Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/arrayaccess.h @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #ifndef LEPTONICA_ARRAY_ACCESS_H
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28 #define LEPTONICA_ARRAY_ACCESS_H
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29
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30 /*!
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31 * \file arrayaccess.h
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32 *
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33 * <pre>
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34 * 1, 2, 4, 8, 16 and 32 bit data access within an array of 32-bit words
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35 *
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36 * This is used primarily to access 1, 2, 4, 8, 16 and 32 bit pixels
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37 * in a line of image data, represented as an array of 32-bit words.
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38 *
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39 * pdata: pointer to first 32-bit word in the array
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40 * n: index of the pixel in the array
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41 *
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42 * Function calls for these accessors are defined in arrayaccess.c.
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43 *
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44 * However, for efficiency we use the inline macros for all accesses.
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45 * Even though the 2 and 4 bit set* accessors are more complicated,
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46 * they are about 10% faster than the function calls.
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47 *
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48 * The 32 bit access is just a cast and ptr arithmetic. We include
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49 * it so that the input ptr can be void*.
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50 *
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51 * At the end of this file is code for invoking the function calls
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52 * instead of inlining.
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53 *
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54 * The macro SET_DATA_BIT_VAL(pdata, n, val) is a bit slower than
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55 * if (val == 0)
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56 * CLEAR_DATA_BIT(pdata, n);
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57 * else
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58 * SET_DATA_BIT(pdata, n);
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59 *
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60 * Some compilers complain when the SET macros are surrounded by
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61 * parentheses, because parens require an evaluation and it is not
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62 * defined for SET macros. If SET_DATA_QBIT were defined as a
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63 * compound macro, in analogy to l_setDataQbit(), it requires
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64 * surrounding braces:
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65 * \code
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66 * #define SET_DATA_QBIT(pdata, n, val) \
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67 * {l_uint32 *_TEMP_WORD_PTR_; \
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68 * _TEMP_WORD_PTR_ = (l_uint32 *)(pdata) + ((n) >> 3); \
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69 * *_TEMP_WORD_PTR_ &= ~(0xf0000000 >> (4 * ((n) & 7))); \
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70 * *_TEMP_WORD_PTR_ |= (((val) & 15) << (28 - 4 * ((n) & 7)));}
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71 * \endcode
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72 * but if used in an if/else
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73 * \code
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74 * if (x)
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75 * SET_DATA_QBIT(...);
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76 * else
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77 * ...
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78 * \endcode
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79 * the compiler sees
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80 * \code
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81 * if (x)
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82 * {......};
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83 * else
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84 * ...
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85 * \endcode
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86 * The semicolon comes after the brace and will not compile.
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87 * This can be fixed in the call by either omitting the semicolon
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88 * or requiring another set of braces around SET_DATA_QBIT(), but
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89 * both these options break compatibility with current code, and
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90 * require special attention by anyone using the macros.
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91 *
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92 * There are (at least) two ways to fix this in the macro definitions,
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93 * suggested by Dave Bryan.
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94 * (1) Surround the braces in the macro above with
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95 * do {....} while(0)
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96 * Then the semicolon just terminates the expression.
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97 * (2) Reduce the blocks to a single expression; e.g,
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98 * *((l_uint32 *)(pdata) + ((n) >> 3)) = \
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99 * *((l_uint32 *)(pdata) + ((n) >> 3)) \
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100 * & ~(0xf0000000 >> (4 * ((n) & 7))) \
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101 * | (((val) & 15) << (28 - 4 * ((n) & 7)))
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102 * This appears to cause redundant computation, but the compiler
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103 * should evaluate the common subexpression only once.
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104 * All these methods have the same performance, giving about 300M
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105 * SET_DATA_QBIT operations per second on a fast 64 bit system.
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106 * Using the function calls instead of the macros results in about 250M
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107 * SET_DATA_QBIT operations per second, a performance hit of nearly 20%.
