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Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-var-avar-table.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-var-avar-table.hh | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-var-avar-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-var-avar-table.hh new file mode 100644 index 0000000000..4b88a40304 --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-var-avar-table.hh @@ -0,0 +1,149 @@ +/* + * Copyright © 2017 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_OT_VAR_AVAR_TABLE_HH +#define HB_OT_VAR_AVAR_TABLE_HH + +#include "hb-open-type-private.hh" + +namespace OT { + + +struct AxisValueMap +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + public: + F2DOT14 fromCoord; /* A normalized coordinate value obtained using + * default normalization. */ + F2DOT14 toCoord; /* The modified, normalized coordinate value. */ + + public: + DEFINE_SIZE_STATIC (4); +}; + +struct SegmentMaps : ArrayOf<AxisValueMap> +{ + inline int map (int value) const + { + /* The following special-cases are not part of OpenType, which requires + * that at least -1, 0, and +1 must be mapped. But we include these as + * part of a better error recovery scheme. */ + + if (len < 2) + { + if (!len) + return value; + else /* len == 1*/ + return value - array[0].fromCoord + array[0].toCoord; + } + + if (value <= array[0].fromCoord) + return value - array[0].fromCoord + array[0].toCoord; + + unsigned int i; + unsigned int count = len; + for (i = 1; i < count && value > array[i].fromCoord; i++) + ; + + if (value >= array[i].fromCoord) + return value - array[i].fromCoord + array[i].toCoord; + + if (unlikely (array[i-1].fromCoord == array[i].fromCoord)) + return array[i-1].toCoord; + + int denom = array[i].fromCoord - array[i-1].fromCoord; + return array[i-1].toCoord + + ((array[i].toCoord - array[i-1].toCoord) * + (value - array[i-1].fromCoord) + denom/2) / denom; + } + + DEFINE_SIZE_ARRAY (2, array); +}; + +/* + * avar — Axis Variations Table + */ + +#define HB_OT_TAG_avar HB_TAG('a','v','a','r') + +struct avar +{ + static const hb_tag_t tableTag = HB_OT_TAG_avar; + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (unlikely (!(version.sanitize (c) && + version.major == 1 && + c->check_struct (this)))) + return_trace (false); + + const SegmentMaps *map = &axisSegmentMapsZ; + unsigned int count = axisCount; + for (unsigned int i = 0; i < count; i++) + { + if (unlikely (!map->sanitize (c))) + return_trace (false); + map = &StructAfter<SegmentMaps> (*map); + } + + return_trace (true); + } + + inline void map_coords (int *coords, unsigned int coords_length) const + { + unsigned int count = MIN<unsigned int> (coords_length, axisCount); + + const SegmentMaps *map = &axisSegmentMapsZ; + for (unsigned int i = 0; i < count; i++) + { + coords[i] = map->map (coords[i]); + map = &StructAfter<SegmentMaps> (*map); + } + } + + protected: + FixedVersion<>version; /* Version of the avar table + * initially set to 0x00010000u */ + UINT16 reserved; /* This field is permanently reserved. Set to 0. */ + UINT16 axisCount; /* The number of variation axes in the font. This + * must be the same number as axisCount in the + * 'fvar' table. */ + SegmentMaps axisSegmentMapsZ; + + public: + DEFINE_SIZE_MIN (8); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_VAR_AVAR_TABLE_HH */ |