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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file system_fonts.h
* @brief Provides the system font configurations.
*
* These APIs provides the list of system installed font files with additional metadata about the
* font.
*
* The ASystemFontIterator_open method will give you an iterator which can iterate all system
* installed font files as shown in the following example.
*
* \code{.cpp}
* ASystemFontIterator* iterator = ASystemFontIterator_open();
* ASystemFont* font = NULL;
*
* while ((font = ASystemFontIterator_next(iterator)) != nullptr) {
* // Look if the font is your desired one.
* if (ASystemFont_getWeight(font) == 400 && !ASystemFont_isItalic(font)
* && ASystemFont_getLocale(font) == NULL) {
* break;
* }
* ASystemFont_close(font);
* }
* ASystemFontIterator_close(iterator);
*
* int fd = open(ASystemFont_getFontFilePath(font), O_RDONLY);
* int collectionIndex = ASystemFont_getCollectionINdex(font);
* std::vector<std::pair<uint32_t, float>> variationSettings;
* for (size_t i = 0; i < ASystemFont_getAxisCount(font); ++i) {
* variationSettings.push_back(std::make_pair(
* ASystemFont_getAxisTag(font, i),
* ASystemFont_getAxisValue(font, i)));
* }
* ASystemFont_close(font);
*
* // Use this font for your text rendering engine.
*
* \endcode
*
* Available since API level 29.
*/
#ifndef ANDROID_SYSTEM_FONTS_H
#define ANDROID_SYSTEM_FONTS_H
#include <stdbool.h>
#include <stddef.h>
#include <sys/cdefs.h>
#include <android/font.h>
/******************************************************************
*
* IMPORTANT NOTICE:
*
* This file is part of Android's set of stable system headers
* exposed by the Android NDK (Native Development Kit).
*
* Third-party source AND binary code relies on the definitions
* here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES.
*
* - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES)
* - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS
* - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY
* - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES
*/
__BEGIN_DECLS
#if __ANDROID_API__ >= 29
/**
* ASystemFontIterator provides access to the system font configuration.
*
* ASystemFontIterator is an iterator for all available system font settings.
* This iterator is not a thread-safe object. Do not pass this iterator to other threads.
*/
struct ASystemFontIterator;
/**
* Create a system font iterator.
*
* Use ASystemFont_close() to close the iterator.
*
* \return a pointer for a newly allocated iterator, nullptr on failure.
*/
ASystemFontIterator* _Nullable ASystemFontIterator_open() __INTRODUCED_IN(29);
/**
* Close an opened system font iterator, freeing any related resources.
*
* \param iterator a pointer of an iterator for the system fonts. Do nothing if NULL is passed.
*/
void ASystemFontIterator_close(ASystemFontIterator* _Nullable iterator) __INTRODUCED_IN(29);
/**
* Move to the next system font.
*
* \param iterator an iterator for the system fonts. Passing NULL is not allowed.
* \return a font. If no more font is available, returns nullptr. You need to release the returned
* font by ASystemFont_close when it is no longer needed.
*/
AFont* _Nullable ASystemFontIterator_next(ASystemFontIterator* _Nonnull iterator) __INTRODUCED_IN(29);
#endif // __ANDROID_API__ >= 29
__END_DECLS
#endif // ANDROID_SYSTEM_FONTS_H
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