Linux Skia: add an option to build a canvas from a provided memory buffer

skia/ext/bitmap_platform_device_linux.h

 // 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_BITMAP_PLATFORM_DEVICE_LINUX_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_LINUX_H_
 
 #include "base/ref_counted.h"
 #include "skia/ext/platform_device_linux.h"
 
@@ skipping 44 matching lines @@
 // case we'll probably create the buffer from a precreated region of memory.
 // -----------------------------------------------------------------------------
 class BitmapPlatformDeviceLinux : public PlatformDeviceLinux {
   // A reference counted cairo surface
   class BitmapPlatformDeviceLinuxData;
 
  public:
   /// Static constructor. I don't understand this, it's just a copy of the mac
   static BitmapPlatformDeviceLinux* Create(int width, int height,
                                            bool is_opaque);
+  static BitmapPlatformDeviceLinux* Create(int width, int height,
+                                           bool is_opaque, uint8_t* data);
+  static BitmapPlatformDeviceLinux* Create(int width, int height,
+                                           bool is_opaque,
+                                           cairo_surface_t* surface);
 
   // Create a BitmapPlatformDeviceLinux from an already constructed bitmap;
   // you should probably be using Create(). This may become private later if
   // we ever have to share state between some native drawing UI and Skia, like
   // the Windows and Mac versions of this class do.
   //
   // This object takes ownership of @data.
   BitmapPlatformDeviceLinux(const SkBitmap& other,
                             BitmapPlatformDeviceLinuxData* data);
   virtual ~BitmapPlatformDeviceLinux();
   BitmapPlatformDeviceLinux& operator=(const BitmapPlatformDeviceLinux& other);
 
   // A stub copy constructor.  Needs to be properly implemented.
   BitmapPlatformDeviceLinux(const BitmapPlatformDeviceLinux& other);
 
   // Bitmaps aren't vector graphics.
   virtual bool IsVectorial() { return false; }
 
   cairo_surface_t* surface() const;
 
  private:
   scoped_refptr<BitmapPlatformDeviceLinuxData> data_;
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_LINUX_H_