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annotate src/video/x11/SDL_x11gamma.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 3ba88cb7eb1b
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 #include "SDL.h"
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25 #include "SDL_events.h"
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26 #include "../../events/SDL_events_c.h"
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27 #include "SDL_x11video.h"
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28
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29 /* From the X server sources... */
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30 #define MAX_GAMMA 10.0
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31 #define MIN_GAMMA (1.0/MAX_GAMMA)
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32
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33 static int
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34 X11_SetGammaNoLock (_THIS, float red, float green, float blue)
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35 {
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36 #if SDL_VIDEO_DRIVER_X11_VIDMODE
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37 if (use_vidmode >= 200) {
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38 SDL_NAME (XF86VidModeGamma) gamma;
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39 Bool succeeded;
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40
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41 /* Clamp the gamma values */
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42 if (red < MIN_GAMMA) {
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43 gamma.red = MIN_GAMMA;
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44 } else if (red > MAX_GAMMA) {
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45 gamma.red = MAX_GAMMA;
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46 } else {
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47 gamma.red = red;
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48 }
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49 if (green < MIN_GAMMA) {
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50 gamma.green = MIN_GAMMA;
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51 } else if (green > MAX_GAMMA) {
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52 gamma.green = MAX_GAMMA;
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53 } else {
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54 gamma.green = green;
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55 }
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56 if (blue < MIN_GAMMA) {
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57 gamma.blue = MIN_GAMMA;
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58 } else if (blue > MAX_GAMMA) {
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59 gamma.blue = MAX_GAMMA;
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60 } else {
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61 gamma.blue = blue;
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62 }
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63 if (SDL_GetAppState () & SDL_APPACTIVE) {
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64 succeeded =
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65 SDL_NAME (XF86VidModeSetGamma) (SDL_Display, SDL_Screen,
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66 &gamma);
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67 XSync (SDL_Display, False);
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68 } else {
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69 gamma_saved[0] = gamma.red;
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70 gamma_saved[1] = gamma.green;
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71 gamma_saved[2] = gamma.blue;
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72 succeeded = True;
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73 }
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74 if (succeeded) {
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75 ++gamma_changed;
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76 }
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77 return succeeded ? 0 : -1;
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78 }
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79 #endif
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80 SDL_SetError ("Gamma correction not supported");
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81 return -1;
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82 }
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83
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84 int
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85 X11_SetVidModeGamma (_THIS, float red, float green, float blue)
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86 {
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87 int result;
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88
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89 SDL_Lock_EventThread ();
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90 result = X11_SetGammaNoLock (this, red, green, blue);
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91 SDL_Unlock_EventThread ();
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92
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93 return (result);
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94 }
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95
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96 static int
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97 X11_GetGammaNoLock (_THIS, float *red, float *green, float *blue)
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98 {
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99 #if SDL_VIDEO_DRIVER_X11_VIDMODE
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100 if (use_vidmode >= 200) {
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101 SDL_NAME (XF86VidModeGamma) gamma;
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102 if (SDL_NAME (XF86VidModeGetGamma)
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103 (SDL_Display, SDL_Screen, &gamma)) {
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104 *red = gamma.red;
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105 *green = gamma.green;
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106 *blue = gamma.blue;
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107 return 0;
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108 }
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109 return -1;
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110 }
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111 #endif
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112 return -1;
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113 }
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114
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115 int
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116 X11_GetVidModeGamma (_THIS, float *red, float *green, float *blue)
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117 {
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118 int result;
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119
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120 SDL_Lock_EventThread ();
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121 result = X11_GetGammaNoLock (this, red, green, blue);
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122 SDL_Unlock_EventThread ();
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123
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124 return (result);
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125 }
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126
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127 void
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128 X11_SaveVidModeGamma (_THIS)
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129 {
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130 /* Try to save the current gamma, otherwise disable gamma control */
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131 if (X11_GetGammaNoLock (this,
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132 &gamma_saved[0], &gamma_saved[1],
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133 &gamma_saved[2]) < 0) {
0
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134 this->SetGamma = 0;
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135 this->GetGamma = 0;
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136 }
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137 gamma_changed = 0;
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138 }
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139
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140 void
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141 X11_SwapVidModeGamma (_THIS)
0
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142 {
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143 float new_gamma[3];
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144
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145 if (gamma_changed) {
0
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146 new_gamma[0] = gamma_saved[0];
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147 new_gamma[1] = gamma_saved[1];
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148 new_gamma[2] = gamma_saved[2];
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149 X11_GetGammaNoLock (this, &gamma_saved[0], &gamma_saved[1],
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150 &gamma_saved[2]);
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151 X11_SetGammaNoLock (this, new_gamma[0], new_gamma[1], new_gamma[2]);
0
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152 }
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153 }
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154
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155 /* vi: set ts=4 sw=4 expandtab: */