| /* |
| * Copyright 2011 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 "SkAdvancedTypefaceMetrics.h" |
| #include "SkEndian.h" |
| #include "SkFontDescriptor.h" |
| #include "SkFontMgr.h" |
| #include "SkMutex.h" |
| #include "SkOTTable_OS_2.h" |
| #include "SkOncePtr.h" |
| #include "SkStream.h" |
| #include "SkTypeface.h" |
| |
| SkTypeface::SkTypeface(const SkFontStyle& style, SkFontID fontID, bool isFixedPitch) |
| : fUniqueID(fontID), fStyle(style), fIsFixedPitch(isFixedPitch) { } |
| |
| SkTypeface::~SkTypeface() { } |
| |
| #ifdef SK_WHITELIST_SERIALIZED_TYPEFACES |
| extern void WhitelistSerializeTypeface(const SkTypeface*, SkWStream* ); |
| #define SK_TYPEFACE_DELEGATE WhitelistSerializeTypeface |
| #else |
| #define SK_TYPEFACE_DELEGATE nullptr |
| #endif |
| |
| SkTypeface* (*gCreateTypefaceDelegate)(const char [], SkTypeface::Style ) = nullptr; |
| void (*gSerializeTypefaceDelegate)(const SkTypeface*, SkWStream* ) = SK_TYPEFACE_DELEGATE; |
| SkTypeface* (*gDeserializeTypefaceDelegate)(SkStream* ) = nullptr; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkEmptyTypeface : public SkTypeface { |
| public: |
| static SkEmptyTypeface* Create() { return new SkEmptyTypeface; } |
| protected: |
| SkEmptyTypeface() : SkTypeface(SkFontStyle(), 0, true) { } |
| |
| SkStreamAsset* onOpenStream(int* ttcIndex) const override { return nullptr; } |
| SkScalerContext* onCreateScalerContext(const SkDescriptor*) const override { |
| return nullptr; |
| } |
| void onFilterRec(SkScalerContextRec*) const override { } |
| virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics( |
| PerGlyphInfo, |
| const uint32_t*, uint32_t) const override { return nullptr; } |
| void onGetFontDescriptor(SkFontDescriptor*, bool*) const override { } |
| virtual int onCharsToGlyphs(const void* chars, Encoding encoding, |
| uint16_t glyphs[], int glyphCount) const override { |
| if (glyphs && glyphCount > 0) { |
| sk_bzero(glyphs, glyphCount * sizeof(glyphs[0])); |
| } |
| return 0; |
| } |
| int onCountGlyphs() const override { return 0; }; |
| int onGetUPEM() const override { return 0; }; |
| class EmptyLocalizedStrings : public SkTypeface::LocalizedStrings { |
| public: |
| bool next(SkTypeface::LocalizedString*) override { return false; } |
| }; |
| void onGetFamilyName(SkString* familyName) const override { |
| familyName->reset(); |
| } |
| SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override { |
| return new EmptyLocalizedStrings; |
| }; |
| int onGetTableTags(SkFontTableTag tags[]) const override { return 0; } |
| size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const override { |
| return 0; |
| } |
| }; |
| |
| SK_DECLARE_STATIC_MUTEX(gCreateDefaultMutex); |
| SK_DECLARE_STATIC_ONCE_PTR(SkTypeface, defaults[4]); |
| |
| SkTypeface* SkTypeface::GetDefaultTypeface(Style style) { |
| SkASSERT((int)style < 4); |
| return defaults[style].get([=]{ |
| // It is not safe to call FontConfigTypeface::LegacyCreateTypeface concurrently. |
| // To be safe, we serialize here with a mutex so only one call to |
| // CreateTypeface is happening at any given time. |
| // TODO(bungeman, mtklein): This is sad. Make our fontconfig code safe? |
| SkAutoMutexAcquire lock(&gCreateDefaultMutex); |
| |
| SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| SkTypeface* t = fm->legacyCreateTypeface(nullptr, style); |
| return t ? t : SkEmptyTypeface::Create(); |
| }); |
| } |
| |
| SkTypeface* SkTypeface::RefDefault(Style style) { |
| return SkRef(GetDefaultTypeface(style)); |
| } |
| |
| uint32_t SkTypeface::UniqueID(const SkTypeface* face) { |
| if (nullptr == face) { |
| face = GetDefaultTypeface(); |
| } |
| return face->uniqueID(); |
| } |
| |
| bool SkTypeface::Equal(const SkTypeface* facea, const SkTypeface* faceb) { |
| return facea == faceb || SkTypeface::UniqueID(facea) == SkTypeface::UniqueID(faceb); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkTypeface* SkTypeface::CreateFromName(const char name[], Style style) { |
