/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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"

/* Pocket PC GAPI SDL video driver implementation;
Implemented by Dmitry Yakimov - support@activekitten.com
Inspired by http://arisme.free.fr/ports/SDL.php
*/

// TODO: copy surface on window when lost focus
// TODO: test buttons rotation
// TODO: test on be300 and HPC ( check WinDib fullscreen keys catching )
// TODO: test on smartphones
// TODO: windib on SH3 PPC2000 landscape test
// TODO: optimize 8bpp landscape mode

// there is some problems in runnings apps from a device landscape mode
// due to WinCE bugs. Some works and some - does not.
// TODO: finish Axim Dell X30 and user landscape mode, device landscape mode
// TODO: finish Axim Dell X30 user portrait, device landscape stylus conversion
// TODO: fix running GAPI apps from landscape mode - 
//       wince goes to portrait mode, but does not update video memory


#include "SDL.h"
#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_mouse.h"
#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../../events/SDL_events_c.h"
#include "../wincommon/SDL_syswm_c.h"
#include "../wincommon/SDL_sysmouse_c.h"
#include "../windib/SDL_dibevents_c.h"

#include "SDL_gapivideo.h"

#define GAPIVID_DRIVER_NAME "gapi"

#if defined(DEBUG) || defined (_DEBUG) || defined(NDEBUG)
#define REPORT_VIDEO_INFO 1
#else
#define REPORT_VIDEO_INFO 0
#endif

// for testing with GapiEmu
#define USE_GAPI_EMU 0
#define EMULATE_AXIM_X30 0
#define WITHOUT_GAPI 0

#if USE_GAPI_EMU && !REPORT_VIDEO_INFO
#pragma message("Warning: Using GapiEmu in release build. I assume you'd like to set USE_GAPI_EMU to zero.")
#endif

// defined and used in SDL_sysevents.c
extern HINSTANCE aygshell;
extern void SDL_UnregisterApp();
extern int DIB_AddMode(_THIS, int bpp, int w, int h);

/* Initialization/Query functions */
static int GAPI_VideoInit(_THIS, SDL_PixelFormat * vformat);
static SDL_Rect **GAPI_ListModes(_THIS, SDL_PixelFormat * format,
                                 Uint32 flags);
static SDL_Surface *GAPI_SetVideoMode(_THIS, SDL_Surface * current,
                                      int width, int height, int bpp,
                                      Uint32 flags);
static int GAPI_SetColors(_THIS, int firstcolor, int ncolors,
                          SDL_Color * colors);
static void GAPI_VideoQuit(_THIS);

/* Hardware surface functions */
static int GAPI_AllocHWSurface(_THIS, SDL_Surface * surface);
static int GAPI_LockHWSurface(_THIS, SDL_Surface * surface);
static void GAPI_UnlockHWSurface(_THIS, SDL_Surface * surface);
static void GAPI_FreeHWSurface(_THIS, SDL_Surface * surface);

/* Windows message handling functions, will not be processed */
static void GAPI_RealizePalette(_THIS);
static void GAPI_PaletteChanged(_THIS, HWND window);
static void GAPI_WinPAINT(_THIS, HDC hdc);

/* etc. */
static void GAPI_UpdateRects(_THIS, int numrects, SDL_Rect * rects);

static HMODULE g_hGapiLib = 0;
#define LINK(type,name,import) \
	if( g_hGapiLib ) \
		name = (PFN##type)GetProcAddress( g_hGapiLib, _T(import) );

static char g_bRawBufferAvailable = 0;

/* GAPI driver bootstrap functions */

/* hi res definitions */
typedef struct _RawFrameBufferInfo
{
    WORD wFormat;
    WORD wBPP;
    VOID *pFramePointer;
    int cxStride;
    int cyStride;
    int cxPixels;
    int cyPixels;
} RawFrameBufferInfo;

static struct _RawFrameBufferInfo g_RawFrameBufferInfo = { 0 };

#define GETRAWFRAMEBUFFER   0x00020001

#define FORMAT_565 1
#define FORMAT_555 2
#define FORMAT_OTHER 3

/* Dell Axim x30 hangs when we use GAPI from landscape,
   so lets avoid using GxOpenDisplay there via GETGXINFO trick 
   It seems that GAPI subsystem use the same ExtEscape code.
*/
#define GETGXINFO 0x00020000

typedef struct GXDeviceInfo
{
    long Version;               //00 (should filled with 100 before calling ExtEscape)
    void *pvFrameBuffer;        //04
    unsigned long cbStride;     //08
    unsigned long cxWidth;      //0c
    unsigned long cyHeight;     //10
    unsigned long cBPP;         //14
    unsigned long ffFormat;     //18
    char Unused[0x84 - 7 * 4];
} GXDeviceInfo;

static int
GAPI_Available(void)
{
    // try to use VGA display, even on emulator
    HDC hdc = GetDC(NULL);
    int result = ExtEscape(hdc, GETRAWFRAMEBUFFER, 0, NULL,
                           sizeof(RawFrameBufferInfo),
                           (char *) &g_RawFrameBufferInfo);
    ReleaseDC(NULL, hdc);
    g_bRawBufferAvailable = result > 0;

#if WITHOUT_GAPI
    return g_bRawBufferAvailable;
#endif

#if USE_GAPI_EMU
    g_hGapiLib = LoadLibrary(_T("GAPI_Emu.dll"));
    if (!g_hGapiLib) {
        SDL_SetError("Gapi Emu not found!");
    }
    return g_hGapiLib != 0;
#endif

