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Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-var-fvar-table.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-var-fvar-table.hh | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-var-fvar-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-var-fvar-table.hh new file mode 100644 index 0000000000..2a9357a5e2 --- /dev/null +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-var-fvar-table.hh @@ -0,0 +1,209 @@ +/* + * 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_FVAR_TABLE_HH +#define HB_OT_VAR_FVAR_TABLE_HH + +#include "hb-open-type-private.hh" + +namespace OT { + + +struct InstanceRecord +{ + inline bool sanitize (hb_sanitize_context_t *c, unsigned int axis_count) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + c->check_array (coordinates, coordinates[0].static_size, axis_count)); + } + + protected: + UINT16 subfamilyNameID;/* The name ID for entries in the 'name' table + * that provide subfamily names for this instance. */ + UINT16 reserved; /* Reserved for future use — set to 0. */ + Fixed coordinates[VAR];/* The coordinates array for this instance. */ + //UINT16 postScriptNameIDX;/*Optional. The name ID for entries in the 'name' + // * table that provide PostScript names for this + // * instance. */ + + public: + DEFINE_SIZE_ARRAY (4, coordinates); +}; + +struct AxisRecord +{ + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + public: + Tag axisTag; /* Tag identifying the design variation for the axis. */ + Fixed minValue; /* The minimum coordinate value for the axis. */ + Fixed defaultValue; /* The default coordinate value for the axis. */ + Fixed maxValue; /* The maximum coordinate value for the axis. */ + UINT16 reserved; /* Reserved for future use — set to 0. */ + UINT16 axisNameID; /* The name ID for entries in the 'name' table that + * provide a display name for this axis. */ + + public: + DEFINE_SIZE_STATIC (20); +}; + + +/* + * fvar — Font Variations Table + */ + +#define HB_OT_TAG_fvar HB_TAG('f','v','a','r') + +struct fvar +{ + static const hb_tag_t tableTag = HB_OT_TAG_fvar; + + inline bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (version.sanitize (c) && + likely (version.major == 1) && + c->check_struct (this) && + instanceSize >= axisCount * 4 + 4 && + axisSize <= 1024 && /* Arbitrary, just to simplify overflow checks. */ + instanceSize <= 1024 && /* Arbitrary, just to simplify overflow checks. */ + c->check_range (this, things) && + c->check_range (&StructAtOffset<char> (this, things), + axisCount * axisSize + instanceCount * instanceSize)); + } + + inline unsigned int get_axis_count (void) const + { return axisCount; } + + inline bool get_axis (unsigned int index, hb_ot_var_axis_t *info) const + { + if (unlikely (index >= axisCount)) + return false; + + if (info) + { + const AxisRecord &axis = get_axes ()[index]; + info->tag = axis.axisTag; + info->name_id = axis.axisNameID; + info->default_value = axis.defaultValue / 65536.; + /* Ensure order, to simplify client math. */ + info->min_value = MIN<float> (info->default_value, axis.minValue / 65536.); + info->max_value = MAX<float> (info->default_value, axis.maxValue / 65536.); + } + + return true; + } + + inline unsigned int get_axis_infos (unsigned int start_offset, + unsigned int *axes_count /* IN/OUT */, + hb_ot_var_axis_t *axes_array /* OUT */) const + { + if (axes_count) + { + unsigned int count = axisCount; + start_offset = MIN (start_offset, count); + + count -= start_offset; + axes_array += start_offset; + + count = MIN (count, *axes_count); + *axes_count = count; + + for (unsigned int i = 0; i < count; i++) + get_axis (start_offset + i, axes_array + i); + } + return axisCount; + } + + inline bool find_axis (hb_tag_t tag, unsigned int *index, hb_ot_var_axis_t *info) const + { + const AxisRecord *axes = get_axes (); + unsigned int count = get_axis_count (); + for (unsigned int i = 0; i < count; i++) + if (axes[i].axisTag == tag) + { + if (index) + *index = i; + return get_axis (i, info); + } + if (index) + *index = HB_OT_VAR_NO_AXIS_INDEX; + return false; + } + + inline int normalize_axis_value (unsigned int axis_index, float v) const + { + hb_ot_var_axis_t axis; + if (!get_axis (axis_index, &axis)) + return 0; + + v = MAX (MIN (v, axis.max_value), axis.min_value); /* Clamp. */ + + if (v == axis.default_value) + return 0; + else if (v < axis.default_value) + v = (v - axis.default_value) / (axis.default_value - axis.min_value); + else + v = (v - axis.default_value) / (axis.max_value - axis.default_value); + return (int) (v * 16384. + (v >= 0. ? .5 : -.5)); + } + + protected: + inline const AxisRecord * get_axes (void) const + { return &StructAtOffset<AxisRecord> (this, things); } + + inline const InstanceRecord * get_instances (void) const + { return &StructAtOffset<InstanceRecord> (get_axes () + axisCount, 0); } + + protected: + FixedVersion<>version; /* Version of the fvar table + * initially set to 0x00010000u */ + Offset16 things; /* Offset in bytes from the beginning of the table + * to the start of the AxisRecord array. */ + UINT16 reserved; /* This field is permanently reserved. Set to 2. */ + UINT16 axisCount; /* The number of variation axes in the font (the + * number of records in the axes array). */ + UINT16 axisSize; /* The size in bytes of each VariationAxisRecord — + * set to 20 (0x0014) for this version. */ + UINT16 instanceCount; /* The number of named instances defined in the font + * (the number of records in the instances array). */ + UINT16 instanceSize; /* The size in bytes of each InstanceRecord — set + * to either axisCount * sizeof(Fixed) + 4, or to + * axisCount * sizeof(Fixed) + 6. */ + + public: + DEFINE_SIZE_STATIC (16); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_VAR_FVAR_TABLE_HH */ |