| if (gCreateTypefaceDelegate) { |
| SkTypeface* result = (*gCreateTypefaceDelegate)(name, style); |
| if (result) { |
| return result; |
| } |
| } |
| if (nullptr == name) { |
| return RefDefault(style); |
| } |
| SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return fm->legacyCreateTypeface(name, style); |
| } |
| |
| SkTypeface* SkTypeface::CreateFromTypeface(const SkTypeface* family, Style s) { |
| if (!family) { |
| return SkTypeface::RefDefault(s); |
| } |
| |
| if (family->style() == s) { |
| family->ref(); |
| return const_cast<SkTypeface*>(family); |
| } |
| |
| SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| bool bold = s & SkTypeface::kBold; |
| bool italic = s & SkTypeface::kItalic; |
| SkFontStyle newStyle = SkFontStyle(bold ? SkFontStyle::kBold_Weight |
| : SkFontStyle::kNormal_Weight, |
| SkFontStyle::kNormal_Width, |
| italic ? SkFontStyle::kItalic_Slant |
| : SkFontStyle::kUpright_Slant); |
| return fm->matchFaceStyle(family, newStyle); |
| } |
| |
| SkTypeface* SkTypeface::CreateFromStream(SkStreamAsset* stream, int index) { |
| SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return fm->createFromStream(stream, index); |
| } |
| |
| SkTypeface* SkTypeface::CreateFromFontData(SkFontData* data) { |
| SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return fm->createFromFontData(data); |
| } |
| |
| SkTypeface* SkTypeface::CreateFromFile(const char path[], int index) { |
| SkAutoTUnref<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return fm->createFromFile(path, index); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkTypeface::serialize(SkWStream* wstream) const { |
| if (gSerializeTypefaceDelegate) { |
| (*gSerializeTypefaceDelegate)(this, wstream); |
| return; |
| } |
| bool isLocal = false; |
| SkFontDescriptor desc(this->style()); |
| this->onGetFontDescriptor(&desc, &isLocal); |
| |
| // Embed font data if it's a local font. |
| if (isLocal && !desc.hasFontData()) { |
| desc.setFontData(this->onCreateFontData()); |
| } |
| desc.serialize(wstream); |
| } |
| |
| SkTypeface* SkTypeface::Deserialize(SkStream* stream) { |
| if (gDeserializeTypefaceDelegate) { |
| return (*gDeserializeTypefaceDelegate)(stream); |
| } |
| |
| SkFontDescriptor desc; |
| if (!SkFontDescriptor::Deserialize(stream, &desc)) { |
| return nullptr; |
| } |
| |
| SkFontData* data = desc.detachFontData(); |
| if (data) { |
| SkTypeface* typeface = SkTypeface::CreateFromFontData(data); |
| if (typeface) { |
| return typeface; |
| } |
| } |
| return SkTypeface::CreateFromName(desc.getFamilyName(), desc.getStyle()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| int SkTypeface::countTables() const { |
| return this->onGetTableTags(nullptr); |
| } |
| |
| int SkTypeface::getTableTags(SkFontTableTag tags[]) const { |
| return this->onGetTableTags(tags); |
| } |
| |
| size_t SkTypeface::getTableSize(SkFontTableTag tag) const { |
| return this->onGetTableData(tag, 0, ~0U, nullptr); |
| } |
| |
| size_t SkTypeface::getTableData(SkFontTableTag tag, size_t offset, size_t length, |
| void* data) const { |
| return this->onGetTableData(tag, offset, length, data); |
| } |
| |
| SkStreamAsset* SkTypeface::openStream(int* ttcIndex) const { |
| int ttcIndexStorage; |
| if (nullptr == ttcIndex) { |
| // So our subclasses don't need to check for null param |
| ttcIndex = &ttcIndexStorage; |
| } |
| return this->onOpenStream(ttcIndex); |
| } |
| |
| SkFontData* SkTypeface::createFontData() const { |
| return this->onCreateFontData(); |
| } |
| |
| // This implementation is temporary until this method can be made pure virtual. |
| SkFontData* SkTypeface::onCreateFontData() const { |
| int index; |
| SkAutoTDelete<SkStreamAsset> stream(this->onOpenStream(&index)); |
| return new SkFontData(stream.detach(), index, nullptr, 0); |
| }; |
| |
| int SkTypeface::charsToGlyphs(const void* chars, Encoding encoding, |
| uint16_t glyphs[], int glyphCount) const { |
