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 __glElementsPerGroup(GLenum format, GLenum type)
  40 {
  41     /*
  42     ** To make row length computation valid for image extraction,
  43     ** packed pixel types assume elements per group equals one.
  44     */
  45     switch(type) {
  46     case GL_UNSIGNED_BYTE_3_3_2:
  47     case GL_UNSIGNED_BYTE_2_3_3_REV:
  48     case GL_UNSIGNED_SHORT_5_6_5:
  49     case GL_UNSIGNED_SHORT_5_6_5_REV:
  50     case GL_UNSIGNED_SHORT_4_4_4_4:
  51     case GL_UNSIGNED_SHORT_4_4_4_4_REV:
  52     case GL_UNSIGNED_SHORT_5_5_5_1:
  53     case GL_UNSIGNED_SHORT_1_5_5_5_REV:
  54     case GL_UNSIGNED_SHORT_8_8_APPLE:
  55     case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
  56     case GL_UNSIGNED_SHORT_15_1_MESA:
  57     case GL_UNSIGNED_SHORT_1_15_REV_MESA:
  58     case GL_UNSIGNED_INT_8_8_8_8:
  59     case GL_UNSIGNED_INT_8_8_8_8_REV:
  60     case GL_UNSIGNED_INT_10_10_10_2:
  61     case GL_UNSIGNED_INT_2_10_10_10_REV:
  62     case GL_UNSIGNED_INT_24_8_NV:
  63     case GL_UNSIGNED_INT_24_8_MESA:
  64     case GL_UNSIGNED_INT_8_24_REV_MESA:
  65       return 1;
  66     default:
  67       break;
  68     }
  69
  70     switch(format) {
  71       case GL_RGB:
  72       case GL_BGR:
  73         return 3;
  74       case GL_422_EXT:
  75       case GL_422_REV_EXT:
  76       case GL_422_AVERAGE_EXT:
  77       case GL_422_REV_AVERAGE_EXT:
  78       case GL_YCBCR_422_APPLE:
  79       case GL_LUMINANCE_ALPHA:
  80         return 2;
  81       case GL_RGBA:
  82       case GL_BGRA:
  83       case GL_ABGR_EXT:
  84         return 4;
  85       case GL_COLOR_INDEX:
  86       case GL_STENCIL_INDEX:
  87       case GL_DEPTH_COMPONENT:
  88       case GL_RED:
  89       case GL_GREEN:
  90       case GL_BLUE:
  91       case GL_ALPHA:
  92       case GL_LUMINANCE:
  93       case GL_INTENSITY:
  94         return 1;
  95       default:
  96         return 0;
  97     }
  98 }
  99
 100 /*
 101 ** Return the number of bytes per element, based on the element type (other
 102 ** than GL_BITMAP).
 103 */
 104 GLint __glBytesPerElement(GLenum type)
 105 {
 106     switch(type) {
 107       case GL_UNSIGNED_SHORT:
 108       case GL_SHORT:
 109       case GL_UNSIGNED_SHORT_5_6_5:
 110       case GL_UNSIGNED_SHORT_5_6_5_REV:
 111       case GL_UNSIGNED_SHORT_4_4_4_4:
 112       case GL_UNSIGNED_SHORT_4_4_4_4_REV:
 113       case GL_UNSIGNED_SHORT_5_5_5_1:
 114       case GL_UNSIGNED_SHORT_1_5_5_5_REV:
 115       case GL_UNSIGNED_SHORT_8_8_APPLE:
 116       case GL_UNSIGNED_SHORT_8_8_REV_APPLE:
 117       case GL_UNSIGNED_SHORT_15_1_MESA:
 118       case GL_UNSIGNED_SHORT_1_15_REV_MESA:
 119         return 2;
 120       case GL_UNSIGNED_BYTE:
 121       case GL_BYTE:
 122       case GL_UNSIGNED_BYTE_3_3_2:
 123       case GL_UNSIGNED_BYTE_2_3_3_REV:
 124         return 1;
 125       case GL_INT:
 126       case GL_UNSIGNED_INT:
 127       case GL_FLOAT:
 128       case GL_UNSIGNED_INT_8_8_8_8:
 129       case GL_UNSIGNED_INT_8_8_8_8_REV:
 130       case GL_UNSIGNED_INT_10_10_10_2:
 131       case GL_UNSIGNED_INT_2_10_10_10_REV:
 132       case GL_UNSIGNED_INT_24_8_NV:
 133       case GL_UNSIGNED_INT_24_8_MESA:
 134       case GL_UNSIGNED_INT_8_24_REV_MESA:
 135         return 4;
 136       default:
 137         return 0;
 138     }
 139 }
 140
 141 /*
 142 ** Compute memory required for internal packed array of data of given type
 143 ** and format.
 144 */
 145 GLint __glImageSize(GLsizei width, GLsizei height, GLsizei depth,
 146                     GLenum format, GLenum type, GLenum target)
 147 {
 148     int bytes_per_row;
 149     int components;
 150
 151     switch( target ) {
 152     case GL_PROXY_TEXTURE_1D:
 153     case GL_PROXY_TEXTURE_2D:
 154     case GL_PROXY_TEXTURE_3D:
 155     case GL_PROXY_TEXTURE_4D_SGIS:
 156     case GL_PROXY_TEXTURE_CUBE_MAP:
 157     case GL_PROXY_TEXTURE_RECTANGLE_ARB:
 158     case GL_PROXY_HISTOGRAM:
 159     case GL_PROXY_COLOR_TABLE:
 160     case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
 161     case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
 162     case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
 163     case GL_PROXY_POST_IMAGE_TRANSFORM_COLOR_TABLE_HP:
 164         return 0;
 165     }
 166
 167     if (width < 0 || height < 0 || depth < 0) {
 168         return 0;
 169     }
 170
 171     /*
 172     ** Zero is returned if either format or type are invalid.
 173     */
 174     components = __glElementsPerGroup(format,type);
 175     if (type == GL_BITMAP) {
 176         if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
 177             bytes_per_row = (width + 7) >> 3;
 178         } else {
 179             return 0;
 180         }
 181     } else {
 182         bytes_per_row = __glBytesPerElement(type) * width;
 183     }
 184
 185     return bytes_per_row * height * depth * components;
 186 }