22 lines
475 B
C
22 lines
475 B
C
#include <internals/display.h>
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#include <display.h>
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/*
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dreverse_area()
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Reverses an area of the vram. This function is a simple application of
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the rectangle masks concept. (x1, y1) and (x2, y2) are reversed as
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well.
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*/
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void dreverse_area(int x1, int y1, int x2, int y2)
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{
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uint32_t masks[4];
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adjustRectangle(&x1, &y1, &x2, &y2);
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getMasks(x1, x2, masks);
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int begin = y1 << 2;
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int end = (y2 + 1) << 2;
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int i;
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for(i = begin; i < end; i++) vram[i] ^= masks[i & 3];
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}
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