Add patch that contain Mali fixes.
[deb_xorg-server.git] / mi / miline.h
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a09e091a
JB
1
2/*
3
4Copyright 1994, 1998 The Open Group
5
6Permission to use, copy, modify, distribute, and sell this software and its
7documentation for any purpose is hereby granted without fee, provided that
8the above copyright notice appear in all copies and that both that
9copyright notice and this permission notice appear in supporting
10documentation.
11
12The above copyright notice and this permission notice shall be included in
13all copies or substantial portions of the Software.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
19AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22Except as contained in this notice, the name of The Open Group shall not be
23used in advertising or otherwise to promote the sale, use or other dealings
24in this Software without prior written authorization from The Open Group.
25
26*/
27
28#ifndef MILINE_H
29
30#include "screenint.h"
31#include "privates.h"
32
33/*
34 * Public definitions used for configuring basic pixelization aspects
35 * of the sample implementation line-drawing routines provided in
36 * {mfb,mi,cfb*} at run-time.
37 */
38
39#define XDECREASING 4
40#define YDECREASING 2
41#define YMAJOR 1
42
43#define OCTANT1 (1 << (YDECREASING))
44#define OCTANT2 (1 << (YDECREASING|YMAJOR))
45#define OCTANT3 (1 << (XDECREASING|YDECREASING|YMAJOR))
46#define OCTANT4 (1 << (XDECREASING|YDECREASING))
47#define OCTANT5 (1 << (XDECREASING))
48#define OCTANT6 (1 << (XDECREASING|YMAJOR))
49#define OCTANT7 (1 << (YMAJOR))
50#define OCTANT8 (1 << (0))
51
52#define XMAJOROCTANTS (OCTANT1 | OCTANT4 | OCTANT5 | OCTANT8)
53
54#define DEFAULTZEROLINEBIAS (OCTANT2 | OCTANT3 | OCTANT4 | OCTANT5)
55
56/*
57 * Devices can configure the rendering of routines in mi, mfb, and cfb*
58 * by specifying a thin line bias to be applied to a particular screen
59 * using the following function. The bias parameter is an OR'ing of
60 * the appropriate OCTANT constants defined above to indicate which
61 * octants to bias a line to prefer an axial step when the Bresenham
62 * error term is exactly zero. The octants are mapped as follows:
63 *
64 * \ | /
65 * \ 3 | 2 /
66 * \ | /
67 * 4 \ | / 1
68 * \|/
69 * -----------
70 * /|\
71 * 5 / | \ 8
72 * / | \
73 * / 6 | 7 \
74 * / | \
75 *
76 * For more information, see "Ambiguities in Incremental Line Rastering,"
77 * Jack E. Bresenham, IEEE CG&A, May 1987.
78 */
79
80extern _X_EXPORT void miSetZeroLineBias(ScreenPtr /* pScreen */ ,
81 unsigned int /* bias */
82 );
83
84/*
85 * Private definitions needed for drawing thin (zero width) lines
86 * Used by the mi, mfb, and all cfb* components.
87 */
88
89#define X_AXIS 0
90#define Y_AXIS 1
91
92#define OUT_LEFT 0x08
93#define OUT_RIGHT 0x04
94#define OUT_ABOVE 0x02
95#define OUT_BELOW 0x01
96
97#define OUTCODES(_result, _x, _y, _pbox) \
98 if ( (_x) < (_pbox)->x1) (_result) |= OUT_LEFT; \
99 else if ( (_x) >= (_pbox)->x2) (_result) |= OUT_RIGHT; \
100 if ( (_y) < (_pbox)->y1) (_result) |= OUT_ABOVE; \
101 else if ( (_y) >= (_pbox)->y2) (_result) |= OUT_BELOW;
102
103#define MIOUTCODES(outcode, x, y, xmin, ymin, xmax, ymax) \
104{\
105 if (x < xmin) outcode |= OUT_LEFT;\
106 if (x > xmax) outcode |= OUT_RIGHT;\
107 if (y < ymin) outcode |= OUT_ABOVE;\
108 if (y > ymax) outcode |= OUT_BELOW;\
109}
110
111#define SWAPINT(i, j) \
112{ int _t = i; i = j; j = _t; }
113
114#define SWAPPT(i, j) \
115{ DDXPointRec _t; _t = i; i = j; j = _t; }
116
117#define SWAPINT_PAIR(x1, y1, x2, y2)\
118{ int t = x1; x1 = x2; x2 = t;\
119 t = y1; y1 = y2; y2 = t;\
120}
121
122#define miGetZeroLineBias(_pScreen) ((unsigned long) (unsigned long*)\
123 dixLookupPrivate(&(_pScreen)->devPrivates, miZeroLineScreenKey))
124
125#define CalcLineDeltas(_x1,_y1,_x2,_y2,_adx,_ady,_sx,_sy,_SX,_SY,_octant) \
126 (_octant) = 0; \
127 (_sx) = (_SX); \
128 if (((_adx) = (_x2) - (_x1)) < 0) { \
129 (_adx) = -(_adx); \
130 (_sx = -(_sx)); \
131 (_octant) |= XDECREASING; \
132 } \
133 (_sy) = (_SY); \
134 if (((_ady) = (_y2) - (_y1)) < 0) { \
135 (_ady) = -(_ady); \
136 (_sy = -(_sy)); \
137 (_octant) |= YDECREASING; \
138 }
139
140#define SetYMajorOctant(_octant) ((_octant) |= YMAJOR)
141
142#define FIXUP_ERROR(_e, _octant, _bias) \
143 (_e) -= (((_bias) >> (_octant)) & 1)
144
145#define IsXMajorOctant(_octant) (!((_octant) & YMAJOR))
146#define IsYMajorOctant(_octant) ((_octant) & YMAJOR)
147#define IsXDecreasingOctant(_octant) ((_octant) & XDECREASING)
148#define IsYDecreasingOctant(_octant) ((_octant) & YDECREASING)
149
150extern _X_EXPORT DevPrivateKeyRec miZeroLineScreenKeyRec;
151
152#define miZeroLineScreenKey (&miZeroLineScreenKeyRec)
153
154extern _X_EXPORT int miZeroClipLine(int /*xmin */ ,
155 int /*ymin */ ,
156 int /*xmax */ ,
157 int /*ymax */ ,
158 int * /*new_x1 */ ,
159 int * /*new_y1 */ ,
160 int * /*new_x2 */ ,
161 int * /*new_y2 */ ,
162 unsigned int /*adx */ ,
163 unsigned int /*ady */ ,
164 int * /*pt1_clipped */ ,
165 int * /*pt2_clipped */ ,
166 int /*octant */ ,
167 unsigned int /*bias */ ,
168 int /*oc1 */ ,
169 int /*oc2 */
170 );
171
172#endif /* MILINE_H */