src/ports/SkFontHost_fontconfig.cpp - platform/external/skqp - Gitiles

 /*
  * Copyright 2008 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 /* Derived from chromium's skia/ext/SkFontHost_fontconfig.cpp */

 #include <map>
 #include <string>

 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <unistd.h>

 #include "SkFontConfigInterface.h"
 #include "SkFontDescriptor.h"
 #include "SkFontHost.h"
 #include "SkStream.h"
 #include "SkTypeface.h"

 extern SkFontConfigInterface* SkCreateDirectFontConfigInterface();

 SK_DECLARE_STATIC_MUTEX(gFontConfigInterfaceMutex);
 static SkFontConfigInterface* gFontConfigInterface;

 SkFontConfigInterface* SkFontConfigInterface::RefGlobal() {
     SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);

     return SkSafeRef(gFontConfigInterface);
 }

 SkFontConfigInterface* SkFontConfigInterface::SetGlobal(SkFontConfigInterface* fc) {
     SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);

     SkRefCnt_SafeAssign(gFontConfigInterface, fc);
     return fc;
 }

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

 static SkFontConfigInterface* RefFCI() {
     for (;;) {
         SkFontConfigInterface* fci = SkFontConfigInterface::RefGlobal();
         if (fci) {
             return fci;
         }
         fci = SkCreateDirectFontConfigInterface();
         SkFontConfigInterface::SetGlobal(fci)->unref();
     }
 }

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

 SK_DECLARE_STATIC_MUTEX(global_remote_font_map_lock);
 static std::map<uint32_t, std::pair<uint8_t*, size_t> >* global_remote_fonts;

 // Initialize the map declared above. Note that its corresponding mutex must be
 // locked before calling this function.
 static void AllocateGlobalRemoteFontsMapOnce() {
     if (!global_remote_fonts) {
         global_remote_fonts =
             new std::map<uint32_t, std::pair<uint8_t*, size_t> >();
     }
 }

 static unsigned global_next_remote_font_id;

 // This is the maximum size of the font cache.
 static const unsigned kFontCacheMemoryBudget = 2 * 1024 * 1024;  // 2MB

 // UniqueIds are encoded as (filefaceid << 8) | style
 // For system fonts, filefaceid = (fileid << 4) | face_index.
 // For remote fonts, filefaceid = fileid.

 static unsigned UniqueIdToFileFaceId(unsigned uniqueid)
 {
     return uniqueid >> 8;
 }

 static SkTypeface::Style UniqueIdToStyle(unsigned uniqueid)
 {
     return static_cast<SkTypeface::Style>(uniqueid & 0xff);
 }

 static unsigned FileFaceIdAndStyleToUniqueId(unsigned filefaceid,
                                              SkTypeface::Style style)
 {
     SkASSERT((style & 0xff) == style);
     return (filefaceid << 8) | static_cast<int>(style);
 }

 static const unsigned kRemoteFontMask = 0x00800000u;

 static bool IsRemoteFont(unsigned filefaceid)
 {
     return filefaceid & kRemoteFontMask;
 }

 class FontConfigTypeface : public SkTypeface {
 public:
     FontConfigTypeface(Style style, uint32_t id)
         : SkTypeface(style, id) {}

     virtual ~FontConfigTypeface() {
         const uint32_t id = uniqueID();
         if (IsRemoteFont(UniqueIdToFileFaceId(id))) {
             SkAutoMutexAcquire ac(global_remote_font_map_lock);
             AllocateGlobalRemoteFontsMapOnce();
             std::map<uint32_t, std::pair<uint8_t*, size_t> >::iterator iter
                 = global_remote_fonts->find(id);
             if (iter != global_remote_fonts->end()) {
                 sk_free(iter->second.first);  // remove the font on memory.
                 global_remote_fonts->erase(iter);
             }
         }
     }
 };

 SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
                                        const char familyName[],
                                        SkTypeface::Style style) {
     SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
     if (NULL == fci.get()) {
         return NULL;
     }

     SkString familyNameStr;

     if (familyFace) {
         // Given the fileid we can ask fontconfig for the familyname of the
         // font.
         const unsigned filefaceid = UniqueIdToFileFaceId(familyFace->uniqueID());
         if (!fci->getFamilyName(filefaceid, &familyNameStr)) {
             return NULL;
         }
         familyName = familyNameStr.c_str();
     }

     unsigned filefaceid;
     if (!fci->match(familyName, style, &filefaceid, &style)) {
         return NULL;
     }

     const unsigned id = FileFaceIdAndStyleToUniqueId(filefaceid, style);
     return SkNEW_ARGS(FontConfigTypeface, (style, id));
 }

 SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
     if (!stream) {
         return NULL;
     }
     const size_t length = stream->read(0, 0);
     if (!length) {
         return NULL;
     }
     if (length >= 1024 * 1024 * 1024) {
         return NULL;  // don't accept too large fonts (>= 1GB) for safety.
     }

     uint8_t* font = (uint8_t*)sk_malloc_throw(length);
     if (stream->read(font, length) != length) {
         sk_free(font);
         return NULL;
     }

     SkTypeface::Style style = static_cast<SkTypeface::Style>(0);
     unsigned id = 0;
     {
         SkAutoMutexAcquire ac(global_remote_font_map_lock);
         AllocateGlobalRemoteFontsMapOnce();
         id = FileFaceIdAndStyleToUniqueId(
             global_next_remote_font_id | kRemoteFontMask, style);

         if (++global_next_remote_font_id >= kRemoteFontMask)
             global_next_remote_font_id = 0;

         if (!global_remote_fonts->insert(
                 std::make_pair(id, std::make_pair(font, length))).second) {
             sk_free(font);
             return NULL;
         }
     }

     return SkNEW_ARGS(FontConfigTypeface, (style, id));
 }

 SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
     SkTypeface* face = NULL;
     SkFILEStream* stream = SkNEW_ARGS(SkFILEStream, (path));

     if (stream->isValid()) {
         face = CreateTypefaceFromStream(stream);
     }
     stream->unref();
     return face;
 }

 uint32_t SkFontHost::NextLogicalFont(SkFontID curr, SkFontID orig) {
     // We don't handle font fallback.
     return 0;
 }

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

 // Serialize, Deserialize need to be compatible across platforms, hence the use
 // of SkFontDescriptor.

 void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
     SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
     SkFontDescriptor desc(face->style());
     SkString familyName;

     const unsigned filefaceid = UniqueIdToFileFaceId(face->uniqueID());
     if (fci.get() && fci->getFamilyName(filefaceid, &familyName)) {
         desc.setFamilyName(familyName.c_str());
     } else {
         desc.setFamilyName("sans-serif");
     }

     // would also like other names (see SkFontDescriptor.h)

     desc.serialize(stream);

     // by convention, we also write out the actual sfnt data, preceeded by
     // a packed-length. For now we skip that, so we just write the zero.
     stream->writePackedUInt(0);
 }

 SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
     SkFontDescriptor desc(stream);

     // by convention, Serialize will have also written the actual sfnt data.
     // for now, we just want to skip it.
     size_t size = stream->readPackedUInt();
     stream->skip(size);

     return SkFontHost::CreateTypeface(NULL, desc.getFamilyName(),
                                       desc.getStyle());
 }

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

 SkStream* SkFontHost::OpenStream(uint32_t id) {
     const unsigned filefaceid = UniqueIdToFileFaceId(id);

     if (IsRemoteFont(filefaceid)) {
       // remote font
       SkAutoMutexAcquire ac(global_remote_font_map_lock);
       AllocateGlobalRemoteFontsMapOnce();
       std::map<uint32_t, std::pair<uint8_t*, size_t> >::const_iterator iter
           = global_remote_fonts->find(id);
       if (iter == global_remote_fonts->end())
           return NULL;
       return SkNEW_ARGS(
           SkMemoryStream, (iter->second.first, iter->second.second));
     }

     // system font

     SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
     if (NULL == fci.get()) {
         return NULL;
     }
     return fci->openStream(filefaceid);
 }

 size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
                                int32_t* index) {
     const unsigned filefaceid = UniqueIdToFileFaceId(fontID);

     if (IsRemoteFont(filefaceid))
         return 0;

     if (index) {
         *index = filefaceid & 0xfu;
         // 1 is a bogus return value.
         // We had better change the signature of this function in Skia
         // to return bool to indicate success/failure and have another
         // out param for fileName length.
         if (!path)
           return 1;
     }

     if (path)
         SkASSERT(!"SkFontHost::GetFileName does not support the font path "
                   "retrieval.");

     return 0;
 }
	/*
	* Copyright 2008 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	/* Derived from chromium's skia/ext/SkFontHost_fontconfig.cpp */

