/*
    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

	MGA CRTC2 support by Thomas Jarosch - tomj@simonv.com
	CRTC2 support is inspired by mplayer's dfbmga driver
	written by Ville Syrj��<syrjala@sci.fi>
*/
#include "SDL_config.h"

/* DirectFB video driver implementation.
*/

#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>

#include <directfb.h>
#include <directfb_version.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 "SDL_DirectFB_video.h"
#include "SDL_DirectFB_events.h"
#include "SDL_DirectFB_yuv.h"

/* The implementation dependent data for the window manager cursor */
struct WMcursor
{
    int unused;
};


/* Initialization/Query functions */
static int DirectFB_VideoInit(_THIS, SDL_PixelFormat * vformat);
static SDL_Rect **DirectFB_ListModes(_THIS, SDL_PixelFormat * format,
                                     Uint32 flags);
static SDL_Surface *DirectFB_SetVideoMode(_THIS, SDL_Surface * current,
                                          int width, int height, int bpp,
                                          Uint32 flags);
static int DirectFB_SetColors(_THIS, int firstcolor, int ncolors,
                              SDL_Color * colors);
static void DirectFB_VideoQuit(_THIS);

/* Hardware surface functions */
static int DirectFB_AllocHWSurface(_THIS, SDL_Surface * surface);
static int DirectFB_FillHWRect(_THIS, SDL_Surface * dst, SDL_Rect * dstrect,
                               Uint32 color);
static int DirectFB_LockHWSurface(_THIS, SDL_Surface * surface);
static void DirectFB_UnlockHWSurface(_THIS, SDL_Surface * surface);
static void DirectFB_FreeHWSurface(_THIS, SDL_Surface * surface);
static int DirectFB_CheckHWBlit(_THIS, SDL_Surface * src, SDL_Surface * dst);
static int DirectFB_HWAccelBlit(SDL_Surface * src, SDL_Rect * srcrect,
                                SDL_Surface * dst, SDL_Rect * dstrect);
static int DirectFB_SetHWColorKey(_THIS, SDL_Surface * surface, Uint32 key);
static int DirectFB_SetHWAlpha(_THIS, SDL_Surface * surface, Uint8 alpha);
static int DirectFB_FlipHWSurface(_THIS, SDL_Surface * surface);
static int DirectFB_ShowWMCursor(_THIS, WMcursor * cursor);

/* Various screen update functions available */
static void DirectFB_DirectUpdate(_THIS, int numrects, SDL_Rect * rects);
static void DirectFB_WindowedUpdate(_THIS, int numrects, SDL_Rect * rects);

/* This is the rect EnumModes2 uses */
struct DirectFBEnumRect
{
    SDL_Rect r;
    struct DirectFBEnumRect *next;
};

static struct DirectFBEnumRect *enumlist = NULL;


/* DirectFB driver bootstrap functions */

static int
DirectFB_Available(void)
{
    return 1;
}

static void
DirectFB_DeleteDevice(SDL_VideoDevice * device)
{
    SDL_free(device->hidden);
    SDL_free(device);
}

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

    /* 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 *)
            malloc(sizeof(*device->hidden));
    }
    if (device == NULL || device->hidden == NULL) {
        SDL_OutOfMemory();
        if (device) {
            free(device);
        }
        return (0);
    }
    SDL_memset(device->hidden, 0, sizeof(*device->hidden));

    /* Set the function pointers */
    device->VideoInit = DirectFB_VideoInit;
    device->ListModes = DirectFB_ListModes;
    device->SetVideoMode = DirectFB_SetVideoMode;
    device->SetColors = DirectFB_SetColors;
    device->UpdateRects = NULL;
    device->CreateYUVOverlay = DirectFB_CreateYUVOverlay;
    device->VideoQuit = DirectFB_VideoQuit;
    device->AllocHWSurface = DirectFB_AllocHWSurface;
    device->CheckHWBlit = DirectFB_CheckHWBlit;
    device->FillHWRect = DirectFB_FillHWRect;
    device->SetHWColorKey = DirectFB_SetHWColorKey;
    device->SetHWAlpha = DirectFB_SetHWAlpha;
    device->LockHWSurface = DirectFB_LockHWSurface;
    device->UnlockHWSurface = DirectFB_UnlockHWSurface;
    device->FlipHWSurface = DirectFB_FlipHWSurface;
    device->FreeHWSurface = DirectFB_FreeHWSurface;
    device->ShowWMCursor = DirectFB_ShowWMCursor;
    device->SetCaption = NULL;
    device->SetIcon = NULL;
    device->IconifyWindow = NULL;
    device->GrabInput = NULL;
    device->GetWMInfo = NULL;
    device->InitOSKeymap = DirectFB_InitOSKeymap;
    device->PumpEvents = DirectFB_PumpEvents;

    device->free = DirectFB_DeleteDevice;

    return device;
}

VideoBootStrap DirectFB_bootstrap = {
    "directfb", "DirectFB",
    DirectFB_Available, DirectFB_CreateDevice
};

