440 lines
14 KiB
C++
440 lines
14 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.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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friend struct fvar;
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hb_array_t<const HBFixed> get_coordinates (unsigned int axis_count) const
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{ return coordinatesZ.as_array (axis_count); }
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bool subset (hb_subset_context_t *c,
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unsigned axis_count,
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bool has_postscript_nameid) const
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{
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TRACE_SUBSET (this);
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if (unlikely (!c->serializer->embed (subfamilyNameID))) return_trace (false);
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if (unlikely (!c->serializer->embed (flags))) return_trace (false);
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const hb_array_t<const HBFixed> coords = get_coordinates (axis_count);
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const hb_hashmap_t<hb_tag_t, float> *axes_location = c->plan->user_axes_location;
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for (unsigned i = 0 ; i < axis_count; i++)
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{
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unsigned *axis_tag;
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// only keep instances whose coordinates == pinned axis location
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if (!c->plan->axes_old_index_tag_map->has (i, &axis_tag)) continue;
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if (axes_location->has (*axis_tag) &&
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fabsf (axes_location->get (*axis_tag) - coords[i].to_float ()) > 0.001f)
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return_trace (false);
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if (!c->plan->axes_index_map->has (i))
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continue;
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if (!c->serializer->embed (coords[i]))
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return_trace (false);
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}
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if (has_postscript_nameid)
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{
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NameID name_id;
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name_id = StructAfter<NameID> (coords);
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if (!c->serializer->embed (name_id))
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return_trace (false);
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}
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return_trace (true);
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}
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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 (coordinatesZ.arrayZ, 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 flags; /* Reserved for future use — set to 0. */
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UnsizedArrayOf<HBFixed>
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coordinatesZ; /* 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_UNBOUNDED (4);
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};
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struct AxisRecord
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{
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int cmp (hb_tag_t key) const { return axisTag.cmp (key); }
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enum
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{
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AXIS_FLAG_HIDDEN = 0x0001,
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};
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#ifndef HB_DISABLE_DEPRECATED
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void get_axis_deprecated (hb_ot_var_axis_t *info) const
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{
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info->tag = axisTag;
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info->name_id = axisNameID;
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get_coordinates (info->min_value, info->default_value, info->max_value);
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}
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#endif
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void get_axis_info (unsigned axis_index, hb_ot_var_axis_info_t *info) const
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{
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info->axis_index = axis_index;
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info->tag = axisTag;
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info->name_id = axisNameID;
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info->flags = (hb_ot_var_axis_flags_t) (unsigned int) flags;
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get_coordinates (info->min_value, info->default_value, info->max_value);
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info->reserved = 0;
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}
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hb_tag_t get_axis_tag () const { return axisTag; }
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int normalize_axis_value (float v) const
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{
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float min_value, default_value, max_value;
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get_coordinates (min_value, default_value, max_value);
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v = hb_clamp (v, min_value, max_value);
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if (v == default_value)
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return 0;
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else if (v < default_value)
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v = (v - default_value) / (default_value - min_value);
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else
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v = (v - default_value) / (max_value - default_value);
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return roundf (v * 16384.f);
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}
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float unnormalize_axis_value (int v) const
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{
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float min_value, default_value, max_value;
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get_coordinates (min_value, default_value, max_value);
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if (v == 0)
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return default_value;
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else if (v < 0)
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return v * (default_value - min_value) / 16384.f + default_value;
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else
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return v * (max_value - default_value) / 16384.f + default_value;
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}
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hb_ot_name_id_t get_name_id () const { return axisNameID; }
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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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void get_coordinates (float &min, float &default_, float &max) const
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{
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default_ = defaultValue / 65536.f;
