src/ports/SkFontHost_linux.cpp - skia - Git at Google

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkFontHost.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkFontDescriptor.h"
 #include "SkFontMgr.h"
 #include "SkDescriptor.h"
 #include "SkOSFile.h"
 #include "SkPaint.h"
 #include "SkString.h"
 #include "SkStream.h"
 #include "SkThread.h"
 #include "SkTSearch.h"
 #include "SkTypefaceCache.h"
 #include "SkTArray.h"

 #include <limits>

 #ifndef SK_FONT_FILE_PREFIX
 #    define SK_FONT_FILE_PREFIX "/usr/share/fonts/truetype/"
 #endif

 ///////////////////////////////////////////////////////////////////////////////

 /** The base SkTypeface implementation for the custom font manager. */
 class SkTypeface_Custom : public SkTypeface_FreeType {
 public:
     SkTypeface_Custom(Style style, bool isFixedPitch, bool sysFont, const SkString familyName)
         : INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch)
         , fIsSysFont(sysFont), fFamilyName(familyName)
     { }

     bool isSysFont() const { return fIsSysFont; }

     virtual const char* getUniqueString() const = 0;

 protected:
     virtual void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const SK_OVERRIDE {
         desc->setFamilyName(fFamilyName.c_str());
         desc->setFontFileName(this->getUniqueString());
         *isLocal = !this->isSysFont();
     }

 private:
     bool fIsSysFont;
     SkString fFamilyName;

     typedef SkTypeface_FreeType INHERITED;
 };

 /** The empty SkTypeface implementation for the custom font manager.
  *  Used as the last resort fallback typeface.
  */
 class SkTypeface_Empty : public SkTypeface_Custom {
 public:
     SkTypeface_Empty() : INHERITED(SkTypeface::kNormal, false, true, SkString()) {}

     virtual const char* getUniqueString() const SK_OVERRIDE { return NULL; }

 protected:
     virtual SkStream* onOpenStream(int*) const SK_OVERRIDE { return NULL; }

 private:
     typedef SkTypeface_Custom INHERITED;
 };

 /** The stream SkTypeface implementation for the custom font manager. */
 class SkTypeface_Stream : public SkTypeface_Custom {
 public:
     SkTypeface_Stream(Style style, bool isFixedPitch, bool sysFont, const SkString familyName,
                       SkStream* stream, int ttcIndex)
         : INHERITED(style, isFixedPitch, sysFont, familyName)
         , fStream(SkRef(stream)), fTtcIndex(ttcIndex)
     { }

     virtual const char* getUniqueString() const SK_OVERRIDE { return NULL; }

 protected:
     virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
         *ttcIndex = 0;
         return fStream->duplicate();
     }

 private:
     SkAutoTUnref<SkStream> fStream;
     int fTtcIndex;

     typedef SkTypeface_Custom INHERITED;
 };

 /** The file SkTypeface implementation for the custom font manager. */
 class SkTypeface_File : public SkTypeface_Custom {
 public:
     SkTypeface_File(Style style, bool isFixedPitch, bool sysFont, const SkString familyName,
                     const char path[])
         : INHERITED(style, isFixedPitch, sysFont, familyName)
         , fPath(path)
     { }

     virtual const char* getUniqueString() const SK_OVERRIDE {
         const char* str = strrchr(fPath.c_str(), '/');
         if (str) {
             str += 1;   // skip the '/'
         }
         return str;
     }

 protected:
     virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
         *ttcIndex = 0;
         return SkStream::NewFromFile(fPath.c_str());
     }

 private:
     SkString fPath;

     typedef SkTypeface_Custom INHERITED;
 };

 ///////////////////////////////////////////////////////////////////////////////

 /**
  *  SkFontStyleSet_Custom
  *
  *  This class is used by SkFontMgr_Custom to hold SkTypeface_Custom families.
  */
 class SkFontStyleSet_Custom : public SkFontStyleSet {
 public:
     explicit SkFontStyleSet_Custom(const SkString familyName) : fFamilyName(familyName) { }

     virtual int count() SK_OVERRIDE {
         return fStyles.count();
     }

     virtual void getStyle(int index, SkFontStyle* style, SkString* name) SK_OVERRIDE {
         SkASSERT(index < fStyles.count());
         bool bold = fStyles[index]->isBold();
         bool italic = fStyles[index]->isItalic();
         *style = SkFontStyle(bold ? SkFontStyle::kBold_Weight : SkFontStyle::kNormal_Weight,
                              SkFontStyle::kNormal_Width,
                              italic ? SkFontStyle::kItalic_Slant : SkFontStyle::kUpright_Slant);
         name->reset();
     }

