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Fix attribute clash quantization in update

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It would previously undershoot, not quantizing to an area fully
enclosing the unquantized area.

This solves issue #79
This commit is contained in:
Philip Linde 2018-05-31 19:43:33 +00:00
parent efe9f8406f
commit b6cebc4edf
1 changed files with 2 additions and 2 deletions
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src/graph.c
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@ -139,10 +139,10 @@ void Update_part_of_screen(short x, short y, short width, short height)
// Round up to a multiple of 8 pixels, because some special modes (ZX, Thomson, ...) can change // Round up to a multiple of 8 pixels, because some special modes (ZX, Thomson, ...) can change
// more pixels than expected (attribute clash) // more pixels than expected (attribute clash)
width = ((width + (x & 7)) | 7) + 1;
height = ((height + (y & 7)) | 7) + 1;
x &= 0xFFF8; x &= 0xFFF8;
y &= 0xFFF8; y &= 0xFFF8;
width = ((width - 1) | 0x7) + 1;
height = ((height - 1) | 0x7) + 1;
// Update "normal" view // Update "normal" view
diff = x-Main.offset_X; diff = x-Main.offset_X;