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/*
* 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 "SkRTConf.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/"
#endif
///////////////////////////////////////////////////////////////////////////////
/** The base SkTypeface implementation for the custom font manager. */
class SkTypeface_Custom : public SkTypeface_FreeType {
public:
SkTypeface_Custom(const SkFontStyle& style, bool isFixedPitch,
bool sysFont, const SkString familyName, int index)
: INHERITED(style, SkTypefaceCache::NewFontID(), isFixedPitch)
, fIsSysFont(sysFont), fFamilyName(familyName), fIndex(index)
{ }
bool isSysFont() const { return fIsSysFont; }
virtual const char* getUniqueString() const = 0;
protected:
virtual void onGetFamilyName(SkString* familyName) const SK_OVERRIDE {
*familyName = fFamilyName;
}
virtual void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const SK_OVERRIDE {
desc->setFamilyName(fFamilyName.c_str());
desc->setFontFileName(this->getUniqueString());
desc->setFontIndex(fIndex);
*isLocal = !this->isSysFont();
}
int getIndex() const { return fIndex; }
private:
const bool fIsSysFont;
const SkString fFamilyName;
const int fIndex;
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(SkFontStyle(), false, true, SkString(), 0) {}
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(const SkFontStyle& style, bool isFixedPitch, bool sysFont,
const SkString familyName, SkStream* stream, int index)
: INHERITED(style, isFixedPitch, sysFont, familyName, index)
, fStream(SkRef(stream))
{ }
virtual const char* getUniqueString() const SK_OVERRIDE { return NULL; }
protected:
virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
*ttcIndex = this->getIndex();
return fStream->duplicate();
}
private:
const SkAutoTUnref<const SkStream> fStream;
typedef SkTypeface_Custom INHERITED;
};
// This configuration option is useful if we need to open and hold handles to
// all found system font data (e.g., for skfiddle, where the application can't
// access the filesystem to read fonts on demand)
SK_CONF_DECLARE(bool, c_CustomTypefaceRetain, "fonts.customFont.retainAllData", false,
"Retain the open stream for each found font on the system.");
/** The file SkTypeface implementation for the custom font manager. */
class SkTypeface_File : public SkTypeface_Custom {
public:
SkTypeface_File(const SkFontStyle& style, bool isFixedPitch, bool sysFont,
const SkString familyName, const char path[], int index)
: INHERITED(style, isFixedPitch, sysFont, familyName, index)
, fPath(path)
, fStream(c_CustomTypefaceRetain ? SkStream::NewFromFile(fPath.c_str()) : NULL)
{ }
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 = this->getIndex();
if (fStream.get()) {
return fStream->duplicate();
} else {
return SkStream::NewFromFile(fPath.c_str());
}
}
private:
SkString fPath;
const SkAutoTUnref<SkStreamAsset> fStream;
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* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
const char* bcp47[], int bcp47Count,
SkUnichar character) const SK_OVERRIDE
{
return NULL;
}
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;
SkFontStyle style;
SkString name;
if (fScanner.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 (familyName) {
tf = this->onMatchFamilyStyle(familyName, style);
}
if (NULL == tf) {
tf = gDefaultFamily->matchStyle(style);
}
return SkSafeRef(tf);
}
private:
void load_directory_fonts(const SkString& directory, const char* suffix) {
SkOSFile::Iter iter(directory.c_str(), suffix);
SkString name;
while (iter.next(&name, false)) {
SkString filename(SkOSPath::Join(directory.c_str(), name.c_str()));
SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(filename.c_str()));
if (!stream.get()) {
SkDebugf("---- failed to open <%s>\n", filename.c_str());
continue;
}
int numFaces;
if (!fScanner.recognizedFont(stream, &numFaces)) {
SkDebugf("---- failed to open <%s> as a font\n", filename.c_str());
continue;
}
for (int faceIndex = 0; faceIndex < numFaces; ++faceIndex) {
bool isFixedPitch;
SkString realname;
SkFontStyle style = SkFontStyle(); // avoid uninitialized warning
if (!fScanner.scanFont(stream, faceIndex, &realname, &style, &isFixedPitch)) {
SkDebugf("---- failed to open <%s> <%d> as a font\n",
filename.c_str(), faceIndex);
continue;
}
SkTypeface_Custom* tf = SkNEW_ARGS(SkTypeface_File, (
style,
isFixedPitch,
true, // system-font (cannot delete)
realname,
filename.c_str(), 0));
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, suffix);
}
}
void load_system_fonts(const char* dir) {
SkString baseDirectory(dir);
load_directory_fonts(baseDirectory, ".ttf");
load_directory_fonts(baseDirectory, ".ttc");
load_directory_fonts(baseDirectory, ".otf");
load_directory_fonts(baseDirectory, ".pfb");
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;
SkTypeface_FreeType::Scanner fScanner;
};
SkFontMgr* SkFontMgr::Factory() {
return new SkFontMgr_Custom(SK_FONT_FILE_PREFIX);
}