1 | /* |
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2 | * Copyright (c) 1997 Greg Ward Larson |
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3 | * Copyright (c) 1997 Silicon Graphics, Inc. |
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4 | * |
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5 | * Permission to use, copy, modify, distribute, and sell this software and |
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6 | * its documentation for any purpose is hereby granted without fee, provided |
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7 | * that (i) the above copyright notices and this permission notice appear in |
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8 | * all copies of the software and related documentation, and (ii) the names of |
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9 | * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any |
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10 | * advertising or publicity relating to the software without the specific, |
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11 | * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics. |
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12 | * |
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13 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
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14 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
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15 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
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16 | * |
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17 | * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE |
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18 | * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
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19 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
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20 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
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21 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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22 | * OF THIS SOFTWARE. |
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23 | */ |
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24 | |
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25 | #include "tiffiop.h" |
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26 | #ifdef LOGLUV_SUPPORT |
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27 | |
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28 | /* |
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29 | * TIFF Library. |
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30 | * LogLuv compression support for high dynamic range images. |
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31 | * |
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32 | * Contributed by Greg Larson. |
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33 | * |
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34 | * LogLuv image support uses the TIFF library to store 16 or 10-bit |
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35 | * log luminance values with 8 bits each of u and v or a 14-bit index. |
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36 | * |
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37 | * The codec can take as input and produce as output 32-bit IEEE float values |
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38 | * as well as 16-bit integer values. A 16-bit luminance is interpreted |
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39 | * as a sign bit followed by a 15-bit integer that is converted |
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40 | * to and from a linear magnitude using the transformation: |
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41 | * |
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42 | * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit |
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43 | * |
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44 | * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real |
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45 | * |
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46 | * The actual conversion to world luminance units in candelas per sq. meter |
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47 | * requires an additional multiplier, which is stored in the TIFFTAG_STONITS. |
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48 | * This value is usually set such that a reasonable exposure comes from |
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49 | * clamping decoded luminances above 1 to 1 in the displayed image. |
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50 | * |
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51 | * The 16-bit values for u and v may be converted to real values by dividing |
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52 | * each by 32768. (This allows for negative values, which aren't useful as |
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53 | * far as we know, but are left in case of future improvements in human |
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54 | * color vision.) |
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55 | * |
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56 | * Conversion from (u,v), which is actually the CIE (u',v') system for |
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57 | * you color scientists, is accomplished by the following transformation: |
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58 | * |
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59 | * u = 4*x / (-2*x + 12*y + 3) |
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60 | * v = 9*y / (-2*x + 12*y + 3) |
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61 | * |
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62 | * x = 9*u / (6*u - 16*v + 12) |
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63 | * y = 4*v / (6*u - 16*v + 12) |
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64 | * |
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65 | * This process is greatly simplified by passing 32-bit IEEE floats |
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66 | * for each of three CIE XYZ coordinates. The codec then takes care |
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67 | * of conversion to and from LogLuv, though the application is still |
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68 | * responsible for interpreting the TIFFTAG_STONITS calibration factor. |
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69 | * |
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70 | * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white |
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71 | * point of (x,y)=(1/3,1/3). However, most color systems assume some other |
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72 | * white point, such as D65, and an absolute color conversion to XYZ then |
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73 | * to another color space with a different white point may introduce an |
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74 | * unwanted color cast to the image. It is often desirable, therefore, to |
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75 | * perform a white point conversion that maps the input white to [1 1 1] |
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76 | * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT |
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77 | * tag value. A decoder that demands absolute color calibration may use |
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78 | * this white point tag to get back the original colors, but usually it |
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79 | * will be ignored and the new white point will be used instead that |
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80 | * matches the output color space. |
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81 | * |
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82 | * Pixel information is compressed into one of two basic encodings, depending |
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83 | * on the setting of the compression tag, which is one of COMPRESSION_SGILOG |
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84 | * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is |
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85 | * stored as: |
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86 | * |
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87 | * 1 15 |
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88 | * |-+---------------| |
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89 | * |
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90 | * COMPRESSION_SGILOG color data is stored as: |
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91 | * |
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92 | * 1 15 8 8 |
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93 | * |-+---------------|--------+--------| |
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94 | * S Le ue ve |
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95 | * |
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96 | * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as: |
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97 | * |
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98 | * 10 14 |
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99 | * |----------|--------------| |
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100 | * Le' Ce |
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101 | * |
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102 | * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is |
