static Bool
winInitScreenShadowGDI(ScreenPtr pScreen)
{
winScreenPriv(pScreen);
/* Get device contexts for the screen and shadow bitmap */
pScreenPriv->hdcScreen = GetDC(pScreenPriv->hwndScreen);
pScreenPriv->hdcShadow = CreateCompatibleDC(pScreenPriv->hdcScreen);
/* Allocate bitmap info header */
pScreenPriv->pbmih = malloc(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD));
if (pScreenPriv->pbmih == NULL) {
ErrorF("winInitScreenShadowGDI - malloc () failed\n");
return FALSE;
}
/* Query the screen format */
if (!winQueryScreenDIBFormat(pScreen, pScreenPriv->pbmih)) {
ErrorF("winInitScreenShadowGDI - winQueryScreenDIBFormat failed\n");
return FALSE;
}
/* Determine our color masks */
if (!winQueryRGBBitsAndMasks(pScreen)) {
ErrorF("winInitScreenShadowGDI - winQueryRGBBitsAndMasks failed\n");
return FALSE;
}
return winAllocateFBShadowGDI(pScreen);
}
static Bool
winAllocateFBShadowGDI (ScreenPtr pScreen)
{
winScreenPriv(pScreen);
winScreenInfo *pScreenInfo = pScreenPriv->pScreenInfo;
BITMAPINFOHEADER *pbmih = NULL;
DIBSECTION dibsection;
Bool fReturn = TRUE;
/* Get device contexts for the screen and shadow bitmap */
pScreenPriv->hdcScreen = GetDC (pScreenPriv->hwndScreen);
pScreenPriv->hdcShadow = CreateCompatibleDC (pScreenPriv->hdcScreen);
/* Allocate bitmap info header */
pbmih = (BITMAPINFOHEADER*) malloc (sizeof (BITMAPINFOHEADER)
+ 256 * sizeof (RGBQUAD));
if (pbmih == NULL)
{
ErrorF ("winAllocateFBShadowGDI - malloc () failed\n");
return FALSE;
}
/* Query the screen format */
fReturn = winQueryScreenDIBFormat (pScreen, pbmih);
/* Describe shadow bitmap to be created */
pbmih->biWidth = pScreenInfo->dwWidth;
pbmih->biHeight = -pScreenInfo->dwHeight;
ErrorF ("winAllocateFBShadowGDI - Creating DIB with width: %d height: %d "
"depth: %d\n",
(int) pbmih->biWidth, (int) -pbmih->biHeight, pbmih->biBitCount);
/* Create a DI shadow bitmap with a bit pointer */
pScreenPriv->hbmpShadow = CreateDIBSection (pScreenPriv->hdcScreen,
(BITMAPINFO *) pbmih,
DIB_RGB_COLORS,
(VOID**) &pScreenInfo->pfb,
NULL,
0);
if (pScreenPriv->hbmpShadow == NULL || pScreenInfo->pfb == NULL)
{
winW32Error (2, "winAllocateFBShadowGDI - CreateDIBSection failed:");
return FALSE;
}
else
{
#if CYGDEBUG
winDebug ("winAllocateFBShadowGDI - Shadow buffer allocated\n");
#endif
}
/* Get information about the bitmap that was allocated */
GetObject (pScreenPriv->hbmpShadow,
sizeof (dibsection),
&dibsection);
#if CYGDEBUG || YES
/* Print information about bitmap allocated */
winDebug ("winAllocateFBShadowGDI - Dibsection width: %d height: %d "
"depth: %d size image: %d\n",
(int) dibsection.dsBmih.biWidth, (int) dibsection.dsBmih.biHeight,
dibsection.dsBmih.biBitCount,
(int) dibsection.dsBmih.biSizeImage);
#endif
/* Select the shadow bitmap into the shadow DC */
SelectObject (pScreenPriv->hdcShadow,
pScreenPriv->hbmpShadow);
#if CYGDEBUG
winDebug ("winAllocateFBShadowGDI - Attempting a shadow blit\n");
#endif
/* Do a test blit from the shadow to the screen, I think */
fReturn = BitBlt (pScreenPriv->hdcScreen,
0, 0,
pScreenInfo->dwWidth, pScreenInfo->dwHeight,
pScreenPriv->hdcShadow,
0, 0,
SRCCOPY);
if (fReturn)
{
#if CYGDEBUG
winDebug ("winAllocateFBShadowGDI - Shadow blit success\n");
#endif
}
else
{
winW32Error (2, "winAllocateFBShadowGDI - Shadow blit failure\n");
#if 0
return FALSE;
#else
/* ago: ignore this error. The blit fails with wine, but does not
* cause any problems later. */
fReturn = TRUE;
#endif
}
/* Look for height weirdness */
if (dibsection.dsBmih.biHeight < 0)
{
dibsection.dsBmih.biHeight = -dibsection.dsBmih.biHeight;
}
/* Set screeninfo stride */
pScreenInfo->dwStride = ((dibsection.dsBmih.biSizeImage
/ dibsection.dsBmih.biHeight)
* 8) / pScreenInfo->dwBPP;
#if CYGDEBUG || YES
winDebug ("winAllocateFBShadowGDI - Created shadow stride: %d\n",
(int) pScreenInfo->dwStride);
#endif
/* See if the shadow bitmap will be larger than the DIB size limit */
if (pScreenInfo->dwWidth * pScreenInfo->dwHeight * pScreenInfo->dwBPP
>= WIN_DIB_MAXIMUM_SIZE)
{
ErrorF ("winAllocateFBShadowGDI - Requested DIB (bitmap) "
"will be larger than %d MB. The surface may fail to be "
"allocated on Windows 95, 98, or Me, due to a %d MB limit in "
"DIB size. This limit does not apply to Windows NT/2000, and "
"this message may be ignored on those platforms.\n",
WIN_DIB_MAXIMUM_SIZE_MB, WIN_DIB_MAXIMUM_SIZE_MB);
}
/* Determine our color masks */
if (!winQueryRGBBitsAndMasks (pScreen))
{
ErrorF ("winAllocateFBShadowGDI - winQueryRGBBitsAndMasks failed\n");
return FALSE;
}
#ifdef XWIN_MULTIWINDOW
/* Redraw all windows */
if (pScreenInfo->fMultiWindow)
EnumThreadWindows (g_dwCurrentThreadID, winRedrawAllProcShadowGDI, 0);
#endif
return fReturn;
}
