Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/arrayaccess.c @ 45:b74429b0f5c4 v1.26.5+1

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+++++ v1.26.5+1
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:13 +0200
parents b50eed0cc0ef
children
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2
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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26
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27 /*!
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28 * \file arrayaccess.c
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29 * <pre>
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30 *
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31 * Access within an array of 32-bit words
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32 *
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33 * l_int32 l_getDataBit()
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34 * void l_setDataBit()
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35 * void l_clearDataBit()
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36 * void l_setDataBitVal()
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37 * l_int32 l_getDataDibit()
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38 * void l_setDataDibit()
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39 * void l_clearDataDibit()
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40 * l_int32 l_getDataQbit()
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41 * void l_setDataQbit()
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42 * void l_clearDataQbit()
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43 * l_int32 l_getDataByte()
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44 * void l_setDataByte()
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45 * l_int32 l_getDataTwoBytes()
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46 * void l_setDataTwoBytes()
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47 * l_int32 l_getDataFourBytes()
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48 * void l_setDataFourBytes()
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49 *
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50 * Note that these all require 32-bit alignment, and hence an input
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51 * ptr to l_uint32. However, this is not enforced by the compiler.
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52 * Instead, we allow the use of a void* ptr, because the line ptrs
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53 * are an efficient way to get random access (see pixGetLinePtrs()).
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54 * It is then necessary to cast internally within each function
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55 * because ptr arithmetic requires knowing the size of the units
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56 * being referenced.
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57 * </pre>
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58 */
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59
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60 #ifdef HAVE_CONFIG_H
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61 #include <config_auto.h>
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62 #endif /* HAVE_CONFIG_H */
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64 #include "allheaders.h"
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65
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66 /*----------------------------------------------------------------------*
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67 * Access within an array of 32-bit words *
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68 *----------------------------------------------------------------------*/
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69 /*!
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70 * \brief l_getDataBit()
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71 *
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72 * \param[in] line ptr to beginning of data line
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73 * \param[in] n pixel index
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74 * \return val of the nth 1-bit pixel.
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75 */
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76 l_int32
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77 l_getDataBit(const void *line,
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78 l_int32 n)
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79 {
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80 return (*((const l_uint32 *)line + (n >> 5)) >> (31 - (n & 31))) & 1;
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81 }
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82
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83
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84 /*!
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85 * \brief l_setDataBit()
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86 *
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87 * \param[in] line ptr to beginning of data line
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88 * \param[in] n pixel index
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89 * \return void
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90 *
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91 * Action: sets the pixel to 1
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92 */
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93 void
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94 l_setDataBit(void *line,
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95 l_int32 n)
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96 {
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97 *((l_uint32 *)line + (n >> 5)) |= (0x80000000 >> (n & 31));
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98 }
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99
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100
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101 /*!
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102 * \brief l_clearDataBit()
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103 *
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104 * \param[in] line ptr to beginning of data line
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105 * \param[in] n pixel index
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106 * \return void
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107 *
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108 * Action: sets the 1-bit pixel to 0
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109 */
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110 void
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111 l_clearDataBit(void *line,
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112 l_int32 n)
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113 {
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114 *((l_uint32 *)line + (n >> 5)) &= ~(0x80000000 >> (n & 31));
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115 }
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116
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117
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118 /*!
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119 * \brief l_setDataBitVal()
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120 *
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121 * \param[in] line ptr to beginning of data line
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122 * \param[in] n pixel index
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123 * \param[in] val val to be inserted: 0 or 1
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124 * \return void
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125 *
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126 * <pre>
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127 * Notes:
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128 * (1) This is an accessor for a 1 bpp pix.
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129 * (2) It is actually a little slower than using:
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130 * if (val == 0)
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131 * l_ClearDataBit(line, n);
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132 * else
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133 * l_SetDataBit(line, n);
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134 * </pre>
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135 */
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136 void
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137 l_setDataBitVal(void *line,
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138 l_int32 n,
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139 l_int32 val)
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140 {
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141 l_uint32 *pword;
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142
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143 pword = (l_uint32 *)line + (n >> 5);
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144 *pword &= ~(0x80000000 >> (n & 31)); /* clear */
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145 *pword |= (l_uint32)val << (31 - (n & 31)); /* set */
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146 }
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147
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148
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149 /*!
