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/*
* Copyright (C) 2013 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 <cutils/log.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <hb.h>
#include <hb-ot.h>
#include <utils/JenkinsHash.h>
#include "FontLanguage.h"
#include "FontLanguageListCache.h"
#include "HbFontCache.h"
#include "MinikinInternal.h"
#include <minikin/MinikinFont.h>
#include <minikin/AnalyzeStyle.h>
#include <minikin/CmapCoverage.h>
#include <minikin/FontFamily.h>
#include <UniquePtr.h>
using std::vector;
namespace android {
FontStyle::FontStyle(int variant, int weight, bool italic)
: FontStyle(FontLanguageListCache::kEmptyListId, variant, weight, italic) {
}
FontStyle::FontStyle(uint32_t languageListId, int variant, int weight, bool italic)
: bits(pack(variant, weight, italic)), mLanguageListId(languageListId) {
}
hash_t FontStyle::hash() const {
uint32_t hash = JenkinsHashMix(0, bits);
hash = JenkinsHashMix(hash, mLanguageListId);
return JenkinsHashWhiten(hash);
}
// static
uint32_t FontStyle::registerLanguageList(const std::string& languages) {
AutoMutex _l(gMinikinLock);
return FontLanguageListCache::getId(languages);
}
// static
uint32_t FontStyle::pack(int variant, int weight, bool italic) {
return (weight & kWeightMask) | (italic ? kItalicMask : 0) | (variant << kVariantShift);
}
FontFamily::FontFamily() : FontFamily(0 /* variant */) {
}
FontFamily::FontFamily(int variant) : FontFamily(FontLanguageListCache::kEmptyListId, variant) {
}
FontFamily::~FontFamily() {
for (size_t i = 0; i < mFonts.size(); i++) {
mFonts[i].typeface->UnrefLocked();
}
}
bool FontFamily::addFont(MinikinFont* typeface) {
AutoMutex _l(gMinikinLock);
const uint32_t os2Tag = MinikinFont::MakeTag('O', 'S', '/', '2');
HbBlob os2Table(getFontTable(typeface, os2Tag));
if (os2Table.get() == nullptr) return false;
int weight;
bool italic;
if (analyzeStyle(os2Table.get(), os2Table.size(), &weight, &italic)) {
//ALOGD("analyzed weight = %d, italic = %s", weight, italic ? "true" : "false");
FontStyle style(weight, italic);
addFontLocked(typeface, style);
return true;
} else {
ALOGD("failed to analyze style");
}
return false;
}
void FontFamily::addFont(MinikinFont* typeface, FontStyle style) {
AutoMutex _l(gMinikinLock);
addFontLocked(typeface, style);
}
void FontFamily::addFontLocked(MinikinFont* typeface, FontStyle style) {
typeface->RefLocked();
mFonts.push_back(Font(typeface, style));
mCoverageValid = false;
}
// Compute a matching metric between two styles - 0 is an exact match
static int computeMatch(FontStyle style1, FontStyle style2) {
if (style1 == style2) return 0;
int score = abs(style1.getWeight() - style2.getWeight());
if (style1.getItalic() != style2.getItalic()) {
score += 2;
}
return score;
}
static FontFakery computeFakery(FontStyle wanted, FontStyle actual) {
// If desired weight is semibold or darker, and 2 or more grades
// higher than actual (for example, medium 500 -> bold 700), then
// select fake bold.
int wantedWeight = wanted.getWeight();
bool isFakeBold = wantedWeight >= 6 && (wantedWeight - actual.getWeight()) >= 2;
bool isFakeItalic = wanted.getItalic() && !actual.getItalic();
return FontFakery(isFakeBold, isFakeItalic);
}
FakedFont FontFamily::getClosestMatch(FontStyle style) const {
const Font* bestFont = NULL;
int bestMatch = 0;
for (size_t i = 0; i < mFonts.size(); i++) {
const Font& font = mFonts[i];
int match = computeMatch(font.style, style);
if (i == 0 || match < bestMatch) {
bestFont = &font;
bestMatch = match;
}
}
FakedFont result;
if (bestFont == NULL) {
result.font = NULL;
} else {
result.font = bestFont->typeface;
result.fakery = computeFakery(style, bestFont->style);
}
return result;
}
size_t FontFamily::getNumFonts() const {
return mFonts.size();
}
MinikinFont* FontFamily::getFont(size_t index) const {
return mFonts[index].typeface;
}
FontStyle FontFamily::getStyle(size_t index) const {
return mFonts[index].style;
}
bool FontFamily::isColorEmojiFamily() const {
const FontLanguages& languageList = FontLanguageListCache::getById(mLangId);
for (size_t i = 0; i < languageList.size(); ++i) {
if (languageList[i].hasEmojiFlag()) {
return true;
}
}
return false;
}
const SparseBitSet* FontFamily::getCoverage() {
if (!mCoverageValid) {
const FontStyle defaultStyle;
MinikinFont* typeface = getClosestMatch(defaultStyle).font;
const uint32_t cmapTag = MinikinFont::MakeTag('c', 'm', 'a', 'p');
HbBlob cmapTable(getFontTable(typeface, cmapTag));
if (cmapTable.get() == nullptr) {
ALOGE("Could not get cmap table size!\n");
// Note: This means we will retry on the next call to getCoverage, as we can't store
// the failure. This is fine, as we assume this doesn't really happen in practice.
return nullptr;
}
// TODO: Error check?
CmapCoverage::getCoverage(mCoverage, cmapTable.get(), cmapTable.size(), &mHasVSTable);
#ifdef VERBOSE_DEBUG
ALOGD("font coverage length=%d, first ch=%x\n", mCoverage.length(),
mCoverage.nextSetBit(0));
#endif
mCoverageValid = true;
}
return &mCoverage;
}
bool FontFamily::hasGlyph(uint32_t codepoint, uint32_t variationSelector) {
assertMinikinLocked();
if (variationSelector != 0 && !mHasVSTable) {
// Early exit if the variation selector is specified but the font doesn't have a cmap format
// 14 subtable.
return false;
}
const FontStyle defaultStyle;
MinikinFont* minikinFont = getClosestMatch(defaultStyle).font;
hb_font_t* font = getHbFontLocked(minikinFont);
uint32_t unusedGlyph;
bool result = hb_font_get_glyph(font, codepoint, variationSelector, &unusedGlyph);
hb_font_destroy(font);
return result;
}
bool FontFamily::hasVSTable() const {
LOG_ALWAYS_FATAL_IF(!mCoverageValid, "Do not call this method before getCoverage() call");
return mHasVSTable;
}
} // namespace android
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