static DFBSurfacePixelFormat
GetFormatForBpp(int bpp, IDirectFBDisplayLayer * layer)
{
    DFBDisplayLayerConfig dlc;
    int bytes = (bpp + 7) / 8;

    layer->GetConfiguration(layer, &dlc);

    if (bytes == DFB_BYTES_PER_PIXEL(dlc.pixelformat) && bytes > 1)
        return dlc.pixelformat;

    switch (bytes) {
    case 1:
        return DSPF_LUT8;
    case 2:
        return DSPF_RGB16;
    case 3:
        return DSPF_RGB24;
    case 4:
        return DSPF_RGB32;
    }

    return DSPF_UNKNOWN;
}

static DFBEnumerationResult
EnumModesCallback(int width, int height, int bpp, void *data)
{
    SDL_VideoDevice *this = (SDL_VideoDevice *) data;
    struct DirectFBEnumRect *enumrect;

    HIDDEN->nummodes++;

    if (enumlist && enumlist->r.w == width && enumlist->r.h == height)
        return DFENUM_OK;

    enumrect = SDL_calloc(1, sizeof(struct DirectFBEnumRect));
    if (!enumrect) {
        SDL_OutOfMemory();
        return DFENUM_CANCEL;
    }

    enumrect->r.w = (Uint16) width;
    enumrect->r.h = (Uint16) height;
    enumrect->next = enumlist;

    enumlist = enumrect;

    return DFENUM_OK;
}

struct private_hwdata
{
    IDirectFBSurface *surface;
    IDirectFBPalette *palette;
};

void
SetDirectFBerror(const char *function, DFBResult code)
{
    const char *error = DirectFBErrorString(code);

    if (error)
        SDL_SetError("%s: %s", function, error);
    else
        SDL_SetError("Unknown error code from %s", function);
}

static DFBSurfacePixelFormat
SDLToDFBPixelFormat(SDL_PixelFormat * format)
{
    if (format->Rmask && format->Gmask && format->Bmask) {
        switch (format->BitsPerPixel) {
        case 8:
            return DSPF_LUT8;

        case 16:
            if (format->Rmask == 0xF800 &&
                format->Gmask == 0x07E0 && format->Bmask == 0x001F)
                return DSPF_RGB16;
            /* fall through */

        case 15:
            if (format->Rmask == 0x7C00 &&
                format->Gmask == 0x03E0 && format->Bmask == 0x001F)
                return DSPF_ARGB1555;
            break;

        case 24:
            if (format->Rmask == 0xFF0000 &&
                format->Gmask == 0x00FF00 && format->Bmask == 0x0000FF)
                return DSPF_RGB24;
            break;

        case 32:
            if (format->Rmask == 0xFF0000 &&
                format->Gmask == 0x00FF00 && format->Bmask == 0x0000FF) {
                if (format->Amask == 0xFF000000)
                    return DSPF_ARGB;
                else
                    return DSPF_RGB32;
            }
            break;
        }
    } else {
        switch (format->BitsPerPixel) {
        case 8:
            return DSPF_LUT8;
        case 15:
            return DSPF_ARGB1555;
        case 16:
            return DSPF_RGB16;
        case 24:
            return DSPF_RGB24;
        case 32:
            return DSPF_RGB32;
        }
    }

    return DSPF_UNKNOWN;
}

static SDL_Palette *
AllocatePalette(int size)
{
    SDL_Palette *palette;
    SDL_Color *colors;

    palette = SDL_calloc(1, sizeof(SDL_Palette));
    if (!palette) {
        SDL_OutOfMemory();
        return NULL;
    }

    colors = SDL_calloc(size, sizeof(SDL_Color));
    if (!colors) {
        SDL_OutOfMemory();
        return NULL;
    }

    palette->ncolors = size;
    palette->colors = colors;

    return palette;
}

static int
DFBToSDLPixelFormat(DFBSurfacePixelFormat pixelformat,
                    SDL_PixelFormat * format)
{
    format->Amask = format->Rmask = format->Gmask = format->Bmask = 0;
    format->BitsPerPixel = format->BytesPerPixel = 0;

    switch (pixelformat) {
    case DSPF_A8:
        format->Amask = 0x000000FF;
        break;

    case DSPF_ARGB1555:
        format->Rmask = 0x00007C00;
        format->Gmask = 0x000003E0;
        format->Bmask = 0x0000001F;
        break;

    case DSPF_RGB16:
        format->Rmask = 0x0000F800;
        format->Gmask = 0x000007E0;
        format->Bmask = 0x0000001F;
        break;

    case DSPF_ARGB:
        format->Amask = 0;      /* apps don't seem to like that:  0xFF000000; */
        /* fall through */
    case DSPF_RGB24:
    case DSPF_RGB32:
        format->Rmask = 0x00FF0000;
        format->Gmask = 0x0000FF00;
        format->Bmask = 0x000000FF;
        break;

    case DSPF_LUT8:
        format->Rmask = 0x000000FF;
        format->Gmask = 0x000000FF;
        format->Bmask = 0x000000FF;

