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Bug 183427. Re-anable Windows GDI AlphaBlending. r=smontagu, sr=kin

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This commit is contained in:
paper%animecity.nu 2002-12-17 21:22:09 +00:00
parent d34b5dd6c1
commit 9a031b744d
1 changed files with 19 additions and 15 deletions
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34
gfx/src/windows/nsImageWin.cpp
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@ -1079,7 +1079,7 @@ PRBool nsImageWin::CanAlphaBlend(void)
/** ----------------------------------------------------------------
* Create an optimized bitmap, -- this routine may need to be deleted, not really used now
* Create an optimized bitmap
* @update dc - 11/20/98
* @param aContext - The device context to use for the optimization
*/
@ -1089,11 +1089,15 @@ nsImageWin :: Optimize(nsIDeviceContext* aContext)
// we used to set a flag because a valid HDC may not be ready,
// like at startup, but now we just roll our own HDC for the given screen.
// Windows 95/98/Me: DDB size cannot exceed 16MB in size.
if ((gPlatform == VER_PLATFORM_WIN32_WINDOWS && mSizeImage >= 0xFF0000) || (mAlphaDepth == 8) || (!CanAlphaBlend()) ){
// Windows 95/98/Me: DDB size cannot exceed ~16MB in size.
// We also can not optimize empty images, or 8-bit alpha depth images on
// Win98 due to a Windows API bug.
if ((gPlatform == VER_PLATFORM_WIN32_WINDOWS && mSizeImage >= 0xFF0000) ||
(mAlphaDepth == 8 && !CanAlphaBlend()) ||
(mSizeImage <= 0)) {
return NS_OK;
}
}
HDC TheHDC = ::CreateCompatibleDC(NULL);
if (TheHDC != NULL){
@ -1113,17 +1117,17 @@ nsImageWin :: Optimize(nsIDeviceContext* aContext)
HBITMAP tBitmap = ::CreateBitmap(1,1,planes,bpp,NULL);
HBITMAP oldbits = (HBITMAP)::SelectObject(TheHDC,tBitmap);
if (mSizeImage > 0){
if (mAlphaDepth == 8) {
CreateImageWithAlphaBits(TheHDC);
} else {
mHBitmap = ::CreateDIBitmap(TheHDC,mBHead,CBM_INIT,mImageBits,(LPBITMAPINFO)mBHead,
256==mNumPaletteColors?DIB_PAL_COLORS:DIB_RGB_COLORS);
mIsOptimized = (mHBitmap != 0);
}
if (mIsOptimized)
CleanUpDIB();
if (mAlphaDepth == 8) {
CreateImageWithAlphaBits(TheHDC);
} else {
mHBitmap = ::CreateDIBitmap(TheHDC, mBHead, CBM_INIT, mImageBits,
(LPBITMAPINFO)mBHead,
256 == mNumPaletteColors ? DIB_PAL_COLORS
: DIB_RGB_COLORS);
mIsOptimized = (mHBitmap != 0);
}
if (mIsOptimized)
CleanUpDIB();
::SelectObject(TheHDC,oldbits);
::DeleteObject(tBitmap);
::DeleteDC(TheHDC);