diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc | 467 |
1 files changed, 10 insertions, 457 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc index 47416012c9d..9864064b112 100644 --- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc +++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc @@ -33,466 +33,20 @@ #include "hb-ot-cmap-table.hh" #include "hb-ot-cbdt-table.hh" #include "hb-ot-glyf-table.hh" -#include "hb-ot-head-table.hh" -#include "hb-ot-hhea-table.hh" #include "hb-ot-hmtx-table.hh" #include "hb-ot-kern-table.hh" -#include "hb-ot-os2-table.hh" #include "hb-ot-post-table.hh" -#include "hb-ot-var-hvar-table.hh" -struct hb_ot_face_metrics_accelerator_t -{ - unsigned int num_metrics; - unsigned int num_advances; - unsigned int default_advance; - unsigned short ascender; - unsigned short descender; - unsigned short line_gap; - bool has_font_extents; - - const OT::hmtxvmtx *table; - hb_blob_t *blob; - - const OT::HVARVVAR *var; - hb_blob_t *var_blob; - - inline void init (hb_face_t *face, - hb_tag_t _hea_tag, - hb_tag_t _mtx_tag, - hb_tag_t _var_tag, - hb_tag_t os2_tag, - unsigned int default_advance = 0) - { - this->default_advance = default_advance ? default_advance : face->get_upem (); - - bool got_font_extents = false; - if (os2_tag) - { - hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>::sanitize (face->reference_table (os2_tag)); - const OT::os2 *os2 = OT::Sanitizer<OT::os2>::lock_instance (os2_blob); -#define USE_TYPO_METRICS (1u<<7) - if (0 != (os2->fsSelection & USE_TYPO_METRICS)) - { - this->ascender = os2->sTypoAscender; - this->descender = os2->sTypoDescender; - this->line_gap = os2->sTypoLineGap; - got_font_extents = (this->ascender | this->descender) != 0; - } - hb_blob_destroy (os2_blob); - } - - hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag)); - const OT::_hea *_hea = OT::Sanitizer<OT::_hea>::lock_instance (_hea_blob); - this->num_advances = _hea->numberOfLongMetrics; - if (!got_font_extents) - { - this->ascender = _hea->ascender; - this->descender = _hea->descender; - this->line_gap = _hea->lineGap; - got_font_extents = (this->ascender | this->descender) != 0; - } - hb_blob_destroy (_hea_blob); - - this->has_font_extents = got_font_extents; - - this->blob = OT::Sanitizer<OT::hmtxvmtx>::sanitize (face->reference_table (_mtx_tag)); - - /* Cap num_metrics() and num_advances() based on table length. */ - unsigned int len = hb_blob_get_length (this->blob); - if (unlikely (this->num_advances * 4 > len)) - this->num_advances = len / 4; - this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2; - - /* We MUST set num_metrics to zero if num_advances is zero. - * Our get_advance() depends on that. */ - if (unlikely (!this->num_advances)) - { - this->num_metrics = this->num_advances = 0; - hb_blob_destroy (this->blob); - this->blob = hb_blob_get_empty (); - } - this->table = OT::Sanitizer<OT::hmtxvmtx>::lock_instance (this->blob); - - this->var_blob = OT::Sanitizer<OT::HVARVVAR>::sanitize (face->reference_table (_var_tag)); - this->var = OT::Sanitizer<OT::HVARVVAR>::lock_instance (this->var_blob); - } - - inline void fini (void) - { - hb_blob_destroy (this->blob); - hb_blob_destroy (this->var_blob); - } - - inline unsigned int get_advance (hb_codepoint_t glyph, - hb_font_t *font) const - { - if (unlikely (glyph >= this->num_metrics)) - { - /* If this->num_metrics is zero, it means we don't have the metrics table - * for this direction: return default advance. Otherwise, it means that the - * glyph index is out of bound: return zero. */ - if (this->num_metrics) - return 0; - else - return this->default_advance; - } - - return this->table->longMetric[MIN (glyph, (uint32_t) this->num_advances - 1)].advance - + this->var->get_advance_var (glyph, font->coords, font->num_coords); // TODO Optimize?! - } -}; - -struct