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#ifndef OT_GLYF_GLYPH_HH
#define OT_GLYF_GLYPH_HH
#include "../../hb-open-type.hh"
#include "GlyphHeader.hh"
#include "SimpleGlyph.hh"
#include "CompositeGlyph.hh"
namespace OT {
struct glyf_accelerator_t;
namespace glyf_impl {
enum phantom_point_index_t
{
PHANTOM_LEFT = 0,
PHANTOM_RIGHT = 1,
PHANTOM_TOP = 2,
PHANTOM_BOTTOM = 3,
PHANTOM_COUNT = 4
};
struct Glyph
{
enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE };
public:
composite_iter_t get_composite_iterator () const
{
if (type != COMPOSITE) return composite_iter_t ();
return CompositeGlyph (*header, bytes).iter ();
}
const hb_bytes_t trim_padding () const
{
switch (type) {
case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding ();
case SIMPLE: return SimpleGlyph (*header, bytes).trim_padding ();
default: return bytes;
}
}
void drop_hints ()
{
switch (type) {
case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return;
case SIMPLE: SimpleGlyph (*header, bytes).drop_hints (); return;
default: return;
}
}
void set_overlaps_flag ()
{
switch (type) {
case COMPOSITE: CompositeGlyph (*header, bytes).set_overlaps_flag (); return;
case SIMPLE: SimpleGlyph (*header, bytes).set_overlaps_flag (); return;
default: return;
}
}
void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
{
switch (type) {
case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return;
case SIMPLE: SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;
default: return;
}
}
/* Note: Recursively calls itself.
* all_points includes phantom points
*/
template <typename accelerator_t>
bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator,
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 stack_points;
bool inplace = type == SIMPLE && all_points.length == 0;
/* Load into all_points if it's empty, as an optimization. */
contour_point_vector_t &points = inplace ? all_points : stack_points;
switch (type) {
case COMPOSITE:
{
/* pseudo component points for each component in composite glyph */
unsigned num_points = hb_len (CompositeGlyph (*header, bytes).iter ());
if (unlikely (!points.resize (num_points))) return false;
break;
}
case SIMPLE:
if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, phantom_only)))
return false;
break;
}
/* Init phantom points */
if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;
hb_array_t<contour_point_t> phantoms = points.sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
{
int h_delta = (int) header->xMin -
glyf_accelerator.hmtx->get_side_bearing (gid);
int v_orig = (int) header->yMax +
#ifndef HB_NO_VERTICAL
glyf_accelerator.vmtx->get_side_bearing (gid)
#else
0
#endif
;
unsigned h_adv = glyf_accelerator.hmtx->get_advance (gid);
unsigned v_adv =
#ifndef HB_NO_VERTICAL
glyf_accelerator.vmtx->get_advance (gid)
#else
- font->face->get_upem ()
#endif
;
phantoms[PHANTOM_LEFT].x = h_delta;
phantoms[PHANTOM_RIGHT].x = h_adv + h_delta;
phantoms[PHANTOM_TOP].y = v_orig;
phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;
}
#ifndef HB_NO_VAR
glyf_accelerator.gvar->apply_deltas_to_points (gid, font, points.as_array ());
#endif
switch (type) {
case SIMPLE:
if (!inplace)
all_points.extend (points.as_array ());
break;
case COMPOSITE:
{
contour_point_vector_t comp_points;
unsigned int comp_index = 0;
for (auto &item : get_composite_iterator ())
{
comp_points.reset ();
if (unlikely (!glyf_accelerator.glyph_for_gid (item.glyphIndex)
.get_points (font, glyf_accelerator, comp_points,
phantom_only, depth + 1)))
return false;
/* Copy phantom points from component if USE_MY_METRICS flag set */
if (item.is_use_my_metrics ())
for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];
/* Apply component transformation & translation */
item.transform_points (comp_points);
/* Apply translation from gvar */
comp_points.translate (points[comp_index]);
if (item.is_anchored ())
{
unsigned int p1, p2;
item.get_anchor_points (p1, p2);
if (likely (p1 < all_points.length && p2 < comp_points.length))
{
contour_point_t delta;
delta.init (all_points[p1].x - comp_points[p2].x,
all_points[p1].y - comp_points[p2].y);
comp_points.translate (delta);
}
}
all_points.extend (comp_points.sub_array (0, comp_points.length - PHANTOM_COUNT));
comp_index++;
}
all_points.extend (phantoms);
} break;
default:
all_points.extend (phantoms);
}
if (depth == 0) /* Apply at top level */
{
/* Undocumented rasterizer behavior:
* Shift points horizontally by the updated left side bearing
*/
contour_point_t delta;
delta.init (-phantoms[PHANTOM_LEFT].x, 0.f);
if (delta.x) all_points.translate (delta);
}
return !all_points.in_error ();
}
bool get_extents (hb_font_t *font, const glyf_accelerator_t &glyf_accelerator,
hb_glyph_extents_t *extents) const
{
if (type == EMPTY) return true; /* Empty glyph; zero extents. */
return header->get_extents (font, glyf_accelerator, gid, extents);
}
hb_bytes_t get_bytes () const { return bytes; }
Glyph (hb_bytes_t bytes_ = hb_bytes_t (),
hb_codepoint_t gid_ = (hb_codepoint_t) -1) : bytes (bytes_),
header (bytes.as<GlyphHeader> ()),
gid (gid_)
{
int num_contours = header->numberOfContours;
if (unlikely (num_contours == 0)) type = EMPTY;
else if (num_contours > 0) type = SIMPLE;
else type = COMPOSITE; /* negative numbers */
}
protected:
hb_bytes_t bytes;
const GlyphHeader *header;
hb_codepoint_t gid;
unsigned type;
};
} /* namespace glyf_impl */
} /* namespace OT */
#endif /* OT_GLYF_GLYPH_HH */
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