src/third_party/skia/src/core/SkFontDescriptor.cpp

   1 /*
   2  * Copyright 2012 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkFontDescriptor.h"
   9 #include "SkStream.h"
  10
  11 enum {
  12     // these must match the sfnt 'name' enums
  13     kFontFamilyName = 0x01,
  14     kFullName       = 0x04,
  15     kPostscriptName = 0x06,
  16
  17     // These count backwards from 0xFF, so as not to collide with the SFNT
  18     // defines for names in its 'name' table.
  19     kFontFileName   = 0xFE,
  20     kSentinel       = 0xFF,
  21 };
  22
  23 SkFontDescriptor::SkFontDescriptor(SkTypeface::Style style) {
  24     fStyle = style;
  25 }
  26
  27 static void read_string(SkStream* stream, SkString* string) {
  28     const uint32_t length = SkToU32(stream->readPackedUInt());
  29     if (length > 0) {
  30         string->resize(length);
  31         stream->read(string->writable_str(), length);
  32     }
  33 }
  34
  35 static void write_string(SkWStream* stream, const SkString& string,
  36                          uint32_t id) {
  37     if (!string.isEmpty()) {
  38         stream->writePackedUInt(id);
  39         stream->writePackedUInt(string.size());
  40         stream->write(string.c_str(), string.size());
  41     }
  42 }
  43
  44 SkFontDescriptor::SkFontDescriptor(SkStream* stream) {
  45     fStyle = (SkTypeface::Style)stream->readPackedUInt();
  46
  47     for (;;) {
  48         switch (stream->readPackedUInt()) {
  49             case kFontFamilyName:
  50                 read_string(stream, &fFamilyName);
  51                 break;
  52             case kFullName:
  53                 read_string(stream, &fFullName);
  54                 break;
  55             case kPostscriptName:
  56                 read_string(stream, &fPostscriptName);
  57                 break;
  58             case kFontFileName:
  59                 read_string(stream, &fFontFileName);
  60                 break;
  61             case kSentinel:
  62                 return;
  63             default:
  64                 SkDEBUGFAIL("Unknown id used by a font descriptor");
  65                 return;
  66         }
  67     }
  68 }
  69
  70 void SkFontDescriptor::serialize(SkWStream* stream) {
  71     stream->writePackedUInt(fStyle);
  72
  73     write_string(stream, fFamilyName, kFontFamilyName);
  74     write_string(stream, fFullName, kFullName);
  75     write_string(stream, fPostscriptName, kPostscriptName);
  76     write_string(stream, fFontFileName, kFontFileName);
  77
  78     stream->writePackedUInt(kSentinel);
  79 }