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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-var.cc')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-var.cc | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-var.cc b/gfx/harfbuzz/src/hb-ot-var.cc new file mode 100644 index 0000000000..f000f27263 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-var.cc @@ -0,0 +1,328 @@ +/* + * 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 + */ + +#include "hb.hh" + +#ifndef HB_NO_VAR + +#include "hb-ot-var.h" + +#include "hb-ot-var-avar-table.hh" +#include "hb-ot-var-fvar-table.hh" +#include "hb-ot-var-mvar-table.hh" + + +/** + * SECTION:hb-ot-var + * @title: hb-ot-var + * @short_description: OpenType Font Variations + * @include: hb-ot.h + * + * Functions for fetching information about OpenType Variable Fonts. + **/ + + +/* + * fvar/avar + */ + + +/** + * hb_ot_var_has_data: + * @face: The #hb_face_t to work on + * + * Tests whether a face includes any OpenType variation data in the `fvar` table. + * + * Return value: `true` if data found, `false` otherwise + * + * Since: 1.4.2 + **/ +hb_bool_t +hb_ot_var_has_data (hb_face_t *face) +{ + return face->table.fvar->has_data (); +} + +/** + * hb_ot_var_get_axis_count: + * @face: The #hb_face_t to work on + * + * Fetches the number of OpenType variation axes included in the face. + * + * Return value: the number of variation axes defined + * + * Since: 1.4.2 + **/ +unsigned int +hb_ot_var_get_axis_count (hb_face_t *face) +{ + return face->table.fvar->get_axis_count (); +} + +#ifndef HB_DISABLE_DEPRECATED +/** + * hb_ot_var_get_axes: + * @face: #hb_face_t to work upon + * @start_offset: offset of the first lookup to retrieve + * @axes_count: (inout) (optional): Input = the maximum number of variation axes to return; + * Output = the actual number of variation axes returned (may be zero) + * @axes_array: (out caller-allocates) (array length=axes_count): The array of variation axes found + * + * Fetches a list of all variation axes in the specified face. The list returned will begin + * at the offset provided. + * + * Since: 1.4.2 + * Deprecated: 2.2.0: use hb_ot_var_get_axis_infos() instead + **/ +unsigned int +hb_ot_var_get_axes (hb_face_t *face, + unsigned int start_offset, + unsigned int *axes_count /* IN/OUT */, + hb_ot_var_axis_t *axes_array /* OUT */) +{ + return face->table.fvar->get_axes_deprecated (start_offset, axes_count, axes_array); +} + +/** + * hb_ot_var_find_axis: + * @face: #hb_face_t to work upon + * @axis_tag: The #hb_tag_t of the variation axis to query + * @axis_index: The index of the variation axis + * @axis_info: (out): The #hb_ot_var_axis_info_t of the axis tag queried + * + * Fetches the variation-axis information corresponding to the specified axis tag + * in the specified face. + * + * Since: 1.4.2 + * Deprecated: 2.2.0 - use hb_ot_var_find_axis_info() instead + **/ +hb_bool_t +hb_ot_var_find_axis (hb_face_t *face, + hb_tag_t axis_tag, + unsigned int *axis_index, + hb_ot_var_axis_t *axis_info) +{ + return face->table.fvar->find_axis_deprecated (axis_tag, axis_index, axis_info); +} +#endif + +/** + * hb_ot_var_get_axis_infos: + * @face: #hb_face_t to work upon + * @start_offset: offset of the first lookup to retrieve + * @axes_count: (inout) (optional): Input = the maximum number of variation axes to return; + * Output = the actual number of variation axes returned (may be zero) + * @axes_array: (out caller-allocates) (array length=axes_count): The array of variation axes found + * + * Fetches a list of all variation axes in the specified face. The list returned will begin + * at the offset provided. + * + * Return value: the number of variation axes in the face + * + * Since: 2.2.0 + **/ +HB_EXTERN unsigned int +hb_ot_var_get_axis_infos (hb_face_t *face, + unsigned int start_offset, + unsigned int *axes_count /* IN/OUT */, + hb_ot_var_axis_info_t *axes_array /* OUT */) +{ + return face->table.fvar->get_axis_infos (start_offset, axes_count, axes_array); +} + +/** + * hb_ot_var_find_axis_info: + * @face: #hb_face_t to work upon + * @axis_tag: The #hb_tag_t of the variation axis to query + * @axis_info: (out): The #hb_ot_var_axis_info_t of the axis tag queried + * + * Fetches the variation-axis information corresponding to the specified axis tag + * in the specified face. + * + * Return value: `true` if data found, `false` otherwise + * + * Since: 2.2.0 + **/ +HB_EXTERN hb_bool_t +hb_ot_var_find_axis_info (hb_face_t *face, + hb_tag_t axis_tag, + hb_ot_var_axis_info_t *axis_info) +{ + return face->table.fvar->find_axis_info (axis_tag, axis_info); +} + + +/* + * Named instances. + */ + +/** + * hb_ot_var_get_named_instance_count: + * @face: The #hb_face_t to work on + * + * Fetches the number of named instances included in the face. + * + * Return value: the number of named instances defined + * + * Since: 2.2.0 + **/ +unsigned int +hb_ot_var_get_named_instance_count (hb_face_t *face) +{ + return face->table.fvar->get_instance_count (); +} + +/** + * hb_ot_var_named_instance_get_subfamily_name_id: + * @face: The #hb_face_t to work on + * @instance_index: The index of the named instance to query + * + * Fetches the `name` table Name ID that provides display names for + * the "Subfamily name" defined for the given named instance in the face. + * + * Return value: the Name ID found for the Subfamily name + * + * Since: 2.2.0 + **/ +hb_ot_name_id_t +hb_ot_var_named_instance_get_subfamily_name_id (hb_face_t *face, + unsigned int instance_index) +{ + return face->table.fvar->get_instance_subfamily_name_id (instance_index); +} + +/** + * hb_ot_var_named_instance_get_postscript_name_id: + * @face: The #hb_face_t to work on + * @instance_index: The index of the named instance to query + * + * Fetches the `name` table Name ID that provides display names for + * the "PostScript name" defined for the given named instance in the face. + * + * Return value: the Name ID found for the PostScript name + * + * Since: 2.2.0 + **/ +hb_ot_name_id_t +hb_ot_var_named_instance_get_postscript_name_id (hb_face_t *face, + unsigned int instance_index) +{ + return face->table.fvar->get_instance_postscript_name_id (instance_index); +} + +/** + * hb_ot_var_named_instance_get_design_coords: + * @face: The #hb_face_t to work on + * @instance_index: The index of the named instance to query + * @coords_length: (inout) (optional): Input = the maximum number of coordinates to return; + * Output = the actual number of coordinates returned (may be zero) + * @coords: (out) (array length=coords_length): The array of coordinates found for the query + * + * Fetches the design-space coordinates corresponding to the given + * named instance in the face. + * + * Return value: the number of variation axes in the face + * + * Since: 2.2.0 + **/ +unsigned int +hb_ot_var_named_instance_get_design_coords (hb_face_t *face, + unsigned int instance_index, + unsigned int *coords_length, /* IN/OUT */ + float *coords /* OUT */) +{ + return face->table.fvar->get_instance_coords (instance_index, coords_length, coords); +} + + +/** + * hb_ot_var_normalize_variations: + * @face: The #hb_face_t to work on + * @variations: The array of variations to normalize + * @variations_length: The number of variations to normalize + * @coords: (out) (array length=coords_length): The array of normalized coordinates + * @coords_length: The length of the coordinate array + * + * Normalizes all of the coordinates in the given list of variation axes. + * + * Since: 1.4.2 + **/ +void +hb_ot_var_normalize_variations (hb_face_t *face, + const hb_variation_t *variations, /* IN */ + unsigned int variations_length, + int *coords, /* OUT */ + unsigned int coords_length) +{ + for (unsigned int i = 0; i < coords_length; i++) + coords[i] = 0; + + const OT::fvar &fvar = *face->table.fvar; + for (unsigned int i = 0; i < variations_length; i++) + { + hb_ot_var_axis_info_t info; + if (hb_ot_var_find_axis_info (face, variations[i].tag, &info) && + info.axis_index < coords_length) + coords[info.axis_index] = fvar.normalize_axis_value (info.axis_index, variations[i].value); + } + + face->table.avar->map_coords (coords, coords_length); +} + +/** + * hb_ot_var_normalize_coords: + * @face: The #hb_face_t to work on + * @coords_length: The length of the coordinate array + * @design_coords: The design-space coordinates to normalize + * @normalized_coords: (out): The normalized coordinates + * + * Normalizes the given design-space coordinates. The minimum and maximum + * values for the axis are mapped to the interval [-1,1], with the default + * axis value mapped to 0. + * + * The normalized values have 14 bits of fixed-point sub-integer precision as per + * OpenType specification. + * + * Any additional scaling defined in the face's `avar` table is also + * applied, as described at https://docs.microsoft.com/en-us/typography/opentype/spec/avar + * + * Since: 1.4.2 + **/ +void +hb_ot_var_normalize_coords (hb_face_t *face, + unsigned int coords_length, + const float *design_coords, /* IN */ + int *normalized_coords /* OUT */) +{ + const OT::fvar &fvar = *face->table.fvar; + for (unsigned int i = 0; i < coords_length; i++) + normalized_coords[i] = fvar.normalize_axis_value (i, design_coords[i]); + + face->table.avar->map_coords (normalized_coords, coords_length); +} + + +#endif |