vor: $(objects)
$(CC) $(ldflags) -o $@ $^ $(LIBRARIES)
-data/sprites/ship.png: ship.pov
- povray -GA -D +A +UA +W32 +H24 ship.pov >/dev/null 2>/dev/null
- mv ship.png data/sprites/
+pnmoutline: pnmoutline.c
+ $(CC) -lnetpbm -o $@ $<
+
+data/sprites/ship.png: ship.pov pnmoutline Makefile
+ povray -GA -D +A +UA +W32 +H32 $< >/dev/null 2>/dev/null
+ pngtopnm ship.png >ship.pnm
+ ./pnmoutline <ship.pnm >data/sprites/ship.pnm
+ pnmtopng -transparent =white data/sprites/ship.pnm >$@
+ rm ship.png ship.pnm data/sprites/ship.pnm
clean:
- rm -f *.o vor data/sprites/ship.png
+ rm -f *.o vor pnmoutline data/sprites/ship.png
install: all
if [ ! -d $(DATA_PREFIX) ]; then mkdir $(DATA_PREFIX); fi
--- /dev/null
+#include <pam.h>
+#include <string.h>
+
+struct pam inpam, outpam;
+tuple *inrows[3];
+tuple *outrow;
+
+void
+clear_inrow(struct pam *p, tuple *row)
+{
+ int i, j;
+
+ for(i=0; i<p->width; i++)
+ for(j=0; j<3; j++)
+ row[i][j]=0;
+}
+
+void
+clear_outrow(struct pam *p, tuple *row)
+{
+ int i,j;
+
+ for(i=0; i<p->width; i++)
+ for(j=0; j<3; j++)
+ row[i][j]=p->maxval;
+}
+
+int
+is_black(unsigned int row, unsigned int column)
+{
+
+ sample *s = inrows[row][column];
+ if(s[0]==0 && s[1]==0 && s[2]==0) return ~0;
+ else return 0;
+}
+
+int
+is_edge(unsigned int column)
+{
+ unsigned int n = 0;
+ if(is_black(0,column)) n++;
+ if(is_black(2,column)) n++;
+ if(is_black(1,column-1)) n++;
+ if(is_black(1,column+1)) n++;
+ return n==2 || n==3;
+}
+
+void
+set_white(unsigned int column)
+{
+ sample *s = outrow[column];
+ s[0]=255; s[1]=255; s[2]=255;
+}
+
+void
+set_black(unsigned int column)
+{
+ sample *s = outrow[column];
+ s[0]=0; s[1]=0; s[2]=0;
+}
+
+void
+copy_tuple(unsigned int column)
+{
+ sample *src, *dest;
+
+ src = inrows[1][column];
+ dest = outrow[column];
+ dest[0] = src[0];
+ dest[1] = src[1];
+ dest[2] = src[2];
+}
+
+void
+read_row(unsigned int q)
+{
+ memcpy(inrows[0], inrows[1], outpam.width*sizeof(sample)*3);
+ memcpy(inrows[1], inrows[2], outpam.width*sizeof(sample)*3);
+ if(q) pnm_readpamrow(&inpam, inrows[2]+1);
+ else clear_inrow(&outpam, inrows[2]);
+}
+
+
+int
+main(int argc, char **argv)
+{
+ unsigned int row,column,i;
+
+ pnm_init(&argc, argv);
+ pnm_readpaminit(stdin, &inpam, sizeof(struct pam));
+
+ outpam = inpam;
+ outpam.width+=2; outpam.height+=2;
+ outpam.file = stdout;
+ pnm_writepaminit(&outpam);
+
+ outrow = pnm_allocpamrow(&outpam);
+ for(i=0; i<3; i++) inrows[i] = pnm_allocpamrow(&outpam);
+ for(i=0; i<3; i++) clear_inrow(&outpam, inrows[i]);
+
+ clear_outrow(&outpam, outrow);
+ pnm_writepamrow(&outpam, inrows[0]);
+
+ pnm_readpamrow(&inpam, inrows[1]+1);
+ for(row=0; row < inpam.height; row++) {
+ for(column=1; column<=inpam.width; column++) {
+ if(is_black(1,column)) {
+ if(is_edge(column)) set_black(column);
+ else set_white(column);
+ } else copy_tuple(column);
+ }
+ pnm_writepamrow(&outpam, outrow);
+ read_row(row != inpam.height-1);
+ }
+
+ clear_outrow(&outpam, outrow);
+ pnm_writepamrow(&outpam, inrows[2]);
+
+ pnm_freepamrow(outrow);
+ for(i=0; i<3; i++) pnm_freepamrow(inrows[i]);
+ return 0;
+}