edge_effect.cc revision 90dce4d38c5ff5333bea97d859d4e484e27edf0c
190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Copyright (c) 2013 The Chromium Authors. All rights reserved. 290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// found in the LICENSE file. 490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "content/browser/android/edge_effect.h" 690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "cc/layers/layer.h" 890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "ui/gfx/screen.h" 990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)namespace content { 1190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)namespace { 1390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)enum State { 1590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_IDLE = 0, 1690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_PULL, 1790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_ABSORB, 1890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_RECEDE, 1990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_PULL_DECAY 2090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)}; 2190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Time it will take the effect to fully recede in ms 2390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kRecedeTime = 1000; 2490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Time it will take before a pulled glow begins receding in ms 2690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullTime = 167; 2790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Time it will take in ms for a pulled glow to decay before release 2990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullDecayTime = 1000; 3090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 3190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kMaxAlpha = 1.f; 3290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kHeldEdgeScaleY = .5f; 3390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 3490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kMaxGlowHeight = 4.f; 3590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 3690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Note: The Android version computes the aspect ratio from the source texture; 3790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// because we use rescaled images, this is precomputed from the original Android 3890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// textures. 3990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kGlowImageAspectRatioInverse = 0.25f; 4090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kPullGlowBegin = 1.f; 4290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kPullEdgeBegin = 0.6f; 4390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Minimum velocity that will be absorbed 4590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kMinVelocity = 100.f; 4690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kEpsilon = 0.001f; 4890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// How much dragging should effect the height of the edge image. 5090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Number determined by user testing. 5190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullDistanceEdgeFactor = 7; 5290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// How much dragging should effect the height of the glow image. 5490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Number determined by user testing. 5590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullDistanceGlowFactor = 7; 5690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kPullDistanceAlphaGlowFactor = 1.1f; 5790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kVelocityEdgeFactor = 8; 5990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kVelocityGlowFactor = 16; 6090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 6190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)template <typename T> 6290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)T Lerp(T a, T b, T t) { 6390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return a + (b - a) * t; 6490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 6590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 6690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)template <typename T> 6790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)T Clamp(T value, T low, T high) { 6890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return value < low ? low : (value > high ? high : value); 6990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 7090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 7190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)template <typename T> 7290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)T Damp(T input, T factor) { 7390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) T result; 7490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (factor == 1) { 7590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) result = 1 - (1 - input) * (1 - input); 7690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } else { 7790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) result = 1 - std::pow(1 - input, 2 * factor); 7890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 7990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return result; 8090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 8190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 8290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)gfx::Transform ComputeTransform(EdgeEffect::Edge edge, 8390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) gfx::SizeF size, int height) { 8490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) switch (edge) { 8590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) default: 8690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_TOP: 8790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return gfx::Transform(1, 0, 0, 1, 0, 0); 8890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_LEFT: 8990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return gfx::Transform(0, 1, -1, 0, 9090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) (-size.width() + height) / 2 , 9190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) (size.width() - height) / 2); 9290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_BOTTOM: 9390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return gfx::Transform(-1, 0, 0, -1, 0, size.height() - height); 9490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_RIGHT: 9590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return gfx::Transform(0, -1, 1, 0, 9690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) (-size.width() - height) / 2 + size.height(), 9790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) (size.width() - height) / 2); 9890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) }; 9990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void DisableLayer(cc::Layer* layer) { 10290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK(layer); 10390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetIsDrawable(false); 10490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetTransform(gfx::Transform()); 10590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetOpacity(1.f); 10690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void UpdateLayer(cc::Layer* layer, 10990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) EdgeEffect::Edge edge, 11090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) gfx::SizeF size, 11190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int height, 11290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float opacity) { 11390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK(layer); 11490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetIsDrawable(true); 11590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetTransform(ComputeTransform(edge, size, height)); 11690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetBounds(gfx::Size(size.width(), height)); 11790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetOpacity(Clamp(opacity, 0.f, 1.f)); 11890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 11990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 12090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace 12190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 12290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)EdgeEffect::EdgeEffect(scoped_refptr<cc::Layer> edge, 12390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) scoped_refptr<cc::Layer> glow) 12490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) : edge_(edge) 12590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_(glow) 12690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_alpha_(0) 12790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_scale_y_(0) 12890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_alpha_(0) 12990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_scale_y_(0) 13090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_alpha_start_(0) 13190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_alpha_finish_(0) 13290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_scale_y_start_(0) 13390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_scale_y_finish_(0) 13490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_alpha_start_(0) 13590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_alpha_finish_(0) 13690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_scale_y_start_(0) 13790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_scale_y_finish_(0) 13890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , state_(STATE_IDLE) 13990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , pull_distance_(0) 14090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , dpi_scale_(1) { 14190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Prevent the provided layers from drawing until the effect is activated. 