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108 * </pre>
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109 */
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110
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111 #define USE_INLINE_ACCESSORS 1
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112
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113 #if USE_INLINE_ACCESSORS
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114
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115 /*=============================================================*/
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116 /* Faster: use in line accessors */
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117 /*=============================================================*/
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118
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119 /*--------------------------------------------------*
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120 * 1 bit access *
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121 *--------------------------------------------------*/
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122 /*! 1 bit access - get */
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123 #define GET_DATA_BIT(pdata, n) \
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124 ((*((const l_uint32 *)(pdata) + ((n) >> 5)) >> (31 - ((n) & 31))) & 1)
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125
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126 /*! 1 bit access - set */
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127 #define SET_DATA_BIT(pdata, n) \
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128 *((l_uint32 *)(pdata) + ((n) >> 5)) |= (0x80000000 >> ((n) & 31))
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129
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130 /*! 1 bit access - clear */
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131 #define CLEAR_DATA_BIT(pdata, n) \
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132 *((l_uint32 *)(pdata) + ((n) >> 5)) &= ~(0x80000000 >> ((n) & 31))
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133
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134 /*! 1 bit access - set value (0 or 1) */
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135 #define SET_DATA_BIT_VAL(pdata, n, val) \
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136 *((l_uint32 *)(pdata) + ((n) >> 5)) = \
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137 ((*((l_uint32 *)(pdata) + ((n) >> 5)) \
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138 & (~(0x80000000 >> ((n) & 31)))) \
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139 | ((l_uint32)(val) << (31 - ((n) & 31))))
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140
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141 /*--------------------------------------------------*
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142 * 2 bit access *
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143 *--------------------------------------------------*/
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144 /*! 2 bit access - get */
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145 #define GET_DATA_DIBIT(pdata, n) \
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146 ((*((const l_uint32 *)(pdata) + ((n) >> 4)) >> (2 * (15 - ((n) & 15)))) & 3)
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147
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148 /*! 2 bit access - set value (0 ... 3) */
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149 #define SET_DATA_DIBIT(pdata, n, val) \
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150 *((l_uint32 *)(pdata) + ((n) >> 4)) = \
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151 ((*((l_uint32 *)(pdata) + ((n) >> 4)) \
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152 & (~(0xc0000000 >> (2 * ((n) & 15))))) \
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153 | ((l_uint32)((val) & 3) << (30 - 2 * ((n) & 15))))
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154
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155 /*! 2 bit access - clear */
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156 #define CLEAR_DATA_DIBIT(pdata, n) \
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157 *((l_uint32 *)(pdata) + ((n) >> 4)) &= ~(0xc0000000 >> (2 * ((n) & 15)))
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158
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159
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diff changeset
160 /*--------------------------------------------------*
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161 * 4 bit access *
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parents:
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162 *--------------------------------------------------*/
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parents:
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163 /*! 4 bit access - get */
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164 #define GET_DATA_QBIT(pdata, n) \
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165 ((*((const l_uint32 *)(pdata) + ((n) >> 3)) >> (4 * (7 - ((n) & 7)))) & 0xf)
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166
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167 /*! 4 bit access - set value (0 ... 15) */
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168 #define SET_DATA_QBIT(pdata, n, val) \
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169 *((l_uint32 *)(pdata) + ((n) >> 3)) = \
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170 ((*((l_uint32 *)(pdata) + ((n) >> 3)) \
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171 & (~(0xf0000000 >> (4 * ((n) & 7))))) \
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172 | ((l_uint32)((val) & 15) << (28 - 4 * ((n) & 7))))
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173
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diff changeset
174 /*! 4 bit access - clear */
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175 #define CLEAR_DATA_QBIT(pdata, n) \
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176 *((l_uint32 *)(pdata) + ((n) >> 3)) &= ~(0xf0000000 >> (4 * ((n) & 7)))
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177
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178
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179 /*--------------------------------------------------*
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180 * 8 bit access *
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parents:
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181 *--------------------------------------------------*/
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diff changeset
182 #ifdef L_BIG_ENDIAN
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183 /*! 8 bit access - get */
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184 #define GET_DATA_BYTE(pdata, n) \
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185 (*((const l_uint8 *)(pdata) + (n)))
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186 #else /* L_LITTLE_ENDIAN */
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187 /*! 8 bit access - get */
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188 #define GET_DATA_BYTE(pdata, n) \
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parents:
