diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc')
-rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc | 108 |
1 files changed, 97 insertions, 11 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc b/src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc index 2af2f54a75..69d2503abb 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-font.cc @@ -31,6 +31,8 @@ #include "hb-font-private.hh" #include "hb-ot-cmap-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" @@ -45,9 +47,9 @@ struct hb_ot_face_metrics_accelerator_t inline void init (hb_face_t *face, hb_tag_t _hea_tag, hb_tag_t _mtx_tag, - unsigned int default_advance) + unsigned int default_advance_) { - this->default_advance = default_advance; + this->default_advance = default_advance_; this->num_metrics = face->get_num_glyphs (); hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag)); @@ -57,7 +59,7 @@ struct hb_ot_face_metrics_accelerator_t this->blob = OT::Sanitizer<OT::_mtx>::sanitize (face->reference_table (_mtx_tag)); if (unlikely (!this->num_advances || - 2 * (this->num_advances + this->num_metrics) < hb_blob_get_length (this->blob))) + 2 * (this->num_advances + this->num_metrics) > hb_blob_get_length (this->blob))) { this->num_metrics = this->num_advances = 0; hb_blob_destroy (this->blob); @@ -76,8 +78,8 @@ struct hb_ot_face_metrics_accelerator_t 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 one EM. Otherwise, it means that the glyph - * index is out of bound: return zero. */ + * 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 @@ -91,6 +93,79 @@ struct hb_ot_face_metrics_accelerator_t } }; +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_cmap_accelerator_t { const OT::CmapSubtable *table; @@ -114,6 +189,7 @@ struct hb_ot_face_cmap_accelerator_t 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); /* Meh. */ if (!subtable) subtable = &OT::Null(OT::CmapSubtable); @@ -157,14 +233,14 @@ 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; + hb_ot_face_glyf_accelerator_t glyf; }; static hb_ot_font_t * -_hb_ot_font_create (hb_font_t *font) +_hb_ot_font_create (hb_face_t *face) { hb_ot_font_t *ot_font = (hb_ot_font_t *) calloc (1, sizeof (hb_ot_font_t)); - hb_face_t *face = font->face; if (unlikely (!ot_font)) return NULL; @@ -174,6 +250,7 @@ _hb_ot_font_create (hb_font_t *font) ot_font->cmap.init (face); ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, upem>>1); ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, upem); /* TODO Can we do this lazily? */ + ot_font->glyf.init (face); return ot_font; } @@ -184,6 +261,7 @@ _hb_ot_font_destroy (hb_ot_font_t *ot_font) ot_font->cmap.fini (); ot_font->h_metrics.fini (); ot_font->v_metrics.fini (); + ot_font->glyf.fini (); free (ot_font); } @@ -219,7 +297,7 @@ hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED, void *user_data HB_UNUSED) { const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data; - return font->em_scale_y (-ot_font->v_metrics.get_advance (glyph)); + return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph)); } static hb_bool_t @@ -275,8 +353,13 @@ hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED, hb_glyph_extents_t *extents, void *user_data HB_UNUSED) { - /* TODO */ - return false; + const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data; + bool ret = ot_font->glyf.get_extents (glyph, extents); + extents->x_bearing = font->em_scale_x (extents->x_bearing); + extents->y_bearing = font->em_scale_y (extents->y_bearing); + extents->width = font->em_scale_x (extents->width); + extents->height = font->em_scale_y (extents->height); + return ret; } static hb_bool_t @@ -334,10 +417,13 @@ _hb_ot_get_font_funcs (void) } +/** + * Since: 0.9.28 + **/ void hb_ot_font_set_funcs (hb_font_t *font) { - hb_ot_font_t *ot_font = _hb_ot_font_create (font); + hb_ot_font_t *ot_font = _hb_ot_font_create (font->face); if (unlikely (!ot_font)) return; |