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add interlaceColor, and support interlaced gradients
[chaz/openbox] / render / gradient.c
1 #include "render.h"
2 #include "gradient.h"
3 #include "color.h"
4 #include <glib.h>
5
6 static void highlight(RrPixel32 *x, RrPixel32 *y, gboolean raised);
7 static void gradient_solid(RrAppearance *l, int w, int h);
8 static void gradient_vertical(RrSurface *sf, int w, int h);
9 static void gradient_horizontal(RrSurface *sf, int w, int h);
10 static void gradient_diagonal(RrSurface *sf, int w, int h);
11 static void gradient_crossdiagonal(RrSurface *sf, int w, int h);
12 static void gradient_pyramid(RrSurface *sf, int inw, int inh);
13
14 void RrRender(RrAppearance *a, int w, int h)
15 {
16 RrPixel32 *data = a->surface.pixel_data;
17 RrPixel32 current;
18 unsigned int r,g,b;
19 int off, x;
20
21 switch (a->surface.grad) {
22 case RR_SURFACE_SOLID:
23 gradient_solid(a, w, h);
24 break;
25 case RR_SURFACE_VERTICAL:
26 gradient_vertical(&a->surface, w, h);
27 break;
28 case RR_SURFACE_HORIZONTAL:
29 gradient_horizontal(&a->surface, w, h);
30 break;
31 case RR_SURFACE_DIAGONAL:
32 gradient_diagonal(&a->surface, w, h);
33 break;
34 case RR_SURFACE_CROSS_DIAGONAL:
35 gradient_crossdiagonal(&a->surface, w, h);
36 break;
37 case RR_SURFACE_PYRAMID:
38 gradient_pyramid(&a->surface, w, h);
39 break;
40 default:
41 g_assert_not_reached(); /* unhandled gradient */
42 return;
43 }
44
45 if (a->surface.relief == RR_RELIEF_FLAT && a->surface.border) {
46 r = a->surface.border_color->r;
47 g = a->surface.border_color->g;
48 b = a->surface.border_color->b;
49 current = (r << RrDefaultRedOffset)
50 + (g << RrDefaultGreenOffset)
51 + (b << RrDefaultBlueOffset);
52 for (off = 0, x = 0; x < w; ++x, off++) {
53 *(data + off) = current;
54 *(data + off + ((h-1) * w)) = current;
55 }
56 for (off = 0, x = 0; x < h; ++x, off++) {
57 *(data + (off * w)) = current;
58 *(data + (off * w) + w - 1) = current;
59 }
60 }
61
62 if (a->surface.relief != RR_RELIEF_FLAT) {
63 if (a->surface.bevel == RR_BEVEL_1) {
64 for (off = 1, x = 1; x < w - 1; ++x, off++)
65 highlight(data + off,
66 data + off + (h-1) * w,
67 a->surface.relief==RR_RELIEF_RAISED);
68 for (off = 0, x = 0; x < h; ++x, off++)
69 highlight(data + off * w,
70 data + off * w + w - 1,
71 a->surface.relief==RR_RELIEF_RAISED);
72 }
73
74 if (a->surface.bevel == RR_BEVEL_2) {
75 for (off = 2, x = 2; x < w - 2; ++x, off++)
76 highlight(data + off + w,
77 data + off + (h-2) * w,
78 a->surface.relief==RR_RELIEF_RAISED);
79 for (off = 1, x = 1; x < h-1; ++x, off++)
80 highlight(data + off * w + 1,
81 data + off * w + w - 2,
82 a->surface.relief==RR_RELIEF_RAISED);
83 }
84 }
85
86 if (a->surface.interlaced) {
87 int i;
88 RrPixel32 *p;
89
90 r = a->surface.interlace_color->r;
91 g = a->surface.interlace_color->g;
92 b = a->surface.interlace_color->b;
93 current = (r << RrDefaultRedOffset)
94 + (g << RrDefaultGreenOffset)
95 + (b << RrDefaultBlueOffset);
96 p = data;
97 for (i = 0; i < h; i += 2, p += w)
98 for (x = 0; x < w; ++x, ++p)
99 *p = current;
100 }
101
102 }
103
104 static void highlight(RrPixel32 *x, RrPixel32 *y, gboolean raised)
105 {
106 int r, g, b;
107
108 RrPixel32 *up, *down;
109 if (raised) {
110 up = x;
111 down = y;
112 } else {
113 up = y;
114 down = x;
115 }
116 r = (*up >> RrDefaultRedOffset) & 0xFF;
117 r += r >> 1;
118 g = (*up >> RrDefaultGreenOffset) & 0xFF;
119 g += g >> 1;
120 b = (*up >> RrDefaultBlueOffset) & 0xFF;
121 b += b >> 1;
122 if (r > 0xFF) r = 0xFF;
123 if (g > 0xFF) g = 0xFF;
124 if (b > 0xFF) b = 0xFF;
125 *up = (r << RrDefaultRedOffset) + (g << RrDefaultGreenOffset)
126 + (b << RrDefaultBlueOffset);
127
128 r = (*down >> RrDefaultRedOffset) & 0xFF;
