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annotate src/video/SDL_gamma.c @ 4590:1ad70fb49fcb

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Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives. Fixes involved: 1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set. 2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints. 3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used. 4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 09 Jul 2010 21:36:41 +0530
parents f7b03b6838cb
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 "SDL_sysvideo.h"
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27
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28
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29 static void
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30 CalculateGammaRamp(float gamma, Uint16 * ramp)
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31 {
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32 int i;
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33
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34 /* 0.0 gamma is all black */
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35 if (gamma <= 0.0f) {
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36 for (i = 0; i < 256; ++i) {
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37 ramp[i] = 0;
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38 }
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39 return;
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40 } else
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41 /* 1.0 gamma is identity */
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42 if (gamma == 1.0f) {
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43 for (i = 0; i < 256; ++i) {
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44 ramp[i] = (i << 8) | i;
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45 }
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46 return;
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47 } else
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48 /* Calculate a real gamma ramp */
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49 {
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50 int value;
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51 gamma = 1.0f / gamma;
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52 for (i = 0; i < 256; ++i) {
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53 value =
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54 (int) (SDL_pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
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55 if (value > 65535) {
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56 value = 65535;
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57 }
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58 ramp[i] = (Uint16) value;
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59 }
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60 }
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61 }
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62
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63 static void
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64 CalculateGammaFromRamp(float *gamma, Uint16 * ramp)
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65 {
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66 /* The following is adapted from a post by Garrett Bass on OpenGL
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67 Gamedev list, March 4, 2000.
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68 */
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69 float sum = 0.0f;
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70 int i, count = 0;
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71
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72 *gamma = 1.0;
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73 for (i = 1; i < 256; ++i) {
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74 if ((ramp[i] != 0) && (ramp[i] != 65535)) {
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75 double B = (double) i / 256.0;
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76 double A = ramp[i] / 65535.0;
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77 sum += (float) (SDL_log(A) / SDL_log(B));
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78 count++;
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79 }
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80 }
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81 if (count && sum > 0.0f) {
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82 *gamma = 1.0f / (sum / count);
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83 }
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84 }
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85
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86 int
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87 SDL_SetGamma(float red, float green, float blue)
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88 {
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89 Uint16 ramp[3][256];
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90
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91 CalculateGammaRamp(red, ramp[0]);
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92 CalculateGammaRamp(green, ramp[1]);
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93 CalculateGammaRamp(blue, ramp[2]);
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94
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95 return SDL_SetGammaRamp(ramp[0], ramp[1], ramp[2]);
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96 }
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97
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98 /* Calculating the gamma by integrating the gamma ramps isn't exact,
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99 so this function isn't officially supported.
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100 */
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101 int
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102 SDL_GetGamma(float *red, float *green, float *blue)
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103 {
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104 int succeeded;
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105 Uint16 ramp[3][256];
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106
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107 succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]);
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108 if (succeeded >= 0) {
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109 CalculateGammaFromRamp(red, ramp[0]);
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110 CalculateGammaFromRamp(green, ramp[1]);
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111 CalculateGammaFromRamp(blue, ramp[2]);
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112 }
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113 return succeeded;
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114 }
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115
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116 static void
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117 SDL_UninitializedVideo()
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118 {
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119 SDL_SetError("Video subsystem has not been initialized");
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120 }
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121
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122 int
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123 SDL_SetGammaRampForDisplay(SDL_VideoDisplay * display, const Uint16 * red, const Uint16 * green, const Uint16 * blue)
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124 {
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125 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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126 int succeeded;
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127
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128 if (!_this) {
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129 SDL_UninitializedVideo();
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130 return -1;
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131 }
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132
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133 /* Lazily allocate the gamma tables */
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134 if (!display->gamma) {
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135 if (SDL_GetGammaRampForDisplay(display, NULL, NULL, NULL) < 0) {
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136 return -1;
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137 }
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138 }
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139
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140 /* Fill the gamma table with the new values */
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141 if (red) {
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142 SDL_memcpy(&display->gamma[0 * 256], red, 256 * sizeof(*display->gamma));
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143 }
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144 if (green) {
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145 SDL_memcpy(&display->gamma[1 * 256], green, 256 * sizeof(*display->gamma));
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146 }
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147 if (blue) {
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148 SDL_memcpy(&display->gamma[2 * 256], blue, 256 * sizeof(*display->gamma));
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149 }
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150
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151 /* Try to set the gamma ramp in the driver */
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152 succeeded = -1;
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153 if (_this && _this->SetDisplayGammaRamp) {
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154 if (SDL_GetFocusWindow()) {
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155 succeeded =
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156 _this->SetDisplayGammaRamp(_this, display, display->gamma);
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157 } else {
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158 succeeded = 0;
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159 }
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160 } else {
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161 SDL_SetError("Gamma ramp manipulation not supported");
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162 }
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163 return succeeded;
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164 }
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165
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166 int
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167 SDL_SetGammaRamp(const Uint16 * red, const Uint16 * green, const Uint16 * blue)
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168 {
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169 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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170 if (!_this) {
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171 SDL_UninitializedVideo();
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172 return -1;
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173 }
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174 return SDL_SetGammaRampForDisplay(SDL_CurrentDisplay, red, green, blue);
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175 }
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176
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177 int
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178 SDL_GetGammaRampForDisplay(SDL_VideoDisplay * display, Uint16 * red, Uint16 * green, Uint16 * blue)
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179 {
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180 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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181
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182 if (!_this) {
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183 SDL_UninitializedVideo();
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184 return -1;
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185 }
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186
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187 /* Lazily allocate the gamma table */
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188 if (!display->gamma) {
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189 size_t rampsize = (3 * 256 * sizeof(*display->gamma));
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190
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191 display->gamma = SDL_malloc(rampsize * 2);
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192 if (!display->gamma) {
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193 SDL_OutOfMemory();
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194 return -1;
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195 }
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196 if (_this && _this->GetDisplayGammaRamp) {
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197 /* Get the real hardware gamma */
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198 _this->GetDisplayGammaRamp(_this, display, display->gamma);
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199 } else {
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200 /* Assume an identity gamma */
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201 int i;
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202 for (i = 0; i < 256; ++i) {
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203 display->gamma[0 * 256 + i] = (i << 8) | i;
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204 display->gamma[1 * 256 + i] = (i << 8) | i;
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205 display->gamma[2 * 256 + i] = (i << 8) | i;
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206 }
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207 }
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208 display->saved_gamma = display->gamma + (3 * 256);
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209 SDL_memcpy(display->saved_gamma, display->gamma, rampsize);
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210 }
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211
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212 /* Just copy from our internal table */
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213 if (red) {
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214 SDL_memcpy(red, &display->gamma[0 * 256], 256 * sizeof(*red));
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215 }
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216 if (green) {
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217 SDL_memcpy(green, &display->gamma[1 * 256], 256 * sizeof(*green));
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218 }
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219 if (blue) {
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220 SDL_memcpy(blue, &display->gamma[2 * 256], 256 * sizeof(*blue));
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221 }
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222 return 0;
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223 }
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224
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225 int
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226 SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue)
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227 {
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228 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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229 if (!_this) {
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230 SDL_UninitializedVideo();
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231 return -1;
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232 }
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233 return SDL_GetGammaRampForDisplay(SDL_CurrentDisplay, red, green, blue);
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234 }
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235
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236 /* vi: set ts=4 sw=4 expandtab: */