fbclip.h revision 428d7b3d 
1/*
2 * Copyright © 2012 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 *    Chris Wilson <chris@chris-wilson.co.uk>
25 *
26 */
27
28#ifndef FBCLIP_H
29#define FBCLIP_H
30
31extern const BoxRec *
32fbClipBoxes(const RegionRec *region, const BoxRec *box, const BoxRec **end);
33
34inline static bool
35box_intersect(BoxPtr a, const BoxRec *b)
36{
37	if (a->x1 < b->x1)
38		a->x1 = b->x1;
39	if (a->x2 > b->x2)
40		a->x2 = b->x2;
41	if (a->x1 >= a->x2)
42		return false;
43
44	if (a->y1 < b->y1)
45		a->y1 = b->y1;
46	if (a->y2 > b->y2)
47		a->y2 = b->y2;
48	if (a->y1 >= a->y2)
49		return false;
50
51	return true;
52}
53
54#define run_box(b, c) \
55	DBG(("%s: box=(%d, %d), (%d, %d), clip=(%d, %d), (%d, %d)\n", \
56	     __FUNCTION__, (b)->x1, (b)->y1, (b)->x2, (b)->y2, (c)->x1, (c)->y1, (c)->x2, (c)->y2)); \
57	if ((b)->y2 <= (c)->y1) break; \
58	if ((b)->x1 >= (c)->x2) continue; \
59	if ((b)->x2 <= (c)->x1) { if ((b)->y2 <= (c)->y2) break; continue; }
60
61static inline void
62fbDrawableRun(DrawablePtr d, GCPtr gc, const BoxRec *box,
63	      void (*func)(DrawablePtr, GCPtr, const BoxRec *b, void *data),
64	      void *data)
65{
66	const BoxRec *c, *end;
67	for (c = fbClipBoxes(gc->pCompositeClip, box, &end); c != end; c++) {
68		BoxRec b;
69
70		run_box(box, c);
71
72		b = *box;
73		if (box_intersect(&b, c))
74			func(d, gc, &b, data);
75	}
76}
77
78static inline void
79fbDrawableRunUnclipped(DrawablePtr d, GCPtr gc, const BoxRec *box,
80		       void (*func)(DrawablePtr, GCPtr, const BoxRec *b, void *data),
81		       void *data)
82{
83	const BoxRec *c, *end;
84	for (c = fbClipBoxes(gc->pCompositeClip, box, &end); c != end; c++) {
85		run_box(box, c);
86		func(d, gc, c, data);
87	}
88}
89
90#endif /* FBCLIP_H */
91