ddvideo.cpp

英特尔&#174 线程构建模块（英特尔&#174 TBB）是一个屡获殊荣的 C++ 运行时库

    // Set cooperation level with other windows to be normal (ie. not full screen)
    // You MUST set the cooperation level to be SOMETHING, for windowed apps use
    // DDSCL_NORMAL, for full screen use: DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN.
    hRet = g_pDD->SetCooperativeLevel(g_hAppWnd, DDSCL_NORMAL);
    if (hRet != DD_OK)
        return DisplayError("Can't set cooperative level", hRet);
    return DDPrimaryInit();
}

//! Setup the overlay object
bool DDOverlayInit()
{
    // Get hardware's CAPabilitieS
    memset(&g_DDCaps, 0, sizeof(g_DDCaps));
    g_DDCaps.dwSize = sizeof(g_DDCaps);
    if (g_pDD->GetCaps(&g_DDCaps, 0))
        return DisplayError("Can't get capabilities");

    // Make sure it supports overlays
    if (!(g_DDCaps.dwCaps & DDCAPS_OVERLAY))
        return DisplayError("Hardware doesn't support overlays");

    //DO NOT Make sure it supports stretching (scaling)
    //if (!(g_DDCaps.dwCaps & DDCAPS_OVERLAYSTRETCH)) return false;

    DDSURFACEDESC2              ddsd;  // DirectDraw surface descriptor
    HRESULT                     hRet;  // I'm not even going to try...
    // The pixel formats that we want the surface to be in
    DDPIXELFORMAT               ddpfOverlayFormats[] = {
        {sizeof(DDPIXELFORMAT), DDPF_RGB, 0, 32, 0xFF0000, 0x0FF00, 0x0000FF, 0}, // 32-bit RGB
        {sizeof(DDPIXELFORMAT), DDPF_RGB, 0, 16, 0x007C00, 0x003e0, 0x00001F, 0}, // 16-bit RGB 5:5:5
        {sizeof(DDPIXELFORMAT), DDPF_RGB, 0, 16, 0x00F800, 0x007e0, 0x00001F, 0}, // 16-bit RGB 5:6:5
        {sizeof(DDPIXELFORMAT), DDPF_FOURCC, mmioFOURCC('U','Y','V','Y'), 16, 0, 0, 0, 0}, // UYVY
        {sizeof(DDPIXELFORMAT), DDPF_FOURCC, mmioFOURCC('Y','4','2','2'), 16, 0, 0, 0, 0}, // the same as UYVY
        {sizeof(DDPIXELFORMAT), DDPF_FOURCC, mmioFOURCC('Y','U','Y','2'), 16, 0, 0, 0, 0}, // YUY2 is unsupported color-space here
        {0}};

    // Setup the overlay surface's attributes in the surface descriptor
    memset(&ddsd, 0, sizeof(ddsd));
    ddsd.dwSize = sizeof(ddsd);
    ddsd.ddsCaps.dwCaps = DDSCAPS_OVERLAY | g_DDCaps.ddsCaps.dwCaps&DDSCAPS_VIDEOMEMORY;
    ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
    ddsd.dwBackBufferCount = 0;
    ddsd.dwWidth = g_sizex;
    ddsd.dwHeight = g_sizey;
    for(int format = 0; ddpfOverlayFormats[format].dwSize; format++) {
        ddsd.ddpfPixelFormat = ddpfOverlayFormats[format];
        // Attempt to create the surface with theses settings
        hRet = g_pDD->CreateSurface(&ddsd, &g_pDDSOverlay, NULL);
        if(hRet == DD_OK) break;
    }
    if (hRet != DD_OK)
        return DisplayError("Can't create appropriate overlay surface", hRet);
    return true;
}

inline void mouse(int k, LPARAM lParam)
{
    int x = (int)LOWORD(lParam), y = (int)HIWORD(lParam);
    g_video->on_mouse( x*g_sizex/(g_rcDst.right - g_rcDst.left),
        y*g_sizey/(g_rcDst.bottom - g_rcDst.top), k);
}

