1 | /* |
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2 | * libcucul Canvas for ultrafast compositing of Unicode letters |
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3 | * Copyright (c) 2002-2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: transform.c 769 2006-04-14 07:30:53Z sam $ |
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7 | * |
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8 | * This library is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the Do What The Fuck You Want To |
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10 | * Public License, Version 2, as published by Sam Hocevar. See |
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11 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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12 | */ |
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13 | |
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14 | /* |
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15 | * This file contains horizontal and vertical flipping routines. |
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16 | */ |
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17 | |
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18 | #include "config.h" |
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19 | |
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20 | #if !defined(__KERNEL__) |
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21 | #endif |
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22 | |
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23 | #include "cucul.h" |
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24 | #include "cucul_internals.h" |
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25 | |
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26 | static uint32_t flipchar(uint32_t ch); |
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27 | static uint32_t flopchar(uint32_t ch); |
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28 | static uint32_t rotatechar(uint32_t ch); |
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29 | |
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30 | /** \brief Invert a canvas' colours. |
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31 | * |
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32 | * This function inverts a canvas' colours (black becomes white, red |
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33 | * becomes cyan, etc.) without changing the characters in it. |
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34 | * |
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35 | * \param qq The canvas to invert. |
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36 | */ |
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37 | void cucul_invert(cucul_t *qq) |
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38 | { |
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39 | uint32_t *attr = qq->attr; |
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40 | unsigned int i; |
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41 | |
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42 | for(i = qq->height * qq->width; i--; ) |
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43 | { |
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44 | *attr = *attr ^ 0x000f000f; |
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45 | attr++; |
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46 | } |
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47 | } |
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48 | |
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49 | /** \brief Flip a canvas horizontally. |
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50 | * |
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51 | * This function flips a canvas horizontally, choosing characters that |
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52 | * look like the mirrored version wherever possible. |
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53 | * |
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54 | * \param qq The canvas to flip. |
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55 | */ |
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56 | void cucul_flip(cucul_t *qq) |
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57 | { |
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58 | unsigned int y; |
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59 | |
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60 | for(y = 0; y < qq->height; y++) |
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61 | { |
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62 | uint32_t *cleft = qq->chars + y * qq->width; |
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63 | uint32_t *cright = cleft + qq->width - 1; |
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64 | uint32_t *aleft = qq->attr + y * qq->width; |
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65 | uint32_t *aright = aleft + qq->width - 1; |
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66 | |
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67 | while(cleft < cright) |
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68 | { |
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69 | uint32_t ch; |
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70 | uint32_t attr; |
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71 | |
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72 | /* Swap attributes */ |
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73 | attr = *aright; *aright = *aleft; *aleft = attr; |
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74 | |
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75 | /* Swap characters */ |
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76 | ch = *cright; *cright = flipchar(*cleft); *cleft = flipchar(ch); |
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77 | |
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78 | cleft++; cright--; aleft++; aright--; |
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79 | } |
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80 | |
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81 | if(cleft == cright) |
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82 | *cleft = flipchar(*cleft); |
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83 | } |
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84 | } |
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85 | |
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86 | /** \brief Flip a canvas vertically. |
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87 | * |
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88 | * This function flips a canvas vertically, choosing characters that |
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89 | * look like the mirrored version wherever possible. |
