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/*
* Copyright (C) 2015 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.
*/
#define LOG_TAG "Minikin"
#include "HbFontCache.h"
#include <cutils/log.h>
#include <hb.h>
#include <hb-ot.h>
#include <utils/LruCache.h>
#include <minikin/MinikinFont.h>
#include "MinikinInternal.h"
namespace android {
static hb_blob_t* referenceTable(hb_face_t* /* face */, hb_tag_t tag, void* userData) {
MinikinFont* font = reinterpret_cast<MinikinFont*>(userData);
size_t length = 0;
bool ok = font->GetTable(tag, NULL, &length);
if (!ok) {
return 0;
}
char* buffer = reinterpret_cast<char*>(malloc(length));
if (!buffer) {
return 0;
}
ok = font->GetTable(tag, reinterpret_cast<uint8_t*>(buffer), &length);
#ifdef VERBOSE_DEBUG
ALOGD("referenceTable %c%c%c%c length=%zd %d",
(tag >>24)&0xff, (tag>>16)&0xff, (tag>>8)&0xff, tag&0xff, length, ok);
#endif
if (!ok) {
free(buffer);
return 0;
}
return hb_blob_create(const_cast<char*>(buffer), length,
HB_MEMORY_MODE_WRITABLE, buffer, free);
}
class HbFontCache : private OnEntryRemoved<int32_t, hb_font_t*> {
public:
HbFontCache() : mCache(kMaxEntries) {
mCache.setOnEntryRemovedListener(this);
}
// callback for OnEntryRemoved
void operator()(int32_t& /* key */, hb_font_t*& value) {
hb_font_destroy(value);
}
hb_font_t* get(int32_t fontId) {
return mCache.get(fontId);
}
void put(int32_t fontId, hb_font_t* font) {
mCache.put(fontId, font);
}
void clear() {
mCache.clear();
}
void remove(int32_t fontId) {
mCache.remove(fontId);
}
private:
static const size_t kMaxEntries = 100;
LruCache<int32_t, hb_font_t*> mCache;
};
HbFontCache* getFontCacheLocked() {
assertMinikinLocked();
static HbFontCache* cache = nullptr;
if (cache == nullptr) {
cache = new HbFontCache();
}
return cache;
}
void purgeHbFontCacheLocked() {
assertMinikinLocked();
getFontCacheLocked()->clear();
}
void purgeHbFont(const MinikinFont* minikinFont) {
AutoMutex _l(gMinikinLock);
const int32_t fontId = minikinFont->GetUniqueId();
getFontCacheLocked()->remove(fontId);
}
hb_font_t* getHbFontLocked(MinikinFont* minikinFont) {
assertMinikinLocked();
static hb_font_t* nullFaceFont = nullptr;
if (minikinFont == nullptr) {
if (nullFaceFont == nullptr) {
nullFaceFont = hb_font_create(nullptr);
}
return nullFaceFont;
}
HbFontCache* fontCache = getFontCacheLocked();
const int32_t fontId = minikinFont->GetUniqueId();
hb_font_t* font = fontCache->get(fontId);
if (font != nullptr) {
return font;
}
hb_face_t* face = hb_face_create_for_tables(referenceTable, minikinFont, nullptr);
hb_font_t* parent_font = hb_font_create(face);
hb_ot_font_set_funcs(parent_font);
unsigned int upem = hb_face_get_upem(face);
hb_font_set_scale(parent_font, upem, upem);
font = hb_font_create_sub_font(parent_font);
hb_font_destroy(parent_font);
hb_face_destroy(face);
fontCache->put(fontId, font);
return font;
}
} // namespace android
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