directx.c

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        {
            *pp_surface_final = NULL;
            return VLC_EGENERIC;
        }
    }

    if( !b_overlay )
    {
        vlc_bool_t b_rgb_surface =
            ( i_chroma == VLC_FOURCC('R','G','B','2') )
          || ( i_chroma == VLC_FOURCC('R','V','1','5') )
           || ( i_chroma == VLC_FOURCC('R','V','1','6') )
            || ( i_chroma == VLC_FOURCC('R','V','2','4') )
             || ( i_chroma == VLC_FOURCC('R','V','3','2') );

        memset( &ddsd, 0, sizeof( DDSURFACEDESC ) );
        ddsd.dwSize = sizeof(DDSURFACEDESC);
        ddsd.ddpfPixelFormat.dwSize = sizeof(DDPIXELFORMAT);
        ddsd.dwFlags = DDSD_HEIGHT | DDSD_WIDTH | DDSD_CAPS;
        ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
        ddsd.dwHeight = p_vout->render.i_height;
        ddsd.dwWidth = p_vout->render.i_width;

        if( p_vout->p_sys->b_use_sysmem )
            ddsd.ddsCaps.dwCaps |= DDSCAPS_SYSTEMMEMORY;
        else
            ddsd.ddsCaps.dwCaps |= DDSCAPS_VIDEOMEMORY;

        if( !b_rgb_surface )
        {
            ddsd.dwFlags |= DDSD_PIXELFORMAT;
            ddsd.ddpfPixelFormat.dwFlags = DDPF_FOURCC;
            ddsd.ddpfPixelFormat.dwFourCC = i_chroma;
        }

        dxresult = IDirectDraw2_CreateSurface( p_vout->p_sys->p_ddobject,
                                               &ddsd, &p_surface, NULL );
        if( dxresult != DD_OK )
        {
            *pp_surface_final = NULL;
            return VLC_EGENERIC;
        }
    }

    /* Now that the surface is created, try to get a newer DirectX interface */
    dxresult = IDirectDrawSurface_QueryInterface( p_surface,
                                     &IID_IDirectDrawSurface2,
                                     (LPVOID *)pp_surface_final );
    IDirectDrawSurface_Release( p_surface );    /* Release the old interface */
    if ( dxresult != DD_OK )
    {
        msg_Err( p_vout, "cannot query IDirectDrawSurface2 interface "
                         "(error %li)", dxresult );
        *pp_surface_final = NULL;
        return VLC_EGENERIC;
    }

    if( b_overlay )
    {
        /* Check the overlay is useable as some graphics cards allow creating
         * several overlays but only one can be used at one time. */
        p_vout->p_sys->p_current_surface = *pp_surface_final;
        if( DirectXUpdateOverlay( p_vout ) != VLC_SUCCESS )
        {
            IDirectDrawSurface2_Release( *pp_surface_final );
            *pp_surface_final = NULL;
            msg_Err( p_vout, "overlay unuseable (might already be in use)" );
            return VLC_EGENERIC;
        }
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DirectXUpdateOverlay: Move or resize overlay surface on video display.
 *****************************************************************************
 * This function is used to move or resize an overlay surface on the screen.
 * Ususally the overlay is moved by the user and thus, by a move or resize
 * event (in Manage).
 *****************************************************************************/
int DirectXUpdateOverlay( vout_thread_t *p_vout )
{
    DDOVERLAYFX     ddofx;
    DWORD           dwFlags;
    HRESULT         dxresult;

    if( p_vout->p_sys->p_current_surface == NULL ||
        !p_vout->p_sys->b_using_overlay )
        return VLC_EGENERIC;

    /* The new window dimensions should already have been computed by the
     * caller of this function */

    /* Position and show the overlay */
    memset(&ddofx, 0, sizeof(DDOVERLAYFX));
    ddofx.dwSize = sizeof(DDOVERLAYFX);
    ddofx.dckDestColorkey.dwColorSpaceLowValue = p_vout->p_sys->i_colorkey;
    ddofx.dckDestColorkey.dwColorSpaceHighValue = p_vout->p_sys->i_colorkey;

    dwFlags = DDOVER_SHOW | DDOVER_KEYDESTOVERRIDE;

