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SDL_win32modes.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_win32video.h"
/* FIXME: Each call to EnumDisplaySettings() takes about 6 ms on my laptop.
With 500 or so modes, this takes almost 3 seconds to run!
*/
static SDL_bool
WIN_GetDisplayMode(LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
{
SDL_DisplayModeData *data;
DEVMODE devmode;
HDC hdc;
devmode.dmSize = sizeof(devmode);
devmode.dmDriverExtra = 0;
if (!EnumDisplaySettings(deviceName, index, &devmode)) {
return SDL_FALSE;
}
data = (SDL_DisplayModeData *) SDL_malloc(sizeof(*data));
if (!data) {
return SDL_FALSE;
}
SDL_memcpy(data->DeviceName, deviceName, sizeof(data->DeviceName));
data->DeviceMode = devmode;
data->DeviceMode.dmFields =
(DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY |
DM_DISPLAYFLAGS);
/* Fill in the mode information */
mode->format = SDL_PixelFormat_Unknown;
mode->w = devmode.dmPelsWidth;
mode->h = devmode.dmPelsHeight;
mode->refresh_rate = devmode.dmDisplayFrequency;
mode->driverdata = data;
hdc = CreateDC(deviceName, NULL, NULL, &devmode);
if (hdc) {
char bmi_data[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];
LPBITMAPINFO bmi;
HBITMAP hbm;
SDL_zero(bmi_data);
bmi = (LPBITMAPINFO) bmi_data;
bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
hbm = CreateCompatibleBitmap(hdc, 1, 1);
GetDIBits(hdc, hbm, 0, 1, NULL, bmi, DIB_RGB_COLORS);
GetDIBits(hdc, hbm, 0, 1, NULL, bmi, DIB_RGB_COLORS);
DeleteObject(hbm);
DeleteDC(hdc);
if (bmi->bmiHeader.biCompression == BI_BITFIELDS) {
switch (*(Uint32 *) bmi->bmiColors) {
case 0x00FF0000:
mode->format = SDL_PixelFormat_RGB888;
break;
case 0x000000FF:
mode->format = SDL_PixelFormat_BGR888;
break;
case 0xF800:
mode->format = SDL_PixelFormat_RGB565;
break;
case 0x7C00:
mode->format = SDL_PixelFormat_RGB555;
break;
}
} else if (bmi->bmiHeader.biBitCount == 8) {
mode->format = SDL_PixelFormat_Index8;
}
} else {
switch (devmode.dmBitsPerPel) {
case 32:
mode->format = SDL_PixelFormat_RGB888;
break;
case 24:
mode->format = SDL_PixelFormat_RGB24;
break;
case 16:
mode->format = SDL_PixelFormat_RGB565;
break;
case 15:
mode->format = SDL_PixelFormat_RGB555;
break;
case 8:
mode->format = SDL_PixelFormat_Index8;
break;
}
}
return SDL_TRUE;
}
void
WIN_InitModes(_THIS)
{
SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
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DWORD i, j;
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DISPLAY_DEVICE device;
device.cb = sizeof(device);
for (i = 0;; ++i) {
TCHAR DeviceName[32];
if (!EnumDisplayDevices(NULL, i, &device, 0)) {
break;
}
if (!(device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)) {
continue;
}
SDL_memcpy(DeviceName, device.DeviceName, sizeof(DeviceName));
#ifdef DEBUG_MODES
printf("Device: %s\n", WIN_StringToUTF8(DeviceName));
#endif
for (j = 0;; ++j) {
int index;
SDL_VideoDisplay display;
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SDL_DisplayData *displaydata;
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SDL_DisplayMode mode;
if (!EnumDisplayDevices(DeviceName, j, &device, 0)) {
break;
}
if (!(device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)) {
continue;
}
#ifdef DEBUG_MODES
printf("Monitor: %s\n", WIN_StringToUTF8(device.DeviceName));
#endif
if (!WIN_GetDisplayMode(DeviceName, ENUM_CURRENT_SETTINGS, &mode)) {
break;
}
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displaydata =
(SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
if (!displaydata) {
continue;
}
SDL_memcpy(displaydata->DeviceName, DeviceName,
sizeof(DeviceName));
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SDL_zero(display);
display.desktop_mode = mode;
display.current_mode = mode;
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display.driverdata = displaydata;
SDL_AddVideoDisplay(&display);
}
}
}
void
WIN_GetDisplayModes(_THIS)
{
SDL_DisplayData *data = (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;
DWORD i;
SDL_DisplayMode mode;
for (i = 0;; ++i) {
if (!WIN_GetDisplayMode(data->DeviceName, i, &mode)) {
break;
}
if (!SDL_AddDisplayMode(_this->current_display, &mode)) {
SDL_free(mode.driverdata);
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}
}
}
int
WIN_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
{
SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
LONG status;
status =
ChangeDisplaySettingsEx(data->DeviceName, &data->DeviceMode, NULL,
CDS_FULLSCREEN, NULL);
if (status == DISP_CHANGE_SUCCESSFUL) {
return 0;
} else {
const char *reason = "Unknown reason";
switch (status) {
case DISP_CHANGE_BADFLAGS:
reason = "DISP_CHANGE_BADFLAGS";
break;
case DISP_CHANGE_BADMODE:
reason = "DISP_CHANGE_BADMODE";
break;
case DISP_CHANGE_BADPARAM:
reason = "DISP_CHANGE_BADPARAM";
break;
case DISP_CHANGE_FAILED:
reason = "DISP_CHANGE_FAILED";
break;
}
SDL_SetError("ChangeDisplaySettingsEx() failed: %s", reason);
return -1;
}
}
void
WIN_QuitModes(_THIS)
{
ChangeDisplaySettingsEx(NULL, NULL, NULL, 0, NULL);
}
/* vi: set ts=4 sw=4 expandtab: */