A better fix for scaling issue.

printing/metafile_skia_wrapper.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "printing/metafile_skia_wrapper.h"
 #include "skia/ext/platform_device.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkDevice.h"
 #include "third_party/skia/include/core/SkMetaData.h"
 
 namespace printing {
 
 namespace {
 
 const char* kMetafileKey = "CrMetafile";
+const char* kCustomScaleKey = "CrCustomScale";
 
 }  // namespace
 
 // static
 void MetafileSkiaWrapper::SetMetafileOnCanvas(const SkCanvas& canvas,
                                               Metafile* metafile) {
   MetafileSkiaWrapper* wrapper = NULL;
   if (metafile)
     wrapper = new MetafileSkiaWrapper(metafile);
 
   SkMetaData& meta = skia::getMetaData(canvas);
   meta.setRefCnt(kMetafileKey, wrapper);
   SkSafeUnref(wrapper);
 }
 
 // static
 Metafile* MetafileSkiaWrapper::GetMetafileFromCanvas(const SkCanvas& canvas) {
   SkMetaData& meta = skia::getMetaData(canvas);
   SkRefCnt* value;
   if (!meta.findRefCnt(kMetafileKey, &value) || !value)
     return NULL;
 
   return static_cast<MetafileSkiaWrapper*>(value)->metafile_;
 }
 
+// static
+void MetafileSkiaWrapper::SetCustomScaleOnCanvas(const SkCanvas& canvas,
+                                                 double scale) {
+  SkMetaData& meta = skia::getMetaData(canvas);
+  meta.setScalar(kCustomScaleKey, SkFloatToScalar(scale));
+}
+
+// static
+bool MetafileSkiaWrapper::GetCustomScaleOnCanvas(const SkCanvas& canvas,
+                                                 double* scale) {
+  SkMetaData& meta = skia::getMetaData(canvas);
+  SkScalar value;
+  if (!meta.findScalar(kCustomScaleKey, &value))
+    return false;
+
+  *scale = SkScalarToFloat(value);
+  return true;
+}
+
 MetafileSkiaWrapper::MetafileSkiaWrapper(Metafile* metafile)
     : metafile_(metafile) {
 }
 
 }  // namespace printing