#include <stdlib.h>
+#include "common.h"
#include "shape.h"
void
exit(1);
}
+ s->area = 0;
s->w = img->w; s->h = img->h;
s->mw = ((img->w+31)>>5);
s->mask = malloc(4*s->mw*s->h);
bit = 0;
for(x=0; x<img->w; x++) {
if(!bit) { bits = 0; bit = 0x80000000; }
- if(*px++ != transp) bits |= bit;
+ if(*px++ != transp) { bits |= bit; s->area++; }
bit >>= 1;
if(!bit || x == img->w - 1) { *(p++) = bits; }
}
SDL_UnlockSurface(img);
}
-#ifndef max
-#define max(a, b) ((a) > (b) ? (a) : (b))
-#endif
-
-#ifndef min
-#define min(a, b) ((a) < (b) ? (a) : (b))
-#endif
-
-#ifndef abs
-#define abs(a) ((a)<=0 ? -(a) : (a))
-#endif
-
int
line_collide(int xov, struct shape *r, uint32_t *rbits, struct shape *s, uint32_t *sbits)
{
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;
+}