/* * 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(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 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( 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 fontStream = fFontData->detachStream(); size_t length = fontStream->getLength(); stream->writePackedUInt(length); stream->writeStream(fontStream.get(), length); } else { stream->writePackedUInt(0); } }