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source: vbox/trunk/src/VBox/Additions/x11/x11include/xorg-server-1.3.0.0/renderedge.h@ 61386

最後變更 在這個檔案從61386是 25078,由 vboxsync 提交於 15 年 前

Additions/x11/x11include: exported and set eol-style on new headers

  • 屬性 svn:eol-style 設為 native
檔案大小: 3.3 KB
 
1/*
2 * $Id$
3 *
4 * Copyright © 2004 Keith Packard
5 *
6 * Permission to use, copy, modify, distribute, and sell this software and its
7 * documentation for any purpose is hereby granted without fee, provided that
8 * the above copyright notice appear in all copies and that both that
9 * copyright notice and this permission notice appear in supporting
10 * documentation, and that the name of Keith Packard not be used in
11 * advertising or publicity pertaining to distribution of the software without
12 * specific, written prior permission. Keith Packard makes no
13 * representations about the suitability of this software for any purpose. It
14 * is provided "as is" without express or implied warranty.
15 *
16 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
17 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
18 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
19 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
20 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
21 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
22 * PERFORMANCE OF THIS SOFTWARE.
23 */
24
25#ifndef _RENDEREDGE_H_
26#define _RENDEREDGE_H_
27
28#include "picturestr.h"
29
30#define MAX_ALPHA(n) ((1 << (n)) - 1)
31#define N_Y_FRAC(n) ((n) == 1 ? 1 : (1 << ((n)/2)) - 1)
32#define N_X_FRAC(n) ((1 << ((n)/2)) + 1)
33
34#define STEP_Y_SMALL(n) (xFixed1 / N_Y_FRAC(n))
35#define STEP_Y_BIG(n) (xFixed1 - (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))
36
37#define Y_FRAC_FIRST(n) (STEP_Y_SMALL(n) / 2)
38#define Y_FRAC_LAST(n) (Y_FRAC_FIRST(n) + (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))
39
40#define STEP_X_SMALL(n) (xFixed1 / N_X_FRAC(n))
41#define STEP_X_BIG(n) (xFixed1 - (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))
42
43#define X_FRAC_FIRST(n) (STEP_X_SMALL(n) / 2)
44#define X_FRAC_LAST(n) (X_FRAC_FIRST(n) + (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))
45
46#define RenderSamplesX(x,n) ((n) == 1 ? 0 : (xFixedFrac (x) + X_FRAC_FIRST(n)) / STEP_X_SMALL(n))
47
48/*
49 * An edge structure. This represents a single polygon edge
50 * and can be quickly stepped across small or large gaps in the
51 * sample grid
52 */
53
54typedef struct {
55 xFixed x;
56 xFixed e;
57 xFixed stepx;
58 xFixed signdx;
59 xFixed dy;
60 xFixed dx;
61
62 xFixed stepx_small;
63 xFixed stepx_big;
64 xFixed dx_small;
65 xFixed dx_big;
66} RenderEdge;
67
68/*
69 * Step across a small sample grid gap
70 */
71#define RenderEdgeStepSmall(edge) { \
72 edge->x += edge->stepx_small; \
73 edge->e += edge->dx_small; \
74 if (edge->e > 0) \
75 { \
76 edge->e -= edge->dy; \
77 edge->x += edge->signdx; \
78 } \
79}
80
81/*
82 * Step across a large sample grid gap
83 */
84#define RenderEdgeStepBig(edge) { \
85 edge->x += edge->stepx_big; \
86 edge->e += edge->dx_big; \
87 if (edge->e > 0) \
88 { \
89 edge->e -= edge->dy; \
90 edge->x += edge->signdx; \
91 } \
92}
93
94xFixed
95RenderSampleCeilY (xFixed y, int bpp);
96
97xFixed
98RenderSampleFloorY (xFixed y, int bpp);
99
100void
101RenderEdgeStep (RenderEdge *e, int n);
102
103void
104RenderEdgeInit (RenderEdge *e,
105 int bpp,
106 xFixed y_start,
107 xFixed x_top,
108 xFixed y_top,
109 xFixed x_bot,
110 xFixed y_bot);
111
112void
113RenderLineFixedEdgeInit (RenderEdge *e,
114 int bpp,
115 xFixed y,
116 xLineFixed *line,
117 int x_off,
118 int y_off);
119
120#endif /* _RENDEREDGE_H_ */
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