HarfBuzz text shaping engine
http://harfbuzz.github.io/
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151 lines
4.1 KiB
151 lines
4.1 KiB
/* |
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* Copyright © 2017 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_VAR_AVAR_TABLE_HH |
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#define HB_OT_VAR_AVAR_TABLE_HH |
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#include "hb-open-type-private.hh" |
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/* |
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* avar -- Axis Variations |
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* https://docs.microsoft.com/en-us/typography/opentype/spec/avar |
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*/ |
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#define HB_OT_TAG_avar HB_TAG('a','v','a','r') |
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namespace OT { |
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struct AxisValueMap |
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{ |
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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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return_trace (c->check_struct (this)); |
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} |
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public: |
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F2DOT14 fromCoord; /* A normalized coordinate value obtained using |
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* default normalization. */ |
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F2DOT14 toCoord; /* The modified, normalized coordinate value. */ |
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public: |
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DEFINE_SIZE_STATIC (4); |
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}; |
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struct SegmentMaps : ArrayOf<AxisValueMap> |
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{ |
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inline int map (int value) const |
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{ |
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/* The following special-cases are not part of OpenType, which requires |
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* that at least -1, 0, and +1 must be mapped. But we include these as |
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* part of a better error recovery scheme. */ |
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if (len < 2) |
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{ |
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if (!len) |
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return value; |
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else /* len == 1*/ |
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return value - arrayZ[0].fromCoord + arrayZ[0].toCoord; |
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} |
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if (value <= arrayZ[0].fromCoord) |
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return value - arrayZ[0].fromCoord + arrayZ[0].toCoord; |
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unsigned int i; |
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unsigned int count = len; |
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for (i = 1; i < count && value > arrayZ[i].fromCoord; i++) |
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; |
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if (value >= arrayZ[i].fromCoord) |
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return value - arrayZ[i].fromCoord + arrayZ[i].toCoord; |
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if (unlikely (arrayZ[i-1].fromCoord == arrayZ[i].fromCoord)) |
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return arrayZ[i-1].toCoord; |
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int denom = arrayZ[i].fromCoord - arrayZ[i-1].fromCoord; |
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return arrayZ[i-1].toCoord + |
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((arrayZ[i].toCoord - arrayZ[i-1].toCoord) * |
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(value - arrayZ[i-1].fromCoord) + denom/2) / denom; |
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} |
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DEFINE_SIZE_ARRAY (2, arrayZ); |
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}; |
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struct avar |
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{ |
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static const hb_tag_t tableTag = HB_OT_TAG_avar; |
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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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if (unlikely (!(version.sanitize (c) && |
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version.major == 1 && |
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c->check_struct (this)))) |
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return_trace (false); |
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const SegmentMaps *map = axisSegmentMapsZ; |
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unsigned int count = axisCount; |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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if (unlikely (!map->sanitize (c))) |
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return_trace (false); |
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map = &StructAfter<SegmentMaps> (*map); |
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} |
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return_trace (true); |
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} |
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inline void map_coords (int *coords, unsigned int coords_length) const |
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{ |
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unsigned int count = MIN<unsigned int> (coords_length, axisCount); |
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const SegmentMaps *map = axisSegmentMapsZ; |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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coords[i] = map->map (coords[i]); |
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map = &StructAfter<SegmentMaps> (*map); |
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} |
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} |
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protected: |
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FixedVersion<>version; /* Version of the avar table |
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* initially set to 0x00010000u */ |
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HBUINT16 reserved; /* This field is permanently reserved. Set to 0. */ |
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HBUINT16 axisCount; /* The number of variation axes in the font. This |
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* must be the same number as axisCount in the |
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* 'fvar' table. */ |
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SegmentMaps axisSegmentMapsZ[VAR]; |
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public: |
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DEFINE_SIZE_MIN (8); |
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}; |
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} /* namespace OT */ |
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#endif /* HB_OT_VAR_AVAR_TABLE_HH */
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