1 /*
2 * art_render.c: Modular rendering architecture.
3 *
4 * Libart_LGPL - library of basic graphic primitives
5 * Copyright (C) 2000 Raph Levien
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library 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 GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
21 */
22
23 #include "config.h"
24 #include "art_render.h"
25
26 #include "art_rgb.h"
27
28 typedef struct _ArtRenderPriv ArtRenderPriv;
29
30 struct _ArtRenderPriv {
31 ArtRender super;
32
33 ArtImageSource *image_source;
34
35 int n_mask_source;
36 ArtMaskSource **mask_source;
37
38 int n_callbacks;
39 ArtRenderCallback **callbacks;
40 };
41
42 ArtRender *
art_render_new(int x0,int y0,int x1,int y1,art_u8 * pixels,int rowstride,int n_chan,int depth,ArtAlphaType alpha_type,ArtAlphaGamma * alphagamma)43 art_render_new (int x0, int y0, int x1, int y1,
44 art_u8 *pixels, int rowstride,
45 int n_chan, int depth, ArtAlphaType alpha_type,
46 ArtAlphaGamma *alphagamma)
47 {
48 ArtRenderPriv *priv;
49 ArtRender *result;
50
51 priv = art_new (ArtRenderPriv, 1);
52 result = &priv->super;
53
54 if (n_chan > ART_MAX_CHAN)
55 {
56 art_warn ("art_render_new: n_chan = %d, exceeds %d max\n",
57 n_chan, ART_MAX_CHAN);
58 return NULL;
59 }
60 if (depth > ART_MAX_DEPTH)
61 {
62 art_warn ("art_render_new: depth = %d, exceeds %d max\n",
63 depth, ART_MAX_DEPTH);
64 return NULL;
65 }
66 if (x0 >= x1)
67 {
68 art_warn ("art_render_new: x0 >= x1 (x0 = %d, x1 = %d)\n", x0, x1);
69 return NULL;
70 }
71 result->x0 = x0;
72 result->y0 = y0;
73 result->x1 = x1;
74 result->y1 = y1;
75 result->pixels = pixels;
76 result->rowstride = rowstride;
77 result->n_chan = n_chan;
78 result->depth = depth;
79 result->alpha_type = alpha_type;
80
81 result->clear = ART_FALSE;
82 result->opacity = 0x10000;
83 result->compositing_mode = ART_COMPOSITE_NORMAL;
84 result->alphagamma = alphagamma;
85
86 result->alpha_buf = NULL;
87 result->image_buf = NULL;
88
89 result->run = NULL;
90 result->span_x = NULL;
91
92 result->need_span = ART_FALSE;
93
94 priv->image_source = NULL;
95
96 priv->n_mask_source = 0;
97 priv->mask_source = NULL;
98
99 return result;
100 }
101
102 /* todo on clear routines: I haven't really figured out what to do
103 with clearing the alpha channel. It _should_ be possible to clear
104 to an arbitrary RGBA color. */
105
106 /**
107 * art_render_clear: Set clear color.
108 * @clear_color: Color with which to clear dest.
109 *
110 * Sets clear color, equivalent to actually clearing the destination
111 * buffer before rendering. This is the most general form.
112 **/
113 void
art_render_clear(ArtRender * render,const ArtPixMaxDepth * clear_color)114 art_render_clear (ArtRender *render, const ArtPixMaxDepth *clear_color)
115 {
116 int i;
117 int n_ch = render->n_chan + (render->alpha_type != ART_ALPHA_NONE);
118
119 render->clear = ART_TRUE;
120 for (i = 0; i < n_ch; i++)
121 render->clear_color[i] = clear_color[i];
122 }
123
124 /**
125 * art_render_clear_rgb: Set clear color, given in RGB format.
126 * @clear_rgb: Clear color, in 0xRRGGBB format.
127 *
128 * Sets clear color, equivalent to actually clearing the destination
129 * buffer before rendering.
130 **/
131 void
art_render_clear_rgb(ArtRender * render,art_u32 clear_rgb)132 art_render_clear_rgb (ArtRender *render, art_u32 clear_rgb)
133 {
134 if (render->n_chan != 3)
135 art_warn ("art_render_clear_rgb: called on render with %d channels, only works with 3\n",
136 render->n_chan);
137 else
138 {
139 int r, g, b;
140
141 render->clear = ART_TRUE;
142 r = clear_rgb >> 16;
143 g = (clear_rgb >> 8) & 0xff;
144 b = clear_rgb & 0xff;
145 render->clear_color[0] = ART_PIX_MAX_FROM_8(r);
146 render->clear_color[1] = ART_PIX_MAX_FROM_8(g);
147 render->clear_color[2] = ART_PIX_MAX_FROM_8(b);
148 }
149 }
150
151 static void
art_render_nop_done(ArtRenderCallback * self,ArtRender * render)152 art_render_nop_done (ArtRenderCallback *self, ArtRender *render)
153 {
154 }
155
156 static void
art_render_clear_render_rgb8(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)157 art_render_clear_render_rgb8 (ArtRenderCallback *self, ArtRender *render,
158 art_u8 *dest, int y)
159 {
160 int width = render->x1 - render->x0;
161 art_u8 r, g, b;
162 ArtPixMaxDepth color_max;
163
164 color_max = render->clear_color[0];
165 r = ART_PIX_8_FROM_MAX (color_max);
166 color_max = render->clear_color[1];
167 g = ART_PIX_8_FROM_MAX (color_max);
168 color_max = render->clear_color[2];
169 b = ART_PIX_8_FROM_MAX (color_max);
170
171 art_rgb_fill_run (dest, r, g, b, width);
172 }
173
174 static void
art_render_clear_render_8(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)175 art_render_clear_render_8 (ArtRenderCallback *self, ArtRender *render,
176 art_u8 *dest, int y)
177 {
