323 lines
8.7 KiB
C++
323 lines
8.7 KiB
C++
/*
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* Copyright © 2016 Google, Inc.
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* Copyright © 2018 Ebrahim Byagowi
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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): Sascha Brawer, Behdad Esfahbod
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*/
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#include "hb.hh"
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#ifndef HB_NO_COLOR
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#include "hb-ot.h"
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#include "hb-ot-color-cbdt-table.hh"
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#include "hb-ot-color-colr-table.hh"
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#include "hb-ot-color-cpal-table.hh"
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#include "hb-ot-color-sbix-table.hh"
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#include "hb-ot-color-svg-table.hh"
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/**
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* SECTION:hb-ot-color
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* @title: hb-ot-color
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* @short_description: OpenType Color Fonts
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* @include: hb-ot.h
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*
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* Functions for fetching color-font information from OpenType font faces.
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*
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* HarfBuzz supports `COLR`/`CPAL`, `sbix`, `CBDT`, and `SVG` color fonts.
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**/
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/*
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* CPAL
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*/
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/**
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* hb_ot_color_has_palettes:
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* @face: #hb_face_t to work upon
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*
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* Tests whether a face includes a `CPAL` color-palette 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: 2.1.0
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*/
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hb_bool_t
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hb_ot_color_has_palettes (hb_face_t *face)
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{
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return face->table.CPAL->has_data ();
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}
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/**
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* hb_ot_color_palette_get_count:
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* @face: #hb_face_t to work upon
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*
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* Fetches the number of color palettes in a face.
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*
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* Return value: the number of palettes found
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*
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* Since: 2.1.0
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*/
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unsigned int
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hb_ot_color_palette_get_count (hb_face_t *face)
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{
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return face->table.CPAL->get_palette_count ();
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}
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/**
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* hb_ot_color_palette_get_name_id:
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* @face: #hb_face_t to work upon
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* @palette_index: The index of the color palette
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*
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* Fetches the `name` table Name ID that provides display names for
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* a `CPAL` color palette.
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*
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* Palette display names can be generic (e.g., "Default") or provide
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* specific, themed names (e.g., "Spring", "Summer", "Fall", and "Winter").
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*
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* Return value: the Named ID found for the palette.
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* If the requested palette has no name the result is #HB_OT_NAME_ID_INVALID.
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*
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* Since: 2.1.0
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*/
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hb_ot_name_id_t
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hb_ot_color_palette_get_name_id (hb_face_t *face,
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unsigned int palette_index)
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{
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return face->table.CPAL->get_palette_name_id (palette_index);
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}
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/**
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* hb_ot_color_palette_color_get_name_id:
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* @face: #hb_face_t to work upon
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* @color_index: The index of the color
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*
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* Fetches the `name` table Name ID that provides display names for
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* the specified color in a face's `CPAL` color palette.
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*
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* Display names can be generic (e.g., "Background") or specific
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* (e.g., "Eye color").
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*
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* Return value: the Name ID found for the color.
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*
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* Since: 2.1.0
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*/
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hb_ot_name_id_t
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hb_ot_color_palette_color_get_name_id (hb_face_t *face,
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unsigned int color_index)
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{
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return face->table.CPAL->get_color_name_id (color_index);
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}
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/**
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* hb_ot_color_palette_get_flags:
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* @face: #hb_face_t to work upon
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* @palette_index: The index of the color palette
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*
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* Fetches the flags defined for a color palette.
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*
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* Return value: the #hb_ot_color_palette_flags_t of the requested color palette
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*
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* Since: 2.1.0
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*/
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hb_ot_color_palette_flags_t
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hb_ot_color_palette_get_flags (hb_face_t *face,
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unsigned int palette_index)
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{
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return face->table.CPAL->get_palette_flags (palette_index);
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}
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/**
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* hb_ot_color_palette_get_colors:
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* @face: #hb_face_t to work upon
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* @palette_index: the index of the color palette to query
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* @start_offset: offset of the first color to retrieve
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* @color_count: (inout) (optional): Input = the maximum number of colors to return;
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* Output = the actual number of colors returned (may be zero)
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* @colors: (out) (array length=color_count) (nullable): The array of #hb_color_t records found
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*
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* Fetches a list of the colors in a color palette.
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*
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* After calling this function, @colors will be filled with the palette
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* colors. If @colors is NULL, the function will just return the number
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* of total colors without storing any actual colors; this can be used
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* for allocating a buffer of suitable size before calling
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* hb_ot_color_palette_get_colors() a second time.
