save 24bit tga if alpha channel is entirely 255
[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 void Image_StripImageExtension (const char *in, char *out, size_t size_out)
766 {
767         const char *ext;
768
769         if (size_out == 0)
770                 return;
771
772         ext = FS_FileExtension(in);
773         if (ext && (!strcmp(ext, "tga") || !strcmp(ext, "pcx") || !strcmp(ext, "lmp") || !strcmp(ext, "png") || !strcmp(ext, "jpg")))
774                 FS_StripExtension(in, out, size_out);
775         else
776                 strlcpy(out, in, size_out);
777 }
778
779 typedef struct imageformat_s
780 {
781         const char *formatstring;
782         unsigned char *(*loadfunc)(const unsigned char *f, int filesize, int matchwidth, int matchheight);
783 }
784 imageformat_t;
785
786 // GAME_TENEBRAE only
787 imageformat_t imageformats_tenebrae[] =
788 {
789         {"override/%s.tga", LoadTGA},
790         {"override/%s.png", PNG_LoadImage},
791         {"override/%s.jpg", JPEG_LoadImage},
792         {"override/%s.pcx", LoadPCX},
793         {NULL, NULL}
794 };
795
796 imageformat_t imageformats_nopath[] =
797 {
798         {"override/%s.tga", LoadTGA},
799         {"override/%s.png", PNG_LoadImage},
800         {"override/%s.jpg", JPEG_LoadImage},
801         {"textures/%s.tga", LoadTGA},
802         {"textures/%s.png", PNG_LoadImage},
803         {"textures/%s.jpg", JPEG_LoadImage},
804         {"%s.tga", LoadTGA},
805         {"%s.png", PNG_LoadImage},
806         {"%s.jpg", JPEG_LoadImage},
807         {"%s.pcx", LoadPCX},
808         {NULL, NULL}
809 };
810
811 imageformat_t imageformats_textures[] =
812 {
813         {"%s.tga", LoadTGA},
814         {"%s.png", PNG_LoadImage},
815         {"%s.jpg", JPEG_LoadImage},
816         {"%s.pcx", LoadPCX},
817         {"%s.wal", LoadWAL},
818         {NULL, NULL}
819 };
820
821 imageformat_t imageformats_gfx[] =
822 {
823         {"%s.tga", LoadTGA},
824         {"%s.png", PNG_LoadImage},
825         {"%s.jpg", JPEG_LoadImage},
826         {"%s.pcx", LoadPCX},
827         {NULL, NULL}
828 };
829
830 imageformat_t imageformats_other[] =
831 {
832         {"%s.tga", LoadTGA},
833         {"%s.png", PNG_LoadImage},
834         {"%s.jpg", JPEG_LoadImage},
835         {"%s.pcx", LoadPCX},
836         {NULL, NULL}
837 };
838
839 unsigned char *loadimagepixels (const char *filename, qboolean complain, int matchwidth, int matchheight)
840 {
841         fs_offset_t filesize;
842         imageformat_t *firstformat, *format;
843         unsigned char *f, *data = NULL;
844         char basename[MAX_QPATH], name[MAX_QPATH], *c;
845         if (developer_memorydebug.integer)
846                 Mem_CheckSentinelsGlobal();
847         if (developer_texturelogging.integer)
848                 Log_Printf("textures.log", "%s\n", filename);
849         Image_StripImageExtension(filename, basename, sizeof(basename)); // strip filename extensions to allow replacement by other types
850         // replace *'s with #, so commandline utils don't get confused when dealing with the external files
851         for (c = basename;*c;c++)
852                 if (*c == '*')
853                         *c = '#';
854         name[0] = 0;
855         if (strchr(basename, '/'))
856         {
857                 int i;
858                 for (i = 0;i < (int)sizeof(name)-1 && basename[i] != '/';i++)
859                         name[i] = basename[i];
860                 name[i] = 0;
861         }
862         if (gamemode == GAME_TENEBRAE)
863                 firstformat = imageformats_tenebrae;
864         else if (!strcasecmp(name, "textures"))
865                 firstformat = imageformats_textures;
866         else if (!strcasecmp(name, "gfx"))
867                 firstformat = imageformats_gfx;
868         else if (!strchr(basename, '/'))
869                 firstformat = imageformats_nopath;
870         else
871                 firstformat = imageformats_other;
872         // now try all the formats in the selected list
873         for (format = firstformat;format->formatstring;format++)
874         {
875                 sprintf (name, format->formatstring, basename);
876                 f = FS_LoadFile(name, tempmempool, true, &filesize);
877                 if (f)
878                 {
879                         data = format->loadfunc(f, filesize, matchwidth, matchheight);
880                         Mem_Free(f);
881                         if (data)
882                         {
883                                 if (developer.integer >= 10)