     virtual SkTypeface* createTypeface(int index) SK_OVERRIDE {
         SkASSERT(index < fStyles.count());
         return SkRef(fStyles[index].get());
     }

     static int match_score(const SkFontStyle& pattern, const SkFontStyle& candidate) {
         int score = 0;
         score += (pattern.width() - candidate.width()) * 100;
         score += (pattern.isItalic() == candidate.isItalic()) ? 0 : 1000;
         score += pattern.weight() - candidate.weight();
         return score;
     }

     virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE {
         if (0 == fStyles.count()) {
             return NULL;
         }

         SkTypeface_Custom* closest = fStyles[0];
         int minScore = std::numeric_limits<int>::max();
         for (int i = 0; i < fStyles.count(); ++i) {
             bool bold = fStyles[i]->isBold();
             bool italic = fStyles[i]->isItalic();
             SkFontStyle style = SkFontStyle(bold ? SkFontStyle::kBold_Weight
                                                  : SkFontStyle::kNormal_Weight,
                                             SkFontStyle::kNormal_Width,
                                             italic ? SkFontStyle::kItalic_Slant
                                                    : SkFontStyle::kUpright_Slant);

             int score = match_score(pattern, style);
             if (score < minScore) {
                 closest = fStyles[i];
                 minScore = score;
             }
         }
         return SkRef(closest);
     }

 private:
     SkTArray<SkAutoTUnref<SkTypeface_Custom>, true> fStyles;
     SkString fFamilyName;

     void appendTypeface(SkTypeface_Custom* typeface) {
         fStyles.push_back().reset(typeface);
     }

     friend class SkFontMgr_Custom;
 };

 /**
  *  SkFontMgr_Custom
  *
  *  This class is essentially a collection of SkFontStyleSet_Custom,
  *  one SkFontStyleSet_Custom for each family. This class may be modified
  *  to load fonts from any source by changing the initialization.
  */
 class SkFontMgr_Custom : public SkFontMgr {
 public:
     explicit SkFontMgr_Custom(const char* dir) {
         this->load_system_fonts(dir);
     }

 protected:
     virtual int onCountFamilies() const SK_OVERRIDE {
         return fFamilies.count();
     }

     virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE {
         SkASSERT(index < fFamilies.count());
         familyName->set(fFamilies[index]->fFamilyName);
     }

     virtual SkFontStyleSet_Custom* onCreateStyleSet(int index) const SK_OVERRIDE {
         SkASSERT(index < fFamilies.count());
         return SkRef(fFamilies[index].get());
     }

     virtual SkFontStyleSet_Custom* onMatchFamily(const char familyName[]) const SK_OVERRIDE {
         for (int i = 0; i < fFamilies.count(); ++i) {
             if (fFamilies[i]->fFamilyName.equals(familyName)) {
                 return SkRef(fFamilies[i].get());
             }
         }
         return NULL;
     }

     virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
                                            const SkFontStyle& fontStyle) const SK_OVERRIDE
     {
         SkAutoTUnref<SkFontStyleSet> sset(this->matchFamily(familyName));
         return sset->matchStyle(fontStyle);
     }

     virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
                                          const SkFontStyle& fontStyle) const SK_OVERRIDE
     {
         for (int i = 0; i < fFamilies.count(); ++i) {
             for (int j = 0; j < fFamilies[i]->fStyles.count(); ++j) {
                 if (fFamilies[i]->fStyles[j] == familyMember) {
                     return fFamilies[i]->matchStyle(fontStyle);
                 }
             }
         }
         return NULL;
     }

     virtual SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const SK_OVERRIDE {
         SkAutoTUnref<SkStream> stream(new SkMemoryStream(data));
         return this->createFromStream(stream, ttcIndex);
     }

     virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) const SK_OVERRIDE {
         if (NULL == stream || stream->getLength() <= 0) {
             SkDELETE(stream);
             return NULL;
         }

         bool isFixedPitch;
         SkTypeface::Style style;
         SkString name;
         if (SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
             return SkNEW_ARGS(SkTypeface_Stream, (style, isFixedPitch, false, name,
                                                   stream, ttcIndex));
         } else {
             return NULL;
         }
     }

     virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const SK_OVERRIDE {
         SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
         return stream.get() ? this->createFromStream(stream, ttcIndex) : NULL;
     }

     virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
                                                unsigned styleBits) const SK_OVERRIDE
     {
         SkTypeface::Style oldStyle = (SkTypeface::Style)styleBits;
         SkFontStyle style = SkFontStyle(oldStyle & SkTypeface::kBold
                                                  ? SkFontStyle::kBold_Weight
                                                  : SkFontStyle::kNormal_Weight,
                                         SkFontStyle::kNormal_Width,
                                         oldStyle & SkTypeface::kItalic
                                                  ? SkFontStyle::kItalic_Slant
                                                  : SkFontStyle::kUpright_Slant);
         SkTypeface* tf = NULL;

         if (NULL != familyName) {
             tf = this->onMatchFamilyStyle(familyName, style);
         }

         if (NULL == tf) {
             tf = gDefaultFamily->matchStyle(style);
         }

         return SkSafeRef(tf);
     }

 private:

     static bool get_name_and_style(const char path[], SkString* name,
                                    SkTypeface::Style* style, bool* isFixedPitch) {
         SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
         if (stream.get()) {
             return SkTypeface_FreeType::ScanFont(stream, 0, name, style, isFixedPitch);
         } else {
             SkDebugf("---- failed to open <%s> as a font\n", path);
             return false;
         }
     }

     void load_directory_fonts(const SkString& directory) {
         SkOSFile::Iter iter(directory.c_str(), ".ttf");
         SkString name;

         while (iter.next(&name, false)) {
             SkString filename(
                 SkOSPath::Join(directory.c_str(), name.c_str()));

             bool isFixedPitch;
             SkString realname;
             SkTypeface::Style style = SkTypeface::kNormal; // avoid uninitialized warning

             if (!get_name_and_style(filename.c_str(), &realname, &style, &isFixedPitch)) {
                 SkDebugf("------ can't load <%s> as a font\n", filename.c_str());
                 continue;
             }

             SkTypeface_Custom* tf = SkNEW_ARGS(SkTypeface_File, (
                                                 style,
                                                 isFixedPitch,
                                                 true,  // system-font (cannot delete)
                                                 realname,
                                                 filename.c_str()));

             SkFontStyleSet_Custom* addTo = this->onMatchFamily(realname.c_str());
             if (NULL == addTo) {
                 addTo = new SkFontStyleSet_Custom(realname);
                 fFamilies.push_back().reset(addTo);
             }
             addTo->appendTypeface(tf);
         }

         SkOSFile::Iter dirIter(directory.c_str());
         while (dirIter.next(&name, true)) {
             if (name.startsWith(".")) {
                 continue;
             }
             SkString dirname(SkOSPath::Join(directory.c_str(), name.c_str()));
             load_directory_fonts(dirname);
         }
     }

     void load_system_fonts(const char* dir) {
         SkString baseDirectory(dir);
         load_directory_fonts(baseDirectory);

         if (fFamilies.empty()) {
             SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
             fFamilies.push_back().reset(family);
             family->appendTypeface(SkNEW(SkTypeface_Empty));
         }

         // Try to pick a default font.
         static const char* gDefaultNames[] = {
             "Arial", "Verdana", "Times New Roman", "Droid Sans", NULL
         };
         for (size_t i = 0; i < SK_ARRAY_COUNT(gDefaultNames); ++i) {
             SkFontStyleSet_Custom* set = this->onMatchFamily(gDefaultNames[i]);
             if (NULL == set) {
                 continue;
             }

             SkTypeface* tf = set->matchStyle(SkFontStyle(SkFontStyle::kNormal_Weight,
                                                          SkFontStyle::kNormal_Width,
                                                          SkFontStyle::kUpright_Slant));
             if (NULL == tf) {
                 continue;
             }

             gDefaultFamily = set;
             gDefaultNormal = tf;
             break;
         }
         if (NULL == gDefaultNormal) {
             gDefaultFamily = fFamilies[0];
             gDefaultNormal = gDefaultFamily->fStyles[0];
         }
     }

     SkTArray<SkAutoTUnref<SkFontStyleSet_Custom>, true> fFamilies;
     SkFontStyleSet_Custom* gDefaultFamily;
     SkTypeface* gDefaultNormal;
 };

