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132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "Minikin"
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#include "HbFontCache.h"
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#include <log/log.h>
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#include <utils/LruCache.h>
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#include <hb.h>
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#include <hb-ot.h>
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#include <minikin/MinikinFont.h>
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#include "MinikinInternal.h"
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namespace minikin {
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class HbFontCache : private android::OnEntryRemoved<int32_t, hb_font_t*> {
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public:
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HbFontCache() : mCache(kMaxEntries) {
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mCache.setOnEntryRemovedListener(this);
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}
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// callback for OnEntryRemoved
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void operator()(int32_t& /* key */, hb_font_t*& value) {
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hb_font_destroy(value);
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}
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hb_font_t* get(int32_t fontId) {
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return mCache.get(fontId);
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}
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void put(int32_t fontId, hb_font_t* font) {
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mCache.put(fontId, font);
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}
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void clear() {
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mCache.clear();
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}
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void remove(int32_t fontId) {
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mCache.remove(fontId);
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}
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private:
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static const size_t kMaxEntries = 100;
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android::LruCache<int32_t, hb_font_t*> mCache;
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};
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HbFontCache* getFontCacheLocked() {
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assertMinikinLocked();
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static HbFontCache* cache = nullptr;
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if (cache == nullptr) {
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cache = new HbFontCache();
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}
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return cache;
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}
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void purgeHbFontCacheLocked() {
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assertMinikinLocked();
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getFontCacheLocked()->clear();
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}
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void purgeHbFontLocked(const MinikinFont* minikinFont) {
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assertMinikinLocked();
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const int32_t fontId = minikinFont->GetUniqueId();
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getFontCacheLocked()->remove(fontId);
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}
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// Returns a new reference to a hb_font_t object, caller is
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// responsible for calling hb_font_destroy() on it.
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hb_font_t* getHbFontLocked(MinikinFont* minikinFont) {
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assertMinikinLocked();
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// TODO: get rid of nullFaceFont
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static hb_font_t* nullFaceFont = nullptr;
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if (minikinFont == nullptr) {
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if (nullFaceFont == nullptr) {
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nullFaceFont = hb_font_create(nullptr);
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}
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return hb_font_reference(nullFaceFont);
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}
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HbFontCache* fontCache = getFontCacheLocked();
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const int32_t fontId = minikinFont->GetUniqueId();
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hb_font_t* font = fontCache->get(fontId);
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if (font != nullptr) {
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return hb_font_reference(font);
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}
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hb_face_t* face;
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const void* buf = minikinFont->GetFontData();
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size_t size = minikinFont->GetFontSize();
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hb_blob_t* blob = hb_blob_create(reinterpret_cast<const char*>(buf), size,
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HB_MEMORY_MODE_READONLY, nullptr, nullptr);
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face = hb_face_create(blob, minikinFont->GetFontIndex());
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hb_blob_destroy(blob);
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hb_font_t* parent_font = hb_font_create(face);
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hb_ot_font_set_funcs(parent_font);
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unsigned int upem = hb_face_get_upem(face);
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hb_font_set_scale(parent_font, upem, upem);
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font = hb_font_create_sub_font(parent_font);
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std::vector<hb_variation_t> variations;
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for (const FontVariation& variation : minikinFont->GetAxes()) {
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variations.push_back({variation.axisTag, variation.value});
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}
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hb_font_set_variations(font, variations.data(), variations.size());
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hb_font_destroy(parent_font);
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hb_face_destroy(face);
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fontCache->put(fontId, font);
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return hb_font_reference(font);
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}
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} // namespace minikin
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