d46d3d41d1f6f2651d2b13917025017d5acb63be
[mesa.git] / src / glx / x11 / compsize.c
1 /*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31 #include <GL/gl.h>
32 #include "indirect_size.h"
33 #include "glxclient.h"
34
35 /*
36 ** Return the number of elements per group of a specified format
37 */
38 GLint __glElementsPerGroup(GLenum format, GLenum type)
39 {
40 /*
41 ** To make row length computation valid for image extraction,
42 ** packed pixel types assume elements per group equals one.
43 */
44 switch(type) {
45 case GL_UNSIGNED_BYTE_3_3_2:
46 case GL_UNSIGNED_BYTE_2_3_3_REV:
47 case GL_UNSIGNED_SHORT_5_6_5:
48 case GL_UNSIGNED_SHORT_5_6_5_REV:
49 case GL_UNSIGNED_SHORT_4_4_4_4:
50 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
51 case GL_UNSIGNED_SHORT_5_5_5_1:
52 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
53 case GL_UNSIGNED_SHORT_8_8_APPLE:
54 case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
55 case GL_UNSIGNED_SHORT_15_1_MESA:
56 case GL_UNSIGNED_SHORT_1_15_REV_MESA:
57 case GL_UNSIGNED_INT_8_8_8_8:
58 case GL_UNSIGNED_INT_8_8_8_8_REV:
59 case GL_UNSIGNED_INT_10_10_10_2:
60 case GL_UNSIGNED_INT_2_10_10_10_REV:
61 case GL_UNSIGNED_INT_24_8_NV:
62 case GL_UNSIGNED_INT_24_8_MESA:
63 case GL_UNSIGNED_INT_8_24_REV_MESA:
64 return 1;
65 default:
66 break;
67 }
68
69 switch(format) {
70 case GL_RGB:
71 case GL_BGR:
72 return 3;
73 case GL_422_EXT:
74 case GL_422_REV_EXT:
75 case GL_422_AVERAGE_EXT:
76 case GL_422_REV_AVERAGE_EXT:
77 case GL_YCBCR_422_APPLE:
78 case GL_LUMINANCE_ALPHA:
79 return 2;
80 case GL_RGBA:
81 case GL_BGRA:
82 case GL_ABGR_EXT:
83 return 4;
84 case GL_COLOR_INDEX:
85 case GL_STENCIL_INDEX:
86 case GL_DEPTH_COMPONENT:
87 case GL_RED:
88 case GL_GREEN:
89 case GL_BLUE:
90 case GL_ALPHA:
91 case GL_LUMINANCE:
92 case GL_INTENSITY:
93 return 1;
94 default:
95 return 0;
96 }
97 }
98
99 /*
100 ** Return the number of bytes per element, based on the element type (other
101 ** than GL_BITMAP).
102 */
103 GLint __glBytesPerElement(GLenum type)
104 {
105 switch(type) {
106 case GL_UNSIGNED_SHORT:
107 case GL_SHORT:
108 case GL_UNSIGNED_SHORT_5_6_5:
109 case GL_UNSIGNED_SHORT_5_6_5_REV:
110 case GL_UNSIGNED_SHORT_4_4_4_4:
111 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
112 case GL_UNSIGNED_SHORT_5_5_5_1:
113 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
114 case GL_UNSIGNED_SHORT_8_8_APPLE:
115 case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
116 case GL_UNSIGNED_SHORT_15_1_MESA:
117 case GL_UNSIGNED_SHORT_1_15_REV_MESA:
118 return 2;
119 case GL_UNSIGNED_BYTE:
120 case GL_BYTE:
121 case GL_UNSIGNED_BYTE_3_3_2:
122 case GL_UNSIGNED_BYTE_2_3_3_REV:
123 return 1;
124 case GL_INT:
125 case GL_UNSIGNED_INT:
126 case GL_FLOAT:
127 case GL_UNSIGNED_INT_8_8_8_8:
128 case GL_UNSIGNED_INT_8_8_8_8_REV:
129 case GL_UNSIGNED_INT_10_10_10_2:
130 case GL_UNSIGNED_INT_2_10_10_10_REV:
131 case GL_UNSIGNED_INT_24_8_NV:
132 case GL_UNSIGNED_INT_24_8_MESA:
133 case GL_UNSIGNED_INT_8_24_REV_MESA:
134 return 4;
135 default:
136 return 0;
137 }
138 }
139
140 /*
141 ** Compute memory required for internal packed array of data of given type
142 ** and format.
143 */
144 GLint __glImageSize(GLsizei width, GLsizei height, GLsizei depth,
145 GLenum format, GLenum type, GLenum target)
146 {
147 int bytes_per_row;
148 int components;
149
150 switch( target ) {
151 case GL_PROXY_TEXTURE_1D:
152 case GL_PROXY_TEXTURE_2D:
153 case GL_PROXY_TEXTURE_3D:
154 case GL_PROXY_TEXTURE_4D_SGIS:
155 case GL_PROXY_TEXTURE_CUBE_MAP:
156 case GL_PROXY_TEXTURE_RECTANGLE_ARB:
157 case GL_PROXY_HISTOGRAM:
158 case GL_PROXY_COLOR_TABLE:
159 case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
160 case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
161 case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
162 case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP:
163 return 0;
164 }
165
166 if (width < 0 || height < 0 || depth < 0) {
167 return 0;
168 }
169
170 /*
171 ** Zero is returned if either format or type are invalid.
172 */
173 components = __glElementsPerGroup(format,type);
174 if (type == GL_BITMAP) {
175 if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
176 bytes_per_row = (width + 7) >> 3;
177 } else {
178 return 0;
179 }
180 } else {
181 bytes_per_row = __glBytesPerElement(type) * width;
182 }
183
184 return bytes_per_row * height * depth * components;
185 }