Windows ce 5.0 alpha blending

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The source coordinates are transformed by using the transformation currently specified for the source device context. If the source device context identifies an enhanced metafile device context, an error occurs and the function returns FALSE. If destination and source bitmaps do not have the same color format, AlphaBlend converts the source bitmap to match the destination bitmap. AlphaBlend does not support mirroring.

If either the width or height of the source or destination is negative, the call to AlphaBlend will fail. Note that, for a display DC, all blending operations are supported and these flags represent whether the operations are accelerated.

The source rectangle must lie completely within the source surface, otherwise an error occurs and the function returns FALSE. The SourceConstantAlpha value is combined with any per-pixel alpha values. If SourceConstantAlpha is 0, it is assumed that the image is transparent.