mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-28 19:07:47 -04:00
Matthew Stanley
28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
#ifndef PSXRECOMP_WS_SCREEN_MASK_H
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#define PSXRECOMP_WS_SCREEN_MASK_H
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#include <stdint.h>
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/* Extend only an off-screen vertical boundary of a title-identified mask.
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* The interior/slanted light boundary stays at its original coordinates.
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* Result is wholly outside canonical VRAM; no triangle size limit applies. */
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typedef struct { int x, y, w, h; } WsScreenMaskBand;
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static inline int ws_screen_mask_band(const int32_t x[4], const int32_t y[4],
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int width, int height, int margin,
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WsScreenMaskBand *out) {
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if (!out || width <= 0 || height <= 0 || margin <= 0 ||
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y[0] != y[1] || y[2] != y[3] || y[0] != 0 || y[2] != height)
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return 0;
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if (x[0] == x[2] && x[0] <= 0 && x[1] > x[0] && x[3] > x[0] &&
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x[0] > -margin) {
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*out = (WsScreenMaskBand){-margin, 0, margin + x[0], height};
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return 1;
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}
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if (x[1] == x[3] && x[1] >= width && x[0] < x[1] && x[2] < x[1] &&
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x[1] < width + margin) {
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*out = (WsScreenMaskBand){x[1], 0, width + margin - x[1], height};
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return 1;
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}
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return 0;
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}
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#endif
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