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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-var-fvar-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-var-fvar-table.hh | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-var-fvar-table.hh b/gfx/harfbuzz/src/hb-ot-var-fvar-table.hh new file mode 100644 index 0000000000..f9e933fb2b --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-var-fvar-table.hh @@ -0,0 +1,327 @@ +/* + * 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.hh" + +/* + * fvar -- Font Variations + * https://docs.microsoft.com/en-us/typography/opentype/spec/fvar + */ + +#define HB_OT_TAG_fvar HB_TAG('f','v','a','r') + + +namespace OT { + + +struct InstanceRecord +{ + friend struct fvar; + + hb_array_t<const HBFixed> get_coordinates (unsigned int axis_count) const + { return coordinatesZ.as_array (axis_count); } + + bool sanitize (hb_sanitize_context_t *c, unsigned int axis_count) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + c->check_array (coordinatesZ.arrayZ, axis_count)); + } + + protected: + NameID subfamilyNameID;/* The name ID for entries in the 'name' table + * that provide subfamily names for this instance. */ + HBUINT16 flags; /* Reserved for future use — set to 0. */ + UnsizedArrayOf<HBFixed> + coordinatesZ; /* The coordinates array for this instance. */ + //NameID postScriptNameIDX;/*Optional. The name ID for entries in the 'name' + // * table that provide PostScript names for this + // * instance. */ + + public: + DEFINE_SIZE_UNBOUNDED (4); +}; + +struct AxisRecord +{ + int cmp (hb_tag_t key) const { return axisTag.cmp (key); } + + enum + { + AXIS_FLAG_HIDDEN = 0x0001, + }; + +#ifndef HB_DISABLE_DEPRECATED + void get_axis_deprecated (hb_ot_var_axis_t *info) const + { + info->tag = axisTag; + info->name_id = axisNameID; + get_coordinates (info->min_value, info->default_value, info->max_value); + } +#endif + + void get_axis_info (unsigned axis_index, hb_ot_var_axis_info_t *info) const + { + info->axis_index = axis_index; + info->tag = axisTag; + info->name_id = axisNameID; + info->flags = (hb_ot_var_axis_flags_t) (unsigned int) flags; + get_coordinates (info->min_value, info->default_value, info->max_value); + info->reserved = 0; + } + + int normalize_axis_value (float v) const + { + float min_value, default_value, max_value; + get_coordinates (min_value, default_value, max_value); + + v = hb_clamp (v, min_value, max_value); + + if (v == default_value) + return 0; + else if (v < default_value) + v = (v - default_value) / (default_value - min_value); + else + v = (v - default_value) / (max_value - default_value); + return roundf (v * 16384.f); + } + + float unnormalize_axis_value (int v) const + { + float min_value, default_value, max_value; + get_coordinates (min_value, default_value, max_value); + + if (v == 0) + return default_value; + else if (v < 0) + return v * (default_value - min_value) / 16384.f + default_value; + else + return v * (max_value - default_value) / 16384.f + default_value; + } + + hb_ot_name_id_t get_name_id () const { return axisNameID; } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + protected: + void get_coordinates (float &min, float &default_, float &max) const + { + default_ = defaultValue / 65536.f; + /* Ensure order, to simplify client math. */ + min = hb_min (default_, minValue / 65536.f); + max = hb_max (default_, maxValue / 65536.f); + } + + protected: + Tag axisTag; /* Tag identifying the design variation for the axis. */ + HBFixed minValue; /* The minimum coordinate value for the axis. */ + HBFixed defaultValue; /* The default coordinate value for the axis. */ + HBFixed maxValue; /* The maximum coordinate value for the axis. */ + HBUINT16 flags; /* Axis flags. */ + NameID axisNameID; /* The name ID for entries in the 'name' table that + * provide a display name for this axis. */ + + public: + DEFINE_SIZE_STATIC (20); +}; + +struct fvar +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_fvar; + + bool has_data () const { return version.to_int (); } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (version.sanitize (c) && + likely (version.major == 1) && + c->check_struct (this) && + axisSize == 20 && /* Assumed in our code. */ + instanceSize >= axisCount * 4 + 4 && + get_axes ().sanitize (c) && + c->check_range (get_instance (0), instanceCount, instanceSize)); + } + + unsigned int get_axis_count () const { return axisCount; } + +#ifndef HB_DISABLE_DEPRECATED + unsigned int get_axes_deprecated (unsigned int start_offset, + unsigned int *axes_count /* IN/OUT */, + hb_ot_var_axis_t *axes_array /* OUT */) const + { + if (axes_count) + { + hb_array_t<const AxisRecord> arr = get_axes ().sub_array (start_offset, axes_count); + for (unsigned i = 0; i < arr.length; ++i) + arr[i].get_axis_deprecated (&axes_array[i]); + } + return axisCount; + } +#endif + + unsigned int get_axis_infos (unsigned int start_offset, + unsigned int *axes_count /* IN/OUT */, + hb_ot_var_axis_info_t *axes_array /* OUT */) const + { + if (axes_count) + { + hb_array_t<const AxisRecord> arr = get_axes ().sub_array (start_offset, axes_count); + for (unsigned i = 0; i < arr.length; ++i) + arr[i].get_axis_info (start_offset + i, &axes_array[i]); + } + return axisCount; + } + +#ifndef HB_DISABLE_DEPRECATED + bool + find_axis_deprecated (hb_tag_t tag, unsigned *axis_index, hb_ot_var_axis_t *info) const + { + unsigned i; + if (!axis_index) axis_index = &i; + *axis_index = HB_OT_VAR_NO_AXIS_INDEX; + auto axes = get_axes (); + return axes.lfind (tag, axis_index) && (axes[*axis_index].get_axis_deprecated (info), true); + } +#endif + + bool + find_axis_info (hb_tag_t tag, hb_ot_var_axis_info_t *info) const + { + unsigned i; + auto axes = get_axes (); + return axes.lfind (tag, &i) && (axes[i].get_axis_info (i, info), true); + } + + int normalize_axis_value (unsigned int axis_index, float v) const + { return get_axes ()[axis_index].normalize_axis_value (v); } + + float unnormalize_axis_value (unsigned int axis_index, int v) const + { return get_axes ()[axis_index].unnormalize_axis_value (v); } + + unsigned int get_instance_count () const { return instanceCount; } + + hb_ot_name_id_t get_instance_subfamily_name_id (unsigned int instance_index) const + { + const InstanceRecord *instance = get_instance (instance_index); + if (unlikely (!instance)) return HB_OT_NAME_ID_INVALID; + return instance->subfamilyNameID; + } + + hb_ot_name_id_t get_instance_postscript_name_id (unsigned int instance_index) const + { + const InstanceRecord *instance = get_instance (instance_index); + if (unlikely (!instance)) return HB_OT_NAME_ID_INVALID; + if (instanceSize >= axisCount * 4 + 6) + return StructAfter<NameID> (instance->get_coordinates (axisCount)); + return HB_OT_NAME_ID_INVALID; + } + + unsigned int get_instance_coords (unsigned int instance_index, + unsigned int *coords_length, /* IN/OUT */ + float *coords /* OUT */) const + { + const InstanceRecord *instance = get_instance (instance_index); + if (unlikely (!instance)) + { + if (coords_length) + *coords_length = 0; + return 0; + } + + if (coords_length && *coords_length) + { + hb_array_t<const HBFixed> instanceCoords = instance->get_coordinates (axisCount) + .sub_array (0, *coords_length); + for (unsigned int i = 0; i < instanceCoords.length; i++) + coords[i] = instanceCoords.arrayZ[i].to_float (); + } + return axisCount; + } + + void collect_name_ids (hb_set_t *nameids) const + { + if (!has_data ()) return; + + + get_axes () + | hb_map (&AxisRecord::get_name_id) + | hb_sink (nameids) + ; + + + hb_range ((unsigned) instanceCount) + | hb_map ([this] (const unsigned _) { return get_instance_subfamily_name_id (_); }) + | hb_sink (nameids) + ; + + + hb_range ((unsigned) instanceCount) + | hb_map ([this] (const unsigned _) { return get_instance_postscript_name_id (_); }) + | hb_sink (nameids) + ; + } + + protected: + hb_array_t<const AxisRecord> get_axes () const + { return hb_array (&(this+firstAxis), axisCount); } + + const InstanceRecord *get_instance (unsigned int i) const + { + if (unlikely (i >= instanceCount)) return nullptr; + return &StructAtOffset<InstanceRecord> (&StructAfter<InstanceRecord> (get_axes ()), + i * instanceSize); + } + + protected: + FixedVersion<>version; /* Version of the fvar table + * initially set to 0x00010000u */ + OffsetTo<AxisRecord> + firstAxis; /* Offset in bytes from the beginning of the table + * to the start of the AxisRecord array. */ + HBUINT16 reserved; /* This field is permanently reserved. Set to 2. */ + HBUINT16 axisCount; /* The number of variation axes in the font (the + * number of records in the axes array). */ + HBUINT16 axisSize; /* The size in bytes of each VariationAxisRecord — + * set to 20 (0x0014) for this version. */ + HBUINT16 instanceCount; /* The number of named instances defined in the font + * (the number of records in the instances array). */ + HBUINT16 instanceSize; /* The size in bytes of each InstanceRecord — set + * to either axisCount * sizeof(HBFixed) + 4, or to + * axisCount * sizeof(HBFixed) + 6. */ + + public: + DEFINE_SIZE_STATIC (16); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_VAR_FVAR_TABLE_HH */ |