        if (!format->palette)
            format->palette = AllocatePalette(256);
        break;

    default:
        fprintf(stderr,
                "SDL_DirectFB: Unsupported pixelformat (0x%08x)!\n",
                pixelformat);
        return -1;
    }

    format->BitsPerPixel = DFB_BYTES_PER_PIXEL(pixelformat) * 8;
    format->BytesPerPixel = DFB_BYTES_PER_PIXEL(pixelformat);

    return 0;
}


int
DirectFB_VideoInit(_THIS, SDL_PixelFormat * vformat)
{
    int i;
    DFBResult ret;
#if (DIRECTFB_MAJOR_VERSION == 0) && (DIRECTFB_MINOR_VERSION == 9) && (DIRECTFB_MICRO_VERSION < 23)
    DFBCardCapabilities caps;
#else
    DFBGraphicsDeviceDescription caps;
#endif
    DFBDisplayLayerConfig dlc;
    struct DirectFBEnumRect *rect;
    IDirectFB *dfb = NULL;
    IDirectFBDisplayLayer *layer = NULL;
    IDirectFBEventBuffer *events = NULL;

    HIDDEN->c2layer = NULL, HIDDEN->c2frame = NULL;
    HIDDEN->enable_mga_crtc2 = 0;
    HIDDEN->mga_crtc2_stretch_overscan = 1;

    ret = DirectFBInit(NULL, NULL);
    if (ret) {
        SetDirectFBerror("DirectFBInit", ret);
        goto error;
    }

    ret = DirectFBCreate(&dfb);
    if (ret) {
        SetDirectFBerror("DirectFBCreate", ret);
        goto error;
    }

    ret = dfb->GetDisplayLayer(dfb, DLID_PRIMARY, &layer);
    if (ret) {
        SetDirectFBerror("dfb->GetDisplayLayer", ret);
        goto error;
    }

    ret = dfb->CreateInputEventBuffer(dfb, DICAPS_ALL, DFB_FALSE, &events);
    if (ret) {
        SetDirectFBerror("dfb->CreateEventBuffer", ret);
        goto error;
    }

    layer->EnableCursor(layer, 1);

    /* Query layer configuration to determine the current mode and pixelformat */
    layer->GetConfiguration(layer, &dlc);

    /* If current format is not supported use LUT8 as the default */
    if (DFBToSDLPixelFormat(dlc.pixelformat, vformat))
        DFBToSDLPixelFormat(DSPF_LUT8, vformat);

    /* Enumerate the available fullscreen modes */
    ret = dfb->EnumVideoModes(dfb, EnumModesCallback, this);
    if (ret) {
        SetDirectFBerror("dfb->EnumVideoModes", ret);
        goto error;
    }

    HIDDEN->modelist = SDL_calloc(HIDDEN->nummodes + 1, sizeof(SDL_Rect *));
    if (!HIDDEN->modelist) {
        SDL_OutOfMemory();
        goto error;
    }

    for (i = 0, rect = enumlist; rect; ++i, rect = rect->next) {
        HIDDEN->modelist[i] = &rect->r;
    }

    HIDDEN->modelist[i] = NULL;


    /* Query card capabilities to get the video memory size */
#if (DIRECTFB_MAJOR_VERSION == 0) && (DIRECTFB_MINOR_VERSION == 9) && (DIRECTFB_MICRO_VERSION < 23)
    dfb->GetCardCapabilities(dfb, &caps);
#else
    dfb->GetDeviceDescription(dfb, &caps);
#endif

    this->info.wm_available = 1;
    this->info.hw_available = 1;
    this->info.blit_hw = 1;
    this->info.blit_hw_CC = 1;
    this->info.blit_hw_A = 1;
    this->info.blit_fill = 1;
    this->info.video_mem = caps.video_memory / 1024;

    HIDDEN->initialized = 1;
    HIDDEN->dfb = dfb;
    HIDDEN->layer = layer;
    HIDDEN->eventbuffer = events;

    if (SDL_getenv("SDL_DIRECTFB_MGA_CRTC2") != NULL)
        HIDDEN->enable_mga_crtc2 = 1;

    if (HIDDEN->enable_mga_crtc2) {
        DFBDisplayLayerConfig dlc;
        DFBDisplayLayerConfigFlags failed;

        ret = dfb->GetDisplayLayer(dfb, 2, &HIDDEN->c2layer);
        if (ret) {
            SetDirectFBerror("dfb->GetDisplayLayer(CRTC2)", ret);
            goto error;
        }

        ret =
            HIDDEN->layer->SetCooperativeLevel(HIDDEN->layer,
                                               DLSCL_EXCLUSIVE);
        if (ret) {
            SetDirectFBerror
                ("layer->SetCooperativeLevel(CRTC2, EXCLUSIVE)", ret);
            goto error;
        }

        ret =
            HIDDEN->c2layer->SetCooperativeLevel(HIDDEN->c2layer,
                                                 DLSCL_EXCLUSIVE);
        if (ret) {
            SetDirectFBerror
                ("c2layer->SetCooperativeLevel(CRTC2, EXCLUSIVE)", ret);
            goto error;
        }

