walkero
/
harfbuzz
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[paint-extents] Refactor code

This commit is contained in:
Behdad Esfahbod 2022-12-24 10:04:48 -07:00
parent f9081fc358
commit f8bf98798d
1 changed files with 51 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

111
src/hb-paint-extents.hh
View File

@ -36,7 +36,23 @@ typedef struct hb_extents_t
hb_extents_t (float xmin, float ymin, float xmax, float ymax) :
xmin (xmin), ymin (ymin), xmax (xmax), ymax (ymax) {}
bool is_empty () const { return xmin > xmax; }
bool is_empty () const { return xmin >= xmax || ymin >= ymax; }
void union_ (const hb_extents_t &o)
{
xmin = hb_min (xmin, o.xmin);
ymin = hb_min (ymin, o.ymin);
xmax = hb_max (xmax, o.xmax);
ymax = hb_max (ymax, o.ymax);
}
void intersect (const hb_extents_t &o)
{
xmin = hb_max (xmin, o.xmin);
ymin = hb_max (ymin, o.ymin);
xmax = hb_min (xmax, o.xmax);
ymax = hb_min (ymax, o.ymax);
}
float xmin = 0.f;
float ymin = 0.f;
@ -132,6 +148,37 @@ typedef struct hb_bounds_t
hb_bounds_t (const hb_extents_t &extents) :
status (extents.is_empty () ? EMPTY : BOUNDED), extents (extents) {}
void union_ (const hb_bounds_t &o)
{
if (o.status == UNBOUNDED)
status = UNBOUNDED;
else if (o.status == BOUNDED)
{
if (status == EMPTY)
*this = o;
else if (status == BOUNDED)
extents.union_ (o.extents);
}
}
void intersect (const hb_bounds_t &o)
{
if (o.status == EMPTY)
status = EMPTY;
else if (o.status == BOUNDED)
{
if (status == UNBOUNDED)
*this = o;
else if (status == BOUNDED)
{
extents.intersect (o.extents);
if (extents.xmin >= extents.xmax ||
extents.ymin >= extents.ymax)
status = EMPTY;
}
}
}
status_t status;
hb_extents_t extents;
} hb_bounds_t;
@ -208,76 +255,20 @@ struct hb_paint_extents_context_t {
break;
case HB_PAINT_COMPOSITE_MODE_SRC_IN:
case HB_PAINT_COMPOSITE_MODE_DEST_IN:
// Intersect
if (src_bounds.status == hb_bounds_t::EMPTY)
backdrop_bounds.status = hb_bounds_t::EMPTY;
else if (src_bounds.status == hb_bounds_t::BOUNDED)
{
if (backdrop_bounds.status == hb_bounds_t::UNBOUNDED)
backdrop_bounds = src_bounds;
else if (backdrop_bounds.status == hb_bounds_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::EMPTY;
}
}
backdrop_bounds.intersect (src_bounds);
break;
default:
// Union
if (src_bounds.status == hb_bounds_t::UNBOUNDED)
backdrop_bounds.status = hb_bounds_t::UNBOUNDED;
else if (src_bounds.status == hb_bounds_t::BOUNDED)
{
if (backdrop_bounds.status == hb_bounds_t::EMPTY)
backdrop_bounds = src_bounds;
else if (backdrop_bounds.status == hb_bounds_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);
}
}
backdrop_bounds.union_ (src_bounds);
break;
}
}
void paint ()
{
/* Union current clip bounds with current group bounds. */
const hb_bounds_t &clip = clips.tail ();
hb_bounds_t &group = groups.tail ();
if (clip.status == hb_bounds_t::EMPTY)
return; // Shouldn't happen
if (group.status == hb_bounds_t::UNBOUNDED)
return;
if (group.status == hb_bounds_t::EMPTY)
{
group = clip;
return;
}
/* Group is bounded now. Clip is not empty. */
if (clip.status == hb_bounds_t::UNBOUNDED)
{
group.status = hb_bounds_t::UNBOUNDED;
return;
}
/* Both are bounded. Union. */
group.extents.xmin = hb_min (group.extents.xmin, clip.extents.xmin);
group.extents.ymin = hb_min (group.extents.ymin, clip.extents.ymin);
group.extents.xmax = hb_max (group.extents.xmax, clip.extents.xmax);
group.extents.ymax = hb_max (group.extents.ymax, clip.extents.ymax);
group.union_ (clip);
}
hb_vector_t<hb_bounds_t> clips;