LRESULT CALLBACK InternalWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT                 ps;         // Structure for the paint message
    POINT                       p = {0, 0}; // Translation point for the window's client region
    HRESULT                     hRet;

    switch (iMsg)
    {
        case WM_MOVE:
            // Make sure we're not moving to be minimized - because otherwise
            // our ratio varialbes (g_dwXRatio and g_dwYRatio) will end up
            // being 0, and once we hit CheckBoundries it divides by 0.
            if (!IsIconic(hwnd))
            {
                g_rcSrc.left = 0;
                g_rcSrc.right = g_sizex;
                g_rcSrc.top = 0;
                g_rcSrc.bottom = g_sizey;
                GetClientRect(hwnd, &g_rcDst);
                g_dwXRatio = (g_rcDst.right - g_rcDst.left) * 1000 /
                             (g_rcSrc.right - g_rcSrc.left);
                g_dwYRatio = (g_rcDst.bottom - g_rcDst.top) * 1000 /
                             (g_rcSrc.bottom - g_rcSrc.top);
                ClientToScreen(hwnd, &p);
                g_rcDst.left = p.x;
                g_rcDst.top = p.y;
                g_rcDst.bottom += p.y;
                g_rcDst.right += p.x;
                CheckBoundries();
            }
            else
                // Else, hide the overlay... just in case we can't do
                // destination color keying, this will pull the overlay
                // off of the screen for the user.
                if (g_pDDSOverlay && g_pDDSPrimary)
                    g_pDDSOverlay->UpdateOverlay(NULL, g_pDDSPrimary, NULL, DDOVER_HIDE, NULL);
            // Check to make sure our window exists before we tell it to
            // repaint. This will fail the first time (while the window is being created).
            if (hwnd)
            {
                InvalidateRect(hwnd, NULL, FALSE);
                UpdateWindow(hwnd);
            }
            return 0L;

        case WM_SIZE:
            // Another check for the minimization action.  This check is
            // quicker though...
            if (wParam != SIZE_MINIMIZED)
            {
                GetClientRect(hwnd, &g_rcDst);
                ClientToScreen(hwnd, &p);
                g_rcDst.left = p.x;
                g_rcDst.top = p.y;
                g_rcDst.bottom += p.y;
                g_rcDst.right += p.x;
                g_rcSrc.left = 0;
                g_rcSrc.right = g_sizex;
                g_rcSrc.top = 0;
                g_rcSrc.bottom = g_sizey;
                // Here we multiply by 1000 to preserve 3 decimal places in the
                // division opperation (we picked 1000 to be on the same order
                // of magnitude as the stretch factor for easier comparisons)
                g_dwXRatio = (g_rcDst.right - g_rcDst.left) * 1000 /
                             (g_rcSrc.right - g_rcSrc.left);
                g_dwYRatio = (g_rcDst.bottom - g_rcDst.top) * 1000 /
                             (g_rcSrc.bottom - g_rcSrc.top);
                CheckBoundries();
            }
            return 0L;

        case WM_PAINT:
            BeginPaint(hwnd, &ps);
            // Check the primary surface to see if it's lost - if so you can
            // pretty much bet that the other surfaces are also lost - thus
            // restore EVERYTHING!  If we got our surfaces stolen by a full
            // screen app - then we'll destroy our primary - and won't be able
            // to initialize it again. When we get our next paint message (the
            // full screen app closed for example) we'll want to try to reinit
            // the surfaces again - that's why there is a check for
            // g_pDDSPrimary == NULL.  The other option, is that our program
            // went through this process, could init the primary again, but it
            // couldn't init the overlay, that's why there's a third check for
            // g_pDDSOverlay == NULL.  Make sure that the check for
            // !g_pDDSPrimary is BEFORE the IsLost call - that way if the
            // pointer is NULL (ie. !g_pDDSPrimary is TRUE) - the compiler
            // won't try to evaluate the IsLost function (which, since the
            // g_pDDSPrimary surface is NULL, would be bad...).
            if (!g_pDDSPrimary || (g_pDDSPrimary->IsLost() != DD_OK) ||
                (g_pDDSOverlay == NULL))
            {
                DestroyOverlay();
                DestroyPrimary();
                if (DDPrimaryInit())
                    if (DDOverlayInit())
                        if (!DrawOverlay())
                            DestroyOverlay();
            }
            // UpdateOverlay is how we put the overlay on the screen.
            if (g_pDDSOverlay && g_pDDSPrimary && g_video->updating)
            {
                hRet = g_pDDSOverlay->UpdateOverlay(&g_rcSrc, g_pDDSPrimary,
                                                    &g_rcDst, g_OverlayFlags,
                                                    &g_OverlayFX);
#ifdef _DEBUG
                if(hRet != DD_OK) DisplayError("Can't update overlay", hRet);
#endif
            }
            EndPaint(hwnd, &ps);
            return 0L;

        // process mouse and keyboard events
        case WM_LBUTTONDOWN:    mouse(1, lParam); break;
        case WM_LBUTTONUP:      mouse(-1, lParam); break;
        case WM_RBUTTONDOWN:    mouse(2, lParam); break;
        case WM_RBUTTONUP:      mouse(-2, lParam); break;
        case WM_MBUTTONDOWN:    mouse(3, lParam); break;
        case WM_MBUTTONUP:      mouse(-3, lParam); break;
        case WM_CHAR:           g_video->on_key(wParam); break;

        case WM_DISPLAYCHANGE:  return 0L;

        case WM_DESTROY:
            // Now, shut down the window...
            PostQuitMessage(0);
            return 0L;
    }
    return g_pUserProc? g_pUserProc(hwnd, iMsg, wParam, lParam) : DefWindowProc(hwnd, iMsg, wParam, lParam);
}

