/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFontMgr_indirect.h"
#include "SkDataTable.h"
#include "SkFontStyle.h"
#include "SkOnce.h"
#include "SkStream.h"
#include "SkTSearch.h"
#include "SkTypeface.h"
class SkData;
class SkString;
class SkStyleSet_Indirect : public SkFontStyleSet {
public:
/** Takes ownership of the SkRemotableFontIdentitySet. */
SkStyleSet_Indirect(const SkFontMgr_Indirect* owner, int familyIndex,
SkRemotableFontIdentitySet* data)
: fOwner(SkRef(owner)), fFamilyIndex(familyIndex), fData(data)
{ }
int count() override { return fData->count(); }
void getStyle(int index, SkFontStyle* fs, SkString* style) override {
if (fs) {
*fs = fData->at(index).fFontStyle;
}
if (style) {
// TODO: is this useful? Current locale?
style->reset();
}
}
SkTypeface* createTypeface(int index) override {
return fOwner->createTypefaceFromFontId(fData->at(index));
}
SkTypeface* matchStyle(const SkFontStyle& pattern) override {
if (fFamilyIndex >= 0) {
SkFontIdentity id = fOwner->fProxy->matchIndexStyle(fFamilyIndex, pattern);
return fOwner->createTypefaceFromFontId(id);
}
// If this SkStyleSet was created via onMatchFamily we would need a call like
// fOwner->fProxy->matchNameStyle(fFamilyName, pattern);
// but would not activate fonts (only consider fonts which would come back from matchName).
// CSS policy sounds good.
struct Score {
int score;
int index;
};
// Width has the greatest priority.
// If the value of pattern.width is 5 (normal) or less,
// narrower width values are checked first, then wider values.
// If the value of pattern.width is greater than 5 (normal),
// wider values are checked first, followed by narrower values.
// Italic/Oblique has the next highest priority.
// If italic requested and there is some italic font, use it.
// If oblique requested and there is some oblique font, use it.
// If italic requested and there is some oblique font, use it.
// If oblique requested and there is some italic font, use it.
// Exact match.
// If pattern.weight < 400, weights below pattern.weight are checked
// in descending order followed by weights above pattern.weight
// in ascending order until a match is found.
// If pattern.weight > 500, weights above pattern.weight are checked
// in ascending order followed by weights below pattern.weight
// in descending order until a match is found.
// If pattern.weight is 400, 500 is checked first
// and then the rule for pattern.weight < 400 is used.
// If pattern.weight is 500, 400 is checked first
// and then the rule for pattern.weight < 400 is used
Score maxScore = { 0, 0 };
for (int i = 0; i < fData->count(); ++i) {
const SkFontStyle& current = fData->at(i).fFontStyle;
Score currentScore = { 0, i };
// CSS stretch. (This is the width.)
// This has the highest priority.
if (pattern.width() <= SkFontStyle::kNormal_Width) {
if (current.width() <= pattern.width()) {
currentScore.score += 10 - pattern.width() + current.width();
} else {
currentScore.score += 10 - current.width();
}
} else {
if (current.width() > pattern.width()) {
currentScore.score += 10 + pattern.width() - current.width();
} else {
currentScore.score += current.width();
}
}
currentScore.score *= 1002;
// CSS style (italic/oblique)
// Being italic trumps all valid weights which are not italic.
// Note that newer specs differentiate between italic and oblique.
if (pattern.isItalic() && current.isItalic()) {
currentScore.score += 1001;
}
// Synthetics (weight/style) [no stretch synthetic?]
// The 'closer' to the target weight, the higher the score.
// 1000 is the 'heaviest' recognized weight
if (pattern.weight() == current.weight()) {
currentScore.score += 1000;
} else if (pattern.weight() <= 500) {
if (pattern.weight() >= 400 && pattern.weight() < 450) {
if (current.weight() >= 450 && current.weight() <= 500) {
// Artificially boost the 500 weight.
// TODO: determine correct number to use.
