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Fix math and add notes.

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svn path=/trunk/; revision=28501
This commit is contained in:
James Tabor
2007-08-23 22:29:37 +00:00
parent c2de09f61a
commit f7da3af16d
1 changed files with 3 additions and 3 deletions
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reactos/dll/win32/gdi32/objects/bitmap.c
+3 -3
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@@ -3,7 +3,7 @@
/*
* Return the full scan size for a bitmap.
*
* Based on Wine and Windows Graphics Prog pg 595
* Based on Wine, Utils.c and Windows Graphics Prog pg 595
*/
UINT
FASTCALL
@@ -20,10 +20,10 @@ DIB_BitmapMaxBitsSize( PBITMAPINFO Info, UINT ScanLines )
{
if ((Info->bmiHeader.biCompression) && (Info->bmiHeader.biCompression != BI_BITFIELDS))
return Info->bmiHeader.biSizeImage;
// Planes are over looked by Yuan. I guess assumed always 1.
MaxBits = Info->bmiHeader.biBitCount * Info->bmiHeader.biPlanes * Info->bmiHeader.biWidth;
}
// Planes are over looked by Yuan. I guess assumed always 1.
MaxBits = (MaxBits + 31) / 32; // ScanLineSize = (Width * bitcount + 31)/32
MaxBits = ((MaxBits + 31) & ~31 ) / 8; // From Yuan, ScanLineSize = (Width * bitcount + 31)/32
return (MaxBits * ScanLines); // ret the full Size.
}