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make horizontal gradients faster by not jumping around in memory as much
[chaz/openbox] / render / gradient.c
1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
2
3 gradient.c for the Openbox window manager
4 Copyright (c) 2006 Mikael Magnusson
5 Copyright (c) 2003-2008 Dana Jansens
6 Copyright (c) 2003 Derek Foreman
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 See the COPYING file for a copy of the GNU General Public License.
19 */
20
21 #include "render.h"
22 #include "gradient.h"
23 #include "color.h"
24 #include <glib.h>
25 #include <string.h>
26
27 static void highlight(RrSurface *s, RrPixel32 *x, RrPixel32 *y,
28 gboolean raised);
29 static void gradient_parentrelative(RrAppearance *a, gint w, gint h);
30 static void gradient_solid(RrAppearance *l, gint w, gint h);
31 static void gradient_splitvertical(RrAppearance *a, gint w, gint h);
32 static void gradient_vertical(RrSurface *sf, gint w, gint h);
33 static void gradient_horizontal(RrSurface *sf, gint w, gint h);
34 static void gradient_mirrorhorizontal(RrSurface *sf, gint w, gint h);
35 static void gradient_diagonal(RrSurface *sf, gint w, gint h);
36 static void gradient_crossdiagonal(RrSurface *sf, gint w, gint h);
37 static void gradient_pyramid(RrSurface *sf, gint inw, gint inh);
38
39 void RrRender(RrAppearance *a, gint w, gint h)
40 {
41 RrPixel32 *data = a->surface.pixel_data;
42 RrPixel32 current;
43 guint r,g,b;
44 gint off, x;
45
46 switch (a->surface.grad) {
47 case RR_SURFACE_PARENTREL:
48 gradient_parentrelative(a, w, h);
49 break;
50 case RR_SURFACE_SOLID:
51 gradient_solid(a, w, h);
52 break;
53 case RR_SURFACE_SPLIT_VERTICAL:
54 gradient_splitvertical(a, w, h);
55 break;
56 case RR_SURFACE_VERTICAL:
57 gradient_vertical(&a->surface, w, h);
58 break;
59 case RR_SURFACE_HORIZONTAL:
60 gradient_horizontal(&a->surface, w, h);
61 break;
62 case RR_SURFACE_MIRROR_HORIZONTAL:
63 gradient_mirrorhorizontal(&a->surface, w, h);
64 break;
65 case RR_SURFACE_DIAGONAL:
66 gradient_diagonal(&a->surface, w, h);
67 break;
68 case RR_SURFACE_CROSS_DIAGONAL:
69 gradient_crossdiagonal(&a->surface, w, h);
70 break;
71 case RR_SURFACE_PYRAMID:
72 gradient_pyramid(&a->surface, w, h);
73 break;
74 default:
75 g_assert_not_reached(); /* unhandled gradient */
76 return;
77 }
78
79 if (a->surface.interlaced) {
80 gint i;
81 RrPixel32 *p;
82
83 r = a->surface.interlace_color->r;
84 g = a->surface.interlace_color->g;
85 b = a->surface.interlace_color->b;
86 current = (r << RrDefaultRedOffset)
87 + (g << RrDefaultGreenOffset)
88 + (b << RrDefaultBlueOffset);
89 p = data;
90 for (i = 0; i < h; i += 2, p += w)
91 for (x = 0; x < w; ++x, ++p)
92 *p = current;
93 }
94
95 if (a->surface.relief == RR_RELIEF_FLAT && a->surface.border) {
96 r = a->surface.border_color->r;
97 g = a->surface.border_color->g;
98 b = a->surface.border_color->b;
99 current = (r << RrDefaultRedOffset)
100 + (g << RrDefaultGreenOffset)
101 + (b << RrDefaultBlueOffset);
102 for (off = 0, x = 0; x < w; ++x, off++) {
103 *(data + off) = current;
104 *(data + off + ((h-1) * w)) = current;
105 }
106 for (off = 0, x = 0; x < h; ++x, off++) {
107 *(data + (off * w)) = current;
108 *(data + (off * w) + w - 1) = current;
