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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 {
// 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 = 0xFC,
kFontIndex = 0xFD,
kFontFileName = 0xFE, // Remove when MIN_PICTURE_VERSION > 41
kSentinel = 0xFF,
};
SkFontDescriptor::SkFontDescriptor() { }
static void read_string(SkStream* stream, SkString* string) {
const uint32_t length = SkToU32(stream->readPackedUInt());
if (length > 0) {
string->resize(length);
stream->read(string->writable_str(), length);
}
}
// Remove when MIN_PICTURE_VERSION > 41
static void skip_string(SkStream* stream) {
const uint32_t length = SkToU32(stream->readPackedUInt());
if (length > 0) {
stream->skip(length);
}
}
static void write_string(SkWStream* stream, const SkString& string, uint32_t id) {
if (!string.isEmpty()) {
stream->writePackedUInt(id);
stream->writePackedUInt(string.size());
stream->write(string.c_str(), string.size());
}
}
static size_t read_uint(SkStream* stream) {
return stream->readPackedUInt();
}
static void write_uint(SkWStream* stream, size_t n, uint32_t id) {
stream->writePackedUInt(id);
stream->writePackedUInt(n);
}
bool SkFontDescriptor::Deserialize(SkStream* stream, SkFontDescriptor* result) {
size_t styleBits = stream->readPackedUInt();
if (styleBits <= 2) {
// Remove this branch when MIN_PICTURE_VERSION > 45
result->fStyle = SkFontStyle::FromOldStyle(styleBits);
} else {
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 = stream->readPackedUInt()) != kSentinel;) {
switch (id) {
case kFontFamilyName:
read_string(stream, &result->fFamilyName);
break;
case kFullName:
read_string(stream, &result->fFullName);
break;
case kPostscriptName:
read_string(stream, &result->fPostscriptName);
break;
case kFontAxes:
axisCount = read_uint(stream);
axis.reset(axisCount);
for (size_t i = 0; i < axisCount; ++i) {
axis[i] = read_uint(stream);
}
break;
case kFontIndex:
index = read_uint(stream);
break;
case kFontFileName: // Remove when MIN_PICTURE_VERSION > 41
skip_string(stream);
break;
default:
SkDEBUGFAIL("Unknown id used by a font descriptor");
return false;
}
}
size_t length = stream->readPackedUInt();
if (length > 0) {
sk_sp<SkData> data(SkData::MakeUninitialized(length));
if (stream->read(data->writable_data(), length) == length) {
result->fFontData = skstd::make_unique<SkFontData>(
skstd::make_unique<SkMemoryStream>(data), index, axis, axisCount);
} else {
SkDEBUGFAIL("Could not read font data");
return false;
}
}
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->writePackedUInt(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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