    // try to find gx.dll
    g_hGapiLib = LoadLibrary(_T("\\Windows\\gx.dll"));
    if (!g_hGapiLib) {
        g_hGapiLib = LoadLibrary(_T("gx.dll"));
        if (!g_hGapiLib)
            return g_bRawBufferAvailable;
    }

    return (1);
}

static int
cmpmodes(const void *va, const void *vb)
{
    SDL_Rect *a = *(SDL_Rect **) va;
    SDL_Rect *b = *(SDL_Rect **) vb;
    if (a->w == b->w)
        return b->h - a->h;
    else
        return b->w - a->w;
}

static int
GAPI_AddMode(_THIS, int bpp, int w, int h)
{
    SDL_Rect *mode;
    int i, index;
    int next_mode;

    /* Check to see if we already have this mode */
    if (bpp < 8) {              /* Not supported */
        return (0);
    }
    index = ((bpp + 7) / 8) - 1;
    for (i = 0; i < gapi->SDL_nummodes[index]; ++i) {
        mode = gapi->SDL_modelist[index][i];
        if ((mode->w == w) && (mode->h == h)) {
            return (0);
        }
    }

    /* Set up the new video mode rectangle */
    mode = (SDL_Rect *) SDL_malloc(sizeof *mode);
    if (mode == NULL) {
        SDL_OutOfMemory();
        return (-1);
    }
    mode->x = 0;
    mode->y = 0;
    mode->w = w;
    mode->h = h;

    /* Allocate the new list of modes, and fill in the new mode */
    next_mode = gapi->SDL_nummodes[index];
    gapi->SDL_modelist[index] = (SDL_Rect **)
        SDL_realloc(gapi->SDL_modelist[index],
                    (1 + next_mode + 1) * sizeof(SDL_Rect *));
    if (gapi->SDL_modelist[index] == NULL) {
        SDL_OutOfMemory();
        gapi->SDL_nummodes[index] = 0;
        SDL_free(mode);
        return (-1);
    }
    gapi->SDL_modelist[index][next_mode] = mode;
    gapi->SDL_modelist[index][next_mode + 1] = NULL;
    gapi->SDL_nummodes[index]++;

    return (0);
}

static void
GAPI_DeleteDevice(SDL_VideoDevice * device)
{
    if (g_hGapiLib) {
        FreeLibrary(g_hGapiLib);
        g_hGapiLib = 0;
    }
    SDL_free(device->hidden);
    SDL_free(device);
}

static SDL_VideoDevice *
GAPI_CreateDevice(int devindex)
{
    SDL_VideoDevice *device;

    if (!g_hGapiLib && !g_bRawBufferAvailable) {
        if (!GAPI_Available()) {
            SDL_SetError
                ("GAPI dll is not found and VGA mode is not available!");
            return 0;
        }
    }

    /* Initialize all variables that we clean on shutdown */
    device = (SDL_VideoDevice *) SDL_malloc(sizeof(SDL_VideoDevice));
    if (device) {
        SDL_memset(device, 0, (sizeof *device));
        device->hidden = (struct SDL_PrivateVideoData *)
            SDL_malloc((sizeof *device->hidden));
    }
    if ((device == NULL) || (device->hidden == NULL)) {
        SDL_OutOfMemory();
        if (device) {
            SDL_free(device);
        }
        return (0);
    }
    SDL_memset(device->hidden, 0, (sizeof *device->hidden));

    /* Set the function pointers */
    device->VideoInit = GAPI_VideoInit;
    device->ListModes = GAPI_ListModes;
    device->SetVideoMode = GAPI_SetVideoMode;
    device->UpdateMouse = WIN_UpdateMouse;
    device->CreateYUVOverlay = NULL;
    device->SetColors = GAPI_SetColors;
    device->UpdateRects = GAPI_UpdateRects;
    device->VideoQuit = GAPI_VideoQuit;
    device->AllocHWSurface = GAPI_AllocHWSurface;
    device->CheckHWBlit = NULL;
    device->FillHWRect = NULL;
    device->SetHWColorKey = NULL;
    device->SetHWAlpha = NULL;
    device->LockHWSurface = GAPI_LockHWSurface;
    device->UnlockHWSurface = GAPI_UnlockHWSurface;
    device->FlipHWSurface = NULL;
    device->FreeHWSurface = GAPI_FreeHWSurface;
    device->SetCaption = WIN_SetWMCaption;
    device->SetIcon = WIN_SetWMIcon;
    device->IconifyWindow = WIN_IconifyWindow;
    device->GrabInput = WIN_GrabInput;
    device->GetWMInfo = WIN_GetWMInfo;
    device->FreeWMCursor = WIN_FreeWMCursor;
    device->CreateWMCursor = WIN_CreateWMCursor;
    device->ShowWMCursor = WIN_ShowWMCursor;
    device->WarpWMCursor = WIN_WarpWMCursor;
    device->CheckMouseMode = WIN_CheckMouseMode;
    device->InitOSKeymap = DIB_InitOSKeymap;
    device->PumpEvents = DIB_PumpEvents;

    /* Set up the windows message handling functions */
    WIN_RealizePalette = GAPI_RealizePalette;
    WIN_PaletteChanged = GAPI_PaletteChanged;
    WIN_WinPAINT = GAPI_WinPAINT;
    HandleMessage = DIB_HandleMessage;

    device->free = GAPI_DeleteDevice;