    dxresult = IDirectDrawSurface2_UpdateOverlay(
                                         p_vout->p_sys->p_current_surface,
                                         &p_vout->p_sys->rect_src_clipped,
                                         p_vout->p_sys->p_display,
                                         &p_vout->p_sys->rect_dest_clipped,
                                         dwFlags, &ddofx );
    if(dxresult != DD_OK)
    {
        msg_Warn( p_vout,
                  "DirectXUpdateOverlay cannot move or resize overlay" );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DirectXCloseDDraw: Release the DDraw object allocated by DirectXInitDDraw
 *****************************************************************************
 * This function returns all resources allocated by DirectXInitDDraw.
 *****************************************************************************/
static void DirectXCloseDDraw( vout_thread_t *p_vout )
{
    msg_Dbg( p_vout, "DirectXCloseDDraw" );
    if( p_vout->p_sys->p_ddobject != NULL )
    {
        IDirectDraw2_Release(p_vout->p_sys->p_ddobject);
        p_vout->p_sys->p_ddobject = NULL;
    }

    if( p_vout->p_sys->hddraw_dll != NULL )
    {
        FreeLibrary( p_vout->p_sys->hddraw_dll );
        p_vout->p_sys->hddraw_dll = NULL;
    }

    if( p_vout->p_sys->p_display_driver != NULL )
    {
        free( p_vout->p_sys->p_display_driver );
        p_vout->p_sys->p_display_driver = NULL;
    }

    p_vout->p_sys->hmonitor = NULL;
}

/*****************************************************************************
 * DirectXCloseDisplay: close and reset the DirectX display device
 *****************************************************************************
 * This function returns all resources allocated by DirectXCreateDisplay.
 *****************************************************************************/
static void DirectXCloseDisplay( vout_thread_t *p_vout )
{
    msg_Dbg( p_vout, "DirectXCloseDisplay" );

    if( p_vout->p_sys->p_clipper != NULL )
    {
        msg_Dbg( p_vout, "DirectXCloseDisplay clipper" );
        IDirectDrawClipper_Release( p_vout->p_sys->p_clipper );
        p_vout->p_sys->p_clipper = NULL;
    }

    if( p_vout->p_sys->p_display != NULL )
    {
        msg_Dbg( p_vout, "DirectXCloseDisplay display" );
        IDirectDrawSurface2_Release( p_vout->p_sys->p_display );
        p_vout->p_sys->p_display = NULL;
    }
}

/*****************************************************************************
 * DirectXCloseSurface: close the YUV overlay or RGB surface.
 *****************************************************************************
 * This function returns all resources allocated for the surface.
 *****************************************************************************/
static void DirectXCloseSurface( vout_thread_t *p_vout,
                                 LPDIRECTDRAWSURFACE2 p_surface )
{
    msg_Dbg( p_vout, "DirectXCloseSurface" );
    if( p_surface != NULL )
    {
        IDirectDrawSurface2_Release( p_surface );
    }
}

/*****************************************************************************
 * NewPictureVec: allocate a vector of identical pictures
 *****************************************************************************
 * Returns 0 on success, -1 otherwise
 *****************************************************************************/
static int NewPictureVec( vout_thread_t *p_vout, picture_t *p_pic,
                          int i_num_pics )
{
    int i;
    int i_ret = VLC_SUCCESS;
    LPDIRECTDRAWSURFACE2 p_surface;

    msg_Dbg( p_vout, "NewPictureVec overlay:%s chroma:%.4s",
             p_vout->p_sys->b_using_overlay ? "yes" : "no",
             (char *)&p_vout->output.i_chroma );

    I_OUTPUTPICTURES = 0;

    /* First we try to use an YUV overlay surface.
     * The overlay surface that we create won't be used to decode directly
     * into it because accessing video memory directly is way to slow (remember
     * that pictures are decoded macroblock per macroblock). Instead the video
     * will be decoded in picture buffers in system memory which will then be
     * memcpy() to the overlay surface. */
    if( p_vout->p_sys->b_using_overlay )
    {
        /* Triple buffering rocks! it doesn't have any processing overhead
         * (you don't have to wait for the vsync) and provides for a very nice
         * video quality (no tearing). */
        if( p_vout->p_sys->b_3buf_overlay )
            i_ret = DirectXCreateSurface( p_vout, &p_surface,
                                          p_vout->output.i_chroma,
                                          p_vout->p_sys->b_using_overlay,
                                          2 /* number of backbuffers */ );

        if( !p_vout->p_sys->b_3buf_overlay || i_ret != VLC_SUCCESS )
        {
            /* Try to reduce the number of backbuffers */
            i_ret = DirectXCreateSurface( p_vout, &p_surface,
                                          p_vout->output.i_chroma,
                                          p_vout->p_sys->b_using_overlay,
                                          0 /* number of backbuffers */ );
        }

        if( i_ret == VLC_SUCCESS )
        {
            DDSCAPS dds_caps;
            picture_t front_pic;
            picture_sys_t front_pic_sys;
            front_pic.p_sys = &front_pic_sys;

