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1 /* |
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2 * LIBOIL - Library of Optimized Inner Loops |
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3 * Copyright (c) 2005 David A. Schleef <ds@schleef.org> |
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4 * All rights reserved. |
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5 * |
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6 * Redistribution and use in source and binary forms, with or without |
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7 * modification, are permitted provided that the following conditions |
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8 * are met: |
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9 * 1. Redistributions of source code must retain the above copyright |
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10 * notice, this list of conditions and the following disclaimer. |
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11 * 2. Redistributions in binary form must reproduce the above copyright |
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12 * notice, this list of conditions and the following disclaimer in the |
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13 * documentation and/or other materials provided with the distribution. |
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14 * |
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15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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25 * POSSIBILITY OF SUCH DAMAGE. |
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26 */ |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include "config.h" |
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30 #endif |
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31 |
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32 #include <liboil/liboilrandom.h> |
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33 #include "liboil/liboilcolorspace.h" |
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34 #include <stdlib.h> |
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35 |
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36 |
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37 /** |
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38 * SECTION:liboilrandom |
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39 * @title: Random Number Generation |
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40 * @short_description: Random number generation |
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41 */ |
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42 |
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43 static void |
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44 _oil_random_bits (void *dest, int n) |
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45 { |
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46 int i; |
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47 uint8_t *d = dest; |
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48 for(i=0;i<n;i++){ |
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49 d[i] = (rand()>>16); |
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50 } |
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51 } |
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52 |
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53 /** |
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54 * oil_random_s32: |
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55 * @dest: |
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56 * @n: |
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57 * |
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58 * Writes random values in the range [-(1<<31), (1<<31)-1] to the |
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59 * destination array. |
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60 */ |
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61 #ifdef __SYMBIAN32__ |
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62 EXPORT_C |
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63 #endif |
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64 void |
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65 oil_random_s32(oil_type_s32 *dest, int n) |
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66 { |
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67 _oil_random_bits (dest, n*4); |
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68 } |
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69 |
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70 /** |
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71 * oil_random_s64: |
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72 * |
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73 * Writes random values in the range [-(1<<63), (1<<63)-1] to the |
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74 * destination array. |
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75 */ |
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76 #ifdef __SYMBIAN32__ |
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77 EXPORT_C |
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78 #endif |
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79 void |
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80 oil_random_s64 (oil_type_s64 *dest, int n) |
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81 { |
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82 _oil_random_bits (dest, n*8); |
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83 } |
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84 |
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85 /** |
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86 * oil_random_s16: |
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87 * |
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88 * Writes random values in the range [-(1<<15), (1<<15)-1] to the |
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89 * destination array. |
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90 */ |
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91 #ifdef __SYMBIAN32__ |
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92 EXPORT_C |
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93 #endif |
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94 void |
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95 oil_random_s16 (oil_type_s16 *dest, int n) |
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96 { |
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97 _oil_random_bits (dest, n*2); |
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98 } |
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99 |
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100 /** |
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101 * oil_random_s8: |
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102 * |
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103 * Writes random values in the range [-(1<<7), (1<<7)-1] to the |
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104 * destination array. |
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105 */ |
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106 #ifdef __SYMBIAN32__ |
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107 EXPORT_C |
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108 #endif |
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109 void |
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110 oil_random_s8 (oil_type_s8 *dest, int n) |
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111 { |
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112 _oil_random_bits (dest, n); |
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113 } |
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114 |
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115 /** |
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116 * oil_random_u32: |
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117 * |
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118 * Writes random values in the range [0, (1<<32)-1] to the |
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119 * destination array. |
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120 */ |
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121 #ifdef __SYMBIAN32__ |
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122 EXPORT_C |
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123 #endif |
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124 void |
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125 oil_random_u32 (oil_type_u32 *dest, int n) |
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126 { |
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127 _oil_random_bits (dest, n*4); |
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128 } |
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129 |
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130 /** |
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131 * oil_random_u64: |
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132 * |
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133 * Writes random values in the range [0, (1<<64)-1] to the |
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134 * destination array. |
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135 */ |
