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 "third_party/skia/include/core/SkCanvas.h"
   8 #include "third_party/skia/include/core/SkDevice.h"
   9 #include "third_party/skia/include/core/SkMetaData.h"
  10
  11 namespace printing {
  12
  13 namespace {
  14
  15 const char* kMetafileKey = "CrMetafile";
  16 const char* kCustomScaleKey = "CrCustomScale";
  17
  18 }  // namespace
  19
  20 // static
  21 void MetafileSkiaWrapper::SetMetafileOnCanvas(const SkCanvas& canvas,
  22                                               Metafile* metafile) {
  23   MetafileSkiaWrapper* wrapper = NULL;
  24   if (metafile)
  25     wrapper = new MetafileSkiaWrapper(metafile);
  26
  27   SkMetaData& meta = skia::getMetaData(canvas);
  28   meta.setRefCnt(kMetafileKey, wrapper);
  29   SkSafeUnref(wrapper);
  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