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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 "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 {
// Parse bcp-47 language identifier into internal structure
FontLanguage::FontLanguage(const char* buf, size_t size) {
uint32_t bits = 0;
size_t i;
for (i = 0; i < size; i++) {
uint16_t c = buf[i];
if (c == '-' || c == '_') break;
}
if (i == 2) {
bits = (uint8_t(buf[0]) << 8) | uint8_t(buf[1]);
}
size_t next;
for (i++; i < size; i = next + 1) {
for (next = i; next < size; next++) {
uint16_t c = buf[next];
if (c == '-' || c == '_') break;
}
if (next - i == 4 && buf[i] == 'H' && buf[i+1] == 'a' && buf[i+2] == 'n') {
if (buf[i+3] == 's') {
bits |= kHansFlag;
} else if (buf[i+3] == 't') {
bits |= kHantFlag;
}
}
// TODO: this might be a good place to infer script from country (zh_TW -> Hant),
// but perhaps it's up to the client to do that, before passing a string.
}
mBits = bits;
}
std::string FontLanguage::getString() const {
char buf[16];
size_t i = 0;
if (mBits & kBaseLangMask) {
buf[i++] = (mBits >> 8) & 0xFFu;
buf[i++] = mBits & 0xFFu;
}
if (mBits & kScriptMask) {
if (!i)
buf[i++] = 'x';
buf[i++] = '-';
buf[i++] = 'H';
buf[i++] = 'a';
buf[i++] = 'n';
if (mBits & kHansFlag)
buf[i++] = 's';
else
buf[i++] = 't';
}
return std::string(buf, i);
}
int FontLanguage::match(const FontLanguage other) const {
int result = 0;
if ((mBits & kBaseLangMask) == (other.mBits & kBaseLangMask)) {
result++;
if ((mBits & kScriptMask) != 0 && (mBits & kScriptMask) == (other.mBits & kScriptMask)) {
result++;
}
}
return result;
}
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');
size_t os2Size = 0;
bool ok = typeface->GetTable(os2Tag, NULL, &os2Size);
if (!ok) return false;
UniquePtr<uint8_t[]> os2Data(new uint8_t[os2Size]);
ok = typeface->GetTable(os2Tag, os2Data.get(), &os2Size);
if (!ok) return false;
int weight;
bool italic;
if (analyzeStyle(os2Data.get(), os2Size, &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;
}
const SparseBitSet* FontFamily::getCoverage() {
if (!mCoverageValid) {
const FontStyle defaultStyle;
MinikinFont* typeface = getClosestMatch(defaultStyle).font;
const uint32_t cmapTag = MinikinFont::MakeTag('c', 'm', 'a', 'p');
size_t cmapSize = 0;
if (!typeface->GetTable(cmapTag, NULL, &cmapSize)) {
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;
}
UniquePtr<uint8_t[]> cmapData(new uint8_t[cmapSize]);
if (!typeface->GetTable(cmapTag, cmapData.get(), &cmapSize)) {
ALOGE("Unexpected failure to read cmap table!\n");
return nullptr;
}
CmapCoverage::getCoverage(mCoverage, cmapData.get(), cmapSize); // TODO: Error check?
#ifdef VERBOSE_DEBUG
ALOGD("font coverage length=%d, first ch=%x\n", mCoverage->length(),
mCoverage->nextSetBit(0));
#endif
mCoverageValid = true;
}
return &mCoverage;
}
} // namespace android
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