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*
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* Return value: the total number of colors in the palette
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*
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* Since: 2.1.0
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*/
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unsigned int
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hb_ot_color_palette_get_colors (hb_face_t *face,
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unsigned int palette_index,
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unsigned int start_offset,
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unsigned int *colors_count /* IN/OUT. May be NULL. */,
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hb_color_t *colors /* OUT. May be NULL. */)
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{
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return face->table.CPAL->get_palette_colors (palette_index, start_offset, colors_count, colors);
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}
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/*
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* COLR
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*/
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/**
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* hb_ot_color_has_layers:
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* @face: #hb_face_t to work upon
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*
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* Tests whether a face includes any `COLR` color layers.
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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: 2.1.0
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*/
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hb_bool_t
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hb_ot_color_has_layers (hb_face_t *face)
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{
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return face->table.COLR->has_data ();
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}
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/**
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* hb_ot_color_glyph_get_layers:
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* @face: #hb_face_t to work upon
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* @glyph: The glyph index to query
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* @start_offset: offset of the first layer to retrieve
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* @layer_count: (inout) (optional): Input = the maximum number of layers to return;
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* Output = the actual number of layers returned (may be zero)
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* @layers: (out) (array length=layer_count) (nullable): The array of layers found
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*
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* Fetches a list of all color layers for the specified glyph index in the specified
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* face. The list returned will begin at the offset provided.
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*
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* Return value: Total number of layers available for the glyph index queried
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*
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* Since: 2.1.0
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*/
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unsigned int
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hb_ot_color_glyph_get_layers (hb_face_t *face,
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hb_codepoint_t glyph,
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unsigned int start_offset,
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unsigned int *layer_count, /* IN/OUT. May be NULL. */
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hb_ot_color_layer_t *layers /* OUT. May be NULL. */)
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{
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return face->table.COLR->get_glyph_layers (glyph, start_offset, layer_count, layers);
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}
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/*
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* SVG
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*/
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/**
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* hb_ot_color_has_svg:
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* @face: #hb_face_t to work upon.
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*
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* Tests whether a face includes any `SVG` glyph images.
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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: 2.1.0
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*/
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hb_bool_t
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hb_ot_color_has_svg (hb_face_t *face)
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{
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return face->table.SVG->has_data ();
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}
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/**
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* hb_ot_color_glyph_reference_svg:
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* @face: #hb_face_t to work upon
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* @glyph: a svg glyph index
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*
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* Fetches the SVG document for a glyph. The blob may be either plain text or gzip-encoded.
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*
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* If the glyph has no SVG document, the singleton empty blob is returned.
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*
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* Return value: (transfer full): An #hb_blob_t containing the SVG document of the glyph, if available
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*
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* Since: 2.1.0
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*/
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hb_blob_t *
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hb_ot_color_glyph_reference_svg (hb_face_t *face, hb_codepoint_t glyph)
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{
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return face->table.SVG->reference_blob_for_glyph (glyph);
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}
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/*
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* PNG: CBDT or sbix
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*/
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/**
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* hb_ot_color_has_png:
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* @face: #hb_face_t to work upon
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*
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* Tests whether a face has PNG glyph images (either in `CBDT` or `sbix` tables).
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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: 2.1.0
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*/
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hb_bool_t
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hb_ot_color_has_png (hb_face_t *face)
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{
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return face->table.CBDT->has_data () || face->table.sbix->has_data ();
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}
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/**
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* hb_ot_color_glyph_reference_png:
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* @font: #hb_font_t to work upon
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* @glyph: a glyph index
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*
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* Fetches the PNG image for a glyph. This function takes a font object, not a face object,
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* as input. To get an optimally sized PNG blob, the UPEM value must be set on the @font
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* object. If UPEM is unset, the blob returned will be the largest PNG available.
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*
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* If the glyph has no PNG image, the singleton empty blob is returned.
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*
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* Return value: (transfer full): An #hb_blob_t containing the PNG image for the glyph, if available
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*
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* Since: 2.1.0
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*/
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hb_blob_t *
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hb_ot_color_glyph_reference_png (hb_font_t *font, hb_codepoint_t glyph)
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{
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hb_blob_t *blob = hb_blob_get_empty ();
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if (font->face->table.sbix->has_data ())
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blob = font->face->table.sbix->reference_png (font, glyph, nullptr, nullptr, nullptr);
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if (!blob->length && font->face->table.CBDT->has_data ())
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blob = font->face->table.CBDT->reference_png (font, glyph);
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return blob;
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}
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#endif
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