svn merge ^/trunk/blender -r43381:43392
[blender.git] / source / blender / blenkernel / intern / brush.c
1 /*
2  * ***** BEGIN GPL LICENSE BLOCK *****
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version 2
7  * of the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software Foundation,
16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17  *
18  * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
19  * All rights reserved.
20  *
21  * The Original Code is: all of this file.
22  *
23  * Contributor(s): none yet.
24  *
25  * ***** END GPL LICENSE BLOCK *****
26  */
27
28 /** \file blender/blenkernel/intern/brush.c
29  *  \ingroup bke
30  */
31
32
33 #include <math.h>
34 #include <string.h>
35
36 #include "MEM_guardedalloc.h"
37
38 #include "DNA_brush_types.h"
39 #include "DNA_color_types.h"
40 #include "DNA_scene_types.h"
41 #include "DNA_object_types.h"
42 #include "DNA_windowmanager_types.h"
43
44 #include "WM_types.h"
45
46 #include "RNA_access.h"
47
48 #include "BLI_bpath.h"
49 #include "BLI_math.h"
50 #include "BLI_blenlib.h"
51 #include "BLI_rand.h"
52 #include "BLI_utildefines.h"
53
54 #include "BKE_brush.h"
55 #include "BKE_colortools.h"
56 #include "BKE_global.h"
57 #include "BKE_image.h"
58 #include "BKE_library.h"
59 #include "BKE_main.h"
60 #include "BKE_paint.h"
61 #include "BKE_texture.h"
62 #include "BKE_icons.h"
63
64 #include "IMB_imbuf.h"
65 #include "IMB_imbuf_types.h"
66
67 #include "RE_render_ext.h" /* externtex */
68 #include "RE_shader_ext.h"
69
70 static void brush_set_defaults(Brush *brush)
71 {
72         brush->blend = 0;
73         brush->flag = 0;
74
75         brush->ob_mode = OB_MODE_ALL_PAINT;
76
77         /* BRUSH SCULPT TOOL SETTINGS */
78         brush->size= 35; /* radius of the brush in pixels */
79         brush->alpha= 0.5f; /* brush strength/intensity probably variable should be renamed? */
80         brush->autosmooth_factor= 0.0f;
81         brush->crease_pinch_factor= 0.5f;
82         brush->sculpt_plane = SCULPT_DISP_DIR_AREA;
83         brush->plane_offset= 0.0f; /* how far above or below the plane that is found by averaging the faces */
84         brush->plane_trim= 0.5f;
85         brush->clone.alpha= 0.5f;
86         brush->normal_weight= 0.0f;
87         brush->flag |= BRUSH_ALPHA_PRESSURE;
88
89         /* BRUSH PAINT TOOL SETTINGS */
90         brush->rgb[0]= 1.0f; /* default rgb color of the brush when painting - white */
91         brush->rgb[1]= 1.0f;
92         brush->rgb[2]= 1.0f;
93
94         /* BRUSH STROKE SETTINGS */
95         brush->flag |= (BRUSH_SPACE|BRUSH_SPACE_ATTEN);
96         brush->spacing= 10; /* how far each brush dot should be spaced as a percentage of brush diameter */
97
98         brush->smooth_stroke_radius= 75;
99         brush->smooth_stroke_factor= 0.9f;
100
101         brush->rate= 0.1f; /* time delay between dots of paint or sculpting when doing airbrush mode */
102
103         brush->jitter= 0.0f;
104
105         /* BRUSH TEXTURE SETTINGS */
106         default_mtex(&brush->mtex);
107
108         brush->texture_sample_bias= 0; /* value to added to texture samples */
109         brush->texture_overlay_alpha= 33;
110
111         /* brush appearance  */
112
113         brush->add_col[0]= 1.00; /* add mode color is light red */
114         brush->add_col[1]= 0.39;
115         brush->add_col[2]= 0.39;
116
117         brush->sub_col[0]= 0.39; /* subtract mode color is light blue */
118         brush->sub_col[1]= 0.39;
119         brush->sub_col[2]= 1.00;
120 }
121
122 /* Datablock add/copy/free/make_local */
123
124 Brush *add_brush(const char *name)
125 {
126         Brush *brush;
127
128         brush= alloc_libblock(&G.main->brush, ID_BR, name);
129
130         /* enable fake user by default */
131         brush->id.flag |= LIB_FAKEUSER;
132
133         brush_set_defaults(brush);
134
135         brush->sculpt_tool = SCULPT_TOOL_DRAW; /* sculpting defaults to the draw tool for new brushes */
136
137          /* the default alpha falloff curve */
138         brush_curve_preset(brush, CURVE_PRESET_SMOOTH);
139
140         return brush;
141 }
142
143 Brush *copy_brush(Brush *brush)
144 {
145         Brush *brushn;
146         
147         brushn= copy_libblock(&brush->id);
148
149         if (brush->mtex.tex)
150                 id_us_plus((ID*)brush->mtex.tex);
151
152         if (brush->icon_imbuf)
153                 brushn->icon_imbuf= IMB_dupImBuf(brush->icon_imbuf);
154
155         brushn->preview = NULL;
156
157         brushn->curve= curvemapping_copy(brush->curve);
158
159         /* enable fake user by default */
160         if (!(brushn->id.flag & LIB_FAKEUSER)) {
161                 brushn->id.flag |= LIB_FAKEUSER;
162                 brushn->id.us++;
163         }
164         
165         return brushn;
166 }
167
168 /* not brush itself */
169 void free_brush(Brush *brush)
170 {
171         if (brush->mtex.tex)
172                 brush->mtex.tex->id.us--;
173
174         if (brush->icon_imbuf)
175                 IMB_freeImBuf(brush->icon_imbuf);
176
177         BKE_previewimg_free(&(brush->preview));
178
179         curvemapping_free(brush->curve);
180 }
181
182 static void extern_local_brush(Brush *brush)
183 {
184         id_lib_extern((ID *)brush->mtex.tex);
185         id_lib_extern((ID *)brush->clone.image);
186 }
187
188 void make_local_brush(Brush *brush)
189 {
190
191         /* - only lib users: do nothing
192          * - only local users: set flag
193          * - mixed: make copy
194          */
195
196         Main *bmain= G.main;
197         Scene *scene;
198         int is_local= FALSE, is_lib= FALSE;
199
200         if(brush->id.lib==NULL) return;
201
202         if(brush->clone.image) {
203                 /* special case: ima always local immediately. Clone image should only
204                    have one user anyway. */
205                 id_clear_lib_data(bmain, &brush->clone.image->id);
206                 extern_local_brush(brush);
207         }
208
209         for(scene= bmain->scene.first; scene && ELEM(0, is_lib, is_local); scene=scene->id.next) {
210                 if(paint_brush(&scene->toolsettings->imapaint.paint)==brush) {
