Moving the GL implementation details into a sub folder for client display.

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 <array>
-#include <memory>
-
-#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.
-  // stride: byte distance between two rows in |subtexture|.
-  // If |stride| is 0 or |stride| == |width|*kBytesPerPixel, |subtexture| will
-  // be treated as tightly packed.
-  void SetTexture(const uint8_t* texture, int width, int height, int stride);
-
-  // Updates a subregion (RGBA 8888) of the texture. Can only be called after
-  // SetTexture() has been called.
-  // stride: See SetTexture().
-  void UpdateTexture(const uint8_t* subtexture,
-                     int offset_x,
-                     int offset_y,
-                     int width,
-                     int height,
-                     int stride);
-
-  // Sets the positions of four vertices of the texture in pixel with respect to
-  // the canvas.
-  // positions: [ x_upperleft, y_upperleft, x_lowerleft, y_lowerleft,
-  //              x_upperright, y_upperright, x_lowerright, y_lowerright ]
-  void SetVertexPositions(const std::array<float, 8>& positions);
-
-  // Sets the visible area of the texture in percentage of the width and height
-  // 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(float alpha_multiplier);
-
-  // true if the texture is already set by calling SetTexture().
-  bool is_texture_set() { return texture_set_; }
-
- private:
-  // Returns pointer to the texture buffer that can be used by glTexImage2d or
-  // glTexSubImage2d. The returned value will be |data| if the texture can be
-  // used without manual packing, otherwise the data will be manually packed and
-  // the pointer to |update_buffer_| will be returned.
-  // should_reset_row_length: Pointer to a bool that will be set by the
-  //                          function. If this is true, the user need to call
-  //                          glPixelStorei(GL_UNPACK_ROW_LENGTH, 0) after
-  //                          updating the texture to reset the stride.
-  const uint8_t* PrepareTextureBuffer(const uint8_t* data,
-                                      int width,
-                                      int height,
-                                      int stride,
-                                      bool* should_reset_row_length);
-
-  int texture_id_;
-  GlCanvas* canvas_;
-
-  GLuint texture_handle_;
-  GLuint buffer_handle_;
-
-  bool texture_set_ = false;
-
-  bool vertex_position_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_