image.c

   1
   2 #include "quakedef.h"
   3
   4 int             image_width;
   5 int             image_height;
   6
   7 void Image_GammaRemapRGB(qbyte *in, qbyte *out, int pixels, qbyte *gammar, qbyte *gammag, qbyte *gammab)
   8 {
   9         while (pixels--)
  10         {
  11                 out[0] = gammar[in[0]];
  12                 out[1] = gammag[in[1]];
  13                 out[2] = gammab[in[2]];
  14                 in += 3;
  15                 out += 3;
  16         }
  17 }
  18
  19 // note: pal must be 32bit color
  20 void Image_Copy8bitRGBA(qbyte *in, qbyte *out, int pixels, int *pal)
  21 {
  22         int *iout = (void *)out;
  23         while (pixels >= 8)
  24         {
  25                 iout[0] = pal[in[0]];
  26                 iout[1] = pal[in[1]];
  27                 iout[2] = pal[in[2]];
  28                 iout[3] = pal[in[3]];
  29                 iout[4] = pal[in[4]];
  30                 iout[5] = pal[in[5]];
  31                 iout[6] = pal[in[6]];
  32                 iout[7] = pal[in[7]];
  33                 in += 8;
  34                 iout += 8;
  35                 pixels -= 8;
  36         }
  37         if (pixels & 4)
  38         {
  39                 iout[0] = pal[in[0]];
  40                 iout[1] = pal[in[1]];
  41                 iout[2] = pal[in[2]];
  42                 iout[3] = pal[in[3]];
  43                 in += 4;
  44                 iout += 4;
  45         }
  46         if (pixels & 2)
  47         {
  48                 iout[0] = pal[in[0]];
  49                 iout[1] = pal[in[1]];
  50                 in += 2;
  51                 iout += 2;
  52         }
  53         if (pixels & 1)
  54                 iout[0] = pal[in[0]];
  55 }
  56
  57 /*
  58 =================================================================
  59
  60   PCX Loading
  61
  62 =================================================================
  63 */
  64
  65 typedef struct
  66 {
  67     char        manufacturer;
  68     char        version;
  69     char        encoding;
  70     char        bits_per_pixel;
  71     unsigned short      xmin,ymin,xmax,ymax;
  72     unsigned short      hres,vres;
  73     unsigned char       palette[48];
  74     char        reserved;
  75     char        color_planes;
  76     unsigned short      bytes_per_line;
  77     unsigned short      palette_type;
  78     char        filler[58];
  79 } pcx_t;
  80
  81 /*
  82 ============
  83 LoadPCX
  84 ============
  85 */
  86 qbyte* LoadPCX (qbyte *f, int matchwidth, int matchheight)
  87 {
  88         pcx_t pcx;
  89         qbyte *palette, *a, *b, *image_rgba, *fin, *pbuf, *enddata;
  90         int x, y, x2, dataByte;
  91
  92         if (loadsize < sizeof(pcx) + 768)
  93         {
  94                 Con_Printf ("Bad pcx file\n");
  95                 return NULL;
  96         }
  97
  98         fin = f;
  99
 100         memcpy(&pcx, fin, sizeof(pcx));
 101         fin += sizeof(pcx);
 102
 103         // LordHavoc: big-endian support ported from QF newtree
 104         pcx.xmax = LittleShort (pcx.xmax);
 105         pcx.xmin = LittleShort (pcx.xmin);
 106         pcx.ymax = LittleShort (pcx.ymax);
 107         pcx.ymin = LittleShort (pcx.ymin);
 108         pcx.hres = LittleShort (pcx.hres);
 109         pcx.vres = LittleShort (pcx.vres);
 110         pcx.bytes_per_line = LittleShort (pcx.bytes_per_line);
 111         pcx.palette_type = LittleShort (pcx.palette_type);
 112
 113         if (pcx.manufacturer != 0x0a || pcx.version != 5 || pcx.encoding != 1 || pcx.bits_per_pixel != 8 || pcx.xmax > 320 || pcx.ymax > 256)
 114         {
 115                 Con_Printf ("Bad pcx file\n");
 116                 return NULL;
 117         }
 118
 119         if (matchwidth && (pcx.xmax+1) != matchwidth)
 120         {
 121                 return NULL;
 122         }
 123         if (matchheight && (pcx.ymax+1) != matchheight)
 124         {
 125                 return NULL;
 126         }
 127
 128         image_width = pcx.xmax+1;
 129         image_height = pcx.ymax+1;
 130
 131         palette = f + loadsize - 768;
 132
 133         image_rgba = Mem_Alloc(tempmempool, image_width*image_height*4);
 134         if (!image_rgba)
 135         {
 136                 Con_Printf("LoadPCX: not enough memory for %i by %i image\n", image_width, image_height);
 137                 return NULL;
 138         }
 139         pbuf = image_rgba + image_width*image_height*3;
 140         enddata = palette;
 141
 142         for (y = 0;y < image_height && fin < enddata;y++)
 143         {
 144                 a = pbuf + y * image_width;
 145                 for (x = 0;x < image_width && fin < enddata;)
 146                 {
 147                         dataByte = *fin++;
 148                         if(dataByte >= 0xC0)
 149                         {
 150                                 if (fin >= enddata)
 151                                         break;
 152                                 x2 = x + (dataByte & 0x3F);
 153                                 dataByte = *fin++;
 154                                 if (x2 > image_width)
 155                                         x2 = image_width; // technically an error
 156                                 while(x < x2)
 157                                         a[x++] = dataByte;
 158                         }
 159                         else
 160                                 a[x++] = dataByte;
 161                 }
 162                 fin += pcx.bytes_per_line - image_width; // the number of bytes per line is always forced to an even number
 163                 while(x < image_width)
 164                         a[x++] = 0;
 165         }
 166
 167         a = image_rgba;
 168         b = pbuf;
 169
 170         for(x = 0;x < image_width*image_height;x++)
 171         {
 172                 y = *b++ * 3;
 173                 *a++ = palette[y];
 174                 *a++ = palette[y+1];
 175                 *a++ = palette[y+2];
 176                 *a++ = 255;
 177         }
 178
 179         return image_rgba;
 180 }
 181
 182 /*
 183 =========================================================
 184
 185 TARGA LOADING
 186
 187 =========================================================
 188 */
 189
 190 typedef struct _TargaHeader
 191 {
 192         unsigned char   id_length, colormap_type, image_type;
 193         unsigned short  colormap_index, colormap_length;
 194         unsigned char   colormap_size;
 195         unsigned short  x_origin, y_origin, width, height;
 196         unsigned char   pixel_size, attributes;
 197 }
 198 TargaHeader;
 199
 200 TargaHeader             targa_header;
 201
 202
 203 /*
 204 =============
