326 lines
9.7 KiB
C++
326 lines
9.7 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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#include "hb.hh"
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#ifndef HB_NO_VAR
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#include "hb-ot-var.h"
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#include "hb-ot-var-avar-table.hh"
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#include "hb-ot-var-fvar-table.hh"
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#include "hb-ot-var-mvar-table.hh"
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/**
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* SECTION:hb-ot-var
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* @title: hb-ot-var
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* @short_description: OpenType Font Variations
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* @include: hb-ot.h
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*
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* Functions for fetching information about OpenType Variable Fonts.
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**/
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/*
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* fvar/avar
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*/
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/**
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* hb_ot_var_has_data:
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* @face: The #hb_face_t to work on
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*
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* Tests whether a face includes any OpenType variation data in the `fvar` table.
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*
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* Return value: %true if data found, %false otherwise
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*
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* Since: 1.4.2
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**/
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hb_bool_t
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hb_ot_var_has_data (hb_face_t *face)
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{
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return face->table.fvar->has_data ();
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}
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/**
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* hb_ot_var_get_axis_count:
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* @face: The #hb_face_t to work on
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*
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* Fetches the number of OpenType variation axes included in the face.
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*
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* Return value: the number of variation axes defined
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*
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* Since: 1.4.2
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**/
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unsigned int
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hb_ot_var_get_axis_count (hb_face_t *face)
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{
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return face->table.fvar->get_axis_count ();
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}
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#ifndef HB_DISABLE_DEPRECATED
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/**
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* hb_ot_var_get_axes:
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* @face: #hb_face_t to work upon
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* @start_offset: offset of the first lookup to retrieve
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* @axes_count: (inout) (optional): Input = the maximum number of variation axes to return;
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* Output = the actual number of variation axes returned (may be zero)
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* @axes_array: (out caller-allocates) (array length=axes_count): The array of variation axes found
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*
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* Fetches a list of all variation axes in the specified face. The list returned will begin
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* at the offset provided.
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*
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* Since: 1.4.2
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* Deprecated: 2.2.0: use hb_ot_var_get_axis_infos() instead
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**/
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unsigned int
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hb_ot_var_get_axes (hb_face_t *face,
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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 */)
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{
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return face->table.fvar->get_axes_deprecated (start_offset, axes_count, axes_array);
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}
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/**
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* hb_ot_var_find_axis:
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* @face: #hb_face_t to work upon
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* @axis_tag: The #hb_tag_t of the variation axis to query
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* @axis_index: The index of the variation axis
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* @axis_info: (out): The #hb_ot_var_axis_info_t of the axis tag queried
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*
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* Fetches the variation-axis information corresponding to the specified axis tag
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* in the specified face.
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*
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* Since: 1.4.2
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* Deprecated: 2.2.0 - use hb_ot_var_find_axis_info() instead
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**/
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hb_bool_t
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hb_ot_var_find_axis (hb_face_t *face,
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hb_tag_t axis_tag,
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unsigned int *axis_index,
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hb_ot_var_axis_t *axis_info)
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{
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return face->table.fvar->find_axis_deprecated (axis_tag, axis_index, axis_info);
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}
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#endif
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/**
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* hb_ot_var_get_axis_infos:
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* @face: #hb_face_t to work upon
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* @start_offset: offset of the first lookup to retrieve
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* @axes_count: (inout) (optional): Input = the maximum number of variation axes to return;
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* Output = the actual number of variation axes returned (may be zero)
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* @axes_array: (out caller-allocates) (array length=axes_count): The array of variation axes found
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*
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* Fetches a list of all variation axes in the specified face. The list returned will begin
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* at the offset provided.
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*
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* Return value: the number of variation axes in the face
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*
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* Since: 2.2.0
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**/
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HB_EXTERN unsigned int
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hb_ot_var_get_axis_infos (hb_face_t *face,
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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 */)
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{
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return face->table.fvar->get_axis_infos (start_offset, axes_count, axes_array);
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}
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/**
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* hb_ot_var_find_axis_info:
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* @face: #hb_face_t to work upon
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* @axis_tag: The #hb_tag_t of the variation axis to query
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* @axis_info: (out): The #hb_ot_var_axis_info_t of the axis tag queried
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*
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* Fetches the variation-axis information corresponding to the specified axis tag
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* in the specified face.
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*
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* Return value: %true if data found, %false otherwise
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*
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* Since: 2.2.0
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**/
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HB_EXTERN hb_bool_t
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hb_ot_var_find_axis_info (hb_face_t *face,
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hb_tag_t axis_tag,
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hb_ot_var_axis_info_t *axis_info)
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{
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return face->table.fvar->find_axis_info (axis_tag, axis_info);
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}
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/*
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* Named instances.
