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Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-aat-layout-trak-table.hh')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-src/src/hb-aat-layout-trak-table.hh | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-aat-layout-trak-table.hh b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-aat-layout-trak-table.hh deleted file mode 100644 index baa1c72020f..00000000000 --- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-aat-layout-trak-table.hh +++ /dev/null @@ -1,230 +0,0 @@ -/* - * Copyright © 2018 Ebrahim Byagowi - * Copyright © 2018 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 - */ - -#ifndef HB_AAT_LAYOUT_TRAK_TABLE_HH -#define HB_AAT_LAYOUT_TRAK_TABLE_HH - -#include "hb-aat-layout-common.hh" -#include "hb-ot-layout.hh" -#include "hb-open-type.hh" - -/* - * trak -- Tracking - * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6trak.html - */ -#define HB_AAT_TAG_trak HB_TAG('t','r','a','k') - - -namespace AAT { - - -struct TrackTableEntry -{ - friend struct TrackData; - - float get_track_value () const { return track.to_float (); } - - int get_value (const void *base, unsigned int index, - unsigned int table_size) const - { return (base+valuesZ).as_array (table_size)[index]; } - - public: - bool sanitize (hb_sanitize_context_t *c, const void *base, - unsigned int table_size) const - { - TRACE_SANITIZE (this); - return_trace (likely (c->check_struct (this) && - (valuesZ.sanitize (c, base, table_size)))); - } - - protected: - HBFixed track; /* Track value for this record. */ - NameID trackNameID; /* The 'name' table index for this track. - * (a short word or phrase like "loose" - * or "very tight") */ - NNOffsetTo<UnsizedArrayOf<FWORD>> - valuesZ; /* Offset from start of tracking table to - * per-size tracking values for this track. */ - - public: - DEFINE_SIZE_STATIC (8); -}; - -struct TrackData -{ - float interpolate_at (unsigned int idx, - float target_size, - const TrackTableEntry &trackTableEntry, - const void *base) const - { - unsigned int sizes = nSizes; - hb_array_t<const HBFixed> size_table ((base+sizeTable).arrayZ, sizes); - - float s0 = size_table[idx].to_float (); - float s1 = size_table[idx + 1].to_float (); - float t = unlikely (s0 == s1) ? 0.f : (target_size - s0) / (s1 - s0); - return t * trackTableEntry.get_value (base, idx + 1, sizes) + - (1.f - t) * trackTableEntry.get_value (base, idx, sizes); - } - - int get_tracking (const void *base, float ptem) const - { - /* - * Choose track. - */ - const TrackTableEntry *trackTableEntry = nullptr; - unsigned int count = nTracks; - for (unsigned int i = 0; i < count; i++) - { - /* Note: Seems like the track entries are sorted by values. But the - * spec doesn't explicitly say that. It just mentions it in the example. */ - - /* For now we only seek for track entries with zero tracking value */ - - if (trackTable[i].get_track_value () == 0.f) - { - trackTableEntry = &trackTable[i]; - break; - } - } - if (!trackTableEntry) return 0.; - - /* - * Choose size. - */ - unsigned int sizes = nSizes; - if (!sizes) return 0.; - if (sizes == 1) return trackTableEntry->get_value (base, 0, sizes); - - hb_array_t<const HBFixed> size_table ((base+sizeTable).arrayZ, sizes); - unsigned int size_index; - for (size_index = 0; size_index < sizes - 1; size_index++) - if (size_table[size_index].to_float () >= ptem) - break; - - return roundf (interpolate_at (size_index ? size_index - 1 : 0, ptem, - *trackTableEntry, base)); - } - - bool sanitize (hb_sanitize_context_t *c, const void *base) const - { - TRACE_SANITIZE (this); - return_trace (likely (c->check_struct (this) && - sizeTable.sanitize (c, base, nSizes) && - trackTable.sanitize (c, nTracks, base, nSizes))); - } - - protected: - HBUINT16 nTracks; /* Number of separate tracks included in this table. */ - HBUINT16 nSizes; /* Number of point sizes included in this table. */ - LNNOffsetTo<UnsizedArrayOf<HBFixed>> - sizeTable; /* Offset from start of the tracking table to - * Array[nSizes] of size values.. */ - UnsizedArrayOf<TrackTableEntry> - trackTable; /* Array[nTracks] of TrackTableEntry records. */ - - public: - DEFINE_SIZE_ARRAY (8, trackTable); -}; - -struct trak -{ - static constexpr hb_tag_t tableTag = HB_AAT_TAG_trak; - - bool has_data () const { return version.to_int (); } - - bool apply (hb_aat_apply_context_t *c) const - { - TRACE_APPLY (this); - - hb_mask_t trak_mask = c->plan->trak_mask; - - const float ptem = c->font->ptem; - if (unlikely (ptem <= 0.f)) - return_trace (false); - - hb_buffer_t *buffer = c->buffer; - if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction)) - { - const TrackData &trackData = this+horizData; - int tracking = trackData.get_tracking (this, ptem); - hb_position_t offset_to_add = c->font->em_scalef_x (tracking / 2); - hb_position_t advance_to_add = c->font->em_scalef_x (tracking); - foreach_grapheme (buffer, start, end) - { - if (!(buffer->info[start].mask & trak_mask)) continue; - buffer->pos[start].x_advance += advance_to_add; - buffer->pos[start].x_offset += offset_to_add; - } - } - else - { - const TrackData &trackData = this+vertData; - int tracking = trackData.get_tracking (this, ptem); - hb_position_t offset_to_add = c->font->em_scalef_y (tracking / 2); - hb_position_t advance_to_add = c->font->em_scalef_y (tracking); - foreach_grapheme (buffer, start, end) - { - if (!(buffer->info[start].mask & trak_mask)) continue; - buffer->pos[start].y_advance += advance_to_add; - buffer->pos[start].y_offset += offset_to_add; - } - } - - return_trace (true); - } - - bool sanitize (hb_sanitize_context_t *c) const - { - TRACE_SANITIZE (this); - - return_trace (likely (c->check_struct (this) && - version.major == 1 && - horizData.sanitize (c, this, this) && - vertData.sanitize (c, this, this))); - } - - protected: - FixedVersion<>version; /* Version of the tracking table - * (0x00010000u for version 1.0). */ - HBUINT16 format; /* Format of the tracking table (set to 0). */ - OffsetTo<TrackData> - horizData; /* Offset from start of tracking table to TrackData - * for horizontal text (or 0 if none). */ - OffsetTo<TrackData> - vertData; /* Offset from start of tracking table to TrackData - * for vertical text (or 0 if none). */ - HBUINT16 reserved; /* Reserved. Set to 0. */ - - public: - DEFINE_SIZE_STATIC (12); -}; - -} /* namespace AAT */ - - -#endif /* HB_AAT_LAYOUT_TRAK_TABLE_HH */ |