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annotate src/video/win32/SDL_win32modes.c @ 1725:98a3207ddde8 SDL-1.3

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Implemented Win32 video mode support
author Sam Lantinga <slouken@libsdl.org>
date Fri, 07 Jul 2006 08:05:39 +0000
parents
children 0b1070f2f94d
rev   line source
1725
98a3207ddde8 Implemented Win32 video mode support
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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_win32video.h"
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25
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26
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27 typedef struct
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28 {
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29 TCHAR DeviceName[32];
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30 DEVMODE DeviceMode;
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31 } SDL_DisplayModeData;
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32
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33 /* FIXME: Each call to EnumDisplaySettings() takes about 6 ms on my laptop.
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34 With 500 or so modes, this takes almost 3 seconds to run!
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35 */
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36
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37 static SDL_bool
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38 WIN_GetDisplayMode(LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
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39 {
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40 SDL_DisplayModeData *data;
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41 DEVMODE devmode;
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42 HDC hdc;
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43
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44 devmode.dmSize = sizeof(devmode);
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45 devmode.dmDriverExtra = 0;
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46 if (!EnumDisplaySettings(deviceName, index, &devmode)) {
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47 return SDL_FALSE;
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48 }
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49
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50 data = (SDL_DisplayModeData *) SDL_malloc(sizeof(*data));
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51 if (!data) {
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52 return SDL_FALSE;
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53 }
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54 SDL_memcpy(data->DeviceName, deviceName, sizeof(data->DeviceName));
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55 data->DeviceMode = devmode;
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56 data->DeviceMode.dmFields =
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57 (DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY |
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58 DM_DISPLAYFLAGS);
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59
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60 /* Fill in the mode information */
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61 mode->format = SDL_PixelFormat_Unknown;
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62 mode->w = devmode.dmPelsWidth;
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63 mode->h = devmode.dmPelsHeight;
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64 mode->refresh_rate = devmode.dmDisplayFrequency;
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65 mode->driverdata = data;
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66
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67 hdc = CreateDC(deviceName, NULL, NULL, &devmode);
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68 if (hdc) {
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69 char bmi_data[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];
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70 LPBITMAPINFO bmi;
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71 HBITMAP hbm;
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72
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73 SDL_zero(bmi_data);
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74 bmi = (LPBITMAPINFO) bmi_data;
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75 bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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76
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77 hbm = CreateCompatibleBitmap(hdc, 1, 1);
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78 GetDIBits(hdc, hbm, 0, 1, NULL, bmi, DIB_RGB_COLORS);
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79 GetDIBits(hdc, hbm, 0, 1, NULL, bmi, DIB_RGB_COLORS);
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80 DeleteObject(hbm);
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81 DeleteDC(hdc);
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82 if (bmi->bmiHeader.biCompression == BI_BITFIELDS) {
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83 switch (*(Uint32 *) bmi->bmiColors) {
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84 case 0x00FF0000:
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85 mode->format = SDL_PixelFormat_RGB888;
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86 break;
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87 case 0x000000FF:
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88 mode->format = SDL_PixelFormat_BGR888;
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89 break;
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90 case 0xF800:
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91 mode->format = SDL_PixelFormat_RGB565;
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92 break;
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93 case 0x7C00:
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94 mode->format = SDL_PixelFormat_RGB555;
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95 break;
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96 }
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97 } else if (bmi->bmiHeader.biBitCount == 8) {
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98 mode->format = SDL_PixelFormat_Index8;
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99 }
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100 } else {
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101 switch (devmode.dmBitsPerPel) {
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102 case 32:
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103 mode->format = SDL_PixelFormat_RGB888;
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104 break;
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105 case 24:
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106 mode->format = SDL_PixelFormat_RGB24;
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107 break;
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108 case 16:
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109 mode->format = SDL_PixelFormat_RGB565;
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110 break;
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111 case 15:
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112 mode->format = SDL_PixelFormat_RGB555;
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113 break;
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114 case 8:
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115 mode->format = SDL_PixelFormat_Index8;
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116 break;
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117 }
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118 }
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119 return SDL_TRUE;
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120 }
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121
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122 void
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123 WIN_InitModes(_THIS)
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124 {
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125 SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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126 DWORD i, j, k;
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127 DISPLAY_DEVICE device;
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128
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129 device.cb = sizeof(device);
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130 for (i = 0;; ++i) {
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131 TCHAR DeviceName[32];
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132
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133 if (!EnumDisplayDevices(NULL, i, &device, 0)) {
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134 break;
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135 }
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136 if (!(device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)) {
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137 continue;
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138 }
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139 SDL_memcpy(DeviceName, device.DeviceName, sizeof(DeviceName));
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140 #ifdef DEBUG_MODES
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141 printf("Device: %s\n", WIN_StringToUTF8(DeviceName));
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142 #endif
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143 for (j = 0;; ++j) {
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144 int index;
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145 SDL_VideoDisplay display;
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146 SDL_DisplayMode mode;
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147
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148 if (!EnumDisplayDevices(DeviceName, j, &device, 0)) {
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149 break;
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150 }
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151 if (!(device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)) {
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152 continue;
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153 }
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154 #ifdef DEBUG_MODES
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155 printf("Monitor: %s\n", WIN_StringToUTF8(device.DeviceName));
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156 #endif
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157 if (!WIN_GetDisplayMode(DeviceName, ENUM_CURRENT_SETTINGS, &mode)) {
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158 break;
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159 }
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160 SDL_zero(display);
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161 display.desktop_mode = mode;
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162 display.current_mode = mode;
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163 index = SDL_AddVideoDisplay(&display);
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164
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165 for (k = 0;; ++k) {
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166 if (!WIN_GetDisplayMode(DeviceName, k, &mode)) {
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167 break;
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168 }
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169 if (!SDL_AddDisplayMode(index, &mode)) {
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170 SDL_free(mode.driverdata);
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171 }
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172 }
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173 }
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174 }
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175 }
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176
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177 int
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178 WIN_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
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179 {
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180 SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
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181 LONG status;
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182
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183 status =
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184 ChangeDisplaySettingsEx(data->DeviceName, &data->DeviceMode, NULL,
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185 CDS_FULLSCREEN, NULL);
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186 if (status == DISP_CHANGE_SUCCESSFUL) {
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187 return 0;
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188 } else {
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189 const char *reason = "Unknown reason";
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190 switch (status) {
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191 case DISP_CHANGE_BADFLAGS:
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192 reason = "DISP_CHANGE_BADFLAGS";
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193 break;
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194 case DISP_CHANGE_BADMODE:
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195 reason = "DISP_CHANGE_BADMODE";
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196 break;
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197 case DISP_CHANGE_BADPARAM:
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198 reason = "DISP_CHANGE_BADPARAM";
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199 break;
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200 case DISP_CHANGE_FAILED:
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201 reason = "DISP_CHANGE_FAILED";
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202 break;
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203 }
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204 SDL_SetError("ChangeDisplaySettingsEx() failed: %s", reason);
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205 return -1;
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206 }
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207 }
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208
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209 void
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210 WIN_QuitModes(_THIS)
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211 {
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212 ChangeDisplaySettingsEx(NULL, NULL, NULL, 0, NULL);
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213 }
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214
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215 /* vi: set ts=4 sw=4 expandtab: */