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b=134887 r=kmmclusky sr=attinasi Fix the calculation of the image pointer using

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the correct bits per pixel instead of assuming 24.  This fixes alpha blending of some backgrounds.
b=135535 r=kmmclusky sr=attinasi.  Fix the way we delete the DC.. instead of deleteobject
use deleteDC.  Should free up resources on windows.
This commit is contained in:
dcone%netscape.com 2002-04-29 02:08:56 +00:00
parent 986b884f7b
commit 4912a580f2
1 changed files with 22 additions and 12 deletions
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34
gfx/src/windows/nsImageWin.cpp
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@ -726,6 +726,7 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
HDC memDC=nsnull;
HBITMAP tmpBitmap=nsnull,oldBitmap;
unsigned char alpha;
PRInt32 targetBytesPerPixel,imageBytesPerPixel;
if (!mImageBits) {
ConvertDDBtoDIB();
@ -742,11 +743,20 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
ALPHA24BITMAPINFO bmi(width, height);
tmpBitmap = ::CreateDIBSection(memDC, (LPBITMAPINFO)&bmi, DIB_RGB_COLORS, (LPVOID *)&screenBits, NULL, 0);
oldBitmap = (HBITMAP)::SelectObject(memDC, tmpBitmap);
// number of bytes in a row on a 32 bit boundary
targetRowBytes = (bmi.bmiHeader.biWidth * bmi.bmiHeader.biBitCount) >> 5; // number of 32 bit longs
if (((PRUint32)bmi.bmiHeader.biWidth * bmi.bmiHeader.biBitCount) & 0x1F) { // make sure its a multiple of 32
targetRowBytes++; // or else there will not be enough bytes per line
}
targetRowBytes <<= 2; // divide by 4 to get the number of bytes from the number of 32 bit longs
targetBytesPerPixel = bmi.bmiHeader.biBitCount/8;
}
if (!tmpBitmap) {
if (memDC) {
::DeleteObject(memDC);
::DeleteDC(memDC);
}
// this failed..and will fall into the slow blitting code
NS_WARNING("The Creation of the tmpBitmap failed \n");
@ -755,12 +765,12 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
// this will be the image on the screen into a buffer for the blend.
::StretchBlt(memDC, 0, 0, width, height,theHDC, aDestRect.x, aDestRect.y, width, height, SRCCOPY);
targetRowBytes = ((width * 3) + 3) & ~3;
imageBytesPerPixel = mBHead->biBitCount/8;
ScaledTileHeight_Offset = ScaledTileHeight + aSYOffset;
ScaledTileWidth_Offset = ScaledTileWidth + aSXOffset;
// this is the adjusted width of these imagebuffers
temp1 = mRowBytes + 3 * aSXOffset;
temp1 = mRowBytes + imageBytesPerPixel * aSXOffset;
temp2 = mARowBytes + aSXOffset;
for (int y = 0,byw=aSYOffset; y < height; y++,byw++) {
@ -771,7 +781,7 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
imageRow = mImageBits + (byw * temp1);
alphaRow = mAlphaBits + (byw * temp2);
for (int x=0,bxw=aSXOffset;x<width;x++,targetRow+=3,imageRow+=3,bxw++, alphaRow++) {
for (int x=0,bxw=aSXOffset;x<width;x++,targetRow+=targetBytesPerPixel,imageRow+=imageBytesPerPixel,bxw++, alphaRow++) {
// if we went past the row width of our buffer.. go back and start again
if (bxw>=ScaledTileWidth_Offset) {
bxw = aSXOffset;
@ -791,7 +801,7 @@ NS_IMETHODIMP nsImageWin::DrawTile(nsIRenderingContext &aContext,
::SelectObject(memDC, oldBitmap);
::DeleteObject(tmpBitmap);
::DeleteObject(memDC);
::DeleteDC(memDC);
return(NS_OK);
}
@ -854,7 +864,7 @@ nsImageWin::ProgressiveDoubleBlit(nsDrawingSurface aSurface,
tileBits = ::CreateCompatibleBitmap(theHDC, aDestBufferWidth,aDestBufferHeight);
if (NULL == tileBits) {
::DeleteObject(offDC);
::DeleteDC(offDC);
return (PR_FALSE);
}
oldBits =(HBITMAP) ::SelectObject(offDC,tileBits);
@ -865,15 +875,15 @@ nsImageWin::ProgressiveDoubleBlit(nsDrawingSurface aSurface,
if (NULL ==maskDC){
::SelectObject(offDC,oldBits);
::DeleteObject(tileBits);
::DeleteObject(offDC);
::DeleteDC(offDC);
return (PR_FALSE);
}
maskBits = ::CreateCompatibleBitmap(theHDC, aDestBufferWidth, aDestBufferHeight);
if (NULL ==maskBits) {
::SelectObject(offDC,oldBits);
::DeleteObject(tileBits);
::DeleteObject(offDC);
::DeleteObject(maskDC);
::DeleteDC(offDC);
::DeleteDC(maskDC);
return (PR_FALSE);
}
@ -929,12 +939,12 @@ nsImageWin::ProgressiveDoubleBlit(nsDrawingSurface aSurface,
}
::SelectObject(maskDC,oldMaskBits);
::DeleteObject(maskBits);
::DeleteObject(maskDC);
::DeleteDC(maskDC);
}
::SelectObject(offDC,oldBits);
::DeleteObject(tileBits);
::DeleteObject(offDC);
::DeleteDC(offDC);
return(PR_TRUE);
}
@ -1457,6 +1467,6 @@ CompositeBitsInMemory(HDC aTheHDC, int aDX, int aDY, int aDWidth, int aDHeight,
}
::DeleteObject(tmpBitmap);
}
::DeleteObject(memDC);
::DeleteDC(memDC);
}
}