109 }
110 }
111
112 if (a->surface.relief != RR_RELIEF_FLAT) {
113 if (a->surface.bevel == RR_BEVEL_1) {
114 for (off = 1, x = 1; x < w - 1; ++x, off++)
115 highlight(&a->surface, data + off,
116 data + off + (h-1) * w,
117 a->surface.relief==RR_RELIEF_RAISED);
118 for (off = 0, x = 0; x < h; ++x, off++)
119 highlight(&a->surface, data + off * w,
120 data + off * w + w - 1,
121 a->surface.relief==RR_RELIEF_RAISED);
122 }
123
124 if (a->surface.bevel == RR_BEVEL_2) {
125 for (off = 2, x = 2; x < w - 2; ++x, off++)
126 highlight(&a->surface, data + off + w,
127 data + off + (h-2) * w,
128 a->surface.relief==RR_RELIEF_RAISED);
129 for (off = 1, x = 1; x < h-1; ++x, off++)
130 highlight(&a->surface, data + off * w + 1,
131 data + off * w + w - 2,
132 a->surface.relief==RR_RELIEF_RAISED);
133 }
134 }
135 }
136
137 static void highlight(RrSurface *s, RrPixel32 *x, RrPixel32 *y, gboolean raised)
138 {
139 gint r, g, b;
140
141 RrPixel32 *up, *down;
142 if (raised) {
143 up = x;
144 down = y;
145 } else {
146 up = y;
147 down = x;
148 }
149
150 r = (*up >> RrDefaultRedOffset) & 0xFF;
151 r += (r * s->bevel_light_adjust) >> 8;
152 g = (*up >> RrDefaultGreenOffset) & 0xFF;
153 g += (g * s->bevel_light_adjust) >> 8;
154 b = (*up >> RrDefaultBlueOffset) & 0xFF;
155 b += (b * s->bevel_light_adjust) >> 8;
156 if (r > 0xFF) r = 0xFF;
157 if (g > 0xFF) g = 0xFF;
158 if (b > 0xFF) b = 0xFF;
159 *up = (r << RrDefaultRedOffset) + (g << RrDefaultGreenOffset)
160 + (b << RrDefaultBlueOffset);
161
162 r = (*down >> RrDefaultRedOffset) & 0xFF;
163 r -= (r * s->bevel_dark_adjust) >> 8;
164 g = (*down >> RrDefaultGreenOffset) & 0xFF;
165 g -= (g * s->bevel_dark_adjust) >> 8;
166 b = (*down >> RrDefaultBlueOffset) & 0xFF;
167 b -= (b * s->bevel_dark_adjust) >> 8;
168 *down = (r << RrDefaultRedOffset) + (g << RrDefaultGreenOffset)
169 + (b << RrDefaultBlueOffset);
170 }
171
172 static void create_bevel_colors(RrAppearance *l)
173 {
174 gint r, g, b;
175
176 /* light color */
177 r = l->surface.primary->r;
178 r += (r * l->surface.bevel_light_adjust) >> 8;
179 g = l->surface.primary->g;
180 g += (g * l->surface.bevel_light_adjust) >> 8;
181 b = l->surface.primary->b;
182 b += (b * l->surface.bevel_light_adjust) >> 8;
183 if (r > 0xFF) r = 0xFF;
184 if (g > 0xFF) g = 0xFF;
185 if (b > 0xFF) b = 0xFF;
186 g_assert(!l->surface.bevel_light);
187 l->surface.bevel_light = RrColorNew(l->inst, r, g, b);
188
189 /* dark color */
190 r = l->surface.primary->r;
191 r -= (r * l->surface.bevel_dark_adjust) >> 8;
192 g = l->surface.primary->g;
193 g -= (g * l->surface.bevel_dark_adjust) >> 8;
194 b = l->surface.primary->b;
195 b -= (b * l->surface.bevel_dark_adjust) >> 8;
196 g_assert(!l->surface.bevel_dark);
197 l->surface.bevel_dark = RrColorNew(l->inst, r, g, b);
198 }
199
200 static void gradient_parentrelative(RrAppearance *a, gint w, gint h)
201 {
202 RrPixel32 *source, *dest;
203 gint sw, sh, partial_w, partial_h, i;
204
205 g_assert (a->surface.parent);
206 g_assert (a->surface.parent->w);
207
208 sw = a->surface.parent->w;
209 sh = a->surface.parent->h;
210
211 /* This is a little hack. When a texture is parentrelative, and the same
212 area as the parent, and has a bevel, it will draw its bevel on top
