added an error message stating if an image file was loaded but decoding failed
[divverent/darkplaces.git] / image.c
1
2 #include "quakedef.h"
3 #include "image.h"
4 #include "jpeg.h"
5 #include "image_png.h"
6 #include "r_shadow.h"
7
8 int             image_width;
9 int             image_height;
10
11 #if 1
12 // written by LordHavoc in a readable way, optimized by Vic, further optimized by LordHavoc (the non-special index case), readable version preserved below this
13 void Image_CopyMux(unsigned char *outpixels, const unsigned char *inpixels, int inputwidth, int inputheight, qboolean inputflipx, qboolean inputflipy, qboolean inputflipdiagonal, int numoutputcomponents, int numinputcomponents, int *outputinputcomponentindices)
14 {
15         int index, c, x, y;
16         const unsigned char *in, *line;
17         int row_inc = (inputflipy ? -inputwidth : inputwidth) * numinputcomponents, col_inc = (inputflipx ? -1 : 1) * numinputcomponents;
18         int row_ofs = (inputflipy ? (inputheight - 1) * inputwidth * numinputcomponents : 0), col_ofs = (inputflipx ? (inputwidth - 1) * numinputcomponents : 0);
19
20         for (c = 0; c < numoutputcomponents; c++)
21                 if (outputinputcomponentindices[c] & 0x80000000)
22                         break;
23         if (c < numoutputcomponents)
24         {
25                 // special indices used
26                 if (inputflipdiagonal)
27                 {
28                         for (x = 0, line = inpixels + col_ofs; x < inputwidth; x++, line += col_inc)
29                                 for (y = 0, in = line + row_ofs; y < inputheight; y++, in += row_inc, outpixels += numinputcomponents)
30                                         for (c = 0; c < numoutputcomponents; c++)
31                                                 outpixels[c] = ((index = outputinputcomponentindices[c]) & 0x80000000) ? index : in[index];
32                 }
33                 else
34                 {
35                         for (y = 0, line = inpixels + row_ofs; y < inputheight; y++, line += row_inc)
36                                 for (x = 0, in = line + col_ofs; x < inputwidth; x++, in += col_inc, outpixels += numinputcomponents)
37                                         for (c = 0; c < numoutputcomponents; c++)
38                                                 outpixels[c] = ((index = outputinputcomponentindices[c]) & 0x80000000) ? index : in[index];
39                 }
40         }
41         else
42         {
43                 // special indices not used
44                 if (inputflipdiagonal)
45                 {
46                         for (x = 0, line = inpixels + col_ofs; x < inputwidth; x++, line += col_inc)
47                                 for (y = 0, in = line + row_ofs; y < inputheight; y++, in += row_inc, outpixels += numinputcomponents)
48                                         for (c = 0; c < numoutputcomponents; c++)
49                                                 outpixels[c] = in[outputinputcomponentindices[c]];
50                 }
51                 else
52                 {
53                         for (y = 0, line = inpixels + row_ofs; y < inputheight; y++, line += row_inc)
54                                 for (x = 0, in = line + col_ofs; x < inputwidth; x++, in += col_inc, outpixels += numinputcomponents)
55                                         for (c = 0; c < numoutputcomponents; c++)
56                                                 outpixels[c] = in[outputinputcomponentindices[c]];
57                 }
58         }
59 }
60 #else
61 // intentionally readable version
62 void Image_CopyMux(unsigned char *outpixels, const unsigned char *inpixels, int inputwidth, int inputheight, qboolean inputflipx, qboolean inputflipy, qboolean inputflipdiagonal, int numoutputcomponents, int numinputcomponents, int *outputinputcomponentindices)
63 {
64         int index, c, x, y;
65         const unsigned char *in, *inrow, *incolumn;
66         if (inputflipdiagonal)
67         {
68                 for (x = 0;x < inputwidth;x++)
69                 {
70                         for (y = 0;y < inputheight;y++)
71                         {
72                                 in = inpixels + ((inputflipy ? inputheight - 1 - y : y) * inputwidth + (inputflipx ? inputwidth - 1 - x : x)) * numinputcomponents;
73                                 for (c = 0;c < numoutputcomponents;c++)
74                                 {
75                                         index = outputinputcomponentindices[c];
76                                         if (index & 0x80000000)
77                                                 *outpixels++ = index;
78                                         else
79                                                 *outpixels++ = in[index];
80                                 }
81                         }
82                 }
83         }
84         else
85         {
86                 for (y = 0;y < inputheight;y++)
87                 {
88                         for (x = 0;x < inputwidth;x++)
89                         {
90                                 in = inpixels + ((inputflipy ? inputheight - 1 - y : y) * inputwidth + (inputflipx ? inputwidth - 1 - x : x)) * numinputcomponents;
91                                 for (c = 0;c < numoutputcomponents;c++)
92                                 {
93                                         index = outputinputcomponentindices[c];
94                                         if (index & 0x80000000)
95                                                 *outpixels++ = index;
96                                         else
97                                                 *outpixels++ = in[index];
98                                 }
99                         }
100                 }
101         }
102 }
103 #endif
104
105 void Image_GammaRemapRGB(const unsigned char *in, unsigned char *out, int pixels, const unsigned char *gammar, const unsigned char *gammag, const unsigned char *gammab)
106 {
107         while (pixels--)
108         {
109                 out[0] = gammar[in[0]];
110                 out[1] = gammag[in[1]];
111                 out[2] = gammab[in[2]];
112                 in += 3;
113                 out += 3;
114         }
115 }
116
117 // note: pal must be 32bit color
118 void Image_Copy8bitRGBA(const unsigned char *in, unsigned char *out, int pixels, const unsigned int *pal)
119 {
120         int *iout = (int *)out;
121         while (pixels >= 8)
122         {
123                 iout[0] = pal[in[0]];
124                 iout[1] = pal[in[1]];
125                 iout[2] = pal[in[2]];
126                 iout[3] = pal[in[3]];
127                 iout[4] = pal[in[4]];
128                 iout[5] = pal[in[5]];
129                 iout[6] = pal[in[6]];
130                 iout[7] = pal[in[7]];
131                 in += 8;
132                 iout += 8;
133                 pixels -= 8;
134         }
135         if (pixels & 4)
136         {
137                 iout[0] = pal[in[0]];
138                 iout[1] = pal[in[1]];
139                 iout[2] = pal[in[2]];
140                 iout[3] = pal[in[3]];
141                 in += 4;
142                 iout += 4;
143         }
144         if (pixels & 2)
145         {
146                 iout[0] = pal[in[0]];
147                 iout[1] = pal[in[1]];
148                 in += 2;
149                 iout += 2;
150         }
151         if (pixels & 1)
152                 iout[0] = pal[in[0]];
153 }
154
155 /*
156 =================================================================
157
158   PCX Loading
159
160 =================================================================
161 */
162
163 typedef struct pcx_s
164 {
165     char        manufacturer;
166     char        version;
167     char        encoding;
168     char        bits_per_pixel;
169     unsigned short      xmin,ymin,xmax,ymax;
170     unsigned short      hres,vres;
171     unsigned char       palette[48];
172     char        reserved;
173     char        color_planes;
174     unsigned short      bytes_per_line;
175     unsigned short      palette_type;
176     char        filler[58];
177 } pcx_t;
178
179 /*
180 ============
181 LoadPCX
182 ============
183 */
184 unsigned char* LoadPCX (const unsigned char *f, int filesize, int matchwidth, int matchheight)
185 {
186         pcx_t pcx;
187         unsigned char *a, *b, *image_rgba, *pbuf;
188         const unsigned char *palette, *fin, *enddata;
189         int x, y, x2, dataByte;
190
191         if (filesize < (int)sizeof(pcx) + 768)
192         {
193                 Con_Print("Bad pcx file\n");
194                 return NULL;
195         }
196
197         fin = f;
198
199         memcpy(&pcx, fin, sizeof(pcx));
200         fin += sizeof(pcx);
201
202         // LordHavoc: big-endian support ported from QF newtree
203         pcx.xmax = LittleShort (pcx.xmax);
204         pcx.xmin = LittleShort (pcx.xmin);
205         pcx.ymax = LittleShort (pcx.ymax);
206         pcx.ymin = LittleShort (pcx.ymin);
207         pcx.hres = LittleShort (pcx.hres);
208         pcx.vres = LittleShort (pcx.vres);
209         pcx.bytes_per_line = LittleShort (pcx.bytes_per_line);
210         pcx.palette_type = LittleShort (pcx.palette_type);
211
212         image_width = pcx.xmax + 1 - pcx.xmin;
213         image_height = pcx.ymax + 1 - pcx.ymin;
214         if (pcx.manufacturer != 0x0a || pcx.version != 5 || pcx.encoding != 1 || pcx.bits_per_pixel != 8 || image_width > 4096 || image_height > 4096 || image_width <= 0 || image_height <= 0)