    /* Load gapi library */
#define gx device->hidden->gxFunc

    LINK(GXOpenDisplay, gx.GXOpenDisplay,
         "?GXOpenDisplay@@YAHPAUHWND__@@K@Z") LINK(GXCloseDisplay,
                                                   gx.GXCloseDisplay,
                                                   "?GXCloseDisplay@@YAHXZ")
        LINK(GXBeginDraw, gx.GXBeginDraw,
             "?GXBeginDraw@@YAPAXXZ") LINK(GXEndDraw, gx.GXEndDraw,
                                           "?GXEndDraw@@YAHXZ")
        LINK(GXOpenInput, gx.GXOpenInput,
             "?GXOpenInput@@YAHXZ") LINK(GXCloseInput, gx.GXCloseInput,
                                         "?GXCloseInput@@YAHXZ")
        LINK(GXGetDisplayProperties, gx.GXGetDisplayProperties,
             "?GXGetDisplayProperties@@YA?AUGXDisplayProperties@@XZ")
        LINK(GXGetDefaultKeys, gx.GXGetDefaultKeys,
             "?GXGetDefaultKeys@@YA?AUGXKeyList@@H@Z") LINK(GXSuspend,
                                                            gx.GXSuspend,
                                                            "?GXSuspend@@YAHXZ")
        LINK(GXResume, gx.GXResume, "?GXResume@@YAHXZ") LINK(GXSetViewport,
                                                             gx.GXSetViewport,
                                                             "?GXSetViewport@@YAHKKKK@Z")
        LINK(GXIsDisplayDRAMBuffer, gx.GXIsDisplayDRAMBuffer,
             "?GXIsDisplayDRAMBuffer@@YAHXZ")
        /* wrong gapi.dll */
        if (!gx.GXOpenDisplay) {
        if (g_hGapiLib) {
            FreeLibrary(g_hGapiLib);
            g_hGapiLib = 0;
        }
    }

    if (!gx.GXOpenDisplay && !g_bRawBufferAvailable) {
        SDL_SetError("Error: damaged or unknown gapi.dll!\n");
        GAPI_DeleteDevice(device);
        return 0;
    }

    return device;
}

VideoBootStrap GAPI_bootstrap = {
    GAPIVID_DRIVER_NAME, "WinCE GAPI video driver",
    GAPI_Available, GAPI_CreateDevice
};

static void
FillStructs(_THIS, BOOL useVga)
{
#ifdef _ARM_
    WCHAR oemstr[100];
#endif
    /* fill a device properties */

    if (!useVga) {
        this->hidden->gxProperties =
            this->hidden->gxFunc.GXGetDisplayProperties();
        this->hidden->needUpdate = 1;
        this->hidden->hiresFix = 0;
        this->hidden->useVga = 0;
        this->hidden->useGXOpenDisplay = 1;

#ifdef _ARM_
        /* check some devices and extract addition info */
        SystemParametersInfo(SPI_GETOEMINFO, sizeof(oemstr), oemstr, 0);

        // buggy iPaq38xx
        if ((oemstr[12] == 'H') && (oemstr[13] == '3')
            && (oemstr[14] == '8')
            && (this->hidden->gxProperties.cbxPitch > 0)) {
            this->hidden->videoMem = (PIXEL *) 0xac0755a0;
            this->hidden->gxProperties.cbxPitch = -640;
            this->hidden->gxProperties.cbyPitch = 2;
            this->hidden->needUpdate = 0;
        }
#if (EMULATE_AXIM_X30 == 0)
        // buggy Dell Axim X30
        if (_tcsncmp(oemstr, L"Dell Axim X30", 13) == 0)
#endif
        {
            GXDeviceInfo gxInfo = { 0 };
            HDC hdc = GetDC(NULL);
            int result;

            gxInfo.Version = 100;
            result =
                ExtEscape(hdc, GETGXINFO, 0, NULL, sizeof(gxInfo),
                          (char *) &gxInfo);
            if (result > 0) {
                this->hidden->useGXOpenDisplay = 0;
                this->hidden->videoMem = gxInfo.pvFrameBuffer;
                this->hidden->needUpdate = 0;
                this->hidden->gxProperties.cbxPitch = 2;
                this->hidden->gxProperties.cbyPitch = 480;
                this->hidden->gxProperties.cxWidth = gxInfo.cxWidth;
                this->hidden->gxProperties.cyHeight = gxInfo.cyHeight;
                this->hidden->gxProperties.ffFormat = gxInfo.ffFormat;
            }
        }
#endif
    } else {
        this->hidden->needUpdate = 0;
        this->hidden->hiresFix = 0;
        this->hidden->gxProperties.cBPP = g_RawFrameBufferInfo.wBPP;
        this->hidden->gxProperties.cbxPitch = g_RawFrameBufferInfo.cxStride;
        this->hidden->gxProperties.cbyPitch = g_RawFrameBufferInfo.cyStride;
        this->hidden->gxProperties.cxWidth = g_RawFrameBufferInfo.cxPixels;
        this->hidden->gxProperties.cyHeight = g_RawFrameBufferInfo.cyPixels;
        this->hidden->videoMem = g_RawFrameBufferInfo.pFramePointer;
        this->hidden->useVga = 1;

        switch (g_RawFrameBufferInfo.wFormat) {
        case FORMAT_565:
            this->hidden->gxProperties.ffFormat = kfDirect565;
            break;
        case FORMAT_555:
            this->hidden->gxProperties.ffFormat = kfDirect555;
            break;
        default:
            /* unknown pixel format, try define by BPP! */
            switch (g_RawFrameBufferInfo.wBPP) {
            case 4:
            case 8:
                this->hidden->gxProperties.ffFormat = kfDirect;
            case 16:
                this->hidden->gxProperties.ffFormat = kfDirect565;
            default:
                this->hidden->gxProperties.ffFormat = kfDirect;
                break;
            }
        }
    }

    if (this->hidden->gxProperties.cBPP != 16) {
        this->hidden->gapiOrientation = SDL_ORIENTATION_UP;
    } else if ((this->hidden->gxProperties.cbxPitch > 0)
               && (this->hidden->gxProperties.cbyPitch > 0)) {
        this->hidden->gapiOrientation = SDL_ORIENTATION_UP;
    } else if ((this->hidden->gxProperties.cbxPitch > 0)
               && (this->hidden->gxProperties.cbyPitch < 0)) {
        this->hidden->gapiOrientation = SDL_ORIENTATION_RIGHT;  // ipaq 3660
    } else if ((this->hidden->gxProperties.cbxPitch < 0)
               && (this->hidden->gxProperties.cbyPitch > 0)) {
        this->hidden->gapiOrientation = SDL_ORIENTATION_LEFT;   // ipaq 3800
    }
}