213 of the parent's, amplifying it. So instead, rerender the child with
214 the parent's settings, but the child's bevel and interlace */
215 if (a->surface.relief != RR_RELIEF_FLAT &&
216 (a->surface.parent->surface.relief != RR_RELIEF_FLAT ||
217 a->surface.parent->surface.border) &&
218 !a->surface.parentx && !a->surface.parenty &&
219 sw == w && sh == h)
220 {
221 RrSurface old = a->surface;
222 a->surface = a->surface.parent->surface;
223
224 /* turn these off for the parent */
225 a->surface.relief = RR_RELIEF_FLAT;
226 a->surface.border = FALSE;
227
228 a->surface.pixel_data = old.pixel_data;
229
230 RrRender(a, w, h);
231 a->surface = old;
232 } else {
233 source = (a->surface.parent->surface.pixel_data +
234 a->surface.parentx + sw * a->surface.parenty);
235 dest = a->surface.pixel_data;
236
237 if (a->surface.parentx + w > sw) {
238 partial_w = sw - a->surface.parentx;
239 } else partial_w = w;
240
241 if (a->surface.parenty + h > sh) {
242 partial_h = sh - a->surface.parenty;
243 } else partial_h = h;
244
245 for (i = 0; i < partial_h; i++, source += sw, dest += w) {
246 memcpy(dest, source, partial_w * sizeof(RrPixel32));
247 }
248 }
249 }
250
251 static void gradient_solid(RrAppearance *l, gint w, gint h)
252 {
253 gint i;
254 RrPixel32 pix;
255 RrPixel32 *data = l->surface.pixel_data;
256 RrSurface *sp = &l->surface;
257 gint left = 0, top = 0, right = w - 1, bottom = h - 1;
258
259 pix = (sp->primary->r << RrDefaultRedOffset)
260 + (sp->primary->g << RrDefaultGreenOffset)
261 + (sp->primary->b << RrDefaultBlueOffset);
262
263 for (i = 0; i < w * h; i++)
264 *data++ = pix;
265
266 if (sp->interlaced)
267 return;
268
269 XFillRectangle(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->primary),
270 0, 0, w, h);
271
272 switch (sp->relief) {
273 case RR_RELIEF_RAISED:
274 if (!sp->bevel_dark)
275 create_bevel_colors(l);
276
277 switch (sp->bevel) {
278 case RR_BEVEL_1:
279 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
280 left, bottom, right, bottom);
281 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
282 right, bottom, right, top);
283
284 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
285 left, top, right, top);
286 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
287 left, bottom, left, top);
288 break;
289 case RR_BEVEL_2:
290 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
291 left + 2, bottom - 1, right - 2, bottom - 1);
292 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
293 right - 1, bottom - 1, right - 1, top + 1);
294
295 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
296 left + 2, top + 1, right - 2, top + 1);
297 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
298 left + 1, bottom - 1, left + 1, top + 1);
299 break;
300 default:
301 g_assert_not_reached(); /* unhandled BevelType */
302 }
303 break;
304 case RR_RELIEF_SUNKEN:
305 if (!sp->bevel_dark)
306 create_bevel_colors(l);
307
308 switch (sp->bevel) {
309 case RR_BEVEL_1:
310 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
311 left, bottom, right, bottom);
312 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
313 right, bottom, right, top);
314
315 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
316 left, top, right, top);
