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windowscodecs: Implement CopyPixels for 4-bit ICO icons.

This commit is contained in:
Vincent Povirk 2009-08-20 14:38:51 -05:00 committed by Alexandre Julliard
parent 5d7cd19556
commit a65010aa19
1 changed files with 50 additions and 0 deletions
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50
dlls/windowscodecs/icoformat.c
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@ -203,6 +203,56 @@ static HRESULT IcoFrameDecode_ReadPixels(IcoFrameDecode *This)
/* read the XOR data */
switch (This->entry.wBitCount)
{
case 4:
{
UINT xorBytesPerRow = (width+7)/8*4;
UINT xorBytes = xorBytesPerRow * height;
INT xorStride;
BYTE *xorRow;
BYTE *bitsRow;
UINT x, y;
tempdata = HeapAlloc(GetProcessHeap(), 0, xorBytes);
if (!tempdata)
{
hr = E_OUTOFMEMORY;
goto fail;
}
hr = IStream_Read(This->parent->stream, tempdata, xorBytes, &bytesread);
if (FAILED(hr) || bytesread != xorBytes) goto fail;
if (bih.biHeight > 0) /* bottom-up DIB */
{
xorStride = -xorBytesPerRow;
xorRow = tempdata + (height-1)*xorBytesPerRow;
}
else /* top-down DIB */
{
xorStride = xorBytesPerRow;
xorRow = tempdata;
}
bits = HeapAlloc(GetProcessHeap(), 0, bitsSize);
/* palette-map the 4-bit data */
bitsRow = bits;
for (y=0; y<height; y++) {
BYTE *xorByte=xorRow;
DWORD *bitsPixel=(DWORD*)bitsRow;
for (x=0; x<width; x+=2) {
BYTE xorVal;
xorVal=*xorByte++;
*bitsPixel++ = colors[xorVal>>4];
if (x+1 < width) *bitsPixel++ = colors[xorVal&0xf];
}
xorRow += xorStride;
bitsRow += bitsStride;
}
HeapFree(GetProcessHeap(), 0, tempdata);
break;
}
case 8:
{
UINT xorBytesPerRow = (width+3)/4*4;