src/fonts/SkFontMgr_indirect.cpp - platform/external/skia - Gitiles

 /*
  * 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();
 }
	/*
	* 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();
	}