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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 "SkFontDescriptor.h"
#include "SkMakeUnique.h"
#include "SkStream.h"
#include "SkData.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) {
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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