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Bug #89181 --> dword align the moz-icon RGB data so they render at certain

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resolutions.
r=pavlov
sr=sspitzer
This commit is contained in:
mscott%netscape.com 2001-07-10 00:55:06 +00:00
parent 5bb0279a0b
commit 0f3b19b652
1 changed files with 40 additions and 0 deletions
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40
modules/libpr0n/decoders/icon/win/nsIconChannel.cpp
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@ -44,6 +44,7 @@
// Takes a bitmap from the windows registry and converts it into 4 byte RGB data.
void ConvertColorBitMap(unsigned char * aBitmapBuffer, PBITMAPINFO pBitMapInfo, nsCString& iconBuffer);
void ConvertMaskBitMap(unsigned char * aBitMaskBuffer, PBITMAPINFOHEADER pBitMapInfo, nsCString& iconBuffer);
PRUint32 CalcWordAlignedRowSpan(PRUint32 aWidth, PRUint32 aBitCount);
// nsIconChannel methods
nsIconChannel::nsIconChannel()
@ -187,8 +188,15 @@ void ConvertColorBitMap(unsigned char * buffer, PBITMAPINFO pBitMapInfo, nsCStri
// windows invers the row order in their bitmaps. So we need to invert the rows back into a top-down order.
PRUint32 bytesPerPixel = pBitMapInfo->bmiHeader.biBitCount / 8;
PRUint32 unalignedBytesPerRow = pBitMapInfo->bmiHeader.biWidth * 3;
InvertRows(buffer, pBitMapInfo->bmiHeader.biSizeImage, pBitMapInfo->bmiHeader.biWidth * bytesPerPixel);
PRUint32 alignedBytesPerRow = CalcWordAlignedRowSpan(pBitMapInfo->bmiHeader.biWidth, 24);
PRInt32 numBytesPaddingPerRow = alignedBytesPerRow - unalignedBytesPerRow;
PRUint32 pos = 0;
if (numBytesPaddingPerRow < 0) // this should never happen.....
numBytesPaddingPerRow = 0;
PRUint32 index = 0;
// if each pixel uses 16 bits to describe the color then each R, G, and B value uses 5 bites. Use some fancy
// bit operations to blow up the 16 bit case into 1 byte per component color. Actually windows
@ -222,6 +230,15 @@ void ConvertColorBitMap(unsigned char * buffer, PBITMAPINFO pBitMapInfo, nsCStri
iconBuffer.Append((char) blueValue);
iconBuffer.Append((char) greenValue);
iconBuffer.Append((char) redValue);
pos += bytesPerPixel;
if (pos == unalignedBytesPerRow && numBytesPaddingPerRow) // if we have reached the end of a current row, add padding to force dword alignment
{
pos = 0;
for (PRUint32 i = 0; i < numBytesPaddingPerRow; i++)
{
iconBuffer.Append((char) 0);
}
}
index += bytesPerPixel;
}
}
@ -232,11 +249,34 @@ void ConvertColorBitMap(unsigned char * buffer, PBITMAPINFO pBitMapInfo, nsCStri
iconBuffer.Append((char) buffer[index]);
iconBuffer.Append((char) buffer[index+1]);
iconBuffer.Append((char) buffer[index+2]);
pos += 3;
if (pos == unalignedBytesPerRow && numBytesPaddingPerRow) // if we have reached the end of a current row, add padding to force dword alignment
{
pos = 0;
for (PRUint32 i = 0; i < numBytesPaddingPerRow; i++)
{
iconBuffer.Append((char) 0);
}
}
index += bytesPerPixel;
}
}
}
PRUint32 CalcWordAlignedRowSpan(PRUint32 aWidth, PRUint32 aBitCount)
{
PRUint32 spanBytes;
spanBytes = (aWidth * aBitCount) >> 5;
if (((PRUint32) aWidth * aBitCount) & 0x1F)
spanBytes++;
spanBytes <<= 2;
return spanBytes;
}
void ConvertMaskBitMap(unsigned char * aBitMaskBuffer, PBITMAPINFOHEADER pBitMapHeaderInfo, nsCString& iconBuffer)
{
InvertRows(aBitMaskBuffer, pBitMapHeaderInfo->biSizeImage, 4);