16fb1fdf4aa982cd39702ae636c0111c57250150
[blender.git] / source / blender / imbuf / intern / filter.c
1 /*
2  *
3  * ***** BEGIN GPL LICENSE BLOCK *****
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version 2
8  * of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18  *
19  * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
20  * All rights reserved.
21  *
22  * The Original Code is: all of this file.
23  *
24  * Contributor(s): none yet.
25  *
26  * ***** END GPL LICENSE BLOCK *****
27  * filter.c
28  *
29  * $Id$
30  */
31
32 /** \file blender/imbuf/intern/filter.c
33  *  \ingroup imbuf
34  */
35
36
37 #include "MEM_guardedalloc.h"
38
39 #include "BLI_utildefines.h"
40
41
42
43 #include "IMB_imbuf_types.h"
44 #include "IMB_imbuf.h"
45 #include "IMB_filter.h"
46
47 #include "imbuf.h"
48
49 /************************************************************************/
50 /*                              FILTERS                                 */
51 /************************************************************************/
52
53 static void filtrow(unsigned char *point, int x)
54 {
55         unsigned int c1,c2,c3,error;
56
57         if (x>1){
58                 c1 = c2 = *point;
59                 error = 2;
60                 for(x--;x>0;x--){
61                         c3 = point[4];
62                         c1 += (c2<<1) + c3 + error;
63                         error = c1 & 3;
64                         *point = c1 >> 2;
65                         point += 4;
66                         c1=c2;
67                         c2=c3;
68                 }
69                 *point = (c1 + (c2<<1) + c2 + error) >> 2;
70         }
71 }
72
73 static void filtrowf(float *point, int x)
74 {
75         float c1,c2,c3;
76         
77         if (x>1){
78                 c1 = c2 = *point;
79                 for(x--;x>0;x--){
80                         c3 = point[4];
81                         c1 += (c2 * 2) + c3;
82                         *point = 0.25f*c1;
83                         point += 4;
84                         c1=c2;
85                         c2=c3;
86                 }
87                 *point = 0.25f*(c1 + (c2 * 2) + c2);
88         }
89 }
90
91
92
93 static void filtcolum(unsigned char *point, int y, int skip)
94 {
95         unsigned int c1,c2,c3,error;
96         unsigned char *point2;
97
98         if (y>1){
99                 c1 = c2 = *point;
100                 point2 = point;
101                 error = 2;
102                 for(y--;y>0;y--){
103                         point2 += skip;
104                         c3 = *point2;
105                         c1 += (c2<<1) + c3 +error;
106                         error = c1 & 3;
107                         *point = c1 >> 2;
108                         point=point2;
109                         c1=c2;
110                         c2=c3;
111                 }
112                 *point = (c1 + (c2<<1) + c2 + error) >> 2;
113         }
114 }
115
116 static void filtcolumf(float *point, int y, int skip)
117 {
118         float c1,c2,c3, *point2;
119         
120         if (y>1){
121                 c1 = c2 = *point;
122                 point2 = point;
123                 for(y--;y>0;y--){
124                         point2 += skip;
125                         c3 = *point2;
126                         c1 += (c2 * 2) + c3;
127                         *point = 0.25f*c1;
128                         point=point2;
129                         c1=c2;
130                         c2=c3;
131                 }
132                 *point = 0.25f*(c1 + (c2 * 2) + c2);
133         }
134 }
135
136 void IMB_filtery(struct ImBuf *ibuf)
137 {
138         unsigned char *point;
139         float *pointf;
140         int x, y, skip;
141
142         point = (unsigned char *)ibuf->rect;
143         pointf = ibuf->rect_float;
144
145         x = ibuf->x;
146         y = ibuf->y;
147         skip = x<<2;
148
149         for (;x>0;x--){
150                 if (point) {
151                         if (ibuf->depth > 24) filtcolum(point,y,skip);
152                         point++;
153                         filtcolum(point,y,skip);
154                         point++;
155                         filtcolum(point,y,skip);
156                         point++;
157                         filtcolum(point,y,skip);
158                         point++;
159                 }
160                 if (pointf) {
161                         if (ibuf->depth > 24) filtcolumf(pointf,y,skip);
162                         pointf++;
163                         filtcolumf(pointf,y,skip);
164                         pointf++;
165                         filtcolumf(pointf,y,skip);
