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/*
* 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 "include/core/SkFontMetrics.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkStream.h"
#include "include/core/SkTypeface.h"
#include "include/private/base/SkMutex.h"
#include "include/private/base/SkOnce.h"
#include "include/utils/SkCustomTypeface.h"
#include "src/core/SkAdvancedTypefaceMetrics.h"
#include "src/core/SkEndian.h"
#include "src/core/SkFontDescriptor.h"
#include "src/core/SkFontPriv.h"
#include "src/core/SkScalerContext.h"
#include "src/core/SkSurfacePriv.h"
#include "src/core/SkTypefaceCache.h"
#include "src/sfnt/SkOTTable_OS_2.h"
#include "src/utils/SkUTF.h"
SkTypeface::SkTypeface(const SkFontStyle& style, bool isFixedPitch)
: fUniqueID(SkTypefaceCache::NewTypefaceID()), fStyle(style), fIsFixedPitch(isFixedPitch) { }
SkTypeface::~SkTypeface() { }
///////////////////////////////////////////////////////////////////////////////
namespace {
class SkEmptyTypeface : public SkTypeface {
public:
static sk_sp<SkTypeface> Make() { return sk_sp<SkTypeface>(new SkEmptyTypeface); }
protected:
SkEmptyTypeface() : SkTypeface(SkFontStyle(), true) { }
std::unique_ptr<SkStreamAsset> onOpenStream(int* ttcIndex) const override { return nullptr; }
sk_sp<SkTypeface> onMakeClone(const SkFontArguments& args) const override {
return sk_ref_sp(this);
}
std::unique_ptr<SkScalerContext> onCreateScalerContext(
const SkScalerContextEffects& effects, const SkDescriptor* desc) const override
{
return SkScalerContext::MakeEmpty(
sk_ref_sp(const_cast<SkEmptyTypeface*>(this)), effects, desc);
}
void onFilterRec(SkScalerContextRec*) const override { }
std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override {
return nullptr;
}
void onGetFontDescriptor(SkFontDescriptor*, bool*) const override { }
void onCharsToGlyphs(const SkUnichar* chars, int count, SkGlyphID glyphs[]) const override {
sk_bzero(glyphs, count * sizeof(glyphs[0]));
}
int onCountGlyphs() const override { return 0; }
void getPostScriptGlyphNames(SkString*) const override {}
void getGlyphToUnicodeMap(SkUnichar*) const override {}
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();
}
bool onGetPostScriptName(SkString*) const override {
return false;
}
SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override {
return new EmptyLocalizedStrings;
}
bool onGlyphMaskNeedsCurrentColor() const override {
return false;
}
int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
int coordinateCount) const override
{
return 0;
}
int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],
int parameterCount) 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;
}
};
} // namespace
SkFontStyle SkTypeface::FromOldStyle(Style oldStyle) {
return SkFontStyle((oldStyle & SkTypeface::kBold) ? SkFontStyle::kBold_Weight
: SkFontStyle::kNormal_Weight,
SkFontStyle::kNormal_Width,
(oldStyle & SkTypeface::kItalic) ? SkFontStyle::kItalic_Slant
: SkFontStyle::kUpright_Slant);
}
SkTypeface* SkTypeface::GetDefaultTypeface(Style style) {
static SkOnce once[4];
static sk_sp<SkTypeface> defaults[4];
SkASSERT((int)style < 4);
once[style]([style] {
sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
auto t = fm->legacyMakeTypeface(nullptr, FromOldStyle(style));
defaults[style] = t ? t : SkEmptyTypeface::Make();
});
return defaults[style].get();
}
sk_sp<SkTypeface> SkTypeface::MakeDefault() {
return sk_ref_sp(GetDefaultTypeface());
}
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 (nullptr == name && (fontStyle.slant() == SkFontStyle::kItalic_Slant ||
fontStyle.slant() == SkFontStyle::kUpright_Slant) &&
(fontStyle.weight() == SkFontStyle::kBold_Weight ||
fontStyle.weight() == SkFontStyle::kNormal_Weight)) {
return sk_ref_sp(GetDefaultTypeface(static_cast<SkTypeface::Style>(
(fontStyle.slant() == SkFontStyle::kItalic_Slant ? SkTypeface::kItalic :