884                                         Con_Printf("loaded image %s (%dx%d)\n", name, image_width, image_height);
885                                 if (developer_memorydebug.integer)
886                                         Mem_CheckSentinelsGlobal();
887                                 return data;
888                         }
889                         else
890                         {
891                                 if (developer.integer >= 1)
892                                         Con_DPrintf("Error loading image %s (file loaded but decode failed)\n", name);
893                         }
894                 }
895         }
896         if (complain)
897         {
898                 Con_Printf("Couldn't load %s using ", filename);
899                 for (format = firstformat;format->formatstring;format++)
900                 {
901                         sprintf (name, format->formatstring, basename);
902                         Con_Printf(format == firstformat ? "\"%s\"" : (format[1].formatstring ? ", \"%s\"" : " or \"%s\".\n"), format->formatstring);
903                 }
904         }
905         if (developer_memorydebug.integer)
906                 Mem_CheckSentinelsGlobal();
907         return NULL;
908 }
909
910 rtexture_t *loadtextureimage (rtexturepool_t *pool, const char *filename, int matchwidth, int matchheight, qboolean complain, int flags)
911 {
912         unsigned char *data;
913         rtexture_t *rt;
914         if (!(data = loadimagepixels (filename, complain, matchwidth, matchheight)))
915                 return 0;
916         rt = R_LoadTexture2D(pool, filename, image_width, image_height, data, TEXTYPE_RGBA, flags, NULL);
917         Mem_Free(data);
918         return rt;
919 }
920
921 qboolean Image_WriteTGARGB_preflipped (const char *filename, int width, int height, const unsigned char *data, unsigned char *buffer)
922 {
923         qboolean ret;
924         unsigned char *out;
925         const unsigned char *in, *end;
926
927         memset (buffer, 0, 18);
928         buffer[2] = 2;          // uncompressed type
929         buffer[12] = (width >> 0) & 0xFF;
930         buffer[13] = (width >> 8) & 0xFF;
931         buffer[14] = (height >> 0) & 0xFF;
932         buffer[15] = (height >> 8) & 0xFF;
933         buffer[16] = 24;        // pixel size
934
935         // swap rgb to bgr
936         in = data;
937         out = buffer + 18;
938         end = in + width*height*3;
939         for (;in < end;in += 3)
940         {
941                 *out++ = in[2];
942                 *out++ = in[1];
943                 *out++ = in[0];
944         }
945         ret = FS_WriteFile (filename, buffer, width*height*3 + 18 );
946
947         return ret;
948 }
949
950 void Image_WriteTGARGBA (const char *filename, int width, int height, const unsigned char *data)
951 {
952         int y;
953         unsigned char *buffer, *out;
954         const unsigned char *in, *end;
955
956         buffer = (unsigned char *)Mem_Alloc(tempmempool, width*height*4 + 18);
957
958         memset (buffer, 0, 18);
959         buffer[2] = 2;          // uncompressed type
960         buffer[12] = (width >> 0) & 0xFF;
961         buffer[13] = (width >> 8) & 0xFF;
962         buffer[14] = (height >> 0) & 0xFF;
963         buffer[15] = (height >> 8) & 0xFF;
964
965         for (y = 3;y < width*height*4;y += 4)
966                 if (data[y] < 255)
967                         break;
968
969         if (y < width*height*4)
970         {
971                 // save the alpha channel
972                 buffer[16] = 32;        // pixel size
973                 buffer[17] = 8; // 8 bits of alpha
974
975                 // swap rgba to bgra and flip upside down
976                 out = buffer + 18;
977                 for (y = height - 1;y >= 0;y--)
978                 {
979                         in = data + y * width * 4;
980                         end = in + width * 4;
981                         for (;in < end;in += 4)
982                         {
983                                 *out++ = in[2];
984                                 *out++ = in[1];
985                                 *out++ = in[0];
986                                 *out++ = in[3];
987                         }
988                 }
989                 FS_WriteFile (filename, buffer, width*height*4 + 18 );
990         }
991         else
992         {
993                 // save only the color channels
994                 buffer[16] = 24;        // pixel size
995                 buffer[17] = 0; // 8 bits of alpha
996
