Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gamma.c @ 1946:103760c3a5dc
Added the dummy audio driver to instructions
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 26 Jul 2006 03:57:45 +0000 |
| parents | c121d94672cb |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #include "SDL.h" | |
| 25 #include "SDL_events.h" | |
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26 #include "../../events/SDL_events_c.h" |
| 0 | 27 #include "SDL_x11video.h" |
| 28 | |
| 29 /* From the X server sources... */ | |
| 30 #define MAX_GAMMA 10.0 | |
| 31 #define MIN_GAMMA (1.0/MAX_GAMMA) | |
| 32 | |
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33 static int |
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34 X11_SetGammaNoLock(_THIS, float red, float green, float blue) |
| 0 | 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; |
| 0 | 39 Bool succeeded; |
| 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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parents:
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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); |
| 0 | 68 } else { |
| 69 gamma_saved[0] = gamma.red; | |
| 70 gamma_saved[1] = gamma.green; | |
| 71 gamma_saved[2] = gamma.blue; | |
| 72 succeeded = True; | |
| 73 } | |
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74 if (succeeded) { |
| 0 | 75 ++gamma_changed; |
| 76 } | |
| 77 return succeeded ? 0 : -1; | |
| 78 } | |
| 79 #endif | |
| 80 SDL_SetError("Gamma correction not supported"); | |
| 81 return -1; | |
| 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) |
| 0 | 86 { |
| 87 int result; | |
| 88 | |
| 89 SDL_Lock_EventThread(); | |
| 90 result = X11_SetGammaNoLock(this, red, green, blue); | |
| 91 SDL_Unlock_EventThread(); | |
| 92 | |
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93 return (result); |
| 0 | 94 } |
| 95 | |
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96 static int |
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97 X11_GetGammaNoLock(_THIS, float *red, float *green, float *blue) |
| 0 | 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; |
| 0 | 105 *green = gamma.green; |
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106 *blue = gamma.blue; |
| 0 | 107 return 0; |
| 108 } | |
| 109 return -1; | |
| 110 } | |
| 111 #endif | |
| 112 return -1; | |
| 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) |
| 0 | 117 { |
| 118 int result; | |
| 119 | |
| 120 SDL_Lock_EventThread(); | |
| 121 result = X11_GetGammaNoLock(this, red, green, blue); | |
| 122 SDL_Unlock_EventThread(); | |
| 123 | |
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124 return (result); |
| 0 | 125 } |
| 126 | |
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127 void |
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128 X11_SaveVidModeGamma(_THIS) |
| 0 | 129 { |
| 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 | 134 this->SetGamma = 0; |
| 135 this->GetGamma = 0; | |
| 136 } | |
| 137 gamma_changed = 0; | |
| 138 } | |
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139 |
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140 void |
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141 X11_SwapVidModeGamma(_THIS) |
| 0 | 142 { |
| 143 float new_gamma[3]; | |
| 144 | |
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145 if (gamma_changed) { |
| 0 | 146 new_gamma[0] = gamma_saved[0]; |
| 147 new_gamma[1] = gamma_saved[1]; | |
| 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]); |
| 0 | 151 X11_SetGammaNoLock(this, new_gamma[0], new_gamma[1], new_gamma[2]); |
| 152 } | |
| 153 } | |
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154 |
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155 /* vi: set ts=4 sw=4 expandtab: */ |