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189 (*(l_uint8 *)((l_uintptr_t)((const l_uint8 *)(pdata) + (n)) ^ 3))
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diff changeset
190 #endif /* L_BIG_ENDIAN */
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191
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192 #ifdef L_BIG_ENDIAN
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193 /*! 8 bit access - set value (0 ... 255) */
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diff changeset
194 #define SET_DATA_BYTE(pdata, n, val) \
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195 *((l_uint8 *)(pdata) + (n)) = (val)
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196 #else /* L_LITTLE_ENDIAN */
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197 /*! 8 bit access - set value (0 ... 255) */
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198 #define SET_DATA_BYTE(pdata, n, val) \
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199 *(l_uint8 *)((l_uintptr_t)((l_uint8 *)(pdata) + (n)) ^ 3) = (val)
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200 #endif /* L_BIG_ENDIAN */
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201
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202
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203 /*--------------------------------------------------*
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204 * 16 bit access *
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205 *--------------------------------------------------*/
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206 #ifdef L_BIG_ENDIAN
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207 /*! 16 bit access - get */
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208 #define GET_DATA_TWO_BYTES(pdata, n) \
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209 (*((const l_uint16 *)(pdata) + (n)))
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210 #else /* L_LITTLE_ENDIAN */
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211 /*! 16 bit access - get */
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212 #define GET_DATA_TWO_BYTES(pdata, n) \
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213 (*(l_uint16 *)((l_uintptr_t)((const l_uint16 *)(pdata) + (n)) ^ 2))
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214 #endif /* L_BIG_ENDIAN */
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215
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216 #ifdef L_BIG_ENDIAN
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217 /*! 16 bit access - set value (0 ... 65535) */
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218 #define SET_DATA_TWO_BYTES(pdata, n, val) \
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219 *((l_uint16 *)(pdata) + (n)) = (val)
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220 #else /* L_LITTLE_ENDIAN */
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221 /*! 16 bit access - set value (0 ... 65535) */
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222 #define SET_DATA_TWO_BYTES(pdata, n, val) \
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223 *(l_uint16 *)((l_uintptr_t)((l_uint16 *)(pdata) + (n)) ^ 2) = (val)
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224 #endif /* L_BIG_ENDIAN */
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225
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226
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227 /*--------------------------------------------------*
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228 * 32 bit access *
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229 *--------------------------------------------------*/
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230 /*! 32 bit access - get */
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231 #define GET_DATA_FOUR_BYTES(pdata, n) \
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232 (*((const l_uint32 *)(pdata) + (n)))
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233
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234 /*! 32 bit access - set (0 ... 4294967295) */
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235 #define SET_DATA_FOUR_BYTES(pdata, n, val) \
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236 *((l_uint32 *)(pdata) + (n)) = (val)
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237
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238
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239 #else
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240
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241 /*=============================================================*/
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242 /* Slower: use function calls for all accessors */
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243 /*=============================================================*/
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244
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245 #define GET_DATA_BIT(pdata, n) l_getDataBit(pdata, n)
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246 #define SET_DATA_BIT(pdata, n) l_setDataBit(pdata, n)
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247 #define CLEAR_DATA_BIT(pdata, n) l_clearDataBit(pdata, n)
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248 #define SET_DATA_BIT_VAL(pdata, n, val) l_setDataBitVal(pdata, n, val)
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249
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250 #define GET_DATA_DIBIT(pdata, n) l_getDataDibit(pdata, n)
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251 #define SET_DATA_DIBIT(pdata, n, val) l_setDataDibit(pdata, n, val)
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252 #define CLEAR_DATA_DIBIT(pdata, n) l_clearDataDibit(pdata, n)
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253
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254 #define GET_DATA_QBIT(pdata, n) l_getDataQbit(pdata, n)
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255 #define SET_DATA_QBIT(pdata, n, val) l_setDataQbit(pdata, n, val)
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256 #define CLEAR_DATA_QBIT(pdata, n) l_clearDataQbit(pdata, n)
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257
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258 #define GET_DATA_BYTE(pdata, n) l_getDataByte(pdata, n)
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259 #define SET_DATA_BYTE(pdata, n, val) l_setDataByte(pdata, n, val)
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260
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261 #define GET_DATA_TWO_BYTES(pdata, n) l_getDataTwoBytes(pdata, n)
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262 #define SET_DATA_TWO_BYTES(pdata, n, val) l_setDataTwoBytes(pdata, n, val)
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263
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264 #define GET_DATA_FOUR_BYTES(pdata, n) l_getDataFourBytes(pdata, n)
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265 #define SET_DATA_FOUR_BYTES(pdata, n, val) l_setDataFourBytes(pdata, n, val)
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266
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267 #endif /* USE_INLINE_ACCESSORS */
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268
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269
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270 #endif /* LEPTONICA_ARRAY_ACCESS_H */