997                 // swap rgba to bgr and flip upside down
998                 out = buffer + 18;
999                 for (y = height - 1;y >= 0;y--)
1000                 {
1001                         in = data + y * width * 4;
1002                         end = in + width * 4;
1003                         for (;in < end;in += 4)
1004                         {
1005                                 *out++ = in[2];
1006                                 *out++ = in[1];
1007                                 *out++ = in[0];
1008                         }
1009                 }
1010                 FS_WriteFile (filename, buffer, width*height*3 + 18 );
1011         }
1012
1013         Mem_Free(buffer);
1014 }
1015
1016 static void Image_Resample32LerpLine (const unsigned char *in, unsigned char *out, int inwidth, int outwidth)
1017 {
1018         int             j, xi, oldx = 0, f, fstep, endx, lerp;
1019         fstep = (int) (inwidth*65536.0f/outwidth);
1020         endx = (inwidth-1);
1021         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
1022         {
1023                 xi = f >> 16;
1024                 if (xi != oldx)
1025                 {
1026                         in += (xi - oldx) * 4;
1027                         oldx = xi;
1028                 }
1029                 if (xi < endx)
1030                 {
1031                         lerp = f & 0xFFFF;
1032                         *out++ = (unsigned char) ((((in[4] - in[0]) * lerp) >> 16) + in[0]);
1033                         *out++ = (unsigned char) ((((in[5] - in[1]) * lerp) >> 16) + in[1]);
1034                         *out++ = (unsigned char) ((((in[6] - in[2]) * lerp) >> 16) + in[2]);
1035                         *out++ = (unsigned char) ((((in[7] - in[3]) * lerp) >> 16) + in[3]);
1036                 }
1037                 else // last pixel of the line has no pixel to lerp to
1038                 {
1039                         *out++ = in[0];
1040                         *out++ = in[1];
1041                         *out++ = in[2];
1042                         *out++ = in[3];
1043                 }
1044         }
1045 }
1046
1047 static void Image_Resample24LerpLine (const unsigned char *in, unsigned char *out, int inwidth, int outwidth)
1048 {
1049         int             j, xi, oldx = 0, f, fstep, endx, lerp;
1050         fstep = (int) (inwidth*65536.0f/outwidth);
1051         endx = (inwidth-1);
1052         for (j = 0,f = 0;j < outwidth;j++, f += fstep)
1053         {
1054                 xi = f >> 16;
1055                 if (xi != oldx)
1056                 {
1057                         in += (xi - oldx) * 3;
1058                         oldx = xi;
1059                 }
1060                 if (xi < endx)
1061                 {
1062                         lerp = f & 0xFFFF;
1063                         *out++ = (unsigned char) ((((in[3] - in[0]) * lerp) >> 16) + in[0]);
1064                         *out++ = (unsigned char) ((((in[4] - in[1]) * lerp) >> 16) + in[1]);
1065                         *out++ = (unsigned char) ((((in[5] - in[2]) * lerp) >> 16) + in[2]);
1066                 }
1067                 else // last pixel of the line has no pixel to lerp to
1068                 {
1069                         *out++ = in[0];
1070                         *out++ = in[1];
1071                         *out++ = in[2];
1072                 }
1073         }
1074 }
1075
1076 #define LERPBYTE(i) r = resamplerow1[i];out[i] = (unsigned char) ((((resamplerow2[i] - r) * lerp) >> 16) + r)
1077 void Image_Resample32Lerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1078 {
1079         int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth4 = inwidth*4, outwidth4 = outwidth*4;
1080         unsigned char *out;
1081         const unsigned char *inrow;
1082         unsigned char *resamplerow1;
1083         unsigned char *resamplerow2;
1084         out = (unsigned char *)outdata;
1085         fstep = (int) (inheight*65536.0f/outheight);
1086
1087         resamplerow1 = (unsigned char *)Mem_Alloc(tempmempool, outwidth*4*2);
1088         resamplerow2 = resamplerow1 + outwidth*4;
1089
1090         inrow = (const unsigned char *)indata;
1091         oldy = 0;
1092         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
1093         Image_Resample32LerpLine (inrow + inwidth4, resamplerow2, inwidth, outwidth);
1094         for (i = 0, f = 0;i < outheight;i++,f += fstep)
1095         {
1096                 yi = f >> 16;
1097                 if (yi < endy)
1098                 {
1099                         lerp = f & 0xFFFF;