215         {
216                 Con_Print("Bad pcx file\n");
217                 return NULL;
218         }
219         if ((matchwidth && image_width != matchwidth) || (matchheight && image_height != matchheight))
220                 return NULL;
221
222         palette = f + filesize - 768;
223
224         image_rgba = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);
225         if (!image_rgba)
226         {
227                 Con_Printf("LoadPCX: not enough memory for %i by %i image\n", image_width, image_height);
228                 return NULL;
229         }
230         pbuf = image_rgba + image_width*image_height*3;
231         enddata = palette;
232
233         for (y = 0;y < image_height && fin < enddata;y++)
234         {
235                 a = pbuf + y * image_width;
236                 for (x = 0;x < image_width && fin < enddata;)
237                 {
238                         dataByte = *fin++;
239                         if(dataByte >= 0xC0)
240                         {
241                                 if (fin >= enddata)
242                                         break;
243                                 x2 = x + (dataByte & 0x3F);
244                                 dataByte = *fin++;
245                                 if (x2 > image_width)
246                                         x2 = image_width; // technically an error
247                                 while(x < x2)
248                                         a[x++] = dataByte;
249                         }
250                         else
251                                 a[x++] = dataByte;
252                 }
253                 fin += pcx.bytes_per_line - image_width; // the number of bytes per line is always forced to an even number
254                 while(x < image_width)
255                         a[x++] = 0;
256         }
257
258         a = image_rgba;
259         b = pbuf;
260
261         for(x = 0;x < image_width*image_height;x++)
262         {
263                 y = *b++ * 3;
264                 *a++ = palette[y];
265                 *a++ = palette[y+1];
266                 *a++ = palette[y+2];
267                 *a++ = 255;
268         }
269
270         return image_rgba;
271 }
272
273 /*
274 =========================================================
275
276 TARGA LOADING
277
278 =========================================================
279 */
280
281 typedef struct _TargaHeader
282 {
283         unsigned char   id_length, colormap_type, image_type;
284         unsigned short  colormap_index, colormap_length;
285         unsigned char   colormap_size;
286         unsigned short  x_origin, y_origin, width, height;
287         unsigned char   pixel_size, attributes;
288 }
289 TargaHeader;
290
291 void PrintTargaHeader(TargaHeader *t)
292 {
293         Con_Printf("TargaHeader:\nuint8 id_length = %i;\nuint8 colormap_type = %i;\nuint8 image_type = %i;\nuint16 colormap_index = %i;\nuint16 colormap_length = %i;\nuint8 colormap_size = %i;\nuint16 x_origin = %i;\nuint16 y_origin = %i;\nuint16 width = %i;\nuint16 height = %i;\nuint8 pixel_size = %i;\nuint8 attributes = %i;\n", t->id_length, t->colormap_type, t->image_type, t->colormap_index, t->colormap_length, t->colormap_size, t->x_origin, t->y_origin, t->width, t->height, t->pixel_size, t->attributes);
294 }
295
296 /*
297 =============
298 LoadTGA
299 =============
300 */
301 unsigned char *LoadTGA (const unsigned char *f, int filesize, int matchwidth, int matchheight)
302 {
303         int x, y, pix_inc, row_inc, red, green, blue, alpha, runlen, alphabits;
304         unsigned char *pixbuf, *image_rgba;
305         const unsigned char *fin, *enddata;
306         unsigned char *p;
307         TargaHeader targa_header;
308         unsigned char palette[256*4];
309
310         if (filesize < 19)
311                 return NULL;
312
313         enddata = f + filesize;
314
315         targa_header.id_length = f[0];
316         targa_header.colormap_type = f[1];
317         targa_header.image_type = f[2];
318
319         targa_header.colormap_index = f[3] + f[4] * 256;
320         targa_header.colormap_length = f[5] + f[6] * 256;
321         targa_header.colormap_size = f[7];
322         targa_header.x_origin = f[8] + f[9] * 256;
323         targa_header.y_origin = f[10] + f[11] * 256;
324         targa_header.width = image_width = f[12] + f[13] * 256;
325         targa_header.height = image_height = f[14] + f[15] * 256;
326         if (image_width > 4096 || image_height > 4096 || image_width <= 0 || image_height <= 0)
327         {
328                 Con_Print("LoadTGA: invalid size\n");
329                 PrintTargaHeader(&targa_header);
330                 return NULL;
331         }
332         if ((matchwidth && image_width != matchwidth) || (matchheight && image_height != matchheight))
333                 return NULL;
334         targa_header.pixel_size = f[16];
335         targa_header.attributes = f[17];
336
337         // advance to end of header
338         fin = f + 18;
339
340         // skip TARGA image comment (usually 0 bytes)
341         fin += targa_header.id_length;
342
343         // read/skip the colormap if present (note: according to the TARGA spec it
344         // can be present even on truecolor or greyscale images, just not used by
345         // the image data)
346         if (targa_header.colormap_type)
347         {
348                 if (targa_header.colormap_length > 256)
349                 {
350                         Con_Print("LoadTGA: only up to 256 colormap_length supported\n");
351                         PrintTargaHeader(&targa_header);
352                         return NULL;
353                 }
354                 if (targa_header.colormap_index)
355                 {
356                         Con_Print("LoadTGA: colormap_index not supported\n");
357                         PrintTargaHeader(&targa_header);
358                         return NULL;
359                 }
360                 if (targa_header.colormap_size == 24)
361                 {
362                         for (x = 0;x < targa_header.colormap_length;x++)
363                         {
364                                 palette[x*4+2] = *fin++;
365                                 palette[x*4+1] = *fin++;
366                                 palette[x*4+0] = *fin++;
367                                 palette[x*4+3] = 255;
368                         }
369                 }
370                 else if (targa_header.colormap_size == 32)
371                 {
372                         for (x = 0;x < targa_header.colormap_length;x++)
373                         {
374                                 palette[x*4+2] = *fin++;
375                                 palette[x*4+1] = *fin++;
376                                 palette[x*4+0] = *fin++;
377                                 palette[x*4+3] = *fin++;
378                         }
379                 }
380                 else
381                 {
382                         Con_Print("LoadTGA: Only 32 and 24 bit colormap_size supported\n");
383                         PrintTargaHeader(&targa_header);
384                         return NULL;
385                 }
386         }
387
388         // check our pixel_size restrictions according to image_type
389         switch (targa_header.image_type & ~8)
390         {
391         case 2:
392                 if (targa_header.pixel_size != 24 && targa_header.pixel_size != 32)
393                 {
394                         Con_Print("LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n");
395                         PrintTargaHeader(&targa_header);
396                         return NULL;
397                 }
398                 break;
399         case 3:
400                 // set up a palette to make the loader easier
401                 for (x = 0;x < 256;x++)
402                 {
403                         palette[x*4+2] = x;
404                         palette[x*4+1] = x;
405                         palette[x*4+0] = x;
406                         palette[x*4+3] = 255;
407                 }
408                 // fall through to colormap case
409         case 1:
410                 if (targa_header.pixel_size != 8)
411                 {
412                         Con_Print("LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n");
413                         PrintTargaHeader(&targa_header);
414                         return NULL;
415                 }
416                 break;
417         default:
418                 Con_Printf("LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported, image_type = %i\n", targa_header.image_type);
419                 PrintTargaHeader(&targa_header);
420                 return NULL;
421         }
422
423         if (targa_header.attributes & 0x10)
424         {
425                 Con_Print("LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n");
426                 return NULL;
427         }
428
429         // number of attribute bits per pixel, we only support 0 or 8
430         alphabits = targa_header.attributes & 0x0F;
431         if (alphabits != 8 && alphabits != 0)
432         {
433                 Con_Print("LoadTGA: only 0 or 8 attribute (alpha) bits supported\n");
434                 return NULL;
435         }
436
437         image_rgba = (unsigned char *)Mem_Alloc(tempmempool, image_width * image_height * 4);
438         if (!image_rgba)
439         {
440                 Con_Printf("LoadTGA: not enough memory for %i by %i image\n", image_width, image_height);
441                 return NULL;
442         }
