harfbuzz/src/OT/glyf/Glyph.hh

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#ifndef OT_GLYF_GLYPH_HH
#define OT_GLYF_GLYPH_HH
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#include "../../hb-open-type.hh"
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#include "GlyphHeader.hh"
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#include "SimpleGlyph.hh"
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#include "CompositeGlyph.hh"
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namespace OT {
struct glyf_accelerator_t;
namespace glyf_impl {
#ifndef HB_GLYF_MAX_POINTS
#define HB_GLYF_MAX_POINTS 10000
#endif
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enum phantom_point_index_t
{
PHANTOM_LEFT = 0,
PHANTOM_RIGHT = 1,
PHANTOM_TOP = 2,
PHANTOM_BOTTOM = 3,
PHANTOM_COUNT = 4
};
struct Glyph
{
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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 ();
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}
const hb_bytes_t trim_padding () const
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{
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;
}
}
void update_mtx (const hb_subset_plan_t *plan,
int xMin, int yMax,
const contour_point_vector_t &all_points) const
{
hb_codepoint_t new_gid = 0;
if (!plan->new_gid_for_old_gid (gid, &new_gid))
return;
unsigned len = all_points.length;
float leftSideX = all_points[len - 4].x;
float rightSideX = all_points[len - 3].x;
float topSideY = all_points[len - 2].y;
float bottomSideY = all_points[len - 1].y;
int hori_aw = roundf (rightSideX - leftSideX);
if (hori_aw < 0) hori_aw = 0;
int lsb = roundf (xMin - leftSideX);
plan->hmtx_map->set (new_gid, hb_pair (hori_aw, lsb));
int vert_aw = roundf (topSideY - bottomSideY);
if (vert_aw < 0) vert_aw = 0;
int tsb = roundf (topSideY - yMax);
plan->vmtx_map->set (new_gid, hb_pair (vert_aw, tsb));
}
bool compile_header_bytes (const hb_subset_plan_t *plan,
const contour_point_vector_t &all_points,
hb_bytes_t &dest_bytes /* OUT */) const
{
GlyphHeader *glyph_header = nullptr;
if (type != EMPTY && all_points.length > 4)
{
glyph_header = (GlyphHeader *) hb_calloc (1, GlyphHeader::static_size);
if (unlikely (!glyph_header)) return false;
}
int xMin = 0, xMax = 0;
int yMin = 0, yMax = 0;
if (all_points.length > 4)
{
xMin = xMax = roundf (all_points[0].x);
yMin = yMax = roundf (all_points[0].y);
}
for (unsigned i = 1; i < all_points.length - 4; i++)
{
float rounded_x = roundf (all_points[i].x);
float rounded_y = roundf (all_points[i].y);
xMin = hb_min (xMin, rounded_x);
xMax = hb_max (xMax, rounded_x);
yMin = hb_min (yMin, rounded_y);
yMax = hb_max (yMax, rounded_y);
}
update_mtx (plan, xMin, yMax, all_points);
/*for empty glyphs: all_points only include phantom points.
*just update metrics and then return */
if (!glyph_header)
return true;
glyph_header->numberOfContours = header->numberOfContours;
glyph_header->xMin = xMin;
glyph_header->yMin = yMin;
glyph_header->xMax = xMax;
glyph_header->yMax = yMax;
dest_bytes = hb_bytes_t ((const char *)glyph_header, GlyphHeader::static_size);
return true;
}
bool compile_bytes_with_deltas (const hb_subset_plan_t *plan,
hb_font_t *font,
const glyf_accelerator_t &glyf,
hb_bytes_t &dest_start, /* IN/OUT */
hb_bytes_t &dest_end /* OUT */)
{
contour_point_vector_t all_points, deltas;
if (!get_points (font, glyf, all_points, &deltas, false, false))
return false;
// .notdef, set type to empty so we only update metrics and don't compile bytes for
// it
if (gid == 0 &&
!(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE))
type = EMPTY;
switch (type) {
case COMPOSITE:
if (!CompositeGlyph (*header, bytes).compile_bytes_with_deltas (dest_start,
deltas,
dest_end))
return false;
break;
case SIMPLE:
if (!SimpleGlyph (*header, bytes).compile_bytes_with_deltas (all_points,
plan->flags & HB_SUBSET_FLAGS_NO_HINTING,
dest_end))
return false;
break;
default:
/* set empty bytes for empty glyph
* do not use source glyph's pointers */
dest_start = hb_bytes_t ();
dest_end = hb_bytes_t ();
break;
}
if (!compile_header_bytes (plan, all_points, dest_start))
{
dest_end.fini ();
return false;
}
return true;
}
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/* 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 */,
contour_point_vector_t *deltas = nullptr, /* OUT */
bool shift_points_hori = true,
bool use_my_metrics = true,
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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;
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/* Load into all_points if it's empty, as an optimization. */
contour_point_vector_t &points = inplace ? all_points : stack_points;
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switch (type) {
case COMPOSITE:
{
/* pseudo component points for each component in composite glyph */
unsigned num_points = hb_len (CompositeGlyph (*header, bytes).iter ());
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if (unlikely (!points.resize (num_points))) return false;
break;
}
case SIMPLE:
if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, phantom_only)))
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return false;
break;
}
/* Init phantom points */
if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;
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hb_array_t<contour_point_t> phantoms = points.as_array ().sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
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{
int lsb = 0;
int h_delta = glyf_accelerator.hmtx->get_leading_bearing_without_var_unscaled (gid, &lsb) ?
