michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "SkFontDescriptor.h"
michael@0: #include "SkStream.h"
michael@0: 
michael@0: enum {
michael@0:     // these must match the sfnt 'name' enums
michael@0:     kFontFamilyName = 0x01,
michael@0:     kFullName       = 0x04,
michael@0:     kPostscriptName = 0x06,
michael@0: 
michael@0:     // These count backwards from 0xFF, so as not to collide with the SFNT
michael@0:     // defines for names in its 'name' table.
michael@0:     kFontFileName   = 0xFE,
michael@0:     kSentinel       = 0xFF,
michael@0: };
michael@0: 
michael@0: SkFontDescriptor::SkFontDescriptor(SkTypeface::Style style) {
michael@0:     fStyle = style;
michael@0: }
michael@0: 
michael@0: static void read_string(SkStream* stream, SkString* string) {
michael@0:     const uint32_t length = SkToU32(stream->readPackedUInt());
michael@0:     if (length > 0) {
michael@0:         string->resize(length);
michael@0:         stream->read(string->writable_str(), length);
michael@0:     }
michael@0: }
michael@0: 
michael@0: static void write_string(SkWStream* stream, const SkString& string,
michael@0:                          uint32_t id) {
michael@0:     if (!string.isEmpty()) {
michael@0:         stream->writePackedUInt(id);
michael@0:         stream->writePackedUInt(string.size());
michael@0:         stream->write(string.c_str(), string.size());
michael@0:     }
michael@0: }
michael@0: 
michael@0: SkFontDescriptor::SkFontDescriptor(SkStream* stream) {
michael@0:     fStyle = (SkTypeface::Style)stream->readPackedUInt();
michael@0: 
michael@0:     for (;;) {
michael@0:         switch (stream->readPackedUInt()) {
michael@0:             case kFontFamilyName:
michael@0:                 read_string(stream, &fFamilyName);
michael@0:                 break;
michael@0:             case kFullName:
michael@0:                 read_string(stream, &fFullName);
michael@0:                 break;
michael@0:             case kPostscriptName:
michael@0:                 read_string(stream, &fPostscriptName);
michael@0:                 break;
michael@0:             case kFontFileName:
michael@0:                 read_string(stream, &fFontFileName);
michael@0:                 break;
michael@0:             case kSentinel:
michael@0:                 return;
michael@0:             default:
michael@0:                 SkDEBUGFAIL("Unknown id used by a font descriptor");
michael@0:                 return;
michael@0:         }
michael@0:     }
michael@0: }
michael@0: 
michael@0: void SkFontDescriptor::serialize(SkWStream* stream) {
michael@0:     stream->writePackedUInt(fStyle);
michael@0: 
michael@0:     write_string(stream, fFamilyName, kFontFamilyName);
michael@0:     write_string(stream, fFullName, kFullName);
michael@0:     write_string(stream, fPostscriptName, kPostscriptName);
michael@0:     write_string(stream, fFontFileName, kFontFileName);
michael@0: 
michael@0:     stream->writePackedUInt(kSentinel);
michael@0: }