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// 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.
#include <queue>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "remoting/client/gl_cursor.h"
#include "remoting/client/gl_cursor_feedback.h"
#include "remoting/client/gl_desktop.h"
#include "remoting/proto/control.pb.h"
namespace webrtc {
class DesktopFrame;
} // namespace webrtc
namespace remoting {
namespace protocol {
class CursorShapeInfo;
} // namespace protocol
class GlCanvas;
class GlRendererDelegate;
class GlRendererTest;
// Renders desktop and cursor on the OpenGL surface. Can be created on any
// thread but thereafter must be used and deleted on the same thread (usually
// the display thread. Or any Chromium thread with a task runner attached to
// it) unless otherwise noted.
// The unit of all length arguments is pixel.
class GlRenderer {
explicit GlRenderer();
// The delegate can be set on any hread no more than once before calling any
// On* functions.
void SetDelegate(base::WeakPtr<GlRendererDelegate> delegate);
// Notifies the delegate with the current canvas size. Canvas size will be
// (0, 0) if no desktop frame is received yet.
// Caller can use this function to get the canvas size when the surface is
// recreated.
void RequestCanvasSize();
// Sets the pixel based transformation matrix related to the size of the
// canvas.
// 3 by 3 transformation matrix, [ m0, m1, m2, m3, m4, m5, m6, m7, m8 ].
// | m0, m1, m2, | | x |
// | m3, m4, m5, | * | y |
// | m6, m7, m8 | | 1 |
// The final size of the canvas will be (m0*canvas_width, m4*canvas_height)
// and the top-left corner will be (m2, m5) in pixel coordinates.
void OnPixelTransformationChanged(const std::array<float, 9>& matrix);
void OnCursorMoved(float x, float y);
void OnCursorInputFeedback(float x, float y, float diameter);
void OnCursorVisibilityChanged(bool visible);
// Called when a desktop frame is received.
// The size of the canvas is determined by the dimension of the desktop frame.
// |done| will be queued up and called on the display thread after the actual
// rendering happens.
void OnFrameReceived(std::unique_ptr<webrtc::DesktopFrame> frame,
const base::Closure& done);
void OnCursorShapeChanged(const protocol::CursorShapeInfo& shape);
// Called after the EGL/EAGL context is established and the surface is created
// (or recreated). Previous desktop frame and canvas transformation will be
// lost after calling this function.
// Caller must call OnSurfaceDestroyed() before calling this function if the
// surface is recreated.
void OnSurfaceCreated(int gl_version);
// Sets the size of the view. Called right after OnSurfaceCreated() or
// whenever the view size is changed.
void OnSurfaceChanged(int view_width, int view_height);
// Called when the surface is destroyed.
void OnSurfaceDestroyed();
// Returns the weak pointer to be used on the display thread.
base::WeakPtr<GlRenderer> GetWeakPtr();
friend class GlRendererTest;
// Post a rendering task to the task runner of current thread.
// Do nothing if render_callback_ is not set yet or an existing rendering task
// in the queue will cover changes before this function is called.
void RequestRender();
// Draws out everything on current OpenGL buffer and runs closures in
// |pending_done_callbacks_|.
// Nothing will be drawn nor the done callbacks will be run if |delegate_| is
// invalid or !delegate_.CanRenderFrame().
void OnRender();
base::WeakPtr<GlRendererDelegate> delegate_;
// Done callbacks from OnFrameReceived. Will all be called once rendering
// takes place.
std::queue<base::Closure> pending_done_callbacks_;
bool render_scheduled_ = false;
int canvas_width_ = 0;
int canvas_height_ = 0;
std::unique_ptr<GlCanvas> canvas_;
GlCursor cursor_;
GlCursorFeedback cursor_feedback_;
GlDesktop desktop_;
base::ThreadChecker thread_checker_;
base::WeakPtr<GlRenderer> weak_ptr_;
base::WeakPtrFactory<GlRenderer> weak_factory_;
} // namespace remoting