diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/OT/glyf/Glyph.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/OT/glyf/Glyph.hh | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/OT/glyf/Glyph.hh b/thirdparty/harfbuzz/src/OT/glyf/Glyph.hh new file mode 100644 index 0000000000..afcb5dc834 --- /dev/null +++ b/thirdparty/harfbuzz/src/OT/glyf/Glyph.hh @@ -0,0 +1,358 @@ +#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; + } + } + + 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 (all_points.length > 4) + { + glyph_header = (GlyphHeader *) hb_calloc (1, GlyphHeader::static_size); + if (unlikely (!glyph_header)) return false; + } + + int xMin, xMax; + xMin = xMax = roundf (all_points[0].x); + + int yMin, yMax; + 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 (all_points.length == 4) + 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 */) const + { + contour_point_vector_t all_points, deltas; + get_points (font, glyf, all_points, &deltas, false); + + 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; + } + + return compile_header_bytes (plan, all_points, dest_start); + } + + + /* 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 use_my_metrics = true, + 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 lsb = 0; + int h_delta = glyf_accelerator.hmtx->get_leading_bearing_without_var_unscaled (gid, &lsb) ? + (int) header->xMin - lsb : 0; + int tsb = 0; + int v_orig = (int) header->yMax + +#ifndef HB_NO_VERTICAL + ((void) glyf_accelerator.vmtx->get_leading_bearing_without_var_unscaled (gid, &tsb), tsb) +#else + 0 +#endif + ; + unsigned h_adv = glyf_accelerator.hmtx->get_advance_without_var_unscaled (gid); + unsigned v_adv = +#ifndef HB_NO_VERTICAL + glyf_accelerator.vmtx->get_advance_without_var_unscaled (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; + } + + if (deltas != nullptr && depth == 0 && type == COMPOSITE) + { + if (unlikely (!deltas->resize (points.length))) return false; + for (unsigned i = 0 ; i < points.length; i++) + deltas->arrayZ[i] = points.arrayZ[i]; + } + +#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; + } + } + + 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.get_gid ()) + .get_points (font, glyf_accelerator, comp_points, + deltas, use_my_metrics, phantom_only, depth + 1))) + return false; + + /* 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]; + + /* 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_without_var_scaled (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_without_var_scaled (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 */ |