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      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                                               Metafile* 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 Metafile* MetafileSkiaWrapper::GetMetafileFromCanvas(const SkCanvas& canvas) {
     34   SkMetaData& meta = skia::getMetaData(canvas);
     35   SkRefCnt* value;
     36   if (!meta.findRefCnt(kMetafileKey, &value) || !value)
     37     return NULL;
     38 
     39   return static_cast<MetafileSkiaWrapper*>(value)->metafile_;
     40 }
     41 
     42 // static
     43 void MetafileSkiaWrapper::SetCustomScaleOnCanvas(const SkCanvas& canvas,
     44                                                  double scale) {
     45   SkMetaData& meta = skia::getMetaData(canvas);
     46   meta.setScalar(kCustomScaleKey, SkFloatToScalar(scale));
     47 }
     48 
     49 // static
     50 bool MetafileSkiaWrapper::GetCustomScaleOnCanvas(const SkCanvas& canvas,
     51                                                  double* scale) {
     52   SkMetaData& meta = skia::getMetaData(canvas);
     53   SkScalar value;
     54   if (!meta.findScalar(kCustomScaleKey, &value))
     55     return false;
     56 
     57   *scale = SkScalarToFloat(value);
     58   return true;
     59 }
     60 
     61 MetafileSkiaWrapper::MetafileSkiaWrapper(Metafile* metafile)
     62     : metafile_(metafile) {
     63 }
     64 
     65 }  // namespace printing
     66