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annotate src/libraries/ddsparse/ddsparse.cpp @ 1421:aa603d1b03bc image-CompressedData

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Code cleanup
author Alex Szpakowski <slime73@gmail.com>
date Fri, 05 Apr 2013 18:55:44 -0300
parents 2a5ef265e040
children 377f9dad7a2d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1420
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1 /**
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2 * Simple DDS data parser for compressed 2D textures.
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3 *
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4 * Copyright (c) 2013 Alexander Szpakowski.
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5 *
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 * of this software and associated documentation files (the "Software"), to deal
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8 * in the Software without restriction, including without limitation the rights
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9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 * copies of the Software, and to permit persons to whom the Software is
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11 * furnished to do so, subject to the following conditions:
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12 *
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13 * The above copyright notice and this permission notice shall be included in
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14 * all copies or substantial portions of the Software.
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15 *
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 * THE SOFTWARE.
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23 **/
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24
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25 #include "ddsparse.h"
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26 #include "ddsinfo.h"
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27
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28 #include <algorithm>
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29
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30 namespace dds
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31 {
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32
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33 using namespace dds::dxinfo;
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34
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35 // Creates a packed uint representation of a FourCC code.
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36 static inline uint32_t FourCC(char a, char b, char c, char d)
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37 {
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38 uint32_t fcc = ((uint32_t) a)
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39 | (((uint32_t) b) << 8)
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40 | (((uint32_t) c) << 16)
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41 | (((uint32_t) d) << 24);
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42
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43 return fcc;
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44 }
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45
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46 Parser::Image::Image()
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47 : width(0)
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48 , height(0)
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49 , dataSize(0)
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50 , data(0)
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51 {
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52 }
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53
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54 bool Parser::isDDS(const void *data, size_t dataSize)
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55 {
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56 const uint8_t *readData = (const uint8_t *) data;
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57 ptrdiff_t offset = 0;
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58
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59 // Is the data large enough to hold the DDS header?
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60 if(dataSize < sizeof(uint32_t) + sizeof(DDSHeader))
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61 return false;
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62
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63 // All DDS files start with "DDS ".
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64 if((*(uint32_t *) readData) != FourCC('D','D','S',' '))
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65 return false;
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66
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67 offset += sizeof(uint32_t);
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68
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69 DDSHeader *header = (DDSHeader *) &readData[offset];
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71
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72 // Verify header to validate DDS data.
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73 if (header->size != sizeof(DDSHeader) || header->format.size != sizeof(DDSPixelFormat))
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74 return false;
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75
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76 offset += sizeof(DDSHeader);
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77
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78 // Check for DX10 extension.
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79 if ((header->format.flags & DDPF_FOURCC) && (header->format.fourCC == FourCC('D','X','1','0')))
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80 {
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81 // Data must be big enough for both headers plus the magic value.
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82 if (dataSize < (sizeof(uint32_t) + sizeof(DDSHeader) + sizeof(DDSHeader10)))
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83 return false;
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84 }
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85
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86 return true;
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87 }
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88
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89 Parser::Parser(const void *data, size_t dataSize, Options opts)
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90 : format(FORMAT_UNKNOWN)
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91 , options(opts)
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92 {
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93 parseData(data, dataSize);
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94 }
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95
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96 Parser::Parser(const Parser &other)
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97 : format(other.format)
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98 , options(other.options)
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99 {
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100 std::vector<Image>::const_iterator it;
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101 for (it = other.texData.begin(); it != other.texData.end(); ++it)
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102 {
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103 Image img = *it;
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104
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105 if ((options & OPTIONS_COPY_DATA) && img.dataSize > 0)
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106 {
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107 uint8_t *data = 0;
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108 try
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109 {
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110 data = new uint8_t[img.dataSize];
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111 }
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112 catch (std::exception &)
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113 {
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114 clearData();
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115 throw;
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116 }
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117 memcpy(data, it->data, img.dataSize);
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118 img.data = data;
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119 }
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120
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121 texData.push_back(img);
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122 }
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123 }
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124
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125 Parser::~Parser()
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126 {
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127 // Delete any data we created.
