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annotate src/video/SDL_gamma.c @ 2993:2fad80c77c17

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Technically more correct
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2009 19:26:50 +0000
parents 99210400e8b9
children 7e30c2dc7783
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Gamma correction support */
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25
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26 #include "../libm/math.h"
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27
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28 #include "SDL_sysvideo.h"
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29
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30
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31 static void
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32 CalculateGammaRamp(float gamma, Uint16 * ramp)
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33 {
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34 int i;
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35
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36 /* 0.0 gamma is all black */
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37 if (gamma <= 0.0f) {
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38 for (i = 0; i < 256; ++i) {
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39 ramp[i] = 0;
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40 }
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41 return;
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42 } else
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43 /* 1.0 gamma is identity */
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44 if (gamma == 1.0f) {
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45 for (i = 0; i < 256; ++i) {
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46 ramp[i] = (i << 8) | i;
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47 }
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48 return;
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49 } else
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50 /* Calculate a real gamma ramp */
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51 {
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52 int value;
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53 gamma = 1.0f / gamma;
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54 for (i = 0; i < 256; ++i) {
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55 value = (int) (pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
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56 if (value > 65535) {
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57 value = 65535;
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58 }
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59 ramp[i] = (Uint16) value;
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60 }
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61 }
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62 }
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63
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64 static void
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65 CalculateGammaFromRamp(float *gamma, Uint16 * ramp)
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66 {
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67 /* The following is adapted from a post by Garrett Bass on OpenGL
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68 Gamedev list, March 4, 2000.
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69 */
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70 float sum = 0.0f;
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71 int i, count = 0;
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72
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73 *gamma = 1.0;
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74 for (i = 1; i < 256; ++i) {
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75 if ((ramp[i] != 0) && (ramp[i] != 65535)) {
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76 double B = (double) i / 256.0;
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77 double A = ramp[i] / 65535.0;
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78 sum += (float) (log(A) / log(B));
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79 count++;
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80 }
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81 }
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82 if (count && sum > 0.0f) {
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83 *gamma = 1.0f / (sum / count);
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84 }
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85 }
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86
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87 int
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88 SDL_SetGamma(float red, float green, float blue)
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89 {
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90 Uint16 ramp[3][256];
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91
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92 CalculateGammaRamp(red, ramp[0]);
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93 CalculateGammaRamp(green, ramp[1]);
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94 CalculateGammaRamp(blue, ramp[2]);
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95
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96 return SDL_SetGammaRamp(ramp[0], ramp[1], ramp[2]);
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97 }
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98
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99 /* Calculating the gamma by integrating the gamma ramps isn't exact,
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100 so this function isn't officially supported.
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101 */
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102 int
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103 SDL_GetGamma(float *red, float *green, float *blue)
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104 {
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105 int succeeded;
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106 Uint16 ramp[3][256];
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107
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108 succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]);
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109 if (succeeded >= 0) {
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110 CalculateGammaFromRamp(red, ramp[0]);
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111 CalculateGammaFromRamp(green, ramp[1]);
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112 CalculateGammaFromRamp(blue, ramp[2]);
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113 }
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114 return succeeded;
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115 }
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116
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117 int
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118 SDL_SetGammaRamp(const Uint16 * red, const Uint16 * green,
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119 const Uint16 * blue)
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120 {
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121 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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122 int succeeded;
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123
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124 /* Lazily allocate the gamma tables */
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125 if (!SDL_CurrentDisplay.gamma) {
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126 SDL_GetGammaRamp(NULL, NULL, NULL);
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127 }
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128
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129 /* Fill the gamma table with the new values */
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130 if (red) {
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131 SDL_memcpy(&SDL_CurrentDisplay.gamma[0 * 256], red,
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132 256 * sizeof(*SDL_CurrentDisplay.gamma));
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133 }
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134 if (green) {
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135 SDL_memcpy(&SDL_CurrentDisplay.gamma[1 * 256], green,
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136 256 * sizeof(*SDL_CurrentDisplay.gamma));
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137 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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138 if (blue) {
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139 SDL_memcpy(&SDL_CurrentDisplay.gamma[2 * 256], blue,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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140 256 * sizeof(*SDL_CurrentDisplay.gamma));
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141 }
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142
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143 /* Try to set the gamma ramp in the driver */
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144 succeeded = -1;
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145 if (_this && _this->SetDisplayGammaRamp) {
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146 if (SDL_GetFocusWindow()) {
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147 succeeded =
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148 _this->SetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma);
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149 } else {
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150 succeeded = 0;
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151 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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152 } else {
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153 SDL_SetError("Gamma ramp manipulation not supported");
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154 }
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155 return succeeded;
0
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156 }
74212992fb08 Initial revision
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157
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158 int
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159 SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue)
0
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160 {
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161 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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162
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163 /* Lazily allocate the gamma table */
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164 if (!SDL_CurrentDisplay.gamma) {
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165 size_t rampsize = (3 * 256 * sizeof(*SDL_CurrentDisplay.gamma));
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166
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167 SDL_CurrentDisplay.gamma = SDL_malloc(rampsize * 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
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168 if (!SDL_CurrentDisplay.gamma) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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169 SDL_OutOfMemory();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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170 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
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171 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
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172 if (_this && _this->GetDisplayGammaRamp) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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173 /* Get the real hardware gamma */
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174 _this->GetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
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175 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
176 /* Assume an identity gamma */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
177 int i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
178 for (i = 0; i < 256; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
179 SDL_CurrentDisplay.gamma[0 * 256 + i] = (i << 8) | i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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180 SDL_CurrentDisplay.gamma[1 * 256 + i] = (i << 8) | i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
181 SDL_CurrentDisplay.gamma[2 * 256 + i] = (i << 8) | i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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182 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1869
diff changeset
183 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
184 SDL_CurrentDisplay.saved_gamma = SDL_CurrentDisplay.gamma + (3 * 256);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
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185 SDL_memcpy(SDL_CurrentDisplay.saved_gamma, SDL_CurrentDisplay.gamma,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
186 rampsize);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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187 }
0
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188
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189 /* Just copy from our internal table */
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diff changeset
190 if (red) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
191 SDL_memcpy(red, &SDL_CurrentDisplay.gamma[0 * 256],
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
192 256 * sizeof(*red));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
193 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1869
diff changeset
194 if (green) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
195 SDL_memcpy(green, &SDL_CurrentDisplay.gamma[1 * 256],
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
196 256 * sizeof(*green));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1869
diff changeset
197 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
198 if (blue) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
199 SDL_memcpy(blue, &SDL_CurrentDisplay.gamma[2 * 256],
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
200 256 * sizeof(*blue));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1869
diff changeset
201 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
202 return 0;
0
74212992fb08 Initial revision
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diff changeset
203 }
1895
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diff changeset
204
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
205 /* vi: set ts=4 sw=4 expandtab: */