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103 | * encoded as an index for optimal color resolution. The 10 log bits are |
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104 | * defined by the following conversions: |
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105 | * |
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106 | * L = 2^((Le'+.5)/64 - 12) # real from 10-bit |
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107 | * |
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108 | * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real |
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109 | * |
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110 | * The 10 bits of the smaller format may be converted into the 15 bits of |
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111 | * the larger format by multiplying by 4 and adding 13314. Obviously, |
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112 | * a smaller range of magnitudes is covered (about 5 orders of magnitude |
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113 | * instead of 38), and the lack of a sign bit means that negative luminances |
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114 | * are not allowed. (Well, they aren't allowed in the real world, either, |
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115 | * but they are useful for certain types of image processing.) |
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116 | * |
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117 | * The desired user format is controlled by the setting the internal |
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118 | * pseudo tag TIFFTAG_SGILOGDATAFMT to one of: |
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119 | * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values |
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120 | * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v |
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121 | * Raw data i/o is also possible using: |
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122 | * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel |
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123 | * In addition, the following decoding is provided for ease of display: |
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124 | * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values |
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125 | * |
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126 | * For grayscale images, we provide the following data formats: |
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127 | * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values |
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128 | * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance |
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129 | * SGILOGDATAFMT_8BIT = 8-bit gray monitor values |
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130 | * |
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131 | * Note that the COMPRESSION_SGILOG applies a simple run-length encoding |
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132 | * scheme by separating the logL, u and v bytes for each row and applying |
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133 | * a PackBits type of compression. Since the 24-bit encoding is not |
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134 | * adaptive, the 32-bit color format takes less space in many cases. |
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135 | * |
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136 | * Further control is provided over the conversion from higher-resolution |
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137 | * formats to final encoded values through the pseudo tag |
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138 | * TIFFTAG_SGILOGENCODE: |
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139 | * SGILOGENCODE_NODITHER = do not dither encoded values |
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140 | * SGILOGENCODE_RANDITHER = apply random dithering during encoding |
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141 | * |
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142 | * The default value of this tag is SGILOGENCODE_NODITHER for |
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143 | * COMPRESSION_SGILOG to maximize run-length encoding and |
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144 | * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn |
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145 | * quantization errors into noise. |
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146 | */ |
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147 | |
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148 | #include <stdio.h> |
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149 | #include <assert.h> |
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150 | #include <stdlib.h> |
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151 | #include <math.h> |
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152 | |
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153 | /* |
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154 | * State block for each open TIFF |
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155 | * file using LogLuv compression/decompression. |
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156 | */ |
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157 | typedef struct logLuvState LogLuvState; |
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158 | |
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159 | struct logLuvState { |
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160 | int user_datafmt; /* user data format */ |
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161 | int encode_meth; /* encoding method */ |
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162 | int pixel_size; /* bytes per pixel */ |
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163 | |
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164 | tidata_t* tbuf; /* translation buffer */ |
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165 | int tbuflen; /* buffer length */ |
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166 | void (*tfunc)(LogLuvState*, tidata_t, int); |
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167 | |
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168 | TIFFVSetMethod vgetparent; /* super-class method */ |
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169 | TIFFVSetMethod vsetparent; /* super-class method */ |
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170 | }; |
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171 | |
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172 | #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data) |
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173 | #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data) |
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174 | |
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175 | #define N(a) (sizeof(a)/sizeof(a[0])) |
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176 | #define SGILOGDATAFMT_UNKNOWN -1 |
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177 | |
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178 | #define MINRUN 4 /* minimum run length */ |
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179 | |
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180 | /* |
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181 | * Decode a string of 16-bit gray pixels. |
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182 | */ |
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183 | static int |
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184 | LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s) |
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185 | { |
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186 | LogLuvState* sp = DecoderState(tif); |
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187 | int shft, i, npixels; |
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188 | u_char* bp; |
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189 | int16* tp; |
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190 | int16 b; |
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191 | int cc, rc; |
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192 | |
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193 | assert(s == 0); |
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194 | assert(sp != NULL); |
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195 | |
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196 | npixels = occ / sp->pixel_size; |
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197 | |
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198 | if (sp->user_datafmt == SGILOGDATAFMT_16BIT) |
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199 | tp = (int16*) op; |
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200 | else { |
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201 | assert(sp->tbuflen >= npixels); |
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202 | tp = (int16*) sp->tbuf; |
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203 | } |
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204 | _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0])); |
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205 | |
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206 | bp = (u_char*) tif->tif_rawcp; |
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207 | cc = tif->tif_rawcc; |
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208 | /* get each byte string */ |
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209 | for (shft = 2*8; (shft -= 8) >= 0; ) { |