DWORD WINAPI thread_vsync(LPVOID lpParameter)
{
    BOOL vblank = false;
    while(g_video && g_video->running) {
        while(!vblank && g_video && g_video->running) {
            Sleep(0); LPDIRECTDRAW7 pDD(g_pDD); if(pDD) pDD->GetVerticalBlankStatus(&vblank);
        }
        LPDIRECTDRAWSURFACE7 pDDSOverlay(g_pDDSOverlay);
        if(pDDSOverlay) pDDSOverlay->UpdateOverlay(&g_rcSrc, g_pDDSPrimary, &g_rcDst, g_OverlayFlags | DDOVER_REFRESHALL, &g_OverlayFX);
        do {
            Sleep(1); LPDIRECTDRAW7 pDD(g_pDD); if(pDD) pDD->GetVerticalBlankStatus(&vblank);
        } while(vblank && g_video && g_video->running);
        while(g_video && !g_video->updating && g_video->running) Sleep(10);
    }
    return 0;
}

///////////////////////////////////////////// public methods of video class ///////////////////////

inline void mask2bits(unsigned int mask, color_t &save, char &shift)
{
    save  = mask; if(!mask) { shift = 8; return; }
    shift = 0; while(!(mask&1)) ++shift, mask >>= 1;
    int bits = 0; while(mask&1) ++bits,  mask >>= 1;
    shift += bits - 8;
}

bool video::init_window(int sizex, int sizey)
{
    assert(win_hInstance != 0);
    g_sizex = sizex; g_sizey = sizey;
    if( !WinInit(win_hInstance, win_iCmdShow, gWndClass, title, false) )
        return DisplayError("Unable to initialize the program's window.");
    running = true;
    if( !DDInit() ) {
        DestroyDDraw();
        goto fail;
    }
    if( !DDOverlayInit() || !DrawOverlay() ) {
        DestroyOverlay();
        DestroyDDraw();
        goto fail;
    }
    DDPIXELFORMAT PixelFormat; memset(&PixelFormat, 0, sizeof(PixelFormat)); PixelFormat.dwSize = sizeof(PixelFormat);
    g_pDDSOverlay->GetPixelFormat(&PixelFormat);
    mask2bits(PixelFormat.dwRBitMask, red_mask, red_shift);
    mask2bits(PixelFormat.dwGBitMask, green_mask, green_shift);
    mask2bits(PixelFormat.dwBBitMask, blue_mask, blue_shift);
    if(PixelFormat.dwFlags == DDPF_RGB)
         depth = char(PixelFormat.dwRGBBitCount);
    else depth = -char(PixelFormat.dwFourCC);
    for(int i = 0, e = sizex * sizey * PixelFormat.dwRGBBitCount / 32, c = get_color(0, 0, 0); i < e; i++)
        g_pImg[i] = c; // clear surface
    ShowWindow(g_hAppWnd, SW_SHOW);
    g_hVSync = CreateThread (
	    NULL,				// LPSECURITY_ATTRIBUTES security_attrs
	    0,					// SIZE_T stacksize
	    (LPTHREAD_START_ROUTINE) thread_vsync,
	    this,               // argument
	    0, 0);
    SetPriorityClass(g_hVSync, IDLE_PRIORITY_CLASS); // questionable
    return true;
fail:
    g_pImg = new unsigned int[g_sizex * g_sizey];
    return false;
}

void video::terminate()
{
    running = false;
    DestroyOverlay();
    if(WaitForSingleObject(g_hVSync, 100) == WAIT_TIMEOUT) TerminateThread(g_hVSync, 0);
    CloseHandle(g_hVSync);
    DestroyDDraw();
    if(g_pImg) delete[] g_pImg;
    g_pImg = 0; g_video = 0;
}
//////////// drawing area constructor & destructor /////////////

drawing_area::drawing_area(int x, int y, int sizex, int sizey)
: start_x(x), start_y(y), size_x(sizex), size_y(sizey), pixel_depth(g_video->depth),
    base_index(y*g_sizex + x), max_index(g_sizex*g_sizey), index_stride(g_sizex), ptr32(g_pImg)
{
    assert(ptr32); assert(x < g_sizex); assert(y < g_sizey);
    assert(x+sizex <= g_sizex); assert(y+sizey <= g_sizey);

    index = base_index; // current index
}

drawing_area::~drawing_area()
{
}