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[paint-extents] Finish off 

Untested and unused.
This commit is contained in:
Behdad Esfahbod 2022-12-23 15:37:16 -07:00
parent 8ca78d1520
commit 7fbaaebe8b
1 changed files with 56 additions and 5 deletions
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61
src/hb-paint-extents.hh
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@ -169,9 +169,62 @@ struct hb_paint_extents_context_t {
groups.push (hb_bounds_t{hb_bounds_t::status_t::EMPTY});
}
hb_bounds_t pop_group ()
void pop_group (hb_paint_composite_mode_t mode)
{
return groups.pop ();
const hb_bounds_t src_bounds = groups.pop ();
hb_bounds_t &backdrop_bounds = groups.tail ();
switch ((int) mode)
{
case HB_PAINT_COMPOSITE_MODE_CLEAR:
backdrop_bounds.status = hb_bounds_t::status_t::EMPTY;
break;
case HB_PAINT_COMPOSITE_MODE_SRC:
case HB_PAINT_COMPOSITE_MODE_SRC_OUT:
backdrop_bounds = src_bounds;
break;
case HB_PAINT_COMPOSITE_MODE_DEST:
case HB_PAINT_COMPOSITE_MODE_DEST_OUT:
break;
case HB_PAINT_COMPOSITE_MODE_SRC_IN:
case HB_PAINT_COMPOSITE_MODE_DEST_IN:
// Intersect
if (src_bounds.status == hb_bounds_t::status_t::EMPTY)
backdrop_bounds.status = hb_bounds_t::status_t::EMPTY;
else if (src_bounds.status == hb_bounds_t::status_t::BOUNDED)
{
if (backdrop_bounds.status == hb_bounds_t::status_t::UNBOUNDED)
backdrop_bounds = src_bounds;
else if (backdrop_bounds.status == hb_bounds_t::status_t::BOUNDED)
{
backdrop_bounds.extents.xmin = hb_max (backdrop_bounds.extents.xmin, src_bounds.extents.xmin);
backdrop_bounds.extents.ymin = hb_max (backdrop_bounds.extents.ymin, src_bounds.extents.ymin);
backdrop_bounds.extents.xmax = hb_min (backdrop_bounds.extents.xmax, src_bounds.extents.xmax);
backdrop_bounds.extents.ymax = hb_min (backdrop_bounds.extents.ymax, src_bounds.extents.ymax);
if (backdrop_bounds.extents.xmin >= backdrop_bounds.extents.xmax ||
backdrop_bounds.extents.ymin >= backdrop_bounds.extents.ymax)
backdrop_bounds.status = hb_bounds_t::status_t::EMPTY;
}
}
break;
default:
// Union
if (src_bounds.status == hb_bounds_t::status_t::UNBOUNDED)
backdrop_bounds.status = hb_bounds_t::status_t::UNBOUNDED;
else if (src_bounds.status == hb_bounds_t::status_t::BOUNDED)
{
if (backdrop_bounds.status == hb_bounds_t::status_t::EMPTY)
backdrop_bounds = src_bounds;
else if (backdrop_bounds.status == hb_bounds_t::status_t::BOUNDED)
{
backdrop_bounds.extents.xmin = hb_min (backdrop_bounds.extents.xmin, src_bounds.extents.xmin);
backdrop_bounds.extents.ymin = hb_min (backdrop_bounds.extents.ymin, src_bounds.extents.ymin);
backdrop_bounds.extents.xmax = hb_max (backdrop_bounds.extents.xmax, src_bounds.extents.xmax);
backdrop_bounds.extents.ymax = hb_max (backdrop_bounds.extents.ymax, src_bounds.extents.ymax);
}
}
break;
}
}
void paint ()
@ -293,9 +346,7 @@ hb_paint_extents_pop_group (hb_paint_funcs_t *funcs HB_UNUSED,
{
hb_paint_extents_context_t *c = (hb_paint_extents_context_t *) paint_data;
hb_bounds_t bounds = c->pop_group ();
// TODO
c->pop_group (mode);
}
static void