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210 | for (i = 0; i < npixels && cc > 0; ) |
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211 | if (*bp >= 128) { /* run */ |
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212 | rc = *bp++ + (2-128); |
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213 | b = (int16)*bp++ << shft; |
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214 | cc -= 2; |
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215 | while (rc--) |
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216 | tp[i++] |= b; |
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217 | } else { /* non-run */ |
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218 | rc = *bp++; /* nul is noop */ |
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219 | while (--cc && rc--) |
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220 | tp[i++] |= (int16)*bp++ << shft; |
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221 | } |
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222 | if (i != npixels) { |
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223 | TIFFError(tif->tif_name, |
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224 | "LogL16Decode: Not enough data at row %d (short %d pixels)", |
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225 | tif->tif_row, npixels - i); |
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226 | tif->tif_rawcp = (tidata_t) bp; |
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227 | tif->tif_rawcc = cc; |
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228 | return (0); |
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229 | } |
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230 | } |
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231 | (*sp->tfunc)(sp, op, npixels); |
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232 | tif->tif_rawcp = (tidata_t) bp; |
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233 | tif->tif_rawcc = cc; |
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234 | return (1); |
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235 | } |
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236 | |
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237 | /* |
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238 | * Decode a string of 24-bit pixels. |
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239 | */ |
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240 | static int |
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241 | LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s) |
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242 | { |
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243 | LogLuvState* sp = DecoderState(tif); |
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244 | int cc, i, npixels; |
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245 | u_char* bp; |
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246 | uint32* tp; |
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247 | |
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248 | assert(s == 0); |
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249 | assert(sp != NULL); |
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250 | |
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251 | npixels = occ / sp->pixel_size; |
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252 | |
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253 | if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
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254 | tp = (uint32 *)op; |
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255 | else { |
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256 | assert(sp->tbuflen >= npixels); |
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257 | tp = (uint32 *) sp->tbuf; |
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258 | } |
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259 | /* copy to array of uint32 */ |
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260 | bp = (u_char*) tif->tif_rawcp; |
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261 | cc = tif->tif_rawcc; |
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262 | for (i = 0; i < npixels && cc > 0; i++) { |
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263 | tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; |
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264 | bp += 3; |
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265 | cc -= 3; |
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266 | } |
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267 | tif->tif_rawcp = (tidata_t) bp; |
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268 | tif->tif_rawcc = cc; |
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269 | if (i != npixels) { |
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270 | TIFFError(tif->tif_name, |
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271 | "LogLuvDecode24: Not enough data at row %d (short %d pixels)", |
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272 | tif->tif_row, npixels - i); |
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273 | return (0); |
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274 | } |
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275 | (*sp->tfunc)(sp, op, npixels); |
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276 | return (1); |
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277 | } |
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278 | |
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279 | /* |
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280 | * Decode a string of 32-bit pixels. |
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281 | */ |
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282 | static int |
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283 | LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s) |
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284 | { |
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285 | LogLuvState* sp; |
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286 | int shft, i, npixels; |
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287 | u_char* bp; |
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288 | uint32* tp; |
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289 | uint32 b; |
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290 | int cc, rc; |
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291 | |
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292 | assert(s == 0); |
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293 | sp = DecoderState(tif); |
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294 | assert(sp != NULL); |
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295 | |
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296 | npixels = occ / sp->pixel_size; |
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297 | |
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298 | if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
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299 | tp = (uint32*) op; |
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300 | else { |
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301 | assert(sp->tbuflen >= npixels); |
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302 | tp = (uint32*) sp->tbuf; |
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303 | } |
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304 | _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0])); |
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305 | |
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306 | bp = (u_char*) tif->tif_rawcp; |
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307 | cc = tif->tif_rawcc; |
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308 | /* get each byte string */ |
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309 | for (shft = 4*8; (shft -= 8) >= 0; ) { |
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310 | for (i = 0; i < npixels && cc > 0; ) |
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311 | if (*bp >= 128) { /* run */ |
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312 | rc = *bp++ + (2-128); |
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313 | b = (uint32)*bp++ << shft; |
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314 | cc -= 2; |
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315 | while (rc--) |
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316 | tp[i++] |= b; |
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317 | } else { /* non-run */ |
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318 | rc = *bp++; /* nul is noop */ |
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319 | while (--cc && rc--) |
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320 | tp[i++] |= (uint32)*bp++ << shft; |
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321 | } |
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322 | if (i != npixels) { |
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323 | TIFFError(tif->tif_name, |
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324 | "LogLuvDecode32: Not enough data at row %d (short %d pixels)", |
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325 | tif->tif_row, npixels - i); |
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326 | tif->tif_rawcp = (tidata_t) bp; |
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327 | tif->tif_rawcc = cc; |
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328 | return (0); |
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329 | } |
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330 | } |
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331 | (*sp->tfunc)(sp, op, npixels); |
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332 | tif->tif_rawcp = (tidata_t) bp; |
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333 | tif->tif_rawcc = cc; |