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150 * \brief l_getDataDibit()
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151 *
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152 * \param[in] line ptr to beginning of data line
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153 * \param[in] n pixel index
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154 * \return val of the nth 2-bit pixel.
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155 */
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156 l_int32
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157 l_getDataDibit(const void *line,
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158 l_int32 n)
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159 {
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160 return (*((const l_uint32 *)line + (n >> 4)) >> (2 * (15 - (n & 15)))) & 3;
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161 }
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162
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163
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164 /*!
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165 * \brief l_setDataDibit()
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166 *
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167 * \param[in] line ptr to beginning of data line
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168 * \param[in] n pixel index
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169 * \param[in] val val to be inserted: 0 - 3
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170 * \return void
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171 */
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172 void
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173 l_setDataDibit(void *line,
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174 l_int32 n,
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175 l_int32 val)
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176 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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177 l_uint32 *pword;
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178
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179 pword = (l_uint32 *)line + (n >> 4);
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180 *pword &= ~(0xc0000000 >> (2 * (n & 15))); /* clear */
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181 *pword |= (l_uint32)(val & 3) << (30 - 2 * (n & 15)); /* set */
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182 }
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183
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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184
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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185 /*!
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186 * \brief l_clearDataDibit()
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187 *
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188 * \param[in] line ptr to beginning of data line
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189 * \param[in] n pixel index
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190 * \return void
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191 *
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192 * Action: sets the 2-bit pixel to 0
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193 */
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diff changeset
194 void
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diff changeset
195 l_clearDataDibit(void *line,
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196 l_int32 n)
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diff changeset
197 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
198 *((l_uint32 *)line + (n >> 4)) &= ~(0xc0000000 >> (2 * (n & 15)));
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199 }
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diff changeset
200
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
201
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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202 /*!
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203 * \brief l_getDataQbit()
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204 *
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205 * \param[in] line ptr to beginning of data line
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206 * \param[in] n pixel index
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207 * \return val of the nth 4-bit pixel.
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208 */
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diff changeset
209 l_int32
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diff changeset
210 l_getDataQbit(const void *line,
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parents:
diff changeset
211 l_int32 n)
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parents:
diff changeset
212 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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213 return (*((const l_uint32 *)line + (n >> 3)) >> (4 * (7 - (n & 7)))) & 0xf;
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214 }
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215
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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216
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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217 /*!
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218 * \brief l_setDataQbit()
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219 *
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220 * \param[in] line ptr to beginning of data line
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221 * \param[in] n pixel index
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222 * \param[in] val val to be inserted: 0 - 0xf
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223 * \return void
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224 */
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Franz Glasner <fzglas.hg@dom66.de>
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225 void
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226 l_setDataQbit(void *line,
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227 l_int32 n,
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228 l_int32 val)
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229 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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230 l_uint32 *pword;
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231
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232 pword = (l_uint32 *)line + (n >> 3);
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233 *pword &= ~(0xf0000000 >> (4 * (n & 7))); /* clear */
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234 *pword |= (l_uint32)(val & 15) << (28 - 4 * (n & 7)); /* set */
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235 }
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236
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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237
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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238 /*!
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239 * \brief l_clearDataQbit()
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240 *
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241 * \param[in] line ptr to beginning of data line
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242 * \param[in] n pixel index
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243 * \return void
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244 *
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245 * Action: sets the 4-bit pixel to 0
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246 */
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
247 void
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
248 l_clearDataQbit(void *line,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
249 l_int32 n)
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Franz Glasner <fzglas.hg@dom66.de>
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250 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
251 *((l_uint32 *)line + (n >> 3)) &= ~(0xf0000000 >> (4 * (n & 7)));
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252 }
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253
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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254
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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255 /*!