hb_ot_face_glyf_accelerator_t -{ - bool short_offset; - unsigned int num_glyphs; - const OT::loca *loca; - const OT::glyf *glyf; - hb_blob_t *loca_blob; - hb_blob_t *glyf_blob; - unsigned int glyf_len; - - inline void init (hb_face_t *face) - { - hb_blob_t *head_blob = OT::Sanitizer<OT::head>::sanitize (face->reference_table (HB_OT_TAG_head)); - const OT::head *head = OT::Sanitizer<OT::head>::lock_instance (head_blob); - if ((unsigned int) head->indexToLocFormat > 1 || head->glyphDataFormat != 0) - { - /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */ - hb_blob_destroy (head_blob); - return; - } - this->short_offset = 0 == head->indexToLocFormat; - hb_blob_destroy (head_blob); - - this->loca_blob = OT::Sanitizer<OT::loca>::sanitize (face->reference_table (HB_OT_TAG_loca)); - this->loca = OT::Sanitizer<OT::loca>::lock_instance (this->loca_blob); - this->glyf_blob = OT::Sanitizer<OT::glyf>::sanitize (face->reference_table (HB_OT_TAG_glyf)); - this->glyf = OT::Sanitizer<OT::glyf>::lock_instance (this->glyf_blob); - - this->num_glyphs = MAX (1u, hb_blob_get_length (this->loca_blob) / (this->short_offset ? 2 : 4)) - 1; - this->glyf_len = hb_blob_get_length (this->glyf_blob); - } - - inline void fini (void) - { - hb_blob_destroy (this->loca_blob); - hb_blob_destroy (this->glyf_blob); - } - - inline bool get_extents (hb_codepoint_t glyph, - hb_glyph_extents_t *extents) const - { - if (unlikely (glyph >= this->num_glyphs)) - return false; - - unsigned int start_offset, end_offset; - if (this->short_offset) - { - start_offset = 2 * this->loca->u.shortsZ[glyph]; - end_offset = 2 * this->loca->u.shortsZ[glyph + 1]; - } - else - { - start_offset = this->loca->u.longsZ[glyph]; - end_offset = this->loca->u.longsZ[glyph + 1]; - } - - if (start_offset > end_offset || end_offset > this->glyf_len) - return false; - - if (end_offset - start_offset < OT::glyfGlyphHeader::static_size) - return true; /* Empty glyph; zero extents. */ - - const OT::glyfGlyphHeader &glyph_header = OT::StructAtOffset<OT::glyfGlyphHeader> (this->glyf, start_offset); - - extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax); - extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax); - extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing; - extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing; - - return true; - } -}; - -struct hb_ot_face_cbdt_accelerator_t -{ - hb_blob_t *cblc_blob; - hb_blob_t *cbdt_blob; - const OT::CBLC *cblc; - const OT::CBDT *cbdt; - - unsigned int cbdt_len; - unsigned int upem; - - inline void init (hb_face_t *face) - { - upem = face->get_upem(); - - cblc_blob = OT::Sanitizer<OT::CBLC>::sanitize (face->reference_table (HB_OT_TAG_CBLC)); - cbdt_blob = OT::Sanitizer<OT::CBDT>::sanitize (face->reference_table (HB_OT_TAG_CBDT)); - cbdt_len = hb_blob_get_length (cbdt_blob); - - if (hb_blob_get_length (cblc_blob) == 0) { - cblc = nullptr; - cbdt = nullptr; - return; /* Not a bitmap font. */ - } - cblc = OT::Sanitizer<OT::CBLC>::lock_instance (cblc_blob); - cbdt = OT::Sanitizer<OT::CBDT>::lock_instance (cbdt_blob); - - } - - inline void fini (void) - { - hb_blob_destroy (this->cblc_blob); - hb_blob_destroy (this->cbdt_blob); - } - - inline bool get_extents (hb_codepoint_t glyph, hb_glyph_extents_t *extents) const - { - unsigned int x_ppem = upem, y_ppem = upem; /* TODO Use font ppem if available. */ - - if (!cblc) - return false; // Not a color bitmap font. - - const OT::IndexSubtableRecord *subtable_record = this->cblc->find_table(glyph, &x_ppem, &y_ppem); - if (!subtable_record || !x_ppem || !y_ppem) - return false; - - if (subtable_record->get_extents (extents)) - return true; - - unsigned int image_offset = 0, image_length = 0, image_format = 0; - if (!subtable_record->get_image_data (glyph, &image_offset, &image_length, &image_format)) - return false; - - { - /* TODO