[ot] Move hb_ot_face_metrics_accelerator_t
This commit is contained in:
Behdad Esfahbod
parent
f00a94e1ec
commit
a85d7ead04
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@ -37,113 +37,9 @@
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#include "hb-ot-hhea-table.hh"
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#include "hb-ot-hmtx-table.hh"
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#include "hb-ot-kern-table.hh"
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#include "hb-ot-os2-table.hh"
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#include "hb-ot-post-table.hh"
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#include "hb-ot-var-hvar-table.hh"
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struct hb_ot_face_metrics_accelerator_t
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{
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unsigned int num_metrics;
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unsigned int num_advances;
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unsigned int default_advance;
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unsigned short ascender;
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unsigned short descender;
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unsigned short line_gap;
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bool has_font_extents;
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const OT::hmtxvmtx *table;
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hb_blob_t *blob;
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const OT::HVARVVAR *var;
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hb_blob_t *var_blob;
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inline void init (hb_face_t *face,
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hb_tag_t _hea_tag,
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hb_tag_t _mtx_tag,
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hb_tag_t _var_tag,
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hb_tag_t os2_tag,
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unsigned int default_advance = 0)
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{
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this->default_advance = default_advance ? default_advance : face->get_upem ();
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bool got_font_extents = false;
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if (os2_tag)
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{
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hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>::sanitize (face->reference_table (os2_tag));
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const OT::os2 *os2 = OT::Sanitizer<OT::os2>::lock_instance (os2_blob);
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#define USE_TYPO_METRICS (1u<<7)
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if (0 != (os2->fsSelection & USE_TYPO_METRICS))
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{
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this->ascender = os2->sTypoAscender;
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this->descender = os2->sTypoDescender;
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this->line_gap = os2->sTypoLineGap;
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got_font_extents = (this->ascender | this->descender) != 0;
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}
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hb_blob_destroy (os2_blob);
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}
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hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (face->reference_table (_hea_tag));
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const OT::_hea *_hea = OT::Sanitizer<OT::_hea>::lock_instance (_hea_blob);
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this->num_advances = _hea->numberOfLongMetrics;
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if (!got_font_extents)
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{
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this->ascender = _hea->ascender;
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this->descender = _hea->descender;
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this->line_gap = _hea->lineGap;
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got_font_extents = (this->ascender | this->descender) != 0;
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}
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hb_blob_destroy (_hea_blob);
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this->has_font_extents = got_font_extents;
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this->blob = OT::Sanitizer<OT::hmtxvmtx>::sanitize (face->reference_table (_mtx_tag));
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/* Cap num_metrics() and num_advances() based on table length. */
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unsigned int len = hb_blob_get_length (this->blob);
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if (unlikely (this->num_advances * 4 > len))
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this->num_advances = len / 4;
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this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2;
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/* We MUST set num_metrics to zero if num_advances is zero.
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* Our get_advance() depends on that. */
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if (unlikely (!this->num_advances))
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{
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this->num_metrics = this->num_advances = 0;
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hb_blob_destroy (this->blob);
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this->blob = hb_blob_get_empty ();
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}
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this->table = OT::Sanitizer<OT::hmtxvmtx>::lock_instance (this->blob);
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this->var_blob = OT::Sanitizer<OT::HVARVVAR>::sanitize (face->reference_table (_var_tag));
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this->var = OT::Sanitizer<OT::HVARVVAR>::lock_instance (this->var_blob);
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}
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inline void fini (void)
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{
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hb_blob_destroy (this->blob);
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hb_blob_destroy (this->var_blob);
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}
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inline unsigned int get_advance (hb_codepoint_t glyph,
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hb_font_t *font) const
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{
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if (unlikely (glyph >= this->num_metrics))
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{
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/* If this->num_metrics is zero, it means we don't have the metrics table
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* for this direction: return default advance. Otherwise, it means that the
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* glyph index is out of bound: return zero. */
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if (this->num_metrics)
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return 0;
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else
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return this->default_advance;
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}
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return this->table->longMetric[MIN (glyph, (uint32_t) this->num_advances - 1)].advance
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+ this->var->get_advance_var (glyph, font->coords, font->num_coords); // TODO Optimize?!