317 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
318 left, bottom, left, top);
319 break;
320 case RR_BEVEL_2:
321 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
322 left + 2, bottom - 1, right - 2, bottom - 1);
323 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
324 right - 1, bottom - 1, right - 1, top + 1);
325
326 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
327 left + 2, top + 1, right - 2, top + 1);
328 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
329 left + 1, bottom - 1, left + 1, top + 1);
330 break;
331 default:
332 g_assert_not_reached(); /* unhandled BevelType */
333 }
334 break;
335 case RR_RELIEF_FLAT:
336 if (sp->border) {
337 XDrawRectangle(RrDisplay(l->inst), l->pixmap,
338 RrColorGC(sp->border_color),
339 left, top, right, bottom);
340 }
341 break;
342 default:
343 g_assert_not_reached(); /* unhandled ReliefType */
344 }
345 }
346
347 /* * * * * * * * * * * * * * GRADIENT MAGIC WOOT * * * * * * * * * * * * * * */
348
349 #define VARS(x) \
350 guint color##x[3]; \
351 gint len##x, cdelta##x[3], error##x[3] = { 0, 0, 0 }, inc##x[3]; \
352 gboolean bigslope##x[3] /* color slope > 1 */
353
354 #define SETUP(x, from, to, w) \
355 len##x = w; \
356 \
357 color##x[0] = from->r; \
358 color##x[1] = from->g; \
359 color##x[2] = from->b; \
360 \
361 cdelta##x[0] = to->r - from->r; \
362 cdelta##x[1] = to->g - from->g; \
363 cdelta##x[2] = to->b - from->b; \
364 \
365 if (cdelta##x[0] < 0) { \
366 cdelta##x[0] = -cdelta##x[0]; \
367 inc##x[0] = -1; \
368 } else \
369 inc##x[0] = 1; \
370 if (cdelta##x[1] < 0) { \
371 cdelta##x[1] = -cdelta##x[1]; \
372 inc##x[1] = -1; \
373 } else \
374 inc##x[1] = 1; \
375 if (cdelta##x[2] < 0) { \
376 cdelta##x[2] = -cdelta##x[2]; \
377 inc##x[2] = -1; \
378 } else \
379 inc##x[2] = 1; \
380 bigslope##x[0] = cdelta##x[0] > w;\
381 bigslope##x[1] = cdelta##x[1] > w;\
382 bigslope##x[2] = cdelta##x[2] > w
383
384 #define COLOR_RR(x, c) \
385 c->r = color##x[0]; \
386 c->g = color##x[1]; \
387 c->b = color##x[2]
388
389 #define COLOR(x) \
390 ((color##x[0] << RrDefaultRedOffset) + \
391 (color##x[1] << RrDefaultGreenOffset) + \
392 (color##x[2] << RrDefaultBlueOffset))
393
394 #define INCREMENT(x, i) \
395 (inc##x[i])
396
397 #define NEXT(x) \
398 { \
399 gint i; \
400 for (i = 2; i >= 0; --i) { \
401 if (!cdelta##x[i]) continue; \
402 \
403 if (!bigslope##x[i]) { \
404 /* Y (color) is dependant on X */ \
405 error##x[i] += cdelta##x[i]; \
406 if ((error##x[i] << 1) >= len##x) { \
407 color##x[i] += INCREMENT(x, i); \
408 error##x[i] -= len##x; \
409 } \
410 } else { \
411 /* X is dependant on Y (color) */ \
412 while (1) { \
413 color##x[i] += INCREMENT(x, i); \
414 error##x[i] += len##x; \
415 if ((error##x[i] << 1) >= cdelta##x[i]) { \
416 error##x[i] -= cdelta##x[i]; \
417 break; \
418 } \
419 } \
420 } \
421 } \
422 }
423
424 static void gradient_splitvertical(RrAppearance *a, gint w, gint h)
425 {
426 gint x, y1, y2, y3;
427 RrSurface *sf = &a->surface;
428 RrPixel32 *data = sf->pixel_data;
429 RrPixel32 current;
430 gint y1sz, y2sz, y3sz;
431
432 VARS(y1);
433 VARS(y2);
434 VARS(y3);
435
436 /* if h <= 5, then a 0 or 1px middle gradient.
437 if h > 5, then always a 1px middle gradient.