static void
GAPI_CreatePalette(int ncolors, SDL_Color * colors)
{
    // Setup a custom color palette
    BYTE buffer[sizeof(LOGPALETTE) + 255 * sizeof(PALETTEENTRY)];
    int i;
    LOGPALETTE *pLogical = (LOGPALETTE *) buffer;
    PALETTEENTRY *entries = pLogical->palPalEntry;
    HPALETTE hPalette;
    HDC hdc;

    for (i = 0; i < ncolors; ++i) {
        // Find intensity by replicating the bit patterns over a byte
        entries[i].peRed = colors[i].r;
        entries[i].peGreen = colors[i].g;
        entries[i].peBlue = colors[i].b;
        entries[i].peFlags = 0;
    }

    // Create the GDI palette object
    pLogical->palVersion = 0x0300;
    pLogical->palNumEntries = ncolors;

    hPalette = CreatePalette(pLogical);
    ASSERT(hPalette);


    // Realize the palette
    hdc = GetDC(0);

    SelectPalette(hdc, hPalette, FALSE);
    RealizePalette(hdc);

    ReleaseDC(0, hdc);
    DeleteObject(hPalette);
}

int
GAPI_VideoInit(_THIS, SDL_PixelFormat * vformat)
{
    int i, bpp;

    /* Create the window */
    if (DIB_CreateWindow(this) < 0) {
        return (-1);
    }

    if (g_hGapiLib) {
        FillStructs(this, 0);

        // SDL does not supports 2/4bpp mode, so use 16 bpp
        bpp = gapi->gxProperties.cBPP < 8 ? 16 : gapi->gxProperties.cBPP;

        /* set up normal and landscape mode */
        GAPI_AddMode(this, bpp, gapi->gxProperties.cyHeight,
                     gapi->gxProperties.cxWidth);
        GAPI_AddMode(this, bpp, gapi->gxProperties.cxWidth,
                     gapi->gxProperties.cyHeight);
    }

    /* add hi-res mode */
    if (g_bRawBufferAvailable &&
        !((gapi->gxProperties.cxWidth ==
           (unsigned) g_RawFrameBufferInfo.cxPixels)
          && (gapi->gxProperties.cyHeight ==
              (unsigned) g_RawFrameBufferInfo.cyPixels))) {
        FillStructs(this, 1);

        // SDL does not supports 2/4bpp mode, so use 16 bpp
        bpp = gapi->gxProperties.cBPP < 8 ? 16 : gapi->gxProperties.cBPP;

        /* set up normal and landscape mode */
        GAPI_AddMode(this, bpp, gapi->gxProperties.cyHeight,
                     gapi->gxProperties.cxWidth);
        GAPI_AddMode(this, bpp, gapi->gxProperties.cxWidth,
                     gapi->gxProperties.cyHeight);
    }

    /* Determine the current screen size */
    this->info.current_w = gapi->gxProperties.cxWidth;
    this->info.current_h = gapi->gxProperties.cyHeight;

    /* Sort the mode lists */
    for (i = 0; i < NUM_MODELISTS; ++i) {
        if (gapi->SDL_nummodes[i] > 0) {
            SDL_qsort(gapi->SDL_modelist[i], gapi->SDL_nummodes[i],
                      sizeof *gapi->SDL_modelist[i], cmpmodes);
        }
    }

    vformat->BitsPerPixel =
        this->hidden->gxProperties.cBPP <
        8 ? 16 : (unsigned char) this->hidden->gxProperties.cBPP;

    // Get color mask
    if (this->hidden->gxProperties.ffFormat & kfDirect565) {
        vformat->BitsPerPixel = 16;
        vformat->Rmask = 0x0000f800;
        vformat->Gmask = 0x000007e0;
        vformat->Bmask = 0x0000001f;
        this->hidden->videoMode = GAPI_DIRECT_565;
    } else if (this->hidden->gxProperties.ffFormat & kfDirect555) {
        vformat->BitsPerPixel = 16;
        vformat->Rmask = 0x00007c00;
        vformat->Gmask = 0x000003e0;
        vformat->Bmask = 0x0000001f;
        this->hidden->videoMode = GAPI_DIRECT_555;
    } else if ((this->hidden->gxProperties.ffFormat & kfDirect)
               && (this->hidden->gxProperties.cBPP < 8)) {
        // We'll perform the conversion
        vformat->BitsPerPixel = 16;
        vformat->Rmask = 0x0000f800;    // 16 bit 565
        vformat->Gmask = 0x000007e0;
        vformat->Bmask = 0x0000001f;
        if (this->hidden->gxProperties.ffFormat & kfDirectInverted)
            this->hidden->invert = (1 << this->hidden->gxProperties.cBPP) - 1;
        this->hidden->colorscale =
            this->hidden->gxProperties.cBPP <
            8 ? 8 - this->hidden->gxProperties.cBPP : 0;
        this->hidden->videoMode = GAPI_MONO;
    } else if (this->hidden->gxProperties.ffFormat & kfPalette) {
        this->hidden->videoMode = GAPI_PALETTE;
    }

    /* We're done! */
    return (0);
}

SDL_Rect **
GAPI_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags)
{
    return (this->hidden->SDL_modelist[((format->BitsPerPixel + 7) / 8) - 1]);
//       return (SDL_Rect **) -1;
}

SDL_Surface *
GAPI_SetVideoMode(_THIS, SDL_Surface * current,
                  int width, int height, int bpp, Uint32 flags)
{
    SDL_Surface *video;
    Uint32 Rmask, Gmask, Bmask;
    DWORD style;
    SDL_Rect allScreen;

    if (bpp < 4) {
        SDL_SetError("1 bpp and 2 bpp modes is not implemented yet!");
        return 0;
    }

