1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
3 gradient.c for the Openbox window manager
4 Copyright (c) 2003 Ben Jansens
5 Copyright (c) 2003 Derek Foreman
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 See the COPYING file for a copy of the GNU General Public License.
25 static void highlight(RrPixel32 *x, RrPixel32 *y, gboolean raised);
26 static void gradient_solid(RrAppearance *l, int w, int h);
27 static void gradient_vertical(RrSurface *sf, int w, int h);
28 static void gradient_horizontal(RrSurface *sf, int w, int h);
29 static void gradient_diagonal(RrSurface *sf, int w, int h);
30 static void gradient_crossdiagonal(RrSurface *sf, int w, int h);
31 static void gradient_pyramid(RrSurface *sf, int inw, int inh);
33 void RrRender(RrAppearance *a, int w, int h)
35 RrPixel32 *data = a->surface.pixel_data;
40 switch (a->surface.grad) {
41 case RR_SURFACE_SOLID:
42 gradient_solid(a, w, h);
44 case RR_SURFACE_VERTICAL:
45 gradient_vertical(&a->surface, w, h);
47 case RR_SURFACE_HORIZONTAL:
48 gradient_horizontal(&a->surface, w, h);
50 case RR_SURFACE_DIAGONAL:
51 gradient_diagonal(&a->surface, w, h);
53 case RR_SURFACE_CROSS_DIAGONAL:
54 gradient_crossdiagonal(&a->surface, w, h);
56 case RR_SURFACE_PYRAMID:
57 gradient_pyramid(&a->surface, w, h);
60 g_assert_not_reached(); /* unhandled gradient */
64 if (a->surface.interlaced) {
68 r = a->surface.interlace_color->r;
69 g = a->surface.interlace_color->g;
70 b = a->surface.interlace_color->b;
71 current = (r << RrDefaultRedOffset)
72 + (g << RrDefaultGreenOffset)
73 + (b << RrDefaultBlueOffset);
75 for (i = 0; i < h; i += 2, p += w)
76 for (x = 0; x < w; ++x, ++p)
80 if (a->surface.relief == RR_RELIEF_FLAT && a->surface.border) {
81 r = a->surface.border_color->r;
82 g = a->surface.border_color->g;
83 b = a->surface.border_color->b;
84 current = (r << RrDefaultRedOffset)
85 + (g << RrDefaultGreenOffset)
86 + (b << RrDefaultBlueOffset);
87 for (off = 0, x = 0; x < w; ++x, off++) {
88 *(data + off) = current;
89 *(data + off + ((h-1) * w)) = current;
91 for (off = 0, x = 0; x < h; ++x, off++) {
92 *(data + (off * w)) = current;
93 *(data + (off * w) + w - 1) = current;
97 if (a->surface.relief != RR_RELIEF_FLAT) {
98 if (a->surface.bevel == RR_BEVEL_1) {
99 for (off = 1, x = 1; x < w - 1; ++x, off++)
100 highlight(data + off,
101 data + off + (h-1) * w,
102 a->surface.relief==RR_RELIEF_RAISED);
103 for (off = 0, x = 0; x < h; ++x, off++)
104 highlight(data + off * w,
105 data + off * w + w - 1,
106 a->surface.relief==RR_RELIEF_RAISED);
109 if (a->surface.bevel == RR_BEVEL_2) {
110 for (off = 2, x = 2; x < w - 2; ++x, off++)
111 highlight(data + off + w,
112 data + off + (h-2) * w,
113 a->surface.relief==RR_RELIEF_RAISED);
114 for (off = 1, x = 1; x < h-1; ++x, off++)
115 highlight(data + off * w + 1,
116 data + off * w + w - 2,
117 a->surface.relief==RR_RELIEF_RAISED);
122 static void highlight(RrPixel32 *x, RrPixel32 *y, gboolean raised)
126 RrPixel32 *up, *down;
134 r = (*up >> RrDefaultRedOffset) & 0xFF;
136 g = (*up >> RrDefaultGreenOffset) & 0xFF;
138 b = (*up >> RrDefaultBlueOffset) & 0xFF;
140 if (r > 0xFF) r = 0xFF;
141 if (g > 0xFF) g = 0xFF;
142 if (b > 0xFF) b = 0xFF;
143 *up = (r << RrDefaultRedOffset) + (g << RrDefaultGreenOffset)
144 + (b << RrDefaultBlueOffset);
146 r = (*down >> RrDefaultRedOffset) & 0xFF;
147 r = (r >> 1) + (r >> 2);
148 g = (*down >> RrDefaultGreenOffset) & 0xFF;
149 g = (g >> 1) + (g >> 2);
150 b = (*down >> RrDefaultBlueOffset) & 0xFF;
151 b = (b >> 1) + (b >> 2);
152 *down = (r << RrDefaultRedOffset) + (g << RrDefaultGreenOffset)
153 + (b << RrDefaultBlueOffset);
156 static void create_bevel_colors(RrAppearance *l)
161 r = l->surface.primary->r;
163 g = l->surface.primary->g;
165 b = l->surface.primary->b;
167 if (r > 0xFF) r = 0xFF;
168 if (g > 0xFF) g = 0xFF;
169 if (b > 0xFF) b = 0xFF;
170 g_assert(!l->surface.bevel_light);