166                         pointf++;
167                         filtcolumf(pointf,y,skip);
168                         pointf++;
169                 }
170         }
171 }
172
173
174 void imb_filterx(struct ImBuf *ibuf)
175 {
176         unsigned char *point;
177         float *pointf;
178         int x, y, skip;
179
180         point = (unsigned char *)ibuf->rect;
181         pointf = ibuf->rect_float;
182
183         x = ibuf->x;
184         y = ibuf->y;
185         skip = (x<<2) - 3;
186
187         for (;y>0;y--){
188                 if (point) {
189                         if (ibuf->depth > 24) filtrow(point,x);
190                         point++;
191                         filtrow(point,x);
192                         point++;
193                         filtrow(point,x);
194                         point++;
195                         filtrow(point,x);
196                         point+=skip;
197                 }
198                 if (pointf) {
199                         if (ibuf->depth > 24) filtrowf(pointf,x);
200                         pointf++;
201                         filtrowf(pointf,x);
202                         pointf++;
203                         filtrowf(pointf,x);
204                         pointf++;
205                         filtrowf(pointf,x);
206                         pointf+=skip;
207                 }
208         }
209 }
210
211 void IMB_filterN(ImBuf *out, ImBuf *in)
212 {
213         register char *row1, *row2, *row3;
214         register char *cp, *r11, *r13, *r21, *r23, *r31, *r33;
215         int rowlen, x, y;
216         
217         rowlen= in->x;
218         
219         for(y=0; y<in->y; y++) {
220                 /* setup rows */
221                 row2= (char*)(in->rect + y*rowlen);
222                 row1= (y == 0)? row2: row2 - 4*rowlen;
223                 row3= (y == in->y-1)? row2: row2 + 4*rowlen;
224                 
225                 cp= (char *)(out->rect + y*rowlen);
226                 
227                 for(x=0; x<rowlen; x++) {
228                         if(x == 0) {
229                                 r11 = row1;
230                                 r21 = row1;
231                                 r31 = row1;
232                         }
233                         else {
234                                 r11 = row1-4;
235                                 r21 = row1-4;
236                                 r31 = row1-4;
237                         }
238
239                         if(x == rowlen-1) {
240                                 r13 = row1;
241                                 r23 = row1;
242                                 r33 = row1;
243                         }
244                         else {
245                                 r13 = row1+4;
246                                 r23 = row1+4;
247                                 r33 = row1+4;
248                         }
249
250                         cp[0]= (r11[0] + 2*row1[0] + r13[0] + 2*r21[0] + 4*row2[0] + 2*r23[0] + r31[0] + 2*row3[0] + r33[0])>>4;
251                         cp[1]= (r11[1] + 2*row1[1] + r13[1] + 2*r21[1] + 4*row2[1] + 2*r23[1] + r31[1] + 2*row3[1] + r33[1])>>4;
252                         cp[2]= (r11[2] + 2*row1[2] + r13[2] + 2*r21[2] + 4*row2[2] + 2*r23[2] + r31[2] + 2*row3[2] + r33[2])>>4;
253                         cp[3]= (r11[3] + 2*row1[3] + r13[3] + 2*r21[3] + 4*row2[3] + 2*r23[3] + r31[3] + 2*row3[3] + r33[3])>>4;
254                         cp+=4; row1+=4; row2+=4; row3+=4;
255                 }
256         }
257 }
258
259 void IMB_filter(struct ImBuf *ibuf)
260 {
261         IMB_filtery(ibuf);
262         imb_filterx(ibuf);
263 }
264
265 #define EXTEND_PIXEL(color, w) if((color)[3]) {r+= w*(color)[0]; g+= w*(color)[1]; b+= w*(color)[2]; a+= w*(color)[3]; tot+=w;}
266
267 /* if alpha is zero, it checks surrounding pixels and averages color. sets new alphas to 1.0
268  * 
269  * When a mask is given, only effect pixels with a mask value of 1, defined as BAKE_MASK_MARGIN in rendercore.c
270  * */
271 void IMB_filter_extend(struct ImBuf *ibuf, char *mask)
272 {
273         register char *row1, *row2, *row3;
274         register char *cp; 
275         int rowlen, x, y;
276         
277         rowlen= ibuf->x;
278         
279         
280         if (ibuf->rect_float) {
281                 float *temprect;
282                 float *row1f, *row2f, *row3f;
283                 float *fp;
284                 temprect= MEM_dupallocN(ibuf->rect_float);
285                 
286                 for(y=1; y<=ibuf->y; y++) {
287                         /* setup rows */
288                         row1f= (float *)(temprect + (y-2)*rowlen*4);
289                         row2f= row1f + 4*rowlen;
