svn merge -r39384:39433 https://svn.blender.org/svnroot/bf-blender/trunk/blender
[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): Morten Mikkelsen.
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 void IMB_mask_filter_extend(char *mask, int width, int height)
266 {
267         char *row1, *row2, *row3;
268         int rowlen, x, y;
269         char *temprect;
270
271         rowlen= width;
272
273         /* make a copy, to prevent flooding */
274         temprect= MEM_dupallocN(mask);
275
276         for(y=1; y<=height; y++) {
277                 /* setup rows */
278                 row1= (char *)(temprect + (y-2)*rowlen);
279                 row2= row1 + rowlen;
280                 row3= row2 + rowlen;
281                 if(y==1)
282                         row1= row2;
283                 else if(y==height)
284                         row3= row2;
285
286                 for(x=0; x<rowlen; x++) {
287                         if (mask[((y-1)*rowlen)+x]==0) {
288                                 if (*row1 || *row2 || *row3 || *(row1+1) || *(row3+1) ) {
289                                         mask[((y-1)*rowlen)+x] = FILTER_MASK_MARGIN;
290                                 } else if((x!=rowlen-1) && (*(row1+2) || *(row2+2) || *(row3+2)) ) {
291                                         mask[((y-1)*rowlen)+x] = FILTER_MASK_MARGIN;
292                                 }
293                         }
294
295                         if(x!=0) {
296                                 row1++; row2++; row3++;
297                         }
298                 }
299         }
300
301         MEM_freeN(temprect);
302 }
303
304 void IMB_mask_clear(ImBuf *ibuf, char *mask, int val)
305 {
306         int x,y;
307         if (ibuf->rect_float) {
308                 for(x=0; x<ibuf->x; x++) {
309                         for(y=0; y<ibuf->y; y++) {
310                                 if (mask[ibuf->x*y + x] == val) {
311                                         float *col= ibuf->rect_float + 4*(ibuf->x*y + x);
312                                         col[0] = col[1] = col[2] = col[3] = 0.0f;
313                                 }
314                         }
315                 }
316         } else {
317                 /* char buffer */
318                 for(x=0; x<ibuf->x; x++) {
319                         for(y=0; y<ibuf->y; y++) {
320                                 if (mask[ibuf->x*y + x] == val) {
321                                         char *col= (char *)(ibuf->rect + ibuf->x*y + x);
322                                         col[0] = col[1] = col[2] = col[3] = 0;
323                                 }
324                         }
325                 }
326         }
327 }
328
329 static int filter_make_index(const int x, const int y, const int w, const int h)
330 {
331         if(x<0 || x>=w || y<0 || y>=h) return -1;       /* return bad index */
332         else return y*w+x;
333 }
334
335 static int check_pixel_assigned(const void *buffer, const char *mask, const int index, const int depth, const int is_float)
336 {
337         int res = 0;
338
339         if(index>=0) {
340                 const int alpha_index = depth*index+(depth-1);
341
342                 if(mask!=NULL) {
343                         res = mask[index]!=0 ? 1 : 0;
344                 }
345                 else if( (is_float && ((const float *) buffer)[alpha_index]!=0.0f) ||
346                                 (!is_float && ((const unsigned char *) buffer)[alpha_index]!=0) ) {
347                         res=1;
348                 }
349         }
350
351         return res;
352 }
353
354 /* if alpha is zero, it checks surrounding pixels and averages color. sets new alphas to 1.0
355  * 
356  * When a mask is given, only effect pixels with a mask value of 1, defined as BAKE_MASK_MARGIN in rendercore.c
357  * */
358 void IMB_filter_extend(struct ImBuf *ibuf, char *mask, int filter)
359 {
360         const int width= ibuf->x;
361         const int height= ibuf->y;
362         const int depth= 4;             /* always 4 channels */
363         const int chsize= ibuf->rect_float ? sizeof(float) : sizeof(unsigned char);
364         const int bsize= width*height*depth*chsize;
365         const int is_float= ibuf->rect_float!=NULL;
366         void *dstbuf= (void *) MEM_dupallocN(ibuf->rect_float ? (void *) ibuf->rect_float : (void *) ibuf->rect);
367         char *dstmask= mask==NULL ? NULL : (char *) MEM_dupallocN(mask);
368         void *srcbuf= ibuf->rect_float ? (void *) ibuf->rect_float : (void *) ibuf->rect;
369         char *srcmask= mask;
370         int cannot_early_out= 1, r, n, k, i, j, c;
371         float weight[25];
372
373         /* build a weights buffer */
374         n= 1;
375         /*k= 0;
376         for(i = -n; i <= n; i++)
377                 for(j = -n; j <= n; j++)
378                         weight[k++] = sqrt((float) i * i + j * j);
379                         */
380         weight[0]=1; weight[1]=2; weight[2]=1;