(int) header->xMin - lsb : 0;
int tsb = 0;
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int v_orig = (int) header->yMax +
#ifndef HB_NO_VERTICAL
((void) glyf_accelerator.vmtx->get_leading_bearing_without_var_unscaled (gid, &tsb), tsb)
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#else
0
#endif
;
unsigned h_adv = glyf_accelerator.hmtx->get_advance_without_var_unscaled (gid);
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unsigned v_adv =
#ifndef HB_NO_VERTICAL
glyf_accelerator.vmtx->get_advance_without_var_unscaled (gid)
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#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;
}
if (deltas != nullptr && depth == 0 && type == COMPOSITE)
{
if (unlikely (!deltas->resize (points.length))) return false;
deltas->copy_vector (points);
}
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#ifndef HB_NO_VAR
glyf_accelerator.gvar->apply_deltas_to_points (gid, font, points.as_array ());
#endif
// mainly used by CompositeGlyph calculating new X/Y offset value so no need to extend it
// with child glyphs' points
if (deltas != nullptr && depth == 0 && type == COMPOSITE)
{
for (unsigned i = 0 ; i < points.length; i++)
{
deltas->arrayZ[i].x = points.arrayZ[i].x - deltas->arrayZ[i].x;
deltas->arrayZ[i].y = points.arrayZ[i].y - deltas->arrayZ[i].y;
}
}
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switch (type) {
case SIMPLE:
if (!inplace)
all_points.extend (points.as_array ());
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break;
case COMPOSITE:
{
contour_point_vector_t comp_points;
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unsigned int comp_index = 0;
for (auto &item : get_composite_iterator ())
{
comp_points.reset ();
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if (unlikely (!glyf_accelerator.glyph_for_gid (item.get_gid ())
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.get_points (font, glyf_accelerator, comp_points,
deltas, shift_points_hori, use_my_metrics, phantom_only, depth + 1)))
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return false;
/* 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);
}
}
/* Copy phantom points from component if USE_MY_METRICS flag set */
if (use_my_metrics && item.is_use_my_metrics ())
for (unsigned int i = 0; i < PHANTOM_COUNT; i++)
phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];
if (all_points.length > HB_GLYF_MAX_POINTS)
return false;
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all_points.extend (comp_points.as_array ().sub_array (0, comp_points.length - PHANTOM_COUNT));
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comp_index++;
}
all_points.extend (phantoms);
} break;
default:
all_points.extend (phantoms);
}
if (depth == 0 && shift_points_hori) /* Apply at top level */
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{
/* 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 ();
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}
bool get_extents_without_var_scaled (hb_font_t *font, const glyf_accelerator_t &glyf_accelerator,
hb_glyph_extents_t *extents) const
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{
if (type == EMPTY) return true; /* Empty glyph; zero extents. */
return header->get_extents_without_var_scaled (font, glyf_accelerator, gid, extents);
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}
hb_bytes_t get_bytes () const { return bytes; }
Glyph () : bytes (),
header (bytes.as<GlyphHeader> ()),
gid (-1),
type(EMPTY)
{}
Glyph (hb_bytes_t bytes_,
hb_codepoint_t gid_ = (unsigned) -1) : bytes (bytes_),
header (bytes.as<GlyphHeader> ()),
gid (gid_)
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{
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;
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hb_codepoint_t gid;
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unsigned type;
};
} /* namespace glyf_impl */
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} /* namespace OT */
#endif /* OT_GLYF_GLYPH_HH */