443
444         // If bit 5 of attributes isn't set, the image has been stored from bottom to top
445         if ((targa_header.attributes & 0x20) == 0)
446         {
447                 pixbuf = image_rgba + (image_height - 1)*image_width*4;
448                 row_inc = -image_width*4*2;
449         }
450         else
451         {
452                 pixbuf = image_rgba;
453                 row_inc = 0;
454         }
455
456         x = 0;
457         y = 0;
458         red = green = blue = alpha = 255;
459         pix_inc = 1;
460         if ((targa_header.image_type & ~8) == 2)
461                 pix_inc = targa_header.pixel_size / 8;
462         switch (targa_header.image_type)
463         {
464         case 1: // colormapped, uncompressed
465         case 3: // greyscale, uncompressed
466                 if (fin + image_width * image_height * pix_inc > enddata)
467                         break;
468                 for (y = 0;y < image_height;y++, pixbuf += row_inc)
469                 {
470                         for (x = 0;x < image_width;x++)
471                         {
472                                 p = palette + *fin++ * 4;
473                                 *pixbuf++ = p[0];
474                                 *pixbuf++ = p[1];
475                                 *pixbuf++ = p[2];
476                                 *pixbuf++ = p[3];
477                         }
478                 }
479                 break;
480         case 2:
481                 // BGR or BGRA, uncompressed
482                 if (fin + image_width * image_height * pix_inc > enddata)
483                         break;
484                 if (targa_header.pixel_size == 32 && alphabits)
485                 {
486                         for (y = 0;y < image_height;y++, pixbuf += row_inc)
487                         {
488                                 for (x = 0;x < image_width;x++, fin += pix_inc)
489                                 {
490                                         *pixbuf++ = fin[2];
491                                         *pixbuf++ = fin[1];
492                                         *pixbuf++ = fin[0];
493                                         *pixbuf++ = fin[3];
494                                 }
495                         }
496                 }
497                 else
498                 {
499                         for (y = 0;y < image_height;y++, pixbuf += row_inc)
500                         {
501                                 for (x = 0;x < image_width;x++, fin += pix_inc)
502                                 {
503                                         *pixbuf++ = fin[2];
504                                         *pixbuf++ = fin[1];
505                                         *pixbuf++ = fin[0];
506                                         *pixbuf++ = 255;
507                                 }
508                         }
509                 }
510                 break;
511         case 9: // colormapped, RLE
512         case 11: // greyscale, RLE
513                 for (y = 0;y < image_height;y++, pixbuf += row_inc)
514                 {
515                         for (x = 0;x < image_width;)
516                         {
517                                 if (fin >= enddata)
518                                         break; // error - truncated file
519                                 runlen = *fin++;
520                                 if (runlen & 0x80)
521                                 {
522                                         // RLE - all pixels the same color
523                                         runlen += 1 - 0x80;
524                                         if (fin + pix_inc > enddata)
525                                                 break; // error - truncated file
526                                         if (x + runlen > image_width)
527                                                 break; // error - line exceeds width
528                                         p = palette + *fin++ * 4;
529                                         red = p[0];
530                                         green = p[1];
531                                         blue = p[2];
532                                         alpha = p[3];
533                                         for (;runlen--;x++)
534                                         {
535                                                 *pixbuf++ = red;
536                                                 *pixbuf++ = green;
537                                                 *pixbuf++ = blue;
538                                                 *pixbuf++ = alpha;
539                                         }
540                                 }
541                                 else
542                                 {
543                                         // uncompressed - all pixels different color
544                                         runlen++;
545                                         if (fin + pix_inc * runlen > enddata)
546                                                 break; // error - truncated file
547                                         if (x + runlen > image_width)
548                                                 break; // error - line exceeds width
549                                         for (;runlen--;x++)
550                                         {
551                                                 p = palette + *fin++ * 4;
552                                                 *pixbuf++ = p[0];
553                                                 *pixbuf++ = p[1];
554                                                 *pixbuf++ = p[2];
555                                                 *pixbuf++ = p[3];
556                                         }
557                                 }
558                         }
559                 }
560                 break;
561         case 10:
562                 // BGR or BGRA, RLE
563                 if (targa_header.pixel_size == 32 && alphabits)
564                 {
565                         for (y = 0;y < image_height;y++, pixbuf += row_inc)
566                         {
567                                 for (x = 0;x < image_width;)
568                                 {
569                                         if (fin >= enddata)
570                                                 break; // error - truncated file
571                                         runlen = *fin++;
572                                         if (runlen & 0x80)
573                                         {
574                                                 // RLE - all pixels the same color
575                                                 runlen += 1 - 0x80;
576                                                 if (fin + pix_inc > enddata)
577                                                         break; // error - truncated file
578                                                 if (x + runlen > image_width)
579                                                         break; // error - line exceeds width
580                                                 red = fin[2];
581                                                 green = fin[1];
582                                                 blue = fin[0];
583                                                 alpha = fin[3];
584                                                 fin += pix_inc;
585                                                 for (;runlen--;x++)
586                                                 {
587                                                         *pixbuf++ = red;
588                                                         *pixbuf++ = green;
589                                                         *pixbuf++ = blue;
590                                                         *pixbuf++ = alpha;
591                                                 }
592                                         }
593                                         else
594                                         {
595                                                 // uncompressed - all pixels different color
596                                                 runlen++;
597                                                 if (fin + pix_inc * runlen > enddata)
598                                                         break; // error - truncated file
599                                                 if (x + runlen > image_width)
600                                                         break; // error - line exceeds width
601                                                 for (;runlen--;x++, fin += pix_inc)
602                                                 {
603                                                         *pixbuf++ = fin[2];
604                                                         *pixbuf++ = fin[1];
605                                                         *pixbuf++ = fin[0];
606                                                         *pixbuf++ = fin[3];
607                                                 }
608                                         }
609                                 }
610                         }
611                 }
612                 else
613                 {
614                         for (y = 0;y < image_height;y++, pixbuf += row_inc)
615                         {
616                                 for (x = 0;x < image_width;)
617                                 {
618                                         if (fin >= enddata)
