1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/* -*- mode: c; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3; coding: utf-8-unix -*- */
/*
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice including the dates of first publication and
* either this permission notice or a reference to
* http://oss.sgi.com/projects/FreeB/
* shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of Silicon Graphics, Inc.
* shall not be used in advertising or otherwise to promote the sale, use or
* other dealings in this Software without prior written authorization from
* Silicon Graphics, Inc.
*/
#include <GL/gl.h>
#include "indirect_size.h"
#include "glxclient.h"
/*
** Return the number of elements per group of a specified format
*/
GLint
__glElementsPerGroup(GLenum format, GLenum type)
{
/*
** To make row length computation valid for image extraction,
** packed pixel types assume elements per group equals one.
*/
switch (type) {
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_SHORT_8_8_APPLE:
case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
case GL_UNSIGNED_SHORT_15_1_MESA:
case GL_UNSIGNED_SHORT_1_15_REV_MESA:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
case GL_UNSIGNED_INT_24_8_NV:
case GL_UNSIGNED_INT_24_8_MESA:
case GL_UNSIGNED_INT_8_24_REV_MESA:
return 1;
default:
break;
}
switch (format) {
case GL_RGB:
case GL_BGR:
return 3;
case GL_422_EXT:
case GL_422_REV_EXT:
case GL_422_AVERAGE_EXT:
case GL_422_REV_AVERAGE_EXT:
case GL_YCBCR_422_APPLE:
case GL_LUMINANCE_ALPHA:
return 2;
case GL_RGBA:
case GL_BGRA:
case GL_ABGR_EXT:
return 4;
case GL_COLOR_INDEX:
case GL_STENCIL_INDEX:
case GL_DEPTH_COMPONENT:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
case GL_INTENSITY:
return 1;
default:
return 0;
}
}
/*
** Return the number of bytes per element, based on the element type (other
** than GL_BITMAP).
*/
GLint
__glBytesPerElement(GLenum type)
{
switch (type) {
case GL_UNSIGNED_SHORT:
case GL_SHORT:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_SHORT_8_8_APPLE:
case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
case GL_UNSIGNED_SHORT_15_1_MESA:
case GL_UNSIGNED_SHORT_1_15_REV_MESA:
return 2;
case GL_UNSIGNED_BYTE:
case GL_BYTE:
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
return 1;
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
case GL_UNSIGNED_INT_24_8_NV:
case GL_UNSIGNED_INT_24_8_MESA:
case GL_UNSIGNED_INT_8_24_REV_MESA:
return 4;
default:
return 0;
}
}
/*
** Compute memory required for internal packed array of data of given type
** and format.
*/
GLint
__glImageSize(GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type, GLenum target)
{
int bytes_per_row;
int components;
switch (target) {
case GL_PROXY_TEXTURE_1D:
case GL_PROXY_TEXTURE_2D:
case GL_PROXY_TEXTURE_3D:
case GL_PROXY_TEXTURE_4D_SGIS:
case GL_PROXY_TEXTURE_CUBE_MAP:
case GL_PROXY_TEXTURE_RECTANGLE_ARB:
case GL_PROXY_HISTOGRAM:
case GL_PROXY_COLOR_TABLE:
case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP:
return 0;
}
if (width < 0 || height < 0 || depth < 0) {
return 0;
}
/*
** Zero is returned if either format or type are invalid.
*/
components = __glElementsPerGroup(format, type);
if (type == GL_BITMAP) {
if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
bytes_per_row = (width + 7) >> 3;
}
else {
return 0;
}
}
else {
bytes_per_row = __glBytesPerElement(type) * width;
}
return bytes_per_row * height * depth * components;
}
|
