2015-08-23 15:42:20 +02:00
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/*
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* Copyright © 2015 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_GLYF_TABLE_HH
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#define HB_OT_GLYF_TABLE_HH
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#include "hb-open-type-private.hh"
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2017-11-15 04:52:09 +01:00
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#include "hb-ot-head-table.hh"
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2015-08-23 15:42:20 +02:00
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namespace OT {
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/*
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* loca -- Index to Location
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*/
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#define HB_OT_TAG_loca HB_TAG('l','o','c','a')
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struct loca
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{
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2017-11-15 04:54:48 +01:00
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friend struct glyf;
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2015-08-23 15:42:20 +02:00
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static const hb_tag_t tableTag = HB_OT_TAG_loca;
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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2015-09-29 15:57:02 +02:00
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return_trace (true);
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2015-08-23 15:42:20 +02:00
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}
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2017-11-15 04:54:48 +01:00
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protected:
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2018-01-10 03:07:30 +01:00
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HBUINT8 dataX[VAR]; /* Location data. */
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2017-11-15 05:25:29 +01:00
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DEFINE_SIZE_ARRAY (0, dataX);
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2015-08-23 15:42:20 +02:00
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};
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/*
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* glyf -- TrueType Glyph Data
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*/
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#define HB_OT_TAG_glyf HB_TAG('g','l','y','f')
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struct glyf
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{
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static const hb_tag_t tableTag = HB_OT_TAG_glyf;
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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/* We don't check for anything specific here. The users of the
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* struct do all the hard work... */
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2015-09-29 15:57:02 +02:00
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return_trace (true);
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2015-08-23 15:42:20 +02:00
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}
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2017-11-15 04:52:09 +01:00
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struct GlyphHeader
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{
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2018-01-10 03:07:30 +01:00
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HBINT16 numberOfContours; /* If the number of contours is
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2017-11-15 04:52:09 +01:00
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* greater than or equal to zero,
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* this is a simple glyph; if negative,
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* this is a composite glyph. */
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FWORD xMin; /* Minimum x for coordinate data. */
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FWORD yMin; /* Minimum y for coordinate data. */
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FWORD xMax; /* Maximum x for coordinate data. */
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FWORD yMax; /* Maximum y for coordinate data. */
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DEFINE_SIZE_STATIC (10);
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};
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struct accelerator_t
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{
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inline void init (hb_face_t *face)
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{
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2018-01-09 15:48:51 +01:00
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hb_blob_t *head_blob = Sanitizer<head>().sanitize (face->reference_table (HB_OT_TAG_head));
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2017-11-15 04:52:09 +01:00
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const head *head_table = Sanitizer<head>::lock_instance (head_blob);
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if ((unsigned int) head_table->indexToLocFormat > 1 || head_table->glyphDataFormat != 0)
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{
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/* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */
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hb_blob_destroy (head_blob);
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return;
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}
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short_offset = 0 == head_table->indexToLocFormat;
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hb_blob_destroy (head_blob);
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2018-01-09 15:48:51 +01:00
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loca_blob = Sanitizer<loca>().sanitize (face->reference_table (HB_OT_TAG_loca));
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2017-11-15 04:52:09 +01:00
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loca_table = Sanitizer<loca>::lock_instance (loca_blob);
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2018-01-09 15:48:51 +01:00
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glyf_blob = Sanitizer<glyf>().sanitize (face->reference_table (HB_OT_TAG_glyf));
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2017-11-15 04:52:09 +01:00
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glyf_table = Sanitizer<glyf>::lock_instance (glyf_blob);
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num_glyphs = MAX (1u, hb_blob_get_length (loca_blob) / (short_offset ? 2 : 4)) - 1;
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glyf_len = hb_blob_get_length (glyf_blob);
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}
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inline void fini (void)
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{
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hb_blob_destroy (loca_blob);
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hb_blob_destroy (glyf_blob);
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}
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inline bool get_extents (hb_codepoint_t glyph,
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hb_glyph_extents_t *extents) const
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{
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if (unlikely (glyph >= num_glyphs))
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return false;
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unsigned int start_offset, end_offset;
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if (short_offset)
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{
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2018-01-10 03:07:30 +01:00
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const HBUINT16 *offsets = (const HBUINT16 *) loca_table->dataX;
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2017-11-15 05:25:29 +01:00
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start_offset = 2 * offsets[glyph];
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end_offset = 2 * offsets[glyph + 1];
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2017-11-15 04:52:09 +01:00
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}
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else
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{
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2018-01-10 03:07:30 +01:00
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const HBUINT32 *offsets = (const HBUINT32 *) loca_table->dataX;
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2017-11-15 05:25:29 +01:00
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start_offset = offsets[glyph];
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end_offset = offsets[glyph + 1];
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2017-11-15 04:52:09 +01:00
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}
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if (start_offset > end_offset || end_offset > glyf_len)
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return false;
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if (end_offset - start_offset < GlyphHeader::static_size)
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return true; /* Empty glyph; zero extents. */
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const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyf_table, start_offset);
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extents->x_bearing = MIN (glyph_header.xMin, glyph_header.xMax);
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extents->y_bearing = MAX (glyph_header.yMin, glyph_header.yMax);
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extents->width = MAX (glyph_header.xMin, glyph_header.xMax) - extents->x_bearing;
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extents->height = MIN (glyph_header.yMin, glyph_header.yMax) - extents->y_bearing;
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return true;
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}
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private:
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bool short_offset;
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unsigned int num_glyphs;
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const loca *loca_table;
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const glyf *glyf_table;
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hb_blob_t *loca_blob;
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hb_blob_t *glyf_blob;
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unsigned int glyf_len;
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};
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2017-11-15 04:54:48 +01:00
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protected:
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2018-01-10 03:07:30 +01:00
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HBUINT8 dataX[VAR]; /* Glyphs data. */
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2015-08-23 15:42:20 +02:00
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DEFINE_SIZE_ARRAY (0, dataX);
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};
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} /* namespace OT */
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#endif /* HB_OT_GLYF_TABLE_HH */
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