    /* Recalculate bitmasks if necessary */
    if (bpp == current->format->BitsPerPixel) {
        video = current;
    } else {
        switch (bpp) {
        case 8:
            Rmask = 0;
            Gmask = 0;
            Bmask = 0;
            break;
        case 15:
        case 16:
            /* Default is 565 unless the display is specifically 555 */
            if (this->hidden->gxProperties.ffFormat & kfDirect555) {
                Rmask = 0x00007c00;
                Gmask = 0x000003e0;
                Bmask = 0x0000001f;
            } else {
                Rmask = 0x0000f800;
                Gmask = 0x000007e0;
                Bmask = 0x0000001f;
            }
            break;
        case 24:
        case 32:
            Rmask = 0x00ff0000;
            Gmask = 0x0000ff00;
            Bmask = 0x000000ff;
            break;
        default:
            SDL_SetError("Unsupported Bits Per Pixel format requested");
            return NULL;
        }
        video = SDL_CreateRGBSurface(SDL_SWSURFACE,
                                     0, 0, bpp, Rmask, Gmask, Bmask, 0);
        if (video == NULL) {
            SDL_OutOfMemory();
            return (NULL);
        }
    }

    gapi->userOrientation = SDL_ORIENTATION_UP;
    video->flags = SDL_FULLSCREEN;      /* Clear flags, GAPI supports fullscreen only */

    /* GAPI or VGA? */
    if (g_hGapiLib) {
        FillStructs(this, 0);
        if ((((unsigned) width != gapi->gxProperties.cxWidth)
             || ((unsigned) height != gapi->gxProperties.cyHeight))
            && (((unsigned) width != gapi->gxProperties.cyHeight)
                || ((unsigned) height != gapi->gxProperties.cxWidth)))
            FillStructs(this, 1);       // gapi is found but we use VGA resolution                        
    } else
        FillStructs(this, 1);

    if (!this->hidden->needUpdate && !this->hidden->videoMem) {
        SDL_SetError
            ("Couldn't get address of video memory, may be unsupported device or bug");
        return (NULL);
    }

    /* detect user landscape mode */
    if ((width > height)
        && (GetSystemMetrics(SM_CXSCREEN) < GetSystemMetrics(SM_CYSCREEN)))
        gapi->userOrientation = SDL_ORIENTATION_RIGHT;

    /* shall we apply hires fix? for example when we do not use hires resource */
    gapi->hiresFix = 0;
    if (gapi->userOrientation == SDL_ORIENTATION_RIGHT) {
        if ((width > GetSystemMetrics(SM_CYSCREEN))
            || (height > GetSystemMetrics(SM_CXSCREEN)))
            gapi->hiresFix = 1;
    } else if ((width > GetSystemMetrics(SM_CXSCREEN))
               || (height > GetSystemMetrics(SM_CYSCREEN)))
        if (!((width == GetSystemMetrics(SM_CYSCREEN)) && (height == GetSystemMetrics(SM_CXSCREEN))))   // user portrait, device landscape
            gapi->hiresFix = 1;

    switch (gapi->userOrientation) {
    case SDL_ORIENTATION_UP:
        gapi->startOffset = 0;
        gapi->dstLineStep = gapi->gxProperties.cbyPitch;
        gapi->dstPixelStep = gapi->gxProperties.cbxPitch;
        break;
    case SDL_ORIENTATION_RIGHT:
        switch (gapi->gapiOrientation) {
        case SDL_ORIENTATION_UP:
        case SDL_ORIENTATION_RIGHT:
        case SDL_ORIENTATION_LEFT:
            if ((this->hidden->videoMode == GAPI_MONO))
                gapi->startOffset = -gapi->gxProperties.cbxPitch + 1;   // monochrome mode
            else
                gapi->startOffset =
                    gapi->gxProperties.cbyPitch *
                    (gapi->gxProperties.cyHeight - 1);

            gapi->dstLineStep = gapi->gxProperties.cbxPitch;
            gapi->dstPixelStep = -gapi->gxProperties.cbyPitch;
            break;
        }
    }

    video->w = this->hidden->w = width;
    video->h = this->hidden->h = height;
    video->pitch = SDL_CalculatePitch(video);

    /* Small fix for WinCE/Win32 - when activating window
       SDL_VideoSurface is equal to zero, so activating code
       is not called properly for fullscreen windows because
       macros WINDIB_FULLSCREEN uses SDL_VideoSurface
     */
    SDL_VideoSurface = video;

    /* GAPI is always fullscreen, title bar is useless */
    style = 0;

    if (!SDL_windowid)
        SetWindowLong(SDL_Window, GWL_STYLE, style);

    /* Allocate bitmap */
    if (gapiBuffer) {
        SDL_free(gapiBuffer);
        gapiBuffer = NULL;
    }
    gapiBuffer = SDL_malloc(video->h * video->pitch);
    video->pixels = gapiBuffer;

    if (!this->hidden->buffer) {
        SDL_SetError("Couldn't allocate buffer for requested mode");
        return (NULL);
    }

    SDL_memset(gapiBuffer, 255, video->h * video->pitch);
    MoveWindow(SDL_Window, 0, 0, GetSystemMetrics(SM_CXSCREEN),
               GetSystemMetrics(SM_CYSCREEN), FALSE);
    ShowWindow(SDL_Window, SW_SHOW);
    SetForegroundWindow(SDL_Window);

    /* JC 14 Mar 2006
       Flush the message loop or this can cause big problems later
       Especially if the user decides to use dialog boxes or assert()!
     */
    WIN_FlushMessageQueue();

