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authorAkira Kakuto <kakuto@fuk.kindai.ac.jp>2015-12-28 13:04:03 +0000
committerAkira Kakuto <kakuto@fuk.kindai.ac.jp>2015-12-28 13:04:03 +0000
commit74c0c4d1d90ea4f85a3de0304bcd009cb29acf9d (patch)
treee372a73826b75e2c70c80b6a903e9a9e60f928d4 /Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc
parentcf483bef74e67ba3d39108df4864121c887f95e6 (diff)
harfbuzz-1.1.2
git-svn-id: svn://tug.org/texlive/trunk@39213 c570f23f-e606-0410-a88d-b1316a301751
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.cc388
1 files changed, 388 insertions, 0 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
new file mode 100644
index 00000000000..58586bfa48f
--- /dev/null
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-font.cc
@@ -0,0 +1,388 @@
+/*
+ * Copyright © 2011,2014 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod, Roozbeh Pournader
+ */
+
+#include "hb-private.hh"
+
+#include "hb-ot.h"
+
+#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"
+
+
+struct hb_ot_face_metrics_accelerator_t
+{
+ unsigned int num_metrics;
+ unsigned int num_advances;
+ unsigned int default_advance;
+ const OT::_mtx *table;
+ hb_blob_t *blob;
+
+ inline void init (hb_face_t *face,
+ hb_tag_t _hea_tag, hb_tag_t _mtx_tag)
+ {
+ this->default_advance = face->get_upem ();
+
+ 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;
+ hb_blob_destroy (_hea_blob);
+
+ this->blob = OT::Sanitizer<OT::_mtx>::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::_mtx>::lock_instance (this->blob);
+ }
+
+ inline void fini (void)
+ {
+ hb_blob_destroy (this->blob);
+ }
+
+ inline unsigned int get_advance (hb_codepoint_t glyph) 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;
+ }
+
+ if (glyph >= this->num_advances)
+ glyph = this->num_advances - 1;
+
+ return this->table->longMetric[glyph].advance;
+ }
+};
+
+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;
+ const OT::CmapSubtable *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 = NULL;
+ const OT::CmapSubtable *subtable_uvs = NULL;
+
+ /* 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);
+ /* Meh. */
+ if (!subtable) subtable = &OT::Null(OT::CmapSubtable);
+
+ /* UVS subtable. */
+ if (!subtable_uvs) subtable_uvs = cmap->find_subtable (0, 5);
+ /* Meh. */
+ if (!subtable_uvs) subtable_uvs = &OT::Null(OT::CmapSubtable);
+
+ this->table = subtable;
+ this->uvs_table = subtable_uvs;
+ }
+
+ inline void fini (void)
+ {
+ hb_blob_destroy (this->blob);
+ }
+
+ inline bool get_glyph (hb_codepoint_t unicode,
+ hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph) const
+ {
+ if (unlikely (variation_selector))
+ {
+ 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 this->table->get_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;
+ hb_ot_face_glyf_accelerator_t glyf;
+};
+
+
+static hb_ot_font_t *
+_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));
+
+ if (unlikely (!ot_font))
+ return NULL;
+
+ ot_font->cmap.init (face);
+ ot_font->h_metrics.init (face, HB_OT_TAG_hhea, HB_OT_TAG_hmtx);
+ ot_font->v_metrics.init (face, HB_OT_TAG_vhea, HB_OT_TAG_vmtx); /* TODO Can we do this lazily? */
+ ot_font->glyf.init (face);
+
+ return ot_font;
+}
+
+static void
+_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);
+}
+
+
+static hb_bool_t
+hb_ot_get_glyph (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t unicode,
+ hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph,
+ void *user_data HB_UNUSED)
+
+{
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ return ot_font->cmap.get_glyph (unicode, variation_selector, glyph);
+}
+
+static hb_position_t
+hb_ot_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ void *user_data HB_UNUSED)
+{
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ return font->em_scale_x (ot_font->h_metrics.get_advance (glyph));
+}
+
+static hb_position_t
+hb_ot_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ void *user_data HB_UNUSED)
+{
+ const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
+ return font->em_scale_y (-(int) ot_font->v_metrics.get_advance (glyph));
+}
+
+static hb_bool_t
+hb_ot_get_glyph_extents (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ hb_glyph_extents_t *extents,
+ void *user_data HB_UNUSED)
+{
+ 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_font_funcs_t *static_ot_funcs = NULL;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_ot_funcs (void)
+{
+ hb_font_funcs_destroy (static_ot_funcs);
+}
+#endif
+
+static hb_font_funcs_t *
+_hb_ot_get_font_funcs (void)
+{
+retry:
+ hb_font_funcs_t *funcs = (hb_font_funcs_t *) hb_atomic_ptr_get (&static_ot_funcs);
+
+ if (unlikely (!funcs))
+ {
+ funcs = hb_font_funcs_create ();
+
+ hb_font_funcs_set_glyph_func (funcs, hb_ot_get_glyph, NULL, NULL);
+ hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, NULL, NULL);
+ hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, NULL, NULL);
+ //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, NULL, NULL);
+ //hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, NULL, NULL);
+ //hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, NULL, NULL); TODO
+ //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, NULL, NULL);
+ hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, NULL, NULL);
+ //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, NULL, NULL); TODO
+ //hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, NULL, NULL); TODO
+ //hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, NULL, NULL); TODO
+
+ hb_font_funcs_make_immutable (funcs);
+
+ if (!hb_atomic_ptr_cmpexch (&static_ot_funcs, NULL, funcs)) {
+ hb_font_funcs_destroy (funcs);
+ goto retry;
+ }
+
+#ifdef HB_USE_ATEXIT
+ atexit (free_static_ot_funcs); /* First person registers atexit() callback. */
+#endif
+ };
+
+ return funcs;
+}
+
+
+/**
+ * hb_ot_font_set_funcs:
+ *
+ * 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->face);
+ if (unlikely (!ot_font))
+ return;
+
+ hb_font_set_funcs (font,
+ _hb_ot_get_font_funcs (),
+ ot_font,
+ (hb_destroy_func_t) _hb_ot_font_destroy);
+}