 SkFontMgr* SkFontMgr::Factory() {
     return new SkFontMgr_Custom(SK_FONT_FILE_PREFIX);
 }
	/*
	* Copyright 2006 The Android Open Source Project
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkFontHost.h"
	#include "SkFontHost_FreeType_common.h"
	#include "SkFontDescriptor.h"
	#include "SkFontMgr.h"
	#include "SkDescriptor.h"
	#include "SkOSFile.h"
	#include "SkPaint.h"
	#include "SkString.h"
	#include "SkStream.h"
	#include "SkThread.h"
	#include "SkTSearch.h"
	#include "SkTypefaceCache.h"
	#include "SkTArray.h"

	#include <limits>

	#ifndef SK_FONT_FILE_PREFIX
	# define SK_FONT_FILE_PREFIX "/usr/share/fonts/truetype/"
	#endif

	///////////////////////////////////////////////////////////////////////////////

	/** The base SkTypeface implementation for the custom font manager. */
	class SkTypeface_Custom : public SkTypeface_FreeType {
	public:
	SkTypeface_Custom(Style style, bool isFixedPitch, bool sysFont, const SkString familyName)
	: INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch)
	, fIsSysFont(sysFont), fFamilyName(familyName)
	{ }

	bool isSysFont() const { return fIsSysFont; }

	virtual const char* getUniqueString() const = 0;

	protected:
	virtual void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const SK_OVERRIDE {
	desc->setFamilyName(fFamilyName.c_str());
	desc->setFontFileName(this->getUniqueString());
	*isLocal = !this->isSysFont();
	}

	private:
	bool fIsSysFont;
	SkString fFamilyName;

	typedef SkTypeface_FreeType INHERITED;
	};

	/** The empty SkTypeface implementation for the custom font manager.
	* Used as the last resort fallback typeface.
	*/
	class SkTypeface_Empty : public SkTypeface_Custom {
	public:
	SkTypeface_Empty() : INHERITED(SkTypeface::kNormal, false, true, SkString()) {}

	virtual const char* getUniqueString() const SK_OVERRIDE { return NULL; }

	protected:
	virtual SkStream* onOpenStream(int*) const SK_OVERRIDE { return NULL; }

	private:
	typedef SkTypeface_Custom INHERITED;
	};

	/** The stream SkTypeface implementation for the custom font manager. */
	class SkTypeface_Stream : public SkTypeface_Custom {
	public:
	SkTypeface_Stream(Style style, bool isFixedPitch, bool sysFont, const SkString familyName,
	SkStream* stream, int ttcIndex)
	: INHERITED(style, isFixedPitch, sysFont, familyName)
	, fStream(SkRef(stream)), fTtcIndex(ttcIndex)
	{ }

	virtual const char* getUniqueString() const SK_OVERRIDE { return NULL; }

	protected:
	virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
	*ttcIndex = 0;
	return fStream->duplicate();
	}

	private:
	SkAutoTUnref<SkStream> fStream;
	int fTtcIndex;

	typedef SkTypeface_Custom INHERITED;
	};

	/** The file SkTypeface implementation for the custom font manager. */
	class SkTypeface_File : public SkTypeface_Custom {
	public:
	SkTypeface_File(Style style, bool isFixedPitch, bool sysFont, const SkString familyName,
	const char path[])
	: INHERITED(style, isFixedPitch, sysFont, familyName)
	, fPath(path)
	{ }

	virtual const char* getUniqueString() const SK_OVERRIDE {
	const char* str = strrchr(fPath.c_str(), '/');
	if (str) {
	str += 1; // skip the '/'
	}
	return str;
	}

	protected:
	virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
	*ttcIndex = 0;
	return SkStream::NewFromFile(fPath.c_str());
	}

	private:
	SkString fPath;

	typedef SkTypeface_Custom INHERITED;
	};

	///////////////////////////////////////////////////////////////////////////////

	/**
	* SkFontStyleSet_Custom
	*
	* This class is used by SkFontMgr_Custom to hold SkTypeface_Custom families.
	*/
	class SkFontStyleSet_Custom : public SkFontStyleSet {
	public:
	explicit SkFontStyleSet_Custom(const SkString familyName) : fFamilyName(familyName) { }

	virtual int count() SK_OVERRIDE {
	return fStyles.count();
	}

	virtual void getStyle(int index, SkFontStyle* style, SkString* name) SK_OVERRIDE {
	SkASSERT(index < fStyles.count());
	bool bold = fStyles[index]->isBold();
	bool italic = fStyles[index]->isItalic();
	*style = SkFontStyle(bold ? SkFontStyle::kBold_Weight : SkFontStyle::kNormal_Weight,
	SkFontStyle::kNormal_Width,
	italic ? SkFontStyle::kItalic_Slant : SkFontStyle::kUpright_Slant);
	name->reset();
	}

