(Added note about IOSurface caching) |
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Line 29: | Line 29: | ||
}; | }; | ||
</source> | </source> | ||
For best results, use an IOSurfaces that have the kIOSurfaceCacheMode property set to kIOMapInhibitCache. | |||
{{occlass|library=IOKit.framework|navbox=1}} | {{occlass|library=IOKit.framework|navbox=1}} |
Revision as of 12:34, 27 March 2010
AppleJPEGDriver is a kernel-extension providing accelerating encoding and decoding JPEG images via IOSurfaces, esp. for those with YUV color space. It powers the AppleJPEG for decoding, Camera for encoding, and Celestial for both.
Methods
Selector | Action | Input | Output |
---|---|---|---|
0 | initializeDecoder | - | - |
1 | startDecoder | struct JPEGDriverArgs (40 bytes) | 40 bytes of stuff |
2 | initializeEncoder | - | - |
3 | startEncoder | struct JPEGDriverArgs (40 bytes) | 40 bytes of stuff. |
where
struct JPEGDriverArgs {
int must_be_zero_1;
IOSurfaceID src_surface /*in*/;
size_t src_size /*in*/;
int must_be_zero_2;
IOSurfaceID dest_surface /*in*/;
size_t dest_size /*in*/;
size_t result_size /*out*/;
size_t dest_width /*in*/;
size_t dest_height /*in*/;
int quality /*in: 4 gives decent quality */;
};
For best results, use an IOSurfaces that have the kIOSurfaceCacheMode property set to kIOMapInhibitCache.
|