	#include <map>
	#include <string>

	#include <sys/mman.h>
	#include <sys/stat.h>
	#include <unistd.h>

	#include "SkFontConfigInterface.h"
	#include "SkFontDescriptor.h"
	#include "SkFontHost.h"
	#include "SkStream.h"
	#include "SkTypeface.h"

	extern SkFontConfigInterface* SkCreateDirectFontConfigInterface();

	SK_DECLARE_STATIC_MUTEX(gFontConfigInterfaceMutex);
	static SkFontConfigInterface* gFontConfigInterface;

	SkFontConfigInterface* SkFontConfigInterface::RefGlobal() {
	SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);

	return SkSafeRef(gFontConfigInterface);
	}

	SkFontConfigInterface* SkFontConfigInterface::SetGlobal(SkFontConfigInterface* fc) {
	SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);

	SkRefCnt_SafeAssign(gFontConfigInterface, fc);
	return fc;
	}

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

	static SkFontConfigInterface* RefFCI() {
	for (;;) {
	SkFontConfigInterface* fci = SkFontConfigInterface::RefGlobal();
	if (fci) {
	return fci;
	}
	fci = SkCreateDirectFontConfigInterface();
	SkFontConfigInterface::SetGlobal(fci)->unref();
	}
	}

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

	SK_DECLARE_STATIC_MUTEX(global_remote_font_map_lock);
	static std::map<uint32_t, std::pair<uint8_t, size_t> > global_remote_fonts;

	// Initialize the map declared above. Note that its corresponding mutex must be
	// locked before calling this function.
	static void AllocateGlobalRemoteFontsMapOnce() {
	if (!global_remote_fonts) {
	global_remote_fonts =
	new std::map<uint32_t, std::pair<uint8_t*, size_t> >();
	}
	}

	static unsigned global_next_remote_font_id;

	// This is the maximum size of the font cache.
	static const unsigned kFontCacheMemoryBudget = 2 * 1024 * 1024; // 2MB

	// UniqueIds are encoded as (filefaceid << 8) \| style
	// For system fonts, filefaceid = (fileid << 4) \| face_index.
	// For remote fonts, filefaceid = fileid.

	static unsigned UniqueIdToFileFaceId(unsigned uniqueid)
	{
	return uniqueid >> 8;
	}

	static SkTypeface::Style UniqueIdToStyle(unsigned uniqueid)
	{
	return static_cast<SkTypeface::Style>(uniqueid & 0xff);
	}

	static unsigned FileFaceIdAndStyleToUniqueId(unsigned filefaceid,
	SkTypeface::Style style)
	{
	SkASSERT((style & 0xff) == style);
	return (filefaceid << 8) \| static_cast<int>(style);
	}

	static const unsigned kRemoteFontMask = 0x00800000u;

	static bool IsRemoteFont(unsigned filefaceid)
	{
	return filefaceid & kRemoteFontMask;
	}

	class FontConfigTypeface : public SkTypeface {
	public:
	FontConfigTypeface(Style style, uint32_t id)
	: SkTypeface(style, id) {}

	virtual ~FontConfigTypeface() {
	const uint32_t id = uniqueID();
	if (IsRemoteFont(UniqueIdToFileFaceId(id))) {
	SkAutoMutexAcquire ac(global_remote_font_map_lock);
	AllocateGlobalRemoteFontsMapOnce();
	std::map<uint32_t, std::pair<uint8_t*, size_t> >::iterator iter
	= global_remote_fonts->find(id);
	if (iter != global_remote_fonts->end()) {
	sk_free(iter->second.first); // remove the font on memory.
	global_remote_fonts->erase(iter);
	}
	}
	}
	};

	SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
	const char familyName[],
	SkTypeface::Style style) {
	SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
	if (NULL == fci.get()) {
	return NULL;
	}

	SkString familyNameStr;

	if (familyFace) {
	// Given the fileid we can ask fontconfig for the familyname of the
	// font.
	const unsigned filefaceid = UniqueIdToFileFaceId(familyFace->uniqueID());
	if (!fci->getFamilyName(filefaceid, &familyNameStr)) {
	return NULL;
	}
	familyName = familyNameStr.c_str();
	}

	unsigned filefaceid;
	if (!fci->match(familyName, style, &filefaceid, &style)) {
	return NULL;
	}

	const unsigned id = FileFaceIdAndStyleToUniqueId(filefaceid, style);
	return SkNEW_ARGS(FontConfigTypeface, (style, id));
	}

	SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
	if (!stream) {
	return NULL;
	}
	const size_t length = stream->read(0, 0);
	if (!length) {
	return NULL;
	}
	if (length >= 1024 * 1024 * 1024) {
	return NULL; // don't accept too large fonts (>= 1GB) for safety.
	}

	uint8_t* font = (uint8_t*)sk_malloc_throw(length);
	if (stream->read(font, length) != length) {
	sk_free(font);
	return NULL;
	}

	SkTypeface::Style style = static_cast<SkTypeface::Style>(0);
	unsigned id = 0;
	{
	SkAutoMutexAcquire ac(global_remote_font_map_lock);
	AllocateGlobalRemoteFontsMapOnce();
	id = FileFaceIdAndStyleToUniqueId(
	global_next_remote_font_id \| kRemoteFontMask, style);

	if (++global_next_remote_font_id >= kRemoteFontMask)
	global_next_remote_font_id = 0;

	if (!global_remote_fonts->insert(
	std::make_pair(id, std::make_pair(font, length))).second) {
	sk_free(font);
	return NULL;
	}
	}

	return SkNEW_ARGS(FontConfigTypeface, (style, id));
	}

	SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
	SkTypeface* face = NULL;
	SkFILEStream* stream = SkNEW_ARGS(SkFILEStream, (path));

	if (stream->isValid()) {
	face = CreateTypefaceFromStream(stream);
	}
	stream->unref();
	return face;
	}

	uint32_t SkFontHost::NextLogicalFont(SkFontID curr, SkFontID orig) {
	// We don't handle font fallback.
	return 0;
	}

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

	// Serialize, Deserialize need to be compatible across platforms, hence the use
	// of SkFontDescriptor.

	void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
	SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
	SkFontDescriptor desc(face->style());
	SkString familyName;

	const unsigned filefaceid = UniqueIdToFileFaceId(face->uniqueID());
	if (fci.get() && fci->getFamilyName(filefaceid, &familyName)) {
	desc.setFamilyName(familyName.c_str());
	} else {
	desc.setFamilyName("sans-serif");
	}

	// would also like other names (see SkFontDescriptor.h)

	desc.serialize(stream);

	// by convention, we also write out the actual sfnt data, preceeded by
	// a packed-length. For now we skip that, so we just write the zero.
	stream->writePackedUInt(0);
	}

	SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
	SkFontDescriptor desc(stream);

	// by convention, Serialize will have also written the actual sfnt data.
	// for now, we just want to skip it.
	size_t size = stream->readPackedUInt();
	stream->skip(size);

	return SkFontHost::CreateTypeface(NULL, desc.getFamilyName(),
	desc.getStyle());
	}

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

	SkStream* SkFontHost::OpenStream(uint32_t id) {
	const unsigned filefaceid = UniqueIdToFileFaceId(id);

	if (IsRemoteFont(filefaceid)) {
	// remote font
	SkAutoMutexAcquire ac(global_remote_font_map_lock);
	AllocateGlobalRemoteFontsMapOnce();
	std::map<uint32_t, std::pair<uint8_t*, size_t> >::const_iterator iter
	= global_remote_fonts->find(id);
	if (iter == global_remote_fonts->end())
	return NULL;
	return SkNEW_ARGS(
	SkMemoryStream, (iter->second.first, iter->second.second));
	}

	// system font

	SkAutoTUnref<SkFontConfigInterface> fci(RefFCI());
	if (NULL == fci.get()) {
	return NULL;
	}
	return fci->openStream(filefaceid);
	}

	size_t SkFontHost::GetFileName(SkFontID fontID, char path[], size_t length,
	int32_t* index) {
	const unsigned filefaceid = UniqueIdToFileFaceId(fontID);

	if (IsRemoteFont(filefaceid))
	return 0;

	if (index) {
	*index = filefaceid & 0xfu;
	// 1 is a bogus return value.
	// We had better change the signature of this function in Skia
	// to return bool to indicate success/failure and have another
	// out param for fileName length.
	if (!path)
	return 1;
	}

	if (path)
	SkASSERT(!"SkFontHost::GetFileName does not support the font path "
	"retrieval.");

	return 0;
	}