            /* Allocate internal structure */
            p_pic[0].p_sys = malloc( sizeof( picture_sys_t ) );
            if( p_pic[0].p_sys == NULL )
            {
                DirectXCloseSurface( p_vout, p_surface );
                return VLC_ENOMEM;
            }

            /* set front buffer */
            p_pic[0].p_sys->p_front_surface = p_surface;

            /* Get the back buffer */
            memset( &dds_caps, 0, sizeof( DDSCAPS ) );
            dds_caps.dwCaps = DDSCAPS_BACKBUFFER;
            if( DD_OK != IDirectDrawSurface2_GetAttachedSurface(
                                                p_surface, &dds_caps,
                                                &p_pic[0].p_sys->p_surface ) )
            {
                msg_Warn( p_vout, "NewPictureVec could not get back buffer" );
                /* front buffer is the same as back buffer */
                p_pic[0].p_sys->p_surface = p_surface;
            }


            p_vout->p_sys->p_current_surface = front_pic.p_sys->p_surface =
                p_pic[0].p_sys->p_front_surface;

            /* Reset the front buffer memory */
            if( DirectXLockSurface( p_vout, &front_pic ) == VLC_SUCCESS )
            {
                int i,j;
                for( i = 0; i < front_pic.i_planes; i++ )
                    for( j = 0; j < front_pic.p[i].i_lines; j++)
                        memset( front_pic.p[i].p_pixels + j *
                                front_pic.p[i].i_pitch, 127,
                                front_pic.p[i].i_visible_pitch );

                DirectXUnlockSurface( p_vout, &front_pic );
            }

            DirectXUpdateOverlay( p_vout );
            I_OUTPUTPICTURES = 1;
            msg_Dbg( p_vout, "YUV overlay created successfully" );
        }
    }

    /* As we can't have an overlay, we'll try to create a plain offscreen
     * surface. This surface will reside in video memory because there's a
     * better chance then that we'll be able to use some kind of hardware
     * acceleration like rescaling, blitting or YUV->RGB conversions.
     * We then only need to blit this surface onto the main display when we
     * want to display it */
    if( !p_vout->p_sys->b_using_overlay )
    {
        if( p_vout->p_sys->b_hw_yuv )
        {
            DWORD i_codes;
            DWORD *pi_codes;
            vlc_bool_t b_result = VLC_FALSE;

            /* Check if the chroma is supported first. This is required
             * because a few buggy drivers don't mind creating the surface
             * even if they don't know about the chroma. */
            if( IDirectDraw2_GetFourCCCodes( p_vout->p_sys->p_ddobject,
                                             &i_codes, NULL ) == DD_OK )
            {
                pi_codes = malloc( i_codes * sizeof(DWORD) );
                if( pi_codes && IDirectDraw2_GetFourCCCodes(
                    p_vout->p_sys->p_ddobject, &i_codes, pi_codes ) == DD_OK )
                {
                    for( i = 0; i < (int)i_codes; i++ )
                    {
                        if( p_vout->output.i_chroma == pi_codes[i] )
                        {
                            b_result = VLC_TRUE;
                            break;
                        }
                    }
                }
            }

            if( b_result )
                i_ret = DirectXCreateSurface( p_vout, &p_surface,
                                              p_vout->output.i_chroma,
                                              0 /* no overlay */,
                                              0 /* no back buffers */ );
            else
                p_vout->p_sys->b_hw_yuv = VLC_FALSE;
        }

        if( i_ret || !p_vout->p_sys->b_hw_yuv )
        {
            /* Our last choice is to use a plain RGB surface */
            DDPIXELFORMAT ddpfPixelFormat;

            ddpfPixelFormat.dwSize = sizeof(DDPIXELFORMAT);
            IDirectDrawSurface2_GetPixelFormat( p_vout->p_sys->p_display,