annotate src/video/x11/SDL_x11gamma.c @ 1882:339d733e3699

Fixed bug #258 Account for the menu height in AdjustWindowRectEx()
author Sam Lantinga <slouken@libsdl.org>
date Sat, 24 Jun 2006 04:30:01 +0000
parents 3ba88cb7eb1b
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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 X11_SetGammaNoLock(_THIS, float red, float green, float blue)
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34 {
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35 #if SDL_VIDEO_DRIVER_X11_VIDMODE
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36 if (use_vidmode >= 200) {
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37 SDL_NAME(XF86VidModeGamma) gamma;
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38 Bool succeeded;
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39
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40 /* Clamp the gamma values */
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41 if ( red < MIN_GAMMA ) {
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42 gamma.red = MIN_GAMMA;
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43 } else
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44 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
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52 if ( green > MAX_GAMMA ) {
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53 gamma.green = MAX_GAMMA;
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54 } else {
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55 gamma.green = green;
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56 }
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57 if ( blue < MIN_GAMMA ) {
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58 gamma.blue = MIN_GAMMA;
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59 } else
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60 if ( blue > MAX_GAMMA ) {
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61 gamma.blue = MAX_GAMMA;
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62 } else {
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63 gamma.blue = blue;
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64 }
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65 if ( SDL_GetAppState() & SDL_APPACTIVE ) {
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66 succeeded = SDL_NAME(XF86VidModeSetGamma)(SDL_Display, SDL_Screen, &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 int X11_SetVidModeGamma(_THIS, float red, float green, float blue)
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84 {
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85 int result;
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86
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87 SDL_Lock_EventThread();
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88 result = X11_SetGammaNoLock(this, red, green, blue);
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89 SDL_Unlock_EventThread();
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90
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91 return(result);
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92 }
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93
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94 static int X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue)
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95 {
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96 #if SDL_VIDEO_DRIVER_X11_VIDMODE
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97 if (use_vidmode >= 200) {
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98 SDL_NAME(XF86VidModeGamma) gamma;
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99 if (SDL_NAME(XF86VidModeGetGamma)(SDL_Display, SDL_Screen, &gamma)) {
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100 *red = gamma.red;
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101 *green = gamma.green;
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102 *blue = gamma.blue;
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103 return 0;
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104 }
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105 return -1;
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106 }
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107 #endif
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108 return -1;
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109 }
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110 int X11_GetVidModeGamma(_THIS, float *red, float *green, float *blue)
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111 {
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112 int result;
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113
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114 SDL_Lock_EventThread();
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115 result = X11_GetGammaNoLock(this, red, green, blue);
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116 SDL_Unlock_EventThread();
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117
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118 return(result);
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119 }
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120
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121 void X11_SaveVidModeGamma(_THIS)
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122 {
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123 /* Try to save the current gamma, otherwise disable gamma control */
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124 if ( X11_GetGammaNoLock(this,
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125 &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]) < 0 ) {
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126 this->SetGamma = 0;
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127 this->GetGamma = 0;
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128 }
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129 gamma_changed = 0;
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130 }
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131 void X11_SwapVidModeGamma(_THIS)
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132 {
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133 float new_gamma[3];
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134
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135 if ( gamma_changed ) {
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136 new_gamma[0] = gamma_saved[0];
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137 new_gamma[1] = gamma_saved[1];
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138 new_gamma[2] = gamma_saved[2];
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139 X11_GetGammaNoLock(this, &gamma_saved[0], &gamma_saved[1], &gamma_saved[2]);
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140 X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]);
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141 }
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142 }