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/* Ensure order, to simplify client math. */
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min = hb_min (default_, minValue / 65536.f);
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max = hb_max (default_, maxValue / 65536.f);
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}
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float get_default () const
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{
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return defaultValue / 65536.f;
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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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protected:
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HBFixed minValue; /* The minimum coordinate value for the axis. */
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HBFixed defaultValue; /* The default coordinate value for the axis. */
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HBFixed maxValue; /* The maximum coordinate value for the axis. */
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public:
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HBUINT16 flags; /* Axis flags. */
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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 constexpr hb_tag_t tableTag = HB_OT_TAG_fvar;
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bool has_data () const { return version.to_int (); }
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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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axisSize == 20 && /* Assumed in our code. */
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instanceSize >= axisCount * 4 + 4 &&
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get_axes ().sanitize (c) &&
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c->check_range (get_instance (0), instanceCount, instanceSize));
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}
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unsigned int get_axis_count () const { return axisCount; }
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#ifndef HB_DISABLE_DEPRECATED
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unsigned int get_axes_deprecated (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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hb_array_t<const AxisRecord> arr = get_axes ().sub_array (start_offset, axes_count);
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for (unsigned i = 0; i < arr.length; ++i)
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arr[i].get_axis_deprecated (&axes_array[i]);
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}
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return axisCount;
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}
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#endif
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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_info_t *axes_array /* OUT */) const
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{
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if (axes_count)
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{
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hb_array_t<const AxisRecord> arr = get_axes ().sub_array (start_offset, axes_count);
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for (unsigned i = 0; i < arr.length; ++i)
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arr[i].get_axis_info (start_offset + i, &axes_array[i]);
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}
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return axisCount;
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}
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#ifndef HB_DISABLE_DEPRECATED
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bool
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find_axis_deprecated (hb_tag_t tag, unsigned *axis_index, hb_ot_var_axis_t *info) const
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{
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unsigned i;
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if (!axis_index) axis_index = &i;
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*axis_index = HB_OT_VAR_NO_AXIS_INDEX;
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auto axes = get_axes ();
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return axes.lfind (tag, axis_index) && ((void) axes[*axis_index].get_axis_deprecated (info), true);
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}
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#endif
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bool
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find_axis_info (hb_tag_t tag, hb_ot_var_axis_info_t *info) const
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{
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unsigned i;
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auto axes = get_axes ();
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return axes.lfind (tag, &i) && ((void) axes[i].get_axis_info (i, info), true);
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}
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int normalize_axis_value (unsigned int axis_index, float v) const
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{ return get_axes ()[axis_index].normalize_axis_value (v); }
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float unnormalize_axis_value (unsigned int axis_index, int v) const
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{ return get_axes ()[axis_index].unnormalize_axis_value (v); }
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unsigned int get_instance_count () const { return instanceCount; }
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hb_ot_name_id_t get_instance_subfamily_name_id (unsigned int instance_index) const
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{
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const InstanceRecord *instance = get_instance (instance_index);
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if (unlikely (!instance)) return HB_OT_NAME_ID_INVALID;
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return instance->subfamilyNameID;
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}
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hb_ot_name_id_t get_instance_postscript_name_id (unsigned int instance_index) const
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{
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const InstanceRecord *instance = get_instance (instance_index);
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if (unlikely (!instance)) return HB_OT_NAME_ID_INVALID;
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if (instanceSize >= axisCount * 4 + 6)
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return StructAfter<NameID> (instance->get_coordinates (axisCount));
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return HB_OT_NAME_ID_INVALID;
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}
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unsigned int get_instance_coords (unsigned int instance_index,
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unsigned int *coords_length, /* IN/OUT */
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float *coords /* OUT */) const
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{
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const InstanceRecord *instance = get_instance (instance_index);
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if (unlikely (!instance))
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{
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if (coords_length)
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*coords_length = 0;
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return 0;
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}
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if (coords_length && *coords_length)
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{