SkTypeface::kNormal) |
(fontStyle.weight() == SkFontStyle::kBold_Weight ? SkTypeface::kBold :
SkTypeface::kNormal))));
}
return SkFontMgr::RefDefault()->legacyMakeTypeface(name, fontStyle);
}
sk_sp<SkTypeface> SkTypeface::MakeFromStream(std::unique_ptr<SkStreamAsset> stream, int index) {
if (!stream) {
return nullptr;
}
return SkFontMgr::RefDefault()->makeFromStream(std::move(stream), index);
}
sk_sp<SkTypeface> SkTypeface::MakeFromData(sk_sp<SkData> data, int index) {
if (!data) {
return nullptr;
}
return SkFontMgr::RefDefault()->makeFromData(std::move(data), index);
}
sk_sp<SkTypeface> SkTypeface::MakeFromFile(const char path[], int index) {
return SkFontMgr::RefDefault()->makeFromFile(path, index);
}
sk_sp<SkTypeface> SkTypeface::makeClone(const SkFontArguments& args) const {
return this->onMakeClone(args);
}
///////////////////////////////////////////////////////////////////////////////
void SkTypeface::serialize(SkWStream* wstream, SerializeBehavior behavior) const {
bool isLocalData = false;
SkFontDescriptor desc;
this->onGetFontDescriptor(&desc, &isLocalData);
bool shouldSerializeData = false;
switch (behavior) {
case SerializeBehavior::kDoIncludeData: shouldSerializeData = true; break;
case SerializeBehavior::kDontIncludeData: shouldSerializeData = false; break;
case SerializeBehavior::kIncludeDataIfLocal: shouldSerializeData = isLocalData; break;
}
if (shouldSerializeData) {
int index;
desc.setStream(this->openStream(&index));
if (desc.hasStream()) {
desc.setCollectionIndex(index);
}
int numAxes = this->getVariationDesignPosition(nullptr, 0);
if (0 < numAxes) {
numAxes = this->getVariationDesignPosition(desc.setVariationCoordinates(numAxes), numAxes);
if (numAxes <= 0) {
desc.setVariationCoordinates(0);
}
}
}
desc.serialize(wstream);
}
sk_sp<SkData> SkTypeface::serialize(SerializeBehavior behavior) const {
SkDynamicMemoryWStream stream;
this->serialize(&stream, behavior);
return stream.detachAsData();
}
sk_sp<SkTypeface> SkTypeface::MakeDeserialize(SkStream* stream) {
SkFontDescriptor desc;
if (!SkFontDescriptor::Deserialize(stream, &desc)) {
return nullptr;
}
if (desc.hasStream()) {
if (auto tf = SkCustomTypefaceBuilder::Deserialize(desc.dupStream().get())) {
return tf;
}
}
if (desc.hasStream()) {
SkFontArguments args;
args.setCollectionIndex(desc.getCollectionIndex());
args.setVariationDesignPosition({desc.getVariation(), desc.getVariationCoordinateCount()});
args.setPalette({desc.getPaletteIndex(),
desc.getPaletteEntryOverrides(),
desc.getPaletteEntryOverrideCount()});
sk_sp<SkFontMgr> defaultFm = SkFontMgr::RefDefault();
sk_sp<SkTypeface> typeface = defaultFm->makeFromStream(desc.detachStream(), args);
if (typeface) {
return typeface;
}
}
return SkTypeface::MakeFromName(desc.getFamilyName(), desc.getStyle());
}
///////////////////////////////////////////////////////////////////////////////
bool SkTypeface::glyphMaskNeedsCurrentColor() const {
return this->onGlyphMaskNeedsCurrentColor();
}
int SkTypeface::getVariationDesignPosition(
SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const
{
return this->onGetVariationDesignPosition(coordinates, coordinateCount);
}
int SkTypeface::getVariationDesignParameters(
SkFontParameters::Variation::Axis parameters[], int parameterCount) const
{
return this->onGetVariationDesignParameters(parameters, parameterCount);
}
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);
}
sk_sp<SkData> SkTypeface::copyTableData(SkFontTableTag tag) const {
return this->onCopyTableData(tag);
}
sk_sp<SkData> SkTypeface::onCopyTableData(SkFontTableTag tag) const {
size_t size = this->getTableSize(tag);
if (size) {
sk_sp<SkData> data = SkData::MakeUninitialized(size);
(void)this->getTableData(tag, 0, size, data->writable_data());
return data;
}
return nullptr;
}