    /* Open GAPI display */
    if (!gapi->useVga && this->hidden->useGXOpenDisplay)
        if (!gapi->gxFunc.GXOpenDisplay(SDL_Window, GX_FULLSCREEN)) {
            SDL_SetError("Couldn't initialize GAPI");
            return (NULL);
        }
#if REPORT_VIDEO_INFO
    printf("Video properties:\n");
    printf("display bpp: %d\n", gapi->gxProperties.cBPP);
    printf("display width: %d\n", gapi->gxProperties.cxWidth);
    printf("display height: %d\n", gapi->gxProperties.cyHeight);
    printf("x pitch: %d\n", gapi->gxProperties.cbxPitch);
    printf("y pitch: %d\n", gapi->gxProperties.cbyPitch);
    printf("gapi flags: 0x%x\n", gapi->gxProperties.ffFormat);

    if (!gapi->useVga && this->hidden->useGXOpenDisplay && gapi->needUpdate) {
        gapi->videoMem = gapi->gxFunc.GXBeginDraw();
        gapi->gxFunc.GXEndDraw();
    }

    printf("video memory: 0x%x\n", gapi->videoMem);
    printf("need update: %d\n", gapi->needUpdate);
    printf("hi-res fix: %d\n", gapi->hiresFix);
    printf("VGA is available on the device: %d\n", g_bRawBufferAvailable);
    printf("use raw framebuffer: %d\n", gapi->useVga);
    printf("video surface bpp: %d\n", video->format->BitsPerPixel);
    printf("video surface width: %d\n", video->w);
    printf("video surface height: %d\n", video->h);
#endif


    /* Blank screen */
    allScreen.x = allScreen.y = 0;
    allScreen.w = video->w - 1;
    allScreen.h = video->h - 1;
    GAPI_UpdateRects(this, 1, &allScreen);

    /* We're done */
    return (video);
}

/* We don't actually allow hardware surfaces other than the main one */
static int
GAPI_AllocHWSurface(_THIS, SDL_Surface * surface)
{
    return (-1);
}

static void
GAPI_FreeHWSurface(_THIS, SDL_Surface * surface)
{
    return;
}

/* We need to wait for vertical retrace on page flipped displays */
static int
GAPI_LockHWSurface(_THIS, SDL_Surface * surface)
{
    return (0);
}

static void
GAPI_UnlockHWSurface(_THIS, SDL_Surface * surface)
{
    return;
}

static int
updateLine8to8(_THIS, unsigned char *srcPointer, unsigned char *destPointer,
               int width, int height, int lines)
{
    if (gapi->dstPixelStep == 1) {      /* optimized blitting on most devices */
        SDL_memcpy(destPointer, srcPointer, width);
        return 1;
    } else {
        // TODO: read 4 pixels, write DWORD
        int step = gapi->dstPixelStep;
        while (width--) {
            *destPointer = *srcPointer++;
            destPointer += step;
        }
    }
    return 1;
}

/* Video memory is very slow so lets optimize as much as possible */
static int
updateLine16to16(_THIS, PIXEL * srcPointer, PIXEL * destPointer, int width,
                 int height, int lines)
{
    PIXEL *line1, *line2;
    int step = gapi->dstPixelStep / 2;

    if (step == 1) {            /* optimized blitting on most devices */
        SDL_memcpy(destPointer, srcPointer, width * sizeof(PIXEL));
        return 1;
    } else {
        if ((gapi->gapiOrientation != SDL_ORIENTATION_UP) && (gapi->userOrientation == SDL_ORIENTATION_UP))     // iPaq 3660/3800 and user orientation up
        {
            // to prevent data misalignment copy only one line
            if (((((unsigned) destPointer & 3) != 0)
                 && (gapi->gapiOrientation == SDL_ORIENTATION_LEFT))
                || ((((unsigned) destPointer & 3) == 0)
                    && (gapi->gapiOrientation != SDL_ORIENTATION_LEFT))
                || (lines == 1)) {
                while (width--) {
                    *destPointer = *srcPointer++;
                    destPointer += step;
                }
                return 1;
            }

            /* read two lines at the same time, write DWORD */
            line1 = srcPointer;
            line2 = srcPointer + SDL_VideoSurface->pitch / 2;

            if (gapi->gapiOrientation == SDL_ORIENTATION_LEFT)
                while (width--) // iPaq 3800
                {
                    *(DWORD *) destPointer = (*line2++ << 16) | *line1++;
                    destPointer += step;
            } else {
                destPointer += gapi->gxProperties.cbyPitch / 2;

                while (width--) // iPaq 3660
                {
                    *(DWORD *) destPointer = (*line1++ << 16) | *line2++;
                    destPointer += step;
                }
            }
            return 2;
        } else {
            // iPaq 3800 and user orientation landscape
            if (gapi->gapiOrientation == SDL_ORIENTATION_LEFT) {
                int w1;

                // to prevent data misalignment copy only one pixel
                if ((((unsigned) destPointer & 3) == 0) && (width > 0)) {
                    *destPointer-- = *srcPointer++;
                    width--;
                }

                destPointer--;

                w1 = width / 2;

                while (w1--) {
                    DWORD p = *(DWORD *) srcPointer;
                    *((DWORD *) destPointer) = (p << 16) | (p >> 16);
                    destPointer -= 2;
                    srcPointer += 2;
                }

                if (width & 1)  // copy the last pixel
                {
                    destPointer++;
                    *destPointer = *srcPointer;
                }

                return 1;
            }
            // modern iPaqs and user orientation landscape
            // read two pixels, write DWORD

            line1 = srcPointer;
            line2 = srcPointer + SDL_VideoSurface->pitch / 2;

            if ((((unsigned) destPointer & 3) != 0) || (lines == 1)) {
                while (width--) {
                    *destPointer = *srcPointer++;
                    destPointer += step;
                }
                return 1;
            }

            while (width--) {
                *(DWORD *) destPointer = (*line2++ << 16) | *line1++;
                destPointer -= gapi->gxProperties.cbyPitch / 2;
            }
            return 2;
        }
    }
}