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256 * \brief l_getDataByte()
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257 *
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258 * \param[in] line ptr to beginning of data line
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259 * \param[in] n pixel index
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260 * \return value of the n-th byte pixel
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261 */
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262 l_int32
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diff changeset
263 l_getDataByte(const void *line,
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264 l_int32 n)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
265 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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266 #ifdef L_BIG_ENDIAN
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267 return *((const l_uint8 *)line + n);
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268 #else /* L_LITTLE_ENDIAN */
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269 return *(l_uint8 *)((l_uintptr_t)((const l_uint8 *)line + n) ^ 3);
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diff changeset
270 #endif /* L_BIG_ENDIAN */
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diff changeset
271 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
272
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
273
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
274 /*!
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diff changeset
275 * \brief l_setDataByte()
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276 *
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277 * \param[in] line ptr to beginning of data line
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diff changeset
278 * \param[in] n pixel index
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diff changeset
279 * \param[in] val val to be inserted: 0 - 0xff
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280 * \return void
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diff changeset
281 */
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parents:
diff changeset
282 void
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parents:
diff changeset
283 l_setDataByte(void *line,
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parents:
diff changeset
284 l_int32 n,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
285 l_int32 val)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
286 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
287 #ifdef L_BIG_ENDIAN
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diff changeset
288 *((l_uint8 *)line + n) = val;
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diff changeset
289 #else /* L_LITTLE_ENDIAN */
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diff changeset
290 *(l_uint8 *)((l_uintptr_t)((l_uint8 *)line + n) ^ 3) = val;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
291 #endif /* L_BIG_ENDIAN */
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diff changeset
292 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
293
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
294
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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diff changeset
295 /*!
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diff changeset
296 * \brief l_getDataTwoBytes()
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parents:
diff changeset
297 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
298 * \param[in] line ptr to beginning of data line
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parents:
diff changeset
299 * \param[in] n pixel index
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
300 * \return value of the n-th 2-byte pixel
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
301 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
302 l_int32
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
303 l_getDataTwoBytes(const void *line,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
304 l_int32 n)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
305 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
306 #ifdef L_BIG_ENDIAN
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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307 return *((const l_uint16 *)line + n);
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308 #else /* L_LITTLE_ENDIAN */
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309 return *(l_uint16 *)((l_uintptr_t)((const l_uint16 *)line + n) ^ 2);
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310 #endif /* L_BIG_ENDIAN */
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311 }
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312
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313
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314 /*!
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315 * \brief l_setDataTwoBytes()
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316 *
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317 * \param[in] line ptr to beginning of data line
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318 * \param[in] n pixel index
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319 * \param[in] val val to be inserted: 0 - 0xffff
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320 * \return void
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321 */
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322 void
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323 l_setDataTwoBytes(void *line,
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324 l_int32 n,
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325 l_int32 val)
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326 {
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327 #ifdef L_BIG_ENDIAN
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328 *((l_uint16 *)line + n) = val;
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329 #else /* L_LITTLE_ENDIAN */
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330 *(l_uint16 *)((l_uintptr_t)((l_uint16 *)line + n) ^ 2) = val;
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331 #endif /* L_BIG_ENDIAN */
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332 }
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333
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334
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335 /*!
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336 * \brief l_getDataFourBytes()
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337 *
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338 * \param[in] line ptr to beginning of data line
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339 * \param[in] n pixel index
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340 * \return value of the n-th 4-byte pixel
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341 */
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342 l_int32
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343 l_getDataFourBytes(const void *line,
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344 l_int32 n)
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345 {
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346 return *((const l_uint32 *)line + n);
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347 }
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348
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349
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350 /*!
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351 * \brief l_setDataFourBytes()
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352 *
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353 * \param[in] line ptr to beginning of data line
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354 * \param[in] n pixel index
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355 * \param[in] val val to be inserted: 0 - 0xffffffff
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356 * \return void
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357 */
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358 void
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359 l_setDataFourBytes(void *line,
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360 l_int32 n,
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361 l_int32 val)
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362 {
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363 *((l_uint32 *)line + n) = val;
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364 }