619                                                 break; // error - truncated file
620                                         runlen = *fin++;
621                                         if (runlen & 0x80)
622                                         {
623                                                 // RLE - all pixels the same color
624                                                 runlen += 1 - 0x80;
625                                                 if (fin + pix_inc > enddata)
626                                                         break; // error - truncated file
627                                                 if (x + runlen > image_width)
628                                                         break; // error - line exceeds width
629                                                 red = fin[2];
630                                                 green = fin[1];
631                                                 blue = fin[0];
632                                                 alpha = 255;
633                                                 fin += pix_inc;
634                                                 for (;runlen--;x++)
635                                                 {
636                                                         *pixbuf++ = red;
637                                                         *pixbuf++ = green;
638                                                         *pixbuf++ = blue;
639                                                         *pixbuf++ = alpha;
640                                                 }
641                                         }
642                                         else
643                                         {
644                                                 // uncompressed - all pixels different color
645                                                 runlen++;
646                                                 if (fin + pix_inc * runlen > enddata)
647                                                         break; // error - truncated file
648                                                 if (x + runlen > image_width)
649                                                         break; // error - line exceeds width
650                                                 for (;runlen--;x++, fin += pix_inc)
651                                                 {
652                                                         *pixbuf++ = fin[2];
653                                                         *pixbuf++ = fin[1];
654                                                         *pixbuf++ = fin[0];
655                                                         *pixbuf++ = 255;
656                                                 }
657                                         }
658                                 }
659                         }
660                 }
661                 break;
662         default:
663                 // unknown image_type
664                 break;
665         }
666
667         return image_rgba;
668 }
669
670 /*
671 ============
672 LoadLMP
673 ============
674 */
675 unsigned char *LoadLMP (const unsigned char *f, int filesize, int matchwidth, int matchheight, qboolean loadAs8Bit)
676 {
677         unsigned char *image_buffer;
678
679         if (filesize < 9)
680         {
681                 Con_Print("LoadLMP: invalid LMP file\n");
682                 return NULL;
683         }
684
685         // parse the very complicated header *chuckle*
686         image_width = BuffLittleLong(f);
687         image_height = BuffLittleLong(f + 4);
688         if (image_width > 4096 || image_height > 4096 || image_width <= 0 || image_height <= 0)
689         {
690                 Con_Printf("LoadLMP: invalid size %ix%i\n", image_width, image_height);
691                 return NULL;
692         }
693         if ((matchwidth && image_width != matchwidth) || (matchheight && image_height != matchheight))
694                 return NULL;
695
696         if (filesize < (8 + image_width * image_height))
697         {
698                 Con_Print("LoadLMP: invalid LMP file\n");
699                 return NULL;
700         }
701
702         if (loadAs8Bit)
703         {
704                 image_buffer = (unsigned char *)Mem_Alloc(tempmempool, image_width * image_height);
705                 memcpy(image_buffer, f + 8, image_width * image_height);
706         }
707         else
708         {
709                 image_buffer = (unsigned char *)Mem_Alloc(tempmempool, image_width * image_height * 4);
710                 Image_Copy8bitRGBA(f + 8, image_buffer, image_width * image_height, palette_transparent);
711         }
712         return image_buffer;
713 }
714
715
716 typedef struct q2wal_s
717 {
718         char            name[32];
719         unsigned        width, height;
720         unsigned        offsets[MIPLEVELS];             // four mip maps stored
721         char            animname[32];                   // next frame in animation chain
722         int                     flags;
723         int                     contents;
724         int                     value;
725 } q2wal_t;
726
727 unsigned char *LoadWAL (const unsigned char *f, int filesize, int matchwidth, int matchheight)
728 {
729         unsigned char *image_rgba;
730         const q2wal_t *inwal = (const q2wal_t *)f;
731
732         if (filesize < (int) sizeof(q2wal_t))
733         {
734                 Con_Print("LoadWAL: invalid WAL file\n");
735                 return NULL;
736         }
737
738         image_width = LittleLong(inwal->width);
739         image_height = LittleLong(inwal->height);
740         if (image_width > 4096 || image_height > 4096 || image_width <= 0 || image_height <= 0)
741         {
742                 Con_Printf("LoadWAL: invalid size %ix%i\n", image_width, image_height);
743                 return NULL;
744         }
745         if ((matchwidth && image_width != matchwidth) || (matchheight && image_height != matchheight))
746                 return NULL;
747
748         if (filesize < (int) sizeof(q2wal_t) + (int) LittleLong(inwal->offsets[0]) + image_width * image_height)
749         {
750                 Con_Print("LoadWAL: invalid WAL file\n");
751                 return NULL;
752         }
753
754         image_rgba = (unsigned char *)Mem_Alloc(tempmempool, image_width * image_height * 4);
755         if (!image_rgba)
756         {
757                 Con_Printf("LoadLMP: not enough memory for %i by %i image\n", image_width, image_height);
758                 return NULL;
759         }
760         Image_Copy8bitRGBA(f + LittleLong(inwal->offsets[0]), image_rgba, image_width * image_height, palette_complete);
761         return image_rgba;
762 }
763
764
765 static void Image_StripImageExtension (const char *in, char *out, size_t size_out)
766 {
767         const char *end, *temp;
768
769         if (size_out == 0)
770                 return;
771
772         end = in + strlen(in);
773         if ((end - in) >= 4)
774         {
775                 temp = end - 4;
776                 if (strcmp(temp, ".tga") == 0
777                  || strcmp(temp, ".pcx") == 0
778                  || strcmp(temp, ".lmp") == 0
779                  || strcmp(temp, ".png") == 0
780                  || strcmp(temp, ".jpg") == 0)
781                         end = temp;
782                 while (in < end && size_out > 1)
783                 {
784                         *out++ = *in++;
785                         size_out--;
786                 }
787                 *out++ = 0;
788         }
789         else
790                 strlcpy(out, in, size_out);
791 }
792
793 typedef struct imageformat_s
794 {
795         const char *formatstring;
796         unsigned char *(*loadfunc)(const unsigned char *f, int filesize, int matchwidth, int matchheight);
797 }
798 imageformat_t;
799
800 // GAME_TENEBRAE only
801 imageformat_t imageformats_tenebrae[] =
802 {
803         {"override/%s.tga", LoadTGA},
804         {"override/%s.png", PNG_LoadImage},
805         {"override/%s.jpg", JPEG_LoadImage},
806         {"override/%s.pcx", LoadPCX},
807         {NULL, NULL}
808 };
809
810 imageformat_t imageformats_nopath[] =
811 {
812         {"override/%s.tga", LoadTGA},
813         {"override/%s.png", PNG_LoadImage},
814         {"override/%s.jpg", JPEG_LoadImage},
815         {"textures/%s.tga", LoadTGA},
816         {"textures/%s.png", PNG_LoadImage},
817         {"textures/%s.jpg", JPEG_LoadImage},
818         {"%s.tga", LoadTGA},
819         {"%s.png", PNG_LoadImage},
820         {"%s.jpg", JPEG_LoadImage},
821         {"%s.pcx", LoadPCX},
822         {NULL, NULL}
823 };
824
825 imageformat_t imageformats_textures[] =
826 {
827         {"%s.tga", LoadTGA},
828         {"%s.png", PNG_LoadImage},
829         {"%s.jpg", JPEG_LoadImage},
830         {"%s.pcx", LoadPCX},
831         {"%s.wal", LoadWAL},
832         {NULL, NULL}
833 };
834
835 imageformat_t imageformats_gfx[] =
836 {
837         {"%s.tga", LoadTGA},
838         {"%s.png", PNG_LoadImage},
839         {"%s.jpg", JPEG_LoadImage},
840         {"%s.pcx", LoadPCX},
841         {NULL, NULL}
842 };
843
844 imageformat_t imageformats_other[] =
845 {
846         {"%s.tga", LoadTGA},
847         {"%s.png", PNG_LoadImage},
848         {"%s.jpg", JPEG_LoadImage},
849         {"%s.pcx", LoadPCX},
850         {NULL, NULL}
851 };
852
853 unsigned char *loadimagepixels (const char *filename, qboolean complain, int matchwidth, int matchheight)
854 {
855         fs_offset_t filesize;
856         imageformat_t *firstformat, *format;