129 r = (r >> 1) + (r >> 2);
130 g = (*down >> RrDefaultGreenOffset) & 0xFF;
131 g = (g >> 1) + (g >> 2);
132 b = (*down >> RrDefaultBlueOffset) & 0xFF;
133 b = (b >> 1) + (b >> 2);
134 *down = (r << RrDefaultRedOffset) + (g << RrDefaultGreenOffset)
135 + (b << RrDefaultBlueOffset);
136 }
137
138 static void create_bevel_colors(RrAppearance *l)
139 {
140 int r, g, b;
141
142 /* light color */
143 r = l->surface.primary->r;
144 r += r >> 1;
145 g = l->surface.primary->g;
146 g += g >> 1;
147 b = l->surface.primary->b;
148 b += b >> 1;
149 if (r > 0xFF) r = 0xFF;
150 if (g > 0xFF) g = 0xFF;
151 if (b > 0xFF) b = 0xFF;
152 g_assert(!l->surface.bevel_light);
153 l->surface.bevel_light = RrColorNew(l->inst, r, g, b);
154
155 /* dark color */
156 r = l->surface.primary->r;
157 r = (r >> 1) + (r >> 2);
158 g = l->surface.primary->g;
159 g = (g >> 1) + (g >> 2);
160 b = l->surface.primary->b;
161 b = (b >> 1) + (b >> 2);
162 g_assert(!l->surface.bevel_dark);
163 l->surface.bevel_dark = RrColorNew(l->inst, r, g, b);
164 }
165
166 static void gradient_solid(RrAppearance *l, int w, int h)
167 {
168 RrPixel32 pix;
169 int i, a, b;
170 RrSurface *sp = &l->surface;
171 int left = 0, top = 0, right = w - 1, bottom = h - 1;
172
173 pix = (sp->primary->r << RrDefaultRedOffset)
174 + (sp->primary->g << RrDefaultGreenOffset)
175 + (sp->primary->b << RrDefaultBlueOffset);
176
177 for (a = 0; a < w; a++)
178 for (b = 0; b < h; b++)
179 sp->pixel_data[a + b * w] = pix;
180
181 XFillRectangle(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->primary),
182 0, 0, w, h);
183
184 if (sp->interlaced) {
185 for (i = 0; i < h; i += 2)
186 XDrawLine(RrDisplay(l->inst), l->pixmap,
187 RrColorGC(sp->interlace_color),
188 0, i, w, i);
189 }
190
191 switch (sp->relief) {
192 case RR_RELIEF_RAISED:
193 if (!sp->bevel_dark)
194 create_bevel_colors(l);
195
196 switch (sp->bevel) {
197 case RR_BEVEL_1:
198 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
199 left, bottom, right, bottom);
200 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
201 right, bottom, right, top);
202
203 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
204 left, top, right, top);
205 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
206 left, bottom, left, top);
207 break;
208 case RR_BEVEL_2:
209 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
210 left + 1, bottom - 2, right - 2, bottom - 2);
211 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
212 right - 2, bottom - 2, right - 2, top + 1);
213
214 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
215 left + 1, top + 1, right - 2, top + 1);
216 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
217 left + 1, bottom - 2, left + 1, top + 1);
218 break;
219 default:
220 g_assert_not_reached(); /* unhandled BevelType */
221 }
222 break;
223 case RR_RELIEF_SUNKEN:
224 if (!sp->bevel_dark)
225 create_bevel_colors(l);
226
227 switch (sp->bevel) {
228 case RR_BEVEL_1:
229 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
230 left, bottom, right, bottom);
231 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
232 right, bottom, right, top);
233
234 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
235 left, top, right, top);
236 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
237 left, bottom, left, top);
238 break;
239 case RR_BEVEL_2:
240 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
241 left + 1, bottom - 2, right - 2, bottom - 2);
242 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
243 right - 2, bottom - 2, right - 2, top + 1);
244
245 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
246 left + 1, top + 1, right - 2, top + 1);
247 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