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hb_array_t<const HBFixed> instanceCoords = instance->get_coordinates (axisCount)
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.sub_array (0, coords_length);
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for (unsigned int i = 0; i < instanceCoords.length; i++)
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coords[i] = instanceCoords.arrayZ[i].to_float ();
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}
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return axisCount;
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}
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void collect_name_ids (hb_hashmap_t<hb_tag_t, float> *user_axes_location,
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hb_set_t *nameids /* IN/OUT */) const
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{
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if (!has_data ()) return;
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hb_map_t pinned_axes;
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auto axis_records = get_axes ();
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for (unsigned i = 0 ; i < (unsigned)axisCount; i++)
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{
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hb_tag_t axis_tag = axis_records[i].get_axis_tag ();
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if (user_axes_location->has (axis_tag))
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{
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pinned_axes.set (i, axis_tag);
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continue;
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}
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nameids->add (axis_records[i].get_name_id ());
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}
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for (unsigned i = 0 ; i < (unsigned)instanceCount; i++)
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{
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const InstanceRecord *instance = get_instance (i);
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if (hb_any (+ hb_zip (instance->get_coordinates (axisCount), hb_range ((unsigned)axisCount))
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| hb_filter (pinned_axes, hb_second)
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| hb_map ([&] (const hb_pair_t<const HBFixed&, unsigned>& _)
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{
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hb_tag_t axis_tag = pinned_axes.get (_.second);
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float location = user_axes_location->get (axis_tag);
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if (fabs ((double)location - (double)_.first.to_float ()) > 0.001) return true;
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return false;
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})
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))
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continue;
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nameids->add (instance->subfamilyNameID);
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if (instanceSize >= axisCount * 4 + 6)
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{
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unsigned post_script_name_id = StructAfter<NameID> (instance->get_coordinates (axisCount));
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if (post_script_name_id != HB_OT_NAME_ID_INVALID) nameids->add (post_script_name_id);
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}
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}
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}
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bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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unsigned retained_axis_count = c->plan->axes_index_map->get_population ();
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if (!retained_axis_count) //all axes are pinned
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return_trace (false);
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fvar *out = c->serializer->embed (this);
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if (unlikely (!out)) return_trace (false);
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if (!c->serializer->check_assign (out->axisCount, retained_axis_count, HB_SERIALIZE_ERROR_INT_OVERFLOW))
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return_trace (false);
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bool has_postscript_nameid = false;
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if (instanceSize >= axisCount * 4 + 6)
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has_postscript_nameid = true;
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if (!c->serializer->check_assign (out->instanceSize, retained_axis_count * 4 + (has_postscript_nameid ? 6 : 4),
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HB_SERIALIZE_ERROR_INT_OVERFLOW))
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return_trace (false);
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auto axes_records = get_axes ();
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for (unsigned i = 0 ; i < (unsigned)axisCount; i++)
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{
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if (!c->plan->axes_index_map->has (i)) continue;
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if (unlikely (!c->serializer->embed (axes_records[i])))
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return_trace (false);
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}
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if (!c->serializer->check_assign (out->firstAxis, get_size (), HB_SERIALIZE_ERROR_INT_OVERFLOW))
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return_trace (false);
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for (unsigned i = 0 ; i < (unsigned)instanceCount; i++)
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{
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const InstanceRecord *instance = get_instance (i);
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auto snap = c->serializer->snapshot ();
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if (!instance->subset (c, axisCount, has_postscript_nameid))
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c->serializer->revert (snap);
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}
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return_trace (true);
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}
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public:
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hb_array_t<const AxisRecord> get_axes () const
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{ return hb_array (&(this+firstAxis), axisCount); }
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const InstanceRecord *get_instance (unsigned int i) const
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{
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if (unlikely (i >= instanceCount)) return nullptr;
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return &StructAtOffset<InstanceRecord> (&StructAfter<InstanceRecord> (get_axes ()),
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i * instanceSize);
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}
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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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Offset16To<AxisRecord>
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firstAxis; /* 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(HBFixed) + 4, or to
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* axisCount * sizeof(HBFixed) + 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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