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90 | * |
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91 | * \param qq The canvas to flop. |
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92 | */ |
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93 | void cucul_flop(cucul_t *qq) |
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94 | { |
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95 | unsigned int x; |
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96 | |
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97 | for(x = 0; x < qq->width; x++) |
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98 | { |
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99 | uint32_t *ctop = qq->chars + x; |
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100 | uint32_t *cbottom = ctop + qq->width * (qq->height - 1); |
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101 | uint32_t *atop = qq->attr + x; |
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102 | uint32_t *abottom = atop + qq->width * (qq->height - 1); |
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103 | |
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104 | while(ctop < cbottom) |
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105 | { |
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106 | uint32_t ch; |
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107 | uint32_t attr; |
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108 | |
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109 | /* Swap attributes */ |
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110 | attr = *abottom; *abottom = *atop; *atop = attr; |
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111 | |
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112 | /* Swap characters */ |
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113 | ch = *cbottom; *cbottom = flopchar(*ctop); *ctop = flopchar(ch); |
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114 | |
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115 | ctop += qq->width; cbottom -= qq->width; |
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116 | atop += qq->width; abottom -= qq->width; |
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117 | } |
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118 | |
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119 | if(ctop == cbottom) |
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120 | *ctop = flopchar(*ctop); |
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121 | } |
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122 | } |
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123 | |
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124 | /** \brief Rotate a canvas. |
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125 | * |
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126 | * This function applies a 180 degrees transformation to a canvas, |
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127 | * choosing characters that look like the mirrored version wherever |
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128 | * possible. |
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129 | * |
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130 | * \param qq The canvas to rotate. |
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131 | */ |
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132 | void cucul_rotate(cucul_t *qq) |
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133 | { |
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134 | uint32_t *cbegin = qq->chars; |
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135 | uint32_t *cend = cbegin + qq->width * qq->height - 1; |
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136 | uint32_t *abegin = qq->attr; |
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137 | uint32_t *aend = abegin + qq->width * qq->height - 1; |
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138 | |
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139 | while(cbegin < cend) |
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140 | { |
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141 | uint32_t ch; |
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142 | uint32_t attr; |
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143 | |
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144 | /* Swap attributes */ |
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145 | attr = *aend; *aend = *abegin; *abegin = attr; |
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146 | |
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147 | /* Swap characters */ |
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148 | ch = *cend; *cend = rotatechar(*cbegin); *cbegin = rotatechar(ch); |
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149 | |
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150 | cbegin++; cend--; abegin++; aend--; |
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151 | } |
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152 | |
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153 | if(cbegin == cend) |
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154 | *cbegin = rotatechar(*cbegin); |
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155 | } |
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156 | |
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157 | static uint32_t flipchar(uint32_t ch) |
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158 | { |
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159 | int i; |
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160 | |
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161 | static uint32_t const noflip[] = |
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162 | { |
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163 | /* ASCII */ |
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164 | (uint32_t)' ', (uint32_t)'"', (uint32_t)'#', (uint32_t)'\'', |
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165 | (uint32_t)'-', (uint32_t)'.', (uint32_t)'*', (uint32_t)'+', |
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166 | (uint32_t)':', (uint32_t)'=', |
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167 | (uint32_t)'0', (uint32_t)'8', (uint32_t)'A', (uint32_t)'H', |
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168 | (uint32_t)'I', (uint32_t)'M', (uint32_t)'O', (uint32_t)'T', |
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169 | (uint32_t)'U', (uint32_t)'V', (uint32_t)'W', (uint32_t)'X', |
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170 | (uint32_t)'Y', (uint32_t)'^', (uint32_t)'_', (uint32_t)'i', |
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171 | (uint32_t)'o', (uint32_t)'v', (uint32_t)'w', (uint32_t)'x', |
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172 | (uint32_t)'|', |
