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#include <stdio.h>
#include <string.h>
#include <ppm.h>
pixel **image;
int w, h;
pixval maxval;
int rtl = 0;
void save(int x1, int x2, int y1, int y2)
{
int y;
ppm_writeppminit(stdout, x2 - x1, y2 - y1, maxval, 0);
for (y = y1; y < y2; ++y)
ppm_writeppmrow(stdout, &image[y][x1], x2-x1, maxval, 0);
}
void dice_ltr(int y1, int y2)
{
int x, y, x0 = 0;
for (x = 0; x < w; ++x) {
for (y = y1; y < y2; ++y) {
pixel p = image[y][x];
if (p.r < maxval || p.g < maxval || p.b < maxval)
break;
}
if (y == y2) {
if (x > x0)
save(x0, x, y1, y2);
x0 = x + 1;
}
}
if (x > x0)
save(x0, x, y1, y2);
}
void dice_rtl(int y1, int y2)
{
int x, y, x0 = w-1;
for (x = w-1; x >= 0; --x) {
for (y = y1; y < y2; ++y) {
pixel p = image[y][x];
if (p.r < maxval || p.g < maxval || p.b < maxval)
break;
}
if (y == y2) {
if (x < x0)
save(x+1, x0+1, y1, y2);
x0 = x - 1;
}
}
if (x < x0)
save(x+1, x0+1, y1, y2);
}
void dice(int y1, int y2)
{
if (rtl)
dice_rtl(y1, y2);
else
dice_ltr(y1, y2);
}
void slice(void)
{
int x, y, y0 = 0;
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
pixel p = image[y][x];
if (p.r < maxval || p.g < maxval || p.b < maxval)
break;
}
if (x == w) {
if (y > y0)
dice(y0, y);
y0 = y + 1;
}
}
if (y > y0)
dice(y0, y);
}
int main(int argc, char **argv)
{
if (argc > 1 && !strcmp(argv[1], "-rtl"))
rtl = 1;
pm_init(argv[0], 0);
image = ppm_readppm(stdin, &w, &h, &maxval);
slice();
ppm_freearray(image, h);
return 0;
}
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