178 int width = render->x1 - render->x0;
179 int i, j;
180 int n_ch = render->n_chan + (render->alpha_type != ART_ALPHA_NONE);
181 int ix;
182 art_u8 color[ART_MAX_CHAN + 1];
183
184 for (j = 0; j < n_ch; j++)
185 {
186 ArtPixMaxDepth color_max = render->clear_color[j];
187 color[j] = ART_PIX_8_FROM_MAX (color_max);
188 }
189
190 ix = 0;
191 for (i = 0; i < width; i++)
192 for (j = 0; j < n_ch; j++)
193 dest[ix++] = color[j];
194 }
195
196 const ArtRenderCallback art_render_clear_rgb8_obj =
197 {
198 art_render_clear_render_rgb8,
199 art_render_nop_done
200 };
201
202 const ArtRenderCallback art_render_clear_8_obj =
203 {
204 art_render_clear_render_8,
205 art_render_nop_done
206 };
207
208 #if ART_MAX_DEPTH >= 16
209
210 static void
art_render_clear_render_16(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)211 art_render_clear_render_16 (ArtRenderCallback *self, ArtRender *render,
212 art_u8 *dest, int y)
213 {
214 int width = render->x1 - render->x0;
215 int i, j;
216 int n_ch = render->n_chan + (render->alpha_type != ART_ALPHA_NONE);
217 int ix;
218 art_u16 *dest_16 = (art_u16 *)dest;
219 art_u8 color[ART_MAX_CHAN + 1];
220
221 for (j = 0; j < n_ch; j++)
222 {
223 int color_16 = render->clear_color[j];
224 color[j] = color_16;
225 }
226
227 ix = 0;
228 for (i = 0; i < width; i++)
229 for (j = 0; j < n_ch; j++)
230 dest_16[ix++] = color[j];
231 }
232
233 const ArtRenderCallback art_render_clear_16_obj =
234 {
235 art_render_clear_render_16,
236 art_render_nop_done
237 };
238
239 #endif /* ART_MAX_DEPTH >= 16 */
240
241 /* todo: inline */
242 static ArtRenderCallback *
art_render_choose_clear_callback(ArtRender * render)243 art_render_choose_clear_callback (ArtRender *render)
244 {
245 ArtRenderCallback *clear_callback;
246
247 if (render->depth == 8)
248 {
249 if (render->n_chan == 3 &&
250 render->alpha_type == ART_ALPHA_NONE)
251 clear_callback = (ArtRenderCallback *)&art_render_clear_rgb8_obj;
252 else
253 clear_callback = (ArtRenderCallback *)&art_render_clear_8_obj;
254 }
255 #if ART_MAX_DEPTH >= 16
256 else if (render->depth == 16)
257 clear_callback = (ArtRenderCallback *)&art_render_clear_16_obj;
258 #endif
259 else
260 {
261 art_die ("art_render_choose_clear_callback: inconsistent render->depth = %d\n",
262 render->depth);
263 }
264 return clear_callback;
265 }
266
267 #if 0
268 /* todo: get around to writing this */
269 static void
270 art_render_composite_render_noa_8_norm (ArtRenderCallback *self, ArtRender *render,
271 art_u8 *dest, int y)
272 {
273 int width = render->x1 - render->x0;
274
275 }
276 #endif
277
278 /* This is the most general form of the function. It is slow but
279 (hopefully) correct. Actually, I'm still worried about roundoff
280 errors in the premul case - it seems to me that an off-by-one could
281 lead to overflow. */
282 static void
art_render_composite(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)283 art_render_composite (ArtRenderCallback *self, ArtRender *render,
284 art_u8 *dest, int y)
285 {
286 ArtRenderMaskRun *run = render->run;
287 art_u32 depth = render->depth;
288 int n_run = render->n_run;
289 int x0 = render->x0;
290 int x;
291 int run_x0, run_x1;
292 art_u8 *alpha_buf = render->alpha_buf;
293 art_u8 *image_buf = render->image_buf;
294 int i, j;
295 art_u32 tmp;
296 art_u32 run_alpha;
297 art_u32 alpha;
298 int image_ix;
299 art_u16 src[ART_MAX_CHAN + 1];
300 art_u16 dst[ART_MAX_CHAN + 1];
301 int n_chan = render->n_chan;
302 ArtAlphaType alpha_type = render->alpha_type;
303 int n_ch = n_chan + (alpha_type != ART_ALPHA_NONE);
304 int dst_pixstride = n_ch * (depth >> 3);
305 int buf_depth = render->buf_depth;
306 ArtAlphaType buf_alpha = render->buf_alpha;
307 int buf_n_ch = n_chan + (buf_alpha != ART_ALPHA_NONE);
308 int buf_pixstride = buf_n_ch * (buf_depth >> 3);
309 art_u8 *bufptr;
310 art_u32 src_alpha;
311 art_u32 src_mul;
312 art_u8 *dstptr;
313 art_u32 dst_alpha;
314 art_u32 dst_mul;
315
316 image_ix = 0;
317 for (i = 0; i < n_run - 1; i++)
318 {
319 run_x0 = run[i].x;
320 run_x1 = run[i + 1].x;
321 tmp = run[i].alpha;
322 if (tmp < 0x8100)
323 continue;
324
325 run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
326 bufptr = image_buf + (run_x0 - x0) * buf_pixstride;
327 dstptr = dest + (run_x0 - x0) * dst_pixstride;
328 for (x = run_x0; x < run_x1; x++)
329 {
330 if (alpha_buf)
331 {
332 if (depth == 8)
333 {
334 tmp = run_alpha * alpha_buf[x - x0] + 0x80;
335 /* range 0x80 .. 0xff0080 */
336 alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
337 }
338 else /* (depth == 16) */
339 {
340 tmp = ((art_u16 *)alpha_buf)[x - x0];
341 tmp = (run_alpha * tmp + 0x8000) >> 8;
342 /* range 0x80 .. 0xffff80 */
343 alpha = (tmp + (tmp >> 16)) >> 8;
344 }
345 }
346 else
347 alpha = run_alpha;
348 /* alpha is run_alpha * alpha_buf[x], range 0 .. 0x10000 */
