| /* |
| * 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 "SkMakeUnique.h" |
| #include "SkMutex.h" |
| #include "SkOTTable_OS_2.h" |
| #include "SkOnce.h" |
| #include "SkStream.h" |
| #include "SkTypeface.h" |
| #include "SkTypefaceCache.h" |
| |
| SkTypeface::SkTypeface(const SkFontStyle& style, bool isFixedPitch) |
| : fUniqueID(SkTypefaceCache::NewFontID()), 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 |
| |
| sk_sp<SkTypeface> (*gCreateTypefaceDelegate)(const char[], SkFontStyle) = nullptr; |
| |
| void (*gSerializeTypefaceDelegate)(const SkTypeface*, SkWStream* ) = SK_TYPEFACE_DELEGATE; |
| sk_sp<SkTypeface> (*gDeserializeTypefaceDelegate)(SkStream* ) = nullptr; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| |
| class SkEmptyTypeface : public SkTypeface { |
| public: |
| static SkEmptyTypeface* Create() { return new SkEmptyTypeface; } |
| protected: |
| SkEmptyTypeface() : SkTypeface(SkFontStyle(), true) { } |
| |
| SkStreamAsset* onOpenStream(int* ttcIndex) const override { return nullptr; } |
| SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&, |
| const SkDescriptor*) const override { |
| return nullptr; |
| } |
| void onFilterRec(SkScalerContextRec*) const override { } |
| std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() 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 onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[], |
| int coordinateCount) const override |
| { |
| return 0; |
| } |
| int onGetTableTags(SkFontTableTag tags[]) const override { return 0; } |
| size_t onGetTableData(SkFontTableTag, size_t, size_t, void*) const override { |
| return 0; |
| } |
| }; |
| |
| } |
| |
| SkTypeface* SkTypeface::GetDefaultTypeface(Style style) { |
| static SkOnce once[4]; |
| static SkTypeface* defaults[4]; |
| |
| SkASSERT((int)style < 4); |
| once[style]([style] { |
| sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| SkTypeface* t = fm->legacyCreateTypeface(nullptr, SkFontStyle::FromOldStyle(style)); |
| defaults[style] = t ? t : SkEmptyTypeface::Create(); |
| }); |
| return defaults[style]; |
| } |
| |
| sk_sp<SkTypeface> SkTypeface::MakeDefault(Style style) { |
| return sk_ref_sp(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); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkTypeface> SkTypeface::MakeFromName(const char name[], |
| SkFontStyle fontStyle) { |
| if (gCreateTypefaceDelegate) { |
| sk_sp<SkTypeface> result = (*gCreateTypefaceDelegate)(name, fontStyle); |
| if (result) { |
| return result; |
| } |
| } |
| if (nullptr == name && (fontStyle.slant() == SkFontStyle::kItalic_Slant || |
| fontStyle.slant() == SkFontStyle::kUpright_Slant) && |
| (fontStyle.weight() == SkFontStyle::kBold_Weight || |
| fontStyle.weight() == SkFontStyle::kNormal_Weight)) { |
| return MakeDefault(static_cast<SkTypeface::Style>( |
| (fontStyle.slant() == SkFontStyle::kItalic_Slant ? SkTypeface::kItalic : |
| SkTypeface::kNormal) | |
| (fontStyle.weight() == SkFontStyle::kBold_Weight ? SkTypeface::kBold : |
| SkTypeface::kNormal))); |
| } |
| sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return sk_sp<SkTypeface>(fm->legacyCreateTypeface(name, fontStyle)); |
| } |
| |
| sk_sp<SkTypeface> SkTypeface::MakeFromTypeface(SkTypeface* family, Style s) { |
| if (!family) { |
| return SkTypeface::MakeDefault(s); |
| } |
| |
| if (family->style() == s) { |
| return sk_ref_sp(family); |
| } |
| |
| sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return sk_sp<SkTypeface>(fm->matchFaceStyle(family, SkFontStyle::FromOldStyle(s))); |
| } |
| |
| sk_sp<SkTypeface> SkTypeface::MakeFromStream(SkStreamAsset* stream, int index) { |
| sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return sk_sp<SkTypeface>(fm->createFromStream(stream, index)); |
| } |
| |
| sk_sp<SkTypeface> SkTypeface::MakeFromFontData(std::unique_ptr<SkFontData> data) { |
| sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return sk_sp<SkTypeface>(fm->createFromFontData(std::move(data))); |
| } |
| |
| sk_sp<SkTypeface> SkTypeface::MakeFromFile(const char path[], int index) { |
| sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault()); |
| return sk_sp<SkTypeface>(fm->createFromFile(path, index)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkTypeface::serialize(SkWStream* wstream) const { |
| if (gSerializeTypefaceDelegate) { |
| (*gSerializeTypefaceDelegate)(this, wstream); |
| return; |
| } |
| bool isLocal = false; |
| SkFontDescriptor desc; |
| this->onGetFontDescriptor(&desc, &isLocal); |
| |
| // Embed font data if it's a local font. |
| if (isLocal && !desc.hasFontData()) { |
| desc.setFontData(this->onMakeFontData()); |
| } |
| desc.serialize(wstream); |
| } |
| |
| sk_sp<SkTypeface> SkTypeface::MakeDeserialize(SkStream* stream) { |
| if (gDeserializeTypefaceDelegate) { |
| return (*gDeserializeTypefaceDelegate)(stream); |
| } |
| |
| SkFontDescriptor desc; |
| if (!SkFontDescriptor::Deserialize(stream, &desc)) { |
| return nullptr; |
| } |
| |
| std::unique_ptr<SkFontData> data = desc.detachFontData(); |
| if (data) { |
| sk_sp<SkTypeface> typeface(SkTypeface::MakeFromFontData(std::move(data))); |
| if (typeface) { |
| return typeface; |
| } |
| } |
| |
| return SkTypeface::MakeFromName(desc.getFamilyName(), desc.getStyle()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| int SkTypeface::getVariationDesignPosition( |
| SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const |
| { |
| return this->onGetVariationDesignPosition(coordinates, coordinateCount); |
| } |
| |
| 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); |
| } |
| |
| std::unique_ptr<SkFontData> SkTypeface::makeFontData() const { |
| return this->onMakeFontData(); |
| } |
| |
| // This implementation is temporary until this method can be made pure virtual. |
| std::unique_ptr<SkFontData> SkTypeface::onMakeFontData() const { |
| int index; |
| std::unique_ptr<SkStreamAsset> stream(this->onOpenStream(&index)); |
| return skstd::make_unique<SkFontData>(std::move(stream), 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); |
| } |
| |
| std::unique_ptr<SkAdvancedTypefaceMetrics> SkTypeface::getAdvancedMetrics() const { |
| std::unique_ptr<SkAdvancedTypefaceMetrics> result = this->onGetAdvancedMetrics(); |
| if (result && result->fType == SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| SkOTTableOS2::Version::V2::Type::Field fsType; |
| constexpr SkFontTableTag os2Tag = SkTEndian_SwapBE32(SkOTTableOS2::TAG); |
| constexpr size_t fsTypeOffset = offsetof(SkOTTableOS2::Version::V2, fsType); |
| if (this->getTableData(os2Tag, fsTypeOffset, sizeof(fsType), &fsType) == sizeof(fsType)) { |
| if (fsType.Bitmap || (fsType.Restricted && !(fsType.PreviewPrint || fsType.Editable))) { |
| result->fFlags |= SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag; |
| } |
| if (fsType.NoSubsetting) { |
| 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 { |
| fBoundsOnce([this] { |
| if (!this->onComputeBounds(&fBounds)) { |
| fBounds.setEmpty(); |
| } |
| }); |
| return fBounds; |
| } |
| |
| 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(sk_ref_sp(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); |
| |
| SkScalerContextEffects noeffects; |
| std::unique_ptr<SkScalerContext> ctx = this->createScalerContext(noeffects, desc, true); |
| if (!ctx) { |
| return false; |
| } |
| |
| SkPaint::FontMetrics fm; |
| ctx->getFontMetrics(&fm); |
| bounds->set(fm.fXMin * invTextSize, fm.fTop * invTextSize, |
| fm.fXMax * invTextSize, fm.fBottom * invTextSize); |
| return true; |
| } |
| |
| std::unique_ptr<SkAdvancedTypefaceMetrics> SkTypeface::onGetAdvancedMetrics() const { |
| SkDEBUGFAIL("Typefaces that need to work with PDF backend must override this."); |
| return nullptr; |
| } |
