Move uncoupled code out of skia/ext/platform_device.h

skia/ext/platform_canvas.h

 // 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.
 
 #ifndef SKIA_EXT_PLATFORM_CANVAS_H_
 #define SKIA_EXT_PLATFORM_CANVAS_H_
 
 // The platform-specific device will include the necessary platform headers
 // to get the surface type.
 #include "base/basictypes.h"
-#include "skia/ext/platform_device.h"
+#include "skia/ext/platform_surface.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPixelRef.h"
 #include "third_party/skia/include/core/SkPixmap.h"
 
+class SkBaseDevice;
+
 namespace skia {
 
 typedef SkCanvas PlatformCanvas;
 
 //
 //  Note about error handling.
 //
 //  Creating a canvas can fail at times, most often because we fail to allocate
 //  the backing-store (pixels). This can be from out-of-memory, or something
 //  more opaque, like GDI or cairo reported a failure.
@@ skipping 136 matching lines @@
   PlatformSurface GetPlatformSurface() { return platform_surface_; }
  private:
   SkCanvas* canvas_;
   PlatformSurface platform_surface_;
 
   // Disallow copy and assign
   ScopedPlatformPaint(const ScopedPlatformPaint&);
   ScopedPlatformPaint& operator=(const ScopedPlatformPaint&);
 };
 
+// Following routines are used in print preview workflow to mark the
+// preview metafile.
+SK_API SkMetaData& GetMetaData(const SkCanvas& canvas);
+
+#if defined(OS_MACOSX)
+SK_API void SetIsPreviewMetafile(const SkCanvas& canvas, bool is_preview);
+SK_API bool IsPreviewMetafile(const SkCanvas& canvas);
+
+// Returns the CGContext that backing the SkCanvas.
+// Returns NULL if none is bound.
+SK_API CGContextRef GetBitmapContext(const SkCanvas& canvas);
+#endif
+
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_CANVAS_H_