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https://github.com/flutter/flutter.git
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b80c1f19c5
All major externally accessible objects (especially FontFamily and FontCollection) are now reference counted. In addition, there is a global lock intended to make operations thread-safe. WIP notice: in this version of the patch, not all external API entry points are protected by the lock. That should be fixed. Change-Id: I14106196e99eb101e8bf1bcb4b81359759d2086c
100 lines
2.9 KiB
C++
100 lines
2.9 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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#define LOG_TAG "Minikin"
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#include <cutils/log.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <minikin/MinikinFont.h>
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#include <minikin/AnalyzeStyle.h>
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#include <minikin/FontFamily.h>
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#include <UniquePtr.h>
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using std::vector;
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namespace android {
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FontFamily::~FontFamily() {
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for (size_t i = 0; i < mFonts.size(); i++) {
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mFonts[i].typeface->UnrefLocked();
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}
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}
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bool FontFamily::addFont(MinikinFont* typeface) {
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const uint32_t os2Tag = MinikinFont::MakeTag('O', 'S', '/', '2');
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size_t os2Size = 0;
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bool ok = typeface->GetTable(os2Tag, NULL, &os2Size);
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if (!ok) return false;
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UniquePtr<uint8_t[]> os2Data(new uint8_t[os2Size]);
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ok = typeface->GetTable(os2Tag, os2Data.get(), &os2Size);
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if (!ok) return false;
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int weight;
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bool italic;
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if (analyzeStyle(os2Data.get(), os2Size, &weight, &italic)) {
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//ALOGD("analyzed weight = %d, italic = %s", weight, italic ? "true" : "false");
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FontStyle style(weight, italic);
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addFont(typeface, style);
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return true;
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} else {
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ALOGD("failed to analyze style");
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}
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return false;
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}
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void FontFamily::addFont(MinikinFont* typeface, FontStyle style) {
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typeface->RefLocked();
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mFonts.push_back(Font(typeface, style));
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}
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// Compute a matching metric between two styles - 0 is an exact match
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int computeMatch(FontStyle style1, FontStyle style2) {
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if (style1 == style2) return 0;
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int score = abs(style1.getWeight() - style2.getWeight());
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if (style1.getItalic() != style2.getItalic()) {
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score += 2;
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}
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return score;
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}
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MinikinFont* FontFamily::getClosestMatch(FontStyle style) const {
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const Font* bestFont = NULL;
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int bestMatch = 0;
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for (size_t i = 0; i < mFonts.size(); i++) {
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const Font& font = mFonts[i];
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int match = computeMatch(font.style, style);
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if (i == 0 || match < bestMatch) {
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bestFont = &font;
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bestMatch = match;
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}
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}
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return bestFont == NULL ? NULL : bestFont->typeface;
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}
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size_t FontFamily::getNumFonts() const {
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return mFonts.size();
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}
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MinikinFont* FontFamily::getFont(size_t index) const {
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return mFonts[index].typeface;
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}
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FontStyle FontFamily::getStyle(size_t index) const {
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return mFonts[index].style;
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}
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} // namespace android
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