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334 | return (1); |
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335 | } |
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336 | |
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337 | /* |
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338 | * Decode a strip of pixels. We break it into rows to |
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339 | * maintain synchrony with the encode algorithm, which |
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340 | * is row by row. |
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341 | */ |
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342 | static int |
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343 | LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
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344 | { |
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345 | tsize_t rowlen = TIFFScanlineSize(tif); |
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346 | |
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347 | assert(cc%rowlen == 0); |
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348 | while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) |
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349 | bp += rowlen, cc -= rowlen; |
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350 | return (cc == 0); |
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351 | } |
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352 | |
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353 | /* |
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354 | * Decode a tile of pixels. We break it into rows to |
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355 | * maintain synchrony with the encode algorithm, which |
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356 | * is row by row. |
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357 | */ |
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358 | static int |
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359 | LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
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360 | { |
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361 | tsize_t rowlen = TIFFTileRowSize(tif); |
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362 | |
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363 | assert(cc%rowlen == 0); |
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364 | while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) |
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365 | bp += rowlen, cc -= rowlen; |
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366 | return (cc == 0); |
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367 | } |
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368 | |
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369 | /* |
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370 | * Encode a row of 16-bit pixels. |
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371 | */ |
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372 | static int |
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373 | LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
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374 | { |
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375 | LogLuvState* sp = EncoderState(tif); |
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376 | int shft, i, j, npixels; |
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377 | tidata_t op; |
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378 | int16* tp; |
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379 | int16 b; |
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380 | int occ, rc=0, mask, beg; |
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381 | |
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382 | assert(s == 0); |
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383 | assert(sp != NULL); |
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384 | npixels = cc / sp->pixel_size; |
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385 | |
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386 | if (sp->user_datafmt == SGILOGDATAFMT_16BIT) |
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387 | tp = (int16*) bp; |
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388 | else { |
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389 | tp = (int16*) sp->tbuf; |
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390 | assert(sp->tbuflen >= npixels); |
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391 | (*sp->tfunc)(sp, bp, npixels); |
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392 | } |
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393 | /* compress each byte string */ |
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394 | op = tif->tif_rawcp; |
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395 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
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396 | for (shft = 2*8; (shft -= 8) >= 0; ) |
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397 | for (i = 0; i < npixels; i += rc) { |
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398 | if (occ < 4) { |
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399 | tif->tif_rawcp = op; |
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400 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
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401 | if (!TIFFFlushData1(tif)) |
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402 | return (-1); |
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403 | op = tif->tif_rawcp; |
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404 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
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405 | } |
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406 | mask = 0xff << shft; /* find next run */ |
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407 | for (beg = i; beg < npixels; beg += rc) { |
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408 | b = tp[beg] & mask; |
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409 | rc = 1; |
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410 | while (rc < 127+2 && beg+rc < npixels && |
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411 | (tp[beg+rc] & mask) == b) |
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412 | rc++; |
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413 | if (rc >= MINRUN) |
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414 | break; /* long enough */ |
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415 | } |
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416 | if (beg-i > 1 && beg-i < MINRUN) { |
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417 | b = tp[i] & mask; /* check short run */ |
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418 | j = i+1; |
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419 | while ((tp[j++] & mask) == b) |
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420 | if (j == beg) { |
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421 | *op++ = 128-2+j-i; |
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422 | *op++ = b >> shft; |
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423 | occ -= 2; |
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424 | i = beg; |
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425 | break; |
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426 | } |
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427 | } |
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428 | while (i < beg) { /* write out non-run */ |
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429 | if ((j = beg-i) > 127) j = 127; |
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430 | if (occ < j+3) { |
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431 | tif->tif_rawcp = op; |
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432 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
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433 | if (!TIFFFlushData1(tif)) |
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434 | return (-1); |
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435 | op = tif->tif_rawcp; |
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436 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
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437 | } |
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438 | *op++ = j; occ--; |
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439 | while (j--) { |
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440 | *op++ = tp[i++] >> shft & 0xff; |
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441 | occ--; |
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442 | } |
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443 | } |
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444 | if (rc >= MINRUN) { /* write out run */ |
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445 | *op++ = 128-2+rc; |
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446 | *op++ = tp[beg] >> shft & 0xff; |
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447 | occ -= 2; |
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448 | } else |
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449 | rc = 0; |
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450 | } |
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451 | tif->tif_rawcp = op; |
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452 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
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453 | |
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454 | return (0); |
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455 | } |
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456 | |
