Replace setMatrixClip() with BeginPlatformPaint() logic

skia/ext/bitmap_platform_device_win.h

 // 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.
 
 #ifndef SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "skia/ext/platform_device.h"
@@ skipping 21 matching lines @@
   static BitmapPlatformDevice* Create(int width, int height,
                                       bool is_opaque, HANDLE shared_section,
                                       bool do_clear = false);
 
   // Create a BitmapPlatformDevice with no shared section. The bitmap is not
   // initialized to 0.
   static BitmapPlatformDevice* Create(int width, int height, bool is_opaque);
 
   ~BitmapPlatformDevice() override;
 
-  // Loads (lazily) the given transform and clipping region into the HDC. This
-  // is overridden from SkBaseDevice, where it is deprecated.
-  void setMatrixClip(const SkMatrix& transform,
-                     const SkRegion& region,
-                     const SkClipStack&) override;
-
-  void DrawToHDC(HDC dc, int x, int y, const RECT* src_rect) override;
+  void DrawToHDC(HDC source_dc, HDC destination_dc, int x, int y,
+                 const RECT* src_rect, const SkMatrix& transform) override;
 
  protected:
   // Flushes the Windows device context so that the pixel data can be accessed
   // directly by Skia. Overridden from SkBaseDevice, this is called when Skia
   // starts accessing pixel data.
   const SkBitmap& onAccessBitmap() override;
 
   SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
 
  private:
   // PlatformDevice override
   // Retrieves the bitmap DC, which is the memory DC for our bitmap data. The
   // bitmap DC may be lazily created.
-  PlatformSurface BeginPlatformPaint() override;
+  PlatformSurface BeginPlatformPaint(const SkMatrix& transform,
+                                     const SkIRect& clip_bounds) override;
 
   // Private constructor.
   BitmapPlatformDevice(HBITMAP hbitmap, const SkBitmap& bitmap);
 
   // Bitmap into which the drawing will be done. This bitmap not owned by this
   // class, but by the BitmapPlatformPixelRef inside the device's SkBitmap.
   // It's only stored here in order to lazy-create the DC (below).
   HBITMAP hbitmap_;
 
   // Previous bitmap held by the DC. This will be selected back before the
   // DC is destroyed.
   HBITMAP old_hbitmap_;
 
   // Lazily-created DC used to draw into the bitmap; see GetBitmapDC().
   HDC hdc_;
 
-  // True when there is a transform or clip that has not been set to the
-  // context.  The context is retrieved for every text operation, and the
-  // transform and clip do not change as much. We can save time by not loading
-  // the clip and transform for every one.
-  bool config_dirty_;
-
-  // Translation assigned to the context: we need to keep track of this
-  // separately so it can be updated even if the context isn't created yet.
-  SkMatrix transform_;
-
-  // The current clipping region.
-  SkRegion clip_region_;
-
   // Create/destroy hdc_, which is the memory DC for our bitmap data.
-  HDC GetBitmapDC();
+  HDC GetBitmapDC(const SkMatrix& transform, const SkIRect& clip_bounds);
   void ReleaseBitmapDC();
   bool IsBitmapDCCreated() const;
 
-  // Sets the transform and clip operations. This will not update the DC,
-  // but will mark the config as dirty. The next call of LoadConfig will
-  // pick up these changes.
-  void SetMatrixClip(const SkMatrix& transform, const SkRegion& region);
-
   // Loads the current transform and clip into the context. Can be called even
   // when |hbitmap_| is NULL (will be a NOP).
-  void LoadConfig();
+  void LoadConfig(const SkMatrix& transform, const SkIRect& clip_bounds);
 
   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
   friend class ScopedPlatformPaint;
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_WIN_H_