349
350 /* convert (src pixel * alpha) to premul alpha form,
351 store in src as 0..0xffff range */
352 if (buf_alpha == ART_ALPHA_NONE)
353 {
354 src_alpha = alpha;
355 src_mul = src_alpha;
356 }
357 else
358 {
359 if (buf_depth == 8)
360 {
361 tmp = alpha * bufptr[n_chan] + 0x80;
362 /* range 0x80 .. 0xff0080 */
363 src_alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
364 }
365 else /* (depth == 16) */
366 {
367 tmp = ((art_u16 *)bufptr)[n_chan];
368 tmp = (alpha * tmp + 0x8000) >> 8;
369 /* range 0x80 .. 0xffff80 */
370 src_alpha = (tmp + (tmp >> 16)) >> 8;
371 }
372 if (buf_alpha == ART_ALPHA_SEPARATE)
373 src_mul = src_alpha;
374 else /* buf_alpha == (ART_ALPHA_PREMUL) */
375 src_mul = alpha;
376 }
377 /* src_alpha is the (alpha of the source pixel * alpha),
378 range 0..0x10000 */
379
380 if (buf_depth == 8)
381 {
382 src_mul *= 0x101;
383 for (j = 0; j < n_chan; j++)
384 src[j] = (bufptr[j] * src_mul + 0x8000) >> 16;
385 }
386 else if (buf_depth == 16)
387 {
388 for (j = 0; j < n_chan; j++)
389 src[j] = (((art_u16 *)bufptr)[j] * src_mul + 0x8000) >> 16;
390 }
391 bufptr += buf_pixstride;
392
393 /* src[0..n_chan - 1] (range 0..0xffff) and src_alpha (range
394 0..0x10000) now contain the source pixel with
395 premultiplied alpha */
396
397 /* convert dst pixel to premul alpha form,
398 store in dst as 0..0xffff range */
399 if (alpha_type == ART_ALPHA_NONE)
400 {
401 dst_alpha = 0x10000;
402 dst_mul = dst_alpha;
403 }
404 else
405 {
406 if (depth == 8)
407 {
408 tmp = dstptr[n_chan];
409 /* range 0..0xff */
410 dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
411 }
412 else /* (depth == 16) */
413 {
414 tmp = ((art_u16 *)dstptr)[n_chan];
415 dst_alpha = (tmp + (tmp >> 15));
416 }
417 if (alpha_type == ART_ALPHA_SEPARATE)
418 dst_mul = dst_alpha;
419 else /* (alpha_type == ART_ALPHA_PREMUL) */
420 dst_mul = 0x10000;
421 }
422 /* dst_alpha is the alpha of the dest pixel,
423 range 0..0x10000 */
424
425 if (depth == 8)
426 {
427 dst_mul *= 0x101;
428 for (j = 0; j < n_chan; j++)
429 dst[j] = (dstptr[j] * dst_mul + 0x8000) >> 16;
430 }
431 else if (buf_depth == 16)
432 {
433 for (j = 0; j < n_chan; j++)
434 dst[j] = (((art_u16 *)dstptr)[j] * dst_mul + 0x8000) >> 16;
435 }
436
437 /* do the compositing, dst = (src over dst) */
438 for (j = 0; j < n_chan; j++)
439 {
440 art_u32 srcv, dstv;
441 art_u32 tmp;
442
443 srcv = src[j];
444 dstv = dst[j];
445 tmp = ((dstv * (0x10000 - src_alpha) + 0x8000) >> 16) + srcv;
446 tmp -= tmp >> 16;
447 dst[j] = tmp;
448 }
449
450 if (alpha_type == ART_ALPHA_NONE)
451 {
452 if (depth == 8)
453 dst_mul = 0xff;
454 else /* (depth == 16) */
455 dst_mul = 0xffff;
456 }
457 else
458 {
459 if (src_alpha >= 0x10000)
460 dst_alpha = 0x10000;
461 else
462 dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
463 if (alpha_type == ART_ALPHA_PREMUL || dst_alpha == 0)
464 {
465 if (depth == 8)
466 dst_mul = 0xff;
467 else /* (depth == 16) */
468 dst_mul = 0xffff;
469 }
470 else /* (ALPHA_TYPE == ART_ALPHA_SEPARATE && dst_alpha != 0) */
471 {
472 if (depth == 8)
473 dst_mul = 0xff0000 / dst_alpha;
474 else /* (depth == 16) */
475 dst_mul = 0xffff0000 / dst_alpha;
476 }
477 }
478 if (depth == 8)
479 {
480 for (j = 0; j < n_chan; j++)
481 dstptr[j] = (dst[j] * dst_mul + 0x8000) >> 16;
482 if (alpha_type != ART_ALPHA_NONE)
483 dstptr[n_chan] = (dst_alpha * 0xff + 0x8000) >> 16;
484 }
485 else if (depth == 16)
486 {
487 for (j = 0; j < n_chan; j++)
488 ((art_u16 *)dstptr)[j] = (dst[j] * dst_mul + 0x8000) >> 16;
489 if (alpha_type != ART_ALPHA_NONE)
490 ((art_u16 *)dstptr)[n_chan] = (dst_alpha * 0xffff + 0x8000) >> 16;
491 }
492 dstptr += dst_pixstride;
493 }
494 }
495 }
496
497 const ArtRenderCallback art_render_composite_obj =
498 {
499 art_render_composite,
500 art_render_nop_done
501 };
502
503 static void
art_render_composite_8(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)504 art_render_composite_8 (ArtRenderCallback *self, ArtRender *render,
505 art_u8 *dest, int y)
506 {
507 ArtRenderMaskRun *run = render->run;
508 int n_run = render->n_run;
509 int x0 = render->x0;
510 int x;
511 int run_x0, run_x1;
512 art_u8 *alpha_buf = render->alpha_buf;
513 art_u8 *image_buf = render->image_buf;
514 int i, j;
515 art_u32 tmp;
516 art_u32 run_alpha;
517 art_u32 alpha;
518 int image_ix;
519 int n_chan = render->n_chan;
520 ArtAlphaType alpha_type = render->alpha_type;
521 int n_ch = n_chan + (alpha_type != ART_ALPHA_NONE);
522 int dst_pixstride = n_ch;
523 ArtAlphaType buf_alpha = render->buf_alpha;
524 int buf_n_ch = n_chan + (buf_alpha != ART_ALPHA_NONE);
525 int buf_pixstride = buf_n_ch;
526 art_u8 *bufptr;
527 art_u32 src_alpha;
528 art_u32 src_mul;
529 art_u8 *dstptr;
530 art_u32 dst_alpha;
531 art_u32 dst_mul, dst_save_mul;
532
533 image_ix = 0;