211                         if(scene->id.lib) is_lib= TRUE;
212                         else is_local= TRUE;
213                 }
214         }
215
216         if(is_local && is_lib == FALSE) {
217                 id_clear_lib_data(bmain, &brush->id);
218                 extern_local_brush(brush);
219
220                 /* enable fake user by default */
221                 if (!(brush->id.flag & LIB_FAKEUSER)) {
222                         brush->id.flag |= LIB_FAKEUSER;
223                         brush->id.us++;
224                 }
225         }
226         else if(is_local && is_lib) {
227                 Brush *brush_new= copy_brush(brush);
228                 brush_new->id.us= 1; /* only keep fake user */
229                 brush_new->id.flag |= LIB_FAKEUSER;
230
231                 /* Remap paths of new ID using old library as base. */
232                 BKE_id_lib_local_paths(bmain, brush->id.lib, &brush_new->id);
233                 
234                 for(scene= bmain->scene.first; scene; scene=scene->id.next) {
235                         if(paint_brush(&scene->toolsettings->imapaint.paint)==brush) {
236                                 if(scene->id.lib==NULL) {
237                                         paint_brush_set(&scene->toolsettings->imapaint.paint, brush_new);
238                                 }
239                         }
240                 }
241         }
242 }
243
244 void brush_debug_print_state(Brush *br)
245 {
246         /* create a fake brush and set it to the defaults */
247         Brush def= {{NULL}};
248         brush_set_defaults(&def);
249         
250 #define BR_TEST(field, t)                                       \
251         if(br->field != def.field)                              \
252                 printf("br->" #field " = %" #t ";\n", br->field)
253
254 #define BR_TEST_FLAG(_f)                                \
255         if((br->flag & _f) && !(def.flag & _f))         \
256                 printf("br->flag |= " #_f ";\n");       \
257         else if(!(br->flag & _f) && (def.flag & _f))    \
258                 printf("br->flag &= ~" #_f ";\n")
259         
260
261         /* print out any non-default brush state */
262         BR_TEST(normal_weight, f);
263
264         BR_TEST(blend, d);
265         BR_TEST(size, d);
266
267         /* br->flag */
268         BR_TEST_FLAG(BRUSH_AIRBRUSH);
269         BR_TEST_FLAG(BRUSH_TORUS);
270         BR_TEST_FLAG(BRUSH_ALPHA_PRESSURE);
271         BR_TEST_FLAG(BRUSH_SIZE_PRESSURE);
272         BR_TEST_FLAG(BRUSH_JITTER_PRESSURE);
273         BR_TEST_FLAG(BRUSH_SPACING_PRESSURE);
274         BR_TEST_FLAG(BRUSH_FIXED_TEX);
275         BR_TEST_FLAG(BRUSH_RAKE);
276         BR_TEST_FLAG(BRUSH_ANCHORED);
277         BR_TEST_FLAG(BRUSH_DIR_IN);
278         BR_TEST_FLAG(BRUSH_SPACE);
279         BR_TEST_FLAG(BRUSH_SMOOTH_STROKE);
280         BR_TEST_FLAG(BRUSH_PERSISTENT);
281         BR_TEST_FLAG(BRUSH_ACCUMULATE);
282         BR_TEST_FLAG(BRUSH_LOCK_ALPHA);
283         BR_TEST_FLAG(BRUSH_ORIGINAL_NORMAL);
284         BR_TEST_FLAG(BRUSH_OFFSET_PRESSURE);
285         BR_TEST_FLAG(BRUSH_SPACE_ATTEN);
286         BR_TEST_FLAG(BRUSH_ADAPTIVE_SPACE);
287         BR_TEST_FLAG(BRUSH_LOCK_SIZE);
288         BR_TEST_FLAG(BRUSH_TEXTURE_OVERLAY);
289         BR_TEST_FLAG(BRUSH_EDGE_TO_EDGE);
290         BR_TEST_FLAG(BRUSH_RESTORE_MESH);
291         BR_TEST_FLAG(BRUSH_INVERSE_SMOOTH_PRESSURE);
292         BR_TEST_FLAG(BRUSH_RANDOM_ROTATION);
293         BR_TEST_FLAG(BRUSH_PLANE_TRIM);
294         BR_TEST_FLAG(BRUSH_FRONTFACE);
295         BR_TEST_FLAG(BRUSH_CUSTOM_ICON);
296
297         BR_TEST(jitter, f);
298         BR_TEST(spacing, d);
299         BR_TEST(smooth_stroke_radius, d);
300         BR_TEST(smooth_stroke_factor, f);
301         BR_TEST(rate, f);
302
303         BR_TEST(alpha, f);
304
305         BR_TEST(sculpt_plane, d);
306
307         BR_TEST(plane_offset, f);
308
309         BR_TEST(autosmooth_factor, f);
310
311         BR_TEST(crease_pinch_factor, f);
312
313         BR_TEST(plane_trim, f);
314
315         BR_TEST(texture_sample_bias, f);
316         BR_TEST(texture_overlay_alpha, d);
317
318         BR_TEST(add_col[0], f);
319         BR_TEST(add_col[1], f);
320         BR_TEST(add_col[2], f);
321         BR_TEST(sub_col[0], f);
322         BR_TEST(sub_col[1], f);
323         BR_TEST(sub_col[2], f);
324
325         printf("\n");
326         
327 #undef BR_TEST
328 #undef BR_TEST_FLAG
329 }
330
331 void brush_reset_sculpt(Brush *br)
332 {
333         /* enable this to see any non-default
334            settings used by a brush:
335
336         brush_debug_print_state(br);
337         */
338
339         brush_set_defaults(br);
340         brush_curve_preset(br, CURVE_PRESET_SMOOTH);
341
342         switch(br->sculpt_tool) {
343         case SCULPT_TOOL_CLAY:
344                 br->flag |= BRUSH_FRONTFACE;
345                 break;
346         case SCULPT_TOOL_CREASE:
347                 br->flag |= BRUSH_DIR_IN;
348                 br->alpha = 0.25;
349                 break;
350         case SCULPT_TOOL_FILL:
351                 br->add_col[1] = 1;
352                 br->sub_col[0] = 0.25;
353                 br->sub_col[1] = 1;
354                 break;
355         case SCULPT_TOOL_FLATTEN:
356                 br->add_col[1] = 1;
357                 br->sub_col[0] = 0.25;
358                 br->sub_col[1] = 1;
359                 break;
360         case SCULPT_TOOL_INFLATE:
361                 br->add_col[0] = 0.750000;
362                 br->add_col[1] = 0.750000;
363                 br->add_col[2] = 0.750000;
364                 br->sub_col[0] = 0.250000;
365                 br->sub_col[1] = 0.250000;
366                 br->sub_col[2] = 0.250000;
367                 break;
368         case SCULPT_TOOL_NUDGE:
369                 br->add_col[0] = 0.250000;
370                 br->add_col[1] = 1.000000;
371                 br->add_col[2] = 0.250000;
372                 break;
373         case SCULPT_TOOL_PINCH:
374                 br->add_col[0] = 0.750000;
375                 br->add_col[1] = 0.750000;
376                 br->add_col[2] = 0.750000;
377                 br->sub_col[0] = 0.250000;
