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6f9966ea7c
The motivation of this CL is enhance the font fallback score design to support multiple language font fallback. This CL contains following changes: - Break language based font score into two: script-based score and primary-language-based score. - The primary-language-based score is 0 if the script-based score is 0. If the script-based score is not 0 and the primary language is the as same as the requested one, the font gets an extra score of 1. - The language score gets a higher multiplier for languages higher in the locale list. Bug: 25122318 Bug: 26168983 Change-Id: Ib999997a88e6977e341f4c325e2a1b41a59db2d5
102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
/*
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* Copyright (C) 2013 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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#ifndef MINIKIN_FONT_COLLECTION_H
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#define MINIKIN_FONT_COLLECTION_H
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#include <vector>
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#include <minikin/MinikinRefCounted.h>
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#include <minikin/MinikinFont.h>
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#include <minikin/FontFamily.h>
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namespace android {
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class FontCollection : public MinikinRefCounted {
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public:
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explicit FontCollection(const std::vector<FontFamily*>& typefaces);
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~FontCollection();
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struct Run {
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FakedFont fakedFont;
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int start;
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int end;
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};
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void itemize(const uint16_t *string, size_t string_length, FontStyle style,
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std::vector<Run>* result) const;
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// Returns true if there is a glyph for the code point and variation selector pair.
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// Returns false if no fonts have a glyph for the code point and variation
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// selector pair, or invalid variation selector is passed.
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bool hasVariationSelector(uint32_t baseCodepoint, uint32_t variationSelector) const;
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// Get the base font for the given style, useful for font-wide metrics.
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MinikinFont* baseFont(FontStyle style);
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// Get base font with fakery information (fake bold could affect metrics)
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FakedFont baseFontFaked(FontStyle style);
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uint32_t getId() const;
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// Calls each managed font family's FontFamily::purgeHbFontCache method.
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// Caller should acquire a lock before calling the method.
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void purgeFontFamilyHbFontCache() const;
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private:
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static const int kLogCharsPerPage = 8;
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static const int kPageMask = (1 << kLogCharsPerPage) - 1;
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struct Range {
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size_t start;
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size_t end;
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};
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FontFamily* getFamilyForChar(uint32_t ch, uint32_t vs, uint32_t langListId, int variant) const;
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uint32_t calcFamilyScore(uint32_t ch, uint32_t vs, int variant, uint32_t langListId,
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FontFamily* fontFamily) const;
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uint32_t calcCoverageScore(uint32_t ch, uint32_t vs, FontFamily* fontFamily) const;
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static uint32_t calcLanguageMatchingScore(uint32_t userLangListId,
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const FontFamily& fontFamily);
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static uint32_t calcVariantMatchingScore(int variant, const FontFamily& fontFamily);
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// static for allocating unique id's
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static uint32_t sNextId;
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// unique id for this font collection (suitable for cache key)
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uint32_t mId;
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// Highest UTF-32 code point that can be mapped
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uint32_t mMaxChar;
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// This vector has ownership of the bitsets and typeface objects.
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std::vector<FontFamily*> mFamilies;
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// This vector contains pointers into mInstances
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std::vector<FontFamily*> mFamilyVec;
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// These are offsets into mInstanceVec, one range per page
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std::vector<Range> mRanges;
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};
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} // namespace android
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#endif // MINIKIN_FONT_COLLECTION_H
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