534 for (i = 0; i < n_run - 1; i++)
535 {
536 run_x0 = run[i].x;
537 run_x1 = run[i + 1].x;
538 tmp = run[i].alpha;
539 if (tmp < 0x10000)
540 continue;
541
542 run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
543 bufptr = image_buf + (run_x0 - x0) * buf_pixstride;
544 dstptr = dest + (run_x0 - x0) * dst_pixstride;
545 for (x = run_x0; x < run_x1; x++)
546 {
547 if (alpha_buf)
548 {
549 tmp = run_alpha * alpha_buf[x - x0] + 0x80;
550 /* range 0x80 .. 0xff0080 */
551 alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
552 }
553 else
554 alpha = run_alpha;
555 /* alpha is run_alpha * alpha_buf[x], range 0 .. 0x10000 */
556
557 /* convert (src pixel * alpha) to premul alpha form,
558 store in src as 0..0xffff range */
559 if (buf_alpha == ART_ALPHA_NONE)
560 {
561 src_alpha = alpha;
562 src_mul = src_alpha;
563 }
564 else
565 {
566 tmp = alpha * bufptr[n_chan] + 0x80;
567 /* range 0x80 .. 0xff0080 */
568 src_alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
569
570 if (buf_alpha == ART_ALPHA_SEPARATE)
571 src_mul = src_alpha;
572 else /* buf_alpha == (ART_ALPHA_PREMUL) */
573 src_mul = alpha;
574 }
575 /* src_alpha is the (alpha of the source pixel * alpha),
576 range 0..0x10000 */
577
578 src_mul *= 0x101;
579
580 if (alpha_type == ART_ALPHA_NONE)
581 {
582 dst_alpha = 0x10000;
583 dst_mul = dst_alpha;
584 }
585 else
586 {
587 tmp = dstptr[n_chan];
588 /* range 0..0xff */
589 dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
590 if (alpha_type == ART_ALPHA_SEPARATE)
591 dst_mul = dst_alpha;
592 else /* (alpha_type == ART_ALPHA_PREMUL) */
593 dst_mul = 0x10000;
594 }
595 /* dst_alpha is the alpha of the dest pixel,
596 range 0..0x10000 */
597
598 dst_mul *= 0x101;
599
600 if (alpha_type == ART_ALPHA_NONE)
601 {
602 dst_save_mul = 0xff;
603 }
604 else
605 {
606 if (src_alpha >= 0x10000)
607 dst_alpha = 0x10000;
608 else
609 dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
610 if (alpha_type == ART_ALPHA_PREMUL || dst_alpha == 0)
611 {
612 dst_save_mul = 0xff;
613 }
614 else /* (ALPHA_TYPE == ART_ALPHA_SEPARATE && dst_alpha != 0) */
615 {
616 dst_save_mul = 0xff0000 / dst_alpha;
617 }
618 }
619
620 for (j = 0; j < n_chan; j++)
621 {
622 art_u32 src, dst;
623 art_u32 tmp;
624
625 src = (bufptr[j] * src_mul + 0x8000) >> 16;
626 dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
627 tmp = ((dst * (0x10000 - src_alpha) + 0x8000) >> 16) + src;
628 tmp -= tmp >> 16;
629 dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
630 }
631 if (alpha_type != ART_ALPHA_NONE)
632 dstptr[n_chan] = (dst_alpha * 0xff + 0x8000) >> 16;
633
634 bufptr += buf_pixstride;
635 dstptr += dst_pixstride;
636 }
637 }
638 }
639
640 const ArtRenderCallback art_render_composite_8_obj =
641 {
642 art_render_composite_8,
643 art_render_nop_done
644 };
645
646
647 /* Assumes:
648 * alpha_buf is NULL
649 * buf_alpha = ART_ALPHA_NONE (source)
650 * alpha_type = ART_ALPHA_SEPARATE (dest)
651 * n_chan = 3;
652 */
653 static void
art_render_composite_8_opt1(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)654 art_render_composite_8_opt1 (ArtRenderCallback *self, ArtRender *render,
655 art_u8 *dest, int y)
656 {
657 ArtRenderMaskRun *run = render->run;
658 int n_run = render->n_run;
659 int x0 = render->x0;
660 int x;
661 int run_x0, run_x1;
662 art_u8 *image_buf = render->image_buf;
663 int i, j;
664 art_u32 tmp;
665 art_u32 run_alpha;
666 int image_ix;
667 art_u8 *bufptr;
668 art_u32 src_mul;
669 art_u8 *dstptr;
670 art_u32 dst_alpha;
671 art_u32 dst_mul, dst_save_mul;
672
673 image_ix = 0;
674 for (i = 0; i < n_run - 1; i++)
675 {
676 run_x0 = run[i].x;
677 run_x1 = run[i + 1].x;
678 tmp = run[i].alpha;
679 if (tmp < 0x10000)
680 continue;
681
682 run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
683 bufptr = image_buf + (run_x0 - x0) * 3;
684 dstptr = dest + (run_x0 - x0) * 4;
685 if (run_alpha == 0x10000)
686 {
687 for (x = run_x0; x < run_x1; x++)
688 {
689 *dstptr++ = *bufptr++;
690 *dstptr++ = *bufptr++;
691 *dstptr++ = *bufptr++;
692 *dstptr++ = 0xff;
693 }
694 }
695 else
696 {
697 for (x = run_x0; x < run_x1; x++)
698 {
699 src_mul = run_alpha * 0x101;
700
701 tmp = dstptr[3];
702 /* range 0..0xff */
703 dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
704 dst_mul = dst_alpha;
705 /* dst_alpha is the alpha of the dest pixel,
706 range 0..0x10000 */
707
708 dst_mul *= 0x101;
709
710 dst_alpha += ((((0x10000 - dst_alpha) * run_alpha) >> 8) + 0x80) >> 8;
711 if (dst_alpha == 0)
712 dst_save_mul = 0xff;
713 else /* (dst_alpha != 0) */
714 dst_save_mul = 0xff0000 / dst_alpha;
715
716 for (j = 0; j < 3; j++)
717 {
718 art_u32 src, dst;
719 art_u32 tmp;
720
721 src = (bufptr[j] * src_mul + 0x8000) >> 16;
722 dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
