Mercurial > sdl-ios-xcode
annotate src/video/SDL_gamma.c @ 2153:760c1bd2d625
Reverted mousewheel support in 1.2, since it breaks binary compatibility.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 06 Jul 2007 13:45:10 +0000 |
parents | c121d94672cb |
children | e1da92da346c |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Gamma correction support */ | |
25 | |
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26 #ifdef HAVE_MATH_H |
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27 #include <math.h> /* Used for calculating gamma ramps */ |
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28 #else |
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29 /* Math routines from uClibc: http://www.uclibc.org */ |
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30 #include "math_private.h" |
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31 #include "e_sqrt.h" |
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32 #include "e_pow.h" |
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33 #include "e_log.h" |
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34 #define pow(x, y) __ieee754_pow(x, y) |
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35 #define log(x) __ieee754_log(x) |
0 | 36 #endif |
37 | |
38 #include "SDL_sysvideo.h" | |
39 | |
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40 |
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41 static void |
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42 CalculateGammaRamp(float gamma, Uint16 * ramp) |
0 | 43 { |
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44 int i; |
0 | 45 |
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46 /* 0.0 gamma is all black */ |
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47 if (gamma <= 0.0f) { |
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48 for (i = 0; i < 256; ++i) { |
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49 ramp[i] = 0; |
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50 } |
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51 return; |
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52 } else |
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53 /* 1.0 gamma is identity */ |
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54 if (gamma == 1.0f) { |
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55 for (i = 0; i < 256; ++i) { |
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56 ramp[i] = (i << 8) | i; |
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57 } |
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58 return; |
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59 } else |
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60 /* Calculate a real gamma ramp */ |
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61 { |
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62 int value; |
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63 gamma = 1.0f / gamma; |
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64 for (i = 0; i < 256; ++i) { |
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65 value = (int) (pow((double) i / 256.0, gamma) * 65535.0 + 0.5); |
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66 if (value > 65535) { |
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67 value = 65535; |
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68 } |
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69 ramp[i] = (Uint16) value; |
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70 } |
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71 } |
0 | 72 } |
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73 static void |
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74 CalculateGammaFromRamp(float *gamma, Uint16 * ramp) |
0 | 75 { |
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76 /* The following is adapted from a post by Garrett Bass on OpenGL |
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77 Gamedev list, March 4, 2000. |
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78 */ |
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79 float sum = 0.0f; |
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80 int i, count = 0; |
0 | 81 |
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82 *gamma = 1.0; |
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83 for (i = 1; i < 256; ++i) { |
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84 if ((ramp[i] != 0) && (ramp[i] != 65535)) { |
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85 double B = (double) i / 256.0; |
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86 double A = ramp[i] / 65535.0; |
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87 sum += (float) (log(A) / log(B)); |
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88 count++; |
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89 } |
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90 } |
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91 if (count && sum > 0.0f) { |
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92 *gamma = 1.0f / (sum / count); |
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93 } |
0 | 94 } |
95 | |
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96 int |
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97 SDL_SetGamma(float red, float green, float blue) |
0 | 98 { |
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99 Uint16 ramp[3][256]; |
0 | 100 |
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101 CalculateGammaRamp(red, ramp[0]); |
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102 CalculateGammaRamp(green, ramp[1]); |
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103 CalculateGammaRamp(blue, ramp[2]); |
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104 |
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105 return SDL_SetGammaRamp(ramp[0], ramp[1], ramp[2]); |
0 | 106 } |
107 | |
108 /* Calculating the gamma by integrating the gamma ramps isn't exact, | |
109 so this function isn't officially supported. | |
110 */ | |
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111 int |
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112 SDL_GetGamma(float *red, float *green, float *blue) |
0 | 113 { |
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114 int succeeded; |
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115 Uint16 ramp[3][256]; |
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117 succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]); |
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118 if (succeeded >= 0) { |
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119 CalculateGammaFromRamp(red, ramp[0]); |
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120 CalculateGammaFromRamp(green, ramp[1]); |
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121 CalculateGammaFromRamp(blue, ramp[2]); |
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122 } |
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123 return succeeded; |
