/*
* 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 "SkFontDescriptor.h"
#include "SkFontHost_FreeType_common.h"
#include "SkFontMgr.h"
#include "SkFontMgr_custom.h"
#include "SkFontStyle.h"
#include "SkOSFile.h"
#include "SkRefCnt.h"
#include "SkStream.h"
#include "SkString.h"
#include "SkTArray.h"
#include "SkTemplates.h"
#include "SkTypeface.h"
#include "SkTypefaceCache.h"
#include "SkTypes.h"
#include <limits>
class SkData;
/** 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; }
protected:
void onGetFamilyName(SkString* familyName) const override {
*familyName = fFamilyName;
}
void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const override {
desc->setFamilyName(fFamilyName.c_str());
*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) {}
protected:
SkStreamAsset* onOpenStream(int*) const override { return nullptr; }
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, SkStreamAsset* stream, int index)
: INHERITED(style, isFixedPitch, sysFont, familyName, index)
, fStream(stream)
{ }
protected:
SkStreamAsset* onOpenStream(int* ttcIndex) const override {
*ttcIndex = this->getIndex();
return fStream->duplicate();
}
private:
const SkAutoTDelete<const SkStreamAsset> fStream;
typedef SkTypeface_Custom INHERITED;
};
/** 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)
{ }
protected:
SkStreamAsset* onOpenStream(int* ttcIndex) const override {
*ttcIndex = this->getIndex();
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) { }
/** Should only be called during the inital build phase. */
void appendTypeface(SkTypeface_Custom* typeface) {
fStyles.push_back().reset(typeface);
}
int count() override {
return fStyles.count();
}
void getStyle(int index, SkFontStyle* style, SkString* name) 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();
}
SkTypeface* createTypeface(int index) 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;
}
SkTypeface* matchStyle(const SkFontStyle& pattern) override {
if (0 == fStyles.count()) {
return nullptr;
}
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);
}
SkString getFamilyName() { return fFamilyName; }
private:
SkTArray<SkAutoTUnref<SkTypeface_Custom>, true> fStyles;
SkString fFamilyName;
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:
typedef SkTArray<SkAutoTUnref<SkFontStyleSet_Custom>, true> Families;
class SystemFontLoader {
public:
virtual ~SystemFontLoader() { }
virtual void loadSystemFonts(const SkTypeface_FreeType::Scanner&, Families*) const = 0;
};
explicit SkFontMgr_Custom(const SystemFontLoader& loader) : fDefaultFamily(nullptr) {
loader.loadSystemFonts(fScanner, &fFamilies);
// Try to pick a default font.
static const char* defaultNames[] = {
"Arial", "Verdana", "Times New Roman", "Droid Sans", nullptr
};
for (size_t i = 0; i < SK_ARRAY_COUNT(defaultNames); ++i) {
SkFontStyleSet_Custom* set = this->onMatchFamily(defaultNames[i]);
if (nullptr == set) {
continue;
}
SkTypeface* tf = set->matchStyle(SkFontStyle(SkFontStyle::kNormal_Weight,
SkFontStyle::kNormal_Width,
SkFontStyle::kUpright_Slant));
if (nullptr == tf) {
continue;
}
fDefaultFamily = set;
break;
}
if (nullptr == fDefaultFamily) {
fDefaultFamily = fFamilies[0];
}
}
protected:
int onCountFamilies() const override {
return fFamilies.count();
}
void onGetFamilyName(int index, SkString* familyName) const override {
SkASSERT(index < fFamilies.count());
familyName->set(fFamilies[index]->getFamilyName());
}
SkFontStyleSet_Custom* onCreateStyleSet(int index) const override {
SkASSERT(index < fFamilies.count());
return SkRef(fFamilies[index].get());
}
SkFontStyleSet_Custom* onMatchFamily(const char familyName[]) const override {
for (int i = 0; i < fFamilies.count(); ++i) {
if (fFamilies[i]->getFamilyName().equals(familyName)) {
return SkRef(fFamilies[i].get());
}
}
return nullptr;
}
SkTypeface* onMatchFamilyStyle(const char familyName[],
const SkFontStyle& fontStyle) const override
{
SkAutoTUnref<SkFontStyleSet> sset(this->matchFamily(familyName));
return sset->matchStyle(fontStyle);
}
SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
const char* bcp47[], int bcp47Count,
SkUnichar character) const override
{
return nullptr;
}
SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
const SkFontStyle& fontStyle) const 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 nullptr;
}
SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const override {
return this->createFromStream(new SkMemoryStream(data), ttcIndex);
}
SkTypeface* onCreateFromStream(SkStreamAsset* bareStream, int ttcIndex) const override {
SkAutoTDelete<SkStreamAsset> stream(bareStream);
if (nullptr == stream || stream->getLength() <= 0) {
return nullptr;
}
bool isFixedPitch;
SkFontStyle style;
SkString name;
if (fScanner.scanFont(stream, ttcIndex, &name, &style, &isFixedPitch, nullptr)) {
return new SkTypeface_Stream(style, isFixedPitch, false, name, stream.detach(),
ttcIndex);
} else {
return nullptr;
}
}
SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override {
SkAutoTDelete<SkStreamAsset> stream(SkStream::NewFromFile(path));
return stream.get() ? this->createFromStream(stream.detach(), ttcIndex) : nullptr;
}