381         weight[3]=2; weight[4]=0; weight[5]=2;
382         weight[6]=1; weight[7]=2; weight[8]=1;
383
384         /* run passes */
385         for(r = 0; cannot_early_out == 1 && r < filter; r++) {
386                 int x, y;
387                 cannot_early_out = 0;
388
389                 for(y= 0; y<height; y++) {
390                         for(x= 0; x<width; x++) {
391                                 const int index= filter_make_index(x, y, width, height);
392
393                                 /* only update unassigned pixels */
394                                 if(!check_pixel_assigned(srcbuf, srcmask, index, depth, is_float)) {
395                                         float tmp[4];
396                                         float wsum=0;
397                                         float acc[4]={0,0,0,0};
398                                         k = 0;
399
400                                         /*if (check_pixel_assigned(srcbuf, srcmask, filter_make_index(x-1, y, width, height), depth, is_float) ||
401                                                 check_pixel_assigned(srcbuf, srcmask, filter_make_index(x+1, y, width, height), depth, is_float) ||
402                                                 check_pixel_assigned(srcbuf, srcmask, filter_make_index(x, y-1, width, height), depth, is_float) ||
403                                                 check_pixel_assigned(srcbuf, srcmask, filter_make_index(x, y+1, width, height), depth, is_float))*/ {
404                                                 for(i= -n; i<=n; i++) {
405                                                         for(j=-n; j<=n; j++) {
406                                                                 if(i != 0 || j != 0) {
407                                                                         const int tmpindex= filter_make_index(x+i, y+j, width, height);
408
409                                                                         if(check_pixel_assigned(srcbuf, srcmask, tmpindex, depth, is_float))    { 
410                                                                                 if(is_float) {
411                                                                                         for(c=0; c<depth; c++)
412                                                                                                 tmp[c] = ((const float *) srcbuf)[depth*tmpindex+c];
413                                                                                 }
414                                                                                 else {
415                                                                                         for(c=0; c<depth; c++)
416                                                                                                 tmp[c] = (float) ((const unsigned char *) srcbuf)[depth*tmpindex+c];
417                                                                                 }
418
419                                                                                 wsum+= weight[k];
420
421                                                                                 for(c=0; c<depth; c++)
422                                                                                         acc[c]+= weight[k] * tmp[c];
423                                                                         }
424                                                                 }
425                                                                 k++;
426                                                         }
427                                                 }
428
429                                                 if(wsum!=0) {
430                                                         for(c=0; c<depth; c++)
431                                                                 acc[c]/= wsum;
432
433                                                         if(is_float) {
434                                                                 for(c=0; c<depth; c++)
435                                                                         ((float *) dstbuf)[depth*index+c] = acc[c];
436                                                         }
437                                                         else {
438                                                                 for(c=0; c<depth; c++) {
439                                                                         ((unsigned char *) dstbuf)[depth*index+c]= acc[c] > 255 ? 255 : (acc[c] < 0 ? 0 : ((unsigned char) (acc[c]+0.5f)));
440                                                                 }
441                                                         }
442
443                                                         if(dstmask!=NULL) dstmask[index]=FILTER_MASK_MARGIN;    /* assigned */
444                                                         cannot_early_out = 1;
445                                                 }