	virtual SkTypeface* createTypeface(int index) SK_OVERRIDE {
	SkASSERT(index < fStyles.count());
	return SkRef(fStyles[index].get());
	}

	static int match_score(const SkFontStyle& pattern, const SkFontStyle& candidate) {
	int score = 0;
	score += (pattern.width() - candidate.width()) * 100;
	score += (pattern.isItalic() == candidate.isItalic()) ? 0 : 1000;
	score += pattern.weight() - candidate.weight();
	return score;
	}

	virtual SkTypeface* matchStyle(const SkFontStyle& pattern) SK_OVERRIDE {
	if (0 == fStyles.count()) {
	return NULL;
	}

	SkTypeface_Custom* closest = fStyles[0];
	int minScore = std::numeric_limits<int>::max();
	for (int i = 0; i < fStyles.count(); ++i) {
	bool bold = fStyles[i]->isBold();
	bool italic = fStyles[i]->isItalic();
	SkFontStyle style = SkFontStyle(bold ? SkFontStyle::kBold_Weight
	: SkFontStyle::kNormal_Weight,
	SkFontStyle::kNormal_Width,
	italic ? SkFontStyle::kItalic_Slant
	: SkFontStyle::kUpright_Slant);

	int score = match_score(pattern, style);
	if (score < minScore) {
	closest = fStyles[i];
	minScore = score;
	}
	}
	return SkRef(closest);
	}

	private:
	SkTArray<SkAutoTUnref<SkTypeface_Custom>, true> fStyles;
	SkString fFamilyName;

	void appendTypeface(SkTypeface_Custom* typeface) {
	fStyles.push_back().reset(typeface);
	}

	friend class SkFontMgr_Custom;
	};

	/**
	* SkFontMgr_Custom
	*
	* This class is essentially a collection of SkFontStyleSet_Custom,
	* one SkFontStyleSet_Custom for each family. This class may be modified
	* to load fonts from any source by changing the initialization.
	*/
	class SkFontMgr_Custom : public SkFontMgr {
	public:
	explicit SkFontMgr_Custom(const char* dir) {
	this->load_system_fonts(dir);
	}

	protected:
	virtual int onCountFamilies() const SK_OVERRIDE {
	return fFamilies.count();
	}

	virtual void onGetFamilyName(int index, SkString* familyName) const SK_OVERRIDE {
	SkASSERT(index < fFamilies.count());
	familyName->set(fFamilies[index]->fFamilyName);
	}

	virtual SkFontStyleSet_Custom* onCreateStyleSet(int index) const SK_OVERRIDE {
	SkASSERT(index < fFamilies.count());
	return SkRef(fFamilies[index].get());
	}

	virtual SkFontStyleSet_Custom* onMatchFamily(const char familyName[]) const SK_OVERRIDE {
	for (int i = 0; i < fFamilies.count(); ++i) {
	if (fFamilies[i]->fFamilyName.equals(familyName)) {
	return SkRef(fFamilies[i].get());
	}
	}
	return NULL;
	}

	virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
	const SkFontStyle& fontStyle) const SK_OVERRIDE
	{
	SkAutoTUnref<SkFontStyleSet> sset(this->matchFamily(familyName));
	return sset->matchStyle(fontStyle);
	}

	virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
	const SkFontStyle& fontStyle) const SK_OVERRIDE
	{
	for (int i = 0; i < fFamilies.count(); ++i) {
	for (int j = 0; j < fFamilies[i]->fStyles.count(); ++j) {
	if (fFamilies[i]->fStyles[j] == familyMember) {
	return fFamilies[i]->matchStyle(fontStyle);
	}
	}
	}
	return NULL;
	}

	virtual SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const SK_OVERRIDE {
	SkAutoTUnref<SkStream> stream(new SkMemoryStream(data));
	return this->createFromStream(stream, ttcIndex);
	}

	virtual SkTypeface* onCreateFromStream(SkStream* stream, int ttcIndex) const SK_OVERRIDE {
	if (NULL == stream \|\| stream->getLength() <= 0) {
	SkDELETE(stream);
	return NULL;
	}

	bool isFixedPitch;
	SkTypeface::Style style;
	SkString name;
	if (SkTypeface_FreeType::ScanFont(stream, ttcIndex, &name, &style, &isFixedPitch)) {
	return SkNEW_ARGS(SkTypeface_Stream, (style, isFixedPitch, false, name,
	stream, ttcIndex));
	} else {
	return NULL;
	}
	}

	virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const SK_OVERRIDE {
	SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
	return stream.get() ? this->createFromStream(stream, ttcIndex) : NULL;
	}

	virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
	unsigned styleBits) const SK_OVERRIDE
	{
	SkTypeface::Style oldStyle = (SkTypeface::Style)styleBits;
	SkFontStyle style = SkFontStyle(oldStyle & SkTypeface::kBold
	? SkFontStyle::kBold_Weight
	: SkFontStyle::kNormal_Weight,
	SkFontStyle::kNormal_Width,
	oldStyle & SkTypeface::kItalic
	? SkFontStyle::kItalic_Slant
	: SkFontStyle::kUpright_Slant);
	SkTypeface* tf = NULL;

	if (NULL != familyName) {
	tf = this->onMatchFamilyStyle(familyName, style);
	}

	if (NULL == tf) {
	tf = gDefaultFamily->matchStyle(style);
	}

	return SkSafeRef(tf);
	}

	private:

	static bool get_name_and_style(const char path[], SkString* name,
	SkTypeface::Style* style, bool* isFixedPitch) {
	SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(path));
	if (stream.get()) {
	return SkTypeface_FreeType::ScanFont(stream, 0, name, style, isFixedPitch);
	} else {
	SkDebugf("---- failed to open <%s> as a font\n", path);
	return false;
	}
	}

	void load_directory_fonts(const SkString& directory) {
	SkOSFile::Iter iter(directory.c_str(), ".ttf");
	SkString name;

	while (iter.next(&name, false)) {
	SkString filename(
	SkOSPath::Join(directory.c_str(), name.c_str()));

	bool isFixedPitch;
	SkString realname;
	SkTypeface::Style style = SkTypeface::kNormal; // avoid uninitialized warning

	if (!get_name_and_style(filename.c_str(), &realname, &style, &isFixedPitch)) {
	SkDebugf("------ can't load <%s> as a font\n", filename.c_str());
	continue;
	}

	SkTypeface_Custom* tf = SkNEW_ARGS(SkTypeface_File, (
	style,
	isFixedPitch,
	true, // system-font (cannot delete)
	realname,
	filename.c_str()));

	SkFontStyleSet_Custom* addTo = this->onMatchFamily(realname.c_str());
	if (NULL == addTo) {
	addTo = new SkFontStyleSet_Custom(realname);
	fFamilies.push_back().reset(addTo);
	}
	addTo->appendTypeface(tf);
	}

	SkOSFile::Iter dirIter(directory.c_str());
	while (dirIter.next(&name, true)) {
	if (name.startsWith(".")) {
	continue;
	}
	SkString dirname(SkOSPath::Join(directory.c_str(), name.c_str()));
	load_directory_fonts(dirname);
	}
	}

	void load_system_fonts(const char* dir) {
	SkString baseDirectory(dir);
	load_directory_fonts(baseDirectory);

	if (fFamilies.empty()) {
	SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
	fFamilies.push_back().reset(family);
	family->appendTypeface(SkNEW(SkTypeface_Empty));
	}

	// Try to pick a default font.
	static const char* gDefaultNames[] = {
	"Arial", "Verdana", "Times New Roman", "Droid Sans", NULL
	};
	for (size_t i = 0; i < SK_ARRAY_COUNT(gDefaultNames); ++i) {
	SkFontStyleSet_Custom* set = this->onMatchFamily(gDefaultNames[i]);
	if (NULL == set) {
	continue;
	}

	SkTypeface* tf = set->matchStyle(SkFontStyle(SkFontStyle::kNormal_Weight,
	SkFontStyle::kNormal_Width,
	SkFontStyle::kUpright_Slant));
	if (NULL == tf) {
	continue;
	}

	gDefaultFamily = set;
	gDefaultNormal = tf;
	break;
	}
	if (NULL == gDefaultNormal) {
	gDefaultFamily = fFamilies[0];
	gDefaultNormal = gDefaultFamily->fStyles[0];
	}
	}

	SkTArray<SkAutoTUnref<SkFontStyleSet_Custom>, true> fFamilies;
	SkFontStyleSet_Custom* gDefaultFamily;
	SkTypeface* gDefaultNormal;
	};

	SkFontMgr* SkFontMgr::Factory() {
	return new SkFontMgr_Custom(SK_FONT_FILE_PREFIX);
	}