        HIDDEN->c2layer->SetOpacity(HIDDEN->c2layer, 0x0);

        /* Init the surface here as it got a fixed size */
        dlc.flags = DLCONF_PIXELFORMAT | DLCONF_BUFFERMODE;
        dlc.buffermode = DLBM_BACKVIDEO;
        dlc.pixelformat = DSPF_RGB32;

        ret =
            HIDDEN->c2layer->TestConfiguration(HIDDEN->c2layer, &dlc,
                                               &failed);
        if (ret) {
            SetDirectFBerror("c2layer->TestConfiguration", ret);
            goto error;
        }

        ret = HIDDEN->c2layer->SetConfiguration(HIDDEN->c2layer, &dlc);
        if (ret) {
            SetDirectFBerror("c2layer->SetConfiguration", ret);
            goto error;
        }

        ret = HIDDEN->c2layer->GetSurface(HIDDEN->c2layer, &HIDDEN->c2frame);
        if (ret) {
            SetDirectFBerror("c2layer->GetSurface", ret);
            goto error;
        }

        HIDDEN->c2framesize.x = 0;
        HIDDEN->c2framesize.y = 0;
        HIDDEN->c2frame->GetSize(HIDDEN->c2frame, &HIDDEN->c2framesize.w,
                                 &HIDDEN->c2framesize.h);

        HIDDEN->c2frame->SetBlittingFlags(HIDDEN->c2frame, DSBLIT_NOFX);
        HIDDEN->c2frame->SetColor(HIDDEN->c2frame, 0, 0, 0, 0xff);

        /* Clear CRTC2 */
        HIDDEN->c2frame->Clear(HIDDEN->c2frame, 0, 0, 0, 0xff);
        HIDDEN->c2frame->Flip(HIDDEN->c2frame, NULL, 0);
        HIDDEN->c2frame->Clear(HIDDEN->c2frame, 0, 0, 0, 0xff);
        HIDDEN->c2frame->Flip(HIDDEN->c2frame, NULL, 0);
        HIDDEN->c2frame->Clear(HIDDEN->c2frame, 0, 0, 0, 0xff);

        HIDDEN->c2layer->SetOpacity(HIDDEN->c2layer, 0xFF);

        /* Check if overscan is possibly set */
        if (SDL_getenv("SDL_DIRECTFB_MGA_OVERSCAN") != NULL) {
            float overscan = 0;
            if (SDL_sscanf
                (SDL_getenv("SDL_DIRECTFB_MGA_OVERSCAN"), "%f",
                 &overscan) == 1)
                if (overscan > 0 && overscan < 2)
                    HIDDEN->mga_crtc2_stretch_overscan = overscan;
        }
#ifdef DIRECTFB_CRTC2_DEBUG
        printf("CRTC2 overscan: %f\n", HIDDEN->mga_crtc2_stretch_overscan);
#endif
    }

    return 0;

  error:
    if (events)
        events->Release(events);

    if (HIDDEN->c2frame)
        HIDDEN->c2frame->Release(HIDDEN->c2frame);

    if (HIDDEN->c2layer)
        HIDDEN->c2layer->Release(HIDDEN->c2layer);

    if (layer)
        layer->Release(layer);

    if (dfb)
        dfb->Release(dfb);

    return -1;
}

static SDL_Rect **
DirectFB_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags)
{
    if (flags & SDL_FULLSCREEN)
        return HIDDEN->modelist;
    else if (SDLToDFBPixelFormat(format) != DSPF_UNKNOWN)
        return (SDL_Rect **) - 1;

    return NULL;
}

static SDL_Surface *
DirectFB_SetVideoMode(_THIS, SDL_Surface * current, int width, int height,
                      int bpp, Uint32 flags)
{
    DFBResult ret;
    DFBSurfaceDescription dsc;
    DFBSurfacePixelFormat pixelformat;
    IDirectFBSurface *surface;

    fprintf(stderr, "SDL DirectFB_SetVideoMode: %dx%d@%d, flags: 0x%08x\n",
            width, height, bpp, flags);

    flags |= SDL_FULLSCREEN;

    /* Release previous primary surface */
    if (current->hwdata && current->hwdata->surface) {
        current->hwdata->surface->Release(current->hwdata->surface);
        current->hwdata->surface = NULL;

        /* And its palette if present */
        if (current->hwdata->palette) {
            current->hwdata->palette->Release(current->hwdata->palette);
            current->hwdata->palette = NULL;
        }
    } else if (!current->hwdata) {
        /* Allocate the hardware acceleration data */
        current->hwdata =
            (struct private_hwdata *) SDL_calloc(1, sizeof(*current->hwdata));
        if (!current->hwdata) {
            SDL_OutOfMemory();
            return NULL;
        }
    }

