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

remoting/client/gl_cursor_feedback.cc

-// 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 "remoting/client/gl_cursor_feedback.h"
-
-#include <math.h>
-
-#include <array>
-
-#include "base/logging.h"
-#include "remoting/client/gl_canvas.h"
-#include "remoting/client/gl_cursor_feedback_texture.h"
-#include "remoting/client/gl_math.h"
-#include "remoting/client/gl_render_layer.h"
-#include "remoting/client/gl_texture_ids.h"
-
-namespace {
-
-const float kAnimationDurationMs = 300.f;
-
-// This function is for calculating the size of the feedback animation circle at
-// the moment when the animation progress is |progress|.
-// |progress|: [0, 1], indicating the progress of the animation.
-// Returns a coefficient in [0, 1]. It will be multiplied with the maximum
-// diameter of the feedback circle to get the current diameter of the feedback
-// circle.
-float GetExpansionCoefficient(float progress) {
-  DCHECK(progress >= 0 && progress <= 1);
-
-  // Decelerating expansion. This is conforming to the material design spec.
-  // More time will be spent showing the larger circle and the animation will
-  // look more rapid given the same time duration.
-  auto get_unnormalized_coeff = [](float progress) {
-    static const float kExpansionBase = 400.f;
-    return 1.f - pow(kExpansionBase, -progress);
-  };
-  static const float kExpansionNormalization = get_unnormalized_coeff(1);
-  return get_unnormalized_coeff(progress) / kExpansionNormalization;
-}
-
-}  // namespace
-
-namespace remoting {
-
-GlCursorFeedback::GlCursorFeedback() {}
-
-GlCursorFeedback::~GlCursorFeedback() {}
-
-void GlCursorFeedback::SetCanvas(GlCanvas* canvas) {
-  if (!canvas) {
-    layer_.reset();
-    return;
-  }
-  layer_.reset(new GlRenderLayer(kGlCursorFeedbackTextureId, canvas));
-  GlCursorFeedbackTexture* texture = GlCursorFeedbackTexture::GetInstance();
-  layer_->SetTexture(texture->GetTexture().data(),
-                     GlCursorFeedbackTexture::kTextureWidth,
-                     GlCursorFeedbackTexture::kTextureWidth, 0);
-}
-
-void GlCursorFeedback::StartAnimation(float x, float y, float diameter) {
-  cursor_x_ = x;
-  cursor_y_ = y;
-  max_diameter_ = diameter;
-  animation_start_time_ = base::TimeTicks::Now();
-}
-
-bool GlCursorFeedback::Draw() {
-  if (!layer_ || animation_start_time_.is_null()) {
-    return false;
-  }
-  float progress =
-      (base::TimeTicks::Now() - animation_start_time_).InMilliseconds() /
-      kAnimationDurationMs;
-  if (progress > 1) {
-    animation_start_time_ = base::TimeTicks();
-    return false;
-  }
-  float diameter = GetExpansionCoefficient(progress) * max_diameter_;
-  std::array<float, 8> positions;
-  FillRectangleVertexPositions(cursor_x_ - diameter / 2,
-                               cursor_y_ - diameter / 2,
-                               diameter, diameter, &positions);
-  layer_->SetVertexPositions(positions);
-
-  // Linear fade-out.
-  layer_->Draw(1.f - progress);
-  return true;
-}
-
-}  // namespace remoting