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Old December 19th, 2007, 07:45 PM
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Default Bitmap Transparency

How is bitmap transparency (or opacity) implemented in c++?
Bitmap softwares provides it (Alpha in Flash, Opacity in Fireworks),
but how is it done down to the API level?
The API only provides the blitting functions (bitbllt, stretchblt)
without any mechanism for transparency.

thanks.
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