dest = *src;
 398             dest++;
 399             src++;
 400         }
 401     }
 402     else if(mode==1) {
 403         for(x=0;x<width;x++) {
 404             *dest = *src+last;
 405             last = *dest;
 406             dest++;
 407             src++;
 408         }
 409     }
 410     else if(mode==2) {
 411         for(x=0;x<width;x++) {
 412             *dest = *src+*old;
 413             dest++;
 414             old++;
 415             src++;
 416         }
 417     }
 418     else if(mode==3) {
 419         for(x=0;x<width;x++) {
 420             *dest = *src+(*old+last)/2;
 421             last = *dest;
 422             dest++;
 423             old++;
 424             src++;
 425         }
 426     }
 427     else if(mode==4) {
 428         for(x=0;x<width;x++) {
 429             *dest = *src+PaethPredictor(last,*old,upperlast);
 430             last = *dest;
 431             upperlast = *old;
 432             dest++;
 433             old++;
 434             src++;
 435         }
 436     }
 437
 438 }
 439
 440 TAG *MovieAddFrame(SWF * swf, TAG * t, char *sname, int id)
 441 {
 442     SHAPE *s;
 443     SRECT r;
 444     MATRIX m;
 445     int fs;
 446
 447     char tagid[4];
 448     int len;
 449     U8*data;
 450     U8*imagedata;
 451     U8*zimagedata=0;
 452     unsigned long int imagedatalen;
 453     unsigned long int zimagedatalen=0;
 454     U8*palette = 0;
 455     int palettelen = 0;
 456     U8*alphapalette = 0;
 457     int alphapalettelen = 0;
 458     struct png_header header;
 459     int bypp;
 460
 461     FILE *fi;
 462     U8 *scanline;
 463
 464     if ((fi = fopen(sname, "rb")) == NULL) {
 465         if (VERBOSE(1))
 466             fprintf(stderr, "Read access failed: %s\n", sname);
 467         return t;
 468     }
 469
 470     if(!png_read_header(fi, &header))
 471         return 0;
 472
 473     if(header.mode == 3 || header.mode == 0) bypp = 1;
 474     else
 475     if(header.mode == 2) bypp = 3;
 476     else
 477     if(header.mode == 6) bypp = 4;
 478     else
 479         return 0;
 480     imagedatalen = bypp * header.width * header.height + 65536;
 481     imagedata = malloc(imagedatalen);
 482
 483     fseek(fi,8,SEEK_SET);
 484     while(!feof(fi))
 485     {
 486         if(!png_read_chunk(&tagid, &len, &data, fi))
 487             break;
 488         if(!strncmp(tagid, "IEND", 4)) {
 489             break;
 490         }
 491         if(!strncmp(tagid, "PLTE", 4)) {
 492             palette = data;
 493             palettelen = len/3;
 494             data = 0; //don't free data
 495             if(VERBOSE(2))
 496                 printf("%d colors in palette\n", palettelen);
 497         }
 498         if(!strncmp(tagid, "tRNS", 4)) {
 499             if(header.mode == 3) {
 500                 alphapalette = data;
 501                 alphapalettelen = len;
 502                 data = 0; //don't free data
 503                 if(VERBOSE(2))
 504                     printf("found %d alpha colors\n", alphapalettelen);
 505             }
 506         }
 507         if(!strncmp(tagid, "IDAT", 4)) {
 508             if(!zimagedata) {
 509                 zimagedatalen = len;
 510                 zimagedata = malloc(len);
 511                 memcpy(zimagedata,data,len);
 512             } else {
 513                 zimagedata = realloc(zimagedata, zimagedatalen+len);
 514                 memcpy(&zimagedata[zimagedatalen], data, len);
 515                 zimagedatalen += len;
 516             }
 517         }
 518         if(data)
 519             free(data);
 520     }
 521
 522     if(!zimagedata || uncompress(imagedata, &imagedatalen, zimagedata, zimagedatalen) != Z_OK) {
 523         fprintf(stderr, "Couldn't uncompress %s!\n", sname);
 524         if(zimagedata)
 525             free(zimagedata);
 526         return 0;
 527     }
 528     free(zimagedata);
 529
 530     if(alphapalette)
 531         t = swf_InsertTag(t, ST_DEFINEBITSLOSSLESS2);
 532     else
 533         t = swf_InsertTag(t, ST_DEFINEBITSLOSSLESS);
 534
 535     swf_SetU16(t, id);          // id
 536     if(header.mode == 2 || header.mode == 6) {
 537         U8*data2 = malloc(header.width*header.height*4);
 538         int i,s=0;
 539         int x,y;