 205 LoadTGA
 206 =============
 207 */
 208 qbyte *LoadTGA (qbyte *f, int matchwidth, int matchheight)
 209 {
 210         int columns, rows, row, column, row_inc;
 211         qbyte *pixbuf, *image_rgba, *fin, *enddata;
 212
 213         if (loadsize < 18+3)
 214                 return NULL;
 215         targa_header.id_length = f[0];
 216         targa_header.colormap_type = f[1];
 217         targa_header.image_type = f[2];
 218
 219         targa_header.colormap_index = f[3] + f[4] * 256;
 220         targa_header.colormap_length = f[5] + f[6] * 256;
 221         targa_header.colormap_size = f[7];
 222         targa_header.x_origin = f[8] + f[9] * 256;
 223         targa_header.y_origin = f[10] + f[11] * 256;
 224         targa_header.width = f[12] + f[13] * 256;
 225         targa_header.height = f[14] + f[15] * 256;
 226         if (matchwidth && targa_header.width != matchwidth)
 227                 return NULL;
 228         if (matchheight && targa_header.height != matchheight)
 229                 return NULL;
 230         targa_header.pixel_size = f[16];
 231         targa_header.attributes = f[17];
 232
 233         if (targa_header.image_type != 2 && targa_header.image_type != 10)
 234         {
 235                 Con_Printf ("LoadTGA: Only type 2 and 10 targa RGB images supported\n");
 236                 return NULL;
 237         }
 238
 239         if (targa_header.colormap_type != 0     || (targa_header.pixel_size != 32 && targa_header.pixel_size != 24))
 240         {
 241                 Con_Printf ("LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
 242                 return NULL;
 243         }
 244
 245         enddata = f + loadsize;
 246
 247         columns = targa_header.width;
 248         rows = targa_header.height;
 249
 250         image_rgba = Mem_Alloc(tempmempool, columns * rows * 4);
 251         if (!image_rgba)
 252         {
 253                 Con_Printf ("LoadTGA: not enough memory for %i by %i image\n", columns, rows);
 254                 return NULL;
 255         }
 256
 257         fin = f + 18;
 258         if (targa_header.id_length != 0)
 259                 fin += targa_header.id_length;  // skip TARGA image comment
 260
 261         // If bit 5 of attributes isn't set, the image has been stored from bottom to top
 262         if ((targa_header.attributes & 0x20) == 0)
 263         {
 264                 pixbuf = image_rgba + (rows - 1)*columns*4;
 265                 row_inc = -columns*4*2;
 266         }
 267         else
 268         {
 269                 pixbuf = image_rgba;
 270                 row_inc = 0;
 271         }
 272
 273         if (targa_header.image_type == 2)
 274         {
 275                 // Uncompressed, RGB images
 276                 for(row = 0;row < rows;row++)
 277                 {
 278                         for(column = 0;column < columns;column++)
 279                         {
 280                                 switch (targa_header.pixel_size)
 281                                 {
 282                                 case 24:
 283                                         if (fin + 3 > enddata)
 284                                                 break;
 285                                         *pixbuf++ = fin[2];
 286                                         *pixbuf++ = fin[1];
 287                                         *pixbuf++ = fin[0];
 288                                         *pixbuf++ = 255;
 289                                         fin += 3;
 290                                         break;
 291                                 case 32:
 292                                         if (fin + 4 > enddata)
 293                                                 break;
 294                                         *pixbuf++ = fin[2];
 295                                         *pixbuf++ = fin[1];
 296                                         *pixbuf++ = fin[0];
 297                                         *pixbuf++ = fin[3];
 298                                         fin += 4;
 299                                         break;
 300                                 }
 301                         }
 302                         pixbuf += row_inc;
 303                 }
 304         }
 305         else if (targa_header.image_type==10)
 306         {
 307                 // Runlength encoded RGB images
 308                 unsigned char red = 0, green = 0, blue = 0, alphabyte = 0, packetHeader, packetSize, j;
 309                 for(row = 0;row < rows;row++)
 310                 {
 311                         for(column = 0;column < columns;)
 312                         {
 313                                 if (fin >= enddata)
 314                                         goto outofdata;
 315                                 packetHeader = *fin++;
 316                                 packetSize = 1 + (packetHeader & 0x7f);
 317                                 if (packetHeader & 0x80)
 318                                 {
 319                                         // run-length packet
 320                                         switch (targa_header.pixel_size)
 321                                         {
 322                                         case 24:
 323                                                 if (fin + 3 > enddata)
 324                                                         goto outofdata;
 325                                                 blue = *fin++;
 326                                                 green = *fin++;
 327                                                 red = *fin++;
 328                                                 alphabyte = 255;
 329                                                 break;
 330                                         case 32:
 331                                                 if (fin + 4 > enddata)
 332                                                         goto outofdata;
 333                                                 blue = *fin++;
 334                                                 green = *fin++;
 335                                                 red = *fin++;
 336                                                 alphabyte = *fin++;
 337                                                 break;
 338                                         }
 339
 340                                         for(j = 0;j < packetSize;j++)
 341                                         {
 342                                                 *pixbuf++ = red;
 343                                                 *pixbuf++ = green;
 344                                                 *pixbuf++ = blue;
 345                                                 *pixbuf++ = alphabyte;