1100                         if (yi != oldy)
1101                         {
1102                                 inrow = (unsigned char *)indata + inwidth4*yi;
1103                                 if (yi == oldy+1)
1104                                         memcpy(resamplerow1, resamplerow2, outwidth4);
1105                                 else
1106                                         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
1107                                 Image_Resample32LerpLine (inrow + inwidth4, resamplerow2, inwidth, outwidth);
1108                                 oldy = yi;
1109                         }
1110                         j = outwidth - 4;
1111                         while(j >= 0)
1112                         {
1113                                 LERPBYTE( 0);
1114                                 LERPBYTE( 1);
1115                                 LERPBYTE( 2);
1116                                 LERPBYTE( 3);
1117                                 LERPBYTE( 4);
1118                                 LERPBYTE( 5);
1119                                 LERPBYTE( 6);
1120                                 LERPBYTE( 7);
1121                                 LERPBYTE( 8);
1122                                 LERPBYTE( 9);
1123                                 LERPBYTE(10);
1124                                 LERPBYTE(11);
1125                                 LERPBYTE(12);
1126                                 LERPBYTE(13);
1127                                 LERPBYTE(14);
1128                                 LERPBYTE(15);
1129                                 out += 16;
1130                                 resamplerow1 += 16;
1131                                 resamplerow2 += 16;
1132                                 j -= 4;
1133                         }
1134                         if (j & 2)
1135                         {
1136                                 LERPBYTE( 0);
1137                                 LERPBYTE( 1);
1138                                 LERPBYTE( 2);
1139                                 LERPBYTE( 3);
1140                                 LERPBYTE( 4);
1141                                 LERPBYTE( 5);
1142                                 LERPBYTE( 6);
1143                                 LERPBYTE( 7);
1144                                 out += 8;
1145                                 resamplerow1 += 8;
1146                                 resamplerow2 += 8;
1147                         }
1148                         if (j & 1)
1149                         {
1150                                 LERPBYTE( 0);
1151                                 LERPBYTE( 1);
1152                                 LERPBYTE( 2);
1153                                 LERPBYTE( 3);
1154                                 out += 4;
1155                                 resamplerow1 += 4;
1156                                 resamplerow2 += 4;
1157                         }
1158                         resamplerow1 -= outwidth4;
1159                         resamplerow2 -= outwidth4;
1160                 }
1161                 else
1162                 {
1163                         if (yi != oldy)
1164                         {
1165                                 inrow = (unsigned char *)indata + inwidth4*yi;
1166                                 if (yi == oldy+1)
1167                                         memcpy(resamplerow1, resamplerow2, outwidth4);
1168                                 else
1169                                         Image_Resample32LerpLine (inrow, resamplerow1, inwidth, outwidth);
1170                                 oldy = yi;
1171                         }
1172                         memcpy(out, resamplerow1, outwidth4);
1173                 }
1174         }
1175
1176         Mem_Free(resamplerow1);
1177         resamplerow1 = NULL;
1178         resamplerow2 = NULL;
1179 }
1180
1181 void Image_Resample32Nolerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1182 {
1183         int i, j;
1184         unsigned frac, fracstep;
1185         // relies on int being 4 bytes
1186         int *inrow, *out;
1187         out = (int *)outdata;
1188
1189         fracstep = inwidth*0x10000/outwidth;
1190         for (i = 0;i < outheight;i++)
1191         {
1192                 inrow = (int *)indata + inwidth*(i*inheight/outheight);
1193                 frac = fracstep >> 1;
1194                 j = outwidth - 4;
1195                 while (j >= 0)
1196                 {
1197                         out[0] = inrow[frac >> 16];frac += fracstep;
