ui/ozone/demo/renderer_base.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/ozone/demo/renderer_base.h"
   6
   7 namespace ui {
   8
   9 namespace {
  10 const int kAnimationSteps = 240;
  11 }  // namespace
  12
  13 RendererBase::RendererBase(gfx::AcceleratedWidget widget, const gfx::Size& size)
  14     : widget_(widget), size_(size), iteration_(0) {
  15 }
  16
  17 RendererBase::~RendererBase() {
  18 }
  19
  20 float RendererBase::NextFraction() {
  21   float fraction = (sinf(iteration_ * 2 * M_PI / kAnimationSteps) + 1) / 2;
  22
  23   iteration_++;
  24   iteration_ %= kAnimationSteps;
  25
  26   return fraction;
  27 }
  28
  29 }  // namespace ui