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136 #ifdef __SYMBIAN32__ |
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137 EXPORT_C |
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138 #endif |
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139 void |
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140 oil_random_u64 (oil_type_u64 *dest, int n) |
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141 { |
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142 _oil_random_bits (dest, n*8); |
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143 } |
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144 |
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145 /** |
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146 * oil_random_u16: |
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147 * |
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148 * Writes random values in the range [0, (1<<16)-1] to the |
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149 * destination array. |
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150 */ |
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151 #ifdef __SYMBIAN32__ |
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152 EXPORT_C |
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153 #endif |
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154 void |
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155 oil_random_u16 (oil_type_u16 *dest, int n) |
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156 { |
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157 _oil_random_bits (dest, n*2); |
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158 } |
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159 |
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160 /** |
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161 * oil_random_u8: |
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162 * |
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163 * Writes random values in the range [0, (1<<8)-1] to the |
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164 * destination array. |
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165 */ |
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166 #ifdef __SYMBIAN32__ |
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167 EXPORT_C |
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168 #endif |
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169 void |
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170 oil_random_u8 (oil_type_u8 *dest, int n) |
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171 { |
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172 _oil_random_bits (dest, n); |
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173 } |
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174 |
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175 /** |
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176 * oil_random_f64: |
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177 * |
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178 * Writes random double-precision floating point values in the |
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179 * range [0, 1.0) to the destination array. |
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180 */ |
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181 #ifdef __SYMBIAN32__ |
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182 EXPORT_C |
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183 #endif |
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184 void |
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185 oil_random_f64 (oil_type_f64 *dest, int n) |
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186 { |
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187 int i; |
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188 for(i=0;i<n;i++){ |
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189 dest[i] = (((rand()/(RAND_MAX+1.0))+rand())/(RAND_MAX+1.0)); |
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190 } |
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191 } |
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192 |
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193 /** |
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194 * oil_random_f32: |
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195 * |
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196 * Writes random single-precision floating point values in the |
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197 * range [0, 1.0) to the destination array. |
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198 */ |
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199 #ifdef __SYMBIAN32__ |
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200 EXPORT_C |
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201 #endif |
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202 void |
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203 oil_random_f32 (oil_type_f32 *dest, int n) |
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204 { |
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205 int i; |
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206 for(i=0;i<n;i++){ |
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207 dest[i] = (rand()/(RAND_MAX+1.0)); |
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208 } |
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209 } |
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210 |
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211 /** |
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212 * oil_random_alpha: |
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213 * |
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214 * Writes random values in the range [0, 255] to the destination |
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215 * array suitable for alpha values. This is similar to oil_random_u8(), |
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216 * except the values 0 and 255 are strongly favored. |
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217 */ |
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218 #ifdef __SYMBIAN32__ |
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219 EXPORT_C |
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220 #endif |
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221 void |
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222 oil_random_alpha(uint8_t *dest, int n) |
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223 { |
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224 int i; |
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225 int x; |
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226 for(i=0;i<n;i++){ |
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227 x = ((rand()>>8) & 0x1ff) - 0x80; |
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228 if (x<0) x = 0; |
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229 if (x>255) x = 255; |
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230 dest[i] = x; |
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231 } |
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232 } |
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233 |
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234 /** |
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235 * oil_random_argb: |
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236 * @dest: destination array. |
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237 * @n: number of values to write. |
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238 * |
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239 * Creates valid random RGBA values and places them in the destination |
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240 * array. |
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241 */ |
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242 #ifdef __SYMBIAN32__ |
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243 EXPORT_C |
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244 #endif |
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245 void |
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246 oil_random_argb(uint32_t *dest, int n) |
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247 { |
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248 int i; |
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249 int x; |
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250 for(i=0;i<n;i++){ |
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251 x = ((rand()>>8) & 0x1ff) - 0x80; |
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252 if (x<0) x = 0; |
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253 if (x>255) x = 255; |
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254 dest[i] = oil_argb_noclamp(x, |
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255 oil_muldiv_255(x,oil_rand_u8()), |
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256 oil_muldiv_255(x,oil_rand_u8()), |
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257 oil_muldiv_255(x,oil_rand_u8())); |
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258 } |
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259 |
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260 } |
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261 |
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262 |