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457 | /* |
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458 | * Encode a row of 24-bit pixels. |
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459 | */ |
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460 | static int |
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461 | LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
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462 | { |
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463 | LogLuvState* sp = EncoderState(tif); |
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464 | int i, npixels, occ; |
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465 | tidata_t op; |
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466 | uint32* tp; |
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467 | |
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468 | assert(s == 0); |
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469 | assert(sp != NULL); |
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470 | npixels = cc / sp->pixel_size; |
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471 | |
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472 | if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
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473 | tp = (uint32*) bp; |
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474 | else { |
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475 | tp = (uint32*) sp->tbuf; |
---|
476 | assert(sp->tbuflen >= npixels); |
---|
477 | (*sp->tfunc)(sp, bp, npixels); |
---|
478 | } |
---|
479 | /* write out encoded pixels */ |
---|
480 | op = tif->tif_rawcp; |
---|
481 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
---|
482 | for (i = npixels; i--; ) { |
---|
483 | if (occ < 3) { |
---|
484 | tif->tif_rawcp = op; |
---|
485 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
---|
486 | if (!TIFFFlushData1(tif)) |
---|
487 | return (-1); |
---|
488 | op = tif->tif_rawcp; |
---|
489 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
---|
490 | } |
---|
491 | *op++ = (tidataval_t)(*tp >> 16); |
---|
492 | *op++ = (tidataval_t)(*tp >> 8 & 0xff); |
---|
493 | *op++ = (tidataval_t)(*tp++ & 0xff); |
---|
494 | occ -= 3; |
---|
495 | } |
---|
496 | tif->tif_rawcp = op; |
---|
497 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
---|
498 | |
---|
499 | return (0); |
---|
500 | } |
---|
501 | |
---|
502 | /* |
---|
503 | * Encode a row of 32-bit pixels. |
---|
504 | */ |
---|
505 | static int |
---|
506 | LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
---|
507 | { |
---|
508 | LogLuvState* sp = EncoderState(tif); |
---|
509 | int shft, i, j, npixels; |
---|
510 | tidata_t op; |
---|
511 | uint32* tp; |
---|
512 | uint32 b; |
---|
513 | int occ, rc=0, mask, beg; |
---|
514 | |
---|
515 | assert(s == 0); |
---|
516 | assert(sp != NULL); |
---|
517 | |
---|
518 | npixels = cc / sp->pixel_size; |
---|
519 | |
---|
520 | if (sp->user_datafmt == SGILOGDATAFMT_RAW) |
---|
521 | tp = (uint32*) bp; |
---|
522 | else { |
---|
523 | tp = (uint32*) sp->tbuf; |
---|
524 | assert(sp->tbuflen >= npixels); |
---|
525 | (*sp->tfunc)(sp, bp, npixels); |
---|
526 | } |
---|
527 | /* compress each byte string */ |
---|
528 | op = tif->tif_rawcp; |
---|
529 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
---|
530 | for (shft = 4*8; (shft -= 8) >= 0; ) |
---|
531 | for (i = 0; i < npixels; i += rc) { |
---|
532 | if (occ < 4) { |
---|
533 | tif->tif_rawcp = op; |
---|
534 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
---|
535 | if (!TIFFFlushData1(tif)) |
---|
536 | return (-1); |
---|
537 | op = tif->tif_rawcp; |
---|
538 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
---|
539 | } |
---|
540 | mask = 0xff << shft; /* find next run */ |
---|
541 | for (beg = i; beg < npixels; beg += rc) { |
---|
542 | b = tp[beg] & mask; |
---|
543 | rc = 1; |
---|
544 | while (rc < 127+2 && beg+rc < npixels && |
---|
545 | (tp[beg+rc] & mask) == b) |
---|
546 | rc++; |
---|
547 | if (rc >= MINRUN) |
---|
548 | break; /* long enough */ |
---|
549 | } |
---|
550 | if (beg-i > 1 && beg-i < MINRUN) { |
---|
551 | b = tp[i] & mask; /* check short run */ |
---|
552 | j = i+1; |
---|
553 | while ((tp[j++] & mask) == b) |
---|
554 | if (j == beg) { |
---|
555 | *op++ = (tidataval_t)(128-2+j-i); |
---|
556 | *op++ = (tidataval_t)(b >> shft); |
---|
557 | occ -= 2; |
---|
558 | i = beg; |
---|
559 | break; |
---|
560 | } |
---|
561 | } |
---|
562 | while (i < beg) { /* write out non-run */ |
---|
563 | if ((j = beg-i) > 127) j = 127; |
---|
564 | if (occ < j+3) { |
---|
565 | tif->tif_rawcp = op; |
---|
566 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
---|
567 | if (!TIFFFlushData1(tif)) |
---|
568 | return (-1); |
---|
569 | op = tif->tif_rawcp; |
---|
570 | occ = tif->tif_rawdatasize - tif->tif_rawcc; |
---|
571 | } |
---|
572 | *op++ = j; occ--; |
---|
573 | while (j--) { |
---|
574 | *op++ = (tidataval_t)(tp[i++] >> shft & 0xff); |
---|
575 | occ--; |
---|
576 | } |
---|
577 | } |
---|
578 | if (rc >= MINRUN) { /* write out run */ |
---|
579 | *op++ = 128-2+rc; |
---|
580 | *op++ = (tidataval_t)(tp[beg] >> shft & 0xff); |
---|
581 | occ -= 2; |
---|
582 | } else |
---|
583 | rc = 0; |
---|
584 | } |
---|
585 | tif->tif_rawcp = op; |
---|
586 | tif->tif_rawcc = tif->tif_rawdatasize - occ; |
---|
587 | |
---|
588 | return (0); |
---|
589 | } |
---|
590 | |
---|
591 | /* |
---|
592 | * Encode a strip of pixels. We break it into rows to |
---|
593 | * avoid encoding runs across row boundaries. |
---|
594 | */ |
---|
595 | static int |
---|
596 | LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
---|
597 | { |
---|
598 | tsize_t rowlen = TIFFScanlineSize(tif); |
---|
599 | |
---|
600 | assert(cc%rowlen == 0); |
---|
601 | while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0) |
---|
602 | bp += rowlen, cc -= rowlen; |
---|
603 | return (cc == 0); |
---|
604 | } |
---|
605 | |
---|
606 | /* |
---|
607 | * Encode a tile of pixels. We break it into rows to |
---|
608 | * avoid encoding runs across row boundaries. |
---|
609 | */ |
---|
610 | static int |
---|
611 | LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) |
---|
612 | { |
---|
613 | tsize_t rowlen = TIFFTileRowSize(tif); |
---|
614 | |
---|
615 | assert(cc%rowlen == 0); |
---|
616 | while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0) |
---|
617 | bp += rowlen, cc -= rowlen; |
---|
618 | return (cc == 0); |
---|
619 | } |
---|
620 | |
---|
621 | /* |
---|
622 | * Encode/Decode functions for converting to and from user formats. |
---|
623 | */ |
---|
624 | |
---|
625 | #include "uvcode.h" |
---|
626 | |
---|
627 | #ifndef UVSCALE |
---|
628 | #define U_NEU 0.210526316 |
---|
629 | #define V_NEU 0.473684211 |
---|
630 | #define UVSCALE 410. |
---|
631 | #endif |
---|
632 | |
---|
633 | #ifndef M_LN2 |
---|
634 | #define M_LN2 0.69314718055994530942 |
---|
635 | #endif |
---|
636 | #ifndef M_PI |
---|
637 | #define M_PI 3.14159265358979323846 |
---|
638 | #endif |
---|
639 | #define log2(x) ((1./M_LN2)*log(x)) |
---|
640 | #define exp2(x) exp(M_LN2*(x)) |
---|
641 | |
---|
642 | #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \ |
---|
643 | (int)(x) : \ |
---|
644 | (int)((x) + rand()*(1./RAND_MAX) - .5)) |
---|
645 | |
---|
646 | #if !LOGLUV_PUBLIC |
---|
647 | static |
---|
648 | #endif |
---|
649 | double |
---|
650 | LogL16toY(int p16) /* compute luminance from 16-bit LogL */ |
---|
651 | { |
---|
652 | int Le = p16 & 0x7fff; |
---|
653 | double Y; |
---|
654 | |
---|
655 | if (!Le) |
---|
656 | return (0.); |
---|
657 | Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); |
---|
658 | return (!(p16 & 0x8000) ? Y : -Y); |
---|
659 | } |
---|
660 | |
---|
661 | #if !LOGLUV_PUBLIC |
---|
662 | static |
---|
663 | #endif |
---|
664 | int |
---|
665 | LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ |
---|
666 | { |
---|
667 | if (Y >= 1.8371976e19) |
---|
668 | return (0x7fff); |
---|
669 | if (Y <= -1.8371976e19) |
---|
670 | return (0xffff); |
---|
671 | if (Y > 5.4136769e-20) |
---|
672 | return itrunc(256.*(log2(Y) + 64.), em); |
---|
673 | if (Y < -5.4136769e-20) |
---|
674 | return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); |
---|
675 | return (0); |
---|
676 | } |
---|
677 | |
---|
678 | static void |
---|
679 | L16toY(LogLuvState* sp, tidata_t op, int n) |
---|
680 | { |
---|
681 | int16* l16 = (int16*) sp->tbuf; |
---|
682 | float* yp = (float*) op; |
---|
683 | |
---|
684 | while (n-- > 0) |
---|
685 | *yp++ = (float)LogL16toY(*l16++); |
---|
686 | } |
---|
687 | |
---|
688 | static void |
---|
689 | L16toGry(LogLuvState* sp, tidata_t op, int n) |
---|
690 | { |
---|
691 | int16* l16 = (int16*) sp->tbuf; |
---|
692 | uint8* gp = (uint8*) op; |
---|
693 | |
---|
694 | while (n-- > 0) { |
---|
695 | double Y = LogL16toY(*l16++); |
---|
696 | *gp++ = (Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)); |
---|
697 | } |
---|
698 | } |
---|
699 | |
---|
700 | static void |
---|
701 | L16fromY(LogLuvState* sp, tidata_t op, int n) |
---|
702 | { |
---|
703 | int16* l16 = (int16*) sp->tbuf; |
---|
704 | float* yp = (float*) op; |
---|
705 | |
---|
706 | while (n-- > 0) |
---|
707 | *l16++ = LogL16fromY(*yp++, sp->encode_meth); |
---|
708 | } |
---|
709 | |
---|
710 | #if !LOGLUV_PUBLIC |
---|
711 | static |
---|
712 | #endif |
---|
713 | void |
---|
714 | XYZtoRGB24(float xyz[3], uint8 rgb[3]) |
---|
715 | { |
---|
716 | double r, g, b; |
---|
717 | /* assume CCIR-709 primaries */ |
---|
718 | r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; |
---|
719 | g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; |
---|
720 | b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; |
---|
721 | /* assume 2.0 gamma for speed */ |
---|
722 | /* could use integer sqrt approx., but this is probably faster */ |
---|
723 | rgb[0] = (r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)); |
---|
724 | rgb[1] = (g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)); |
---|