 540         int pos=0;
 541         int opaque=0;
 542         int transparent=0;
 543         int semitransparent=0;
 544         /* in case for mode 2, the following also performs 24->32 bit conversion */
 545         unsigned char* firstline = malloc(header.width*4);
 546
 547         for(y=0;y<header.height;y++) {
 548             int mode = imagedata[pos++]; //filter mode
 549             U8*src;
 550             U8*dest;
 551             U8*old;
 552             dest = &data2[(y*header.width)*4];
 553
 554             if(header.bpp == 8)
 555             {
 556                 /* one byte per pixel */
 557                 src = &imagedata[pos];
 558                 pos+=header.width*(header.mode==6?4:3);
 559             } else {
 560                 /* not implemented yet */
 561                 exit(1);
 562             }
 563
 564             if(!y) {
 565                 old = firstline;
 566                 memset(old, 0, header.width*4);
 567             } else {
 568                 old = &data2[(y-1)*header.width*4];
 569             }
 570             if(header.mode==6)
 571                 applyfilter4(mode, src, old, dest, header.width);
 572             else if(header.mode==2)
 573                 applyfilter3(mode, src, old, dest, header.width);
 574         }
 575         free(firstline);
 576
 577         /* the image is now compressed and stored in data. Now let's take
 578            a look at the alpha values */
 579         if(header.mode == 6) {
 580             for(y=0;y<header.height;y++) {
 581                 U8*l = &data2[(y*header.width)*4];
 582                 for(x=0;x<header.width;x++) {
 583                     U8 a = l[x*4];
 584                     U8 b = l[x*4+1];
 585                     U8 g = l[x*4+2];
 586                     U8 r = l[x*4+3];
 587                     if(a==255) transparent++;
 588                     else {
 589                         if(a==0) opaque++;
 590                         else semitransparent++;
 591                         l[x*4+3]=(int)r*a/255;
 592                         l[x*4+2]=(int)g*a/255;
 593                         l[x*4+1]=(int)b*a/255;
 594                     }
 595                 }
 596             }
 597             if(semitransparent || opaque) {
 598                 t->id = ST_DEFINEBITSLOSSLESS2;
 599             }
 600         }
 601         swf_SetLosslessBits(t, header.width, header.height, data2, BMF_32BIT);
 602         free(data2);
 603     } else if(header.mode == 0 || header.mode == 3) {
 604         RGBA*rgba;
 605         int swf_width = BYTES_PER_SCANLINE(header.width);
 606         U8*data2 = malloc(swf_width*header.height);
 607         U8*tmpline = malloc(header.width);
 608         int i,x,y;
 609         int pos=0;
 610         if(header.mode == 3) { // palette or grayscale?
 611             rgba = (RGBA*)malloc(palettelen*sizeof(RGBA));
 612             if(!palette) {
 613                 fprintf(stderr, "Error: No palette found!\n");
 614                 exit(1);
 615             }
 616             /* 24->32 bit conversion */
 617             for(i=0;i<palettelen;i++) {
 618                 rgba[i].r = palette[i*3+0];
 619                 rgba[i].g = palette[i*3+1];
 620                 rgba[i].b = palette[i*3+2];
 621                 if(alphapalette && i<alphapalettelen) {
 622                     rgba[i].a = alphapalette[i];
 623                     rgba[i].r = ((int)rgba[i].r*rgba[i].a)/255;
 624                     rgba[i].g = ((int)rgba[i].g*rgba[i].a)/255;
 625                     rgba[i].b = ((int)rgba[i].b*rgba[i].a)/255;
 626                 } else {
 627                     rgba[i].a = 255;
 628                 }
 629             }
 630         } else {
 631             palettelen = 256;
 632             rgba = (RGBA*)malloc(palettelen*sizeof(RGBA));
 633             for(i=0;i<256;i++) {
 634                 rgba[i].r = i;
 635                 rgba[i].g = i;
 636                 rgba[i].b = i;
 637             }
 638         }
 639
 640         for(y=0;y<header.height;y++) {
 641             int mode = imagedata[pos++]; //filter mode
 642             U8*old;
 643             U8*dest = &data2[y*swf_width];
 644             U8*src;
 645             src = &imagedata[pos];
