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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef MINIKIN_LAYOUT_PIECES_H
     18 #define MINIKIN_LAYOUT_PIECES_H
     19 
     20 #include <unordered_map>
     21 
     22 #include "minikin/Layout.h"
     23 #include "minikin/LayoutCache.h"
     24 
     25 namespace minikin {
     26 
     27 struct LayoutPieces {
     28     struct KeyHasher {
     29         std::size_t operator()(const LayoutCacheKey& key) const { return key.hash(); }
     30     };
     31 
     32     LayoutPieces() {}
     33 
     34     ~LayoutPieces() {
     35         for (const auto it : offsetMap) {
     36             const_cast<LayoutCacheKey*>(&it.first)->freeText();
     37         }
     38     }
     39 
     40     std::unordered_map<LayoutCacheKey, Layout, KeyHasher> offsetMap;
     41 
     42     void insert(const U16StringPiece& textBuf, const Range& range, const MinikinPaint& paint,
     43                 bool dir, StartHyphenEdit startEdit, EndHyphenEdit endEdit, const Layout& layout) {
     44         auto result = offsetMap.emplace(
     45                 std::piecewise_construct,
     46                 std::forward_as_tuple(textBuf, range, paint, dir, startEdit, endEdit),
     47                 std::forward_as_tuple(layout));
     48         if (result.second) {
     49             const_cast<LayoutCacheKey*>(&result.first->first)->copyText();
     50         }
     51     }
     52 
     53     template <typename F>
     54     void getOrCreate(const U16StringPiece& textBuf, const Range& range, const MinikinPaint& paint,
     55                      bool dir, StartHyphenEdit startEdit, EndHyphenEdit endEdit, F& f) const {
     56         auto it = offsetMap.find(LayoutCacheKey(textBuf, range, paint, dir, startEdit, endEdit));
     57         if (it == offsetMap.end()) {
     58             LayoutCache::getInstance().getOrCreate(textBuf, range, paint, dir, startEdit, endEdit,
     59                                                    f);
     60         } else {
     61             f(it->second);
     62         }
     63     }
     64 
     65     uint32_t getMemoryUsage() const {
     66         uint32_t result = 0;
     67         for (const auto& i : offsetMap) {
     68             result += i.first.getMemoryUsage() + i.second.getMemoryUsage();
     69         }
     70         return result;
     71     }
     72 };
     73 
     74 }  // namespace minikin
     75 
     76 #endif  // MINIKIN_LAYOUT_PIECES_H
     77