290                         row3f= row2f + 4*rowlen;
291                         if(y==1)
292                                 row1f= row2f;
293                         else if(y==ibuf->y)
294                                 row3f= row2f;
295                         
296                         fp= (float *)(ibuf->rect_float + (y-1)*rowlen*4);
297                                 
298                         for(x=0; x<rowlen; x++) {
299                                 if((mask==NULL && fp[3]==0.0f) || (mask && mask[((y-1)*rowlen)+x]==1)) {
300                                         int tot= 0;
301                                         float r=0.0f, g=0.0f, b=0.0f, a=0.0f;
302                                         
303                                         EXTEND_PIXEL(row1f, 1);
304                                         EXTEND_PIXEL(row2f, 2);
305                                         EXTEND_PIXEL(row3f, 1);
306                                         EXTEND_PIXEL(row1f+4, 2);
307                                         EXTEND_PIXEL(row3f+4, 2);
308                                         if(x!=rowlen-1) {
309                                                 EXTEND_PIXEL(row1f+8, 1);
310                                                 EXTEND_PIXEL(row2f+8, 2);
311                                                 EXTEND_PIXEL(row3f+8, 1);
312                                         }                                       
313                                         if(tot) {
314                                                 fp[0]= r/tot;
315                                                 fp[1]= g/tot;
316                                                 fp[2]= b/tot;
317                                                 fp[3]= a/tot;
318                                         }
319                                 }
320                                 fp+=4; 
321                                 
322                                 if(x!=0) {
323                                         row1f+=4; row2f+=4; row3f+=4;
324                                 }
325                         }
326                 }
327
328                 MEM_freeN(temprect);
329         }
330         else if(ibuf->rect) {
331                 int *temprect;
332                 
333                 /* make a copy, to prevent flooding */
334                 temprect= MEM_dupallocN(ibuf->rect);
335                 
336                 for(y=1; y<=ibuf->y; y++) {
337                         /* setup rows */
338                         row1= (char *)(temprect + (y-2)*rowlen);
339                         row2= row1 + 4*rowlen;
340                         row3= row2 + 4*rowlen;
341                         if(y==1)
342                                 row1= row2;
343                         else if(y==ibuf->y)
344                                 row3= row2;
345                         
346                         cp= (char *)(ibuf->rect + (y-1)*rowlen);
347                         
348                         for(x=0; x<rowlen; x++) {
349                                 /*if(cp[3]==0) {*/
350                                 if((mask==NULL && cp[3]==0) || (mask && mask[((y-1)*rowlen)+x]==1)) {
351                                         int tot= 0, r=0, g=0, b=0, a=0;
352                                         
353                                         EXTEND_PIXEL(row1, 1);
354                                         EXTEND_PIXEL(row2, 2);
355                                         EXTEND_PIXEL(row3, 1);
356                                         EXTEND_PIXEL(row1+4, 2);
357                                         EXTEND_PIXEL(row3+4, 2);
358                                         if(x!=rowlen-1) {
359                                                 EXTEND_PIXEL(row1+8, 1);
360                                                 EXTEND_PIXEL(row2+8, 2);
361                                                 EXTEND_PIXEL(row3+8, 1);
362                                         }                                       
363                                         if(tot) {
364                                                 cp[0]= r/tot;
365                                                 cp[1]= g/tot;
366                                                 cp[2]= b/tot;
367                                                 cp[3]= a/tot;
368                                         }
369                                 }
370                                 cp+=4;
371                                 
372                                 if(x!=0) {
373                                         row1+=4; row2+=4; row3+=4;
