fz_halftone *fz_default_halftone(fz_context *ctx, int num_comps)
{
fz_halftone *ht = fz_new_halftone(ctx, num_comps);
fz_try(ctx)
{
int i;
for (i = 0; i < num_comps; i++)
ht->comp[i] = fz_new_pixmap_with_data(ctx, NULL, 16, 16, 1, 16, mono_ht);
}
fz_catch(ctx)
{
fz_drop_halftone(ctx, ht);
fz_rethrow(ctx);
}
return ht;
}
fz_bitmap *fz_halftone_pixmap(fz_context *ctx, fz_pixmap *pix, fz_halftone *ht)
{
fz_bitmap *out;
unsigned char *ht_line, *o, *p;
int w, h, x, y, n, pstride, ostride;
fz_halftone *ht_orig = ht;
if (!pix)
return NULL;
assert(pix->n == 2); /* Mono + Alpha */
n = pix->n-1; /* Remove alpha */
if (ht == NULL)
{
ht = fz_default_halftone(ctx, n);
}
ht_line = fz_malloc(ctx, pix->w * n);
out = fz_new_bitmap(ctx, pix->w, pix->h, n, pix->xres, pix->yres);
o = out->samples;
p = pix->samples;
h = pix->h;
x = pix->x;
y = pix->y;
w = pix->w;
ostride = out->stride;
pstride = pix->w * pix->n;
while (h--)
{
make_ht_line(ht_line, ht, x, y++, w);
do_threshold_1(ht_line, p, o, w);
o += ostride;
p += pstride;
}
if (!ht_orig)
fz_drop_halftone(ctx, ht);
return out;
}
