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-rw-r--r--src/hb-ot-font.cc348
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diff --git a/src/hb-ot-font.cc b/src/hb-ot-font.cc
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+/*
+ * 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-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,
+ unsigned int 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));
+ 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));
+ if (unlikely (!this->num_advances ||
+ 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);
+ 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 one EM. 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_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);
+ /* 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;
+};
+
+
+static hb_ot_font_t *
+_hb_ot_font_create (hb_font_t *font)
+{
+ 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;
+
+ unsigned int upem = face->get_upem ();
+
+ 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? */
+
+ 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 ();
+
+ 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 (-ot_font->v_metrics.get_advance (glyph));
+}
+
+static hb_bool_t
+hb_ot_get_glyph_h_origin (hb_font_t *font HB_UNUSED,
+ void *font_data HB_UNUSED,
+ hb_codepoint_t glyph HB_UNUSED,
+ hb_position_t *x HB_UNUSED,
+ hb_position_t *y HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ /* We always work in the horizontal coordinates. */
+ return true;
+}
+
+static hb_bool_t
+hb_ot_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ hb_position_t *x,
+ hb_position_t *y,
+ void *user_data HB_UNUSED)
+{
+ /* TODO */
+ return false;
+}
+
+static hb_position_t
+hb_ot_get_glyph_h_kerning (hb_font_t *font,
+ void *font_data,
+ hb_codepoint_t left_glyph,
+ hb_codepoint_t right_glyph,
+ void *user_data HB_UNUSED)
+{
+ /* TODO */
+ return 0;
+}
+
+static hb_position_t
+hb_ot_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
+ void *font_data HB_UNUSED,
+ hb_codepoint_t top_glyph HB_UNUSED,
+ hb_codepoint_t bottom_glyph HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ /* OpenType doesn't have vertical-kerning other than GPOS. */
+ return 0;
+}
+
+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)
+{
+ /* TODO */
+ return false;
+}
+
+static hb_bool_t
+hb_ot_get_glyph_contour_point (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ unsigned int point_index,
+ hb_position_t *x,
+ hb_position_t *y,
+ void *user_data HB_UNUSED)
+{
+ /* TODO */
+ return false;
+}
+
+static hb_bool_t
+hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ char *name, unsigned int size,
+ void *user_data HB_UNUSED)
+{
+ /* TODO */
+ return false;
+}
+
+static hb_bool_t
+hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ const char *name, int len, /* -1 means nul-terminated */
+ hb_codepoint_t *glyph,
+ void *user_data HB_UNUSED)
+{
+ /* TODO */
+ return false;
+}
+
+
+static hb_font_funcs_t *
+_hb_ot_get_font_funcs (void)
+{
+ static const hb_font_funcs_t ot_ffuncs = {
+ HB_OBJECT_HEADER_STATIC,
+
+ true, /* immutable */
+
+ {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_ot_get_##name,
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ }
+ };
+
+ return const_cast<hb_font_funcs_t *> (&ot_ffuncs);
+}
+
+
+void
+hb_ot_font_set_funcs (hb_font_t *font)
+{
+ hb_ot_font_t *ot_font = _hb_ot_font_create (font);
+ 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);
+}
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