SkTypeface* onLegacyCreateTypeface(const char familyName[], unsigned styleBits) const 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 = nullptr;
if (familyName) {
tf = this->onMatchFamilyStyle(familyName, style);
}
if (nullptr == tf) {
tf = fDefaultFamily->matchStyle(style);
}
return SkSafeRef(tf);
}
private:
Families fFamilies;
SkFontStyleSet_Custom* fDefaultFamily;
SkTypeface_FreeType::Scanner fScanner;
};
///////////////////////////////////////////////////////////////////////////////
class DirectorySystemFontLoader : public SkFontMgr_Custom::SystemFontLoader {
public:
DirectorySystemFontLoader(const char* dir) : fBaseDirectory(dir) { }
void loadSystemFonts(const SkTypeface_FreeType::Scanner& scanner,
SkFontMgr_Custom::Families* families) const override
{
load_directory_fonts(scanner, fBaseDirectory, ".ttf", families);
load_directory_fonts(scanner, fBaseDirectory, ".ttc", families);
load_directory_fonts(scanner, fBaseDirectory, ".otf", families);
load_directory_fonts(scanner, fBaseDirectory, ".pfb", families);
if (families->empty()) {
SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
families->push_back().reset(family);
family->appendTypeface(new SkTypeface_Empty);
}
}
private:
static SkFontStyleSet_Custom* find_family(SkFontMgr_Custom::Families& families,
const char familyName[])
{
for (int i = 0; i < families.count(); ++i) {
if (families[i]->getFamilyName().equals(familyName)) {
return families[i].get();
}
}
return nullptr;
}
static void load_directory_fonts(const SkTypeface_FreeType::Scanner& scanner,
const SkString& directory, const char* suffix,
SkFontMgr_Custom::Families* families)
{
SkOSFile::Iter iter(directory.c_str(), suffix);
SkString name;
while (iter.next(&name, false)) {
SkString filename(SkOSPath::Join(directory.c_str(), name.c_str()));
SkAutoTDelete<SkStream> stream(SkStream::NewFromFile(filename.c_str()));
if (!stream.get()) {
SkDebugf("---- failed to open <%s>\n", filename.c_str());
continue;
}
int numFaces;
if (!scanner.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 (!scanner.scanFont(stream, faceIndex, &realname, &style, &isFixedPitch, nullptr)) {
SkDebugf("---- failed to open <%s> <%d> as a font\n",
filename.c_str(), faceIndex);
continue;
}
SkTypeface_Custom* tf = new SkTypeface_File(style, isFixedPitch,
true, // system-font (cannot delete)
realname, filename.c_str(), faceIndex);
SkFontStyleSet_Custom* addTo = find_family(*families, realname.c_str());
if (nullptr == addTo) {
addTo = new SkFontStyleSet_Custom(realname);
families->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(scanner, dirname, suffix, families);
}
}
SkString fBaseDirectory;
};
SK_API SkFontMgr* SkFontMgr_New_Custom_Directory(const char* dir) {
return new SkFontMgr_Custom(DirectorySystemFontLoader(dir));
}
///////////////////////////////////////////////////////////////////////////////
struct SkEmbeddedResource { const uint8_t* data; size_t size; };
struct SkEmbeddedResourceHeader { const SkEmbeddedResource* entries; int count; };
class EmbeddedSystemFontLoader : public SkFontMgr_Custom::SystemFontLoader {
public:
EmbeddedSystemFontLoader(const SkEmbeddedResourceHeader* header) : fHeader(header) { }
void loadSystemFonts(const SkTypeface_FreeType::Scanner& scanner,
SkFontMgr_Custom::Families* families) const override
{
for (int i = 0; i < fHeader->count; ++i) {
const SkEmbeddedResource& fontEntry = fHeader->entries[i];
load_embedded_font(scanner, fontEntry.data, fontEntry.size, i, families);
}
if (families->empty()) {
SkFontStyleSet_Custom* family = new SkFontStyleSet_Custom(SkString());
families->push_back().reset(family);
family->appendTypeface(new SkTypeface_Empty);
}
}
private:
static SkFontStyleSet_Custom* find_family(SkFontMgr_Custom::Families& families,
const char familyName[])
{
for (int i = 0; i < families.count(); ++i) {
if (families[i]->getFamilyName().equals(familyName)) {
return families[i].get();
}
}
return nullptr;
}
static void load_embedded_font(const SkTypeface_FreeType::Scanner& scanner,
const uint8_t* data, size_t size, int index,
SkFontMgr_Custom::Families* families)
{
SkAutoTDelete<SkMemoryStream> stream(new SkMemoryStream(data, size, false));
int numFaces;
if (!scanner.recognizedFont(stream, &numFaces)) {
SkDebugf("---- failed to open <%d> as a font\n", index);
return;
}
for (int faceIndex = 0; faceIndex < numFaces; ++faceIndex) {
bool isFixedPitch;
SkString realname;
SkFontStyle style = SkFontStyle(); // avoid uninitialized warning
if (!scanner.scanFont(stream, faceIndex, &realname, &style, &isFixedPitch, nullptr)) {
SkDebugf("---- failed to open <%d> <%d> as a font\n", index, faceIndex);
return;
}
SkTypeface_Custom* tf =
new SkTypeface_Stream(style, isFixedPitch, true, // system-font (cannot delete)
realname, stream.detach(), faceIndex);
SkFontStyleSet_Custom* addTo = find_family(*families, realname.c_str());
if (nullptr == addTo) {
addTo = new SkFontStyleSet_Custom(realname);
families->push_back().reset(addTo);
}
addTo->appendTypeface(tf);
}
}
const SkEmbeddedResourceHeader* fHeader;
};
SkFontMgr* SkFontMgr_New_Custom_Embedded(const SkEmbeddedResourceHeader* header) {
return new SkFontMgr_Custom(EmbeddedSystemFontLoader(header));
}