248 left + 1, bottom - 2, left + 1, top + 1);
249
250 break;
251 default:
252 g_assert_not_reached(); /* unhandled BevelType */
253 }
254 break;
255 case RR_RELIEF_FLAT:
256 if (sp->border) {
257 XDrawRectangle(RrDisplay(l->inst), l->pixmap,
258 RrColorGC(sp->border_color),
259 left, top, right, bottom);
260 }
261 break;
262 default:
263 g_assert_not_reached(); /* unhandled ReliefType */
264 }
265 }
266
267 /* * * * * * * * * * * * * * GRADIENT MAGIC WOOT * * * * * * * * * * * * * * */
268
269 #define VARS(x) \
270 unsigned int color##x[3]; \
271 int len##x, cdelta##x[3], error##x[3] = { 0, 0, 0 }, inc##x[3]; \
272 gboolean bigslope##x[3] /* color slope > 1 */
273
274 #define SETUP(x, from, to, w) \
275 len##x = w; \
276 \
277 color##x[0] = from->r; \
278 color##x[1] = from->g; \
279 color##x[2] = from->b; \
280 \
281 cdelta##x[0] = to->r - from->r; \
282 cdelta##x[1] = to->g - from->g; \
283 cdelta##x[2] = to->b - from->b; \
284 \
285 if (cdelta##x[0] < 0) { \
286 cdelta##x[0] = -cdelta##x[0]; \
287 inc##x[0] = -1; \
288 } else \
289 inc##x[0] = 1; \
290 if (cdelta##x[1] < 0) { \
291 cdelta##x[1] = -cdelta##x[1]; \
292 inc##x[1] = -1; \
293 } else \
294 inc##x[1] = 1; \
295 if (cdelta##x[2] < 0) { \
296 cdelta##x[2] = -cdelta##x[2]; \
297 inc##x[2] = -1; \
298 } else \
299 inc##x[2] = 1; \
300 bigslope##x[0] = cdelta##x[0] > w;\
301 bigslope##x[1] = cdelta##x[1] > w;\
302 bigslope##x[2] = cdelta##x[2] > w
303
304 #define COLOR_RR(x, c) \
305 c->r = color##x[0]; \
306 c->g = color##x[1]; \
307 c->b = color##x[2]
308
309 #define COLOR(x) \
310 ((color##x[0] << RrDefaultRedOffset) + \
311 (color##x[1] << RrDefaultGreenOffset) + \
312 (color##x[2] << RrDefaultBlueOffset))
313
314 #define INCREMENT(x, i) \
315 (inc##x[i])
316
317 #define NEXT(x) \
318 { \
319 int i; \
320 for (i = 2; i >= 0; --i) { \
321 if (!cdelta##x[i]) continue; \
322 \
323 if (!bigslope##x[i]) { \
324 /* Y (color) is dependant on X */ \
325 error##x[i] += cdelta##x[i]; \
326 if ((error##x[i] << 1) >= len##x) { \
327 color##x[i] += INCREMENT(x, i); \
328 error##x[i] -= len##x; \
329 } \
330 } else { \
331 /* X is dependant on Y (color) */ \
332 while (1) { \
333 color##x[i] += INCREMENT(x, i); \
334 error##x[i] += len##x; \
335 if ((error##x[i] << 1) >= cdelta##x[i]) { \
336 error##x[i] -= cdelta##x[i]; \
337 break; \
338 } \
339 } \
340 } \
341 } \
342 }
343
344 static void gradient_horizontal(RrSurface *sf, int w, int h)
345 {
346 int x, y;
347 RrPixel32 *data = sf->pixel_data, *datav;
348 RrPixel32 current;
349
350 VARS(x);
351 SETUP(x, sf->primary, sf->secondary, w);
352
353 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
354 current = COLOR(x);
355 datav = data;
356 for (y = h - 1; y >= 0; --y) { /* 0 -> h */
357 *datav = current;
358 datav += w;
359 }
360 ++data;
361
362 NEXT(x);
363 }
364 current = COLOR(x);
365 for (y = h - 1; y >= 0; --y) /* 0 -> h */
366 *(data + y * w) = current;
367 }
368
369 static void gradient_vertical(RrSurface *sf, int w, int h)
370 {
371 int x, y;
372 RrPixel32 *data = sf->pixel_data;
373 RrPixel32 current;
374
375 VARS(y);
376 SETUP(y, sf->primary, sf->secondary, h);
377
378 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
379 current = COLOR(y);
380 for (x = w - 1; x >= 0; --x) /* 0 -> w */
381 *(data++) = current;
382
383 NEXT(y);
384 }
385 current = COLOR(y);
386 for (x = w - 1; x >= 0; --x) /* 0 -> w */
387 *(data++) = current;
388 }
389
390
391 static void gradient_diagonal(RrSurface *sf, int w, int h)
392 {
393 int x, y;
394 RrPixel32 *data = sf->pixel_data;
395 RrColor left, right;
396 RrColor extracorner;
397
398 VARS(lefty);
399 VARS(righty);
400 VARS(x);
401
402 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