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173 | /* Unicode */ |
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174 | 0x2591, 0x2592, 0x2593, 0x2588, 0x2584, 0x2580, /* ░ ▒ ▓ █ ▄ ▀ */ |
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175 | 0 |
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176 | }; |
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177 | |
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178 | static uint32_t const pairs[] = |
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179 | { |
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180 | /* ASCII */ |
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181 | (uint32_t)'(', (uint32_t)')', (uint32_t)'/', (uint32_t)'\\', |
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182 | (uint32_t)'<', (uint32_t)'>', (uint32_t)'[', (uint32_t)']', |
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183 | (uint32_t)'b', (uint32_t)'d', (uint32_t)'p', (uint32_t)'q', |
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184 | (uint32_t)'{', (uint32_t)'}', |
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185 | /* ASCII-Unicode */ |
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186 | (uint32_t)';', 0x204f, /* ; ⁏ */ |
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187 | (uint32_t)'`', 0x00b4, /* ` ´ */ |
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188 | (uint32_t)'E', 0x018e, /* E Ǝ */ |
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189 | (uint32_t)'N', 0x0418, /* N И */ |
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190 | (uint32_t)'R', 0x042f, /* R Я */ |
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191 | (uint32_t)'S', 0x01a7, /* S Ƨ */ |
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192 | (uint32_t)'c', 0x0254, /* c ɔ */ |
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193 | (uint32_t)'e', 0x0258, /* e ɘ */ |
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194 | /* Unicode only */ |
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195 | 0x258c, 0x2590, /* ▌ ▐ */ |
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196 | 0x2596, 0x2597, /* ▖ ▗ */ |
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197 | 0x2598, 0x259d, /* ▘ ▝ */ |
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198 | 0x2599, 0x259f, /* ▙ ▟ */ |
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199 | 0x259a, 0x259e, /* ▚ ▞ */ |
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200 | 0x259b, 0x259c, /* ▛ ▜ */ |
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201 | 0 |
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202 | }; |
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203 | |
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204 | for(i = 0; noflip[i]; i++) |
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205 | if(ch == noflip[i]) |
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206 | return ch; |
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207 | |
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208 | for(i = 0; pairs[i]; i++) |
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209 | if(ch == pairs[i]) |
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210 | return pairs[i ^ 1]; |
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211 | |
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212 | return ch; |
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213 | } |
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214 | |
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215 | static uint32_t flopchar(uint32_t ch) |
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216 | { |
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217 | int i; |
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218 | |
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219 | static uint32_t const noflop[] = |
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220 | { |
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221 | /* ASCII */ |
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222 | (uint32_t)' ', (uint32_t)'(', (uint32_t)')', (uint32_t)'*', |
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223 | (uint32_t)'+', (uint32_t)'-', |
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224 | (uint32_t)'0', (uint32_t)'3', (uint32_t)'8', (uint32_t)':', |
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225 | (uint32_t)'<', (uint32_t)'=', (uint32_t)'>', (uint32_t)'B', |
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226 | (uint32_t)'C', (uint32_t)'D', (uint32_t)'E', (uint32_t)'H', |
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227 | (uint32_t)'I', (uint32_t)'K', (uint32_t)'O', (uint32_t)'X', |
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228 | (uint32_t)'[', (uint32_t)']', (uint32_t)'c', (uint32_t)'o', |
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229 | (uint32_t)'{', (uint32_t)'|', (uint32_t)'}', |
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230 | /* Unicode */ |
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231 | 0x2591, 0x2592, 0x2593, 0x2588, 0x258c, 0x2590, /* ░ ▒ ▓ █ ▌ ▐ */ |
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232 | 0 |
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233 | }; |
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234 | |
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235 | static uint32_t const pairs[] = |
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236 | { |
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237 | /* ASCII */ |
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238 | (uint32_t)'/', (uint32_t)'\\', (uint32_t)'M', (uint32_t)'W', |
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239 | (uint32_t)',', (uint32_t)'`', (uint32_t)'b', (uint32_t)'p', |
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240 | (uint32_t)'d', (uint32_t)'q', (uint32_t)'p', (uint32_t)'q', |
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241 | (uint32_t)'f', (uint32_t)'t', (uint32_t)'.', (uint32_t)'\'', |
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242 | /* ASCII-Unicode */ |
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243 | (uint32_t)'_', 0x2594, /* _ ▔ */ |
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244 | (uint32_t)'`', 0x201a, /* ` ‚ */ |
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245 | (uint32_t)'!', 0x00a1, /* ! ¡ */ |
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246 | (uint32_t)'N', 0x0418, /* N И */ |
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247 | (uint32_t)'P', 0x042c, /* P Ь */ |
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248 | (uint32_t)'S', 0x01a7, /* S Ƨ */ |
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249 | (uint32_t)'v', 0x028c, /* v ʌ */ |
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250 | (uint32_t)'w', 0x028d, /* w ʍ */ |
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251 | /* Unicode only */ |
