[Remoting Android] Cursor & Cursor Feedback for OpenGL Renderer

remoting/client/gl_render_layer.h

 // Copyright 2016 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 REMOTING_CLIENT_OPENGL_GL_RENDER_LAYER_H_
 #define REMOTING_CLIENT_OPENGL_GL_RENDER_LAYER_H_
 
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "remoting/client/sys_opengl.h"
 
 namespace remoting {
 class GlCanvas;
 
 // This class is for drawing a texture on the canvas. Must be deleted before the
 // canvas is deleted.
 class GlRenderLayer {
  public:
+  static const int kBytesPerPixel = 4;
+
   // texture_id: An integer in range [0, GL_MAX_TEXTURE_IMAGE_UNITS], defining
   //             which slot to store the texture.
   GlRenderLayer(int texture_id, GlCanvas* canvas);
   ~GlRenderLayer();
 
   // Sets the texture (RGBA 8888) to be drawn. Please use UpdateTexture() if the
   // texture size isn't changed.
   void SetTexture(const uint8_t* texture, int width, int height);
 
   // Updates a subregion (RGBA 8888) of the texture.
@@ skipping 14 matching lines @@
   //              x_upperright, y_upperright, x_lowerright, y_lowerright ]
   void SetVertexPositions(const std::array<float, 8>& positions);
 
   // Sets the visible area of the texture. The default values are (0, 0),
   // (0, 1), (1, 0), (1, 1), i.e. showing the whole texture.
   // positions: [ x_upperleft, y_upperleft, x_lowerleft, y_lowerleft,
   //              x_upperright, y_upperright, x_lowerright, y_lowerright ]
   void SetTextureVisibleArea(const std::array<float, 8>& positions);
 
   // Draws the texture on the canvas. Texture must be set before calling Draw().
-  void Draw();
+  void Draw(float alpha_multiplier);
 
  private:
   int texture_id_;
   GlCanvas* canvas_;
 
   GLuint texture_handle_;
   GLuint buffer_handle_;
 
   // true IFF the texture is already set by calling SetTexture().
   bool texture_set_ = false;
 
   // Used in OpenGL ES 2 context which doesn't support GL_UNPACK_ROW_LENGTH to
   // tightly pack dirty regions before sending them to GPU.
   std::unique_ptr<uint8_t[]> update_buffer_;
   int update_buffer_size_ = 0;
 
   base::ThreadChecker thread_checker_;
   DISALLOW_COPY_AND_ASSIGN(GlRenderLayer);
 };
 
 }  // namespace remoting
 #endif  // REMOTING_CLIENT_OPENGL_GL_RENDER_LAYER_H_