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}
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};
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typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj,
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hb_codepoint_t codepoint,
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hb_codepoint_t *glyph);
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@ -275,8 +171,8 @@ struct hb_ot_face_cmap_accelerator_t
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struct hb_ot_font_t
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{
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hb_ot_face_cmap_accelerator_t cmap;
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hb_ot_face_metrics_accelerator_t h_metrics;
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hb_ot_face_metrics_accelerator_t v_metrics;
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OT::hmtxvmtx::accelerator_t h_metrics;
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OT::hmtxvmtx::accelerator_t v_metrics;
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OT::hb_lazy_loader_t<OT::glyf::accelerator_t> glyf;
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OT::hb_lazy_loader_t<OT::CBDT::accelerator_t> cbdt;
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OT::hb_lazy_loader_t<OT::post::accelerator_t> post;
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@ -28,6 +28,8 @@
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#define HB_OT_HMTX_TABLE_HH
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#include "hb-open-type-private.hh"
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#include "hb-ot-os2-table.hh"
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#include "hb-ot-var-hvar-table.hh"
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namespace OT {
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@ -63,7 +65,111 @@ struct hmtxvmtx
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return_trace (true);
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}
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public:
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struct accelerator_t
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{
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const hmtxvmtx *table;
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hb_blob_t *blob;
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const HVARVVAR *var;
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hb_blob_t *var_blob;
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inline void init (hb_face_t *face,
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hb_tag_t _hea_tag,
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hb_tag_t _mtx_tag,
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hb_tag_t _var_tag,
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hb_tag_t os2_tag,
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unsigned int default_advance = 0)
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{
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this->default_advance = default_advance ? default_advance : face->get_upem ();
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bool got_font_extents = false;
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if (os2_tag)
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{
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hb_blob_t *os2_blob = Sanitizer<os2>::sanitize (face->reference_table (os2_tag));
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const os2 *os2_table = Sanitizer<os2>::lock_instance (os2_blob);
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#define USE_TYPO_METRICS (1u<<7)
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if (0 != (os2_table->fsSelection & USE_TYPO_METRICS))
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{
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this->ascender = os2_table->sTypoAscender;
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this->descender = os2_table->sTypoDescender;
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this->line_gap = os2_table->sTypoLineGap;
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got_font_extents = (this->ascender | this->descender) != 0;
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}
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hb_blob_destroy (os2_blob);
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}
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hb_blob_t *_hea_blob = Sanitizer<_hea>::sanitize (face->reference_table (_hea_tag));
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const _hea *_hea_table = Sanitizer<_hea>::lock_instance (_hea_blob);
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this->num_advances = _hea_table->numberOfLongMetrics;
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if (!got_font_extents)
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{
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this->ascender = _hea_table->ascender;
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this->descender = _hea_table->descender;
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this->line_gap = _hea_table->lineGap;
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got_font_extents = (this->ascender | this->descender) != 0;
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}
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hb_blob_destroy (_hea_blob);
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this->has_font_extents = got_font_extents;
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this->blob = Sanitizer<hmtxvmtx>::sanitize (face->reference_table (_mtx_tag));
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/* Cap num_metrics() and num_advances() based on table length. */
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unsigned int len = hb_blob_get_length (this->blob);
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if (unlikely (this->num_advances * 4 > len))
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this->num_advances = len / 4;
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this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2;
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/* We MUST set num_metrics to zero if num_advances is zero.
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* Our get_advance() depends on that. */
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if (unlikely (!this->num_advances))
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{
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this->num_metrics = this->num_advances = 0;
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hb_blob_destroy (this->blob);
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this->blob = hb_blob_get_empty ();
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}
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this->table = Sanitizer<hmtxvmtx>::lock_instance (this->blob);
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this->var_blob = Sanitizer<HVARVVAR>::sanitize (face->reference_table (_var_tag));
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this->var = Sanitizer<HVARVVAR>::lock_instance (this->var_blob);
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}
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inline void fini (void)
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{
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hb_blob_destroy (this->blob);
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hb_blob_destroy (this->var_blob);
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}
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inline unsigned int get_advance (hb_codepoint_t glyph,
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hb_font_t *font) const
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{
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if (unlikely (glyph >= this->num_metrics))
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{
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/* If this->num_metrics is zero, it means we don't have the metrics table
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* for this direction: return default advance. Otherwise, it means that the
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* glyph index is out of bound: return zero. */
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if (this->num_metrics)
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return 0;
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else
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return this->default_advance;
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}
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return this->table->longMetric[MIN (glyph, (uint32_t) this->num_advances - 1)].advance
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+ this->var->get_advance_var (glyph, font->coords, font->num_coords); // TODO Optimize?!
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}
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public:
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bool has_font_extents;
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unsigned short ascender;
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unsigned short descender;
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unsigned short line_gap;
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private:
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unsigned int num_metrics;
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unsigned int num_advances;
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unsigned int default_advance;
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};
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protected:
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LongMetric longMetric[VAR]; /* Paired advance width and leading
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* bearing values for each glyph. The
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* value numOfHMetrics comes from
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