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252 | 0x2584, 0x2580, /* ▄ ▀ */ |
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253 | 0x2596, 0x2598, /* ▖ ▘ */ |
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254 | 0x2597, 0x259d, /* ▗ ▝ */ |
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255 | 0x2599, 0x259b, /* ▙ ▛ */ |
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256 | 0x259f, 0x259c, /* ▟ ▜ */ |
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257 | 0x259a, 0x259e, /* ▚ ▞ */ |
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258 | 0 |
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259 | }; |
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260 | |
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261 | for(i = 0; noflop[i]; i++) |
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262 | if(ch == noflop[i]) |
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263 | return ch; |
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264 | |
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265 | for(i = 0; pairs[i]; i++) |
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266 | if(ch == pairs[i]) |
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267 | return pairs[i ^ 1]; |
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268 | |
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269 | return ch; |
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270 | } |
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271 | |
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272 | static uint32_t rotatechar(uint32_t ch) |
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273 | { |
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274 | int i; |
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275 | |
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276 | static uint32_t const norotate[] = |
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277 | { |
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278 | /* ASCII - FIXME: a lot are missing */ |
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279 | (uint32_t)' ', (uint32_t)'*', (uint32_t)'+', (uint32_t)'-', |
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280 | (uint32_t)'0', (uint32_t)'8', (uint32_t)':', (uint32_t)'=', |
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281 | /* Unicode */ |
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282 | 0x2591, 0x2592, 0x2593, 0x2588, 0x259a, 0x259e, /* ░ ▒ ▓ █ ▚ ▞ */ |
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283 | 0 |
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284 | }; |
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285 | |
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286 | static uint32_t const pairs[] = |
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287 | { |
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288 | /* ASCII */ |
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289 | (uint32_t)'(', (uint32_t)')', (uint32_t)'<', (uint32_t)'>', |
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290 | (uint32_t)'[', (uint32_t)']', (uint32_t)'{', (uint32_t)'}', |
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291 | (uint32_t)'.', (uint32_t)'\'', |
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292 | (uint32_t)'6', (uint32_t)'9', |
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293 | (uint32_t)'M', (uint32_t)'W', (uint32_t)'b', (uint32_t)'q', |
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294 | (uint32_t)'d', (uint32_t)'p', (uint32_t)'n', (uint32_t)'u', |
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295 | /* ASCII-Unicode */ |
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296 | (uint32_t)'_', 0x2594, /* _ ▔ */ |
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297 | (uint32_t)',', 0x02bb, /* , ʻ */ |
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298 | (uint32_t)'!', 0x00a1, /* ! ¡ */ |
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299 | (uint32_t)'?', 0x00bf, /* ? ¿ */ |
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300 | (uint32_t)'E', 0x018e, /* E Ǝ */ |
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301 | (uint32_t)'F', 0x2132, /* F Ⅎ */ |
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302 | (uint32_t)'a', 0x0250, /* a ɐ */ |
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303 | (uint32_t)'c', 0x0254, /* c ɔ */ |
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304 | (uint32_t)'e', 0x0259, /* e ə */ |
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305 | (uint32_t)'f', 0x025f, /* f ɟ */ |
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306 | (uint32_t)'h', 0x0265, /* h ɥ */ |
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307 | (uint32_t)'k', 0x029e, /* k ʞ */ |
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308 | (uint32_t)'m', 0x026f, /* m ɯ */ |
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309 | (uint32_t)'r', 0x0279, /* r ɹ */ |
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310 | (uint32_t)'t', 0x0287, /* t ʇ */ |
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311 | (uint32_t)'v', 0x028c, /* v ʌ */ |
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312 | (uint32_t)'w', 0x028d, /* w ʍ */ |
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313 | (uint32_t)'y', 0x028e, /* y ʎ */ |
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314 | /* Unicode only */ |
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315 | 0x258c, 0x2590, /* ▌ ▐ */ |
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316 | 0x2584, 0x2580, /* ▄ ▀ */ |
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317 | 0x2596, 0x259d, /* ▖ ▝ */ |
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318 | 0x2597, 0x2598, /* ▗ ▘ */ |
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319 | 0x2599, 0x259c, /* ▙ ▜ */ |
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320 | 0x259f, 0x259b, /* ▟ ▛ */ |
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321 | 0 |
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322 | }; |
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323 | |
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324 | for(i = 0; norotate[i]; i++) |
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325 | if(ch == norotate[i]) |
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326 | return ch; |
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327 | |
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328 | for(i = 0; pairs[i]; i++) |
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329 | if(ch == pairs[i]) |
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330 | return pairs[i ^ 1]; |
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331 | |
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332 | return ch; |
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333 | } |
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334 | |
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