// Color component masks for 565
#define REDMASK (31<<11)
#define GREENMASK (63<<5)
#define BLUEMASK (31)


static int
updateLine16to4(_THIS, PIXEL * srcPointer, unsigned char *destPointer,
                int width, int height, int lines, int yNibble, int xNibble)
{
    PIXEL *line1, *line2;
    int step = gapi->dstPixelStep;

    if (gapi->userOrientation == SDL_ORIENTATION_UP) {
        if (yNibble)            // copy bottom half of a line
        {
            while (width--) {
                PIXEL c1 = *srcPointer++;
                c1 = ((c1 & REDMASK) >> 11) + ((c1 & GREENMASK) >> 5) +
                    (c1 & BLUEMASK);
                *destPointer = (*destPointer & 0x0F) | ((~(c1 >> 3) << 4));
                destPointer += step;
            }
            return 1;
        }
        // either 1 pixel picture or tail, anyway this is the last line
        if (lines == 1) {
            while (width--) {
                PIXEL c1 = *srcPointer++;
                c1 = ((c1 & REDMASK) >> 11) + ((c1 & GREENMASK) >> 5) +
                    (c1 & BLUEMASK);
                *destPointer = (*destPointer & 0xF0) | ((~(c1 >> 3) & 0xF));
                destPointer += step;
            }
            return 1;
        }

        line1 = srcPointer;
        line2 = srcPointer + SDL_VideoSurface->pitch / 2;

        while (width--) {
            PIXEL c1 = *line1++;
            PIXEL c2 = *line2++;
            c1 = ((c1 & REDMASK) >> 11) + ((c1 & GREENMASK) >> 5) +
                (c1 & BLUEMASK);
            c2 = ((c2 & REDMASK) >> 11) + ((c2 & GREENMASK) >> 5) +
                (c2 & BLUEMASK);
            *destPointer = ~((c1 >> 3) + ((c2 >> 3) << 4));
            destPointer += step;
        }
        return 2;
    } else {
        int w1;
        w1 = width / 2;

        if (xNibble) {
            // copy one pixel
            PIXEL c1 = *srcPointer++;
            c1 = ((c1 & REDMASK) >> 11) + ((c1 & GREENMASK) >> 5) +
                (c1 & BLUEMASK);
            *destPointer = (*destPointer & 0xF0) | ((~(c1 >> 3) & 0xF));
            destPointer++;
        }

        while (w1--) {
            PIXEL c1 = *srcPointer;
            PIXEL c2 = *(srcPointer + 1);
            c1 = ((c1 & REDMASK) >> 11) + ((c1 & GREENMASK) >> 5) +
                (c1 & BLUEMASK);
            c2 = ((c2 & REDMASK) >> 11) + ((c2 & GREENMASK) >> 5) +
                (c2 & BLUEMASK);
            *destPointer++ = ~((c2 >> 3) + ((c1 >> 3) << 4));
            srcPointer += 2;
        }

        // copy tail
        if ((width & 1) && !xNibble) {
            PIXEL c1 = *srcPointer;
            c1 = ((c1 & REDMASK) >> 11) + ((c1 & GREENMASK) >> 5) +
                (c1 & BLUEMASK);
            *destPointer = (*destPointer & 0x0F) | ((~(c1 >> 3) << 4));
        }

        return 1;
    }
}

static void
GAPI_UpdateRectsMono(_THIS, int numrects, SDL_Rect * rects)
{
    int i, height;
    int linesProcessed;
    int xNibble, yNibble;

    for (i = 0; i < numrects; i++) {
        unsigned char *destPointer;
        unsigned char *srcPointer;

        if (gapi->userOrientation == SDL_ORIENTATION_UP)
            destPointer =
                (unsigned char *) gapi->videoMem + gapi->startOffset -
                rects[i].y * gapi->gxProperties.cBPP / 8 +
                rects[i].x * gapi->dstPixelStep;
        else
            destPointer =
                (unsigned char *) gapi->videoMem + gapi->startOffset +
                rects[i].x * gapi->gxProperties.cBPP / 8 +
                rects[i].y * gapi->dstLineStep;

        srcPointer =
            ((unsigned char *) SDL_VideoSurface->pixels) +
            rects[i].y * SDL_VideoSurface->pitch + rects[i].x * 2;
        yNibble = rects[i].y & 1;       // TODO: only for 4 bpp
        xNibble = rects[i].x & 1;
        height = rects[i].h;
        while (height > 0) {
            switch (gapi->gxProperties.cBPP) {
            case 2:            // TODO
            case 4:
                linesProcessed =
                    updateLine16to4(this, (PIXEL *) srcPointer,
                                    destPointer, rects[i].w,
                                    rects[i].h, height, yNibble, xNibble);
                yNibble = 0;
            }
            height -= linesProcessed;
            if (gapi->userOrientation == SDL_ORIENTATION_UP)
                destPointer--;  // always fill 1 byte
            else
                destPointer += gapi->dstLineStep;
            srcPointer += SDL_VideoSurface->pitch * linesProcessed;     // pitch in bytes
        }
    }
}

static void
GAPI_UpdateRectsColor(_THIS, int numrects, SDL_Rect * rects)
{
    int i, height;
    int bytesPerPixel = (gapi->gxProperties.cBPP + 1) / 8;
    int linesProcessed;
    for (i = 0; i < numrects; i++) {
        unsigned char *destPointer =
            (unsigned char *) gapi->videoMem + gapi->startOffset +
            rects[i].y * gapi->dstLineStep + rects[i].x * gapi->dstPixelStep;
        unsigned char *srcPointer =
            ((unsigned char *) SDL_VideoSurface->pixels) +
            rects[i].y * SDL_VideoSurface->pitch + rects[i].x * bytesPerPixel;
        height = rects[i].h;