857         unsigned char *f, *data = NULL;
858         char basename[MAX_QPATH], name[MAX_QPATH], *c;
859         if (developer_memorydebug.integer)
860                 Mem_CheckSentinelsGlobal();
861         if (developer_texturelogging.integer)
862                 Log_Printf("textures.log", "%s\n", filename);
863         Image_StripImageExtension(filename, basename, sizeof(basename)); // strip filename extensions to allow replacement by other types
864         // replace *'s with #, so commandline utils don't get confused when dealing with the external files
865         for (c = basename;*c;c++)
866                 if (*c == '*')
867                         *c = '#';
868         name[0] = 0;
869         if (strchr(basename, '/'))
870         {
871                 int i;
872                 for (i = 0;i < (int)sizeof(name)-1 && basename[i] != '/';i++)
873                         name[i] = basename[i];
874                 name[i] = 0;
875         }
876         if (gamemode == GAME_TENEBRAE)
877                 firstformat = imageformats_tenebrae;
878         else if (!strcasecmp(name, "textures"))
879                 firstformat = imageformats_textures;
880         else if (!strcasecmp(name, "gfx"))
881                 firstformat = imageformats_gfx;
882         else if (!strchr(name, '/'))
883                 firstformat = imageformats_nopath;
884         else
885                 firstformat = imageformats_other;
886         // now try all the formats in the selected list
887         for (format = firstformat;format->formatstring;format++)
888         {
889                 sprintf (name, format->formatstring, basename);
890                 f = FS_LoadFile(name, tempmempool, true, &filesize);
891                 if (f)
892                 {
893                         data = format->loadfunc(f, filesize, matchwidth, matchheight);
894                         Mem_Free(f);
895                         if (data)
896                         {
897                                 if (developer.integer >= 10)
898                                         Con_Printf("loaded image %s (%dx%d)\n", name, image_width, image_height);
899                                 if (developer_memorydebug.integer)
900                                         Mem_CheckSentinelsGlobal();
901                                 return data;
902                         }
903                         else
904                         {
905                                 if (developer.integer >= 1)
906                                         Con_Printf("Error loading image %s (file loaded but decode failed)\n", name);
907                         }
908                 }
909         }
910         if (complain)
911         {
912                 Con_Printf("Couldn't load %s using ", filename);
913                 for (format = firstformat;format->formatstring;format++)
914                 {
915                         sprintf (name, format->formatstring, basename);
916                         Con_Printf(format == firstformat ? "\"%s\"" : (format[1].formatstring ? ", \"%s\"" : " or \"%s\".\n"), format->formatstring);
917                 }
918         }
919         if (developer_memorydebug.integer)
920                 Mem_CheckSentinelsGlobal();
921         return NULL;
922 }
923
924 rtexture_t *loadtextureimage (rtexturepool_t *pool, const char *filename, int matchwidth, int matchheight, qboolean complain, int flags)
925 {
926         unsigned char *data;
927         rtexture_t *rt;
928         if (!(data = loadimagepixels (filename, complain, matchwidth, matchheight)))
929                 return 0;
930         rt = R_LoadTexture2D(pool, filename, image_width, image_height, data, TEXTYPE_RGBA, flags, NULL);
931         Mem_Free(data);
932         return rt;
933 }
934
935 qboolean Image_WriteTGARGB_preflipped (const char *filename, int width, int height, const unsigned char *data, unsigned char *buffer)
936 {
937         qboolean ret;
938         unsigned char *out;
939         const unsigned char *in, *end;
940
941         memset (buffer, 0, 18);
942         buffer[2] = 2;          // uncompressed type
943         buffer[12] = (width >> 0) & 0xFF;
944         buffer[13] = (width >> 8) & 0xFF;
945         buffer[14] = (height >> 0) & 0xFF;
946         buffer[15] = (height >> 8) & 0xFF;
947         buffer[16] = 24;        // pixel size
948
949         // swap rgb to bgr
950         in = data;
951         out = buffer + 18;
952         end = in + width*height*3;
953         for (;in < end;in += 3)
954         {
955                 *out++ = in[2];
956                 *out++ = in[1];
957                 *out++ = in[0];
958         }
959         ret = FS_WriteFile (filename, buffer, width*height*3 + 18 );
960
961         return ret;
962 }
963
964 void Image_WriteTGARGBA (const char *filename, int width, int height, const unsigned char *data)
965 {
966         int y;
967         unsigned char *buffer, *out;
968         const unsigned char *in, *end;
969
970         buffer = (unsigned char *)Mem_Alloc(tempmempool, width*height*4 + 18);
971
972         memset (buffer, 0, 18);
973         buffer[2] = 2;          // uncompressed type
974         buffer[12] = (width >> 0) & 0xFF;
975         buffer[13] = (width >> 8) & 0xFF;
976         buffer[14] = (height >> 0) & 0xFF;
977         buffer[15] = (height >> 8) & 0xFF;
978         buffer[16] = 32;        // pixel size
979         buffer[17] = 8; // 8 bits of alpha
980
981         // swap rgba to bgra and flip upside down
982         out = buffer + 18;
983         for (y = height - 1;y >= 0;y--)
984         {
985                 in = data + y * width * 4;
986                 end = in + width * 4;
987                 for (;in < end;in += 4)
988                 {
989                         *out++ = in[2];
990                         *out++ = in[1];
991                         *out++ = in[0];
992                         *out++ = in[3];
993                 }
994         }
995         FS_WriteFile (filename, buffer, width*height*4 + 18 );
996
997         Mem_Free(buffer);
998 }
999
1000 static void Image_Resample32LerpLine (const unsigned char *in, unsigned char *out, int inwidth, int outwidth)
1001 {
1002         int             j, xi, oldx = 0, f, fstep, endx, lerp;
1003         fstep = (int) (inwidth*65536.0f/outwidth);
1004         endx = (inwidth-1);
1005         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
1006         {
1007                 xi = f >> 16;
1008                 if (xi != oldx)
1009                 {
1010                         in += (xi - oldx) * 4;
1011                         oldx = xi;
1012                 }
1013                 if (xi < endx)
1014                 {
1015                         lerp = f & 0xFFFF;
1016                         *out++ = (unsigned char) ((((in[4] - in[0]) * lerp) >> 16) + in[0]);
1017                         *out++ = (unsigned char) ((((in[5] - in[1]) * lerp) >> 16) + in[1]);
1018                         *out++ = (unsigned char) ((((in[6] - in[2]) * lerp) >> 16) + in[2]);
1019                         *out++ = (unsigned char) ((((in[7] - in[3]) * lerp) >> 16) + in[3]);
1020                 }
1021                 else // last pixel of the line has no pixel to lerp to
1022                 {
1023                         *out++ = in[0];
1024                         *out++ = in[1];
1025                         *out++ = in[2];
1026                         *out++ = in[3];
1027                 }
1028         }
1029 }
1030
1031 static void Image_Resample24LerpLine (const unsigned char *in, unsigned char *out, int inwidth, int outwidth)
1032 {
1033         int             j, xi, oldx = 0, f, fstep, endx, lerp;
1034         fstep = (int) (inwidth*65536.0f/outwidth);
1035         endx = (inwidth-1);
1036         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
1037         {
1038                 xi = f >> 16;
1039                 if (xi != oldx)
1040                 {
1041                         in += (xi - oldx) * 3;
1042                         oldx = xi;
1043                 }
1044                 if (xi < endx)
1045                 {
1046                         lerp = f & 0xFFFF;
1047                         *out++ = (unsigned char) ((((in[3] - in[0]) * lerp) >> 16) + in[0]);
1048                         *out++ = (unsigned char) ((((in[4] - in[1]) * lerp) >> 16) + in[1]);
1049                         *out++ = (unsigned char) ((((in[5] - in[2]) * lerp) >> 16) + in[2]);
1050                 }
1051                 else // last pixel of the line has no pixel to lerp to
1052                 {
1053                         *out++ = in[0];
1054                         *out++ = in[1];
1055                         *out++ = in[2];
1056                 }
1057         }
1058 }
1059
1060 #define LERPBYTE(i) r = resamplerow1[i];out[i] = (unsigned char) ((((resamplerow2[i] - r) * lerp) >> 16) + r)
1061 void Image_Resample32Lerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1062 {
1063         int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth4 = inwidth*4, outwidth4 = outwidth*4;
1064         unsigned char *out;
1065         const unsigned char *inrow;
1066         unsigned char *resamplerow1;
1067         unsigned char *resamplerow2;
1068         out = (unsigned char *)outdata;
1069         fstep = (int) (inheight*65536.0f/outheight);
1070
1071         resamplerow1 = (unsigned char *)Mem_Alloc(tempmempool, outwidth*4*2);
1072         resamplerow2 = resamplerow1 + outwidth*4;
1073
1074         inrow = (const unsigned char *)indata;
1075         oldy = 0;