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128 clearData();
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129 }
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130
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131 Format Parser::getFormat() const
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132 {
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133 return format;
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134 }
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135
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136 const Parser::Image *Parser::getImageData(size_t miplevel) const
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137 {
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138 if (miplevel >= texData.size())
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139 return 0;
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140
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141 return &texData[miplevel];
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142 }
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143
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144 size_t Parser::getNumMipmaps() const
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145 {
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146 return texData.size();
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147 }
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148
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149 bool Parser::ownsData() const
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150 {
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151 return (options & OPTIONS_COPY_DATA) != 0;
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152 }
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153
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154 Format Parser::parseDDSFormat(const DDSPixelFormat &fmt) const
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155 {
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156 if (fmt.flags & DDPF_FOURCC)
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157 {
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158 if (fmt.fourCC == FourCC('D','X','T','1'))
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159 return FORMAT_DXT1;
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160 else if (fmt.fourCC == FourCC('D','X','T','3'))
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161 return FORMAT_DXT3;
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162 else if (fmt.fourCC == FourCC('D','X','T','5'))
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163 return FORMAT_DXT5;
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164 else if (fmt.fourCC == FourCC('A','T','I','2'))
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165 return FORMAT_BC5;
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166 else if (fmt.fourCC == FourCC('B','C','5','S'))
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167 return FORMAT_BC5s;
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168 }
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169
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170 return FORMAT_UNKNOWN;
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171 }
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172
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173 Format Parser::parseDX10Format(DXGIFormat fmt) const
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174 {
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175 Format f = FORMAT_UNKNOWN;
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176
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177 switch (fmt)
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178 {
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179 case DXGI_FORMAT_BC1_TYPELESS:
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180 case DXGI_FORMAT_BC1_UNORM:
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181 case DXGI_FORMAT_BC1_UNORM_SRGB:
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182 f = FORMAT_DXT1;
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183 break;
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184 case DXGI_FORMAT_BC2_TYPELESS:
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185 case DXGI_FORMAT_BC2_UNORM:
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186 case DXGI_FORMAT_BC2_UNORM_SRGB:
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187 f = FORMAT_DXT3;
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188 break;
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189 case DXGI_FORMAT_BC3_TYPELESS:
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190 case DXGI_FORMAT_BC3_UNORM:
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191 case DXGI_FORMAT_BC3_UNORM_SRGB:
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192 f = FORMAT_DXT5;
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193 break;
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194 case DXGI_FORMAT_BC5_SNORM:
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195 f = FORMAT_BC5s;
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196 break;
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197 case DXGI_FORMAT_BC5_TYPELESS:
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198 case DXGI_FORMAT_BC5_UNORM:
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199 f = FORMAT_BC5;
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200 break;
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201 case DXGI_FORMAT_BC7_TYPELESS:
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202 case DXGI_FORMAT_BC7_UNORM:
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203 f = FORMAT_BC7;
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204 break;
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205 case DXGI_FORMAT_BC7_UNORM_SRGB:
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206 f = FORMAT_BC7srgb;
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207 default:
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208 break;
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209 }
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210
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211 return f;
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212 }
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213
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214 size_t Parser::parseImageSize(Format fmt, int width, int height) const
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215 {
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216 size_t size = 0;
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217
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218 switch (fmt)
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219 {
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220 case FORMAT_DXT1:
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221 case FORMAT_DXT3:
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222 case FORMAT_DXT5:
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223 case FORMAT_BC5s:
1421
aa603d1b03bc Code cleanup
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224 case FORMAT_BC5:
1420
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225 case FORMAT_BC7:
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226 case FORMAT_BC7srgb:
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227 {
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228 int numBlocksWide = 0;
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229 if (width > 0)
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230 numBlocksWide = std::max(1, (width + 3) / 4);
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231
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232 int numBlocksHigh = 0;
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233 if (height > 0)
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234 numBlocksHigh = std::max(1, (height + 3) / 4);
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235
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236 int numBytesPerBlock = (fmt == FORMAT_DXT1 ? 8 : 16);
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237
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238 size = numBlocksWide * numBytesPerBlock * numBlocksHigh;
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239 }
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240 break;
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241 default:
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242 break;
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243 }
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244
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245 return size;
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246 }
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247
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248 bool Parser::parseTexData(const uint8_t *data, size_t dataSize, Format fmt, int w, int h, int mips)
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249 {
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250 size_t offset = 0;
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251
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252 for (int i = 0; i < mips; i++)
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253 {
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254 Image img;
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255 img.width = w;
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256 img.height = h;
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257
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258 img.dataSize = parseImageSize(fmt, img.width, img.height);
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259
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260 // Make sure the data size is valid.
