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Fix off-by-one error in clipping_Xbitblt (#327)

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The LowerRightX and LowerRightY were calculated as the X and Y coordinates of the
pixel to the right and below the last visible pixel, but are compared with the
last actually visible pixel in the source. They need an extra -1 offset to correct.

Add comments to explain what's going on.  Fix the signature of the function to reflect
that the "dummy" passed for the display region is a pointer not an integer.
This commit is contained in:
Nick Briggs
2021-01-30 19:03:17 -08:00
committed by GitHub
parent 3764acda85
commit 1f17665741
2 changed files with 13 additions and 6 deletions
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2
inc/xbbtdefs.h
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@@ -1,4 +1,4 @@
#ifndef XBBTDEFS_H
#define XBBTDEFS_H 1
unsigned long clipping_Xbitblt(DspInterface dsp, int dummy, int x, int y, int w, int h);
unsigned long clipping_Xbitblt(DspInterface dsp, DLword *dummy, int x, int y, int w, int h);
#endif