1198                         out[1] = inrow[frac >> 16];frac += fracstep;
1199                         out[2] = inrow[frac >> 16];frac += fracstep;
1200                         out[3] = inrow[frac >> 16];frac += fracstep;
1201                         out += 4;
1202                         j -= 4;
1203                 }
1204                 if (j & 2)
1205                 {
1206                         out[0] = inrow[frac >> 16];frac += fracstep;
1207                         out[1] = inrow[frac >> 16];frac += fracstep;
1208                         out += 2;
1209                 }
1210                 if (j & 1)
1211                 {
1212                         out[0] = inrow[frac >> 16];frac += fracstep;
1213                         out += 1;
1214                 }
1215         }
1216 }
1217
1218 void Image_Resample24Lerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1219 {
1220         int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth3 = inwidth * 3, outwidth3 = outwidth * 3;
1221         unsigned char *out;
1222         const unsigned char *inrow;
1223         unsigned char *resamplerow1;
1224         unsigned char *resamplerow2;
1225         out = (unsigned char *)outdata;
1226         fstep = (int) (inheight*65536.0f/outheight);
1227
1228         resamplerow1 = (unsigned char *)Mem_Alloc(tempmempool, outwidth*3*2);
1229         resamplerow2 = resamplerow1 + outwidth*3;
1230
1231         inrow = (const unsigned char *)indata;
1232         oldy = 0;
1233         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1234         Image_Resample24LerpLine (inrow + inwidth3, resamplerow2, inwidth, outwidth);
1235         for (i = 0, f = 0;i < outheight;i++,f += fstep)
1236         {
1237                 yi = f >> 16;
1238                 if (yi < endy)
1239                 {
1240                         lerp = f & 0xFFFF;
1241                         if (yi != oldy)
1242                         {
1243                                 inrow = (unsigned char *)indata + inwidth3*yi;
1244                                 if (yi == oldy+1)
1245                                         memcpy(resamplerow1, resamplerow2, outwidth3);
1246                                 else
1247                                         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1248                                 Image_Resample24LerpLine (inrow + inwidth3, resamplerow2, inwidth, outwidth);
1249                                 oldy = yi;
1250                         }
1251                         j = outwidth - 4;
1252                         while(j >= 0)
1253                         {
1254                                 LERPBYTE( 0);
1255                                 LERPBYTE( 1);
1256                                 LERPBYTE( 2);
1257                                 LERPBYTE( 3);
1258                                 LERPBYTE( 4);
1259                                 LERPBYTE( 5);
1260                                 LERPBYTE( 6);
1261                                 LERPBYTE( 7);
1262                                 LERPBYTE( 8);
1263                                 LERPBYTE( 9);
1264                                 LERPBYTE(10);
1265                                 LERPBYTE(11);
1266                                 out += 12;
1267                                 resamplerow1 += 12;
1268                                 resamplerow2 += 12;
1269                                 j -= 4;
1270                         }
1271                         if (j & 2)
1272                         {
1273                                 LERPBYTE( 0);
1274                                 LERPBYTE( 1);
1275                                 LERPBYTE( 2);
1276                                 LERPBYTE( 3);
1277                                 LERPBYTE( 4);
1278                                 LERPBYTE( 5);
1279                                 out += 6;
1280                                 resamplerow1 += 6;
1281                                 resamplerow2 += 6;
1282                         }
1283                         if (j & 1)
1284                         {
1285                                 LERPBYTE( 0);
1286                                 LERPBYTE( 1);
1287                                 LERPBYTE( 2);
1288                                 out += 3;
1289                                 resamplerow1 += 3;
1290                                 resamplerow2 += 3;
1291                         }
1292                         resamplerow1 -= outwidth3;
1293                         resamplerow2 -= outwidth3;
1294                 }
1295                 else