171 l->surface.bevel_light = RrColorNew(l->inst, r, g, b);
174 r = l->surface.primary->r;
175 r = (r >> 1) + (r >> 2);
176 g = l->surface.primary->g;
177 g = (g >> 1) + (g >> 2);
178 b = l->surface.primary->b;
179 b = (b >> 1) + (b >> 2);
180 g_assert(!l->surface.bevel_dark);
181 l->surface.bevel_dark = RrColorNew(l->inst, r, g, b);
184 static void gradient_solid(RrAppearance *l, int w, int h)
188 RrSurface *sp = &l->surface;
189 int left = 0, top = 0, right = w - 1, bottom = h - 1;
191 pix = (sp->primary->r << RrDefaultRedOffset)
192 + (sp->primary->g << RrDefaultGreenOffset)
193 + (sp->primary->b << RrDefaultBlueOffset);
195 for (a = 0; a < w; a++)
196 for (b = 0; b < h; b++)
197 sp->pixel_data[a + b * w] = pix;
199 XFillRectangle(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->primary),
202 if (sp->interlaced) {
203 for (i = 0; i < h; i += 2)
204 XDrawLine(RrDisplay(l->inst), l->pixmap,
205 RrColorGC(sp->interlace_color),
209 switch (sp->relief) {
210 case RR_RELIEF_RAISED:
212 create_bevel_colors(l);
216 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
217 left, bottom, right, bottom);
218 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
219 right, bottom, right, top);
221 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
222 left, top, right, top);
223 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
224 left, bottom, left, top);
227 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
228 left + 1, bottom - 2, right - 2, bottom - 2);
229 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
230 right - 2, bottom - 2, right - 2, top + 1);
232 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
233 left + 1, top + 1, right - 2, top + 1);
234 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
235 left + 1, bottom - 2, left + 1, top + 1);
238 g_assert_not_reached(); /* unhandled BevelType */
241 case RR_RELIEF_SUNKEN:
243 create_bevel_colors(l);
247 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
248 left, bottom, right, bottom);
249 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
250 right, bottom, right, top);
252 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
253 left, top, right, top);
254 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
255 left, bottom, left, top);
258 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
259 left + 1, bottom - 2, right - 2, bottom - 2);
260 XDrawLine(RrDisplay(l->inst), l->pixmap,RrColorGC(sp->bevel_light),
261 right - 2, bottom - 2, right - 2, top + 1);
263 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
264 left + 1, top + 1, right - 2, top + 1);
265 XDrawLine(RrDisplay(l->inst), l->pixmap, RrColorGC(sp->bevel_dark),
266 left + 1, bottom - 2, left + 1, top + 1);
270 g_assert_not_reached(); /* unhandled BevelType */
275 XDrawRectangle(RrDisplay(l->inst), l->pixmap,
276 RrColorGC(sp->border_color),
277 left, top, right, bottom);
281 g_assert_not_reached(); /* unhandled ReliefType */
285 /* * * * * * * * * * * * * * GRADIENT MAGIC WOOT * * * * * * * * * * * * * * */
288 unsigned int color##x[3]; \
289 int len##x, cdelta##x[3], error##x[3] = { 0, 0, 0 }, inc##x[3]; \
290 gboolean bigslope##x[3] /* color slope > 1 */
292 #define SETUP(x, from, to, w) \
295 color##x[0] = from->r; \
296 color##x[1] = from->g; \
297 color##x[2] = from->b; \
299 cdelta##x[0] = to->r - from->r; \
300 cdelta##x[1] = to->g - from->g; \
301 cdelta##x[2] = to->b - from->b; \
303 if (cdelta##x[0] < 0) { \
304 cdelta##x[0] = -cdelta##x[0]; \
308 if (cdelta##x[1] < 0) { \
309 cdelta##x[1] = -cdelta##x[1]; \
313 if (cdelta##x[2] < 0) { \
314 cdelta##x[2] = -cdelta##x[2]; \
318 bigslope##x[0] = cdelta##x[0] > w;\
319 bigslope##x[1] = cdelta##x[1] > w;\
320 bigslope##x[2] = cdelta##x[2] > w
322 #define COLOR_RR(x, c) \
323 c->r = color##x[0]; \
324 c->g = color##x[1]; \
328 ((color##x[0] << RrDefaultRedOffset) + \
329 (color##x[1] << RrDefaultGreenOffset) + \