723 tmp = ((dst * (0x10000 - run_alpha) + 0x8000) >> 16) + src;
724 tmp -= tmp >> 16;
725 dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
726 }
727 dstptr[3] = (dst_alpha * 0xff + 0x8000) >> 16;
728
729 bufptr += 3;
730 dstptr += 4;
731 }
732 }
733 }
734 }
735
736
737 const ArtRenderCallback art_render_composite_8_opt1_obj =
738 {
739 art_render_composite_8_opt1,
740 art_render_nop_done
741 };
742
743 /* Assumes:
744 * alpha_buf is NULL
745 * buf_alpha = ART_ALPHA_PREMUL (source)
746 * alpha_type = ART_ALPHA_SEPARATE (dest)
747 * n_chan = 3;
748 */
749 static void
art_render_composite_8_opt2(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)750 art_render_composite_8_opt2 (ArtRenderCallback *self, ArtRender *render,
751 art_u8 *dest, int y)
752 {
753 ArtRenderMaskRun *run = render->run;
754 int n_run = render->n_run;
755 int x0 = render->x0;
756 int x;
757 int run_x0, run_x1;
758 art_u8 *image_buf = render->image_buf;
759 int i, j;
760 art_u32 tmp;
761 art_u32 run_alpha;
762 int image_ix;
763 art_u8 *bufptr;
764 art_u32 src_alpha;
765 art_u32 src_mul;
766 art_u8 *dstptr;
767 art_u32 dst_alpha;
768 art_u32 dst_mul, dst_save_mul;
769
770 image_ix = 0;
771 for (i = 0; i < n_run - 1; i++)
772 {
773 run_x0 = run[i].x;
774 run_x1 = run[i + 1].x;
775 tmp = run[i].alpha;
776 if (tmp < 0x10000)
777 continue;
778
779 run_alpha = (tmp + (tmp >> 8) + (tmp >> 16) - 0x8000) >> 8; /* range [0 .. 0x10000] */
780 bufptr = image_buf + (run_x0 - x0) * 4;
781 dstptr = dest + (run_x0 - x0) * 4;
782 if (run_alpha == 0x10000)
783 {
784 for (x = run_x0; x < run_x1; x++)
785 {
786 src_alpha = (bufptr[3] << 8) + bufptr[3] + (bufptr[3] >> 7);
787 /* src_alpha is the (alpha of the source pixel),
788 range 0..0x10000 */
789
790 dst_alpha = (dstptr[3] << 8) + dstptr[3] + (dstptr[3] >> 7);
791 /* dst_alpha is the alpha of the dest pixel,
792 range 0..0x10000 */
793
794 dst_mul = dst_alpha*0x101;
795
796 if (src_alpha >= 0x10000)
797 dst_alpha = 0x10000;
798 else
799 dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
800
801 if (dst_alpha == 0)
802 dst_save_mul = 0xff;
803 else /* dst_alpha != 0) */
804 dst_save_mul = 0xff0000 / dst_alpha;
805
806 for (j = 0; j < 3; j++)
807 {
808 art_u32 src, dst;
809 art_u32 tmp;
810
811 src = (bufptr[j] << 8) | bufptr[j];
812 dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
813 tmp = ((dst * (0x10000 - src_alpha) + 0x8000) >> 16) + src;
814 tmp -= tmp >> 16;
815 dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
816 }
817 dstptr[3] = (dst_alpha * 0xff + 0x8000) >> 16;
818
819 bufptr += 4;
820 dstptr += 4;
821 }
822 }
823 else
824 {
825 for (x = run_x0; x < run_x1; x++)
826 {
827 tmp = run_alpha * bufptr[3] + 0x80;
828 /* range 0x80 .. 0xff0080 */
829 src_alpha = (tmp + (tmp >> 8) + (tmp >> 16)) >> 8;
830 /* src_alpha is the (alpha of the source pixel * alpha),
831 range 0..0x10000 */
832
833 src_mul = run_alpha * 0x101;
834
835 tmp = dstptr[3];
836 /* range 0..0xff */
837 dst_alpha = (tmp << 8) + tmp + (tmp >> 7);
838 dst_mul = dst_alpha;
839 /* dst_alpha is the alpha of the dest pixel,
840 range 0..0x10000 */
841
842 dst_mul *= 0x101;
843
844 if (src_alpha >= 0x10000)
845 dst_alpha = 0x10000;
846 else
847 dst_alpha += ((((0x10000 - dst_alpha) * src_alpha) >> 8) + 0x80) >> 8;
848
849 if (dst_alpha == 0)
850 {
851 dst_save_mul = 0xff;
852 }
853 else /* dst_alpha != 0) */
854 {
855 dst_save_mul = 0xff0000 / dst_alpha;
856 }
857
858 for (j = 0; j < 3; j++)
859 {
860 art_u32 src, dst;
861 art_u32 tmp;
862
863 src = (bufptr[j] * src_mul + 0x8000) >> 16;
864 dst = (dstptr[j] * dst_mul + 0x8000) >> 16;
865 tmp = ((dst * (0x10000 - src_alpha) + 0x8000) >> 16) + src;
866 tmp -= tmp >> 16;
867 dstptr[j] = (tmp * dst_save_mul + 0x8000) >> 16;
868 }
869 dstptr[3] = (dst_alpha * 0xff + 0x8000) >> 16;
870
871 bufptr += 4;
872 dstptr += 4;
873 }
874 }
875 }
876 }
877
878 const ArtRenderCallback art_render_composite_8_opt2_obj =
879 {
880 art_render_composite_8_opt2,
881 art_render_nop_done
882 };
883
884
885 /* todo: inline */
886 static ArtRenderCallback *
art_render_choose_compositing_callback(ArtRender * render)887 art_render_choose_compositing_callback (ArtRender *render)
888 {
889 if (render->depth == 8 && render->buf_depth == 8)
890 {
891 if (render->n_chan == 3 &&
892 render->alpha_buf == NULL &&
893 render->alpha_type == ART_ALPHA_SEPARATE)
894 {
895 if (render->buf_alpha == ART_ALPHA_NONE)
896 return (ArtRenderCallback *)&art_render_composite_8_opt1_obj;
897 else if (render->buf_alpha == ART_ALPHA_PREMUL)
898 return (ArtRenderCallback *)&art_render_composite_8_opt2_obj;
899 }
900
901 return (ArtRenderCallback *)&art_render_composite_8_obj;
902 }
903 return (ArtRenderCallback *)&art_render_composite_obj;
904 }
905
906 /**
907 * art_render_invoke_callbacks: Invoke the callbacks in the render object.
