printing/metafile_skia_wrapper.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "printing/metafile_skia_wrapper.h"
   6 #include "skia/ext/platform_device.h"
   7 #include "skia/ext/refptr.h"
   8 #include "third_party/skia/include/core/SkCanvas.h"
   9 #include "third_party/skia/include/core/SkDevice.h"
  10 #include "third_party/skia/include/core/SkMetaData.h"
  11
  12 namespace printing {
  13
  14 namespace {
  15
  16 const char* kMetafileKey = "CrMetafile";
  17 const char* kCustomScaleKey = "CrCustomScale";
  18
  19 }  // namespace
  20
  21 // static
  22 void MetafileSkiaWrapper::SetMetafileOnCanvas(const SkCanvas& canvas,
  23                                               PdfMetafileSkia* metafile) {
  24   skia::RefPtr<MetafileSkiaWrapper> wrapper;
  25   if (metafile)
  26     wrapper = skia::AdoptRef(new MetafileSkiaWrapper(metafile));
  27
  28   SkMetaData& meta = skia::getMetaData(canvas);
  29   meta.setRefCnt(kMetafileKey, wrapper.get());
  30 }
  31
  32 // static
  33 PdfMetafileSkia* MetafileSkiaWrapper::GetMetafileFromCanvas(
  34     const SkCanvas& canvas) {
  35   SkMetaData& meta = skia::getMetaData(canvas);
  36   SkRefCnt* value;
  37   if (!meta.findRefCnt(kMetafileKey, &value) || !value)
  38     return NULL;
  39
  40   return static_cast<MetafileSkiaWrapper*>(value)->metafile_;
  41 }
  42
  43 // static
  44 void MetafileSkiaWrapper::SetCustomScaleOnCanvas(const SkCanvas& canvas,
  45                                                  double scale) {
  46   SkMetaData& meta = skia::getMetaData(canvas);
  47   meta.setScalar(kCustomScaleKey, SkFloatToScalar(scale));
  48 }
  49
  50 // static
  51 bool MetafileSkiaWrapper::GetCustomScaleOnCanvas(const SkCanvas& canvas,
  52                                                  double* scale) {
  53   SkMetaData& meta = skia::getMetaData(canvas);
  54   SkScalar value;
  55   if (!meta.findScalar(kCustomScaleKey, &value))
  56     return false;
  57
  58   *scale = SkScalarToFloat(value);
  59   return true;
  60 }
  61
  62 MetafileSkiaWrapper::MetafileSkiaWrapper(PdfMetafileSkia* metafile)
  63     : metafile_(metafile) {
  64 }
  65
  66 }  // namespace printing