mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Matthew Stanley
27 lines
1.5 KiB
C
27 lines
1.5 KiB
C
#ifndef PSXRECOMP_MOD_VISIBLE_PLACEMENTS_H
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#define PSXRECOMP_MOD_VISIBLE_PLACEMENTS_H
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#include <stdint.h>
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/* Authored placement visibility, independent of a title's actor allocator.
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* Rectangles use the strict bounds of the original Capcom placement scan.
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* Caller stores its visited bitmap/previous rectangle in snapshotted mod RAM. */
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typedef struct PSXPlacementRect { int32_t left,right,top,bottom; } PSXPlacementRect;
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static inline int psx_placement_contains(PSXPlacementRect r,int32_t x,int32_t y) {
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return x>r.left && x<r.right && y>r.top && y<r.bottom;
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}
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/* Return only newly exposed strips. Overlapping edge coordinates are included
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* in the strip bounds because the original scanner excludes its endpoints. */
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static inline unsigned psx_placement_exposed(PSXPlacementRect old,PSXPlacementRect now,
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int valid,PSXPlacementRect out[4]) {
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if (!valid || now.left>=old.right || now.right<=old.left ||
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now.top>=old.bottom || now.bottom<=old.top) { out[0]=now;return 1; }
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unsigned n=0;
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if(now.left<old.left)out[n++]=(PSXPlacementRect){now.left,old.left+1,now.top,now.bottom};
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if(now.right>old.right)out[n++]=(PSXPlacementRect){old.right-1,now.right,now.top,now.bottom};
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int32_t left=now.left>old.left?now.left:old.left,right=now.right<old.right?now.right:old.right;
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if(now.top<old.top)out[n++]=(PSXPlacementRect){left,right,now.top,old.top+1};
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if(now.bottom>old.bottom)out[n++]=(PSXPlacementRect){left,right,old.bottom-1,now.bottom};
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return n;
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}
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#endif
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