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      1 /*
      2  * Copyright (C) 2013 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_FONT_COLLECTION_H
     18 #define MINIKIN_FONT_COLLECTION_H
     19 
     20 #include <vector>
     21 
     22 #include <minikin/MinikinRefCounted.h>
     23 #include <minikin/MinikinFont.h>
     24 #include <minikin/FontFamily.h>
     25 
     26 namespace android {
     27 
     28 class FontCollection : public MinikinRefCounted {
     29 public:
     30     explicit FontCollection(const std::vector<FontFamily*>& typefaces);
     31 
     32     ~FontCollection();
     33 
     34     struct Run {
     35         FakedFont fakedFont;
     36         int start;
     37         int end;
     38     };
     39 
     40     void itemize(const uint16_t *string, size_t string_length, FontStyle style,
     41             std::vector<Run>* result) const;
     42 
     43     // Get the base font for the given style, useful for font-wide metrics.
     44     MinikinFont* baseFont(FontStyle style);
     45 
     46     // Get base font with fakery information (fake bold could affect metrics)
     47     FakedFont baseFontFaked(FontStyle style);
     48 
     49     uint32_t getId() const;
     50 private:
     51     static const int kLogCharsPerPage = 8;
     52     static const int kPageMask = (1 << kLogCharsPerPage) - 1;
     53 
     54     struct Range {
     55         size_t start;
     56         size_t end;
     57     };
     58 
     59     FontFamily* getFamilyForChar(uint32_t ch, FontLanguage lang, int variant) const;
     60 
     61     // static for allocating unique id's
     62     static uint32_t sNextId;
     63 
     64     // unique id for this font collection (suitable for cache key)
     65     uint32_t mId;
     66 
     67     // Highest UTF-32 code point that can be mapped
     68     uint32_t mMaxChar;
     69 
     70     // This vector has ownership of the bitsets and typeface objects.
     71     std::vector<FontFamily*> mFamilies;
     72 
     73     // This vector contains pointers into mInstances
     74     std::vector<FontFamily*> mFamilyVec;
     75 
     76     // These are offsets into mInstanceVec, one range per page
     77     std::vector<Range> mRanges;
     78 };
     79 
     80 }  // namespace android
     81 
     82 #endif  // MINIKIN_FONT_COLLECTION_H
     83