    /* Set cooperative level depending on flag SDL_FULLSCREEN */
    if (flags & SDL_FULLSCREEN) {
        ret = HIDDEN->dfb->SetCooperativeLevel(HIDDEN->dfb, DFSCL_FULLSCREEN);
        if (ret && !HIDDEN->enable_mga_crtc2) {
            DirectFBError("dfb->SetCooperativeLevel", ret);
            flags &= ~SDL_FULLSCREEN;
        }
    } else
        HIDDEN->dfb->SetCooperativeLevel(HIDDEN->dfb, DFSCL_NORMAL);

    /* Set video mode */
    ret = HIDDEN->dfb->SetVideoMode(HIDDEN->dfb, width, height, bpp);
    if (ret) {
        if (flags & SDL_FULLSCREEN) {
            flags &= ~SDL_FULLSCREEN;
            HIDDEN->dfb->SetCooperativeLevel(HIDDEN->dfb, DFSCL_NORMAL);
            ret = HIDDEN->dfb->SetVideoMode(HIDDEN->dfb, width, height, bpp);
        }

        if (ret) {
            SetDirectFBerror("dfb->SetVideoMode", ret);
            return NULL;
        }
    }

    /* Create primary surface */
    dsc.flags = DSDESC_CAPS | DSDESC_PIXELFORMAT;
    dsc.caps =
        DSCAPS_PRIMARY | ((flags & SDL_DOUBLEBUF) ? DSCAPS_FLIPPING : 0);
    dsc.pixelformat = GetFormatForBpp(bpp, HIDDEN->layer);

    ret = HIDDEN->dfb->CreateSurface(HIDDEN->dfb, &dsc, &surface);
    if (ret && (flags & SDL_DOUBLEBUF)) {
        /* Try without double buffering */
        dsc.caps &= ~DSCAPS_FLIPPING;
        ret = HIDDEN->dfb->CreateSurface(HIDDEN->dfb, &dsc, &surface);
    }
    if (ret) {
        SetDirectFBerror("dfb->CreateSurface", ret);
        return NULL;
    }

    current->w = width;
    current->h = height;
    current->flags = SDL_HWSURFACE | SDL_PREALLOC;

    if (flags & SDL_FULLSCREEN) {
        current->flags |= SDL_FULLSCREEN;
        this->UpdateRects = DirectFB_DirectUpdate;
    } else
        this->UpdateRects = DirectFB_WindowedUpdate;

    if (dsc.caps & DSCAPS_FLIPPING)
        current->flags |= SDL_DOUBLEBUF;

    surface->GetPixelFormat(surface, &pixelformat);

    DFBToSDLPixelFormat(pixelformat, current->format);

    /* Get the surface palette (if supported) */
    if (DFB_PIXELFORMAT_IS_INDEXED(pixelformat)) {
        surface->GetPalette(surface, &current->hwdata->palette);

        current->flags |= SDL_HWPALETTE;
    }

    current->hwdata->surface = surface;

    /* MGA CRTC2 stuff */
    if (HIDDEN->enable_mga_crtc2) {
        /* no stretching if c2ssize == c2framesize */
        HIDDEN->c2ssize.x = 0, HIDDEN->c2ssize.y = 0;
        HIDDEN->c2ssize.w = width;
        HIDDEN->c2ssize.h = height;

        HIDDEN->c2dsize.x = 0, HIDDEN->c2dsize.y = 0;
        HIDDEN->c2dsize.w = width;
        HIDDEN->c2dsize.h = height;

        HIDDEN->mga_crtc2_stretch = 0;

        if (SDL_getenv("SDL_DIRECTFB_MGA_STRETCH") != NULL) {
            /* Normally assume a picture aspect ratio of 4:3 */
            int zoom_aspect_x = 4, zoom_aspect_y = 3, i, j;

            for (i = 1; i < 20; i++) {
                for (j = 1; j < 10; j++) {
                    if ((float) width / (float) i * (float) j == height) {
                        zoom_aspect_x = i;
                        zoom_aspect_y = j;

                        /* break the loop */
                        i = 21;
                        break;
                    }
                }
            }

#ifdef DIRECTFB_CRTC2_DEBUG
            printf
                ("Source resolution: X: %d, Y: %d, Aspect ratio: %d:%d\n",
                 width, height, zoom_aspect_x, zoom_aspect_y);
            printf("CRTC2 resolution: X: %d, Y: %d\n",
                   HIDDEN->c2framesize.w, HIDDEN->c2framesize.h);
#endif

            /* don't stretch only slightly smaller/larger images */
            if ((float) width < (float) HIDDEN->c2framesize.w * 0.95
                || (float) height < (float) HIDDEN->c2framesize.h * 0.95) {
                while ((float) HIDDEN->c2dsize.w <
                       (float) HIDDEN->c2framesize.w *
                       HIDDEN->mga_crtc2_stretch_overscan
                       && (float) HIDDEN->c2dsize.h <
                       (float) HIDDEN->c2framesize.h *
                       HIDDEN->mga_crtc2_stretch_overscan) {
                    HIDDEN->c2dsize.w += zoom_aspect_x;
                    HIDDEN->c2dsize.h += zoom_aspect_y;
                }

