211 lines
6.6 KiB
C++
211 lines
6.6 KiB
C++
/*
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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_FVAR_TABLE_HH
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#define HB_OT_VAR_FVAR_TABLE_HH
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#include "hb-open-type-private.hh"
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/*
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* fvar -- Font Variations
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* https://docs.microsoft.com/en-us/typography/opentype/spec/fvar
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*/
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#define HB_OT_TAG_fvar HB_TAG('f','v','a','r')
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namespace OT {
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struct InstanceRecord
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{
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inline bool sanitize (hb_sanitize_context_t *c, unsigned int axis_count) 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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c->check_array (coordinates, coordinates[0].static_size, axis_count));
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}
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protected:
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NameID subfamilyNameID;/* The name ID for entries in the 'name' table
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* that provide subfamily names for this instance. */
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HBUINT16 reserved; /* Reserved for future use — set to 0. */
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Fixed coordinates[VAR];/* The coordinates array for this instance. */
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//NameID postScriptNameIDX;/*Optional. The name ID for entries in the 'name'
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// * table that provide PostScript names for this
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// * instance. */
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public:
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DEFINE_SIZE_ARRAY (4, coordinates);
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};
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struct AxisRecord
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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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Tag axisTag; /* Tag identifying the design variation for the axis. */
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Fixed minValue; /* The minimum coordinate value for the axis. */
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Fixed defaultValue; /* The default coordinate value for the axis. */
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Fixed maxValue; /* The maximum coordinate value for the axis. */
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HBUINT16 reserved; /* Reserved for future use — set to 0. */
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NameID axisNameID; /* The name ID for entries in the 'name' table that
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* provide a display name for this axis. */
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public:
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DEFINE_SIZE_STATIC (20);
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};
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struct fvar
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{
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static const hb_tag_t tableTag = HB_OT_TAG_fvar;
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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 (version.sanitize (c) &&
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likely (version.major == 1) &&
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c->check_struct (this) &&
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instanceSize >= axisCount * 4 + 4 &&
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axisSize <= 1024 && /* Arbitrary, just to simplify overflow checks. */
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instanceSize <= 1024 && /* Arbitrary, just to simplify overflow checks. */
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c->check_range (this, things) &&
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c->check_range (&StructAtOffset<char> (this, things),
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axisCount * axisSize + instanceCount * instanceSize));
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}
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inline unsigned int get_axis_count (void) const
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{ return axisCount; }
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inline bool get_axis (unsigned int index, hb_ot_var_axis_t *info) const
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{
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if (unlikely (index >= axisCount))
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return false;
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if (info)
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{
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const AxisRecord &axis = get_axes ()[index];
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info->tag = axis.axisTag;
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info->name_id = axis.axisNameID;
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info->default_value = axis.defaultValue / 65536.;
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/* Ensure order, to simplify client math. */
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info->min_value = MIN<float> (info->default_value, axis.minValue / 65536.);
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info->max_value = MAX<float> (info->default_value, axis.maxValue / 65536.);
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}
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return true;
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}
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inline unsigned int get_axis_infos (unsigned int start_offset,
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unsigned int *axes_count /* IN/OUT */,
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hb_ot_var_axis_t *axes_array /* OUT */) const
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{
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if (axes_count)
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{
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unsigned int count = axisCount;
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start_offset = MIN (start_offset, count);
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count -= start_offset;
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axes_array += start_offset;
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count = MIN (count, *axes_count);
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*axes_count = count;
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for (unsigned int i = 0; i < count; i++)
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get_axis (start_offset + i, axes_array + i);
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}
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return axisCount;
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}
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inline bool find_axis (hb_tag_t tag, unsigned int *index, hb_ot_var_axis_t *info) const
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{
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const AxisRecord *axes = get_axes ();
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unsigned int count = get_axis_count ();
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for (unsigned int i = 0; i < count; i++)
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if (axes[i].axisTag == tag)
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{
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if (index)
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*index = i;
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return get_axis (i, info);
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}
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if (index)
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*index = HB_OT_VAR_NO_AXIS_INDEX;
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return false;
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}
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inline int normalize_axis_value (unsigned int axis_index, float v) const
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{
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hb_ot_var_axis_t axis;
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if (!get_axis (axis_index, &axis))
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return 0;
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v = MAX (MIN (v, axis.max_value), axis.min_value); /* Clamp. */
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if (v == axis.default_value)
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return 0;
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else if (v < axis.default_value)
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v = (v - axis.default_value) / (axis.default_value - axis.min_value);
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else
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v = (v - axis.default_value) / (axis.max_value - axis.default_value);
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return (int) (v * 16384. + (v >= 0. ? .5 : -.5));
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}
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protected:
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inline const AxisRecord * get_axes (void) const
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{ return &StructAtOffset<AxisRecord> (this, things); }
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inline const InstanceRecord * get_instances (void) const
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{ return &StructAtOffset<InstanceRecord> (get_axes () + axisCount, 0); }
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protected:
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FixedVersion<>version; /* Version of the fvar table
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* initially set to 0x00010000u */
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Offset16 things; /* Offset in bytes from the beginning of the table
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* to the start of the AxisRecord array. */
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HBUINT16 reserved; /* This field is permanently reserved. Set to 2. */
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HBUINT16 axisCount; /* The number of variation axes in the font (the
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* number of records in the axes array). */
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HBUINT16 axisSize; /* The size in bytes of each VariationAxisRecord —
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* set to 20 (0x0014) for this version. */
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HBUINT16 instanceCount; /* The number of named instances defined in the font
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* (the number of records in the instances array). */
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HBUINT16 instanceSize; /* The size in bytes of each InstanceRecord — set
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* to either axisCount * sizeof(Fixed) + 4, or to
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* axisCount * sizeof(Fixed) + 6. */
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public:
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DEFINE_SIZE_STATIC (16);
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};
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} /* namespace OT */
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#endif /* HB_OT_VAR_FVAR_TABLE_HH */
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