 346                                                 column++;
 347                                                 if (column == columns)
 348                                                 {
 349                                                         // run spans across rows
 350                                                         column = 0;
 351                                                         if (row < rows - 1)
 352                                                                 row++;
 353                                                         else
 354                                                                 goto breakOut;
 355                                                         pixbuf += row_inc;
 356                                                 }
 357                                         }
 358                                 }
 359                                 else
 360                                 {
 361                                         // non run-length packet
 362                                         for(j = 0;j < packetSize;j++)
 363                                         {
 364                                                 switch (targa_header.pixel_size)
 365                                                 {
 366                                                 case 24:
 367                                                         if (fin + 3 > enddata)
 368                                                                 goto outofdata;
 369                                                         *pixbuf++ = fin[2];
 370                                                         *pixbuf++ = fin[1];
 371                                                         *pixbuf++ = fin[0];
 372                                                         *pixbuf++ = 255;
 373                                                         fin += 3;
 374                                                         break;
 375                                                 case 32:
 376                                                         if (fin + 4 > enddata)
 377                                                                 goto outofdata;
 378                                                         *pixbuf++ = fin[2];
 379                                                         *pixbuf++ = fin[1];
 380                                                         *pixbuf++ = fin[0];
 381                                                         *pixbuf++ = fin[3];
 382                                                         fin += 4;
 383                                                         break;
 384                                                 }
 385                                                 column++;
 386                                                 if (column == columns)
 387                                                 {
 388                                                         // pixel packet run spans across rows
 389                                                         column = 0;
 390                                                         if (row < rows - 1)
 391                                                                 row++;
 392                                                         else
 393                                                                 goto breakOut;
 394                                                         pixbuf += row_inc;
 395                                                 }
 396                                         }
 397                                 }
 398                         }
 399                         pixbuf += row_inc;
 400                         breakOut:;
 401                 }
 402         }
 403 outofdata:;
 404
 405         image_width = columns;
 406         image_height = rows;
 407         return image_rgba;
 408 }
 409
 410 /*
 411 ============
 412 LoadLMP
 413 ============
 414 */
 415 qbyte *LoadLMP (qbyte *f, int matchwidth, int matchheight)
 416 {
 417         qbyte *image_rgba;
 418         int width, height;
 419
 420         if (loadsize < 9)
 421         {
 422                 Con_Printf("LoadLMP: invalid LMP file\n");
 423                 return NULL;
 424         }
 425
 426         // parse the very complicated header *chuckle*
 427         width = f[0] + f[1] * 256 + f[2] * 65536 + f[3] * 16777216;
 428         height = f[4] + f[5] * 256 + f[6] * 65536 + f[7] * 16777216;
 429         if ((unsigned) width > 4096 || (unsigned) height > 4096)
 430         {
 431                 Con_Printf("LoadLMP: invalid size\n");
 432                 return NULL;
 433         }
 434         if ((matchwidth && width != matchwidth) || (matchheight && height != matchheight))
 435                 return NULL;
 436
 437         if (loadsize < 8 + width * height)
 438         {
 439                 Con_Printf("LoadLMP: invalid LMP file\n");
 440                 return NULL;
 441         }
 442
 443         image_width = width;
 444         image_height = height;
 445
 446         image_rgba = Mem_Alloc(tempmempool, image_width * image_height * 4);
 447         if (!image_rgba)
 448         {
 449                 Con_Printf("LoadLMP: not enough memory for %i by %i image\n", image_width, image_height);
 450                 return NULL;
 451         }
 452         Image_Copy8bitRGBA(f + 8, image_rgba, image_width * image_height, d_8to24table);
 453         return image_rgba;
 454 }
 455
 456 /*
 457 ============
 458 LoadLMP
 459 ============
 460 */
 461 qbyte *LoadLMPAs8Bit (qbyte *f, int matchwidth, int matchheight)
 462 {
 463         qbyte *image_8bit;
 464         int width, height;
 465
 466         if (loadsize < 9)
 467         {
 468                 Con_Printf("LoadLMPAs8Bit: invalid LMP file\n");
 469                 return NULL;
 470         }
 471
 472         // parse the very complicated header *chuckle*
 473         width = f[0] + f[1] * 256 + f[2] * 65536 + f[3] * 16777216;
 474         height = f[4] + f[5] * 256 + f[6] * 65536 + f[7] * 16777216;
 475         if ((unsigned) width > 4096 || (unsigned) height > 4096)
 476         {
 477                 Con_Printf("LoadLMPAs8Bit: invalid size\n");
 478                 return NULL;
 479         }
 480         if ((matchwidth && width != matchwidth) || (matchheight && height != matchheight))
 481                 return NULL;
 482
 483         if (loadsize < 8 + width * height)
 484         {
 485                 Con_Printf("LoadLMPAs8Bit: invalid LMP file\n");
 486                 return NULL;
 487         }
 488
 489         image_width = width;
 490         image_height = height;
 491