374                                 }
375                         }
376                 }
377                 
378                 MEM_freeN(temprect);
379         }
380 }
381
382 /* threadsafe version, only recreates existing maps */
383 void IMB_remakemipmap(ImBuf *ibuf, int use_filter)
384 {
385         ImBuf *hbuf = ibuf;
386         int curmap = 0;
387         
388         ibuf->miptot= 1;
389         
390         while(curmap < IB_MIPMAP_LEVELS) {
391                 
392                 if(ibuf->mipmap[curmap]) {
393                         
394                         if(use_filter) {
395                                 ImBuf *nbuf= IMB_allocImBuf(hbuf->x, hbuf->y, 32, IB_rect);
396                                 IMB_filterN(nbuf, hbuf);
397                                 imb_onehalf_no_alloc(ibuf->mipmap[curmap], nbuf);
398                                 IMB_freeImBuf(nbuf);
399                         }
400                         else
401                                 imb_onehalf_no_alloc(ibuf->mipmap[curmap], hbuf);
402                 }
403                 
404                 ibuf->miptot= curmap+2;
405                 hbuf= ibuf->mipmap[curmap];
406                 if(hbuf)
407                         hbuf->miplevel= curmap+1;
408                 
409                 if(!hbuf || (hbuf->x <= 2 && hbuf->y <= 2))
410                         break;
411                 
412                 curmap++;
413         }
414 }
415
416 /* frees too (if there) and recreates new data */
417 void IMB_makemipmap(ImBuf *ibuf, int use_filter)
418 {
419         ImBuf *hbuf = ibuf;
420         int curmap = 0;
421
422         imb_freemipmapImBuf(ibuf);
423         
424         ibuf->miptot= 1;
425
426         while(curmap < IB_MIPMAP_LEVELS) {
427                 if(use_filter) {
428                         ImBuf *nbuf= IMB_allocImBuf(hbuf->x, hbuf->y, 32, IB_rect);
429                         IMB_filterN(nbuf, hbuf);
430                         ibuf->mipmap[curmap] = IMB_onehalf(nbuf);
431                         IMB_freeImBuf(nbuf);
432                 }
433                 else
434                         ibuf->mipmap[curmap] = IMB_onehalf(hbuf);
435
436                 ibuf->miptot= curmap+2;
437                 hbuf= ibuf->mipmap[curmap];
438                 hbuf->miplevel= curmap+1;
439
440                 if(!hbuf || (hbuf->x <= 2 && hbuf->y <= 2))
441                         break;
442
443                 curmap++;
444         }
445 }
446
447 ImBuf *IMB_getmipmap(ImBuf *ibuf, int level)
448 {
449         CLAMP(level, 0, ibuf->miptot-1);
450         return (level == 0)? ibuf: ibuf->mipmap[level-1];
451 }
452
453 void IMB_premultiply_rect(unsigned int *rect, int depth, int w, int h)
454 {
455         char *cp;
456         int x, y, val;
457
458         if(depth == 24) {       /* put alpha at 255 */
459                 cp= (char *)(rect);
460
461                 for(y=0; y<h; y++)
462                         for(x=0; x<w; x++, cp+=4)
463                                 cp[3]= 255;
464         }
465         else {
466                 cp= (char *)(rect);
467
468                 for(y=0; y<h; y++) {
469                         for(x=0; x<w; x++, cp+=4) {
470                                 val= cp[3];
471                                 cp[0]= (cp[0]*val)>>8;
472                                 cp[1]= (cp[1]*val)>>8;
473                                 cp[2]= (cp[2]*val)>>8;
474                         }
475                 }
476         }
477 }
478
479 void IMB_premultiply_rect_float(float *rect_float, int depth, int w, int h)
480 {
481         float val, *cp;
482         int x, y;
483
484         if(depth==24) { /* put alpha at 1.0 */
485                 cp= rect_float;
486
487                 for(y=0; y<h; y++)
488                         for(x=0; x<w; x++, cp+=4)
489                                 cp[3]= 1.0;
490         }
491         else {
492                 cp= rect_float;
493                 for(y=0; y<h; y++) {
494                         for(x=0; x<w; x++, cp+=4) {
495                                 val= cp[3];
496                                 cp[0]= cp[0]*val;
497                                 cp[1]= cp[1]*val;
498                                 cp[2]= cp[2]*val;
499                         }
500                 }
501         }
502
503 }
504
505 void IMB_premultiply_alpha(ImBuf *ibuf)
506 {
507         if(ibuf==NULL)
508                 return;
509
510         if(ibuf->rect)
511                 IMB_premultiply_rect(ibuf->rect, ibuf->depth, ibuf->x, ibuf->y);
512
513         if(ibuf->rect_float)
514                 IMB_premultiply_rect_float(ibuf->rect_float, ibuf->depth, ibuf->x, ibuf->y);
515 }
516