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4/8/2010
The following code example shows how to set the DirectDraw capability bits for RGB overlays that cannot be flipped.
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To make the following code example easier to read, security checking and error handling are not included. This code example should not be used in a release configuration unless it has been modified to include them. |
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#include "precomp.h" // callbacks from the DIRECTDRAW object DDHAL_DDCALLBACKS cbDDCallbacks = { sizeof( DDHAL_DDCALLBACKS ), DDHAL_CB32_CREATESURFACE | DDHAL_CB32_WAITFORVERTICALBLANK | DDHAL_CB32_CANCREATESURFACE | // DDHAL_CB32_CREATEPALETTE | // DDHAL_CB32_GETSCANLINE | 0, DDGPECreateSurface, DDGPEWaitForVerticalBlank, DDGPECanCreateSurface, NULL, NULL }; // callbacks from the DIRECTDRAWSURFACE object DDHAL_DDSURFACECALLBACKS cbDDSurfaceCallbacks = { sizeof( DDHAL_DDSURFACECALLBACKS ), DDHAL_SURFCB32_DESTROYSURFACE | DDHAL_SURFCB32_LOCK | DDHAL_SURFCB32_UNLOCK | DDHAL_SURFCB32_SETCOLORKEY | DDHAL_SURFCB32_GETBLTSTATUS | DDHAL_SURFCB32_UPDATEOVERLAY | DDHAL_SURFCB32_SETOVERLAYPOSITION | // DDHAL_SURFCB32_SETPALETTE | 0, DDGPEDestroySurface, NULL, DDGPELock, DDGPEUnlock, DDGPESetColorKey, HalGetBltStatus, NULL, HalUpdateOverlay, HalSetOverlayPosition, NULL }; // InitDDHALInfo must set up this information unsigned long g_nVideoMemorySize = 0L; unsigned char * g_pVideoMemory = NULL; // virtual address of video // memory from client's side DWORD g_nTransparentColor = 0L; EXTERN_C void buildDDHALInfo( LPDDHALINFO lpddhi, DWORD modeidx ) { GPEFlat * pGPEFlat = static_cast<GPEFlat *>(GetDDGPE()); if( !g_pVideoMemory ) // in case this is called more than once... { unsigned long VideoMemoryStart; pGPEFlat->GetVirtualVideoMemory( &VideoMemoryStart, &g_nVideoMemorySize ); DEBUGMSG( GPE_ZONE_INIT, (TEXT("GetVirtualVideoMemory returned addr=0x%08x size=%d\r\n"), VideoMemoryStart, g_nVideoMemorySize)); g_pVideoMemory = (BYTE*)VideoMemoryStart; DEBUGMSG( GPE_ZONE_INIT, (TEXT("gpVidMem=%08x\r\n"), g_pVideoMemory )); } memset( lpddhi, 0, sizeof(DDHALINFO) ); // Clear the DDHALINFO // structure lpddhi->dwSize = sizeof(DDHALINFO); lpddhi->lpDDCallbacks = &cbDDCallbacks; lpddhi->lpDDSurfaceCallbacks = &cbDDSurfaceCallbacks; lpddhi->GetDriverInfo = HalGetDriverInfo; // Capability bits. lpddhi->ddCaps.dwSize = sizeof(DDCAPS); lpddhi->ddCaps.dwVidMemTotal = g_nVideoMemorySize; lpddhi->ddCaps.dwVidMemFree = g_nVideoMemorySize; lpddhi->ddCaps.dwVidMemStride = 0; lpddhi->ddCaps.ddsCaps.dwCaps = DDSCAPS_FRONTBUFFER | DDSCAPS_OVERLAY | DDSCAPS_PRIMARYSURFACE | DDSCAPS_SYSTEMMEMORY | DDSCAPS_VIDEOMEMORY | 0; lpddhi->ddCaps.dwNumFourCCCodes = 0; lpddhi->ddCaps.dwPalCaps = 0; lpddhi->ddCaps.dwMiscCaps = 0; // DirectDraw Blttting caps refer to hardware blitting support only. lpddhi->ddCaps.dwBltCaps = 0; lpddhi->ddCaps.dwCKeyCaps = 0; lpddhi->ddCaps.dwAlphaCaps = 0; // Overlay caps. lpddhi->ddCaps.dwOverlayCaps = DDOVERLAYCAPS_FOURCC; lpddhi->ddCaps.dwMaxVisibleOverlays = 1; lpddhi->ddCaps.dwCurrVisibleOverlays = 0; lpddhi->ddCaps.dwAlignBoundarySrc = 0; lpddhi->ddCaps.dwAlignSizeSrc = 0; lpddhi->ddCaps.dwAlignBoundaryDest = 0; lpddhi->ddCaps.dwAlignSizeDest = 0; lpddhi->ddCaps.dwMinOverlayStretch = 1000; lpddhi->ddCaps.dwMaxOverlayStretch = 1000; } |
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