725 | rgb[2] = (b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)); |
---|
726 | } |
---|
727 | |
---|
728 | #if !LOGLUV_PUBLIC |
---|
729 | static |
---|
730 | #endif |
---|
731 | double |
---|
732 | LogL10toY(int p10) /* compute luminance from 10-bit LogL */ |
---|
733 | { |
---|
734 | if (p10 == 0) |
---|
735 | return (0.); |
---|
736 | return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); |
---|
737 | } |
---|
738 | |
---|
739 | #if !LOGLUV_PUBLIC |
---|
740 | static |
---|
741 | #endif |
---|
742 | int |
---|
743 | LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ |
---|
744 | { |
---|
745 | if (Y >= 15.742) |
---|
746 | return (0x3ff); |
---|
747 | else if (Y <= .00024283) |
---|
748 | return (0); |
---|
749 | else |
---|
750 | return itrunc(64.*(log2(Y) + 12.), em); |
---|
751 | } |
---|
752 | |
---|
753 | #define NANGLES 100 |
---|
754 | #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ |
---|
755 | * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) |
---|
756 | |
---|
757 | static int |
---|
758 | oog_encode(double u, double v) /* encode out-of-gamut chroma */ |
---|
759 | { |
---|
760 | static int oog_table[NANGLES]; |
---|
761 | static int initialized = 0; |
---|
762 | register int i; |
---|
763 | |
---|
764 | if (!initialized) { /* set up perimeter table */ |
---|
765 | double eps[NANGLES], ua, va, ang, epsa; |
---|
766 | int ui, vi, ustep; |
---|
767 | for (i = NANGLES; i--; ) |
---|
768 | eps[i] = 2.; |
---|
769 | for (vi = UV_NVS; vi--; ) { |
---|
770 | va = UV_VSTART + (vi+.5)*UV_SQSIZ; |
---|
771 | ustep = uv_row[vi].nus-1; |
---|
772 | if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) |
---|
773 | ustep = 1; |
---|
774 | for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { |
---|
775 | ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; |
---|
776 | ang = uv2ang(ua, va); |
---|
777 | i = (int) ang; |
---|
778 | epsa = fabs(ang - (i+.5)); |
---|
779 | if (epsa < eps[i]) { |
---|
780 | oog_table[i] = uv_row[vi].ncum + ui; |
---|
781 | eps[i] = epsa; |
---|
782 | } |
---|
783 | } |
---|
784 | } |
---|
785 | for (i = NANGLES; i--; ) /* fill any holes */ |
---|
786 | if (eps[i] > 1.5) { |
---|
787 | int i1, i2; |
---|
788 | for (i1 = 1; i1 < NANGLES/2; i1++) |
---|
789 | if (eps[(i+i1)%NANGLES] < 1.5) |
---|
790 | break; |
---|
791 | for (i2 = 1; i2 < NANGLES/2; i2++) |
---|
792 | if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) |
---|
793 | break; |
---|
794 | if (i1 < i2) |
---|
795 | oog_table[i] = |
---|
796 | oog_table[(i+i1)%NANGLES]; |
---|
797 | else |
---|
798 | oog_table[i] = |
---|
799 | oog_table[(i+NANGLES-i2)%NANGLES]; |
---|
800 | } |
---|
801 | initialized = 1; |
---|
802 | } |
---|
803 | i = (int) uv2ang(u, v); /* look up hue angle */ |
---|
804 | return (oog_table[i]); |
---|
805 | } |
---|
806 | |
---|
807 | #undef uv2ang |
---|
808 | #undef NANGLES |
---|
809 | |
---|
810 | #if !LOGLUV_PUBLIC |
---|
811 | static |
---|
812 | #endif |
---|
813 | int |
---|
814 | uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ |
---|
815 | { |
---|
816 | register int vi, ui; |
---|
817 | |
---|
818 | if (v < UV_VSTART) |
---|
819 | return oog_encode(u, v); |
---|
820 | vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); |
---|
821 | if (vi >= UV_NVS) |
---|
822 | return oog_encode(u, v); |
---|
823 | if (u < uv_row[vi].ustart) |
---|
824 | return oog_encode(u, v); |
---|
825 | ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); |
---|
826 | if (ui >= uv_row[vi].nus) |
---|
827 | return oog_encode(u, v); |
---|
828 | |
---|
829 | return (uv_row[vi].ncum + ui); |
---|
830 | } |
---|
831 | |
---|
832 | #if !LOGLUV_PUBLIC |
---|
833 | static |
---|
834 | #endif |
---|
835 | int |
---|
836 | uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ |
---|
837 | { |
---|
838 | int upper, lower; |
---|
839 | register int ui, vi; |
---|
840 | |
---|
841 | if (c < 0 || c >= UV_NDIVS) |
---|
842 | return (-1); |
---|
843 | lower = 0; /* binary search */ |
---|
844 | upper = UV_NVS; |
---|
845 | while (upper - lower > 1) { |
---|
846 | vi = (lower + upper) >> 1; |
---|
847 | ui = c - uv_row[vi].ncum; |
---|
848 | if (ui > 0) |
---|
849 | lower = vi; |
---|
850 | else if (ui < 0) |
---|
851 | upper = vi; |
---|
852 | else { |
---|
853 | lower = vi; |
---|
854 | break; |
---|
855 | } |
---|
856 | } |
---|
857 | vi = lower; |
---|
858 | ui = c - uv_row[vi].ncum; |
---|
859 | *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; |
---|
860 | *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; |
---|
861 | return (0); |
---|
862 | } |
---|
863 | |
---|
864 | #if !LOGLUV_PUBLIC |
---|
865 | static |
---|
866 | #endif |
---|
867 | void |
---|
868 | LogLuv24toXYZ(uint32 p, float XYZ[3]) |
---|
869 | { |
---|
870 | int Ce; |
---|
871 | double L, u, v, s, x, y; |
---|
872 | /* decode luminance */ |
---|
873 | L = LogL10toY(p>>14 & 0x3ff); |
---|
874 | if (L <= 0.) { |
---|
875 | XYZ[0] = XYZ[1] = XYZ[2] = 0.; |
---|
876 | return; |
---|
877 | } |
---|
878 | /* decode color */ |
---|
879 | Ce = p & 0x3fff; |
---|
880 | if (uv_decode(&u, &v, Ce) < 0) { |
---|
881 | u = U_NEU; v = V_NEU; |
---|
882 | } |
---|
883 | s = 1./(6.*u - 16.*v + 12.); |
---|
884 | x = 9.*u * s; |
---|
885 | y = 4.*v * s; |
---|
886 | /* convert to XYZ */ |
---|
887 | XYZ[0] = (float)(x/y * L); |
---|
888 | XYZ[1] = (float)L; |
---|
889 | XYZ[2] = (float)((1.-x-y)/y * L); |
---|
890 | } |
---|
891 | |
---|
892 | #if !LOGLUV_PUBLIC |
---|
893 | static |
---|
894 | #endif |
---|
895 | uint32 |
---|
896 | LogLuv24fromXYZ(float XYZ[3], int em) |
---|
897 | { |
---|
898 | int Le, Ce; |
---|
899 | double u, v, s; |
---|
900 | /* encode luminance */ |
---|
901 | Le = LogL10fromY(XYZ[1], em); |
---|
902 | /* encode color */ |
---|
903 | s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; |
---|
904 | if (!Le || s <= 0.) { |
---|
905 | u = U_NEU; |
---|
906 | v = V_NEU; |
---|
907 | } else { |
---|
908 | u = 4.*XYZ[0] / s; |
---|
909 | v = 9.*XYZ[1] / s; |
---|
910 | } |
---|
911 | Ce = uv_encode(u, v, em); |
---|
912 | if (Ce < 0) /* never happens */ |
---|
913 | Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
---|
914 | /* combine encodings */ |
---|
915 | return (Le << 14 | Ce); |
---|
916 | } |
---|
917 | |
---|
918 | static void |
---|
919 | Luv24toXYZ(LogLuvState* sp, tidata_t op, int n) |
---|
920 | { |
---|
921 | uint32* luv = (uint32*) sp->tbuf; |
---|
922 | float* xyz = (float*) op; |
---|
923 | |
---|
924 | while (n-- > 0) { |
---|
925 | LogLuv24toXYZ(*luv, xyz); |
---|
926 | xyz += 3; |
---|
927 | luv++; |
---|
928 | } |
---|
929 | } |
---|
930 | |
---|
931 | static void |
---|
932 | Luv24toLuv48(LogLuvState* sp, tidata_t op, int n) |
---|
933 | { |
---|
934 | uint32* luv = (uint32*) sp->tbuf; |
---|
935 | int16* luv3 = (int16*) op; |
---|
936 | |
---|
937 | while (n-- > 0) { |
---|
938 | double u, v; |
---|
939 | |
---|
940 | *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); |
---|
941 | if (uv_decode(&u, &v, *luv&0x3fff) < 0) { |
---|
942 | u = U_NEU; |
---|
943 | v = V_NEU; |
---|
944 | } |
---|
945 | *luv3++ = (int16)(u * (1L<<15)); |
---|
946 | *luv3++ = (int16)(v * (1L<<15)); |
---|
947 | luv++; |
---|
948 | } |
---|
949 | } |
---|
950 | |
---|
951 | static void |
---|
952 | Luv24toRGB(LogLuvState* sp, tidata_t op, int n) |
---|
953 | { |
---|
954 | uint32* luv = (uint32*) sp->tbuf; |
---|
955 | uint8* rgb = (uint8*) op; |
---|
956 | |
---|
957 | while (n-- > 0) { |
---|
958 | float xyz[3]; |
---|
959 | |
---|
960 | LogLuv24toXYZ(*luv++, xyz); |
---|
961 | XYZtoRGB24(xyz, rgb); |
---|
962 | rgb += 3; |
---|
963 | } |
---|
964 | } |
---|
965 | |
---|
966 | static void |
---|
967 | Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n) |
---|
968 | { |
---|
969 | uint32* luv = (uint32*) sp->tbuf; |
---|
970 | float* xyz = (float*) op; |
---|
971 | |
---|
972 | while (n-- > 0) { |
---|
973 | *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); |
---|
974 | xyz += 3; |
---|
975 | } |
---|
976 | } |
---|
977 | |
---|
978 | static void |
---|
979 | Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n) |
---|
980 | { |
---|
981 | uint32* luv = (uint32*) sp->tbuf; |
---|
982 | int16* luv3 = (int16*) op; |
---|
983 | |
---|
984 | while (n-- > 0) { |
---|
985 | int Le, Ce; |
---|
986 | |
---|
987 | if (luv3[0] <= 0) |
---|
988 | Le = 0; |
---|
989 | else if (luv3[0] >= (1<<12)+3314) |
---|
990 | Le = (1<<10) - 1; |
---|
991 | else if (sp->encode_meth == SGILOGENCODE_NODITHER) |
---|
992 | Le = (luv3[0]-3314) >> 2; |
---|
993 | else |
---|
994 | Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); |
---|
995 | |
---|
996 | Ce = uv_encode((luv[1]+.5)/(1<<15), (luv[2]+.5)/(1<<15), |
---|
997 | sp->encode_meth); |
---|
998 | if (Ce < 0) /* never happens */ |
---|
999 | Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); |
---|
1000 | *luv++ = (uint32)Le << 14 | Ce; |
---|
1001 | luv3 += 3; |
---|
1002 | } |
---|
1003 | } |
---|
1004 | |
---|
1005 | #if !LOGLUV_PUBLIC |
---|
1006 | static |
---|
1007 | #endif |
---|
1008 | void |
---|
1009 | LogLuv32toXYZ(uint32 p, float XYZ[3]) |
---|
1010 | { |
---|
1011 | double L, u, v, s, x, y; |
---|
1012 | /* decode luminance */ |
---|
1013 | L = LogL16toY((int)p >> 16); |
---|
1014 | if (L <= 0.) { |
---|
1015 | XYZ[0] = XYZ[1] = XYZ[2] = 0.; |
---|
1016 | return; |
---|
1017 | } |
---|
1018 | /* decode color */ |
---|
1019 | u = 1./UVSCALE * ((p>>8 & 0xff) + .5); |
---|
1020 | v = 1./UVSCALE * ((p & 0xff) + .5); |
---|
1021 | s = 1./(6.*u - 16.*v + 12.); |
---|
1022 | x = 9.*u * s; |
---|
1023 | y = 4.*v * s; |
---|
1024 | /* convert to XYZ */ |
---|
1025 | XYZ[0] = (float)(x/y * L); |
---|
1026 | XYZ[1] = (float)L; |
---|
1027 | XYZ[2] = (float)((1.-x-y)/y * L); |
---|
1028 | } |
---|
1029 | |
---|
1030 | #if !LOGLUV_PUBLIC |
---|
1031 | static |
---|
1032 | #endif |
---|
1033 | uint32 |
---|
1034 | LogLuv32fromXYZ(float XYZ[3], int em) |
---|
1035 | { |
---|
1036 | unsigned int Le, ue, ve; |
---|
1037 | double u, v, s; |
---|
1038 | /* encode luminance */ |
---|
1039 | Le = (unsigned int)LogL16fromY(XYZ[1], em); |