| if (glyphCount <= 0) { |
| return 0; |
| } |
| if (nullptr == chars || (unsigned)encoding > kUTF32_Encoding) { |
| if (glyphs) { |
| sk_bzero(glyphs, glyphCount * sizeof(glyphs[0])); |
| } |
| return 0; |
| } |
| return this->onCharsToGlyphs(chars, encoding, glyphs, glyphCount); |
| } |
| |
| int SkTypeface::countGlyphs() const { |
| return this->onCountGlyphs(); |
| } |
| |
| int SkTypeface::getUnitsPerEm() const { |
| // should we try to cache this in the base-class? |
| return this->onGetUPEM(); |
| } |
| |
| bool SkTypeface::getKerningPairAdjustments(const uint16_t glyphs[], int count, |
| int32_t adjustments[]) const { |
| SkASSERT(count >= 0); |
| // check for the only legal way to pass a nullptr.. everything is 0 |
| // in which case they just want to know if this face can possibly support |
| // kerning (true) or never (false). |
| if (nullptr == glyphs || nullptr == adjustments) { |
| SkASSERT(nullptr == glyphs); |
| SkASSERT(0 == count); |
| SkASSERT(nullptr == adjustments); |
| } |
| return this->onGetKerningPairAdjustments(glyphs, count, adjustments); |
| } |
| |
| SkTypeface::LocalizedStrings* SkTypeface::createFamilyNameIterator() const { |
| return this->onCreateFamilyNameIterator(); |
| } |
| |
| void SkTypeface::getFamilyName(SkString* name) const { |
| SkASSERT(name); |
| this->onGetFamilyName(name); |
| } |
| |
| SkAdvancedTypefaceMetrics* SkTypeface::getAdvancedTypefaceMetrics( |
| PerGlyphInfo info, |
| const uint32_t* glyphIDs, |
| uint32_t glyphIDsCount) const { |
| SkAdvancedTypefaceMetrics* result = |
| this->onGetAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount); |
| if (result && result->fType == SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| struct SkOTTableOS2 os2table; |
| if (this->getTableData(SkTEndian_SwapBE32(SkOTTableOS2::TAG), 0, |
| sizeof(os2table), &os2table) > 0) { |
| if (os2table.version.v2.fsType.field.Bitmap || |
| (os2table.version.v2.fsType.field.Restricted && |
| !(os2table.version.v2.fsType.field.PreviewPrint || |
| os2table.version.v2.fsType.field.Editable))) { |
| result->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( |
| result->fFlags, |
| SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag); |
| } |
| if (os2table.version.v2.fsType.field.NoSubsetting) { |
| result->fFlags = SkTBitOr<SkAdvancedTypefaceMetrics::FontFlags>( |
| result->fFlags, |
| SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag); |
| } |
| } |
| } |
| return result; |
| } |
| |
| bool SkTypeface::onGetKerningPairAdjustments(const uint16_t glyphs[], int count, |
| int32_t adjustments[]) const { |
| return false; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkDescriptor.h" |
| #include "SkPaint.h" |
| |
| SkRect SkTypeface::getBounds() const { |
| return *fLazyBounds.get([&] { |
| SkRect* rect = new SkRect; |
| if (!this->onComputeBounds(rect)) { |
| rect->setEmpty(); |
| } |
| return rect; |
| }); |
| } |
| |
| bool SkTypeface::onComputeBounds(SkRect* bounds) const { |
| // we use a big size to ensure lots of significant bits from the scalercontext. |
| // then we scale back down to return our final answer (at 1-pt) |
| const SkScalar textSize = 2048; |
| const SkScalar invTextSize = 1 / textSize; |
| |
| SkPaint paint; |
| paint.setTypeface(const_cast<SkTypeface*>(this)); |
| paint.setTextSize(textSize); |
| paint.setLinearText(true); |
| |
| SkScalerContext::Rec rec; |
| SkScalerContext::MakeRec(paint, nullptr, nullptr, &rec); |
| |
| SkAutoDescriptor ad(sizeof(rec) + SkDescriptor::ComputeOverhead(1)); |
| SkDescriptor* desc = ad.getDesc(); |
| desc->init(); |
| desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); |
| |
| SkAutoTDelete<SkScalerContext> ctx(this->createScalerContext(desc, true)); |
| if (ctx.get()) { |
| SkPaint::FontMetrics fm; |
| ctx->getFontMetrics(&fm); |
| bounds->set(fm.fXMin * invTextSize, fm.fTop * invTextSize, |
| fm.fXMax * invTextSize, fm.fBottom * invTextSize); |
| return true; |
| } |
| return false; |
| } |
| |