1296                 {
1297                         if (yi != oldy)
1298                         {
1299                                 inrow = (unsigned char *)indata + inwidth3*yi;
1300                                 if (yi == oldy+1)
1301                                         memcpy(resamplerow1, resamplerow2, outwidth3);
1302                                 else
1303                                         Image_Resample24LerpLine (inrow, resamplerow1, inwidth, outwidth);
1304                                 oldy = yi;
1305                         }
1306                         memcpy(out, resamplerow1, outwidth3);
1307                 }
1308         }
1309         Mem_Free(resamplerow1);
1310         resamplerow1 = NULL;
1311         resamplerow2 = NULL;
1312 }
1313
1314 void Image_Resample24Nolerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
1315 {
1316         int i, j, f, inwidth3 = inwidth * 3;
1317         unsigned frac, fracstep;
1318         unsigned char *inrow, *out;
1319         out = (unsigned char *)outdata;
1320
1321         fracstep = inwidth*0x10000/outwidth;
1322         for (i = 0;i < outheight;i++)
1323         {
1324                 inrow = (unsigned char *)indata + inwidth3*(i*inheight/outheight);
1325                 frac = fracstep >> 1;
1326                 j = outwidth - 4;
1327                 while (j >= 0)
1328                 {
1329                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1330                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1331                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1332                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1333                         j -= 4;
1334                 }
1335                 if (j & 2)
1336                 {
1337                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1338                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1339                         out += 2;
1340                 }
1341                 if (j & 1)
1342                 {
1343                         f = (frac >> 16)*3;*out++ = inrow[f+0];*out++ = inrow[f+1];*out++ = inrow[f+2];frac += fracstep;
1344                         out += 1;
1345                 }
1346         }
1347 }
1348
1349 /*
1350 ================
1351 Image_Resample
1352 ================
1353 */
1354 void Image_Resample (const void *indata, int inwidth, int inheight, int indepth, void *outdata, int outwidth, int outheight, int outdepth, int bytesperpixel, int quality)
1355 {
1356         if (indepth != 1 || outdepth != 1)
1357         {
1358                 Con_Printf ("Image_Resample: 3D resampling not supported\n");
1359                 return;
1360         }
1361         if (bytesperpixel == 4)
1362         {
1363                 if (quality)
1364                         Image_Resample32Lerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1365                 else
1366                         Image_Resample32Nolerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1367         }
1368         else if (bytesperpixel == 3)
1369         {
1370                 if (quality)
1371                         Image_Resample24Lerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1372                 else
1373                         Image_Resample24Nolerp(indata, inwidth, inheight, outdata, outwidth, outheight);
1374         }
1375         else
1376                 Con_Printf ("Image_Resample: unsupported bytesperpixel %i\n", bytesperpixel);
1377 }
1378
1379 // in can be the same as out
1380 void Image_MipReduce(const unsigned char *in, unsigned char *out, int *width, int *height, int *depth, int destwidth, int destheight, int destdepth, int bytesperpixel)
1381 {
1382         const unsigned char *inrow;
1383         int x, y, nextrow;
1384         if (*depth != 1 || destdepth != 1)
1385         {
1386                 Con_Printf ("Image_Resample: 3D resampling not supported\n");
1387                 if (*width > destwidth)
1388                         *width >>= 1;
1389                 if (*height > destheight)
1390                         *height >>= 1;
1391                 if (*depth > destdepth)
1392                         *depth >>= 1;
1393                 return;
1394         }
1395         // note: if given odd width/height this discards the last row/column of
1396         // pixels, rather than doing a proper box-filter scale down
1397         inrow = in;
1398         nextrow = *width * bytesperpixel;
1399         if (*width > destwidth)
1400         {
1401                 *width >>= 1;