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*/
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/**
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* hb_ot_var_get_named_instance_count:
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* @face: The #hb_face_t to work on
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*
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* Fetches the number of named instances included in the face.
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*
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* Return value: the number of named instances defined
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*
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* Since: 2.2.0
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**/
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unsigned int
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hb_ot_var_get_named_instance_count (hb_face_t *face)
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{
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return face->table.fvar->get_instance_count ();
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}
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/**
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* hb_ot_var_named_instance_get_subfamily_name_id:
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* @face: The #hb_face_t to work on
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* @instance_index: The index of the named instance to query
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*
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* Fetches the `name` table Name ID that provides display names for
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* the "Subfamily name" defined for the given named instance in the face.
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*
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* Return value: the Name ID found for the Subfamily name
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*
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* Since: 2.2.0
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**/
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hb_ot_name_id_t
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hb_ot_var_named_instance_get_subfamily_name_id (hb_face_t *face,
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unsigned int instance_index)
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{
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return face->table.fvar->get_instance_subfamily_name_id (instance_index);
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}
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/**
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* hb_ot_var_named_instance_get_postscript_name_id:
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* @face: The #hb_face_t to work on
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* @instance_index: The index of the named instance to query
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*
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* Fetches the `name` table Name ID that provides display names for
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* the "PostScript name" defined for the given named instance in the face.
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*
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* Return value: the Name ID found for the PostScript name
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*
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* Since: 2.2.0
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**/
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hb_ot_name_id_t
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hb_ot_var_named_instance_get_postscript_name_id (hb_face_t *face,
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unsigned int instance_index)
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{
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return face->table.fvar->get_instance_postscript_name_id (instance_index);
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}
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/**
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* hb_ot_var_named_instance_get_design_coords:
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* @face: The #hb_face_t to work on
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* @instance_index: The index of the named instance to query
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* @coords_length: (inout) (optional): Input = the maximum number of coordinates to return;
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* Output = the actual number of coordinates returned (may be zero)
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* @coords: (out) (array length=coords_length): The array of coordinates found for the query
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*
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* Fetches the design-space coordinates corresponding to the given
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* named instance in the face.
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*
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* Return value: the number of variation axes in the face
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*
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* Since: 2.2.0
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**/
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unsigned int
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hb_ot_var_named_instance_get_design_coords (hb_face_t *face,
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unsigned int instance_index,
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unsigned int *coords_length, /* IN/OUT */
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float *coords /* OUT */)
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{
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return face->table.fvar->get_instance_coords (instance_index, coords_length, coords);
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}
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/**
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* hb_ot_var_normalize_variations:
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* @face: The #hb_face_t to work on
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* @variations: The array of variations to normalize
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* @variations_length: The number of variations to normalize
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* @coords: (out) (array length=coords_length): The array of normalized coordinates
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* @coords_length: The length of the coordinate array
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*
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* Normalizes all of the coordinates in the given list of variation axes.
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*
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* Since: 1.4.2
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**/
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void
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hb_ot_var_normalize_variations (hb_face_t *face,
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const hb_variation_t *variations, /* IN */
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unsigned int variations_length,
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int *coords, /* OUT */
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unsigned int coords_length)
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{
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for (unsigned int i = 0; i < coords_length; i++)
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coords[i] = 0;
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const OT::fvar &fvar = *face->table.fvar;
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for (unsigned int i = 0; i < variations_length; i++)
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{
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hb_ot_var_axis_info_t info;
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if (hb_ot_var_find_axis_info (face, variations[i].tag, &info) &&
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info.axis_index < coords_length)
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coords[info.axis_index] = fvar.normalize_axis_value (info.axis_index, variations[i].value);
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}
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face->table.avar->map_coords (coords, coords_length);
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}
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/**
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* hb_ot_var_normalize_coords:
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* @face: The #hb_face_t to work on
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* @coords_length: The length of the coordinate array
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* @design_coords: The design-space coordinates to normalize
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* @normalized_coords: (out): The normalized coordinates
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*
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* Normalizes the given design-space coordinates. The minimum and maximum
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* values for the axis are mapped to the interval [-1,1], with the default
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* axis value mapped to 0.
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*
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* Any additional scaling defined in the face's `avar` table is also
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* applied, as described at https://docs.microsoft.com/en-us/typography/opentype/spec/avar
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*
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* Since: 1.4.2
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**/
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void
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hb_ot_var_normalize_coords (hb_face_t *face,
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unsigned int coords_length,
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const float *design_coords, /* IN */
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int *normalized_coords /* OUT */)
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{
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const OT::fvar &fvar = *face->table.fvar;
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for (unsigned int i = 0; i < coords_length; i++)
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normalized_coords[i] = fvar.normalize_axis_value (i, design_coords[i]);
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face->table.avar->map_coords (normalized_coords, coords_length);
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}
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#endif
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