438 */
439 if (h <= 5) {
440 y1sz = MAX(h/2, 0);
441 y2sz = (h < 3 ? 0 : h % 2);
442 y3sz = MAX(h/2, 1);
443 }
444 else {
445 y1sz = h/2 - (1 - (h % 2));
446 y2sz = 1;
447 y3sz = h/2;
448 }
449
450 SETUP(y1, sf->split_primary, sf->primary, y1sz);
451 if (y2sz) {
452 /* setup to get the colors _in between_ these other 2 */
453 SETUP(y2, sf->primary, sf->secondary, y2sz + 2);
454 NEXT(y2); /* skip the first one, its the same as the last of y1 */
455 }
456 SETUP(y3, sf->secondary, sf->split_secondary, y3sz);
457
458 for (y1 = y1sz; y1 > 0; --y1) {
459 current = COLOR(y1);
460 for (x = w - 1; x >= 0; --x)
461 *(data++) = current;
462
463 NEXT(y1);
464 }
465
466 for (y2 = y2sz; y2 > 0; --y2) {
467 current = COLOR(y2);
468 for (x = w - 1; x >= 0; --x)
469 *(data++) = current;
470
471 NEXT(y2);
472 }
473
474 for (y3 = y3sz; y3 > 0; --y3) {
475 current = COLOR(y3);
476 for (x = w - 1; x >= 0; --x)
477 *(data++) = current;
478
479 NEXT(y3);
480 }
481 }
482
483 static void gradient_horizontal(RrSurface *sf, gint w, gint h)
484 {
485 gint x, y;
486 RrPixel32 *data = sf->pixel_data, *datav;
487
488 VARS(x);
489 SETUP(x, sf->primary, sf->secondary, w);
490
491 datav = data;
492 for (x = w - 1; x > 0; --x) { /* 0 -> w - 1 */
493 *datav = COLOR(x);
494 ++datav;
495 NEXT(x);
496 }
497 *datav = COLOR(x);
498 ++datav;
499
500 for (y = h - 1; y > 0; --y) { /* 1 -> h */
501 memcpy(datav, data, w * sizeof(RrPixel32));
502 datav += w;
503 }
504 }
505
506 static void gradient_mirrorhorizontal(RrSurface *sf, gint w, gint h)
507 {
508 gint x, y, half1, half2;
509 RrPixel32 *data = sf->pixel_data, *datav;
510
511 VARS(x);
512
513 half1 = (w + 1) / 2;
514 half2 = w / 2;
515
516 SETUP(x, sf->primary, sf->secondary, half1);
517 datav = data;
518 for (x = half1 - 1; x > 0; --x) { /* 0 -> half1 - 1 */
519 *datav = COLOR(x);
520 ++datav;
521 NEXT(x);
522 }
523 *datav = COLOR(x);
524 ++datav;
525
526 if (half2 > 0) {
527 SETUP(x, sf->secondary, sf->primary, half2);
528 for (x = half2 - 1; x > 0; --x) { /* 0 -> half2 - 1 */
529 *datav = COLOR(x);
530 ++datav;
531 NEXT(x);
532 }
533 *datav = COLOR(x);
534 ++datav;
535 }
536
537 for (y = h - 1; y > 0; --y) { /* 1 -> h */
538 memcpy(datav, data, w * sizeof(RrPixel32));
539 datav += w;
540 }
541 }
542
543 static void gradient_vertical(RrSurface *sf, gint w, gint h)
544 {
545 gint x, y;
546 RrPixel32 *data = sf->pixel_data;
547 RrPixel32 current;
548
549 VARS(y);
550 SETUP(y, sf->primary, sf->secondary, h);
551
552 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
553 current = COLOR(y);
554 for (x = w - 1; x >= 0; --x) /* 0 -> w */
555 *(data++) = current;
556
557 NEXT(y);
558 }
559 current = COLOR(y);
560 for (x = w - 1; x >= 0; --x) /* 0 -> w */
561 *(data++) = current;
562 }
563
564
565 static void gradient_diagonal(RrSurface *sf, gint w, gint h)
566 {
567 gint x, y;
568 RrPixel32 *data = sf->pixel_data;
569 RrColor left, right;
570 RrColor extracorner;
571
572 VARS(lefty);
573 VARS(righty);
574 VARS(x);
575
576 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
577 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
578 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
579
580 SETUP(lefty, sf->primary, (&extracorner), h);
581 SETUP(righty, (&extracorner), sf->secondary, h);
582
583 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
584 COLOR_RR(lefty, (&left));