378                 br->sub_col[1] = 0.250000;
379                 br->sub_col[2] = 0.250000;
380                 break;
381         case SCULPT_TOOL_SCRAPE:
382                 br->add_col[1] = 1.000000;
383                 br->sub_col[0] = 0.250000;
384                 br->sub_col[1] = 1.000000;
385                 break;
386         case SCULPT_TOOL_ROTATE:
387                 br->alpha = 1.0;
388                 break;
389         case SCULPT_TOOL_SMOOTH:
390                 br->flag &= ~BRUSH_SPACE_ATTEN;
391                 br->spacing = 5;
392                 br->add_col[0] = 0.750000;
393                 br->add_col[1] = 0.750000;
394                 br->add_col[2] = 0.750000;
395                 break;
396         case SCULPT_TOOL_GRAB:
397         case SCULPT_TOOL_SNAKE_HOOK:
398         case SCULPT_TOOL_THUMB:
399                 br->size = 75;
400                 br->flag &= ~BRUSH_ALPHA_PRESSURE;
401                 br->flag &= ~BRUSH_SPACE;
402                 br->flag &= ~BRUSH_SPACE_ATTEN;
403                 br->add_col[0] = 0.250000;
404                 br->add_col[1] = 1.000000;
405                 br->add_col[2] = 0.250000;
406                 break;
407         default:
408                 break;
409         }
410 }
411
412 /* Library Operations */
413 void brush_curve_preset(Brush *b, /*CurveMappingPreset*/int preset)
414 {
415         CurveMap *cm = NULL;
416
417         if(!b->curve)
418                 b->curve = curvemapping_add(1, 0, 0, 1, 1);
419
420         cm = b->curve->cm;
421         cm->flag &= ~CUMA_EXTEND_EXTRAPOLATE;
422
423         b->curve->preset = preset;
424         curvemap_reset(cm, &b->curve->clipr, b->curve->preset, CURVEMAP_SLOPE_NEGATIVE);
425         curvemapping_changed(b->curve, 0);
426 }
427
428 int brush_texture_set_nr(Brush *brush, int nr)
429 {
430         ID *idtest, *id=NULL;
431
432         id= (ID *)brush->mtex.tex;
433
434         idtest= (ID*)BLI_findlink(&G.main->tex, nr-1);
435         if(idtest==NULL) { /* new tex */
436                 if(id) idtest= (ID *)copy_texture((Tex *)id);
437                 else idtest= (ID *)add_texture("Tex");
438                 idtest->us--;
439         }
440         if(idtest!=id) {
441                 brush_texture_delete(brush);
442
443                 brush->mtex.tex= (Tex*)idtest;
444                 id_us_plus(idtest);
445
446                 return 1;
447         }
448
449         return 0;
450 }
451
452 int brush_texture_delete(Brush *brush)
453 {
454         if(brush->mtex.tex)
455                 brush->mtex.tex->id.us--;
456
457         return 1;
458 }
459
460 int brush_clone_image_set_nr(Brush *brush, int nr)
461 {
462         if(brush && nr > 0) {
463                 Image *ima= (Image*)BLI_findlink(&G.main->image, nr-1);
464
465                 if(ima) {
466                         brush_clone_image_delete(brush);
467                         brush->clone.image= ima;
468                         id_us_plus(&ima->id);
469                         brush->clone.offset[0]= brush->clone.offset[1]= 0.0f;
470
471                         return 1;
472                 }
473         }
474
475         return 0;
476 }
477
478 int brush_clone_image_delete(Brush *brush)
479 {
480         if (brush && brush->clone.image) {
481                 brush->clone.image->id.us--;
482                 brush->clone.image= NULL;
483                 return 1;
484         }
485
486         return 0;
487 }
488
489 /* Brush Sampling */
490 void brush_sample_tex(const Scene *scene, Brush *brush, const float xy[2], float rgba[4], const int thread)
491 {
492         MTex *mtex= &brush->mtex;
493
494         if (mtex && mtex->tex) {
495                 float co[3], tin, tr, tg, tb, ta;
496                 int hasrgb;
497                 const int radius= brush_size(scene, brush);
498
499                 co[0]= xy[0]/radius;
500                 co[1]= xy[1]/radius;
501                 co[2]= 0.0f;
502
503                 hasrgb= externtex(mtex, co, &tin, &tr, &tg, &tb, &ta, thread);
504
505                 if (hasrgb) {
506                         rgba[0]= tr;
507                         rgba[1]= tg;
508                         rgba[2]= tb;
509                         rgba[3]= ta;
510                 }
511                 else {
512                         rgba[0]= tin;
513                         rgba[1]= tin;
514                         rgba[2]= tin;
515                         rgba[3]= 1.0f;
516                 }
517         }
518         else {
519                 rgba[0]= rgba[1]= rgba[2]= rgba[3]= 1.0f;
520         }
521 }
522
523 /* TODO, use define for 'texfall' arg */
524 void brush_imbuf_new(const Scene *scene, Brush *brush, short flt, short texfall, int bufsize, ImBuf **outbuf, int use_color_correction)
525 {
526         ImBuf *ibuf;
527         float xy[2], rgba[4], *dstf;
528         int x, y, rowbytes, xoff, yoff, imbflag;
529         const int radius= brush_size(scene, brush);
530         char *dst, crgb[3];
531         const float alpha= brush_alpha(scene, brush);
532         float brush_rgb[3];
533     
534         imbflag= (flt)? IB_rectfloat: IB_rect;
535         xoff = -bufsize/2.0f + 0.5f;
536         yoff = -bufsize/2.0f + 0.5f;
537         rowbytes= bufsize*4;
538
539         if (*outbuf)
540                 ibuf= *outbuf;
541         else
542                 ibuf= IMB_allocImBuf(bufsize, bufsize, 32, imbflag);
543
544         if (flt) {
545                 copy_v3_v3(brush_rgb, brush->rgb);
546                 if(use_color_correction){
547                         srgb_to_linearrgb_v3_v3(brush_rgb, brush_rgb);
548                 }
549
550                 for (y=0; y < ibuf->y; y++) {
551                         dstf = ibuf->rect_float + y*rowbytes;
552
553                         for (x=0; x < ibuf->x; x++, dstf+=4) {
554                                 xy[0] = x + xoff;
555                                 xy[1] = y + yoff;
556
557                                 if (texfall == 0) {
558                                         copy_v3_v3(dstf, brush_rgb);
559                                         dstf[3]= alpha*brush_curve_strength_clamp(brush, len_v2(xy), radius);