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261 if (img.dataSize == 0 || (offset + img.dataSize) > dataSize)
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262 {
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263 // Clean up any data we allocated previously.
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264 clearData();
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265 return false;
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266 }
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267
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268 // Create our own copy of the data, if requested.
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269 if (options & OPTIONS_COPY_DATA)
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270 {
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271 uint8_t *newData = 0;
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272 try
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273 {
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274 newData = new uint8_t[img.dataSize];
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275 }
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276 catch (std::exception &)
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277 {
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278 // Clean up before throwing.
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279 clearData();
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280 throw;
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281 }
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282 memcpy(newData, &data[offset], img.dataSize);
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283 img.data = newData;
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284 }
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285 else
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286 img.data = &data[offset];
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287
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288 texData.push_back(img);
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289
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290 // Move to the next mip level.
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291 offset += img.dataSize;
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292
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293 w = std::max(w / 2, 1);
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294 h = std::max(h / 2, 1);
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295 }
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296
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297 return true;
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298 }
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299
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300 bool Parser::parseData(const void *data, size_t dataSize)
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301 {
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302 if (!isDDS(data, dataSize))
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303 return false;
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304
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305 const uint8_t *readData = (const uint8_t *) data;
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306 ptrdiff_t offset = sizeof(uint32_t);
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307
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308 DDSHeader *header = (DDSHeader *) &readData[offset];
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309 offset += sizeof(DDSHeader);
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310
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311
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312 // Check for DX10 extension.
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313 if ((header->format.flags & DDPF_FOURCC) && (header->format.fourCC == FourCC('D','X','1','0')))
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314 {
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315 DDSHeader10 *header10 = (DDSHeader10 *) &readData[offset];
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316 offset += sizeof(DDSHeader10);
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317
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318 // We can't deal with 1D/3D textures.
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319 switch (header10->resourceDimension)
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320 {
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321 case D3D10_RESOURCE_DIMENSION_TEXTURE2D:
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322 case D3D10_RESOURCE_DIMENSION_UNKNOWN:
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323 break;
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324 default:
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325 return false;
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326 }
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327
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328 // We also can't deal with texture arrays and cubemaps.
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329 if (header10->arraySize > 1)
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330 return false;
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331
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332 format = parseDX10Format(header10->dxgiFormat);
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333 }
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334 else
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335 format = parseDDSFormat(header->format);
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336
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337
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338 if (format == FORMAT_UNKNOWN)
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339 return false;
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340
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341
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342 int w = header->width;
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343 int h = header->height;
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344
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345 int mips = std::max((int) header->mipMapCount, 1);
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346
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347 return parseTexData(&readData[offset], dataSize - offset, format, w, h, mips);
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348 }
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349
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350 void Parser::clearData()
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351 {
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352 if (options & OPTIONS_COPY_DATA)
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353 {
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354 // Delete any data we created.
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355 std::vector<Image>::iterator it;
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356 for (it = texData.begin(); it != texData.end(); ++it)
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357 {
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358 delete[] it->data;
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359 it->data = 0;
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360 }
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361 }
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362
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363 texData.clear();
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364 }
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365
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366 } // dds