On 25 May '08, at 8:14 AM, Steve Christensen wrote:
Unless you know for a fact that your bitmap data is packed such that each row begins immediately after the previous row, you'll need to do a bit more work. Bitmaps can be created with [bits bytesPerRow] > bytesPerPixel * [bits pixelsWide]. In that case you could have some uninitialized bytes between the end of one row and the beginning of the next, which could affect the outcome of your test.
I agree — I've been burned by this in the past. RowBytes often seems to get rounded up to multiples of a power of 2, such as 8 or 16, probably for better cache coherency or because GPUs are optimized for it.
—Jens
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