 492         image_8bit = Mem_Alloc(tempmempool, image_width * image_height);
 493         if (!image_8bit)
 494         {
 495                 Con_Printf("LoadLMPAs8Bit: not enough memory for %i by %i image\n", image_width, image_height);
 496                 return NULL;
 497         }
 498         memcpy(image_8bit, f + 8, image_width * image_height);
 499         return image_8bit;
 500 }
 501
 502 void Image_StripImageExtension (char *in, char *out)
 503 {
 504         char *end, *temp;
 505         end = in + strlen(in);
 506         if ((end - in) >= 4)
 507         {
 508                 temp = end - 4;
 509                 if (strcmp(temp, ".tga") == 0 || strcmp(temp, ".pcx") == 0 || strcmp(temp, ".lmp") == 0)
 510                         end = temp;
 511                 while (in < end)
 512                         *out++ = *in++;
 513                 *out++ = 0;
 514         }
 515         else
 516                 strcpy(out, in);
 517 }
 518
 519 qbyte *loadimagepixels (char *filename, qboolean complain, int matchwidth, int matchheight)
 520 {
 521         qbyte *f, *data;
 522         char basename[256], name[256], *c;
 523         Image_StripImageExtension(filename, basename); // strip .tga, .pcx and .lmp extensions to allow replacement by other types
 524         // replace *'s with #, so commandline utils don't get confused when dealing with the external files
 525         for (c = basename;*c;c++)
 526                 if (*c == '*')
 527                         *c = '#';
 528         sprintf (name, "textures/%s.tga", basename);
 529         f = COM_LoadFile(name, true);
 530         if (f)
 531         {
 532                 data = LoadTGA (f, matchwidth, matchheight);
 533                 Mem_Free(f);
 534                 return data;
 535         }
 536         sprintf (name, "textures/%s.pcx", basename);
 537         f = COM_LoadFile(name, true);
 538         if (f)
 539         {
 540                 data = LoadPCX (f, matchwidth, matchheight);
 541                 Mem_Free(f);
 542                 return data;
 543         }
 544         sprintf (name, "%s.tga", basename);
 545         f = COM_LoadFile(name, true);
 546         if (f)
 547         {
 548                 data = LoadTGA (f, matchwidth, matchheight);
 549                 Mem_Free(f);
 550                 return data;
 551         }
 552         sprintf (name, "%s.pcx", basename);
 553         f = COM_LoadFile(name, true);
 554         if (f)
 555         {
 556                 data = LoadPCX (f, matchwidth, matchheight);
 557                 Mem_Free(f);
 558                 return data;
 559         }
 560         sprintf (name, "%s.lmp", basename);
 561         f = COM_LoadFile(name, true);
 562         if (f)
 563         {
 564                 data = LoadLMP (f, matchwidth, matchheight);
 565                 Mem_Free(f);
 566                 return data;
 567         }
 568         if (complain)
 569                 Con_Printf ("Couldn't load %s.tga, .pcx, .lmp\n", filename);
 570         return NULL;
 571 }
 572
 573 int image_makemask (qbyte *in, qbyte *out, int size)
 574 {
 575         int             i, count;
 576         count = 0;
 577         for (i = 0;i < size;i++)
 578         {
 579                 out[0] = out[1] = out[2] = 255;
 580                 out[3] = in[3];
 581                 if (in[3] != 255)
 582                         count++;
 583                 in += 4;
 584                 out += 4;
 585         }
 586         return count;
 587 }
 588
 589 qbyte* loadimagepixelsmask (char* filename, qboolean complain, int matchwidth, int matchheight)
 590 {
 591         qbyte *in, *data;
 592         in = data = loadimagepixels(filename, complain, matchwidth, matchheight);
 593         if (!data)
 594                 return NULL;
 595         if (image_makemask(data, data, image_width * image_height))
 596                 return data; // some transparency
 597         else
 598         {
 599                 Mem_Free(data);
 600                 return NULL; // all opaque
 601         }
 602 }
 603
 604 rtexture_t *loadtextureimage (rtexturepool_t *pool, char* filename, int matchwidth, int matchheight, qboolean complain, qboolean mipmap, qboolean precache)
 605 {
 606         qbyte *data;
 607         rtexture_t *rt;
 608         if (!(data = loadimagepixels (filename, complain, matchwidth, matchheight)))
 609                 return 0;
 610         rt = R_LoadTexture (pool, filename, image_width, image_height, data, TEXTYPE_RGBA, TEXF_ALPHA | (mipmap ? TEXF_MIPMAP : 0) | (precache ? TEXF_PRECACHE : 0));
 611         Mem_Free(data);
 612         return rt;
 613 }
 614
 615 rtexture_t *loadtextureimagemask (rtexturepool_t *pool, char* filename, int matchwidth, int matchheight, qboolean complain, qboolean mipmap, qboolean precache)
 616 {
 617         qbyte *data;
 618         rtexture_t *rt;
 619         if (!(data = loadimagepixelsmask (filename, complain, matchwidth, matchheight)))
 620                 return 0;
 621         rt = R_LoadTexture (pool, filename, image_width, image_height, data, TEXTYPE_RGBA, TEXF_ALPHA | (mipmap ? TEXF_MIPMAP : 0) | (precache ? TEXF_PRECACHE : 0));
 622         Mem_Free(data);
 623         return rt;
 624 }
 625
 626 rtexture_t *image_masktex;
 627 rtexture_t *loadtextureimagewithmask (rtexturepool_t *pool, char* filename, int matchwidth, int matchheight, qboolean complain, qboolean mipmap, qboolean precache)
 628 {
 629         int count;
 630         qbyte *data;
 631         char *filename2;
 632         rtexture_t *rt;
 633         image_masktex = NULL;
 634         if (!(data = loadimagepixels (filename, complain, matchwidth, matchheight)))
 635                 return 0;
 636         rt = R_LoadTexture (pool, filename, image_width, image_height, data, TEXTYPE_RGBA, TEXF_ALPHA | (mipmap ? TEXF_MIPMAP : 0) | (precache ? TEXF_PRECACHE : 0));
 637         count = image_makemask(data, data, image_width * image_height);
 638         if (count)
 639         {
 640                 filename2 = Mem_Alloc(tempmempool, strlen(filename) + 6);
 641                 sprintf(filename2, "%s_mask", filename);
 642                 image_masktex = R_LoadTexture (pool, filename2, image_width, image_height, data, TEXTYPE_RGBA, TEXF_ALPHA | (mipmap ? TEXF_MIPMAP : 0) | (precache ? TEXF_PRECACHE : 0));
 643                 Mem_Free(filename2);
 644         }
 645         Mem_Free(data);
 646         return rt;
 647 }
 648
 649 qboolean Image_WriteTGARGB_preflipped (char *filename, int width, int height, qbyte *data)
 650 {
 651         qboolean ret;
 652         qbyte *buffer, *in, *out, *end;
 653
 654         buffer = Mem_Alloc(tempmempool, width*height*3 + 18);
 655
 656         memset (buffer, 0, 18);