                /* one step down */
                HIDDEN->c2dsize.w -= zoom_aspect_x;
                HIDDEN->c2dsize.h -= zoom_aspect_y;

#ifdef DIRECTFB_CRTC2_DEBUG
                printf("Stretched resolution: X: %d, Y: %d\n",
                       HIDDEN->c2dsize.w, HIDDEN->c2dsize.h);
#endif

                HIDDEN->mga_crtc2_stretch = 1;
            } else if ((float) width > (float) HIDDEN->c2framesize.w * 0.95
                       || (float) height >
                       (float) HIDDEN->c2framesize.h * 0.95) {
                while ((float) HIDDEN->c2dsize.w >
                       (float) HIDDEN->c2framesize.w *
                       HIDDEN->mga_crtc2_stretch_overscan
                       || (float) HIDDEN->c2dsize.h >
                       (float) HIDDEN->c2framesize.h *
                       HIDDEN->mga_crtc2_stretch_overscan) {
                    HIDDEN->c2dsize.w -= zoom_aspect_x;
                    HIDDEN->c2dsize.h -= zoom_aspect_y;
                }

#ifdef DIRECTFB_CRTC2_DEBUG
                printf("Down-Stretched resolution: X: %d, Y: %d\n",
                       HIDDEN->c2dsize.w, HIDDEN->c2dsize.h);
#endif

                HIDDEN->mga_crtc2_stretch = 1;
            } else {
#ifdef DIRECTFB_CRTC2_DEBUG
                printf("Not stretching image\n");
#endif
            }

            /* Panning */
            if (HIDDEN->c2framesize.w > HIDDEN->c2dsize.w)
                HIDDEN->c2dsize.x =
                    (HIDDEN->c2framesize.w - HIDDEN->c2dsize.w) / 2;
            else
                HIDDEN->c2dsize.x =
                    (HIDDEN->c2dsize.w - HIDDEN->c2framesize.w) / 2;

            if (HIDDEN->c2framesize.h > HIDDEN->c2dsize.h)
                HIDDEN->c2dsize.y =
                    (HIDDEN->c2framesize.h - HIDDEN->c2dsize.h) / 2;
            else
                HIDDEN->c2dsize.y =
                    (HIDDEN->c2dsize.h - HIDDEN->c2framesize.h) / 2;

#ifdef DIRECTFB_CRTC2_DEBUG
            printf("CRTC2 position X: %d, Y: %d\n", HIDDEN->c2dsize.x,
                   HIDDEN->c2dsize.y);
#endif
        }
    }

    return current;
}

static int
DirectFB_AllocHWSurface(_THIS, SDL_Surface * surface)
{
    DFBResult ret;
    DFBSurfaceDescription dsc;

    /*  fprintf(stderr, "SDL: DirectFB_AllocHWSurface (%dx%d@%d, flags: 0x%08x)\n",
       surface->w, surface->h, surface->format->BitsPerPixel, surface->flags); */

    if (surface->w < 8 || surface->h < 8)
        return -1;

    /* fill surface description */
    dsc.flags =
        DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT | DSDESC_CAPS;
    dsc.width = surface->w;
    dsc.height = surface->h;
    dsc.caps = (surface->flags & SDL_DOUBLEBUF) ? DSCAPS_FLIPPING : 0;

    /* find the right pixelformat */
    dsc.pixelformat = SDLToDFBPixelFormat(surface->format);
    if (dsc.pixelformat == DSPF_UNKNOWN)
        return -1;

    /* Allocate the hardware acceleration data */
    surface->hwdata =
        (struct private_hwdata *) SDL_calloc(1, sizeof(*surface->hwdata));
    if (surface->hwdata == NULL) {
        SDL_OutOfMemory();
        return -1;
    }

    /* Create the surface */
    ret =
        HIDDEN->dfb->CreateSurface(HIDDEN->dfb, &dsc,
                                   &surface->hwdata->surface);
    if (ret) {
        SetDirectFBerror("dfb->CreateSurface", ret);
        free(surface->hwdata);
        surface->hwdata = NULL;
        return -1;
    }

    surface->flags |= SDL_HWSURFACE | SDL_PREALLOC;

    return 0;
}

static void
DirectFB_FreeHWSurface(_THIS, SDL_Surface * surface)
{
    if (surface->hwdata && HIDDEN->initialized) {
        surface->hwdata->surface->Release(surface->hwdata->surface);
        free(surface->hwdata);
        surface->hwdata = NULL;
    }
}

static int
DirectFB_CheckHWBlit(_THIS, SDL_Surface * src, SDL_Surface * dst)
{
    /*  fprintf(stderr, "SDL: DirectFB_CheckHWBlit (src->hwdata: %p, dst->hwdata: %p)\n",
       src->hwdata, dst->hwdata); */

    if (!src->hwdata || !dst->hwdata)
        return 0;

    src->flags |= SDL_HWACCEL;
    src->map->hw_blit = DirectFB_HWAccelBlit;

    return 1;
}

static int
DirectFB_HWAccelBlit(SDL_Surface * src, SDL_Rect * srcrect,
                     SDL_Surface * dst, SDL_Rect * dstrect)
{
    DFBSurfaceBlittingFlags flags = DSBLIT_NOFX;