std::unique_ptr<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<SkStreamAsset> SkTypeface::openExistingStream(int* ttcIndex) const {
int ttcIndexStorage;
if (nullptr == ttcIndex) {
// So our subclasses don't need to check for null param
ttcIndex = &ttcIndexStorage;
}
return this->onOpenExistingStream(ttcIndex);
}
std::unique_ptr<SkScalerContext> SkTypeface::createScalerContext(
const SkScalerContextEffects& effects, const SkDescriptor* desc) const {
std::unique_ptr<SkScalerContext> scalerContext = this->onCreateScalerContext(effects, desc);
SkASSERT(scalerContext);
return scalerContext;
}
void SkTypeface::unicharsToGlyphs(const SkUnichar uni[], int count, SkGlyphID glyphs[]) const {
if (count > 0 && glyphs && uni) {
this->onCharsToGlyphs(uni, count, glyphs);
}
}
SkGlyphID SkTypeface::unicharToGlyph(SkUnichar uni) const {
SkGlyphID glyphs[1] = { 0 };
this->onCharsToGlyphs(&uni, 1, glyphs);
return glyphs[0];
}
namespace {
class SkConvertToUTF32 {
public:
SkConvertToUTF32() {}
const SkUnichar* convert(const void* text, size_t byteLength, SkTextEncoding encoding) {
const SkUnichar* uni;
switch (encoding) {
case SkTextEncoding::kUTF8: {
uni = fStorage.reset(byteLength);
const char* ptr = (const char*)text;
const char* end = ptr + byteLength;
for (int i = 0; ptr < end; ++i) {
fStorage[i] = SkUTF::NextUTF8(&ptr, end);
}
} break;
case SkTextEncoding::kUTF16: {
uni = fStorage.reset(byteLength);
const uint16_t* ptr = (const uint16_t*)text;
const uint16_t* end = ptr + (byteLength >> 1);
for (int i = 0; ptr < end; ++i) {
fStorage[i] = SkUTF::NextUTF16(&ptr, end);
}
} break;
case SkTextEncoding::kUTF32:
uni = (const SkUnichar*)text;
break;
default:
SK_ABORT("unexpected enum");
}
return uni;
}
private:
SkAutoSTMalloc<256, SkUnichar> fStorage;
};
}
int SkTypeface::textToGlyphs(const void* text, size_t byteLength, SkTextEncoding encoding,
SkGlyphID glyphs[], int maxGlyphCount) const {
if (0 == byteLength) {
return 0;
}
SkASSERT(text);
int count = SkFontPriv::CountTextElements(text, byteLength, encoding);
if (!glyphs || count > maxGlyphCount) {
return count;
}
if (encoding == SkTextEncoding::kGlyphID) {
memcpy(glyphs, text, count << 1);
return count;
}
SkConvertToUTF32 storage;
const SkUnichar* uni = storage.convert(text, byteLength, encoding);
this->unicharsToGlyphs(uni, count, glyphs);
return count;
}
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);
}
bool SkTypeface::getPostScriptName(SkString* name) const {
return this->onGetPostScriptName(name);
}
void SkTypeface::getGlyphToUnicodeMap(SkUnichar* dst) const {
sk_bzero(dst, sizeof(SkUnichar) * this->countGlyphs());
}
std::unique_ptr<SkAdvancedTypefaceMetrics> SkTypeface::getAdvancedMetrics() const {
std::unique_ptr<SkAdvancedTypefaceMetrics> result = this->onGetAdvancedMetrics();
if (result && result->fPostScriptName.isEmpty()) {
result->fPostScriptName = result->fFontName;
}
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;
}
std::unique_ptr<SkStreamAsset> SkTypeface::onOpenExistingStream(int* ttcIndex) const {
return this->onOpenStream(ttcIndex);
}
///////////////////////////////////////////////////////////////////////////////
#include "include/core/SkPaint.h"
#include "src/core/SkDescriptor.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;
SkFont font;
font.setTypeface(sk_ref_sp(const_cast<SkTypeface*>(this)));
font.setSize(textSize);
font.setLinearMetrics(true);
SkScalerContextRec rec;
SkScalerContextEffects effects;
SkScalerContext::MakeRecAndEffectsFromFont(font, &rec, &effects);
SkAutoDescriptor ad;
SkScalerContextEffects noeffects;
SkScalerContext::AutoDescriptorGivenRecAndEffects(rec, noeffects, &ad);
std::unique_ptr<SkScalerContext> ctx = this->createScalerContext(noeffects, ad.getDesc());
SkFontMetrics fm;
ctx->getFontMetrics(&fm);
if (!fm.hasBounds()) {
return false;
}
bounds->setLTRB(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;
}