 657         buffer[2] = 2;          // uncompressed type
 658         buffer[12] = (width >> 0) & 0xFF;
 659         buffer[13] = (width >> 8) & 0xFF;
 660         buffer[14] = (height >> 0) & 0xFF;
 661         buffer[15] = (height >> 8) & 0xFF;
 662         buffer[16] = 24;        // pixel size
 663
 664         // swap rgb to bgr
 665         in = data;
 666         out = buffer + 18;
 667         end = in + width*height*3;
 668         for (;in < end;in += 3)
 669         {
 670                 *out++ = in[2];
 671                 *out++ = in[1];
 672                 *out++ = in[0];
 673         }
 674         ret = COM_WriteFile (filename, buffer, width*height*3 + 18 );
 675
 676         Mem_Free(buffer);
 677         return ret;
 678 }
 679
 680 void Image_WriteTGARGB (char *filename, int width, int height, qbyte *data)
 681 {
 682         int y;
 683         qbyte *buffer, *in, *out, *end;
 684
 685         buffer = Mem_Alloc(tempmempool, width*height*3 + 18);
 686
 687         memset (buffer, 0, 18);
 688         buffer[2] = 2;          // uncompressed type
 689         buffer[12] = (width >> 0) & 0xFF;
 690         buffer[13] = (width >> 8) & 0xFF;
 691         buffer[14] = (height >> 0) & 0xFF;
 692         buffer[15] = (height >> 8) & 0xFF;
 693         buffer[16] = 24;        // pixel size
 694
 695         // swap rgb to bgr and flip upside down
 696         out = buffer + 18;
 697         for (y = height - 1;y >= 0;y--)
 698         {
 699                 in = data + y * width * 3;
 700                 end = in + width * 3;
 701                 for (;in < end;in += 3)
 702                 {
 703                         *out++ = in[2];
 704                         *out++ = in[1];
 705                         *out++ = in[0];
 706                 }
 707         }
 708         COM_WriteFile (filename, buffer, width*height*3 + 18 );
 709
 710         Mem_Free(buffer);
 711 }
 712
 713 void Image_WriteTGARGBA (char *filename, int width, int height, qbyte *data)
 714 {
 715         int y;
 716         qbyte *buffer, *in, *out, *end;
 717
 718         buffer = Mem_Alloc(tempmempool, width*height*4 + 18);
 719
 720         memset (buffer, 0, 18);
 721         buffer[2] = 2;          // uncompressed type
 722         buffer[12] = (width >> 0) & 0xFF;
 723         buffer[13] = (width >> 8) & 0xFF;
 724         buffer[14] = (height >> 0) & 0xFF;
 725         buffer[15] = (height >> 8) & 0xFF;
 726         buffer[16] = 32;        // pixel size
 727
 728         // swap rgba to bgra and flip upside down
 729         out = buffer + 18;
 730         for (y = height - 1;y >= 0;y--)
 731         {
 732                 in = data + y * width * 4;
 733                 end = in + width * 4;
 734                 for (;in < end;in += 4)
 735                 {
 736                         *out++ = in[2];
 737                         *out++ = in[1];
 738                         *out++ = in[0];
 739                         *out++ = in[3];
 740                 }
 741         }
 742         COM_WriteFile (filename, buffer, width*height*4 + 18 );
 743
 744         Mem_Free(buffer);
 745 }
 746
 747 qboolean Image_CheckAlpha(qbyte *data, int size, qboolean rgba)
 748 {
 749         qbyte *end;
 750         if (rgba)
 751         {
 752                 // check alpha bytes
 753                 for (end = data + size * 4, data += 3;data < end;data += 4)
 754                         if (*data < 255)
 755                                 return 1;
 756         }
 757         else
 758         {
 759                 // color 255 is transparent
 760                 for (end = data + size;data < end;data++)
 761                         if (*data == 255)
 762                                 return 1;
 763         }
 764         return 0;
 765 }
 766
 767 static void Image_Resample32LerpLine (qbyte *in, qbyte *out, int inwidth, int outwidth)
 768 {
 769         int             j, xi, oldx = 0, f, fstep, endx, lerp;
 770         fstep = (int) (inwidth*65536.0f/outwidth);
 771         endx = (inwidth-1);
 772         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 773         {
 774                 xi = f >> 16;
 775                 if (xi != oldx)
 776                 {
 777                         in += (xi - oldx) * 4;
 778                         oldx = xi;
 779                 }
 780                 if (xi < endx)
 781                 {
 782                         lerp = f & 0xFFFF;
 783                         *out++ = (qbyte) ((((in[4] - in[0]) * lerp) >> 16) + in[0]);
 784                         *out++ = (qbyte) ((((in[5] - in[1]) * lerp) >> 16) + in[1]);
 785                         *out++ = (qbyte) ((((in[6] - in[2]) * lerp) >> 16) + in[2]);
 786                         *out++ = (qbyte) ((((in[7] - in[3]) * lerp) >> 16) + in[3]);
 787                 }
 788                 else // last pixel of the line has no pixel to lerp to
 789                 {
 790                         *out++ = in[0];
 791                         *out++ = in[1];
 792                         *out++ = in[2];
 793                         *out++ = in[3];
 794                 }
 795         }
 796 }
 797
 798 static void Image_Resample24LerpLine (qbyte *in, qbyte *out, int inwidth, int outwidth)
 799 {
 800         int             j, xi, oldx = 0, f, fstep, endx, lerp;
 801         fstep = (int) (inwidth*65536.0f/outwidth);
 802         endx = (inwidth-1);
 803         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
 804         {
 805                 xi = f >> 16;
 806                 if (xi != oldx)
 807                 {
 808                         in += (xi - oldx) * 3;
 809                         oldx = xi;
 810                 }
 811                 if (xi < endx)
 812                 {
 813                         lerp = f & 0xFFFF;
 814                         *out++ = (qbyte) ((((in[3] - in[0]) * lerp) >> 16) + in[0]);
 815                         *out++ = (qbyte) ((((in[4] - in[1]) * lerp) >> 16) + in[1]);
 816                         *out++ = (qbyte) ((((in[5] - in[2]) * lerp) >> 16) + in[2]);
 817                 }
 818                 else // last pixel of the line has no pixel to lerp to
 819                 {
 820                         *out++ = in[0];
 821                         *out++ = in[1];
 822                         *out++ = in[2];
 823                 }
 824         }
 825 }
 826
 827 int resamplerowsize = 0;
 828 qbyte *resamplerow1 = NULL;
 829 qbyte *resamplerow2 = NULL;
 830 mempool_t *resamplemempool = NULL;
 831
 832 #define LERPBYTE(i) r = resamplerow1[i];out[i] = (qbyte) ((((resamplerow2[i] - r) * lerp) >> 16) + r)
 833 void Image_Resample32Lerp(void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
 834 {