    DFBRectangle sr = { srcrect->x, srcrect->y, srcrect->w, srcrect->h };
    DFBRectangle dr = { dstrect->x, dstrect->y, dstrect->w, dstrect->h };

    IDirectFBSurface *surface = dst->hwdata->surface;

    if (src->flags & SDL_SRCCOLORKEY) {
        flags |= DSBLIT_SRC_COLORKEY;
        DirectFB_SetHWColorKey(NULL, src, src->format->colorkey);
    }

    if (src->flags & SDL_SRCALPHA) {
        flags |= DSBLIT_BLEND_COLORALPHA;
        surface->SetColor(surface, 0xff, 0xff, 0xff, src->format->alpha);
    }

    surface->SetBlittingFlags(surface, flags);

    if (sr.w == dr.w && sr.h == dr.h)
        surface->Blit(surface, src->hwdata->surface, &sr, dr.x, dr.y);
    else
        surface->StretchBlit(surface, src->hwdata->surface, &sr, &dr);

    return 0;
}

static int
DirectFB_FillHWRect(_THIS, SDL_Surface * dst, SDL_Rect * dstrect,
                    Uint32 color)
{
    SDL_PixelFormat *fmt = dst->format;
    IDirectFBSurface *surface = dst->hwdata->surface;

    /* ugly */
    surface->SetColor(surface,
                      (color & fmt->Rmask) >> (fmt->Rshift - fmt->Rloss),
                      (color & fmt->Gmask) >> (fmt->Gshift - fmt->Gloss),
                      (color & fmt->Bmask) << (fmt->Bloss - fmt->Bshift),
                      0xFF);
    surface->FillRectangle(surface, dstrect->x, dstrect->y, dstrect->w,
                           dstrect->h);

    return 0;
}

static int
DirectFB_SetHWColorKey(_THIS, SDL_Surface * src, Uint32 key)
{
    SDL_PixelFormat *fmt = src->format;
    IDirectFBSurface *surface = src->hwdata->surface;

    if (fmt->BitsPerPixel == 8)
        surface->SetSrcColorKeyIndex(surface, key);
    else
        /* ugly */
        surface->SetSrcColorKey(surface,
                                (key & fmt->Rmask) >> (fmt->Rshift -
                                                       fmt->Rloss),
                                (key & fmt->Gmask) >> (fmt->Gshift -
                                                       fmt->Gloss),
                                (key & fmt->Bmask) << (fmt->Bloss -
                                                       fmt->Bshift));

    return 0;
}

static int
DirectFB_SetHWAlpha(_THIS, SDL_Surface * surface, Uint8 alpha)
{
    return 0;
}

static int
DirectFB_FlipHWSurface(_THIS, SDL_Surface * surface)
{
    if (HIDDEN->enable_mga_crtc2) {
        int rtn =
            surface->hwdata->surface->Flip(surface->hwdata->surface, NULL,
                                           0);
        if (HIDDEN->mga_crtc2_stretch)
            HIDDEN->c2frame->StretchBlit(HIDDEN->c2frame,
                                         surface->hwdata->surface,
                                         &HIDDEN->c2ssize, &HIDDEN->c2dsize);
        else
            HIDDEN->c2frame->Blit(HIDDEN->c2frame,
                                  surface->hwdata->surface, NULL,
                                  HIDDEN->c2dsize.x, HIDDEN->c2dsize.y);

        HIDDEN->c2frame->Flip(HIDDEN->c2frame, NULL, DSFLIP_WAITFORSYNC);
        return rtn;
    } else
        return surface->hwdata->surface->Flip(surface->hwdata->surface, NULL,
                                              DSFLIP_WAITFORSYNC);
}

static int
DirectFB_LockHWSurface(_THIS, SDL_Surface * surface)
{
    DFBResult ret;
    void *data;
    int pitch;

    ret = surface->hwdata->surface->Lock(surface->hwdata->surface,
                                         DSLF_WRITE, &data, &pitch);
    if (ret) {
        SetDirectFBerror("surface->Lock", ret);
        return -1;
    }

    surface->pixels = data;
    surface->pitch = pitch;

    return 0;
}

static void
DirectFB_UnlockHWSurface(_THIS, SDL_Surface * surface)
{
    surface->hwdata->surface->Unlock(surface->hwdata->surface);
    surface->pixels = NULL;
}

static void
DirectFB_DirectUpdate(_THIS, int numrects, SDL_Rect * rects)
{
    if (HIDDEN->enable_mga_crtc2) {
        if (HIDDEN->mga_crtc2_stretch)
            HIDDEN->c2frame->StretchBlit(HIDDEN->c2frame,
                                         this->screen->hwdata->surface,
                                         &HIDDEN->c2ssize, &HIDDEN->c2dsize);
        else
            HIDDEN->c2frame->Blit(HIDDEN->c2frame,
                                  this->screen->hwdata->surface, NULL,
                                  HIDDEN->c2dsize.x, HIDDEN->c2dsize.y);

