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- /*
- * 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);
- }
- }
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