MDJVU_IMPLEMENT void mdjvu_bitmap_unpack_all_0_or_1
(mdjvu_bitmap_t b, unsigned char **data)
{
int32 i = 0, h = BMP->height;
for (i = 0; i < h; i++)
{
mdjvu_bitmap_unpack_row_0_or_1(b, data[i], i);
}
}
MDJVU_IMPLEMENT mdjvu_bitmap_t mdjvu_get_erosion_mask(mdjvu_bitmap_t bmp)
{
int32 w = mdjvu_bitmap_get_width(bmp);
int32 h = mdjvu_bitmap_get_height(bmp);
mdjvu_bitmap_t result = mdjvu_bitmap_create(w, h);
int32 i;
unsigned char *u, *t, *l, *r;
if (h < 3) return result;
u = (unsigned char *) malloc(w); /* upper row */
t = (unsigned char *) malloc(w); /* this row */
l = (unsigned char *) malloc(w); /* lower row */
r = (unsigned char *) malloc(w); /* result */
mdjvu_bitmap_unpack_row_0_or_1(bmp, t, 0);
mdjvu_bitmap_unpack_row_0_or_1(bmp, l, 1);
for (i = 1; i < h - 1; i++)
{
unsigned char *tmp = u;
u = t;
t = l;
l = tmp;
mdjvu_bitmap_unpack_row_0_or_1(bmp, l, i + 1);
get_erosion_candidates_in_a_row(r, u, t, l, w);
mdjvu_bitmap_pack_row(result, r, i);
}
free(u);
free(t);
free(l);
free(r);
return result;
}
MDJVU_IMPLEMENT void mdjvu_smooth(mdjvu_bitmap_t b)
{
int32 w = mdjvu_bitmap_get_width(b);
int32 h = mdjvu_bitmap_get_height(b);
int32 i;
unsigned char *u, *t, *l, *r;
if (h < 3) return;
u = (unsigned char *) calloc(w + 2, 1) + 1; /* upper row */
t = (unsigned char *) calloc(w + 2, 1) + 1; /* this row */
l = (unsigned char *) calloc(w + 2, 1) + 1; /* lower row */
r = (unsigned char *) malloc(w); /* result */
mdjvu_bitmap_unpack_row_0_or_1(b, l, 0);
for (i = 0; i < h; i++)
{
unsigned char *tmp = u;
u = t;
t = l;
l = tmp;
if (i + 1 < h)
mdjvu_bitmap_unpack_row_0_or_1(b, l, i + 1);
else
memset(l, 0, w);
smooth_row(r, u, t, l, w);
mdjvu_bitmap_pack_row(b, r, i);
}
free(u - 1);
free(t - 1);
free(l - 1);
free(r);
}