 646             if(header.bpp == 8) {
 647                 pos+=header.width;
 648             } else {
 649                 int x,s=0;
 650                 int bitpos = 0;
 651                 U32 v = (1<<header.bpp)-1;
 652                 for(x=0;x<header.width;x++) {
 653                     U32 r = src[s/8]<<8 |
 654                             src[s/8+1];
 655                     int t;
 656                     tmpline[x] = (r>>(16-header.bpp-(s&7)))&v;
 657                     s+=header.bpp;
 658                 }
 659                 src = tmpline;
 660                 pos+=(header.width*header.bpp+7)/8;
 661             }
 662
 663             if(!y) {
 664                 memset(data2,0,swf_width);
 665                 old = &data2[y*swf_width];
 666             } else {
 667                 old = &data2[(y-1)*swf_width];
 668             }
 669             applyfilter1(mode, src, old, dest, header.width);
 670         }
 671         swf_SetLosslessBitsIndexed(t, header.width, header.height, data2, rgba, palettelen);
 672         free(tmpline);
 673         free(rgba);
 674         free(data2);
 675     }
 676
 677     while(t->len < 64) {
 678         swf_SetU8(t, 0); //fix for flash player bug- see ../lib/modules/swfbits.c
 679     }
 680
 681     t = swf_InsertTag(t, ST_DEFINESHAPE3);
 682
 683     swf_ShapeNew(&s);
 684     swf_GetMatrix(NULL, &m);
 685     m.sx = 20 * 0x10000;
 686     m.sy = 20 * 0x10000;
 687     fs = swf_ShapeAddBitmapFillStyle(s, &m, id, 0);
 688
 689     swf_SetU16(t, id + 1);      // id
 690
 691     r.xmin = r.ymin = 0;
 692     r.xmax = header.width * 20;
 693     r.ymax = header.height * 20;
 694     swf_SetRect(t, &r);
 695
 696     swf_SetShapeHeader(t, s);
 697
 698     swf_ShapeSetAll(t, s, 0, 0, 0, fs, 0);
 699     swf_ShapeSetLine(t, s, r.xmax, 0);
 700     swf_ShapeSetLine(t, s, 0, r.ymax);
 701     swf_ShapeSetLine(t, s, -r.xmax, 0);
 702     swf_ShapeSetLine(t, s, 0, -r.ymax);
 703
 704     swf_ShapeSetEnd(t);
 705
 706     t = swf_InsertTag(t, ST_REMOVEOBJECT2);
 707     swf_SetU16(t, 50);          // depth
 708
 709     t = swf_InsertTag(t, ST_PLACEOBJECT2);
 710
 711     swf_GetMatrix(NULL, &m);
 712     m.tx = (swf->movieSize.xmax - (int) header.width * 20) / 2;
 713     m.ty = (swf->movieSize.ymax - (int) header.height * 20) / 2;
 714     swf_ObjectPlace(t, id + 1, 50, &m, NULL, NULL);
 715
 716     t = swf_InsertTag(t, ST_SHOWFRAME);
 717
 718     fclose(fi);
 719
 720     return t;
 721 }
 722
 723
 724 int CheckInputFile(char *fname, char **realname)
 725 {
 726     FILE *fi;
 727     char *s = malloc(strlen(fname) + 5);
 728     struct png_header head;
 729
 730     if (!s)
 731         exit(2);
 732     (*realname) = s;
 733     strcpy(s, fname);
 734
 735     // Check whether file exists (with typical extensions)
 736
 737     if ((fi = fopen(s, "rb")) == NULL) {
 738         sprintf(s, "%s.png", fname);
 739         if ((fi = fopen(s, "rb")) == NULL) {
 740             sprintf(s, "%s.PNG", fname);
 741             if ((fi = fopen(s, "rb")) == NULL) {
 742                 sprintf(s, "%s.Png", fname);
 743                 if ((fi = fopen(s, "rb")) == NULL)
 744                     fprintf(stderr, "Couldn't open %s!\n", fname);
 745                     return -1;
 746             }
 747         }
 748     }
 749
 750     if(!png_read_header(fi, &head)) {
 751         fprintf(stderr, "%s is not a PNG file!\n", fname);
 752         return -1;
 753     }
 754
 755     if (global.max_image_width < head.width)
 756         global.max_image_width = head.width;
 757     if (global.max_image_height < head.height)
 758         global.max_image_height = head.height;
 759
 760     fclose(fi);
 761
 762     return 0;
 763 }
 764
 765 int args_callback_option(char *arg, char *val)
 766 {
 767     int res = 0;
 768     if (arg[1])
 769         res = -1;
 770     else
 771         switch (arg[0]) {
 772         case 'r':
 773             if (val)
 774                 global.framerate = atof(val);
 775             if ((global.framerate < 1.0/256) ||(global.framerate >= 256.0)) {
 776                 if (VERBOSE(1))
 777                     fprintf(stderr,
 778                             "Error: You must specify a valid framerate between 1/256 and 255.\n");