1402                 if (*height > destheight)
1403                 {
1404                         // reduce both
1405                         *height >>= 1;
1406                         if (bytesperpixel == 4)
1407                         {
1408                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1409                                 {
1410                                         for (in = inrow, x = 0;x < *width;x++)
1411                                         {
1412                                                 out[0] = (unsigned char) ((in[0] + in[4] + in[nextrow  ] + in[nextrow+4]) >> 2);
1413                                                 out[1] = (unsigned char) ((in[1] + in[5] + in[nextrow+1] + in[nextrow+5]) >> 2);
1414                                                 out[2] = (unsigned char) ((in[2] + in[6] + in[nextrow+2] + in[nextrow+6]) >> 2);
1415                                                 out[3] = (unsigned char) ((in[3] + in[7] + in[nextrow+3] + in[nextrow+7]) >> 2);
1416                                                 out += 4;
1417                                                 in += 8;
1418                                         }
1419                                 }
1420                         }
1421                         else if (bytesperpixel == 3)
1422                         {
1423                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1424                                 {
1425                                         for (in = inrow, x = 0;x < *width;x++)
1426                                         {
1427                                                 out[0] = (unsigned char) ((in[0] + in[3] + in[nextrow  ] + in[nextrow+3]) >> 2);
1428                                                 out[1] = (unsigned char) ((in[1] + in[4] + in[nextrow+1] + in[nextrow+4]) >> 2);
1429                                                 out[2] = (unsigned char) ((in[2] + in[5] + in[nextrow+2] + in[nextrow+5]) >> 2);
1430                                                 out += 3;
1431                                                 in += 6;
1432                                         }
1433                                 }
1434                         }
1435                         else
1436                                 Con_Printf ("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1437                 }
1438                 else
1439                 {
1440                         // reduce width
1441                         if (bytesperpixel == 4)
1442                         {
1443                                 for (y = 0;y < *height;y++, inrow += nextrow)
1444                                 {
1445                                         for (in = inrow, x = 0;x < *width;x++)
1446                                         {
1447                                                 out[0] = (unsigned char) ((in[0] + in[4]) >> 1);
1448                                                 out[1] = (unsigned char) ((in[1] + in[5]) >> 1);
1449                                                 out[2] = (unsigned char) ((in[2] + in[6]) >> 1);
1450                                                 out[3] = (unsigned char) ((in[3] + in[7]) >> 1);
1451                                                 out += 4;
1452                                                 in += 8;
1453                                         }
1454                                 }
1455                         }
1456                         else if (bytesperpixel == 3)
1457                         {
1458                                 for (y = 0;y < *height;y++, inrow += nextrow)
1459                                 {
1460                                         for (in = inrow, x = 0;x < *width;x++)
1461                                         {
1462                                                 out[0] = (unsigned char) ((in[0] + in[3]) >> 1);
1463                                                 out[1] = (unsigned char) ((in[1] + in[4]) >> 1);
1464                                                 out[2] = (unsigned char) ((in[2] + in[5]) >> 1);
1465                                                 out += 3;
1466                                                 in += 6;
1467                                         }
1468                                 }
1469                         }
1470                         else
1471                                 Con_Printf ("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1472                 }
1473         }
1474         else