560                                 }
561                                 else if (texfall == 1) {
562                                         brush_sample_tex(scene, brush, xy, dstf, 0);
563                                 }
564                                 else {
565                                         brush_sample_tex(scene, brush, xy, rgba, 0);
566                                         mul_v3_v3v3(dstf, rgba, brush_rgb);
567                                         dstf[3] = rgba[3]*alpha*brush_curve_strength_clamp(brush, len_v2(xy), radius);
568                                 }
569                         }
570                 }
571         }
572         else {
573                 float alpha_f; /* final float alpha to convert to char */
574                 F3TOCHAR3(brush->rgb, crgb);
575
576                 for (y=0; y < ibuf->y; y++) {
577                         dst = (char*)ibuf->rect + y*rowbytes;
578
579                         for (x=0; x < ibuf->x; x++, dst+=4) {
580                                 xy[0] = x + xoff;
581                                 xy[1] = y + yoff;
582
583                                 if (texfall == 0) {
584                                         alpha_f = alpha * brush_curve_strength(brush, len_v2(xy), radius);
585
586                                         dst[0] = crgb[0];
587                                         dst[1] = crgb[1];
588                                         dst[2] = crgb[2];
589                                         dst[3] = FTOCHAR(alpha_f);
590                                 }
591                                 else if (texfall == 1) {
592                                         brush_sample_tex(scene, brush, xy, rgba, 0);
593                                         dst[0] = FTOCHAR(rgba[0]);
594                                         dst[1] = FTOCHAR(rgba[1]);
595                                         dst[2] = FTOCHAR(rgba[2]);
596                                         dst[3] = FTOCHAR(rgba[3]);
597                                 }
598                                 else if (texfall == 2) {
599                                         brush_sample_tex(scene, brush, xy, rgba, 0);
600                                         mul_v3_v3(rgba, brush->rgb);
601                                         alpha_f = rgba[3] * alpha * brush_curve_strength_clamp(brush, len_v2(xy), radius);
602
603                                         dst[0] = FTOCHAR(rgba[0]);
604                                         dst[1] = FTOCHAR(rgba[1]);
605                                         dst[2] = FTOCHAR(rgba[2]);
606                                         dst[3] = FTOCHAR(alpha_f);
607                                 }
608                                 else {
609                                         brush_sample_tex(scene, brush, xy, rgba, 0);
610                                         alpha_f = rgba[3] * alpha * brush_curve_strength_clamp(brush, len_v2(xy), radius);
611
612                                         dst[0] = crgb[0];
613                                         dst[1] = crgb[1];
614                                         dst[2] = crgb[2];
615                                         dst[3] = FTOCHAR(alpha_f);
616                                 }
617                         }
618                 }
619         }
620
621         *outbuf= ibuf;
622 }
623
624 /* Unified Size and Strength */
625
626 // XXX: be careful about setting size and unprojected radius
627 // because they depend on one another
628 // these functions do not set the other corresponding value
629 // this can lead to odd behavior if size and unprojected
630 // radius become inconsistent.
631 // the biggest problem is that it isn't possible to change
632 // unprojected radius because a view context is not
633 // available.  my ussual solution to this is to use the
634 // ratio of change of the size to change the unprojected
635 // radius.  Not completely convinced that is correct.
636 // In anycase, a better solution is needed to prevent
637 // inconsistency.
638
639 void brush_set_size(Scene *scene, Brush *brush, int size)
640 {
641         UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
642
643         if (ups->flag & UNIFIED_PAINT_SIZE)
644                 ups->size= size;
645         else
646                 brush->size= size;
647 }
648
649 int brush_size(const Scene *scene, Brush *brush)
650 {
651         UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
652
653         return (ups->flag & UNIFIED_PAINT_SIZE) ? ups->size : brush->size;
654 }
655
656 int brush_use_locked_size(const Scene *scene, Brush *brush)
657 {
658         const short us_flag = scene->toolsettings->unified_paint_settings.flag;
659
660         return (us_flag & UNIFIED_PAINT_SIZE) ?
661                 (us_flag & UNIFIED_PAINT_BRUSH_LOCK_SIZE) :
662                 (brush->flag & BRUSH_LOCK_SIZE);
663 }
664
665 int brush_use_size_pressure(const Scene *scene, Brush *brush)
666 {
667         const short us_flag = scene->toolsettings->unified_paint_settings.flag;
668
669         return (us_flag & UNIFIED_PAINT_SIZE) ?
670                 (us_flag & UNIFIED_PAINT_BRUSH_SIZE_PRESSURE) :
671                 (brush->flag & BRUSH_SIZE_PRESSURE);
672 }
673
674 int brush_use_alpha_pressure(const Scene *scene, Brush *brush)
675 {
676         const short us_flag = scene->toolsettings->unified_paint_settings.flag;
677
678         return (us_flag & UNIFIED_PAINT_ALPHA) ?
679                 (us_flag & UNIFIED_PAINT_BRUSH_ALPHA_PRESSURE) :
680                 (brush->flag & BRUSH_ALPHA_PRESSURE);
681 }
682
683 void brush_set_unprojected_radius(Scene *scene, Brush *brush, float unprojected_radius)
684 {
685         UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
686
687         if (ups->flag & UNIFIED_PAINT_SIZE)
688                 ups->unprojected_radius= unprojected_radius;
689         else
690                 brush->unprojected_radius= unprojected_radius;
691 }
692
693 float brush_unprojected_radius(const Scene *scene, Brush *brush)
694 {
695         UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
696
697         return (ups->flag & UNIFIED_PAINT_SIZE) ?