 835         int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth4 = inwidth*4, outwidth4 = outwidth*4;
 836         qbyte *inrow, *out;
 837         out = outdata;
 838         fstep = (int) (inheight*65536.0f/outheight);
 839
 840         inrow = indata;
 841         oldy = 0;
 842         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
 843         Image_Resample32LerpLine (inrow + inwidth4, resamplerow2, inwidth, outwidth);
 844         for (i = 0, f = 0;i < outheight;i++,f += fstep)
 845         {
 846                 yi = f >> 16;
 847                 if (yi < endy)
 848                 {
 849                         lerp = f & 0xFFFF;
 850                         if (yi != oldy)
 851                         {
 852                                 inrow = (qbyte *)indata + inwidth4*yi;
 853                                 if (yi == oldy+1)
 854                                         memcpy(resamplerow1, resamplerow2, outwidth4);
 855                                 else
 856                                         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
 857                                 Image_Resample32LerpLine (inrow + inwidth4, resamplerow2, inwidth, outwidth);
 858                                 oldy = yi;
 859                         }
 860                         j = outwidth - 4;
 861                         while(j >= 0)
 862                         {
 863                                 LERPBYTE( 0);
 864                                 LERPBYTE( 1);
 865                                 LERPBYTE( 2);
 866                                 LERPBYTE( 3);
 867                                 LERPBYTE( 4);
 868                                 LERPBYTE( 5);
 869                                 LERPBYTE( 6);
 870                                 LERPBYTE( 7);
 871                                 LERPBYTE( 8);
 872                                 LERPBYTE( 9);
 873                                 LERPBYTE(10);
 874                                 LERPBYTE(11);
 875                                 LERPBYTE(12);
 876                                 LERPBYTE(13);
 877                                 LERPBYTE(14);
 878                                 LERPBYTE(15);
 879                                 out += 16;
 880                                 resamplerow1 += 16;
 881                                 resamplerow2 += 16;
 882                                 j -= 4;
 883                         }
 884                         if (j & 2)
 885                         {
 886                                 LERPBYTE( 0);
 887                                 LERPBYTE( 1);
 888                                 LERPBYTE( 2);
 889                                 LERPBYTE( 3);
 890                                 LERPBYTE( 4);
 891                                 LERPBYTE( 5);
 892                                 LERPBYTE( 6);
 893                                 LERPBYTE( 7);
 894                                 out += 8;
 895                                 resamplerow1 += 8;
 896                                 resamplerow2 += 8;
 897                         }
 898                         if (j & 1)
 899                         {
 900                                 LERPBYTE( 0);
 901                                 LERPBYTE( 1);
 902                                 LERPBYTE( 2);
 903                                 LERPBYTE( 3);
 904                                 out += 4;
 905                                 resamplerow1 += 4;
 906                                 resamplerow2 += 4;
 907                         }
 908                         resamplerow1 -= outwidth4;
 909                         resamplerow2 -= outwidth4;
 910                 }
 911                 else
 912                 {
 913                         if (yi != oldy)
 914                         {
 915                                 inrow = (qbyte *)indata + inwidth4*yi;
 916                                 if (yi == oldy+1)
 917                                         memcpy(resamplerow1, resamplerow2, outwidth4);
 918                                 else
 919                                         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
 920                                 oldy = yi;
 921                         }
 922                         memcpy(out, resamplerow1, outwidth4);
 923                 }
 924         }
 925 }
 926
 927 void Image_Resample32Nearest(void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
 928 {
 929         int i, j;
 930         unsigned frac, fracstep;
 931         // relies on int being 4 bytes
 932         int *inrow, *out;
 933         out = outdata;
 934
 935         fracstep = inwidth*0x10000/outwidth;
 936         for (i = 0;i < outheight;i++)
 937         {
 938                 inrow = (int *)indata + inwidth*(i*inheight/outheight);
 939                 frac = fracstep >> 1;
 940                 j = outwidth - 4;
 941                 while (j >= 0)
 942                 {
 943                         out[0] = inrow[frac >> 16];frac += fracstep;
 944                         out[1] = inrow[frac >> 16];frac += fracstep;
 945                         out[2] = inrow[frac >> 16];frac += fracstep;
 946                         out[3] = inrow[frac >> 16];frac += fracstep;
 947                         out += 4;
 948                         j -= 4;
 949                 }
 950                 if (j & 2)
 951                 {
 952                         out[0] = inrow[frac >> 16];frac += fracstep;
 953                         out[1] = inrow[frac >> 16];frac += fracstep;
 954                         out += 2;
 955                 }
 956                 if (j & 1)
 957                 {
 958                         out[0] = inrow[frac >> 16];frac += fracstep;
 959                         out += 1;
 960                 }
 961         }
 962 }
 963
 964 void Image_Resample24Lerp(void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
 965 {
 966         int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth3 = inwidth * 3, outwidth3 = outwidth * 3;
 967         qbyte *inrow, *out;
 968         out = outdata;
 969         fstep = (int) (inheight*65536.0f/outheight);
 970
 971         inrow = indata;
 972         oldy = 0;
 973         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
 974         Image_Resample24LerpLine (inrow + inwidth3, resamplerow2, inwidth, outwidth);
 975         for (i = 0, f = 0;i < outheight;i++,f += fstep)
 976         {
 977                 yi = f >> 16;
 978                 if (yi < endy)
 979                 {
 980                         lerp = f & 0xFFFF;
 981                         if (yi != oldy)
 982                         {