908 * @render: The render object.
909 * @y: The current Y coordinate value.
910 *
911 * Invokes the callbacks of the render object in the appropriate
912 * order. Drivers should call this routine once per scanline.
913 *
914 * todo: should management of dest devolve to this routine? very
915 * plausibly yes.
916 **/
917 void
art_render_invoke_callbacks(ArtRender * render,art_u8 * dest,int y)918 art_render_invoke_callbacks (ArtRender *render, art_u8 *dest, int y)
919 {
920 ArtRenderPriv *priv = (ArtRenderPriv *)render;
921 int i;
922
923 for (i = 0; i < priv->n_callbacks; i++)
924 {
925 ArtRenderCallback *callback;
926
927 callback = priv->callbacks[i];
928 callback->render (callback, render, dest, y);
929 }
930 }
931
932 /**
933 * art_render_invoke: Perform the requested rendering task.
934 * @render: The render object.
935 *
936 * Invokes the renderer and all sources associated with it, to perform
937 * the requested rendering task.
938 **/
939 void
art_render_invoke(ArtRender * render)940 art_render_invoke (ArtRender *render)
941 {
942 ArtRenderPriv *priv = (ArtRenderPriv *)render;
943 int width;
944 int best_driver, best_score;
945 int i;
946 int n_callbacks, n_callbacks_max;
947 ArtImageSource *image_source;
948 ArtImageSourceFlags image_flags;
949 int buf_depth;
950 ArtAlphaType buf_alpha;
951 art_boolean first = ART_TRUE;
952
953 if (render == NULL)
954 {
955 art_warn ("art_render_invoke: called with render == NULL\n");
956 return;
957 }
958 if (priv->image_source == NULL)
959 {
960 art_warn ("art_render_invoke: no image source given\n");
961 return;
962 }
963
964 width = render->x1 - render->x0;
965
966 render->run = art_new (ArtRenderMaskRun, width + 1);
967
968 /* Elect a mask source as driver. */
969 best_driver = -1;
970 best_score = 0;
971 for (i = 0; i < priv->n_mask_source; i++)
972 {
973 int score;
974 ArtMaskSource *mask_source;
975
976 mask_source = priv->mask_source[i];
977 score = mask_source->can_drive (mask_source, render);
978 if (score > best_score)
979 {
980 best_score = score;
981 best_driver = i;
982 }
983 }
984
985 /* Allocate alpha buffer if needed. */
986 if (priv->n_mask_source > 1 ||
987 (priv->n_mask_source == 1 && best_driver < 0))
988 {
989 render->alpha_buf = art_new (art_u8, (width * render->depth) >> 3);
990 }
991
992 /* Negotiate image rendering and compositing. */
993 image_source = priv->image_source;
994 image_source->negotiate (image_source, render, &image_flags, &buf_depth,
995 &buf_alpha);
996
997 /* Build callback list. */
998 n_callbacks_max = priv->n_mask_source + 3;
999 priv->callbacks = art_new (ArtRenderCallback *, n_callbacks_max);
1000 n_callbacks = 0;
1001 for (i = 0; i < priv->n_mask_source; i++)
1002 if (i != best_driver)
1003 {
1004 ArtMaskSource *mask_source = priv->mask_source[i];
1005
1006 mask_source->prepare (mask_source, render, first);
1007 first = ART_FALSE;
1008 priv->callbacks[n_callbacks++] = &mask_source->super;
1009 }
1010
1011 if (render->clear && !(image_flags & ART_IMAGE_SOURCE_CAN_CLEAR))
1012 priv->callbacks[n_callbacks++] =
1013 art_render_choose_clear_callback (render);
1014
1015 priv->callbacks[n_callbacks++] = &image_source->super;
1016
1017 /* Allocate image buffer and add compositing callback if needed. */
1018 if (!(image_flags & ART_IMAGE_SOURCE_CAN_COMPOSITE))
1019 {
1020 int bytespp = ((render->n_chan + (buf_alpha != ART_ALPHA_NONE)) *
1021 buf_depth) >> 3;
1022 render->buf_depth = buf_depth;
1023 render->buf_alpha = buf_alpha;
1024 render->image_buf = art_new (art_u8, width * bytespp);
1025 priv->callbacks[n_callbacks++] =
1026 art_render_choose_compositing_callback (render);
1027 }
1028
1029 priv->n_callbacks = n_callbacks;
1030
1031 if (render->need_span)
1032 render->span_x = art_new (int, width + 1);
1033
1034 /* Invoke the driver */
1035 if (best_driver >= 0)
1036 {
1037 ArtMaskSource *driver;
1038
1039 driver = priv->mask_source[best_driver];
1040 driver->invoke_driver (driver, render);
1041 }
1042 else
1043 {
1044 art_u8 *dest_ptr = render->pixels;
1045 int y;
1046
1047 /* Dummy driver */
1048 render->n_run = 2;
1049 render->run[0].x = render->x0;
1050 render->run[0].alpha = 0x8000 + 0xff * render->opacity;
1051 render->run[1].x = render->x1;
1052 render->run[1].alpha = 0x8000;
1053 if (render->need_span)
1054 {
1055 render->n_span = 2;
1056 render->span_x[0] = render->x0;
1057 render->span_x[1] = render->x1;
1058 }
1059 for (y = render->y0; y < render->y1; y++)
1060 {
1061 art_render_invoke_callbacks (render, dest_ptr, y);
1062 dest_ptr += render->rowstride;
1063 }
1064 }
1065
1066 if (priv->mask_source != NULL)
1067 art_free (priv->mask_source);
1068
1069 /* clean up callbacks */
1070 for (i = 0; i < priv->n_callbacks; i++)
1071 {
1072 ArtRenderCallback *callback;
1073
1074 callback = priv->callbacks[i];
1075 callback->done (callback, render);
1076 }
1077
1078 /* Tear down object */
1079 if (render->alpha_buf != NULL)
1080 art_free (render->alpha_buf);
1081 if (render->image_buf != NULL)
1082 art_free (render->image_buf);
1083 art_free (render->run);
1084 if (render->span_x != NULL)
1085 art_free (render->span_x);
1086 art_free (priv->callbacks);
1087 art_free (render);
1088 }
1089
1090 /**
1091 * art_render_mask_solid: Add a solid translucent mask.