698                 ups->unprojected_radius :
699                 brush->unprojected_radius;
700 }
701
702 static void brush_set_alpha(Scene *scene, Brush *brush, float alpha)
703 {
704         UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
705
706         if (ups->flag & UNIFIED_PAINT_ALPHA)
707                 ups->alpha= alpha;
708         else
709                 brush->alpha= alpha;
710 }
711
712 float brush_alpha(const Scene *scene, Brush *brush)
713 {
714         UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
715
716         return (ups->flag & UNIFIED_PAINT_ALPHA) ? ups->alpha : brush->alpha;
717 }
718
719 /* scale unprojected radius to reflect a change in the brush's 2D size */
720 void brush_scale_unprojected_radius(float *unprojected_radius,
721                                                                         int new_brush_size,
722                                                                         int old_brush_size)
723 {
724         float scale = new_brush_size;
725         /* avoid division by zero */
726         if(old_brush_size != 0)
727                 scale /= (float)old_brush_size;
728         (*unprojected_radius) *= scale;
729 }
730
731 /* scale brush size to reflect a change in the brush's unprojected radius */
732 void brush_scale_size(int *brush_size,
733                                           float new_unprojected_radius,
734                                           float old_unprojected_radius)
735 {
736         float scale = new_unprojected_radius;
737         /* avoid division by zero */
738         if(old_unprojected_radius != 0)
739                 scale /= new_unprojected_radius;
740         (*brush_size)= (int)((float)(*brush_size) * scale);
741 }
742
743 /* Brush Painting */
744
745 typedef struct BrushPainterCache {
746         short enabled;
747
748         int size;                       /* size override, if 0 uses 2*brush_size(brush) */
749         short flt;                      /* need float imbuf? */
750         short texonly;          /* no alpha, color or fallof, only texture in imbuf */
751
752         int lastsize;
753         float lastalpha;
754         float lastjitter;
755
756         ImBuf *ibuf;
757         ImBuf *texibuf;
758         ImBuf *maskibuf;
759 } BrushPainterCache;
760
761 struct BrushPainter {
762         Scene *scene;
763         Brush *brush;
764
765         float lastmousepos[2];  /* mouse position of last paint call */
766
767         float accumdistance;    /* accumulated distance of brush since last paint op */
768         float lastpaintpos[2];  /* position of last paint op */
769         float startpaintpos[2]; /* position of first paint */
770
771         double accumtime;               /* accumulated time since last paint op (airbrush) */
772         double lasttime;                /* time of last update */
773
774         float lastpressure;
775
776         short firsttouch;               /* first paint op */
777
778         float startsize;
779         float startalpha;
780         float startjitter;
781         float startspacing;
782
783         BrushPainterCache cache;
784 };
785
786 BrushPainter *brush_painter_new(Scene *scene, Brush *brush)
787 {
788         BrushPainter *painter= MEM_callocN(sizeof(BrushPainter), "BrushPainter");
789
790         painter->brush= brush;
791         painter->scene= scene;
792         painter->firsttouch= 1;
793         painter->cache.lastsize= -1; /* force ibuf create in refresh */
794
795         painter->startsize = brush_size(scene, brush);
796         painter->startalpha = brush_alpha(scene, brush);
797         painter->startjitter = brush->jitter;
798         painter->startspacing = brush->spacing;
799
800         return painter;
801 }
802
803 void brush_painter_require_imbuf(BrushPainter *painter, short flt, short texonly, int size)
804 {
805         if ((painter->cache.flt != flt) || (painter->cache.size != size) ||
806                 ((painter->cache.texonly != texonly) && texonly)) {
807                 if (painter->cache.ibuf) IMB_freeImBuf(painter->cache.ibuf);
808                 if (painter->cache.maskibuf) IMB_freeImBuf(painter->cache.maskibuf);
809                 painter->cache.ibuf= painter->cache.maskibuf= NULL;
810                 painter->cache.lastsize= -1; /* force ibuf create in refresh */
811         }
812
813         if (painter->cache.flt != flt) {
814                 if (painter->cache.texibuf) IMB_freeImBuf(painter->cache.texibuf);
815                 painter->cache.texibuf= NULL;
816                 painter->cache.lastsize= -1; /* force ibuf create in refresh */
817         }
818
819         painter->cache.size= size;
820         painter->cache.flt= flt;
821         painter->cache.texonly= texonly;
822         painter->cache.enabled= 1;
823 }
824
825 void brush_painter_free(BrushPainter *painter)
826 {
827         Brush *brush = painter->brush;
828
829         brush_set_size(painter->scene, brush, painter->startsize);
830         brush_set_alpha(painter->scene, brush, painter->startalpha);
831         brush->jitter = painter->startjitter;
832         brush->spacing = painter->startspacing;
833
834         if (painter->cache.ibuf) IMB_freeImBuf(painter->cache.ibuf);
835         if (painter->cache.texibuf) IMB_freeImBuf(painter->cache.texibuf);
836         if (painter->cache.maskibuf) IMB_freeImBuf(painter->cache.maskibuf);
837         MEM_freeN(painter);
838 }
839
840 static void brush_painter_do_partial(BrushPainter *painter, ImBuf *oldtexibuf, int x, int y, int w, int h, int xt, int yt, float *pos)
841 {
842         Scene *scene= painter->scene;
843         Brush *brush= painter->brush;
844         ImBuf *ibuf, *maskibuf, *texibuf;
845         float *bf, *mf, *tf, *otf=NULL, xoff, yoff, xy[2], rgba[4];
846         char *b, *m, *t, *ot= NULL;
847         int dotexold, origx= x, origy= y;
848         const int radius= brush_size(painter->scene, brush);
849
850         xoff = -radius + 0.5f;
851         yoff = -radius + 0.5f;
852         xoff += (int)pos[0] - (int)painter->startpaintpos[0];
853         yoff += (int)pos[1] - (int)painter->startpaintpos[1];
854
855         ibuf = painter->cache.ibuf;
856         texibuf = painter->cache.texibuf;
857         maskibuf = painter->cache.maskibuf;
858
859         dotexold = (oldtexibuf != NULL);
860
861         /* not sure if it's actually needed or it's a mistake in coords/sizes
862            calculation in brush_painter_fixed_tex_partial_update(), but without this
863            limitation memory gets corrupted at fast strokes with quite big spacing (sergey) */
864         w = MIN2(w, ibuf->x);
865         h = MIN2(h, ibuf->y);
866
867         if (painter->cache.flt) {
868                 for (; y < h; y++) {
869                         bf = ibuf->rect_float + (y*ibuf->x + origx)*4;
870                         tf = texibuf->rect_float + (y*texibuf->x + origx)*4;
871                         mf = maskibuf->rect_float + (y*maskibuf->x + origx)*4;
872
873                         if (dotexold)
874                                 otf = oldtexibuf->rect_float + ((y - origy + yt)*oldtexibuf->x + xt)*4;
875
876                         for (x=origx; x < w; x++, bf+=4, mf+=4, tf+=4) {