Move the following into CBDT struct when adding more formats. */ - - if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length)) - return false; - - switch (image_format) - { - case 17: { - if (unlikely (image_length < OT::GlyphBitmapDataFormat17::min_size)) - return false; - - const OT::GlyphBitmapDataFormat17& glyphFormat17 = - OT::StructAtOffset<OT::GlyphBitmapDataFormat17> (this->cbdt, image_offset); - glyphFormat17.glyphMetrics.get_extents (extents); - } - break; - default: - // TODO: Support other image formats. - return false; - } - } - - /* Convert to the font units. */ - extents->x_bearing *= upem / (float) x_ppem; - extents->y_bearing *= upem / (float) y_ppem; - extents->width *= upem / (float) x_ppem; - extents->height *= upem / (float) y_ppem; - - return true; - } -}; - -struct hb_ot_face_post_accelerator_t -{ - hb_blob_t *post_blob; - OT::post::accelerator_t accel; - - inline void init (hb_face_t *face) - { - hb_blob_t *blob = this->post_blob = OT::Sanitizer<OT::post>::sanitize (face->reference_table (HB_OT_TAG_post)); - accel.init (OT::Sanitizer<OT::post>::lock_instance (blob), hb_blob_get_length (blob)); - } - - inline void fini (void) - { - accel.fini (); - hb_blob_destroy (this->post_blob); - } - - inline bool get_glyph_name (hb_codepoint_t glyph, - char *name, unsigned int size) const - { - return this->accel.get_glyph_name (glyph, name, size); - } - - inline bool get_glyph_from_name (const char *name, int len, - hb_codepoint_t *glyph) const - { - if (unlikely (!len)) - return false; - - return this->accel.get_glyph_from_name (name, len, glyph); - } -}; - -struct hb_ot_face_kern_accelerator_t -{ - hb_blob_t *kern_blob; - OT::kern::accelerator_t accel; - - inline void init (hb_face_t *face) - { - hb_blob_t *blob = this->kern_blob = OT::Sanitizer<OT::kern>::sanitize (face->reference_table (HB_OT_TAG_kern)); - accel.init (OT::Sanitizer<OT::kern>::lock_instance (blob), hb_blob_get_length (blob)); - } - - inline void fini (void) - { - accel.fini (); - hb_blob_destroy (this->kern_blob); - } - - inline int get_h_kerning (hb_codepoint_t left, hb_codepoint_t right) const - { return accel.get_h_kerning (left, right); } -}; - -typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj, - hb_codepoint_t codepoint, - hb_codepoint_t *glyph); - -template <typename Type> -static inline bool get_glyph_from (const void *obj, - hb_codepoint_t codepoint, - hb_codepoint_t *glyph) -{ - const Type *typed_obj = (const Type *) obj; - return typed_obj->get_glyph (codepoint, glyph); -} - -template <typename Type> -static inline bool get_glyph_from_symbol (const void *obj, - hb_codepoint_t codepoint, - hb_codepoint_t *glyph) -{ - const Type *typed_obj = (const Type *) obj; - if (likely (typed_obj->get_glyph (codepoint, glyph))) - return true; - - if (codepoint <= 0x00FFu) - { - /* For symbol-encoded OpenType fonts, we duplicate the - * U+F000..F0FF range at U+0000..U+00FF. That's what - * Windows seems to do, and that's hinted about at: - * http://www.microsoft.com/typography/otspec/recom.htm - * under "Non-Standard (Symbol) Fonts". */ - return typed_obj->get_glyph (0xF000u + codepoint, glyph); - } - - return false; -} - -struct hb_ot_face_cmap_accelerator_t -{ - hb_cmap_get_glyph_func_t get_glyph_func; - const void *get_glyph_data; - OT::CmapSubtableFormat4::accelerator_t format4_accel; - - const OT::CmapSubtableFormat14 *uvs_table; - hb_blob_t *blob; - - inline void init (hb_face_t *face) - { - this->blob = OT::Sanitizer<OT::cmap>::sanitize (face->reference_table (HB_OT_TAG_cmap)); - const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (this->blob); - const OT::CmapSubtable *subtable = nullptr; - const OT::CmapSubtableFormat14 *subtable_uvs = nullptr; - - bool symbol = false; - /* 32-bit subtables. */ - if (!subtable) subtable = cmap->find_subtable (3, 10); - if (!subtable) subtable = cmap->find_subtable (0, 6); - if (!subtable) subtable = cmap->find_subtable (0, 4); - /* 16-bit subtables. */ - if (!subtable) subtable = cmap->find_subtable (3, 1); - if (!subtable) subtable = cmap->find_subtable (0, 3); - if (!subtable) subtable = cmap->find_subtable (0, 2); - if (!subtable) subtable = cmap->find_subtable (0, 1); - if (!subtable) subtable = cmap->find_subtable (0, 0); - if (!subtable) - { - subtable = cmap->find_subtable (3, 0); - if (subtable) symbol = true; - } - /* Meh. */ - if (!subtable) subtable = &OT::Null(OT::CmapSubtable); - - /* UVS subtable. */ - if (!subtable_uvs) - { - const OT::CmapSubtable *st = cmap->find_subtable (0, 5); - if (st && st->u.format == 14) - subtable_uvs = &st->u.format14; - } - /* Meh. */ - if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtableFormat14); - - this->uvs_table = subtable_uvs; - - this->get_glyph_data = subtable; - if (unlikely (symbol)) - this->get_glyph_func = get_glyph_from_symbol<OT::CmapSubtable>; - else - switch (subtable->u.format) { - /* Accelerate format 4 and format 12. */ - default: this->get_glyph_func = get_glyph_from<OT::CmapSubtable>; break; - case 12: this->get_glyph_func = get_glyph_from<OT::CmapSubtableFormat12>; break; - case 4: - { - this->format4_accel.init (&subtable->u.format4); - this->get_glyph_data = &this->format4_accel; - this->get_glyph_func = this->format4_accel.get_glyph_func; - } - break; - } - } - - inline void fini (void) - { - hb_blob_destroy (this->blob); - } - - inline bool get_nominal_glyph (hb_codepoint_t unicode, - hb_codepoint_t *glyph) const - { - return this->get_glyph_func (this->get_glyph_data, unicode, glyph); - } - - inline bool get_variation_glyph (hb_codepoint_t unicode, - hb_codepoint_t variation_selector, - hb_codepoint_t *glyph) const - { - switch (this->uvs_table->get_glyph_variant (unicode, - variation_selector, - glyph)) - { - case OT::GLYPH_VARIANT_NOT_FOUND: return false; - case OT::GLYPH_VARIANT_FOUND: return true; - case OT::GLYPH_VARIANT_USE_DEFAULT: break; - } - - return get_nominal_glyph (unicode, glyph); - } -}; - struct hb_ot_font_t { - hb_ot_face_cmap_accelerator_t cmap; - hb_ot_face_metrics_accelerator_t h_metrics; - hb_ot_face_metrics_accelerator_t v_metrics; - OT::hb_lazy_loader_t<hb_ot_face_glyf_accelerator_t> glyf; - OT::hb_lazy_loader_t<hb_ot_face_cbdt_accelerator_t> cbdt; - OT::hb_lazy_loader_t<hb_ot_face_post_accelerator_t> post; - OT::hb_lazy_loader_t<hb_ot_face_kern_accelerator_t> kern; + OT::cmap::accelerator_t cmap; + OT::hmtx::accelerator_t h_metrics; + OT::vmtx::accelerator_t v_metrics; + OT::hb_lazy_loader_t<OT::glyf::accelerator_t> glyf; + OT::hb_lazy_loader_t<OT::CBDT::accelerator_t> cbdt; + OT::hb_lazy_loader_t<OT::post::accelerator_t> post; + OT::hb_lazy_loader_t<OT::kern::accelerator_t> kern; }; @@ -505,9 +59,8 @@ _hb_ot_font_create (hb_face_t *face) return nullptr; ot_font->cmap.init (face); - ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, HB_OT_TAG_HVAR, HB_OT_TAG_os2); - ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, HB_OT_TAG_VVAR, HB_TAG_NONE, - ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */ + ot_font->h_metrics.init (face); + ot_font->v_metrics.init (face, ot_font->h_metrics.ascender - ot_font->h_metrics.descender); /* TODO Can we do this lazily? */ ot_font->glyf.init (face); ot_font->cbdt.init (face); ot_font->post.init (face); @@ -688,7 +241,7 @@ retry: hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr); //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr); hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr); - //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr); TODO + //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr); hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr); hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr); |