1092 * @render: The render object.
1093 * @opacity: Opacity in [0..0x10000] form.
1094 *
1095 * Adds a translucent mask to the rendering object.
1096 **/
1097 void
art_render_mask_solid(ArtRender * render,int opacity)1098 art_render_mask_solid (ArtRender *render, int opacity)
1099 {
1100 art_u32 old_opacity = render->opacity;
1101 art_u32 new_opacity_tmp;
1102
1103 if (opacity == 0x10000)
1104 /* avoid potential overflow */
1105 return;
1106 new_opacity_tmp = old_opacity * (art_u32)opacity + 0x8000;
1107 render->opacity = new_opacity_tmp >> 16;
1108 }
1109
1110 /**
1111 * art_render_add_mask_source: Add a mask source to the render object.
1112 * @render: Render object.
1113 * @mask_source: Mask source to add.
1114 *
1115 * This routine adds a mask source to the render object. In general,
1116 * client api's for adding mask sources should just take a render object,
1117 * then the mask source creation function should call this function.
1118 * Clients should never have to call this function directly, unless of
1119 * course they're creating custom mask sources.
1120 **/
1121 void
art_render_add_mask_source(ArtRender * render,ArtMaskSource * mask_source)1122 art_render_add_mask_source (ArtRender *render, ArtMaskSource *mask_source)
1123 {
1124 ArtRenderPriv *priv = (ArtRenderPriv *)render;
1125 int n_mask_source = priv->n_mask_source++;
1126
1127 if (n_mask_source == 0)
1128 priv->mask_source = art_new (ArtMaskSource *, 1);
1129 /* This predicate is true iff n_mask_source is a power of two */
1130 else if (!(n_mask_source & (n_mask_source - 1)))
1131 priv->mask_source = art_renew (priv->mask_source, ArtMaskSource *,
1132 n_mask_source << 1);
1133
1134 priv->mask_source[n_mask_source] = mask_source;
1135 }
1136
1137 /**
1138 * art_render_add_image_source: Add a mask source to the render object.
1139 * @render: Render object.
1140 * @image_source: Image source to add.
1141 *
1142 * This routine adds an image source to the render object. In general,
1143 * client api's for adding image sources should just take a render
1144 * object, then the mask source creation function should call this
1145 * function. Clients should never have to call this function
1146 * directly, unless of course they're creating custom image sources.
1147 **/
1148 void
art_render_add_image_source(ArtRender * render,ArtImageSource * image_source)1149 art_render_add_image_source (ArtRender *render, ArtImageSource *image_source)
1150 {
1151 ArtRenderPriv *priv = (ArtRenderPriv *)render;
1152
1153 if (priv->image_source != NULL)
1154 {
1155 art_warn ("art_render_add_image_source: image source already present.\n");
1156 return;
1157 }
1158 priv->image_source = image_source;
1159 }
1160
1161 /* Solid image source object and methods. Perhaps this should go into a
1162 separate file. */
1163
1164 typedef struct _ArtImageSourceSolid ArtImageSourceSolid;
1165
1166 struct _ArtImageSourceSolid {
1167 ArtImageSource super;
1168 ArtPixMaxDepth color[ART_MAX_CHAN];
1169 art_u32 *rgbtab;
1170 art_boolean init;
1171 };
1172
1173 static void
art_render_image_solid_done(ArtRenderCallback * self,ArtRender * render)1174 art_render_image_solid_done (ArtRenderCallback *self, ArtRender *render)
1175 {
1176 ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
1177
1178 if (z->rgbtab != NULL)
1179 art_free (z->rgbtab);
1180 art_free (self);
1181 }
1182
1183 static void
art_render_image_solid_rgb8_opaq_init(ArtImageSourceSolid * self,ArtRender * render)1184 art_render_image_solid_rgb8_opaq_init (ArtImageSourceSolid *self, ArtRender *render)
1185 {
1186 ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
1187 ArtPixMaxDepth color_max;
1188 int r_fg, g_fg, b_fg;
1189 int r_bg, g_bg, b_bg;
1190 int r, g, b;
1191 int dr, dg, db;
1192 int i;
1193 int tmp;
1194 art_u32 *rgbtab;
1195
1196 rgbtab = art_new (art_u32, 256);
1197 z->rgbtab = rgbtab;
1198
1199 color_max = self->color[0];
1200 r_fg = ART_PIX_8_FROM_MAX (color_max);
1201 color_max = self->color[1];
1202 g_fg = ART_PIX_8_FROM_MAX (color_max);
1203 color_max = self->color[2];
1204 b_fg = ART_PIX_8_FROM_MAX (color_max);
1205
1206 color_max = render->clear_color[0];
1207 r_bg = ART_PIX_8_FROM_MAX (color_max);
1208 color_max = render->clear_color[1];
1209 g_bg = ART_PIX_8_FROM_MAX (color_max);
1210 color_max = render->clear_color[2];
1211 b_bg = ART_PIX_8_FROM_MAX (color_max);
1212
1213 r = (r_bg << 16) + 0x8000;
1214 g = (g_bg << 16) + 0x8000;
1215 b = (b_bg << 16) + 0x8000;
1216 tmp = ((r_fg - r_bg) << 16) + 0x80;
1217 dr = (tmp + (tmp >> 8)) >> 8;
1218 tmp = ((g_fg - g_bg) << 16) + 0x80;
1219 dg = (tmp + (tmp >> 8)) >> 8;
1220 tmp = ((b_fg - b_bg) << 16) + 0x80;
1221 db = (tmp + (tmp >> 8)) >> 8;
1222
1223 for (i = 0; i < 256; i++)
1224 {
