SDL_windowsmodes.c

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Author : Sam Lantinga
Date : 2014-05-31 12:21:55
Hash : 70df9cd0
Message : Fullscreen to windowed mode switch From Melesie I noticed that when user switches from fullscreen mode to windowed mode and exits application while in windowed mode, Windows performs an additional change of display settings, even though desktop resolution is the same as current one. This causes short black screen to show up. The only way I know of avoiding this is to explicitly switch to default display settings found in registry. MSDN documentation for ChangeDisplaySettingsEx states: Passing NULL for the lpDevMode parameter and 0 for the dwFlags parameter is the easiest way to return to the default mode after a dynamic mode change.
src/video/windows/SDL_windowsmodes.c
/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"

#if SDL_VIDEO_DRIVER_WINDOWS

#include "SDL_windowsvideo.h"

/* Windows CE compatibility */
#ifndef CDS_FULLSCREEN
#define CDS_FULLSCREEN 0
#endif

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;
    }
    data->DeviceMode = devmode;
    data->DeviceMode.dmFields =
        (DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM_DISPLAYFREQUENCY |
         DM_DISPLAYFLAGS);
	data->ScaleX = 1.0f;
	data->ScaleY = 1.0f;

    /* 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;

    if (index == ENUM_CURRENT_SETTINGS
        && (hdc = CreateDC(deviceName, NULL, NULL, NULL)) != NULL) {
        char bmi_data[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];
        LPBITMAPINFO bmi;
        HBITMAP hbm;
		int logical_width = GetDeviceCaps( hdc, HORZRES );
		int logical_height = GetDeviceCaps( hdc, VERTRES );

		data->ScaleX = (float)logical_width / devmode.dmPelsWidth;
		data->ScaleY = (float)logical_height / devmode.dmPelsHeight;
		mode->w = logical_width;
		mode->h = logical_height;

        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 if (bmi->bmiHeader.biBitCount == 4) {
            mode->format = SDL_PIXELFORMAT_INDEX4LSB;
        }
	} else {
        /* FIXME: Can we tell what this will be? */
        if ((devmode.dmFields & DM_BITSPERPEL) == DM_BITSPERPEL) {
            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;
            case 4:
                mode->format = SDL_PIXELFORMAT_INDEX4LSB;
                break;
            }
        }
    }
    return SDL_TRUE;
}

static SDL_bool
WIN_AddDisplay(LPTSTR DeviceName)
{
    SDL_VideoDisplay display;
    SDL_DisplayData *displaydata;
    SDL_DisplayMode mode;
    DISPLAY_DEVICE device;

#ifdef DEBUG_MODES
    printf("Display: %s\n", WIN_StringToUTF8(DeviceName));
#endif
    if (!WIN_GetDisplayMode(DeviceName, ENUM_CURRENT_SETTINGS, &mode)) {
        return SDL_FALSE;
    }

    displaydata = (SDL_DisplayData *) SDL_malloc(sizeof(*displaydata));
    if (!displaydata) {
        return SDL_FALSE;
    }
    SDL_memcpy(displaydata->DeviceName, DeviceName,
               sizeof(displaydata->DeviceName));

    SDL_zero(display);
    device.cb = sizeof(device);
    if (EnumDisplayDevices(DeviceName, 0, &device, 0)) {
        display.name = WIN_StringToUTF8(device.DeviceString);
    }
    display.desktop_mode = mode;
    display.current_mode = mode;
    display.driverdata = displaydata;
    SDL_AddVideoDisplay(&display);
    SDL_free(display.name);
    return SDL_TRUE;
}

int
WIN_InitModes(_THIS)
{
    int pass;
    DWORD i, j, count;
    DISPLAY_DEVICE device;

    device.cb = sizeof(device);

    /* Get the primary display in the first pass */
    for (pass = 0; pass < 2; ++pass) {
        for (i = 0; ; ++i) {
            TCHAR DeviceName[32];

            if (!EnumDisplayDevices(NULL, i, &device, 0)) {
                break;
            }
            if (!(device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)) {
                continue;
            }
            if (pass == 0) {
                if (!(device.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE)) {
                    continue;
                }
            } else {
                if (device.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) {
                    continue;
                }
            }
            SDL_memcpy(DeviceName, device.DeviceName, sizeof(DeviceName));
#ifdef DEBUG_MODES
            printf("Device: %s\n", WIN_StringToUTF8(DeviceName));
#endif
            count = 0;
            for (j = 0; ; ++j) {
                if (!EnumDisplayDevices(DeviceName, j, &device, 0)) {
                    break;
                }
                if (!(device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)) {
                    continue;
                }
                if (pass == 0) {
                    if (!(device.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE)) {
                        continue;
                    }
                } else {
                    if (device.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) {
                        continue;
                    }
                }
                count += WIN_AddDisplay(device.DeviceName);
            }
            if (count == 0) {
                WIN_AddDisplay(DeviceName);
            }
        }
    }
    if (_this->num_displays == 0) {
        return SDL_SetError("No displays available");
    }
    return 0;
}

int
WIN_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
{
    SDL_DisplayModeData *data = (SDL_DisplayModeData *) display->current_mode.driverdata;

    rect->x = (int)SDL_ceil(data->DeviceMode.dmPosition.x * data->ScaleX);
    rect->y = (int)SDL_ceil(data->DeviceMode.dmPosition.y * data->ScaleY);
    rect->w = (int)SDL_ceil(data->DeviceMode.dmPelsWidth * data->ScaleX);
    rect->h = (int)SDL_ceil(data->DeviceMode.dmPelsHeight * data->ScaleY);

    return 0;
}

void
WIN_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
{
    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
    DWORD i;
    SDL_DisplayMode mode;

    for (i = 0;; ++i) {
        if (!WIN_GetDisplayMode(data->DeviceName, i, &mode)) {
            break;
        }
        if (SDL_ISPIXELFORMAT_INDEXED(mode.format)) {
            /* We don't support palettized modes now */
            SDL_free(mode.driverdata);
            continue;
        }
        if (mode.format != SDL_PIXELFORMAT_UNKNOWN) {
            if (!SDL_AddDisplayMode(display, &mode)) {
                SDL_free(mode.driverdata);
            }
        } else {
            SDL_free(mode.driverdata);
        }
    }
}

int
WIN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
{
    SDL_DisplayData *displaydata = (SDL_DisplayData *) display->driverdata;
    SDL_DisplayModeData *data = (SDL_DisplayModeData *) mode->driverdata;
    LONG status;

    if (mode->driverdata == display->desktop_mode.driverdata) {
        status = ChangeDisplaySettingsEx(displaydata->DeviceName, NULL, NULL, 0, NULL);
    } else {
        status = ChangeDisplaySettingsEx(displaydata->DeviceName, &data->DeviceMode, NULL, CDS_FULLSCREEN, NULL);
    }
    if (status != DISP_CHANGE_SUCCESSFUL) {
        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;
        }
        return SDL_SetError("ChangeDisplaySettingsEx() failed: %s", reason);
    }
    EnumDisplaySettings(displaydata->DeviceName, ENUM_CURRENT_SETTINGS, &data->DeviceMode);
    return 0;
}

void
WIN_QuitModes(_THIS)
{
    /* All fullscreen windows should have restored modes by now */
}

#endif /* SDL_VIDEO_DRIVER_WINDOWS */

/* vi: set ts=4 sw=4 expandtab: */
kc3-lang/SDL/src/video/windows/SDL_windowsmodes.c

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kc3-lang/SDL /src/video/windows/SDL_windowsmodes.c