1076         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
1077         Image_Resample32LerpLine (inrow + inwidth4, resamplerow2, inwidth, outwidth);
1078         for (i = 0, f = 0;i < outheight;i++,f += fstep)
1079         {
1080                 yi = f >> 16;
1081                 if (yi < endy)
1082                 {
1083                         lerp = f & 0xFFFF;
1084                         if (yi != oldy)
1085                         {
1086                                 inrow = (unsigned char *)indata + inwidth4*yi;
1087                                 if (yi == oldy+1)
1088                                         memcpy(resamplerow1, resamplerow2, outwidth4);
1089                                 else
1090                                         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
1091                                 Image_Resample32LerpLine (inrow + inwidth4, resamplerow2, inwidth, outwidth);
1092                                 oldy = yi;
1093                         }
1094                         j = outwidth - 4;
1095                         while(j >= 0)
1096                         {
1097                                 LERPBYTE( 0);
1098                                 LERPBYTE( 1);
1099                                 LERPBYTE( 2);
1100                                 LERPBYTE( 3);
1101                                 LERPBYTE( 4);
1102                                 LERPBYTE( 5);
1103                                 LERPBYTE( 6);
1104                                 LERPBYTE( 7);
1105                                 LERPBYTE( 8);
1106                                 LERPBYTE( 9);
1107                                 LERPBYTE(10);
1108                                 LERPBYTE(11);
1109                                 LERPBYTE(12);
1110                                 LERPBYTE(13);
1111                                 LERPBYTE(14);
1112                                 LERPBYTE(15);
1113                                 out += 16;
1114                                 resamplerow1 += 16;
1115                                 resamplerow2 += 16;
1116                                 j -= 4;
1117                         }
1118                         if (j & 2)
1119                         {
1120                                 LERPBYTE( 0);
1121                                 LERPBYTE( 1);
1122                                 LERPBYTE( 2);
1123                                 LERPBYTE( 3);
1124                                 LERPBYTE( 4);
1125                                 LERPBYTE( 5);
1126                                 LERPBYTE( 6);
1127                                 LERPBYTE( 7);
1128                                 out += 8;
1129                                 resamplerow1 += 8;
1130                                 resamplerow2 += 8;
1131                         }
1132                         if (j & 1)
1133                         {
1134                                 LERPBYTE( 0);
1135                                 LERPBYTE( 1);
1136                                 LERPBYTE( 2);
1137                                 LERPBYTE( 3);
1138                                 out += 4;
1139                                 resamplerow1 += 4;
1140                                 resamplerow2 += 4;
1141                         }
1142                         resamplerow1 -= outwidth4;
1143                         resamplerow2 -= outwidth4;
1144                 }
1145                 else
1146                 {
1147                         if (yi != oldy)
1148                         {
1149                                 inrow = (unsigned char *)indata + inwidth4*yi;
1150                                 if (yi == oldy+1)
1151                                         memcpy(resamplerow1, resamplerow2, outwidth4);
1152                                 else
1153                                         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
1154                                 oldy = yi;
1155                         }
1156                         memcpy(out, resamplerow1, outwidth4);
1157                 }
1158         }
1159
1160         Mem_Free(resamplerow1);
1161         resamplerow1 = NULL;
1162         resamplerow2 = NULL;
1163 }
1164
1165 void Image_Resample32Nolerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1166 {
1167         int i, j;
1168         unsigned frac, fracstep;
1169         // relies on int being 4 bytes
1170         int *inrow, *out;
1171         out = (int *)outdata;
1172
1173         fracstep = inwidth*0x10000/outwidth;
1174         for (i = 0;i < outheight;i++)
1175         {
1176                 inrow = (int *)indata + inwidth*(i*inheight/outheight);
1177                 frac = fracstep >> 1;
1178                 j = outwidth - 4;
1179                 while (j >= 0)
1180                 {
1181                         out[0] = inrow[frac >> 16];frac += fracstep;
1182                         out[1] = inrow[frac >> 16];frac += fracstep;
1183                         out[2] = inrow[frac >> 16];frac += fracstep;
1184                         out[3] = inrow[frac >> 16];frac += fracstep;
1185                         out += 4;
1186                         j -= 4;
1187                 }
1188                 if (j & 2)
1189                 {
1190                         out[0] = inrow[frac >> 16];frac += fracstep;
1191                         out[1] = inrow[frac >> 16];frac += fracstep;
1192                         out += 2;
1193                 }
1194                 if (j & 1)
1195                 {
1196                         out[0] = inrow[frac >> 16];frac += fracstep;
1197                         out += 1;
1198                 }
1199         }
1200 }
1201
1202 void Image_Resample24Lerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1203 {
1204         int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth3 = inwidth * 3, outwidth3 = outwidth * 3;
1205         unsigned char *out;
1206         const unsigned char *inrow;
1207         unsigned char *resamplerow1;
1208         unsigned char *resamplerow2;
1209         out = (unsigned char *)outdata;
1210         fstep = (int) (inheight*65536.0f/outheight);
1211
1212         resamplerow1 = (unsigned char *)Mem_Alloc(tempmempool, outwidth*3*2);
1213         resamplerow2 = resamplerow1 + outwidth*3;
1214
1215         inrow = (const unsigned char *)indata;
1216         oldy = 0;
1217         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1218         Image_Resample24LerpLine (inrow + inwidth3, resamplerow2, inwidth, outwidth);
1219         for (i = 0, f = 0;i < outheight;i++,f += fstep)
1220         {
1221                 yi = f >> 16;
1222                 if (yi < endy)
1223                 {
1224                         lerp = f & 0xFFFF;
1225                         if (yi != oldy)
1226                         {
1227                                 inrow = (unsigned char *)indata + inwidth3*yi;
1228                                 if (yi == oldy+1)
1229                                         memcpy(resamplerow1, resamplerow2, outwidth3);
1230                                 else
1231                                         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1232                                 Image_Resample24LerpLine (inrow + inwidth3, resamplerow2, inwidth, outwidth);
1233                                 oldy = yi;
1234                         }
1235                         j = outwidth - 4;
1236                         while(j >= 0)
1237                         {
1238                                 LERPBYTE( 0);
1239                                 LERPBYTE( 1);
1240                                 LERPBYTE( 2);
1241                                 LERPBYTE( 3);
1242                                 LERPBYTE( 4);
1243                                 LERPBYTE( 5);
1244                                 LERPBYTE( 6);
1245                                 LERPBYTE( 7);
1246                                 LERPBYTE( 8);
1247                                 LERPBYTE( 9);
1248                                 LERPBYTE(10);
1249                                 LERPBYTE(11);
1250                                 out += 12;
1251                                 resamplerow1 += 12;
1252                                 resamplerow2 += 12;
1253                                 j -= 4;
1254                         }
1255                         if (j & 2)
1256                         {
1257                                 LERPBYTE( 0);
1258                                 LERPBYTE( 1);
1259                                 LERPBYTE( 2);
1260                                 LERPBYTE( 3);
1261                                 LERPBYTE( 4);
1262                                 LERPBYTE( 5);
1263                                 out += 6;
1264                                 resamplerow1 += 6;
1265                                 resamplerow2 += 6;
1266                         }
1267                         if (j & 1)
1268                         {
1269                                 LERPBYTE( 0);
1270                                 LERPBYTE( 1);
1271                                 LERPBYTE( 2);
1272                                 out += 3;
1273                                 resamplerow1 += 3;
1274                                 resamplerow2 += 3;
1275                         }
1276                         resamplerow1 -= outwidth3;
1277                         resamplerow2 -= outwidth3;
1278                 }
1279                 else
1280                 {
1281                         if (yi != oldy)