877                                 if (dotexold) {
878                                         copy_v3_v3(tf, otf);
879                                         tf[3] = otf[3];
880                                         otf += 4;
881                                 }
882                                 else {
883                                         xy[0] = x + xoff;
884                                         xy[1] = y + yoff;
885
886                                         brush_sample_tex(scene, brush, xy, tf, 0);
887                                 }
888
889                                 bf[0] = tf[0]*mf[0];
890                                 bf[1] = tf[1]*mf[1];
891                                 bf[2] = tf[2]*mf[2];
892                                 bf[3] = tf[3]*mf[3];
893                         }
894                 }
895         }
896         else {
897                 for (; y < h; y++) {
898                         b = (char*)ibuf->rect + (y*ibuf->x + origx)*4;
899                         t = (char*)texibuf->rect + (y*texibuf->x + origx)*4;
900                         m = (char*)maskibuf->rect + (y*maskibuf->x + origx)*4;
901
902                         if (dotexold)
903                                 ot = (char*)oldtexibuf->rect + ((y - origy + yt)*oldtexibuf->x + xt)*4;
904
905                         for (x=origx; x < w; x++, b+=4, m+=4, t+=4) {
906                                 if (dotexold) {
907                                         t[0] = ot[0];
908                                         t[1] = ot[1];
909                                         t[2] = ot[2];
910                                         t[3] = ot[3];
911                                         ot += 4;
912                                 }
913                                 else {
914                                         xy[0] = x + xoff;
915                                         xy[1] = y + yoff;
916
917                                         brush_sample_tex(scene, brush, xy, rgba, 0);
918                                         t[0]= FTOCHAR(rgba[0]);
919                                         t[1]= FTOCHAR(rgba[1]);
920                                         t[2]= FTOCHAR(rgba[2]);
921                                         t[3]= FTOCHAR(rgba[3]);
922                                 }
923
924                                 b[0] = t[0]*m[0]/255;
925                                 b[1] = t[1]*m[1]/255;
926                                 b[2] = t[2]*m[2]/255;
927                                 b[3] = t[3]*m[3]/255;
928                         }
929                 }
930         }
931 }
932
933 static void brush_painter_fixed_tex_partial_update(BrushPainter *painter, float *pos)
934 {
935         const Scene *scene= painter->scene;
936         Brush *brush= painter->brush;
937         BrushPainterCache *cache= &painter->cache;
938         ImBuf *oldtexibuf, *ibuf;
939         int imbflag, destx, desty, srcx, srcy, w, h, x1, y1, x2, y2;
940         const int diameter= 2*brush_size(scene, brush);
941
942         imbflag= (cache->flt)? IB_rectfloat: IB_rect;
943         if (!cache->ibuf)
944                 cache->ibuf= IMB_allocImBuf(diameter, diameter, 32, imbflag);
945         ibuf= cache->ibuf;
946
947         oldtexibuf= cache->texibuf;
948         cache->texibuf= IMB_allocImBuf(diameter, diameter, 32, imbflag);
949
950         if (oldtexibuf) {
951                 srcx= srcy= 0;
952                 destx= (int)painter->lastpaintpos[0] - (int)pos[0];
953                 desty= (int)painter->lastpaintpos[1] - (int)pos[1];
954                 w= oldtexibuf->x;
955                 h= oldtexibuf->y;
956
957                 IMB_rectclip(cache->texibuf, oldtexibuf, &destx, &desty, &srcx, &srcy, &w, &h);
958         }
959         else {
960                 srcx= srcy= 0;
961                 destx= desty= 0;
962                 w= h= 0;
963         }
964         
965         x1= destx;
966         y1= desty;
967         x2= destx+w;
968         y2= desty+h;
969
970         /* blend existing texture in new position */
971         if ((x1 < x2) && (y1 < y2))
972                 brush_painter_do_partial(painter, oldtexibuf, x1, y1, x2, y2, srcx, srcy, pos);
973
974         if (oldtexibuf)
975                 IMB_freeImBuf(oldtexibuf);
976
977         /* sample texture in new areas */
978         if ((0 < x1) && (0 < ibuf->y))
979                 brush_painter_do_partial(painter, NULL, 0, 0, x1, ibuf->y, 0, 0, pos);
980         if ((x2 < ibuf->x) && (0 < ibuf->y))
981                 brush_painter_do_partial(painter, NULL, x2, 0, ibuf->x, ibuf->y, 0, 0, pos);
982         if ((x1 < x2) && (0 < y1))
983                 brush_painter_do_partial(painter, NULL, x1, 0, x2, y1, 0, 0, pos);
984         if ((x1 < x2) && (y2 < ibuf->y))
985                 brush_painter_do_partial(painter, NULL, x1, y2, x2, ibuf->y, 0, 0, pos);
986 }
987
988 static void brush_painter_refresh_cache(BrushPainter *painter, float *pos, int use_color_correction)
989 {
990         const Scene *scene= painter->scene;
991         Brush *brush= painter->brush;
992         BrushPainterCache *cache= &painter->cache;
993         MTex *mtex= &brush->mtex;
994         int size;
995         short flt;
996         const int diameter= 2*brush_size(scene, brush);
997         const float alpha= brush_alpha(scene, brush);
998
999         if (diameter != cache->lastsize ||
1000                 alpha != cache->lastalpha ||
1001                 brush->jitter != cache->lastjitter)
1002         {
1003                 if (cache->ibuf) {
1004                         IMB_freeImBuf(cache->ibuf);
1005                         cache->ibuf= NULL;
1006                 }
1007                 if (cache->maskibuf) {
1008                         IMB_freeImBuf(cache->maskibuf);
1009                         cache->maskibuf= NULL;
1010                 }
1011
1012                 flt= cache->flt;
1013                 size= (cache->size)? cache->size: diameter;
1014
1015                 if (brush->flag & BRUSH_FIXED_TEX) {
1016                         brush_imbuf_new(scene, brush, flt, 3, size, &cache->maskibuf, use_color_correction);
1017                         brush_painter_fixed_tex_partial_update(painter, pos);
1018                 }
1019                 else
1020                         brush_imbuf_new(scene, brush, flt, 2, size, &cache->ibuf, use_color_correction);
1021
1022                 cache->lastsize= diameter;
1023                 cache->lastalpha= alpha;
1024                 cache->lastjitter= brush->jitter;
1025         }
1026         else if ((brush->flag & BRUSH_FIXED_TEX) && mtex && mtex->tex) {
1027                 int dx = (int)painter->lastpaintpos[0] - (int)pos[0];
1028                 int dy = (int)painter->lastpaintpos[1] - (int)pos[1];
1029
1030                 if ((dx != 0) || (dy != 0))
1031                         brush_painter_fixed_tex_partial_update(painter, pos);
1032         }
1033 }
1034
1035 void brush_painter_break_stroke(BrushPainter *painter)
1036 {
1037         painter->firsttouch= 1;
1038 }
1039
1040 static void brush_apply_pressure(BrushPainter *painter, Brush *brush, float pressure)
