src/glx/x11/compsize.c

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