forked from Lephenixnoir/gint
25 lines
568 B
C
25 lines
568 B
C
#include <gint/defs/util.h>
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#include "render-fx.h"
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void masks(int x1, int x2, uint32_t *masks)
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{
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x1 = max(x1, dwindow.left);
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x2 = min(x2, dwindow.right - 1);
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/* Indexes of the first and last non-empty longs */
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size_t l1 = x1 >> 5;
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size_t l2 = x2 >> 5;
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size_t i = 0;
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while(i < l1) masks[i++] = 0x00000000;
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while(i <= l2) masks[i++] = 0xffffffff;
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while(i < 4) masks[i++] = 0x00000000;
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/* Remove the index information in x1 and x2; keep only the offsets */
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x1 &= 31;
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x2 = ~x2 & 31;
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masks[l1] &= (0xffffffffu >> x1);
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masks[l2] &= (0xffffffffu << x2);
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}
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