1041 {
1042         if (brush_use_alpha_pressure(painter->scene, brush)) 
1043                 brush_set_alpha(painter->scene, brush, MAX2(0.0f, painter->startalpha*pressure));
1044         if (brush_use_size_pressure(painter->scene, brush))
1045                 brush_set_size(painter->scene, brush, MAX2(1.0f, painter->startsize*pressure));
1046         if (brush->flag & BRUSH_JITTER_PRESSURE)
1047                 brush->jitter = MAX2(0.0f, painter->startjitter*pressure);
1048         if (brush->flag & BRUSH_SPACING_PRESSURE)
1049                 brush->spacing = MAX2(1.0f, painter->startspacing*(1.5f-pressure));
1050 }
1051
1052 void brush_jitter_pos(const Scene *scene, Brush *brush, float pos[2], float jitterpos[2])
1053 {
1054         int use_jitter= brush->jitter != 0;
1055
1056         /* jitter-ed brush gives weird and unpredictable result for this
1057            kinds of stroke, so manyally disable jitter usage (sergey) */
1058         use_jitter&= (brush->flag & (BRUSH_RESTORE_MESH|BRUSH_ANCHORED)) == 0;
1059
1060         if(use_jitter){
1061                 float rand_pos[2];
1062                 const int radius= brush_size(scene, brush);
1063                 const int diameter= 2*radius;
1064
1065                 // find random position within a circle of diameter 1
1066                 do {
1067                         rand_pos[0] = BLI_frand()-0.5f;
1068                         rand_pos[1] = BLI_frand()-0.5f;
1069                 } while (len_v2(rand_pos) > 0.5f);
1070
1071                 jitterpos[0] = pos[0] + 2*rand_pos[0]*diameter*brush->jitter;
1072                 jitterpos[1] = pos[1] + 2*rand_pos[1]*diameter*brush->jitter;
1073         }
1074         else {
1075                 copy_v2_v2(jitterpos, pos);
1076         }
1077 }
1078
1079 int brush_painter_paint(BrushPainter *painter, BrushFunc func, float *pos, double time, float pressure, void *user, int use_color_correction)
1080 {
1081         Scene *scene= painter->scene;
1082         Brush *brush= painter->brush;
1083         int totpaintops= 0;
1084
1085         if (pressure == 0.0f) {
1086                 if(painter->lastpressure) // XXX - hack, operator misses
1087                         pressure= painter->lastpressure;
1088                 else
1089                         pressure = 1.0f;        /* zero pressure == not using tablet */
1090         }
1091         if (painter->firsttouch) {
1092                 /* paint exactly once on first touch */
1093                 painter->startpaintpos[0]= pos[0];
1094                 painter->startpaintpos[1]= pos[1];
1095
1096                 brush_apply_pressure(painter, brush, pressure);
1097                 if (painter->cache.enabled)
1098                         brush_painter_refresh_cache(painter, pos, use_color_correction);
1099                 totpaintops += func(user, painter->cache.ibuf, pos, pos);
1100                 
1101                 painter->lasttime= time;
1102                 painter->firsttouch= 0;
1103                 painter->lastpaintpos[0]= pos[0];
1104                 painter->lastpaintpos[1]= pos[1];
1105         }
1106 #if 0
1107         else if (painter->brush->flag & BRUSH_AIRBRUSH) {
1108                 float spacing, step, paintpos[2], dmousepos[2], len;
1109                 double starttime, curtime= time;
1110
1111                 /* compute brush spacing adapted to brush size */
1112                 spacing= brush->rate; //radius*brush->spacing*0.01f;
1113
1114                 /* setup starting time, direction vector and accumulated time */
1115                 starttime= painter->accumtime;
1116                 sub_v2_v2v2(dmousepos, pos, painter->lastmousepos);
1117                 len= normalize_v2(dmousepos);
1118                 painter->accumtime += curtime - painter->lasttime;
1119
1120                 /* do paint op over unpainted time distance */
1121                 while (painter->accumtime >= spacing) {
1122                         step= (spacing - starttime)*len;
1123                         paintpos[0]= painter->lastmousepos[0] + dmousepos[0]*step;
1124                         paintpos[1]= painter->lastmousepos[1] + dmousepos[1]*step;
1125
1126                         if (painter->cache.enabled)
1127                                 brush_painter_refresh_cache(painter);
1128                         totpaintops += func(user, painter->cache.ibuf,
1129                                 painter->lastpaintpos, paintpos);
1130
1131                         painter->lastpaintpos[0]= paintpos[0];
1132                         painter->lastpaintpos[1]= paintpos[1];
1133                         painter->accumtime -= spacing;
1134                         starttime -= spacing;
1135                 }
1136                 
1137                 painter->lasttime= curtime;
1138         }
1139 #endif
1140         else {
1141                 float startdistance, spacing, step, paintpos[2], dmousepos[2], finalpos[2];
1142                 float t, len, press;
1143                 const int radius= brush_size(scene, brush);
1144
1145                 /* compute brush spacing adapted to brush radius, spacing may depend
1146                    on pressure, so update it */
1147                 brush_apply_pressure(painter, brush, painter->lastpressure);
1148                 spacing= MAX2(1.0f, radius)*brush->spacing*0.01f;
1149
1150                 /* setup starting distance, direction vector and accumulated distance */
1151                 startdistance= painter->accumdistance;
1152                 sub_v2_v2v2(dmousepos, pos, painter->lastmousepos);
1153                 len= normalize_v2(dmousepos);
1154                 painter->accumdistance += len;
1155
1156                 if (brush->flag & BRUSH_SPACE) {
1157                         /* do paint op over unpainted distance */
1158                         while ((len > 0.0f) && (painter->accumdistance >= spacing)) {
1159                                 step= spacing - startdistance;
1160                                 paintpos[0]= painter->lastmousepos[0] + dmousepos[0]*step;
1161                                 paintpos[1]= painter->lastmousepos[1] + dmousepos[1]*step;
1162
1163                                 t = step/len;
1164                                 press= (1.0f-t)*painter->lastpressure + t*pressure;
1165                                 brush_apply_pressure(painter, brush, press);
1166                                 spacing= MAX2(1.0f, radius)*brush->spacing*0.01f;
1167
1168                                 brush_jitter_pos(scene, brush, paintpos, finalpos);
1169
1170                                 if (painter->cache.enabled)
1171                                         brush_painter_refresh_cache(painter, finalpos, use_color_correction);
1172
1173                                 totpaintops +=
1174                                         func(user, painter->cache.ibuf, painter->lastpaintpos, finalpos);
1175
1176                                 painter->lastpaintpos[0]= paintpos[0];
1177                                 painter->lastpaintpos[1]= paintpos[1];
1178                                 painter->accumdistance -= spacing;