currentScore.score += 500;
}
}
if (current.weight() <= pattern.weight()) {
currentScore.score += 1000 - pattern.weight() + current.weight();
} else {
currentScore.score += 1000 - current.weight();
}
} else if (pattern.weight() > 500) {
if (current.weight() > pattern.weight()) {
currentScore.score += 1000 + pattern.weight() - current.weight();
} else {
currentScore.score += current.weight();
}
}
if (currentScore.score > maxScore.score) {
maxScore = currentScore;
}
}
return this->createTypeface(maxScore.index);
}
private:
SkAutoTUnref<const SkFontMgr_Indirect> fOwner;
int fFamilyIndex;
SkAutoTUnref<SkRemotableFontIdentitySet> fData;
};
void SkFontMgr_Indirect::set_up_family_names(const SkFontMgr_Indirect* self) {
self->fFamilyNames.reset(self->fProxy->getFamilyNames());
}
int SkFontMgr_Indirect::onCountFamilies() const {
SkOnce(&fFamilyNamesInited, &fFamilyNamesMutex, SkFontMgr_Indirect::set_up_family_names, this);
return fFamilyNames->count();
}
void SkFontMgr_Indirect::onGetFamilyName(int index, SkString* familyName) const {
SkOnce(&fFamilyNamesInited, &fFamilyNamesMutex, SkFontMgr_Indirect::set_up_family_names, this);
if (index >= fFamilyNames->count()) {
familyName->reset();
return;
}
familyName->set(fFamilyNames->atStr(index));
}
SkFontStyleSet* SkFontMgr_Indirect::onCreateStyleSet(int index) const {
SkRemotableFontIdentitySet* set = fProxy->getIndex(index);
if (NULL == set) {
return NULL;
}
return SkNEW_ARGS(SkStyleSet_Indirect, (this, index, set));
}
SkFontStyleSet* SkFontMgr_Indirect::onMatchFamily(const char familyName[]) const {
return SkNEW_ARGS(SkStyleSet_Indirect, (this, -1, fProxy->matchName(familyName)));
}
SkTypeface* SkFontMgr_Indirect::createTypefaceFromFontId(const SkFontIdentity& id) const {
if (id.fDataId == SkFontIdentity::kInvalidDataId) {
return NULL;
}
SkAutoMutexAcquire ama(fDataCacheMutex);
SkAutoTUnref<SkTypeface> dataTypeface;
int dataTypefaceIndex = 0;
for (int i = 0; i < fDataCache.count(); ++i) {
const DataEntry& entry = fDataCache[i];
if (entry.fDataId == id.fDataId) {
if (entry.fTtcIndex == id.fTtcIndex &&
!entry.fTypeface->weak_expired() && entry.fTypeface->try_ref())
{
return entry.fTypeface;
}
if (dataTypeface.get() == NULL &&
!entry.fTypeface->weak_expired() && entry.fTypeface->try_ref())
{
dataTypeface.reset(entry.fTypeface);
dataTypefaceIndex = entry.fTtcIndex;
}
}
if (entry.fTypeface->weak_expired()) {
fDataCache.removeShuffle(i);
--i;
}
}
// No exact match, but did find a data match.
if (dataTypeface.get() != NULL) {
SkAutoTDelete<SkStreamAsset> stream(dataTypeface->openStream(NULL));
if (stream.get() != NULL) {
return fImpl->createFromStream(stream.detach(), dataTypefaceIndex);
}
}
// No data match, request data and add entry.
SkAutoTDelete<SkStreamAsset> stream(fProxy->getData(id.fDataId));
if (stream.get() == NULL) {
return NULL;
}
SkAutoTUnref<SkTypeface> typeface(fImpl->createFromStream(stream.detach(), id.fTtcIndex));
if (typeface.get() == NULL) {
return NULL;
}
DataEntry& newEntry = fDataCache.push_back();
typeface->weak_ref();
newEntry.fDataId = id.fDataId;
newEntry.fTtcIndex = id.fTtcIndex;
newEntry.fTypeface = typeface.get(); // weak reference passed to new entry.
return typeface.detach();
}
SkTypeface* SkFontMgr_Indirect::onMatchFamilyStyle(const char familyName[],
const SkFontStyle& fontStyle) const {
SkFontIdentity id = fProxy->matchNameStyle(familyName, fontStyle);
return this->createTypefaceFromFontId(id);
}
SkTypeface* SkFontMgr_Indirect::onMatchFamilyStyleCharacter(const char familyName[],
const SkFontStyle& style,
const char* bcp47[],
int bcp47Count,
SkUnichar character) const {
SkFontIdentity id = fProxy->matchNameStyleCharacter(familyName, style, bcp47,
bcp47Count, character);
return this->createTypefaceFromFontId(id);
}
SkTypeface* SkFontMgr_Indirect::onMatchFaceStyle(const SkTypeface* familyMember,
const SkFontStyle& fontStyle) const {
SkString familyName;
familyMember->getFamilyName(&familyName);
return this->matchFamilyStyle(familyName.c_str(), fontStyle);
}
SkTypeface* SkFontMgr_Indirect::onCreateFromStream(SkStreamAsset* stream, int ttcIndex) const {
return fImpl->createFromStream(stream, ttcIndex);
}
SkTypeface* SkFontMgr_Indirect::onCreateFromFile(const char path[], int ttcIndex) const {
return fImpl->createFromFile(path, ttcIndex);
}
SkTypeface* SkFontMgr_Indirect::onCreateFromData(SkData* data, int ttcIndex) const {
return fImpl->createFromData(data, ttcIndex);
}
SkTypeface* SkFontMgr_Indirect::onLegacyCreateTypeface(const char familyName[],
unsigned styleBits) const {
bool bold = SkToBool(styleBits & SkTypeface::kBold);
bool italic = SkToBool(styleBits & SkTypeface::kItalic);
SkFontStyle style = SkFontStyle(bold ? SkFontStyle::kBold_Weight
: SkFontStyle::kNormal_Weight,
SkFontStyle::kNormal_Width,
italic ? SkFontStyle::kItalic_Slant
: SkFontStyle::kUpright_Slant);
SkAutoTUnref<SkTypeface> face(this->matchFamilyStyle(familyName, style));
if (NULL == face.get()) {
face.reset(this->matchFamilyStyle(NULL, style));
}
if (NULL == face.get()) {
SkFontIdentity fontId = this->fProxy->matchIndexStyle(0, style);
face.reset(this->createTypefaceFromFontId(fontId));
}
return face.detach();
}