 779                 exit(1);
 780             }
 781             res = 1;
 782             break;
 783
 784         case 'o':
 785             if (val)
 786                 global.outfile = val;
 787             res = 1;
 788             break;
 789
 790         case 'C':
 791             global.do_cgi = 1;
 792             break;
 793
 794         case 'v':
 795             if (val)
 796                 global.verbose = atoi(val);
 797             res = 1;
 798             break;
 799
 800         case 'X':
 801             if (val)
 802                 global.force_width = atoi(val);
 803             res = 1;
 804             break;
 805
 806         case 'Y':
 807             if (val)
 808                 global.force_height = atoi(val);
 809             res = 1;
 810             break;
 811
 812         case 'V':
 813             printf("png2swf - part of %s %s\n", PACKAGE, VERSION);
 814             exit(0);
 815
 816         default:
 817             res = -1;
 818             break;
 819         }
 820
 821     if (res < 0) {
 822         if (VERBOSE(1))
 823             fprintf(stderr, "Unknown option: -%s\n", arg);
 824         exit(1);
 825         return 0;
 826     }
 827     return res;
 828 }
 829
 830 static struct options_t options[] = {
 831 {"r", "rate"},
 832 {"o", "output"},
 833 {"X", "pixel"},
 834 {"Y", "pixel"},
 835 {"v", "verbose"},
 836 {"C", "cgi"},
 837 {"V", "version"},
 838 {0,0}
 839 };
 840
 841 int args_callback_longoption(char *name, char *val)
 842 {
 843     return args_long2shortoption(options, name, val);
 844 }
 845
 846 int args_callback_command(char *arg, char *next)        // actually used as filename
 847 {
 848     char *s;
 849     if (CheckInputFile(arg, &s) < 0) {
 850         if (VERBOSE(1))
 851             fprintf(stderr, "Error opening input file: %s\n", arg);
 852         free(s);
 853     } else {
 854         image[global.nfiles].filename = s;
 855         global.nfiles++;
 856         if (global.nfiles >= MAX_INPUT_FILES) {
 857             if (VERBOSE(1))
 858                 fprintf(stderr, "Error: Too many input files.\n");
 859             exit(1);
 860         }
 861     }
 862     return 0;
 863 }
 864
 865 void args_callback_usage(char *name)
 866 {
 867     printf("\n");
 868     printf("Usage: %s [-X width] [-Y height] [-o file.swf] [-r rate] file1.png [file2.png...]\n", name);
 869     printf("\n");
 870     printf("-r , --rate <framerate>        Set movie framerate (frames per second)\n");
 871     printf("-o , --output <filename>       Set name for SWF output file.\n");
 872     printf("-X , --pixel <width>           Force movie width to <width> (default: autodetect)\n");
 873     printf("-Y , --pixel <height>          Force movie height to <height> (default: autodetect)\n");
 874     printf("-v , --verbose <level>         Set verbose level (0=quiet, 1=default, 2=debug)\n");
 875     printf("-C , --cgi                     For use as CGI- prepend http header, write to stdout\n");
 876     printf("-V , --version                 Print version information and exit\n");
 877     printf("\n");
 878 }
 879
 880 int main(int argc, char **argv)
 881 {
 882     SWF swf;
 883     TAG *t;
 884
 885     memset(&global, 0x00, sizeof(global));
 886
 887     global.framerate = 1.0;
 888     global.verbose = 1;
 889
 890     processargs(argc, argv);
 891
 892     if(global.nfiles<=0)
 893         return 1;
 894
 895     if (VERBOSE(2))
 896         fprintf(stderr, "Processing %i file(s)...\n", global.nfiles);
 897
 898     t = MovieStart(&swf, global.framerate,
 899                    global.force_width ? global.force_width : global.
 900                    max_image_width,
 901                    global.force_height ? global.force_height : global.
 902                    max_image_height);
 903
 904     {
 905         int i;
 906         for (i = 0; i < global.nfiles; i++) {
 907             if (VERBOSE(3))
 908                 fprintf(stderr, "[%03i] %s\n", i,
 909                         image[i].filename);
 910             t = MovieAddFrame(&swf, t, image[i].filename, (i * 2) + 1);
 911             free(image[i].filename);
 912         }
 913     }
 914
 915     MovieFinish(&swf, t, global.outfile);
 916
 917     return 0;
 918 }