1282                         {
1283                                 inrow = (unsigned char *)indata + inwidth3*yi;
1284                                 if (yi == oldy+1)
1285                                         memcpy(resamplerow1, resamplerow2, outwidth3);
1286                                 else
1287                                         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1288                                 oldy = yi;
1289                         }
1290                         memcpy(out, resamplerow1, outwidth3);
1291                 }
1292         }
1293         Mem_Free(resamplerow1);
1294         resamplerow1 = NULL;
1295         resamplerow2 = NULL;
1296 }
1297
1298 void Image_Resample24Nolerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1299 {
1300         int i, j, f, inwidth3 = inwidth * 3;
1301         unsigned frac, fracstep;
1302         unsigned char *inrow, *out;
1303         out = (unsigned char *)outdata;
1304
1305         fracstep = inwidth*0x10000/outwidth;
1306         for (i = 0;i < outheight;i++)
1307         {
1308                 inrow = (unsigned char *)indata + inwidth3*(i*inheight/outheight);
1309                 frac = fracstep >> 1;
1310                 j = outwidth - 4;
1311                 while (j >= 0)
1312                 {
1313                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1314                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1315                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1316                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1317                         j -= 4;
1318                 }
1319                 if (j & 2)
1320                 {
1321                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1322                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1323                         out += 2;
1324                 }
1325                 if (j & 1)
1326                 {
1327                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1328                         out += 1;
1329                 }
1330         }
1331 }
1332
1333 /*
1334 ================
1335 Image_Resample
1336 ================
1337 */
1338 void Image_Resample (const void *indata, int inwidth, int inheight, int indepth, void *outdata, int outwidth, int outheight, int outdepth, int bytesperpixel, int quality)
1339 {
1340         if (indepth != 1 || outdepth != 1)
1341         {
1342                 Con_Printf ("Image_Resample: 3D resampling not supported\n");
1343                 return;
1344         }
1345         if (bytesperpixel == 4)
1346         {
1347                 if (quality)
1348                         Image_Resample32Lerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1349                 else
1350                         Image_Resample32Nolerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1351         }
1352         else if (bytesperpixel == 3)
1353         {
1354                 if (quality)
1355                         Image_Resample24Lerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1356                 else
1357                         Image_Resample24Nolerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1358         }
1359         else
1360                 Con_Printf ("Image_Resample: unsupported bytesperpixel %i\n", bytesperpixel);
1361 }
1362
1363 // in can be the same as out
1364 void Image_MipReduce(const unsigned char *in, unsigned char *out, int *width, int *height, int *depth, int destwidth, int destheight, int destdepth, int bytesperpixel)
1365 {
1366         const unsigned char *inrow;
1367         int x, y, nextrow;
1368         if (*depth != 1 || destdepth != 1)
1369         {
1370                 Con_Printf ("Image_Resample: 3D resampling not supported\n");
1371                 if (*width > destwidth)
1372                         *width >>= 1;
1373                 if (*height > destheight)
1374                         *height >>= 1;
1375                 if (*depth > destdepth)
1376                         *depth >>= 1;
1377                 return;
1378         }
1379         // note: if given odd width/height this discards the last row/column of
1380         // pixels, rather than doing a proper box-filter scale down
1381         inrow = in;
1382         nextrow = *width * bytesperpixel;
1383         if (*width > destwidth)
1384         {
1385                 *width >>= 1;
1386                 if (*height > destheight)
1387                 {
1388                         // reduce both
1389                         *height >>= 1;
1390                         if (bytesperpixel == 4)
1391                         {
1392                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1393                                 {
1394                                         for (in = inrow, x = 0;x < *width;x++)
1395                                         {
1396                                                 out[0] = (unsigned char) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
1397                                                 out[1] = (unsigned char) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
1398                                                 out[2] = (unsigned char) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
1399                                                 out[3] = (unsigned char) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
1400                                                 out += 4;
1401                                                 in += 8;
1402                                         }
1403                                 }
1404                         }
1405                         else if (bytesperpixel == 3)
1406                         {
1407                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1408                                 {
1409                                         for (in = inrow, x = 0;x < *width;x++)
1410                                         {
1411                                                 out[0] = (unsigned char) ((in[0] + in[3] + in[nextrow  ] + in[nextrow+3]) >> 2);
1412                                                 out[1] = (unsigned char) ((in[1] + in[4] + in[nextrow+1] + in[nextrow+4]) >> 2);
1413                                                 out[2] = (unsigned char) ((in[2] + in[5] + in[nextrow+2] + in[nextrow+5]) >> 2);
1414                                                 out += 3;
1415                                                 in += 6;
1416                                         }
1417                                 }
1418                         }
1419                         else
1420                                 Con_Printf ("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1421                 }
1422                 else
1423                 {
1424                         // reduce width
1425                         if (bytesperpixel == 4)
1426                         {
1427                                 for (y = 0;y < *height;y++, inrow += nextrow)
1428                                 {
1429                                         for (in = inrow, x = 0;x < *width;x++)
1430                                         {
1431                                                 out[0] = (unsigned char) ((in[0] + in[4]) >> 1);
1432                                                 out[1] = (unsigned char) ((in[1] + in[5]) >> 1);
1433                                                 out[2] = (unsigned char) ((in[2] + in[6]) >> 1);
1434                                                 out[3] = (unsigned char) ((in[3] + in[7]) >> 1);
1435                                                 out += 4;
1436                                                 in += 8;
1437                                         }
1438                                 }
1439                         }
1440                         else if (bytesperpixel == 3)
1441                         {
1442                                 for (y = 0;y < *height;y++, inrow += nextrow)
1443                                 {
1444                                         for (in = inrow, x = 0;x < *width;x++)
1445                                         {
1446                                                 out[0] = (unsigned char) ((in[0] + in[3]) >> 1);
1447                                                 out[1] = (unsigned char) ((in[1] + in[4]) >> 1);
1448                                                 out[2] = (unsigned char) ((in[2] + in[5]) >> 1);
1449                                                 out += 3;
1450                                                 in += 6;
1451                                         }
1452                                 }
1453                         }
1454                         else
1455                                 Con_Printf ("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1456                 }
1457         }
1458         else
1459         {
1460                 if (*height > destheight)
1461                 {
1462                         // reduce height
1463                         *height >>= 1;
1464                         if (bytesperpixel == 4)
1465                         {
1466                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1467                                 {
1468                                         for (in = inrow, x = 0;x < *width;x++)
1469                                         {
1470                                                 out[0] = (unsigned char) ((in[0] + in[nextrow  ]) >> 1);