---|
1040 | /* encode color */ |
---|
1041 | s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; |
---|
1042 | if (!Le || s <= 0.) { |
---|
1043 | u = U_NEU; |
---|
1044 | v = V_NEU; |
---|
1045 | } else { |
---|
1046 | u = 4.*XYZ[0] / s; |
---|
1047 | v = 9.*XYZ[1] / s; |
---|
1048 | } |
---|
1049 | if (u <= 0.) ue = 0; |
---|
1050 | else ue = itrunc(UVSCALE*u, em); |
---|
1051 | if (ue > 255) ue = 255; |
---|
1052 | if (v <= 0.) ve = 0; |
---|
1053 | else ve = itrunc(UVSCALE*v, em); |
---|
1054 | if (ve > 255) ve = 255; |
---|
1055 | /* combine encodings */ |
---|
1056 | return (Le << 16 | ue << 8 | ve); |
---|
1057 | } |
---|
1058 | |
---|
1059 | static void |
---|
1060 | Luv32toXYZ(LogLuvState* sp, tidata_t op, int n) |
---|
1061 | { |
---|
1062 | uint32* luv = (uint32*) sp->tbuf; |
---|
1063 | float* xyz = (float*) op; |
---|
1064 | |
---|
1065 | while (n-- > 0) { |
---|
1066 | LogLuv32toXYZ(*luv++, xyz); |
---|
1067 | xyz += 3; |
---|
1068 | } |
---|
1069 | } |
---|
1070 | |
---|
1071 | static void |
---|
1072 | Luv32toLuv48(LogLuvState* sp, tidata_t op, int n) |
---|
1073 | { |
---|
1074 | uint32* luv = (uint32*) sp->tbuf; |
---|
1075 | int16* luv3 = (int16*) op; |
---|
1076 | |
---|
1077 | while (n-- > 0) { |
---|
1078 | double u, v; |
---|
1079 | |
---|
1080 | *luv3++ = (int16)(*luv >> 16); |
---|
1081 | u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); |
---|
1082 | v = 1./UVSCALE * ((*luv & 0xff) + .5); |
---|
1083 | *luv3++ = (int16)(u * (1L<<15)); |
---|
1084 | *luv3++ = (int16)(v * (1L<<15)); |
---|
1085 | luv++; |
---|
1086 | } |
---|
1087 | } |
---|
1088 | |
---|
1089 | static void |
---|
1090 | Luv32toRGB(LogLuvState* sp, tidata_t op, int n) |
---|
1091 | { |
---|
1092 | uint32* luv = (uint32*) sp->tbuf; |
---|
1093 | uint8* rgb = (uint8*) op; |
---|
1094 | |
---|
1095 | while (n-- > 0) { |
---|
1096 | float xyz[3]; |
---|
1097 | |
---|
1098 | LogLuv32toXYZ(*luv++, xyz); |
---|
1099 | XYZtoRGB24(xyz, rgb); |
---|
1100 | rgb += 3; |
---|
1101 | } |
---|
1102 | } |
---|
1103 | |
---|
1104 | static void |
---|
1105 | Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n) |
---|
1106 | { |
---|
1107 | uint32* luv = (uint32*) sp->tbuf; |
---|
1108 | float* xyz = (float*) op; |
---|
1109 | |
---|
1110 | while (n-- > 0) { |
---|
1111 | *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); |
---|
1112 | xyz += 3; |
---|
1113 | } |
---|
1114 | } |
---|
1115 | |
---|
1116 | static void |
---|
1117 | Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n) |
---|
1118 | { |
---|
1119 | uint32* luv = (uint32*) sp->tbuf; |
---|
1120 | int16* luv3 = (int16*) op; |
---|
1121 | |
---|
1122 | if (sp->encode_meth == SGILOGENCODE_NODITHER) { |
---|
1123 | while (n-- > 0) { |
---|
1124 | *luv++ = (uint32)luv3[0] << 16 | |
---|
1125 | (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | |
---|
1126 | (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); |
---|
1127 | luv3 += 3; |
---|
1128 | } |
---|
1129 | return; |
---|
1130 | } |
---|
1131 | while (n-- > 0) { |
---|
1132 | *luv++ = (uint32)luv3[0] << 16 | |
---|
1133 | (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | |
---|
1134 | (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); |
---|
1135 | luv3 += 3; |
---|
1136 | } |
---|
1137 | } |
---|
1138 | |
---|
1139 | static void |
---|
1140 | _logLuvNop(LogLuvState* sp, tidata_t op, int n) |
---|
1141 | { |
---|
1142 | (void) sp; (void) op; (void) n; |
---|
1143 | } |
---|
1144 | |
---|
1145 | static int |
---|
1146 | LogL16GuessDataFmt(TIFFDirectory *td) |
---|
1147 | { |
---|
1148 | #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) |
---|
1149 | switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { |
---|
1150 | case PACK(1, 32, SAMPLEFORMAT_IEEEFP): |
---|
1151 | return (SGILOGDATAFMT_FLOAT); |
---|
1152 | case PACK(1, 16, SAMPLEFORMAT_VOID): |
---|
1153 | case PACK(1, 16, SAMPLEFORMAT_INT): |
---|
1154 | case PACK(1, 16, SAMPLEFORMAT_UINT): |
---|
1155 | return (SGILOGDATAFMT_16BIT); |
---|
1156 | case PACK(1, 8, SAMPLEFORMAT_VOID): |
---|
1157 | case PACK(1, 8, SAMPLEFORMAT_UINT): |
---|
1158 | return (SGILOGDATAFMT_8BIT); |
---|
1159 | } |
---|
1160 | #undef PACK |
---|
1161 | return (SGILOGDATAFMT_UNKNOWN); |
---|
1162 | } |
---|
1163 | |
---|
1164 | static int |
---|
1165 | LogL16InitState(TIFF* tif) |
---|
1166 | { |
---|
1167 | TIFFDirectory *td = &tif->tif_dir; |
---|
1168 | LogLuvState* sp = DecoderState(tif); |
---|
1169 | static const char module[] = "LogL16InitState"; |
---|
1170 | |
---|
1171 | assert(sp != NULL); |
---|
1172 | assert(td->td_photometric == PHOTOMETRIC_LOGL); |
---|
1173 | |
---|
1174 | /* for some reason, we can't do this in TIFFInitLogL16 */ |
---|
1175 | if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) |
---|
1176 | sp->user_datafmt = LogL16GuessDataFmt(td); |
---|
1177 | switch (sp->user_datafmt) { |
---|
1178 | case SGILOGDATAFMT_FLOAT: |
---|
1179 | sp->pixel_size = sizeof (float); |
---|
1180 | break; |
---|
1181 | case SGILOGDATAFMT_16BIT: |
---|
1182 | sp->pixel_size = sizeof (int16); |
---|
1183 | break; |
---|
1184 | case SGILOGDATAFMT_8BIT: |
---|
1185 | sp->pixel_size = sizeof (uint8); |
---|
1186 | break; |
---|
1187 | default: |
---|
1188 | TIFFError(tif->tif_name, |
---|
1189 | "No support for converting user data format to LogL"); |
---|
1190 | return (0); |
---|
1191 | } |
---|
1192 | sp->tbuflen = td->td_imagewidth * td->td_rowsperstrip; |
---|
1193 | sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (int16)); |
---|
1194 | if (sp->tbuf == NULL) { |
---|
1195 | TIFFError(module, "%s: No space for SGILog translation buffer", |
---|
1196 | tif->tif_name); |
---|
1197 | return (0); |
---|
1198 | } |
---|
1199 | return (1); |
---|
1200 | } |
---|
1201 | |
---|
1202 | static int |
---|
1203 | LogLuvGuessDataFmt(TIFFDirectory *td) |
---|
1204 | { |
---|
1205 | int guess; |
---|
1206 | |
---|
1207 | /* |
---|
1208 | * If the user didn't tell us their datafmt, |
---|
1209 | * take our best guess from the bitspersample. |
---|
1210 | */ |
---|
1211 | #define PACK(a,b) (((a)<<3)|(b)) |
---|
1212 | switch (PACK(td->td_bitspersample, td->td_sampleformat)) { |
---|
1213 | case PACK(32, SAMPLEFORMAT_IEEEFP): |
---|
1214 | guess = SGILOGDATAFMT_FLOAT; |
---|
1215 | break; |
---|
1216 | case PACK(32, SAMPLEFORMAT_VOID): |
---|
1217 | case PACK(32, SAMPLEFORMAT_UINT): |
---|
1218 | case PACK(32, SAMPLEFORMAT_INT): |
---|
1219 | guess = SGILOGDATAFMT_RAW; |
---|
1220 | break; |
---|
1221 | case PACK(16, SAMPLEFORMAT_VOID): |
---|
1222 | case PACK(16, SAMPLEFORMAT_INT): |
---|
1223 | case PACK(16, SAMPLEFORMAT_UINT): |
---|
1224 | guess = SGILOGDATAFMT_16BIT; |
---|
1225 | break; |
---|
1226 | case PACK( 8, SAMPLEFORMAT_VOID): |
---|
1227 | case PACK( 8, SAMPLEFORMAT_UINT): |
---|
1228 | guess = SGILOGDATAFMT_8BIT; |
---|
1229 | break; |
---|
1230 | default: |
---|
1231 | guess = SGILOGDATAFMT_UNKNOWN; |
---|
1232 | break; |
---|
1233 | #undef PACK |
---|
1234 | } |
---|
1235 | /* |
---|
1236 | * Double-check samples per pixel. |
---|
1237 | */ |
---|
1238 | switch (td->td_samplesperpixel) { |
---|
1239 | case 1: |
---|
1240 | if (guess != SGILOGDATAFMT_RAW) |
---|
1241 | guess = SGILOGDATAFMT_UNKNOWN; |
---|
1242 | break; |
---|
1243 | case 3: |
---|
1244 | if (guess == SGILOGDATAFMT_RAW) |
---|
1245 | guess = SGILOGDATAFMT_UNKNOWN; |
---|
1246 | break; |
---|
1247 | default: |
---|
1248 | guess = SGILOGDATAFMT_UNKNOWN; |
---|
1249 | break; |
---|
1250 | } |
---|
1251 | return (guess); |
---|
1252 | } |
---|
1253 | |
---|
1254 | static int |
---|
1255 | LogLuvInitState(TIFF* tif) |
---|
1256 | { |
---|
1257 | TIFFDirectory* td = &tif->tif_dir; |
---|
1258 | LogLuvState* sp = DecoderState(tif); |
---|
1259 | static const char module[] = "LogLuvInitState"; |
---|
1260 | |
---|
1261 | assert(sp != NULL); |
---|
1262 | assert(td->td_photometric == PHOTOMETRIC_LOGLUV); |
---|
1263 | |
---|
1264 | /* for some reason, we can't do this in TIFFInitLogLuv */ |
---|
1265 | if (td->td_planarconfig != PLANARCONFIG_CONTIG) { |
---|
1266 | TIFFError(module, |
---|
1267 | "SGILog compression cannot handle non-contiguous data"); |
---|
1268 | return (0); |
---|
1269 | } |
---|
1270 | if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) |
---|
1271 | sp->user_datafmt = LogLuvGuessDataFmt(td); |
---|
1272 | switch (sp->user_datafmt) { |
---|
1273 | case SGILOGDATAFMT_FLOAT: |
---|
1274 | sp->pixel_size = 3*sizeof (float); |
---|
1275 | break; |
---|
1276 | case SGILOGDATAFMT_16BIT: |
---|
1277 | sp->pixel_size = 3*sizeof (int16); |
---|
1278 | break; |
---|
1279 | case SGILOGDATAFMT_RAW: |
---|
1280 | sp->pixel_size = sizeof (uint32); |
---|
1281 | break; |
---|
1282 | case SGILOGDATAFMT_8BIT: |
---|
1283 | sp->pixel_size = 3*sizeof (uint8); |
---|
1284 | break; |
---|
1285 | default: |
---|
1286 | TIFFError(tif->tif_name, |
---|
1287 | "No support for converting user data format to LogLuv"); |
---|
1288 | return (0); |
---|
1289 | } |
---|
1290 | sp->tbuflen = td->td_imagewidth * td->td_rowsperstrip; |
---|
1291 | sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (uint32)); |
---|
1292 | if (sp->tbuf == NULL) { |
---|
1293 | TIFFError(module, "%s: No space for SGILog translation buffer", |
---|
1294 | tif->tif_name); |
---|
1295 | return (0); |
---|
1296 | } |
---|
1297 | return (1); |
---|
1298 | } |
---|
1299 | |
---|
1300 | static int |
---|
1301 | LogLuvSetupDecode(TIFF* tif) |
---|
1302 | { |
---|
1303 | LogLuvState* sp = DecoderState(tif); |
---|
1304 | TIFFDirectory* td = &tif->tif_dir; |
---|
1305 | |
---|
1306 | tif->tif_postdecode = _TIFFNoPostDecode; |
---|
1307 | switch (td->td_photometric) { |
---|
1308 | case PHOTOMETRIC_LOGLUV: |
---|
1309 | if (!LogLuvInitState(tif)) |
---|
1310 | break; |
---|
1311 | if (td->td_compression == COMPRESSION_SGILOG24) { |
---|
1312 | tif->tif_decoderow = LogLuvDecode24; |
---|
1313 | switch (sp->user_datafmt) { |
---|
1314 | case SGILOGDATAFMT_FLOAT: |
---|
1315 | sp->tfunc = Luv24toXYZ; |
---|
1316 | break; |
---|
1317 | case SGILOGDATAFMT_16BIT: |
---|