0 | 124 } |
125 | |
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126 int |
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127 SDL_SetGammaRamp(const Uint16 * red, const Uint16 * green, |
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128 const Uint16 * blue) |
0 | 129 { |
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130 SDL_VideoDevice *_this = SDL_GetVideoDevice(); |
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131 int succeeded; |
0 | 132 |
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133 /* Lazily allocate the gamma tables */ |
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134 if (!SDL_CurrentDisplay.gamma) { |
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135 SDL_GetGammaRamp(NULL, NULL, NULL); |
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136 } |
0 | 137 |
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138 /* Fill the gamma table with the new values */ |
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139 if (red) { |
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140 SDL_memcpy(&SDL_CurrentDisplay.gamma[0 * 256], red, |
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141 256 * sizeof(*SDL_CurrentDisplay.gamma)); |
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142 } |
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143 if (green) { |
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144 SDL_memcpy(&SDL_CurrentDisplay.gamma[1 * 256], green, |
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145 256 * sizeof(*SDL_CurrentDisplay.gamma)); |
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146 } |
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147 if (blue) { |
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148 SDL_memcpy(&SDL_CurrentDisplay.gamma[2 * 256], blue, |
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149 256 * sizeof(*SDL_CurrentDisplay.gamma)); |
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150 } |
0 | 151 |
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152 /* Try to set the gamma ramp in the driver */ |
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153 succeeded = -1; |
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154 if (_this && _this->SetDisplayGammaRamp) { |
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155 if (SDL_GetFocusWindow()) { |
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156 succeeded = |
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157 _this->SetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma); |
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158 } else { |
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159 succeeded = 0; |
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160 } |
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161 } else { |
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162 SDL_SetError("Gamma ramp manipulation not supported"); |
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163 } |
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164 return succeeded; |
0 | 165 } |
166 | |
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167 int |
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168 SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue) |
0 | 169 { |
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170 SDL_VideoDevice *_this = SDL_GetVideoDevice(); |
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171 |
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172 /* Lazily allocate the gamma table */ |
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173 if (!SDL_CurrentDisplay.gamma) { |
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174 size_t rampsize = (3 * 256 * sizeof(*SDL_CurrentDisplay.gamma)); |
0 | 175 |
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176 SDL_CurrentDisplay.gamma = SDL_malloc(rampsize * 2); |
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177 if (!SDL_CurrentDisplay.gamma) { |
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178 SDL_OutOfMemory(); |
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179 return -1; |
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180 } |
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181 if (_this && _this->GetDisplayGammaRamp) { |
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182 /* Get the real hardware gamma */ |
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183 _this->GetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma); |
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184 } else { |
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185 /* Assume an identity gamma */ |
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186 int i; |
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187 for (i = 0; i < 256; ++i) { |
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188 SDL_CurrentDisplay.gamma[0 * 256 + i] = (i << 8) | i; |
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189 SDL_CurrentDisplay.gamma[1 * 256 + i] = (i << 8) | i; |
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190 SDL_CurrentDisplay.gamma[2 * 256 + i] = (i << 8) | i; |
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191 } |
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192 } |
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193 SDL_CurrentDisplay.saved_gamma = SDL_CurrentDisplay.gamma + (3 * 256); |
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194 SDL_memcpy(SDL_CurrentDisplay.saved_gamma, SDL_CurrentDisplay.gamma, |
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195 rampsize); |
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196 } |
0 | 197 |
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198 /* Just copy from our internal table */ |
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199 if (red) { |
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200 SDL_memcpy(red, &SDL_CurrentDisplay.gamma[0 * 256], |
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201 256 * sizeof(*red)); |
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202 } |
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203 if (green) { |
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204 SDL_memcpy(green, &SDL_CurrentDisplay.gamma[1 * 256], |
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205 256 * sizeof(*green)); |
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206 } |
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207 if (blue) { |
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208 SDL_memcpy(blue, &SDL_CurrentDisplay.gamma[2 * 256], |
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209 256 * sizeof(*blue)); |
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210 } |
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211 return 0; |
0 | 212 } |
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213 |
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214 /* vi: set ts=4 sw=4 expandtab: */ |