1471                                                 out[1] = (unsigned char) ((in[1] + in[nextrow+1]) >> 1);
1472                                                 out[2] = (unsigned char) ((in[2] + in[nextrow+2]) >> 1);
1473                                                 out[3] = (unsigned char) ((in[3] + in[nextrow+3]) >> 1);
1474                                                 out += 4;
1475                                                 in += 4;
1476                                         }
1477                                 }
1478                         }
1479                         else if (bytesperpixel == 3)
1480                         {
1481                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1482                                 {
1483                                         for (in = inrow, x = 0;x < *width;x++)
1484                                         {
1485                                                 out[0] = (unsigned char) ((in[0] + in[nextrow  ]) >> 1);
1486                                                 out[1] = (unsigned char) ((in[1] + in[nextrow+1]) >> 1);
1487                                                 out[2] = (unsigned char) ((in[2] + in[nextrow+2]) >> 1);
1488                                                 out += 3;
1489                                                 in += 3;
1490                                         }
1491                                 }
1492                         }
1493                         else
1494                                 Con_Printf ("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1495                 }
1496                 else
1497                         Con_Printf ("Image_MipReduce: desired size already achieved\n");
1498         }
1499 }
1500
1501 void Image_HeightmapToNormalmap(const unsigned char *inpixels, unsigned char *outpixels, int width, int height, int clamp, float bumpscale)
1502 {
1503         int x, y, x1, x2, y1, y2;
1504         const unsigned char *b, *row[3];
1505         int p[5];
1506         unsigned char *out;
1507         float iwidth, iheight, ibumpscale, n[3];
1508         iwidth = 1.0f / width;
1509         iheight = 1.0f / height;
1510         ibumpscale = (255.0f * 6.0f) / bumpscale;
1511         out = outpixels;
1512         for (y = 0, y1 = height-1;y < height;y1 = y, y++)
1513         {
1514                 y2 = y + 1;if (y2 >= height) y2 = 0;
1515                 row[0] = inpixels + (y1 * width) * 4;
1516                 row[1] = inpixels + (y  * width) * 4;
1517                 row[2] = inpixels + (y2 * width) * 4;
1518                 for (x = 0, x1 = width-1;x < width;x1 = x, x++)
1519                 {
1520                         x2 = x + 1;if (x2 >= width) x2 = 0;
1521                         // left, right
1522                         b = row[1] + x1 * 4;p[0] = (b[0] + b[1] + b[2]);
1523                         b = row[1] + x2 * 4;p[1] = (b[0] + b[1] + b[2]);
1524                         // above, below
1525                         b = row[0] + x  * 4;p[2] = (b[0] + b[1] + b[2]);
1526                         b = row[2] + x  * 4;p[3] = (b[0] + b[1] + b[2]);
1527                         // center
1528                         b = row[1] + x  * 4;p[4] = (b[0] + b[1] + b[2]);
1529                         // calculate a normal from the slopes
1530                         n[0] = p[0] - p[1];
1531                         n[1] = p[3] - p[2];
1532                         n[2] = ibumpscale;
1533                         VectorNormalize(n);
1534                         // turn it into a dot3 rgb vector texture
1535                         out[0] = (int)(128.0f + n[0] * 127.0f);
1536                         out[1] = (int)(128.0f + n[1] * 127.0f);
1537                         out[2] = (int)(128.0f + n[2] * 127.0f);
1538                         out[3] = (p[4]) / 3;
1539                         out += 4;
1540                 }
1541         }
1542 }
1543
1544 int image_loadskin(imageskin_t *s, const char *shadername)
1545 {
1546         int j;
1547         unsigned char *bumppixels;
1548         int bumppixels_width, bumppixels_height;
1549         char name[MAX_QPATH];
1550         Image_StripImageExtension(shadername, name, sizeof(name));
1551         memset(s, 0, sizeof(*s));
1552         s->basepixels = loadimagepixels(name, false, 0, 0);
1553         if (s->basepixels == NULL)
1554                 return false;
1555         s->basepixels_width = image_width;
1556         s->basepixels_height = image_height;
1557
1558         bumppixels = NULL;bumppixels_width = 0;bumppixels_height = 0;
1559         for (j = 3;j < s->basepixels_width * s->basepixels_height * 4;j += 4)
1560                 if (s->basepixels[j] < 255)
1561                         break;
1562         if (j < s->basepixels_width * s->basepixels_height * 4)
1563         {
1564                 // has transparent pixels
1565                 s->maskpixels = (unsigned char *)Mem_Alloc(loadmodel->mempool, s->basepixels_width * s->basepixels_height * 4);
1566                 s->maskpixels_width = s->basepixels_width;
1567                 s->maskpixels_height = s->basepixels_height;
1568                 memcpy(s->maskpixels, s->basepixels, s->maskpixels_width * s->maskpixels_height * 4);
1569                 for (j = 0;j < s->basepixels_width * s->basepixels_height * 4;j += 4)
1570                 {
1571                         s->maskpixels[j+0] = 255;
1572                         s->maskpixels[j+1] = 255;
1573                         s->maskpixels[j+2] = 255;
1574                 }
1575         }
1576
1577         // _luma is supported for tenebrae compatibility
1578         // (I think it's a very stupid name, but oh well)
1579         if ((s->glowpixels = loadimagepixels(va("%s_glow", name), false, 0, 0)) != NULL
1580          || (s->glowpixels = loadimagepixels(va("%s_luma", name), false, 0, 0)) != NULL)
1581         {
1582                 s->glowpixels_width = image_width;
1583                 s->glowpixels_height = image_height;
1584         }
1585         // _norm is the name used by tenebrae
1586         // (I don't like the name much)
1587         if ((s->nmappixels = loadimagepixels(va("%s_norm", name), false, 0, 0)) != NULL)
1588         {
1589                 s->nmappixels_width = image_width;
1590                 s->nmappixels_height = image_height;
1591         }
1592         else if ((bumppixels = loadimagepixels(va("%s_bump", name), false, 0, 0)) != NULL)
1593         {
1594                 bumppixels_width = image_width;
1595                 bumppixels_height = image_height;
1596         }
1597         if ((s->glosspixels = loadimagepixels(va("%s_gloss", name), false, 0, 0)) != NULL)
1598         {
1599                 s->glosspixels_width = image_width;
1600                 s->glosspixels_height = image_height;
1601         }
1602         if ((s->pantspixels = loadimagepixels(va("%s_pants", name), false, 0, 0)) != NULL)
1603         {
1604                 s->pantspixels_width = image_width;
1605                 s->pantspixels_height = image_height;
1606         }
1607         if ((s->shirtpixels = loadimagepixels(va("%s_shirt", name), false, 0, 0)) != NULL)
1608         {
1609                 s->shirtpixels_width = image_width;
1610                 s->shirtpixels_height = image_height;
1611         }
1612
1613         if (s->nmappixels == NULL)
1614         {
1615                 if (bumppixels != NULL)
1616                 {
1617                         if (r_shadow_bumpscale_bumpmap.value > 0)
1618                         {
1619                                 s->nmappixels = (unsigned char *)Mem_Alloc(loadmodel->mempool, bumppixels_width * bumppixels_height * 4);
1620                                 s->nmappixels_width = bumppixels_width;
1621                                 s->nmappixels_height = bumppixels_height;
1622                                 Image_HeightmapToNormalmap(bumppixels, s->nmappixels, s->nmappixels_width, s->nmappixels_height, false, r_shadow_bumpscale_bumpmap.value);
1623                         }
1624                 }
1625                 else
1626                 {
1627                         if (r_shadow_bumpscale_basetexture.value > 0)
1628                         {
1629                                 s->nmappixels = (unsigned char *)Mem_Alloc(loadmodel->mempool, s->basepixels_width * s->basepixels_height * 4);
1630                                 s->nmappixels_width = s->basepixels_width;
1631                                 s->nmappixels_height = s->basepixels_height;
1632                                 Image_HeightmapToNormalmap(s->basepixels, s->nmappixels, s->nmappixels_width, s->nmappixels_height, false, r_shadow_bumpscale_basetexture.value);
1633                         }
1634                 }
1635         }
1636         if (bumppixels != NULL)
1637                 Mem_Free(bumppixels);
1638         return true;
1639 }
1640
1641 void image_freeskin(imageskin_t *s)
1642 {
1643         if (s->basepixels)
1644                 Mem_Free(s->basepixels);
1645         if (s->maskpixels)
1646                 Mem_Free(s->maskpixels);
1647         if (s->nmappixels)
1648                 Mem_Free(s->nmappixels);
1649         if (s->glowpixels)
1650                 Mem_Free(s->glowpixels);
1651         if (s->glosspixels)
1652                 Mem_Free(s->glosspixels);
1653         if (s->pantspixels)
1654                 Mem_Free(s->pantspixels);
1655         if (s->shirtpixels)
1656                 Mem_Free(s->shirtpixels);
1657         memset(s, 0, sizeof(*s));
1658 }
1659