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[vor.git]
/
shape.c
diff --git
a/shape.c
b/shape.c
index
f457158
..
75424ef
100644
(file)
--- a/
shape.c
+++ b/
shape.c
@@
-108,3
+108,14
@@
collide(int xdiff, int ydiff, struct shape *r, struct shape *s)
if(xov == 0 || yov == 0) return 0; // bboxes hit?
else return mask_collide(xov, yov, r, s);
}
if(xov == 0 || yov == 0) return 0; // bboxes hit?
else return mask_collide(xov, yov, r, s);
}
+
+int
+pixel_collide(unsigned int xoff, unsigned int yoff, struct shape *r)
+{
+ uint32_t pmask;
+
+ if(xoff >= r->w || yoff >= r->h) return 0;
+
+ pmask = 0x80000000 >> (xoff&0x1f);
+ return r->mask[(yoff*r->mw) + (xoff>>5)] & pmask;
+}