Move skia extensions from the port to skia/ext for Windows only. Fixed the

include guards of the moved files, but nothing else.

Review URL: http://codereview.chromium.org/11568

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@5861 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 98 insertions, 0 deletions

diff --git a/skia/ext/platform_device_win.h b/skia/ext/platform_device_win.h
new file mode 100644
index 0000000..e01a2c5
--- /dev/null
+++ b/skia/ext/platform_device_win.h
@@ -0,0 +1,98 @@
+// Copyright (c) 2006-2008 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_DEVICE_WIN_H_
+#define SKIA_EXT_PLATFORM_DEVICE_WIN_H_
+
+#include <windows.h>
+
+#include <vector>
+
+#include "SkDevice.h"
+
+class SkMatrix;
+class SkPath;
+class SkRegion;
+
+namespace gfx {
+
+// A device is basically a wrapper around SkBitmap that provides a surface for
+// SkCanvas to draw into. Our device provides a surface Windows can also write
+// to. It also provides functionality to play well with GDI drawing functions.
+// This class is abstract and must be subclassed. It provides the basic
+// interface to implement it either with or without a bitmap backend.
+class PlatformDeviceWin : public SkDevice {
+ public:
+  // The DC that corresponds to the bitmap, used for GDI operations drawing
+  // into the bitmap. This is possibly heavyweight, so it should be existant
+  // only during one pass of rendering.
+  virtual HDC getBitmapDC() = 0;
+
+  // Draws to the given screen DC, if the bitmap DC doesn't exist, this will
+  // temporarily create it. However, if you have created the bitmap DC, it will
+  // be more efficient if you don't free it until after this call so it doesn't
+  // have to be created twice.  If src_rect is null, then the entirety of the
+  // source device will be copied.
+  virtual void drawToHDC(HDC dc, int x, int y, const RECT* src_rect) = 0;
+
+  // Invoke before using GDI functions. See description in platform_device.cc
+  // for specifics.
+  // NOTE: x,y,width and height are relative to the current transform.
+  virtual void prepareForGDI(int x, int y, int width, int height) { }
+
+  // Invoke after using GDI functions. See description in platform_device.cc
+  // for specifics.
+  // NOTE: x,y,width and height are relative to the current transform.
+  virtual void postProcessGDI(int x, int y, int width, int height) { }
+
+  // Sets the opacity of each pixel in the specified region to be opaque.
+  virtual void makeOpaque(int x, int y, int width, int height) { }
+
+  // Call this function to fix the alpha channels before compositing this layer
+  // onto another. Internally, the device uses a special alpha method to work
+  // around problems with Windows. This call will put the values into what
+  // Skia expects, so it can be composited onto other layers.
+  //
+  // After this call, no more drawing can be done because the
+  // alpha channels will be "correct", which, if this function is called again
+  // will make them wrong. See the implementation for more discussion.
+  virtual void fixupAlphaBeforeCompositing() { }
+
+  // Returns if the preferred rendering engine is vectorial or bitmap based.
+  virtual bool IsVectorial() = 0;
+
+  // Initializes the default settings and colors in a device context.
+  static void InitializeDC(HDC context);
+
+  // Loads a SkPath into the GDI context. The path can there after be used for
+  // clipping or as a stroke.
+  static void LoadPathToDC(HDC context, const SkPath& path);
+
+  // Loads a SkRegion into the GDI context.
+  static void LoadClippingRegionToDC(HDC context, const SkRegion& region,
+                                     const SkMatrix& transformation);
+
+ protected:
+  // Arrays must be inside structures.
+  struct CubicPoints {
+    SkPoint p[4];
+  };
+  typedef std::vector<CubicPoints> CubicPath;
+  typedef std::vector<CubicPath> CubicPaths;
+
+  // Forwards |bitmap| to SkDevice's constructor.
+  PlatformDeviceWin(const SkBitmap& bitmap);
+
+  // Loads the specified Skia transform into the device context, excluding
+  // perspective (which GDI doesn't support).
+  static void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
+
+  // Transforms SkPath's paths into a series of cubic path.
+  static bool SkPathToCubicPaths(CubicPaths* paths, const SkPath& skpath);
+};
+
+}  // namespace gfx
+
+#endif  // SKIA_EXT_PLATFORM_DEVICE_WIN_H_
+