1225 rgbtab[i] = (r & 0xff0000) | ((g & 0xff0000) >> 8) | (b >> 16);
1226 r += dr;
1227 g += dg;
1228 b += db;
1229 }
1230 }
1231
1232 static void
art_render_image_solid_rgb8_opaq(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)1233 art_render_image_solid_rgb8_opaq (ArtRenderCallback *self, ArtRender *render,
1234 art_u8 *dest, int y)
1235 {
1236 ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
1237 ArtRenderMaskRun *run = render->run;
1238 int n_run = render->n_run;
1239 art_u32 *rgbtab = z->rgbtab;
1240 art_u32 rgb;
1241 int x0 = render->x0;
1242 int x1 = render->x1;
1243 int run_x0, run_x1;
1244 int i;
1245 int ix;
1246
1247 if (n_run > 0)
1248 {
1249 run_x1 = run[0].x;
1250 if (run_x1 > x0)
1251 {
1252 rgb = rgbtab[0];
1253 art_rgb_fill_run (dest,
1254 rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
1255 run_x1 - x0);
1256 }
1257 for (i = 0; i < n_run - 1; i++)
1258 {
1259 run_x0 = run_x1;
1260 run_x1 = run[i + 1].x;
1261 rgb = rgbtab[(run[i].alpha >> 16) & 0xff];
1262 ix = (run_x0 - x0) * 3;
1263 #define OPTIMIZE_LEN_1
1264 #ifdef OPTIMIZE_LEN_1
1265 if (run_x1 - run_x0 == 1)
1266 {
1267 dest[ix] = rgb >> 16;
1268 dest[ix + 1] = (rgb >> 8) & 0xff;
1269 dest[ix + 2] = rgb & 0xff;
1270 }
1271 else
1272 {
1273 art_rgb_fill_run (dest + ix,
1274 rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
1275 run_x1 - run_x0);
1276 }
1277 #else
1278 art_rgb_fill_run (dest + ix,
1279 rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
1280 run_x1 - run_x0);
1281 #endif
1282 }
1283 }
1284 else
1285 {
1286 run_x1 = x0;
1287 }
1288 if (run_x1 < x1)
1289 {
1290 rgb = rgbtab[0];
1291 art_rgb_fill_run (dest + (run_x1 - x0) * 3,
1292 rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff,
1293 x1 - run_x1);
1294 }
1295 }
1296
1297 static void
art_render_image_solid_rgb8(ArtRenderCallback * self,ArtRender * render,art_u8 * dest,int y)1298 art_render_image_solid_rgb8 (ArtRenderCallback *self, ArtRender *render,
1299 art_u8 *dest, int y)
1300 {
1301 ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
1302 int width = render->x1 - render->x0;
1303 art_u8 r, g, b;
1304 ArtPixMaxDepth color_max;
1305
1306 /* todo: replace this simple test with real sparseness */
1307 if (z->init)
1308 return;
1309 z->init = ART_TRUE;
1310
1311 color_max = z->color[0];
1312 r = ART_PIX_8_FROM_MAX (color_max);
1313 color_max = z->color[1];
1314 g = ART_PIX_8_FROM_MAX (color_max);
1315 color_max = z->color[2];
1316 b = ART_PIX_8_FROM_MAX (color_max);
1317
1318 art_rgb_fill_run (render->image_buf, r, g, b, width);
1319 }
1320
1321 static void
art_render_image_solid_negotiate(ArtImageSource * self,ArtRender * render,ArtImageSourceFlags * p_flags,int * p_buf_depth,ArtAlphaType * p_alpha)1322 art_render_image_solid_negotiate (ArtImageSource *self, ArtRender *render,
1323 ArtImageSourceFlags *p_flags,
1324 int *p_buf_depth, ArtAlphaType *p_alpha)
1325 {
1326 ArtImageSourceSolid *z = (ArtImageSourceSolid *)self;
1327 ArtImageSourceFlags flags = 0;
1328 static void (*render_cbk) (ArtRenderCallback *self, ArtRender *render,
1329 art_u8 *dest, int y);
1330
1331 render_cbk = NULL;
1332
1333 if (render->depth == 8 && render->n_chan == 3 &&
1334 render->alpha_type == ART_ALPHA_NONE)
1335 {
1336 if (render->clear)
1337 {
1338 render_cbk = art_render_image_solid_rgb8_opaq;
1339 flags |= ART_IMAGE_SOURCE_CAN_CLEAR | ART_IMAGE_SOURCE_CAN_COMPOSITE;
1340 art_render_image_solid_rgb8_opaq_init (z, render);
1341 }
1342 }
1343 if (render_cbk == NULL)
1344 {
1345 if (render->depth == 8)
1346 {
1347 render_cbk = art_render_image_solid_rgb8;
1348 *p_buf_depth = 8;
1349 *p_alpha = ART_ALPHA_NONE; /* todo */
1350 }
1351 }
1352 /* todo: general case */
1353 self->super.render = render_cbk;
1354 *p_flags = flags;
1355 }
1356
1357 /**
1358 * art_render_image_solid: Add a solid color image source.
1359 * @render: The render object.
1360 * @color: Color.
1361 *
1362 * Adds an image source with the solid color given by @color. The
1363 * color need not be retained in memory after this call.
1364 **/
1365 void
art_render_image_solid(ArtRender * render,ArtPixMaxDepth * color)1366 art_render_image_solid (ArtRender *render, ArtPixMaxDepth *color)
1367 {
1368 ArtImageSourceSolid *image_source;
1369 int i;
1370
1371 image_source = art_new (ArtImageSourceSolid, 1);
1372 image_source->super.super.render = NULL;
1373 image_source->super.super.done = art_render_image_solid_done;
1374 image_source->super.negotiate = art_render_image_solid_negotiate;
1375
1376 for (i = 0; i < render->n_chan; i++)
1377 image_source->color[i] = color[i];
1378
1379 image_source->rgbtab = NULL;
1380 image_source->init = ART_FALSE;
1381
1382 art_render_add_image_source (render, &image_source->super);
1383 }
1384