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[directfb-cvs] DirectFB

CVSROOT:	/cvs/directfb
Module name:	DirectFB
Changes by:	dok	20041026 15:44:20

Modified files:
	src/core       : gfxcard.c gfxcard.h 
	src/display    : idirectfbsurface.c 

Log message:
Cleaned up tile blitting a bit.

Two steps added for performance:
- Check if anything is drawn at all before looping through tiles.
- Modify coordinates to exclude fully clipped tiles from loops.

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