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annotate src/video/SDL_gamma.c @ 2896:1ef2f1e75ff7

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Date: Sat, 20 Dec 2008 23:25:19 +0100 From: Couriersud Subject: 32 & 16 bit versions of blendrect and blendline attached are 32, 16 and 15 bit versions of the blendrect and blendline functionality. There was an issue with the bresenham alg. in drawline which I also fixed.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 20 Dec 2008 23:19:20 +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 }
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138 if (blue) {
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139 SDL_memcpy(&SDL_CurrentDisplay.gamma[2 * 256], blue,
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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 }
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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 }
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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 {
1895
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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) {
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169 SDL_OutOfMemory();
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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);
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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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diff changeset
177 int i;
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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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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 }
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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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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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186 rampsize);
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187 }
0
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188
1895
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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.
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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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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
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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.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
205 /* vi: set ts=4 sw=4 expandtab: */