403 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
404 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
405
406 SETUP(lefty, sf->primary, (&extracorner), h);
407 SETUP(righty, (&extracorner), sf->secondary, h);
408
409 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
410 COLOR_RR(lefty, (&left));
411 COLOR_RR(righty, (&right));
412
413 SETUP(x, (&left), (&right), w);
414
415 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
416 *(data++) = COLOR(x);
417
418 NEXT(x);
419 }
420 *(data++) = COLOR(x);
421
422 NEXT(lefty);
423 NEXT(righty);
424 }
425 COLOR_RR(lefty, (&left));
426 COLOR_RR(righty, (&right));
427
428 SETUP(x, (&left), (&right), w);
429
430 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
431 *(data++) = COLOR(x);
432
433 NEXT(x);
434 }
435 *data = COLOR(x);
436 }
437
438 static void gradient_crossdiagonal(RrSurface *sf, int w, int h)
439 {
440 int x, y;
441 RrPixel32 *data = sf->pixel_data;
442 RrColor left, right;
443 RrColor extracorner;
444
445 VARS(lefty);
446 VARS(righty);
447 VARS(x);
448
449 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
450 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
451 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
452
453 SETUP(lefty, (&extracorner), sf->secondary, h);
454 SETUP(righty, sf->primary, (&extracorner), h);
455
456 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
457 COLOR_RR(lefty, (&left));
458 COLOR_RR(righty, (&right));
459
460 SETUP(x, (&left), (&right), w);
461
462 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
463 *(data++) = COLOR(x);
464
465 NEXT(x);
466 }
467 *(data++) = COLOR(x);
468
469 NEXT(lefty);
470 NEXT(righty);
471 }
472 COLOR_RR(lefty, (&left));
473 COLOR_RR(righty, (&right));
474
475 SETUP(x, (&left), (&right), w);
476
477 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
478 *(data++) = COLOR(x);
479
480 NEXT(x);
481 }
482 *data = COLOR(x);
483 }
484
485 static void gradient_pyramid(RrSurface *sf, int inw, int inh)
486 {
487 int x, y, w = (inw >> 1) + 1, h = (inh >> 1) + 1;
488 RrPixel32 *data = sf->pixel_data;
489 RrPixel32 *end = data + inw*inh - 1;
490 RrPixel32 current;
491 RrColor left, right;
492 RrColor extracorner;
493
494 VARS(lefty);
495 VARS(righty);
496 VARS(x);
497
498 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
499 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
500 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
501
502 SETUP(lefty, (&extracorner), sf->secondary, h);
503 SETUP(righty, sf->primary, (&extracorner), h);
504
505 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
506 COLOR_RR(lefty, (&left));
507 COLOR_RR(righty, (&right));
508
509 SETUP(x, (&left), (&right), w);
510
511 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
512 current = COLOR(x);
513 *(data+x) = current;
514 *(data+inw-x) = current;
515 *(end-x) = current;
516 *(end-(inw-x)) = current;
517
518 NEXT(x);
519 }
520 current = COLOR(x);
521 *(data+x) = current;
522 *(data+inw-x) = current;
523 *(end-x) = current;
524 *(end-(inw-x)) = current;
525
526 data+=inw;
527 end-=inw;
528
529 NEXT(lefty);
530 NEXT(righty);
531 }
532 COLOR_RR(lefty, (&left));
533 COLOR_RR(righty, (&right));
534
535 SETUP(x, (&left), (&right), w);
536
537 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
538 current = COLOR(x);
539 *(data+x) = current;
540 *(data+inw-x) = current;
541 *(end-x) = current;
542 *(end-(inw-x)) = current;
543
544 NEXT(x);
545 }
546 current = COLOR(x);
547 *(data+x) = current;
548 *(data+inw-x) = current;
549 *(end-x) = current;
550 *(end-(inw-x)) = current;
551 }
552
my patches for the openbox window manager
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