446                                         }
447                                 }
448                         }
449                 }
450
451                 /* keep the original buffer up to date. */
452                 memcpy(srcbuf, dstbuf, bsize);
453                 if(dstmask!=NULL) memcpy(srcmask, dstmask, width*height);
454         }
455
456         /* free memory */
457         MEM_freeN(dstbuf);
458         if(dstmask!=NULL) MEM_freeN(dstmask);
459 }
460
461 /* threadsafe version, only recreates existing maps */
462 void IMB_remakemipmap(ImBuf *ibuf, int use_filter)
463 {
464         ImBuf *hbuf = ibuf;
465         int curmap = 0;
466         
467         ibuf->miptot= 1;
468         
469         while(curmap < IB_MIPMAP_LEVELS) {
470                 
471                 if(ibuf->mipmap[curmap]) {
472                         
473                         if(use_filter) {
474                                 ImBuf *nbuf= IMB_allocImBuf(hbuf->x, hbuf->y, 32, IB_rect);
475                                 IMB_filterN(nbuf, hbuf);
476                                 imb_onehalf_no_alloc(ibuf->mipmap[curmap], nbuf);
477                                 IMB_freeImBuf(nbuf);
478                         }
479                         else
480                                 imb_onehalf_no_alloc(ibuf->mipmap[curmap], hbuf);
481                 }
482                 
483                 ibuf->miptot= curmap+2;
484                 hbuf= ibuf->mipmap[curmap];
485                 if(hbuf)
486                         hbuf->miplevel= curmap+1;
487                 
488                 if(!hbuf || (hbuf->x <= 2 && hbuf->y <= 2))
489                         break;
490                 
491                 curmap++;
492         }
493 }
494
495 /* frees too (if there) and recreates new data */
496 void IMB_makemipmap(ImBuf *ibuf, int use_filter)
497 {
498         ImBuf *hbuf = ibuf;
499         int curmap = 0;
500
501         imb_freemipmapImBuf(ibuf);
502         
503         ibuf->miptot= 1;
504
505         while(curmap < IB_MIPMAP_LEVELS) {
506                 if(use_filter) {
507                         ImBuf *nbuf= IMB_allocImBuf(hbuf->x, hbuf->y, 32, IB_rect);
508                         IMB_filterN(nbuf, hbuf);
509                         ibuf->mipmap[curmap] = IMB_onehalf(nbuf);
510                         IMB_freeImBuf(nbuf);
511                 }
512                 else
513                         ibuf->mipmap[curmap] = IMB_onehalf(hbuf);
514
515                 ibuf->miptot= curmap+2;
516                 hbuf= ibuf->mipmap[curmap];
517                 hbuf->miplevel= curmap+1;
518
519                 if(!hbuf || (hbuf->x <= 2 && hbuf->y <= 2))
520                         break;
521
522                 curmap++;
523         }
524 }
525
526 ImBuf *IMB_getmipmap(ImBuf *ibuf, int level)
527 {
528         CLAMP(level, 0, ibuf->miptot-1);
529         return (level == 0)? ibuf: ibuf->mipmap[level-1];
530 }
531
532 void IMB_premultiply_rect(unsigned int *rect, int depth, int w, int h)
533 {
534         char *cp;
535         int x, y, val;
536
537         if(depth == 24) {       /* put alpha at 255 */
538                 cp= (char *)(rect);
539
540                 for(y=0; y<h; y++)
541                         for(x=0; x<w; x++, cp+=4)
542                                 cp[3]= 255;
543         }
544         else {
545                 cp= (char *)(rect);
546
547                 for(y=0; y<h; y++) {
548                         for(x=0; x<w; x++, cp+=4) {
549                                 val= cp[3];
550                                 cp[0]= (cp[0]*val)>>8;
551                                 cp[1]= (cp[1]*val)>>8;
552                                 cp[2]= (cp[2]*val)>>8;
553                         }
554                 }
555         }
556 }
557
558 void IMB_premultiply_rect_float(float *rect_float, int depth, int w, int h)
559 {
560         float val, *cp;
561         int x, y;
562
563         if(depth==24) { /* put alpha at 1.0 */
564                 cp= rect_float;
565
566                 for(y=0; y<h; y++)
567                         for(x=0; x<w; x++, cp+=4)
568                                 cp[3]= 1.0;
569         }
570         else {
571                 cp= rect_float;
572                 for(y=0; y<h; y++) {
573                         for(x=0; x<w; x++, cp+=4) {
574                                 val= cp[3];
575                                 cp[0]= cp[0]*val;
576                                 cp[1]= cp[1]*val;
577                                 cp[2]= cp[2]*val;
578                         }
579                 }
580         }
581
582 }
583
584 void IMB_premultiply_alpha(ImBuf *ibuf)
585 {
586         if(ibuf==NULL)
587                 return;
588
589         if(ibuf->rect)
590                 IMB_premultiply_rect(ibuf->rect, ibuf->depth, ibuf->x, ibuf->y);
591
592         if(ibuf->rect_float)
593                 IMB_premultiply_rect_float(ibuf->rect_float, ibuf->depth, ibuf->x, ibuf->y);
594 }
595