| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkData.h" |
| #include "include/core/SkStream.h" |
| #include "src/core/SkFontDescriptor.h" |
| #include "src/core/SkMakeUnique.h" |
| |
| enum { |
| kInvalid = 0x00, |
| |
| // these must match the sfnt 'name' enums |
| kFontFamilyName = 0x01, |
| kFullName = 0x04, |
| kPostscriptName = 0x06, |
| |
| // These count backwards from 0xFF, so as not to collide with the SFNT |
| // defines for names in its 'name' table. |
| kFontAxes = 0xFB, |
| kFontAxes_bad = 0xFC, // Broken negative axes, remove when MIN_PICTURE_VERSION > 62. |
| kFontIndex = 0xFD, |
| kSentinel = 0xFF, |
| }; |
| |
| SkFontDescriptor::SkFontDescriptor() { } |
| |
| static bool SK_WARN_UNUSED_RESULT read_string(SkStream* stream, SkString* string) { |
| size_t length; |
| if (!stream->readPackedUInt(&length)) { return false; } |
| if (length > 0) { |
| string->resize(length); |
| if (stream->read(string->writable_str(), length) != length) { return false; } |
| } |
| return true; |
| } |
| |
| static bool write_string(SkWStream* stream, const SkString& string, uint32_t id) { |
| if (string.isEmpty()) { return true; } |
| return stream->writePackedUInt(id) && |
| stream->writePackedUInt(string.size()) && |
| stream->write(string.c_str(), string.size()); |
| } |
| |
| static bool write_uint(SkWStream* stream, size_t n, uint32_t id) { |
| return stream->writePackedUInt(id) && |
| stream->writePackedUInt(n); |
| } |
| |
| static size_t SK_WARN_UNUSED_RESULT read_id(SkStream* stream) { |
| size_t i; |
| if (!stream->readPackedUInt(&i)) { return kInvalid; } |
| return i; |
| } |
| |
| bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) { |
| size_t styleBits; |
| if (!stream->readPackedUInt(&styleBits)) { return false; } |
| result->fStyle = SkFontStyle((styleBits >> 16) & 0xFFFF, |
| (styleBits >> 8 ) & 0xFF, |
| static_cast<SkFontStyle::Slant>(styleBits & 0xFF)); |
| |
| SkAutoSTMalloc<4, SkFixed> axis; |
| size_t axisCount = 0; |
| size_t index = 0; |
| for (size_t id; (id = read_id(stream)) != kSentinel;) { |
| switch (id) { |
| case kFontFamilyName: |
| if (!read_string(stream, &result->fFamilyName)) { return false; } |
| break; |
| case kFullName: |
| if (!read_string(stream, &result->fFullName)) { return false; } |
| break; |
| case kPostscriptName: |
| if (!read_string(stream, &result->fPostscriptName)) { return false; } |
| break; |
| case kFontAxes: |
| if (!stream->readPackedUInt(&axisCount)) { return false; } |
| axis.reset(axisCount); |
| for (size_t i = 0; i < axisCount; ++i) { |
| if (!stream->readS32(&axis[i])) { return false; } |
| } |
| break; |
| case kFontAxes_bad: |
| if (!stream->readPackedUInt(&axisCount)) { return false; } |
| axis.reset(axisCount); |
| for (size_t i = 0; i < axisCount; ++i) { |
| size_t packedAxis; |
| if (!stream->readPackedUInt(&packedAxis)) { return false; } |
| axis[i] = packedAxis; |
| } |
| break; |
| case kFontIndex: |
| if (!stream->readPackedUInt(&index)) { return false; } |
| break; |
| default: |
| SkDEBUGFAIL("Unknown id used by a font descriptor"); |
| return false; |
| } |
| } |
| |
| size_t length; |
| if (!stream->readPackedUInt(&length)) { return false; } |
| if (length > 0) { |
| sk_sp<SkData> data(SkData::MakeUninitialized(length)); |
| if (stream->read(data->writable_data(), length) != length) { |
| SkDEBUGFAIL("Could not read font data"); |
| return false; |
| } |
| result->fFontData = skstd::make_unique<SkFontData>( |
| SkMemoryStream::Make(std::move(data)), index, axis, axisCount); |
| } |
| return true; |
| } |
| |
| void SkFontDescriptor::serialize(SkWStream* stream) const { |
| uint32_t styleBits = (fStyle.weight() << 16) | (fStyle.width() << 8) | (fStyle.slant()); |
| stream->writePackedUInt(styleBits); |
| |
| write_string(stream, fFamilyName, kFontFamilyName); |
| write_string(stream, fFullName, kFullName); |
| write_string(stream, fPostscriptName, kPostscriptName); |
| if (fFontData.get()) { |
| if (fFontData->getIndex()) { |
| write_uint(stream, fFontData->getIndex(), kFontIndex); |
| } |
| if (fFontData->getAxisCount()) { |
| write_uint(stream, fFontData->getAxisCount(), kFontAxes); |
| for (int i = 0; i < fFontData->getAxisCount(); ++i) { |
| stream->write32(fFontData->getAxis()[i]); |
| } |
| } |
| } |
| |
| stream->writePackedUInt(kSentinel); |
| |
| if (fFontData.get() && fFontData->hasStream()) { |
| std::unique_ptr<SkStreamAsset> fontStream = fFontData->detachStream(); |
| size_t length = fontStream->getLength(); |
| stream->writePackedUInt(length); |
| stream->writeStream(fontStream.get(), length); |
| } else { |
| stream->writePackedUInt(0); |
| } |
| } |