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[glyf] do a phantom only iteration when possible

This commit is contained in:
Ebrahim Byagowi 2020-02-18 13:55:28 +03:30
parent 11f3fca01d
commit 5c03fbe7e0
1 changed files with 32 additions and 18 deletions
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50
src/hb-ot-glyf-table.hh
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@ -633,8 +633,7 @@ struct glyf
void drop_hints_bytes (hb_bytes_t &dest_start) const
{ dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); }
bool get_contour_points (contour_point_vector_t &points_ /* OUT */,
bool phantom_only = false) const
bool get_contour_points (contour_point_vector_t &points_ /* OUT */) const
{
/* add one pseudo point for each component in composite glyph */
unsigned int num_points = hb_len (get_iterator ());
@ -696,7 +695,7 @@ struct glyf
bool get_contour_points (contour_point_vector_t &points_ /* OUT */, bool phantom_only = false) const
{
switch (type) {
case COMPOSITE: return CompositeGlyph (*header, bytes).get_contour_points (points_, phantom_only);
case COMPOSITE: return CompositeGlyph (*header, bytes).get_contour_points (points_);
case SIMPLE: return SimpleGlyph (*header, bytes).get_contour_points (points_, phantom_only);
default:
/* empty glyph */
@ -825,14 +824,16 @@ struct glyf
bool _get_points (hb_codepoint_t gid,
const int *coords, unsigned int coord_count,
contour_point_vector_t &all_points /* OUT */,
bool phantom_only = false,
unsigned int depth = 0) const
{
if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return false;
contour_point_vector_t points;
const Glyph &glyph = glyph_for_gid (gid);
if (unlikely (!glyph.get_contour_points (points))) return false;
if (unlikely (!glyph.get_contour_points (points, phantom_only))) return false;
hb_array_t<contour_point_t> phantoms = points.sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
init_phantom_points (gid, phantoms);
#ifndef HB_NO_VAR
if (unlikely (!face->table.gvar->apply_deltas_to_points (gid, coords, coord_count, points.as_array ()))) return false;
#endif
@ -846,7 +847,7 @@ struct glyf
{
contour_point_vector_t comp_points;
if (unlikely (!_get_points (item.glyphIndex, coords, coord_count,
comp_points, depth))
comp_points, phantom_only, depth))
|| comp_points.length < PHANTOM_COUNT)
return false;
@ -890,9 +891,16 @@ struct glyf
template<typename T>
bool get_points (hb_font_t *font, hb_codepoint_t gid, T consumer) const
{
/* Making this alloc free is not that easy
https://github.com/harfbuzz/harfbuzz/issues/2095
mostly because of gvar handling in VF fonts,
perhaps a separate path for non-VF fonts can be considered */
contour_point_vector_t all_points;
if (unlikely (!_get_points (gid, font->coords, font->num_coords, all_points) ||
all_points.length < PHANTOM_COUNT)) return false;
bool phantom_only = !consumer.is_consuming_contour_points ();
if (unlikely (!_get_points (gid, font->coords, font->num_coords, all_points, phantom_only) ||
all_points.length < PHANTOM_COUNT))
return false;
/* Undocumented rasterizer behavior:
* Shift points horizontally by the updated left side bearing
@ -901,9 +909,12 @@ struct glyf
delta.init (-all_points[all_points.length - PHANTOM_COUNT + PHANTOM_LEFT].x, 0.f);
if (delta.x) all_points.translate (delta);
for (unsigned point_index = 0; point_index + 4 < all_points.length; ++point_index)
consumer.consume_point (all_points[point_index]);
consumer.points_end ();
if (consumer.is_consuming_contour_points ())
{
for (unsigned point_index = 0; point_index + 4 < all_points.length; ++point_index)
consumer.consume_point (all_points[point_index]);
consumer.points_end ();
}
for (unsigned i = 0; i < PHANTOM_COUNT; ++i)
consumer.consume_phantom (all_points[all_points.length - PHANTOM_COUNT + i], i);
@ -912,14 +923,14 @@ struct glyf
}
#ifndef HB_NO_VAR
struct extents_bounds_aggregator_t
struct points_aggregator_t
{
hb_font_t *font;
hb_glyph_extents_t *extents;
contour_point_vector_t *phantoms;
contour_bounds_t bounds;
extents_bounds_aggregator_t (hb_font_t *font_, hb_glyph_extents_t *extents_, contour_point_vector_t *phantoms_)
points_aggregator_t (hb_font_t *font_, hb_glyph_extents_t *extents_, contour_point_vector_t *phantoms_)
{
font = font_;
extents = extents_;
@ -927,11 +938,13 @@ struct glyf
if (extents) bounds = contour_bounds_t ();
}
void consume_point (const contour_point_t &point) { if (extents) bounds.add (point); }
void points_end () { if (extents) bounds.get_extents (font, extents); }
void consume_point (const contour_point_t &point) { bounds.add (point); }
void points_end () { bounds.get_extents (font, extents); }
void consume_phantom (const contour_point_t &point, unsigned i)
{ if (phantoms) (*phantoms)[i] = point; }
bool is_consuming_contour_points () { return extents; }
};
#endif
@ -945,7 +958,7 @@ struct glyf
phantoms.resize (PHANTOM_COUNT);
if (likely (font->num_coords == face->table.gvar->get_axis_count ()))
success = get_points (font, gid, extents_bounds_aggregator_t (font, nullptr, &phantoms));
success = get_points (font, gid, points_aggregator_t (font, nullptr, &phantoms));
if (unlikely (!success))
return is_vertical ? face->table.vmtx->get_advance (gid) : face->table.hmtx->get_advance (gid);
@ -962,7 +975,7 @@ struct glyf
contour_point_vector_t phantoms;
phantoms.resize (PHANTOM_COUNT);
if (unlikely (!get_points (font, gid, extents_bounds_aggregator_t (font, &extents, &phantoms))))
if (unlikely (!get_points (font, gid, points_aggregator_t (font, &extents, &phantoms))))
return is_vertical ? face->table.vmtx->get_side_bearing (gid) : face->table.hmtx->get_side_bearing (gid);
return is_vertical ? ceil (phantoms[PHANTOM_TOP].y) - extents.y_bearing : floor (phantoms[PHANTOM_LEFT].x);
@ -975,7 +988,7 @@ struct glyf
unsigned int coord_count;
const int *coords = hb_font_get_var_coords_normalized (font, &coord_count);
if (coords && coord_count > 0 && coord_count == face->table.gvar->get_axis_count ())
return get_points (font, gid, extents_bounds_aggregator_t (font, extents, nullptr));
return get_points (font, gid, points_aggregator_t (font, extents, nullptr));
#endif
if (unlikely (gid >= num_glyphs)) return false;
@ -1193,8 +1206,9 @@ struct glyf
}
}
void points_end () {}
void consume_phantom (const contour_point_t &point HB_UNUSED, unsigned i HB_UNUSED) {}
bool is_consuming_contour_points () { return true; }
};
bool