1475         {
1476                 if (*height > destheight)
1477                 {
1478                         // reduce height
1479                         *height >>= 1;
1480                         if (bytesperpixel == 4)
1481                         {
1482                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1483                                 {
1484                                         for (in = inrow, x = 0;x < *width;x++)
1485                                         {
1486                                                 out[0] = (unsigned char) ((in[0] + in[nextrow  ]) >> 1);
1487                                                 out[1] = (unsigned char) ((in[1] + in[nextrow+1]) >> 1);
1488                                                 out[2] = (unsigned char) ((in[2] + in[nextrow+2]) >> 1);
1489                                                 out[3] = (unsigned char) ((in[3] + in[nextrow+3]) >> 1);
1490                                                 out += 4;
1491                                                 in += 4;
1492                                         }
1493                                 }
1494                         }
1495                         else if (bytesperpixel == 3)
1496                         {
1497                                 for (y = 0;y < *height;y++, inrow += nextrow * 2)
1498                                 {
1499                                         for (in = inrow, x = 0;x < *width;x++)
1500                                         {
1501                                                 out[0] = (unsigned char) ((in[0] + in[nextrow  ]) >> 1);
1502                                                 out[1] = (unsigned char) ((in[1] + in[nextrow+1]) >> 1);
1503                                                 out[2] = (unsigned char) ((in[2] + in[nextrow+2]) >> 1);
1504                                                 out += 3;
1505                                                 in += 3;
1506                                         }
1507                                 }
1508                         }
1509                         else
1510                                 Con_Printf ("Image_MipReduce: unsupported bytesperpixel %i\n", bytesperpixel);
1511                 }
1512                 else
1513                         Con_Printf ("Image_MipReduce: desired size already achieved\n");
1514         }
1515 }
1516
1517 void Image_HeightmapToNormalmap(const unsigned char *inpixels, unsigned char *outpixels, int width, int height, int clamp, float bumpscale)
1518 {
1519         int x, y, x1, x2, y1, y2;
1520         const unsigned char *b, *row[3];
1521         int p[5];
1522         unsigned char *out;
1523         float iwidth, iheight, ibumpscale, n[3];
1524         iwidth = 1.0f / width;
1525         iheight = 1.0f / height;
1526         ibumpscale = (255.0f * 6.0f) / bumpscale;
1527         out = outpixels;
1528         for (y = 0, y1 = height-1;y < height;y1 = y, y++)
1529         {
1530                 y2 = y + 1;if (y2 >= height) y2 = 0;
1531                 row[0] = inpixels + (y1 * width) * 4;
1532                 row[1] = inpixels + (y  * width) * 4;
1533                 row[2] = inpixels + (y2 * width) * 4;
1534                 for (x = 0, x1 = width-1;x < width;x1 = x, x++)
1535                 {
1536                         x2 = x + 1;if (x2 >= width) x2 = 0;
1537                         // left, right
1538                         b = row[1] + x1 * 4;p[0] = (b[0] + b[1] + b[2]);
1539                         b = row[1] + x2 * 4;p[1] = (b[0] + b[1] + b[2]);
1540                         // above, below
1541                         b = row[0] + x  * 4;p[2] = (b[0] + b[1] + b[2]);
1542                         b = row[2] + x  * 4;p[3] = (b[0] + b[1] + b[2]);
1543                         // center
1544                         b = row[1] + x  * 4;p[4] = (b[0] + b[1] + b[2]);
1545                         // calculate a normal from the slopes
1546                         n[0] = p[0] - p[1];
1547                         n[1] = p[3] - p[2];
1548                         n[2] = ibumpscale;
1549                         VectorNormalize(n);
1550                         // turn it into a dot3 rgb vector texture
1551                         out[0] = (int)(128.0f + n[0] * 127.0f);
1552                         out[1] = (int)(128.0f + n[1] * 127.0f);
1553                         out[2] = (int)(128.0f + n[2] * 127.0f);
1554                         out[3] = (p[4]) / 3;
1555                         out += 4;
1556                 }
1557         }
1558 }