1179                                 startdistance -= spacing;
1180                         }
1181                 } else {
1182                         brush_jitter_pos(scene, brush, pos, finalpos);
1183
1184                         if (painter->cache.enabled)
1185                                 brush_painter_refresh_cache(painter, finalpos, use_color_correction);
1186
1187                         totpaintops += func(user, painter->cache.ibuf, pos, finalpos);
1188
1189                         painter->lastpaintpos[0]= pos[0];
1190                         painter->lastpaintpos[1]= pos[1];
1191                         painter->accumdistance= 0;
1192                 }
1193
1194                 /* do airbrush paint ops, based on the number of paint ops left over
1195                    from regular painting. this is a temporary solution until we have
1196                    accurate time stamps for mouse move events */
1197                 if (brush->flag & BRUSH_AIRBRUSH) {
1198                         double curtime= time;
1199                         double painttime= brush->rate*totpaintops;
1200
1201                         painter->accumtime += curtime - painter->lasttime;
1202                         if (painter->accumtime <= painttime)
1203                                 painter->accumtime= 0.0;
1204                         else
1205                                 painter->accumtime -= painttime;
1206
1207                         while (painter->accumtime >= (double)brush->rate) {
1208                                 brush_apply_pressure(painter, brush, pressure);
1209
1210                                 brush_jitter_pos(scene, brush, pos, finalpos);
1211
1212                                 if (painter->cache.enabled)
1213                                         brush_painter_refresh_cache(painter, finalpos, use_color_correction);
1214
1215                                 totpaintops +=
1216                                         func(user, painter->cache.ibuf, painter->lastmousepos, finalpos);
1217                                 painter->accumtime -= (double)brush->rate;
1218                         }
1219
1220                         painter->lasttime= curtime;
1221                 }
1222         }
1223
1224         painter->lastmousepos[0]= pos[0];
1225         painter->lastmousepos[1]= pos[1];
1226         painter->lastpressure= pressure;
1227
1228         brush_set_alpha(scene, brush, painter->startalpha);
1229         brush_set_size(scene, brush, painter->startsize);
1230         brush->jitter = painter->startjitter;
1231         brush->spacing = painter->startspacing;
1232
1233         return totpaintops;
1234 }
1235
1236 /* Uses the brush curve control to find a strength value between 0 and 1 */
1237 float brush_curve_strength_clamp(Brush *br, float p, const float len)
1238 {
1239         if(p >= len)    return 0;
1240         else                    p= p/len;
1241
1242         p= curvemapping_evaluateF(br->curve, 0, p);
1243         if(p < 0.0f)            p= 0.0f;
1244         else if(p > 1.0f)       p= 1.0f;
1245         return p;
1246 }
1247 /* same as above but can return negative values if the curve enables
1248  * used for sculpt only */
1249 float brush_curve_strength(Brush *br, float p, const float len)
1250 {
1251         if(p >= len)
1252                 p= 1.0f;
1253         else
1254                 p= p/len;
1255
1256         return curvemapping_evaluateF(br->curve, 0, p);
1257 }
1258
1259 /* TODO: should probably be unified with BrushPainter stuff? */
1260 unsigned int *brush_gen_texture_cache(Brush *br, int half_side)
1261 {
1262         unsigned int *texcache = NULL;
1263         MTex *mtex = &br->mtex;
1264         TexResult texres= {0};
1265         int hasrgb, ix, iy;
1266         int side = half_side * 2;
1267         
1268         if(mtex->tex) {
1269                 float x, y, step = 2.0 / side, co[3];
1270
1271                 texcache = MEM_callocN(sizeof(int) * side * side, "Brush texture cache");
1272
1273                 BKE_image_get_ibuf(mtex->tex->ima, NULL);
1274                 
1275                 /*do normalized cannonical view coords for texture*/
1276                 for (y=-1.0, iy=0; iy<side; iy++, y += step) {
1277                         for (x=-1.0, ix=0; ix<side; ix++, x += step) {
1278                                 co[0]= x;
1279                                 co[1]= y;
1280                                 co[2]= 0.0f;
1281                                 
1282                                 /* This is copied from displace modifier code */
1283                                 hasrgb = multitex_ext(mtex->tex, co, NULL, NULL, 0, &texres);
1284                         
1285                                 /* if the texture gave an RGB value, we assume it didn't give a valid
1286                                  * intensity, so calculate one (formula from do_material_tex).
1287                                  * if the texture didn't give an RGB value, copy the intensity across
1288                                  */
1289                                 if(hasrgb & TEX_RGB)
1290                                         texres.tin = (0.35f * texres.tr + 0.45f *
1291                                                                   texres.tg + 0.2f * texres.tb);
1292
1293                                 texres.tin = texres.tin * 255.0f;
1294                                 ((char*)texcache)[(iy*side+ix)*4] = (char)texres.tin;
1295                                 ((char*)texcache)[(iy*side+ix)*4+1] = (char)texres.tin;
1296                                 ((char*)texcache)[(iy*side+ix)*4+2] = (char)texres.tin;
1297                                 ((char*)texcache)[(iy*side+ix)*4+3] = (char)texres.tin;
1298                         }
1299                 }
1300         }
1301
1302         return texcache;
1303 }
1304
1305 /**** Radial Control ****/
1306 struct ImBuf *brush_gen_radial_control_imbuf(Brush *br)
1307 {
1308         ImBuf *im = MEM_callocN(sizeof(ImBuf), "radial control texture");
1309         unsigned int *texcache;
1310         int side = 128;
1311         int half = side / 2;
1312         int i, j;
1313
1314         texcache = brush_gen_texture_cache(br, half);
1315         im->rect_float = MEM_callocN(sizeof(float) * side * side, "radial control rect");
1316         im->x = im->y = side;
1317
1318         for(i=0; i<side; ++i) {
1319                 for(j=0; j<side; ++j) {
1320                         float magn= sqrt(pow(i - half, 2) + pow(j - half, 2));
1321                         im->rect_float[i*side + j]= brush_curve_strength_clamp(br, magn, half);
1322                 }
1323         }
1324
1325         /* Modulate curve with texture */
1326         if(texcache) {
1327                 for(i=0; i<side; ++i) {
1328                         for(j=0; j<side; ++j) {
1329                                 const int col= texcache[i*side+j];
1330                                 im->rect_float[i*side+j]*= (((char*)&col)[0]+((char*)&col)[1]+((char*)&col)[2])/3.0f/255.0f;
1331                         }
1332                 }
1333
1334                 MEM_freeN(texcache);
1335         }
1336
1337         return im;
1338 }