3D Graphics Programming with QuickDraw 3D 1.5.4
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Buffer Compositing Modes
A drawing engine may support a buffer compositing mode that determines how the drawing engine composites generated pixels with the initial contents of the drawing buffer. You specify an engine's buffer compositing mode by assigning a value to its kQATag_BufferComposite state variable. The default value of this variable for a drawing engine that supports buffer compositing is kQABufferComposite_None . You can use the following constants to specify a buffer compositing mode.
#define kQABufferComposite_None 0
#define kQABufferComposite_PreMultiply 1
#define kQABufferComposite_Interpolate 2
Constant descriptions
- kQABufferComposite_None
- The drawing engine performs no compositing. Newly generated pixels overwrite the initial contexts of the buffer.
- kQABufferComposite_PreMultiply
- The drawing engine composites new pixels with existing pixels by premulitplying their color components.
- kQABufferComposite_Interpolate
- The drawing engine composites new pixels with existing pixels by interpolating their color components.
© 1997 Apple Computer, Inc.
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