src/glx/x11/compsize.c

   1 /* $XFree86: xc/lib/GL/glx/compsize.c,v 1.6 2004/01/28 18:11:38 alanh Exp $ */
   2 /*
   3 ** License Applicability. Except to the extent portions of this file are
   4 ** made subject to an alternative license as permitted in the SGI Free
   5 ** Software License B, Version 1.1 (the "License"), the contents of this
   6 ** file are subject only to the provisions of the License. You may not use
   7 ** this file except in compliance with the License. You may obtain a copy
   8 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   9 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
  10 **
  11 ** http://oss.sgi.com/projects/FreeB
  12 **
  13 ** Note that, as provided in the License, the Software is distributed on an
  14 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  15 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  16 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  17 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  18 **
  19 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  20 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  21 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  22 ** Copyright in any portions created by third parties is as indicated
  23 ** elsewhere herein. All Rights Reserved.
  24 **
  25 ** Additional Notice Provisions: The application programming interfaces
  26 ** established by SGI in conjunction with the Original Code are The
  27 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  28 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  29 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  30 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  31 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  32 ** published by SGI, but has not been independently verified as being
  33 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  34 **
  35 */
  36
  37 #include <GL/gl.h>
  38 #include "indirect_size.h"
  39 #include "glxclient.h"
  40
  41 /*
  42 ** Return the number of elements per group of a specified format
  43 */
  44 GLint __glElementsPerGroup(GLenum format, GLenum type)
  45 {
  46     /*
  47     ** To make row length computation valid for image extraction,
  48     ** packed pixel types assume elements per group equals one.
  49     */
  50     switch(type) {
  51     case GL_UNSIGNED_BYTE_3_3_2:
  52     case GL_UNSIGNED_BYTE_2_3_3_REV:
  53     case GL_UNSIGNED_SHORT_5_6_5:
  54     case GL_UNSIGNED_SHORT_5_6_5_REV:
  55     case GL_UNSIGNED_SHORT_4_4_4_4:
  56     case GL_UNSIGNED_SHORT_4_4_4_4_REV:
  57     case GL_UNSIGNED_SHORT_5_5_5_1:
  58     case GL_UNSIGNED_SHORT_1_5_5_5_REV:
  59     case GL_UNSIGNED_SHORT_8_8_APPLE:
  60     case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
  61     case GL_UNSIGNED_SHORT_15_1_MESA:
  62     case GL_UNSIGNED_SHORT_1_15_REV_MESA:
  63     case GL_UNSIGNED_INT_8_8_8_8:
  64     case GL_UNSIGNED_INT_8_8_8_8_REV:
  65     case GL_UNSIGNED_INT_10_10_10_2:
  66     case GL_UNSIGNED_INT_2_10_10_10_REV:
  67     case GL_UNSIGNED_INT_24_8_NV:
  68     case GL_UNSIGNED_INT_24_8_MESA:
  69     case GL_UNSIGNED_INT_8_24_REV_MESA:
  70       return 1;
  71     default:
  72       break;
  73     }
  74
  75     switch(format) {
  76       case GL_RGB:
  77       case GL_BGR:
  78         return 3;
  79       case GL_422_EXT:
  80       case GL_422_REV_EXT:
  81       case GL_422_AVERAGE_EXT:
  82       case GL_422_REV_AVERAGE_EXT:
  83       case GL_YCBCR_422_APPLE:
  84       case GL_LUMINANCE_ALPHA:
  85         return 2;
  86       case GL_RGBA:
  87       case GL_BGRA:
  88       case GL_ABGR_EXT:
  89         return 4;
  90       case GL_COLOR_INDEX:
  91       case GL_STENCIL_INDEX:
  92       case GL_DEPTH_COMPONENT:
  93       case GL_RED:
  94       case GL_GREEN:
  95       case GL_BLUE:
  96       case GL_ALPHA:
  97       case GL_LUMINANCE:
  98       case GL_INTENSITY:
  99         return 1;
 100       default:
 101         return 0;
 102     }
 103 }
 104
 105 /*
 106 ** Return the number of bytes per element, based on the element type (other
 107 ** than GL_BITMAP).
 108 */
 109 GLint __glBytesPerElement(GLenum type)
 110 {
 111     switch(type) {
 112       case GL_UNSIGNED_SHORT:
 113       case GL_SHORT:
 114       case GL_UNSIGNED_SHORT_5_6_5:
 115       case GL_UNSIGNED_SHORT_5_6_5_REV:
 116       case GL_UNSIGNED_SHORT_4_4_4_4:
 117       case GL_UNSIGNED_SHORT_4_4_4_4_REV:
 118       case GL_UNSIGNED_SHORT_5_5_5_1:
 119       case GL_UNSIGNED_SHORT_1_5_5_5_REV:
 120       case GL_UNSIGNED_SHORT_8_8_APPLE:
 121       case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
 122       case GL_UNSIGNED_SHORT_15_1_MESA:
 123       case GL_UNSIGNED_SHORT_1_15_REV_MESA:
 124         return 2;
 125       case GL_UNSIGNED_BYTE:
 126       case GL_BYTE:
 127       case GL_UNSIGNED_BYTE_3_3_2:
 128       case GL_UNSIGNED_BYTE_2_3_3_REV:
 129         return 1;
 130       case GL_INT:
 131       case GL_UNSIGNED_INT:
 132       case GL_FLOAT:
 133       case GL_UNSIGNED_INT_8_8_8_8:
 134       case GL_UNSIGNED_INT_8_8_8_8_REV:
 135       case GL_UNSIGNED_INT_10_10_10_2:
 136       case GL_UNSIGNED_INT_2_10_10_10_REV:
 137       case GL_UNSIGNED_INT_24_8_NV:
 138       case GL_UNSIGNED_INT_24_8_MESA:
 139       case GL_UNSIGNED_INT_8_24_REV_MESA:
 140         return 4;
 141       default:
 142         return 0;
 143     }
 144 }
 145
 146 /*
 147 ** Compute memory required for internal packed array of data of given type
 148 ** and format.
 149 */
 150 GLint __glImageSize(GLsizei width, GLsizei height, GLsizei depth,
 151                     GLenum format, GLenum type, GLenum target)
 152 {
 153     int bytes_per_row;
 154     int components;
 155
 156     switch( target ) {
 157     case GL_PROXY_TEXTURE_1D:
 158     case GL_PROXY_TEXTURE_2D:
 159     case GL_PROXY_TEXTURE_3D:
 160     case GL_PROXY_TEXTURE_4D_SGIS:
 161     case GL_PROXY_TEXTURE_CUBE_MAP:
 162     case GL_PROXY_TEXTURE_RECTANGLE_ARB:
 163     case GL_PROXY_HISTOGRAM:
 164     case GL_PROXY_COLOR_TABLE:
 165     case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
 166     case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
 167     case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
 168     case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP:
 169         return 0;
 170     }
 171
 172     if (width < 0 || height < 0 || depth < 0) {
 173         return 0;
 174     }
 175
 176     /*
 177     ** Zero is returned if either format or type are invalid.
 178     */
 179     components = __glElementsPerGroup(format,type);
 180     if (type == GL_BITMAP) {
 181         if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
 182             bytes_per_row = (width + 7) >> 3;
 183         } else {
 184             return 0;
 185         }
 186     } else {
 187         bytes_per_row = __glBytesPerElement(type) * width;
 188     }
 189
 190     return bytes_per_row * height * depth * components;
 191 }