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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFontDescriptor.h"
#include "SkFontMgr.h"
#include "SkOncePtr.h"
#include "SkStream.h"
#include "SkTypes.h"
class SkFontStyle;
class SkTypeface;
class SkEmptyFontStyleSet : public SkFontStyleSet {
public:
int count() override { return 0; }
void getStyle(int, SkFontStyle*, SkString*) override {
SkDEBUGFAIL("SkFontStyleSet::getStyle called on empty set");
}
SkTypeface* createTypeface(int index) override {
SkDEBUGFAIL("SkFontStyleSet::createTypeface called on empty set");
return nullptr;
}
SkTypeface* matchStyle(const SkFontStyle&) override {
return nullptr;
}
};
SkFontStyleSet* SkFontStyleSet::CreateEmpty() { return new SkEmptyFontStyleSet; }
///////////////////////////////////////////////////////////////////////////////
class SkEmptyFontMgr : public SkFontMgr {
protected:
int onCountFamilies() const override {
return 0;
}
void onGetFamilyName(int index, SkString* familyName) const override {
SkDEBUGFAIL("onGetFamilyName called with bad index");
}
SkFontStyleSet* onCreateStyleSet(int index) const override {
SkDEBUGFAIL("onCreateStyleSet called with bad index");
return nullptr;
}
SkFontStyleSet* onMatchFamily(const char[]) const override {
return SkFontStyleSet::CreateEmpty();
}
virtual SkTypeface* onMatchFamilyStyle(const char[],
const SkFontStyle&) const override {
return nullptr;
}
virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
const SkFontStyle& style,
const char* bcp47[],
int bcp47Count,
SkUnichar character) const override {
return nullptr;
}
virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
const SkFontStyle&) const override {
return nullptr;
}
SkTypeface* onCreateFromData(SkData*, int) const override {
return nullptr;
}
SkTypeface* onCreateFromStream(SkStreamAsset* stream, int) const override {
delete stream;
return nullptr;
}
SkTypeface* onCreateFromFile(const char[], int) const override {
return nullptr;
}
SkTypeface* onLegacyCreateTypeface(const char [], unsigned) const override {
return nullptr;
}
};
static SkFontStyleSet* emptyOnNull(SkFontStyleSet* fsset) {
if (nullptr == fsset) {
fsset = SkFontStyleSet::CreateEmpty();
}
return fsset;
}
int SkFontMgr::countFamilies() const {
return this->onCountFamilies();
}
void SkFontMgr::getFamilyName(int index, SkString* familyName) const {
this->onGetFamilyName(index, familyName);
}
SkFontStyleSet* SkFontMgr::createStyleSet(int index) const {
return emptyOnNull(this->onCreateStyleSet(index));
}
SkFontStyleSet* SkFontMgr::matchFamily(const char familyName[]) const {
return emptyOnNull(this->onMatchFamily(familyName));
}
SkTypeface* SkFontMgr::matchFamilyStyle(const char familyName[],
const SkFontStyle& fs) const {
return this->onMatchFamilyStyle(familyName, fs);
}
SkTypeface* SkFontMgr::matchFamilyStyleCharacter(const char familyName[], const SkFontStyle& style,
const char* bcp47[], int bcp47Count,
SkUnichar character) const {
return this->onMatchFamilyStyleCharacter(familyName, style, bcp47, bcp47Count, character);
}
SkTypeface* SkFontMgr::matchFaceStyle(const SkTypeface* face,
const SkFontStyle& fs) const {
return this->onMatchFaceStyle(face, fs);
}
SkTypeface* SkFontMgr::createFromData(SkData* data, int ttcIndex) const {
if (nullptr == data) {
return nullptr;
}
return this->onCreateFromData(data, ttcIndex);
}
SkTypeface* SkFontMgr::createFromStream(SkStreamAsset* stream, int ttcIndex) const {
if (nullptr == stream) {
return nullptr;
}
return this->onCreateFromStream(stream, ttcIndex);
}
SkTypeface* SkFontMgr::createFromFontData(SkFontData* data) const {
if (nullptr == data) {
return nullptr;
}
return this->onCreateFromFontData(data);
}
// This implementation is temporary until it can be made pure virtual.
SkTypeface* SkFontMgr::onCreateFromFontData(SkFontData* data) const {
SkTypeface* ret = this->createFromStream(data->detachStream(), data->getIndex());
delete data;
return ret;
}
SkTypeface* SkFontMgr::createFromFile(const char path[], int ttcIndex) const {
if (nullptr == path) {
return nullptr;
}
return this->onCreateFromFile(path, ttcIndex);
}
SkTypeface* SkFontMgr::legacyCreateTypeface(const char familyName[],
unsigned styleBits) const {
return this->onLegacyCreateTypeface(familyName, styleBits);
}
SK_DECLARE_STATIC_ONCE_PTR(SkFontMgr, singleton);
SkFontMgr* SkFontMgr::RefDefault() {
return SkRef(singleton.get([]{
SkFontMgr* fm = SkFontMgr::Factory();
return fm ? fm : new SkEmptyFontMgr;
}));
}
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