//              fprintf(stderr, "Starting rect %dx%d, dst=0x%x, w = %d, h = %d\n", rects[i].w, rects[i].h,destPointer,rects[i].w,rects[i].h);
//              fflush(stderr);
        linesProcessed = height;

        while (height > 0) {
            switch (bytesPerPixel) {
            case 1:
                linesProcessed =
                    updateLine8to8(this, srcPointer,
                                   (unsigned char *) destPointer,
                                   rects[i].w, rects[i].h, height);
                break;
            case 2:
#pragma warning(disable: 4133)
                linesProcessed =
                    updateLine16to16(this, (PIXEL *) srcPointer,
                                     destPointer, rects[i].w,
                                     rects[i].h, height);
                break;
            }
            height -= linesProcessed;
            destPointer += gapi->dstLineStep * linesProcessed;
            srcPointer += SDL_VideoSurface->pitch * linesProcessed;     // pitch in bytes
        }
//              fprintf(stderr, "End of rect\n");
//              fflush(stderr);
    }
}


static void
GAPI_UpdateRects(_THIS, int numrects, SDL_Rect * rects)
{
    // we do not want to corrupt video memory
    if (gapi->suspended)
        return;

    if (gapi->needUpdate)
        gapi->videoMem = gapi->gxFunc.GXBeginDraw();

    if (gapi->gxProperties.cBPP < 8)
        GAPI_UpdateRectsMono(this, numrects, rects);
    else
        GAPI_UpdateRectsColor(this, numrects, rects);

    if (gapi->needUpdate)
        gapi->gxFunc.GXEndDraw();
}

/* Note:  If we are terminated, this could be called in the middle of
   another SDL video routine -- notably UpdateRects.
*/
void
GAPI_VideoQuit(_THIS)
{
    int i, j;
    /* Destroy the window and everything associated with it */
    if (SDL_Window) {
        if ((g_hGapiLib != 0) && this && this->hidden
            && this->hidden->gxFunc.GXCloseDisplay && !this->hidden->useVga)
            this->hidden->gxFunc.GXCloseDisplay();

        if (this->screen->pixels != NULL) {
            SDL_free(this->screen->pixels);
            this->screen->pixels = NULL;
        }
        if (screen_icn) {
            DestroyIcon(screen_icn);
            screen_icn = NULL;
        }

        DIB_DestroyWindow(this);
        SDL_UnregisterApp();

        SDL_Window = NULL;
#if defined(_WIN32_WCE)

// Unload wince aygshell library to prevent leak
        if (aygshell) {
            FreeLibrary(aygshell);
            aygshell = NULL;
        }
#endif

        /* Free video mode lists */
        for (i = 0; i < NUM_MODELISTS; ++i) {
            if (gapi->SDL_modelist[i] != NULL) {
                for (j = 0; gapi->SDL_modelist[i][j]; ++j)
                    SDL_free(gapi->SDL_modelist[i][j]);
                SDL_free(gapi->SDL_modelist[i]);
                gapi->SDL_modelist[i] = NULL;
            }
        }

    }

}

static void
GAPI_RealizePalette(_THIS)
{
    OutputDebugString(TEXT("GAPI_RealizePalette NOT IMPLEMENTED !\r\n"));
}

static void
GAPI_PaletteChanged(_THIS, HWND window)
{
    OutputDebugString(TEXT("GAPI_PaletteChanged NOT IMPLEMENTED !\r\n"));
}

static void
GAPI_WinPAINT(_THIS, HDC hdc)
{
    // draw current offscreen buffer on hdc

    int bpp = 16;               // we always use either 8 or 16 bpp internally

    unsigned short *bitmapData;
    HBITMAP hb;
    HDC srcDC;

    // Create a DIB
    BYTE buffer[sizeof(BITMAPINFOHEADER) + 3 * sizeof(RGBQUAD)] = { 0 };
    BITMAPINFO *pBMI = (BITMAPINFO *) buffer;
    BITMAPINFOHEADER *pHeader = &pBMI->bmiHeader;
    DWORD *pColors = (DWORD *) & pBMI->bmiColors;

    // CreateDIBSection does not support 332 pixel format on wce
    if (gapi->gxProperties.cBPP == 8)
        return;

    // DIB Header
    pHeader->biSize = sizeof(BITMAPINFOHEADER);
    pHeader->biWidth = this->hidden->w;
    pHeader->biHeight = -this->hidden->h;
    pHeader->biPlanes = 1;
    pHeader->biBitCount = bpp;
    pHeader->biCompression = BI_RGB;
    pHeader->biSizeImage = (this->hidden->w * this->hidden->h * bpp) / 8;

    // Color masks
    if (bpp == 16) {
        pColors[0] = REDMASK;
        pColors[1] = GREENMASK;
        pColors[2] = BLUEMASK;
        pHeader->biCompression = BI_BITFIELDS;
    }
    // Create the DIB
    hb = CreateDIBSection(0, pBMI, DIB_RGB_COLORS, (void **) &bitmapData, 0,
                          0);

    // copy data
    // FIXME: prevent misalignment, but I've never seen non aligned width of screen
    memcpy(bitmapData, this->hidden->buffer, pHeader->biSizeImage);
    srcDC = CreateCompatibleDC(hdc);
    SelectObject(srcDC, hb);

    BitBlt(hdc, 0, 0, this->hidden->w, this->hidden->h, srcDC, 0, 0, SRCCOPY);

    DeleteObject(hb);
    DeleteDC(srcDC);
}

int
GAPI_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color * colors)
{
    GAPI_CreatePalette(ncolors, colors);
    return 1;
}

/* vi: set ts=4 sw=4 expandtab: */