1318 | sp->tfunc = Luv24toLuv48; |
---|
1319 | break; |
---|
1320 | case SGILOGDATAFMT_8BIT: |
---|
1321 | sp->tfunc = Luv24toRGB; |
---|
1322 | break; |
---|
1323 | } |
---|
1324 | } else { |
---|
1325 | tif->tif_decoderow = LogLuvDecode32; |
---|
1326 | switch (sp->user_datafmt) { |
---|
1327 | case SGILOGDATAFMT_FLOAT: |
---|
1328 | sp->tfunc = Luv32toXYZ; |
---|
1329 | break; |
---|
1330 | case SGILOGDATAFMT_16BIT: |
---|
1331 | sp->tfunc = Luv32toLuv48; |
---|
1332 | break; |
---|
1333 | case SGILOGDATAFMT_8BIT: |
---|
1334 | sp->tfunc = Luv32toRGB; |
---|
1335 | break; |
---|
1336 | } |
---|
1337 | } |
---|
1338 | return (1); |
---|
1339 | case PHOTOMETRIC_LOGL: |
---|
1340 | if (!LogL16InitState(tif)) |
---|
1341 | break; |
---|
1342 | tif->tif_decoderow = LogL16Decode; |
---|
1343 | switch (sp->user_datafmt) { |
---|
1344 | case SGILOGDATAFMT_FLOAT: |
---|
1345 | sp->tfunc = L16toY; |
---|
1346 | break; |
---|
1347 | case SGILOGDATAFMT_8BIT: |
---|
1348 | sp->tfunc = L16toGry; |
---|
1349 | break; |
---|
1350 | } |
---|
1351 | return (1); |
---|
1352 | default: |
---|
1353 | TIFFError(tif->tif_name, |
---|
1354 | "Inappropriate photometric interpretation %d for SGILog compression; %s", |
---|
1355 | td->td_photometric, "must be either LogLUV or LogL"); |
---|
1356 | break; |
---|
1357 | } |
---|
1358 | return (0); |
---|
1359 | } |
---|
1360 | |
---|
1361 | static int |
---|
1362 | LogLuvSetupEncode(TIFF* tif) |
---|
1363 | { |
---|
1364 | LogLuvState* sp = EncoderState(tif); |
---|
1365 | TIFFDirectory* td = &tif->tif_dir; |
---|
1366 | |
---|
1367 | switch (td->td_photometric) { |
---|
1368 | case PHOTOMETRIC_LOGLUV: |
---|
1369 | if (!LogLuvInitState(tif)) |
---|
1370 | break; |
---|
1371 | if (td->td_compression == COMPRESSION_SGILOG24) { |
---|
1372 | tif->tif_encoderow = LogLuvEncode24; |
---|
1373 | switch (sp->user_datafmt) { |
---|
1374 | case SGILOGDATAFMT_FLOAT: |
---|
1375 | sp->tfunc = Luv24fromXYZ; |
---|
1376 | break; |
---|
1377 | case SGILOGDATAFMT_16BIT: |
---|
1378 | sp->tfunc = Luv24fromLuv48; |
---|
1379 | break; |
---|
1380 | case SGILOGDATAFMT_RAW: |
---|
1381 | break; |
---|
1382 | default: |
---|
1383 | goto notsupported; |
---|
1384 | } |
---|
1385 | } else { |
---|
1386 | tif->tif_encoderow = LogLuvEncode32; |
---|
1387 | switch (sp->user_datafmt) { |
---|
1388 | case SGILOGDATAFMT_FLOAT: |
---|
1389 | sp->tfunc = Luv32fromXYZ; |
---|
1390 | break; |
---|
1391 | case SGILOGDATAFMT_16BIT: |
---|
1392 | sp->tfunc = Luv32fromLuv48; |
---|
1393 | break; |
---|
1394 | case SGILOGDATAFMT_RAW: |
---|
1395 | break; |
---|
1396 | default: |
---|
1397 | goto notsupported; |
---|
1398 | } |
---|
1399 | } |
---|
1400 | break; |
---|
1401 | case PHOTOMETRIC_LOGL: |
---|
1402 | if (!LogL16InitState(tif)) |
---|
1403 | break; |
---|
1404 | tif->tif_encoderow = LogL16Encode; |
---|
1405 | switch (sp->user_datafmt) { |
---|
1406 | case SGILOGDATAFMT_FLOAT: |
---|
1407 | sp->tfunc = L16fromY; |
---|
1408 | break; |
---|
1409 | case SGILOGDATAFMT_16BIT: |
---|
1410 | break; |
---|
1411 | default: |
---|
1412 | goto notsupported; |
---|
1413 | } |
---|
1414 | break; |
---|
1415 | default: |
---|
1416 | TIFFError(tif->tif_name, |
---|
1417 | "Inappropriate photometric interpretation %d for SGILog compression; %s", |
---|
1418 | td->td_photometric, "must be either LogLUV or LogL"); |
---|
1419 | break; |
---|
1420 | } |
---|
1421 | return (1); |
---|
1422 | notsupported: |
---|
1423 | TIFFError(tif->tif_name, |
---|
1424 | "SGILog compression supported only for %s, or raw data", |
---|
1425 | td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); |
---|
1426 | return (0); |
---|
1427 | } |
---|
1428 | |
---|
1429 | static void |
---|
1430 | LogLuvClose(TIFF* tif) |
---|
1431 | { |
---|
1432 | TIFFDirectory *td = &tif->tif_dir; |
---|
1433 | |
---|
1434 | /* |
---|
1435 | * For consistency, we always want to write out the same |
---|
1436 | * bitspersample and sampleformat for our TIFF file, |
---|
1437 | * regardless of the data format being used by the application. |
---|
1438 | * Since this routine is called after tags have been set but |
---|
1439 | * before they have been recorded in the file, we reset them here. |
---|
1440 | */ |
---|
1441 | td->td_samplesperpixel = |
---|
1442 | (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; |
---|
1443 | td->td_bitspersample = 16; |
---|
1444 | td->td_sampleformat = SAMPLEFORMAT_INT; |
---|
1445 | } |
---|
1446 | |
---|
1447 | static void |
---|
1448 | LogLuvCleanup(TIFF* tif) |
---|
1449 | { |
---|
1450 | LogLuvState* sp = (LogLuvState *)tif->tif_data; |
---|
1451 | |
---|
1452 | if (sp) { |
---|
1453 | if (sp->tbuf) |
---|
1454 | _TIFFfree(sp->tbuf); |
---|
1455 | _TIFFfree(sp); |
---|
1456 | tif->tif_data = NULL; |
---|
1457 | } |
---|
1458 | } |
---|
1459 | |
---|
1460 | static int |
---|
1461 | LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap) |
---|
1462 | { |
---|
1463 | LogLuvState* sp = DecoderState(tif); |
---|
1464 | int bps, fmt; |
---|
1465 | |
---|
1466 | switch (tag) { |
---|
1467 | case TIFFTAG_SGILOGDATAFMT: |
---|
1468 | sp->user_datafmt = va_arg(ap, int); |
---|
1469 | /* |
---|
1470 | * Tweak the TIFF header so that the rest of libtiff knows what |
---|
1471 | * size of data will be passed between app and library, and |
---|
1472 | * assume that the app knows what it is doing and is not |
---|
1473 | * confused by these header manipulations... |
---|
1474 | */ |
---|
1475 | switch (sp->user_datafmt) { |
---|
1476 | case SGILOGDATAFMT_FLOAT: |
---|
1477 | bps = 32, fmt = SAMPLEFORMAT_IEEEFP; |
---|
1478 | break; |
---|
1479 | case SGILOGDATAFMT_16BIT: |
---|
1480 | bps = 16, fmt = SAMPLEFORMAT_INT; |
---|
1481 | break; |
---|
1482 | case SGILOGDATAFMT_RAW: |
---|
1483 | bps = 32, fmt = SAMPLEFORMAT_UINT; |
---|
1484 | TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); |
---|
1485 | break; |
---|
1486 | case SGILOGDATAFMT_8BIT: |
---|
1487 | bps = 8, fmt = SAMPLEFORMAT_UINT; |
---|
1488 | break; |
---|
1489 | default: |
---|
1490 | TIFFError(tif->tif_name, |
---|
1491 | "Unknown data format %d for LogLuv compression", |
---|
1492 | sp->user_datafmt); |
---|
1493 | return (0); |
---|
1494 | } |
---|
1495 | TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); |
---|
1496 | TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); |
---|
1497 | /* |
---|
1498 | * Must recalculate sizes should bits/sample change. |
---|
1499 | */ |
---|
1500 | tif->tif_tilesize = TIFFTileSize(tif); |
---|
1501 | tif->tif_scanlinesize = TIFFScanlineSize(tif); |
---|
1502 | return (1); |
---|
1503 | case TIFFTAG_SGILOGENCODE: |
---|
1504 | sp->encode_meth = va_arg(ap, int); |
---|
1505 | if (sp->encode_meth != SGILOGENCODE_NODITHER && |
---|
1506 | sp->encode_meth != SGILOGENCODE_RANDITHER) { |
---|
1507 | TIFFError(tif->tif_name, |
---|
1508 | "Unknown encoding %d for LogLuv compression", |
---|
1509 | sp->encode_meth); |
---|
1510 | return (0); |
---|
1511 | } |
---|
1512 | return (1); |
---|
1513 | default: |
---|
1514 | return (*sp->vsetparent)(tif, tag, ap); |
---|
1515 | } |
---|
1516 | } |
---|
1517 | |
---|
1518 | static int |
---|
1519 | LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap) |
---|
1520 | { |
---|
1521 | LogLuvState *sp = (LogLuvState *)tif->tif_data; |
---|
1522 | |
---|
1523 | switch (tag) { |
---|
1524 | case TIFFTAG_SGILOGDATAFMT: |
---|
1525 | *va_arg(ap, int*) = sp->user_datafmt; |
---|
1526 | return (1); |
---|
1527 | default: |
---|
1528 | return (*sp->vgetparent)(tif, tag, ap); |
---|
1529 | } |
---|
1530 | } |
---|
1531 | |
---|
1532 | static const TIFFFieldInfo LogLuvFieldInfo[] = { |
---|
1533 | { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, FIELD_PSEUDO, |
---|
1534 | TRUE, FALSE, "SGILogDataFmt"}, |
---|
1535 | { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, FIELD_PSEUDO, |
---|
1536 | TRUE, FALSE, "SGILogEncode"} |
---|
1537 | }; |
---|
1538 | |
---|
1539 | int |
---|
1540 | TIFFInitSGILog(TIFF* tif, int scheme) |
---|
1541 | { |
---|
1542 | static const char module[] = "TIFFInitSGILog"; |
---|
1543 | LogLuvState* sp; |
---|
1544 | |
---|
1545 | assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); |
---|
1546 | |
---|
1547 | /* |
---|
1548 | * Allocate state block so tag methods have storage to record values. |
---|
1549 | */ |
---|
1550 | tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState)); |
---|
1551 | if (tif->tif_data == NULL) |
---|
1552 | goto bad; |
---|
1553 | sp = (LogLuvState*) tif->tif_data; |
---|
1554 | _TIFFmemset((tdata_t)sp, 0, sizeof (*sp)); |
---|
1555 | sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; |
---|
1556 | sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? |
---|
1557 | SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; |
---|
1558 | sp->tfunc = _logLuvNop; |
---|
1559 | |
---|
1560 | /* |
---|
1561 | * Install codec methods. |
---|
1562 | * NB: tif_decoderow & tif_encoderow are filled |
---|
1563 | * in at setup time. |
---|
1564 | */ |
---|
1565 | tif->tif_setupdecode = LogLuvSetupDecode; |
---|
1566 | tif->tif_decodestrip = LogLuvDecodeStrip; |
---|
1567 | tif->tif_decodetile = LogLuvDecodeTile; |
---|
1568 | tif->tif_setupencode = LogLuvSetupEncode; |
---|
1569 | tif->tif_encodestrip = LogLuvEncodeStrip; |
---|
1570 | tif->tif_encodetile = LogLuvEncodeTile; |
---|
1571 | tif->tif_close = LogLuvClose; |
---|
1572 | tif->tif_cleanup = LogLuvCleanup; |
---|
1573 | |
---|
1574 | /* override SetField so we can handle our private pseudo-tag */ |
---|
1575 | _TIFFMergeFieldInfo(tif, LogLuvFieldInfo, N(LogLuvFieldInfo)); |
---|
1576 | sp->vgetparent = tif->tif_vgetfield; |
---|
1577 | tif->tif_vgetfield = LogLuvVGetField; /* hook for codec tags */ |
---|
1578 | sp->vsetparent = tif->tif_vsetfield; |
---|
1579 | tif->tif_vsetfield = LogLuvVSetField; /* hook for codec tags */ |
---|
1580 | |
---|
1581 | return (1); |
---|
1582 | bad: |
---|
1583 | TIFFError(module, "%s: No space for LogLuv state block", tif->tif_name); |
---|
1584 | return (0); |
---|
1585 | } |
---|
1586 | #endif /* LOGLUV_SUPPORT */ |
---|