585 COLOR_RR(righty, (&right));
586
587 SETUP(x, (&left), (&right), w);
588
589 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
590 *(data++) = COLOR(x);
591
592 NEXT(x);
593 }
594 *(data++) = COLOR(x);
595
596 NEXT(lefty);
597 NEXT(righty);
598 }
599 COLOR_RR(lefty, (&left));
600 COLOR_RR(righty, (&right));
601
602 SETUP(x, (&left), (&right), w);
603
604 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
605 *(data++) = COLOR(x);
606
607 NEXT(x);
608 }
609 *data = COLOR(x);
610 }
611
612 static void gradient_crossdiagonal(RrSurface *sf, gint w, gint h)
613 {
614 gint x, y;
615 RrPixel32 *data = sf->pixel_data;
616 RrColor left, right;
617 RrColor extracorner;
618
619 VARS(lefty);
620 VARS(righty);
621 VARS(x);
622
623 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
624 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
625 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
626
627 SETUP(lefty, (&extracorner), sf->secondary, h);
628 SETUP(righty, sf->primary, (&extracorner), h);
629
630 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
631 COLOR_RR(lefty, (&left));
632 COLOR_RR(righty, (&right));
633
634 SETUP(x, (&left), (&right), w);
635
636 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
637 *(data++) = COLOR(x);
638
639 NEXT(x);
640 }
641 *(data++) = COLOR(x);
642
643 NEXT(lefty);
644 NEXT(righty);
645 }
646 COLOR_RR(lefty, (&left));
647 COLOR_RR(righty, (&right));
648
649 SETUP(x, (&left), (&right), w);
650
651 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
652 *(data++) = COLOR(x);
653
654 NEXT(x);
655 }
656 *data = COLOR(x);
657 }
658
659 static void gradient_pyramid(RrSurface *sf, gint inw, gint inh)
660 {
661 gint x, y, w = (inw >> 1) + 1, h = (inh >> 1) + 1;
662 RrPixel32 *data = sf->pixel_data;
663 RrPixel32 *end = data + inw*inh - 1;
664 RrPixel32 current;
665 RrColor left, right;
666 RrColor extracorner;
667
668 VARS(lefty);
669 VARS(righty);
670 VARS(x);
671
672 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
673 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
674 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
675
676 SETUP(lefty, (&extracorner), sf->secondary, h);
677 SETUP(righty, sf->primary, (&extracorner), h);
678
679 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
680 COLOR_RR(lefty, (&left));
681 COLOR_RR(righty, (&right));
682
683 SETUP(x, (&left), (&right), w);
684
685 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
686 current = COLOR(x);
687 *(data+x) = current;
688 *(data+inw-x) = current;
689 *(end-x) = current;
690 *(end-(inw-x)) = current;
691
692 NEXT(x);
693 }
694 current = COLOR(x);
695 *(data+x) = current;
696 *(data+inw-x) = current;
697 *(end-x) = current;
698 *(end-(inw-x)) = current;
699
700 data+=inw;
701 end-=inw;
702
703 NEXT(lefty);
704 NEXT(righty);
705 }
706 COLOR_RR(lefty, (&left));
707 COLOR_RR(righty, (&right));
708
709 SETUP(x, (&left), (&right), w);
710
711 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
712 current = COLOR(x);
713 *(data+x) = current;
714 *(data+inw-x) = current;
715 *(end-x) = current;
716 *(end-(inw-x)) = current;
717
718 NEXT(x);
719 }
720 current = COLOR(x);
721 *(data+x) = current;
722 *(data+inw-x) = current;
723 *(end-x) = current;
724 *(end-(inw-x)) = current;
725 }
726
my patches for the openbox window manager
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