Roll skia to 8cc209111876b7c78b5ec577c9221d8ed5e21024

skia/ext/bitmap_platform_device_mac.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_MAC_H_
-#define SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "skia/ext/platform_device.h"
-#include "skia/ext/refptr.h"
-
-namespace skia {
-
-// A device is basically a wrapper around SkBitmap that provides a surface for
-// SkCanvas to draw into. Our device provides a surface CoreGraphics can also
-// write to. BitmapPlatformDevice creates a bitmap using
-// CGCreateBitmapContext() in a format that Skia supports and can then use this
-// to draw text into, etc. This pixel data is provided to the bitmap that the
-// device contains so that it can be shared.
-//
-// The device owns the pixel data, when the device goes away, the pixel data
-// also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses
-// reference counting for the pixel data. In normal Skia, you could assign
-// another bitmap to this device's bitmap and everything will work properly.
-// For us, that other bitmap will become invalid as soon as the device becomes
-// invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE
-// DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead.
-class SK_API BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
- public:
-  // Creates a BitmapPlatformDevice instance. |is_opaque| should be set if the
-  // caller knows the bitmap will be completely opaque and allows some
-  // optimizations.
-  // |context| may be NULL. If |context| is NULL, then the bitmap backing store
-  // is not initialized.
-  static BitmapPlatformDevice* Create(CGContextRef context,
-                                      int width, int height,
-                                      bool is_opaque, bool do_clear = false);
-
-  // Creates a context for |data| and calls Create.
-  // If |data| is NULL, then the bitmap backing store is not initialized.
-  static BitmapPlatformDevice* CreateWithData(uint8_t* data,
-                                              int width, int height,
-                                              bool is_opaque);
-
-  ~BitmapPlatformDevice() override;
-
-  // PlatformDevice overrides
-  CGContextRef GetBitmapContext() override;
-
-  // SkBaseDevice overrides
-  void setMatrixClip(const SkMatrix& transform,
-                     const SkRegion& region,
-                     const SkClipStack&) override;
-
- protected:
-  BitmapPlatformDevice(CGContextRef context,
-                       const SkBitmap& bitmap);
-
-  SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
-
- private:
-  void ReleaseBitmapContext();
-
-  // Sets the transform and clip operations. This will not update the CGContext,
-  // 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 |bitmap_context_| is NULL (will be a NOP).
-  void LoadConfig();
-
-  // Lazily-created graphics context used to draw into the bitmap.
-  CGContextRef bitmap_context_;
-
-  // 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
-  SkRegion clip_region_;
-  DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
-};
-
-}  // namespace skia
-
-#endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_