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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 "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.
kFontIndex = 0xFD,
kFontFileName = 0xFE,
kSentinel = 0xFF,
};
SkFontDescriptor::SkFontDescriptor(SkTypeface::Style style) : fFontIndex(0), fStyle(style) { }
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);
}
}
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);
}
SkFontDescriptor::SkFontDescriptor(SkStream* stream) : fFontIndex(0) {
fStyle = (SkTypeface::Style)stream->readPackedUInt();
for (size_t id; (id = stream->readPackedUInt()) != kSentinel;) {
switch (id) {
case kFontFamilyName:
read_string(stream, &fFamilyName);
break;
case kFullName:
read_string(stream, &fFullName);
break;
case kPostscriptName:
read_string(stream, &fPostscriptName);
break;
case kFontIndex:
fFontIndex = read_uint(stream);
break;
case kFontFileName:
read_string(stream, &fFontFileName);
break;
default:
SkDEBUGFAIL("Unknown id used by a font descriptor");
return;
}
}
size_t length = stream->readPackedUInt();
if (length > 0) {
SkAutoTUnref<SkData> data(SkData::NewUninitialized(length));
if (stream->read(data->writable_data(), length) == length) {
fFontData.reset(SkNEW_ARGS(SkMemoryStream, (data)));
}
}
}
void SkFontDescriptor::serialize(SkWStream* stream) {
stream->writePackedUInt(fStyle);
write_string(stream, fFamilyName, kFontFamilyName);
write_string(stream, fFullName, kFullName);
write_string(stream, fPostscriptName, kPostscriptName);
write_string(stream, fFontFileName, kFontFileName);
if (fFontIndex) {
write_uint(stream, fFontIndex, kFontIndex);
}
stream->writePackedUInt(kSentinel);
if (fFontData) {
size_t length = fFontData->getLength();
stream->writePackedUInt(length);
stream->writeStream(fFontData, length);
} else {
stream->writePackedUInt(0);
}
}
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