| /* |
| * 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.hh" |
| #include "hb-ot-var-common.hh" |
| |
| |
| /* |
| * avar -- Axis Variations |
| * https://docs.microsoft.com/en-us/typography/opentype/spec/avar |
| */ |
| |
| #define HB_OT_TAG_avar HB_TAG('a','v','a','r') |
| |
| |
| namespace OT { |
| |
| |
| /* "Spec": https://github.com/be-fonts/boring-expansion-spec/issues/14 */ |
| struct avarV2Tail |
| { |
| friend struct avar; |
| |
| bool sanitize (hb_sanitize_context_t *c, |
| const void *base) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (varIdxMap.sanitize (c, base) && |
| varStore.sanitize (c, base)); |
| } |
| |
| protected: |
| Offset32To<DeltaSetIndexMap> varIdxMap; /* Offset from the beginning of 'avar' table. */ |
| Offset32To<VariationStore> varStore; /* Offset from the beginning of 'avar' table. */ |
| |
| public: |
| DEFINE_SIZE_STATIC (8); |
| }; |
| |
| |
| struct AxisValueMap |
| { |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this)); |
| } |
| |
| public: |
| F2DOT14 coords[2]; |
| // F2DOT14 fromCoord; /* A normalized coordinate value obtained using |
| // * default normalization. */ |
| // F2DOT14 toCoord; /* The modified, normalized coordinate value. */ |
| |
| public: |
| DEFINE_SIZE_STATIC (4); |
| }; |
| |
| struct SegmentMaps : Array16Of<AxisValueMap> |
| { |
| int map (int value, unsigned int from_offset = 0, unsigned int to_offset = 1) const |
| { |
| #define fromCoord coords[from_offset] |
| #define toCoord coords[to_offset] |
| /* 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 - arrayZ[0].fromCoord + arrayZ[0].toCoord; |
| } |
| |
| if (value <= arrayZ[0].fromCoord) |
| return value - arrayZ[0].fromCoord + arrayZ[0].toCoord; |
| |
| unsigned int i; |
| unsigned int count = len - 1; |
| for (i = 1; i < count && value > arrayZ[i].fromCoord; i++) |
| ; |
| |
| if (value >= arrayZ[i].fromCoord) |
| return value - arrayZ[i].fromCoord + arrayZ[i].toCoord; |
| |
| if (unlikely (arrayZ[i-1].fromCoord == arrayZ[i].fromCoord)) |
| return arrayZ[i-1].toCoord; |
| |
| int denom = arrayZ[i].fromCoord - arrayZ[i-1].fromCoord; |
| return roundf (arrayZ[i-1].toCoord + ((float) (arrayZ[i].toCoord - arrayZ[i-1].toCoord) * |
| (value - arrayZ[i-1].fromCoord)) / denom); |
| #undef toCoord |
| #undef fromCoord |
| } |
| |
| int unmap (int value) const { return map (value, 1, 0); } |
| |
| public: |
| DEFINE_SIZE_ARRAY (2, *this); |
| }; |
| |
| struct avar |
| { |
| static constexpr hb_tag_t tableTag = HB_OT_TAG_avar; |
| |
| bool has_data () const { return version.to_int (); } |
| |
| const SegmentMaps* get_segment_maps () const |
| { return &firstAxisSegmentMaps; } |
| |
| unsigned get_axis_count () const |
| { return axisCount; } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| if (!(version.sanitize (c) && |
| (version.major == 1 |
| #ifndef HB_NO_VARIATIONS2 |
| || version.major == 2 |
| #endif |
| ) && |
| c->check_struct (this))) |
| return_trace (false); |
| |
| const SegmentMaps *map = &firstAxisSegmentMaps; |
| unsigned int count = axisCount; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| if (unlikely (!map->sanitize (c))) |
| return_trace (false); |
| map = &StructAfter<SegmentMaps> (*map); |
| } |
| |
| #ifndef HB_NO_VARIATIONS2 |
| if (version.major < 2) |
| return_trace (true); |
| |
| const auto &v2 = * (const avarV2Tail *) map; |
| if (unlikely (!v2.sanitize (c, this))) |
| return_trace (false); |
| #endif |
| |
| return_trace (true); |
| } |
| |
| void map_coords (int *coords, unsigned int coords_length) const |
| { |
| unsigned int count = hb_min (coords_length, axisCount); |
| |
| const SegmentMaps *map = &firstAxisSegmentMaps; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| coords[i] = map->map (coords[i]); |
| map = &StructAfter<SegmentMaps> (*map); |
| } |
| |
| #ifndef HB_NO_VARIATIONS2 |
| if (version.major < 2) |
| return; |
| |
| for (; count < axisCount; count++) |
| map = &StructAfter<SegmentMaps> (*map); |
| |
| const auto &v2 = * (const avarV2Tail *) map; |
| |
| const auto &varidx_map = this+v2.varIdxMap; |
| const auto &var_store = this+v2.varStore; |
| auto *var_store_cache = var_store.create_cache (); |
| |
| hb_vector_t<int> out; |
| out.alloc (coords_length); |
| for (unsigned i = 0; i < coords_length; i++) |
| { |
| int v = coords[i]; |
| uint32_t varidx = varidx_map.map (i); |
| float delta = var_store.get_delta (varidx, coords, coords_length, var_store_cache); |
| v += roundf (delta); |
| v = hb_clamp (v, -(1<<14), +(1<<14)); |
| out.push (v); |
| } |
| |
| OT::VariationStore::destroy_cache (var_store_cache); |
| |
| for (unsigned i = 0; i < coords_length; i++) |
| coords[i] = out[i]; |
| #endif |
| } |
| |
| void unmap_coords (int *coords, unsigned int coords_length) const |
| { |
| unsigned int count = hb_min (coords_length, axisCount); |
| |
| const SegmentMaps *map = &firstAxisSegmentMaps; |
| for (unsigned int i = 0; i < count; i++) |
| { |
| coords[i] = map->unmap (coords[i]); |
| map = &StructAfter<SegmentMaps> (*map); |
| } |
| } |
| |
| protected: |
| FixedVersion<>version; /* Version of the avar table |
| * initially set to 0x00010000u */ |
| HBUINT16 reserved; /* This field is permanently reserved. Set to 0. */ |
| HBUINT16 axisCount; /* The number of variation axes in the font. This |
| * must be the same number as axisCount in the |
| * 'fvar' table. */ |
| SegmentMaps firstAxisSegmentMaps; |
| |
| public: |
| DEFINE_SIZE_MIN (8); |
| }; |
| |
| } /* namespace OT */ |
| |
| |
| #endif /* HB_OT_VAR_AVAR_TABLE_HH */ |