 983                                 inrow = (qbyte *)indata + inwidth3*yi;
 984                                 if (yi == oldy+1)
 985                                         memcpy(resamplerow1, resamplerow2, outwidth3);
 986                                 else
 987                                         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
 988                                 Image_Resample24LerpLine (inrow + inwidth3, resamplerow2, inwidth, outwidth);
 989                                 oldy = yi;
 990                         }
 991                         j = outwidth - 4;
 992                         while(j >= 0)
 993                         {
 994                                 LERPBYTE( 0);
 995                                 LERPBYTE( 1);
 996                                 LERPBYTE( 2);
 997                                 LERPBYTE( 3);
 998                                 LERPBYTE( 4);
 999                                 LERPBYTE( 5);
1000                                 LERPBYTE( 6);
1001                                 LERPBYTE( 7);
1002                                 LERPBYTE( 8);
1003                                 LERPBYTE( 9);
1004                                 LERPBYTE(10);
1005                                 LERPBYTE(11);
1006                                 out += 12;
1007                                 resamplerow1 += 12;
1008                                 resamplerow2 += 12;
1009                                 j -= 4;
1010                         }
1011                         if (j & 2)
1012                         {
1013                                 LERPBYTE( 0);
1014                                 LERPBYTE( 1);
1015                                 LERPBYTE( 2);
1016                                 LERPBYTE( 3);
1017                                 LERPBYTE( 4);
1018                                 LERPBYTE( 5);
1019                                 out += 6;
1020                                 resamplerow1 += 6;
1021                                 resamplerow2 += 6;
1022                         }
1023                         if (j & 1)
1024                         {
1025                                 LERPBYTE( 0);
1026                                 LERPBYTE( 1);
1027                                 LERPBYTE( 2);
1028                                 out += 3;
1029                                 resamplerow1 += 3;
1030                                 resamplerow2 += 3;
1031                         }
1032                         resamplerow1 -= outwidth3;
1033                         resamplerow2 -= outwidth3;
1034                 }
1035                 else
1036                 {
1037                         if (yi != oldy)
1038                         {
1039                                 inrow = (qbyte *)indata + inwidth3*yi;
1040                                 if (yi == oldy+1)
1041                                         memcpy(resamplerow1, resamplerow2, outwidth3);
1042                                 else
1043                                         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1044                                 oldy = yi;
1045                         }
1046                         memcpy(out, resamplerow1, outwidth3);
1047                 }
1048         }
1049 }
1050
1051 void Image_Resample24Nolerp(void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1052 {
1053         int i, j, f, inwidth3 = inwidth * 3;
1054         unsigned frac, fracstep;
1055         qbyte *inrow, *out;
1056         out = outdata;
1057
1058         fracstep = inwidth*0x10000/outwidth;
1059         for (i = 0;i < outheight;i++)
1060         {
1061                 inrow = (qbyte *)indata + inwidth3*(i*inheight/outheight);
1062                 frac = fracstep >> 1;
1063                 j = outwidth - 4;
1064                 while (j >= 0)
1065                 {
1066                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1067                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1068                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1069                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1070                         j -= 4;
1071                 }
1072                 if (j & 2)
1073                 {
1074                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1075                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1076                         out += 2;
1077                 }
1078                 if (j & 1)
1079                 {
1080                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1081                         out += 1;
1082                 }
1083         }
1084 }
1085
1086 /*
1087 ================
1088 Image_Resample
1089 ================
1090 */
1091 void Image_Resample (void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight, int bytesperpixel, int quality)
1092 {
1093         if (resamplerowsize < outwidth*4)
1094         {
1095                 if (resamplerow1)
1096                         Mem_Free(resamplerow1);
1097                 resamplerowsize = outwidth*4;
1098                 if (!resamplemempool)
1099                         resamplemempool = Mem_AllocPool("Image Scaling Buffer");
1100                 resamplerow1 = Mem_Alloc(resamplemempool, resamplerowsize*2);
1101                 resamplerow2 = resamplerow1 + resamplerowsize;
1102         }
1103         if (bytesperpixel == 4)
1104         {
1105                 if (quality)
1106                         Image_Resample32Lerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1107                 else
1108                         Image_Resample32Nearest(indata, inwidth, inheight, outdata, outwidth, outheight);
1109         }
1110         else if (bytesperpixel == 3)
1111         {
1112                 if (quality)
1113                         Image_Resample24Lerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1114                 else
1115                         Image_Resample24Nolerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1116         }
1117         else
1118                 Sys_Error("Image_Resample: unsupported bytesperpixel %i\n", bytesperpixel);
1119 }
1120
1121 // in can be the same as out
1122 void Image_MipReduce(qbyte *in, qbyte *out, int *width, int *height, int destwidth, int destheight, int bytesperpixel)
1123 {
1124         int x, y, nextrow;
1125         nextrow = *width * bytesperpixel;
1126         if (*width > destwidth)
1127         {
1128                 *width >>= 1;
1129                 if (*height > destheight)
1130                 {
1131                         // reduce both
1132                         *height >>= 1;
1133                         if (bytesperpixel == 4)
