Optionally clear PlatformCanvas instances.

skia/ext/vector_platform_device_emf_win.cc

 // Copyright (c) 2012 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 <windows.h>
 
 #include "skia/ext/vector_platform_device_emf_win.h"
 
 #include "skia/ext/bitmap_platform_device.h"
 #include "skia/ext/skia_utils_win.h"
 #include "third_party/skia/include/core/SkTemplates.h"
 #include "third_party/skia/include/core/SkUtils.h"
 #include "third_party/skia/include/ports/SkTypeface_win.h"
 
 namespace skia {
 
 // static
 SkDevice* VectorPlatformDeviceEmf::CreateDevice(
-    int width, int height, bool is_opaque, HANDLE shared_section) {
-  if (!is_opaque) {
+    int width, int height, int flags, HANDLE shared_section) {
+  if (!flags & FLAGS_OPAQUE) {
     // TODO(maruel):  http://crbug.com/18382 When restoring a semi-transparent
     // layer, i.e. merging it, we need to rasterize it because GDI doesn't
     // support transparency except for AlphaBlend(). Right now, a
     // BitmapPlatformDevice is created when VectorCanvas think a saveLayers()
     // call is being done. The way to save a layer would be to create an
     // EMF-based VectorDevice and have this device registers the drawing. When
     // playing back the device into a bitmap, do it at the printer's dpi instead
     // of the layout's dpi (which is much lower).
-    return BitmapPlatformDevice::create(width, height, is_opaque,
-                                        shared_section);
+    return BitmapPlatformDevice::create(width, height, flags, shared_section);
   }
 
   // TODO(maruel):  http://crbug.com/18383 Look if it would be worth to
   // increase the resolution by ~10x (any worthy factor) to increase the
   // rendering precision (think about printing) while using a relatively
   // low dpi. This happens because we receive float as input but the GDI
   // functions works with integers. The idea is to premultiply the matrix
   // with this factor and multiply each SkScalar that are passed to
   // SkScalarRound(value) as SkScalarRound(value * 10). Safari is already
   // doing the same for text rendering.
@@ skipping 821 matching lines @@
                                 pixels,
                                 reinterpret_cast<const BITMAPINFO*>(&hdr),
                                 DIB_RGB_COLORS,
                                 SRCCOPY);
   }
   EndPlatformPaint();
   Cleanup();
 }
 
 }  // namespace skia