/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2011 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_config.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;
#ifndef _WIN32_WCE
    HDC hdc;
#endif

    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);

    /* 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;
#ifdef _WIN32_WCE
    /* In WinCE EnumDisplaySettings(ENUM_CURRENT_SETTINGS) doesn't take the user defined orientation
       into account but GetSystemMetrics does. */
    if (index == ENUM_CURRENT_SETTINGS) {
        mode->w = GetSystemMetrics(SM_CXSCREEN);
        mode->h = GetSystemMetrics(SM_CYSCREEN);
    }
#endif

/* WinCE has no GetDIBits, therefore we can't use it to get the display format */
#ifndef _WIN32_WCE
    if (index == ENUM_CURRENT_SETTINGS
        && (hdc = CreateDC(deviceName, NULL, NULL, NULL)) != NULL) {
        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 if (bmi->bmiHeader.biBitCount == 4) {
            mode->format = SDL_PIXELFORMAT_INDEX4LSB;
        }
    } else
#endif /* _WIN32_WCE */
    {
        /* 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;

#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);
    display.desktop_mode = mode;
    display.current_mode = mode;
    display.driverdata = displaydata;
    SDL_AddVideoDisplay(&display);
    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) {
        SDL_SetError("No displays available");
        return -1;
    }
    return 0;
}

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

#ifdef _WIN32_WCE
    // WINCE: DEVMODE.dmPosition not found, or may be mingw32ce bug
    rect->x = 0;
    rect->y = 0;
    rect->w = _this->windows->w;
    rect->h = _this->windows->h;
#else
    rect->x = (int)data->DeviceMode.dmPosition.x;
    rect->y = (int)data->DeviceMode.dmPosition.y;
    rect->w = data->DeviceMode.dmPelsWidth;
    rect->h = data->DeviceMode.dmPelsHeight;
#endif
    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 */
            continue;
        }
        if (mode.format != SDL_PIXELFORMAT_UNKNOWN) {
            if (!SDL_AddDisplayMode(display, &mode)) {
                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;

#ifdef _WIN32_WCE
    /* TODO: implement correctly.
       On my Asus MyPAL, if I execute the code below
       I get DISP_CHANGE_BADFLAGS and the Titlebar of the fullscreen window stays
       visible ... (SDL_RaiseWindow() would fix that one) */
    return 0;
#endif

    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;
        }
        SDL_SetError("ChangeDisplaySettingsEx() failed: %s", reason);
        return -1;
    }
    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: */