1134                         {
1135                                 for (y = 0;y < *height;y++)
1136                                 {
1137                                         for (x = 0;x < *width;x++)
1138                                         {
1139                                                 out[0] = (qbyte) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
1140                                                 out[1] = (qbyte) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
1141                                                 out[2] = (qbyte) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
1142                                                 out[3] = (qbyte) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
1143                                                 out += 4;
1144                                                 in += 8;
1145                                         }
1146                                         in += nextrow; // skip a line
1147                                 }
1148                         }
1149                         else if (bytesperpixel == 3)
1150                         {
1151                                 for (y = 0;y < *height;y++)
1152                                 {
1153                                         for (x = 0;x < *width;x++)
1154                                         {
1155                                                 out[0] = (qbyte) ((in[0] + in[3] + in[nextrow  ] + in[nextrow+3]) >> 2);
1156                                                 out[1] = (qbyte) ((in[1] + in[4] + in[nextrow+1] + in[nextrow+4]) >> 2);
1157                                                 out[2] = (qbyte) ((in[2] + in[5] + in[nextrow+2] + in[nextrow+5]) >> 2);
1158                                                 out += 3;
1159                                                 in += 6;
1160                                         }
1161                                         in += nextrow; // skip a line
1162                                 }
1163                         }
1164                         else
1165                                 Sys_Error("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1166                 }
1167                 else
1168                 {
1169                         // reduce width
1170                         if (bytesperpixel == 4)
1171                         {
1172                                 for (y = 0;y < *height;y++)
1173                                 {
1174                                         for (x = 0;x < *width;x++)
1175                                         {
1176                                                 out[0] = (qbyte) ((in[0] + in[4]) >> 1);
1177                                                 out[1] = (qbyte) ((in[1] + in[5]) >> 1);
1178                                                 out[2] = (qbyte) ((in[2] + in[6]) >> 1);
1179                                                 out[3] = (qbyte) ((in[3] + in[7]) >> 1);
1180                                                 out += 4;
1181                                                 in += 8;
1182                                         }
1183                                 }
1184                         }
1185                         else if (bytesperpixel == 3)
1186                         {
1187                                 for (y = 0;y < *height;y++)
1188                                 {
1189                                         for (x = 0;x < *width;x++)
1190                                         {
1191                                                 out[0] = (qbyte) ((in[0] + in[3]) >> 1);
1192                                                 out[1] = (qbyte) ((in[1] + in[4]) >> 1);
1193                                                 out[2] = (qbyte) ((in[2] + in[5]) >> 1);
1194                                                 out += 3;
1195                                                 in += 6;
1196                                         }
1197                                 }
1198                         }
1199                         else
1200                                 Sys_Error("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1201                 }
1202         }
1203         else
1204         {
1205                 if (*height > destheight)
1206                 {
1207                         // reduce height
1208                         *height >>= 1;
1209                         if (bytesperpixel == 4)
1210                         {
1211                                 for (y = 0;y < *height;y++)
1212                                 {
1213                                         for (x = 0;x < *width;x++)
1214                                         {
1215                                                 out[0] = (qbyte) ((in[0] + in[nextrow  ]) >> 1);
1216                                                 out[1] = (qbyte) ((in[1] + in[nextrow+1]) >> 1);
1217                                                 out[2] = (qbyte) ((in[2] + in[nextrow+2]) >> 1);
1218                                                 out[3] = (qbyte) ((in[3] + in[nextrow+3]) >> 1);
1219                                                 out += 4;
1220                                                 in += 4;
1221                                         }
1222                                         in += nextrow; // skip a line
1223                                 }
1224                         }
1225                         else if (bytesperpixel == 3)
1226                         {
1227                                 for (y = 0;y < *height;y++)
1228                                 {
1229                                         for (x = 0;x < *width;x++)
1230                                         {
1231                                                 out[0] = (qbyte) ((in[0] + in[nextrow  ]) >> 1);
1232                                                 out[1] = (qbyte) ((in[1] + in[nextrow+1]) >> 1);
1233                                                 out[2] = (qbyte) ((in[2] + in[nextrow+2]) >> 1);
1234                                                 out += 3;
1235                                                 in += 3;
1236                                         }
1237                                         in += nextrow; // skip a line
1238                                 }
1239                         }
1240                         else
1241                                 Sys_Error("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1242                 }
1243                 else
1244                         Sys_Error("Image_MipReduce: desired size already achieved\n");
1245         }
1246 }
1247