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9afcc6e2bd
This patch eagerly purges the corresponding hb_font_t object from the HbFontCache when the underlying MinikinFont is destroyed. After that, the key will no longer be accessed, so having the entry is wastes memory. Bug: 27251075 Bug: 27860101 Change-Id: I1b98016133fe3baf6525ac37d970a65ddccadb4f
140 lines
3.7 KiB
C++
140 lines
3.7 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 <cutils/log.h>
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#include <hb.h>
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#include <hb-ot.h>
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#include <utils/LruCache.h>
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#include <minikin/MinikinFont.h>
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#include "MinikinInternal.h"
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namespace android {
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static hb_blob_t* referenceTable(hb_face_t* /* face */, hb_tag_t tag, void* userData) {
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MinikinFont* font = reinterpret_cast<MinikinFont*>(userData);
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size_t length = 0;
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bool ok = font->GetTable(tag, NULL, &length);
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if (!ok) {
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return 0;
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}
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char* buffer = reinterpret_cast<char*>(malloc(length));
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if (!buffer) {
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return 0;
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}
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ok = font->GetTable(tag, reinterpret_cast<uint8_t*>(buffer), &length);
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#ifdef VERBOSE_DEBUG
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ALOGD("referenceTable %c%c%c%c length=%zd %d",
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(tag >>24)&0xff, (tag>>16)&0xff, (tag>>8)&0xff, tag&0xff, length, ok);
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#endif
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if (!ok) {
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free(buffer);
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return 0;
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}
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return hb_blob_create(const_cast<char*>(buffer), length,
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HB_MEMORY_MODE_WRITABLE, buffer, free);
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}
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class HbFontCache : private 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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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 purgeHbFont(const MinikinFont* minikinFont) {
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AutoMutex _l(gMinikinLock);
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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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hb_font_t* getHbFontLocked(MinikinFont* minikinFont) {
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assertMinikinLocked();
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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 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 font;
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}
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hb_face_t* face = hb_face_create_for_tables(referenceTable, minikinFont, nullptr);
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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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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 font;
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}
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} // namespace android
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