330 (color##x[2] << RrDefaultBlueOffset))
332 #define INCREMENT(x, i) \
338 for (i = 2; i >= 0; --i) { \
339 if (!cdelta##x[i]) continue; \
341 if (!bigslope##x[i]) { \
342 /* Y (color) is dependant on X */ \
343 error##x[i] += cdelta##x[i]; \
344 if ((error##x[i] << 1) >= len##x) { \
345 color##x[i] += INCREMENT(x, i); \
346 error##x[i] -= len##x; \
349 /* X is dependant on Y (color) */ \
351 color##x[i] += INCREMENT(x, i); \
352 error##x[i] += len##x; \
353 if ((error##x[i] << 1) >= cdelta##x[i]) { \
354 error##x[i] -= cdelta##x[i]; \
362 static void gradient_horizontal(RrSurface *sf, int w, int h)
365 RrPixel32 *data = sf->pixel_data, *datav;
369 SETUP(x, sf->primary, sf->secondary, w);
371 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
374 for (y = h - 1; y >= 0; --y) { /* 0 -> h */
383 for (y = h - 1; y >= 0; --y) /* 0 -> h */
384 *(data + y * w) = current;
387 static void gradient_vertical(RrSurface *sf, int w, int h)
390 RrPixel32 *data = sf->pixel_data;
394 SETUP(y, sf->primary, sf->secondary, h);
396 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
398 for (x = w - 1; x >= 0; --x) /* 0 -> w */
404 for (x = w - 1; x >= 0; --x) /* 0 -> w */
409 static void gradient_diagonal(RrSurface *sf, int w, int h)
412 RrPixel32 *data = sf->pixel_data;
420 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
421 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
422 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
424 SETUP(lefty, sf->primary, (&extracorner), h);
425 SETUP(righty, (&extracorner), sf->secondary, h);
427 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
428 COLOR_RR(lefty, (&left));
429 COLOR_RR(righty, (&right));
431 SETUP(x, (&left), (&right), w);
433 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
434 *(data++) = COLOR(x);
438 *(data++) = COLOR(x);
443 COLOR_RR(lefty, (&left));
444 COLOR_RR(righty, (&right));
446 SETUP(x, (&left), (&right), w);
448 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
449 *(data++) = COLOR(x);
456 static void gradient_crossdiagonal(RrSurface *sf, int w, int h)
459 RrPixel32 *data = sf->pixel_data;
467 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
468 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
469 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
471 SETUP(lefty, (&extracorner), sf->secondary, h);
472 SETUP(righty, sf->primary, (&extracorner), h);
474 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
475 COLOR_RR(lefty, (&left));
476 COLOR_RR(righty, (&right));
478 SETUP(x, (&left), (&right), w);
480 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
481 *(data++) = COLOR(x);
485 *(data++) = COLOR(x);
490 COLOR_RR(lefty, (&left));
491 COLOR_RR(righty, (&right));
493 SETUP(x, (&left), (&right), w);
495 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
496 *(data++) = COLOR(x);
503 static void gradient_pyramid(RrSurface *sf, int inw, int inh)
505 int x, y, w = (inw >> 1) + 1, h = (inh >> 1) + 1;
506 RrPixel32 *data = sf->pixel_data;
507 RrPixel32 *end = data + inw*inh - 1;
516 extracorner.r = (sf->primary->r + sf->secondary->r) / 2;
517 extracorner.g = (sf->primary->g + sf->secondary->g) / 2;
518 extracorner.b = (sf->primary->b + sf->secondary->b) / 2;
520 SETUP(lefty, (&extracorner), sf->secondary, h);
521 SETUP(righty, sf->primary, (&extracorner), h);
523 for (y = h - 1; y > 0; --y) { /* 0 -> h-1 */
524 COLOR_RR(lefty, (&left));
525 COLOR_RR(righty, (&right));
527 SETUP(x, (&left), (&right), w);
529 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
532 *(data+inw-x) = current;
534 *(end-(inw-x)) = current;
540 *(data+inw-x) = current;
542 *(end-(inw-x)) = current;
550 COLOR_RR(lefty, (&left));
551 COLOR_RR(righty, (&right));
553 SETUP(x, (&left), (&right), w);
555 for (x = w - 1; x > 0; --x) { /* 0 -> w-1 */
558 *(data+inw-x) = current;
560 *(end-(inw-x)) = current;
566 *(data+inw-x) = current;
568 *(end-(inw-x)) = current;