        HIDDEN->c2frame->Flip(HIDDEN->c2frame, NULL, DSFLIP_WAITFORSYNC);
    }
}

static void
DirectFB_WindowedUpdate(_THIS, int numrects, SDL_Rect * rects)
{
    DFBRegion region;
    int i;
    int region_valid = 0;
    IDirectFBSurface *surface = this->screen->hwdata->surface;

    for (i = 0; i < numrects; ++i) {
        int x2, y2;

        if (!rects[i].w)        /* Clipped? */
            continue;

        x2 = rects[i].x + rects[i].w - 1;
        y2 = rects[i].y + rects[i].h - 1;

        if (region_valid) {
            if (rects[i].x < region.x1)
                region.x1 = rects[i].x;

            if (rects[i].y < region.y1)
                region.y1 = rects[i].y;

            if (x2 > region.x2)
                region.x2 = x2;

            if (y2 > region.y2)
                region.y2 = y2;
        } else {
            region.x1 = rects[i].x;
            region.y1 = rects[i].y;
            region.x2 = x2;
            region.y2 = y2;

            region_valid = 1;
        }
    }

    if (region_valid) {
        if (HIDDEN->enable_mga_crtc2) {
            if (HIDDEN->mga_crtc2_stretch)
                HIDDEN->c2frame->StretchBlit(HIDDEN->c2frame, surface,
                                             &HIDDEN->c2ssize,
                                             &HIDDEN->c2dsize);
            else
                HIDDEN->c2frame->Blit(HIDDEN->c2frame, surface, NULL,
                                      HIDDEN->c2dsize.x, HIDDEN->c2dsize.y);

            HIDDEN->c2frame->Flip(HIDDEN->c2frame, NULL, DSFLIP_WAITFORSYNC);
        } else
            surface->Flip(surface, &region, DSFLIP_WAITFORSYNC);
    }
}

int
DirectFB_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color * colors)
{
    IDirectFBPalette *palette = this->screen->hwdata->palette;

    if (!palette)
        return 0;

    if (firstcolor > 255)
        return 0;

    if (firstcolor + ncolors > 256)
        ncolors = 256 - firstcolor;

    if (ncolors > 0) {
        int i;
        DFBColor entries[ncolors];

        for (i = 0; i < ncolors; i++) {
            entries[i].a = 0xff;
            entries[i].r = colors[i].r;
            entries[i].g = colors[i].g;
            entries[i].b = colors[i].b;
        }

        palette->SetEntries(palette, entries, ncolors, firstcolor);
    }

    return 1;
}

void
DirectFB_VideoQuit(_THIS)
{
    struct DirectFBEnumRect *rect = enumlist;

    if (this->screen && this->screen->hwdata) {
        IDirectFBSurface *surface = this->screen->hwdata->surface;
        IDirectFBPalette *palette = this->screen->hwdata->palette;

        if (palette)
            palette->Release(palette);

        if (surface)
            surface->Release(surface);

        this->screen->hwdata->surface = NULL;
        this->screen->hwdata->palette = NULL;
    }

    if (HIDDEN->c2frame) {
        HIDDEN->c2frame->Release(HIDDEN->c2frame);
        HIDDEN->c2frame = NULL;
    }

    if (HIDDEN->eventbuffer) {
        HIDDEN->eventbuffer->Release(HIDDEN->eventbuffer);
        HIDDEN->eventbuffer = NULL;
    }

    if (HIDDEN->c2layer) {
        HIDDEN->c2layer->Release(HIDDEN->c2layer);
        HIDDEN->c2layer = NULL;
    }

    if (HIDDEN->layer) {
        HIDDEN->layer->Release(HIDDEN->layer);
        HIDDEN->layer = NULL;
    }

    if (HIDDEN->dfb) {
        HIDDEN->dfb->Release(HIDDEN->dfb);
        HIDDEN->dfb = NULL;
    }

    /* Free video mode list */
    if (HIDDEN->modelist) {
        free(HIDDEN->modelist);
        HIDDEN->modelist = NULL;
    }

    /* Free mode enumeration list */
    while (rect) {
        struct DirectFBEnumRect *next = rect->next;
        free(rect);
        rect = next;
    }
    enumlist = NULL;

    HIDDEN->initialized = 0;
}


int
DirectFB_ShowWMCursor(_THIS, WMcursor * cursor)
{
    /* We can only hide or show the default cursor */
    if (cursor == NULL) {
        HIDDEN->layer->SetCursorOpacity(HIDDEN->layer, 0x00);
    } else {
        HIDDEN->layer->SetCursorOpacity(HIDDEN->layer, 0xFF);
    }
    return 1;
}

void
DirectFB_FinalQuit(void)
{
}

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