14290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DisableLayer(edge_); 14390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DisableLayer(glow_); 14490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 14590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) dpi_scale_ = 14690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().device_scale_factor(); 14790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 14890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 14990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)EdgeEffect::~EdgeEffect() { } 15090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 15190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)bool EdgeEffect::IsFinished() const { 15290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return state_ == STATE_IDLE; 15390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 15490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 15590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Finish() { 15690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DisableLayer(edge_); 15790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DisableLayer(glow_); 15890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) pull_distance_ = 0; 15990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_IDLE; 16090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 16190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 16290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Pull(base::TimeTicks current_time, float delta_distance) { 16390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ == STATE_PULL_DECAY && current_time - start_time_ < duration_) { 16490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 16590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 16690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ != STATE_PULL) { 16790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = kPullGlowBegin; 16890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 16990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_PULL; 17090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 17190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 17290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kPullTime); 17390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 17490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) delta_distance *= dpi_scale_; 17590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float abs_delta_distance = std::abs(delta_distance); 17690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) pull_distance_ += delta_distance; 17790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float distance = std::abs(pull_distance_); 17890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 17990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_ = edge_alpha_start_ = Clamp(distance, kPullEdgeBegin, kMaxAlpha); 18090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = edge_scale_y_start_ 18190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) = Clamp(distance * kPullDistanceEdgeFactor, kHeldEdgeScaleY, 1.f); 18290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 18390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_ = glow_alpha_start_ = 18490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) std::min(kMaxAlpha, 18590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_ + abs_delta_distance * kPullDistanceAlphaGlowFactor); 18690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 18790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float glow_change = abs_delta_distance; 18890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (delta_distance > 0 && pull_distance_ < 0) 18990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_change = -glow_change; 19090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (pull_distance_ == 0) 19190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = 0; 19290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 19390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Do not allow glow to get larger than kMaxGlowHeight. 19490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = glow_scale_y_start_ = 19590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Clamp(glow_scale_y_ + glow_change * kPullDistanceGlowFactor, 19690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 0.f, kMaxGlowHeight); 19790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 19890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = edge_alpha_; 19990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = edge_scale_y_; 20090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = glow_alpha_; 20190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = glow_scale_y_; 20290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 20390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 20490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Release(base::TimeTicks current_time) { 20590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) pull_distance_ = 0; 20690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 20790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ != STATE_PULL && state_ != STATE_PULL_DECAY) 20890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 20990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 21090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_RECEDE; 21190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = edge_alpha_; 21290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_start_ = edge_scale_y_; 21390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_start_ = glow_alpha_; 21490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = glow_scale_y_; 21590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 21690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = 0.f; 21790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = 0.f; 21890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = 0.f; 21990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = 0.f; 22090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 22190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 22290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kRecedeTime); 22390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 22490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 22590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Absorb(base::TimeTicks current_time, float velocity) { 22690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_ABSORB; 22790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) velocity = dpi_scale_ * std::max(kMinVelocity, std::abs(velocity)); 22890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 22990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 23090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // This should never be less than 1 millisecond. 23190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(0.1f + (velocity * 0.03f)); 23290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 23390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // The edge should always be at least partially visible, regardless 23490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // of velocity. 23590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = 0.f; 23690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = edge_scale_y_start_ = 0.f; 23790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // The glow depends more on the velocity, and therefore starts out 23890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // nearly invisible. 23990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_start_ = 0.5f; 24090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = 0.f; 24190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 24290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Factor the velocity by 8. Testing on device shows this works best to 24390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // reflect the strength of the user's scrolling. 24490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = Clamp(velocity * kVelocityEdgeFactor, 0.f, 1.f); 24590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Edge should never get larger than the size of its asset. 24690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = Clamp(velocity * kVelocityEdgeFactor, 24790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) kHeldEdgeScaleY, 1.f); 24890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 24990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Growth for the size of the glow should be quadratic to properly 25090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // respond 25190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // to a user's scrolling speed. The faster the scrolling speed, the more 25290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // intense the effect should be for both the size and the saturation. 25390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = 25490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) std::min(0.025f + (velocity * (velocity / 100) * 0.00015f), 1.75f); 25590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Alpha should change for the glow as well as size. 25690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = 25790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Clamp(glow_alpha_start_, 25890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) velocity * kVelocityGlowFactor * .00001f, kMaxAlpha); 25990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 26090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 26190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)bool EdgeEffect::Update(base::TimeTicks current_time) { 26290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (IsFinished()) 26390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return false; 26490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 26590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const double dt = (current_time - start_time_).InMilliseconds(); 26690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const double t = std::min(dt / duration_.InMilliseconds(), 1.); 26790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const float interp = static_cast<float>(Damp(t, 1.)); 26890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 26990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_ = Lerp(edge_alpha_start_, edge_alpha_finish_, interp); 27090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = Lerp(edge_scale_y_start_, edge_scale_y_finish_, interp); 27190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_ = Lerp(glow_alpha_start_, glow_alpha_finish_, interp); 27290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = Lerp(glow_scale_y_start_, glow_scale_y_finish_, interp); 27390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 27490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (t >= 1.f - kEpsilon) { 27590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) switch (state_) { 27690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case STATE_ABSORB: 27790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_RECEDE; 27890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 27990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kRecedeTime); 28090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 28190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = edge_alpha_; 28290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_start_ = edge_scale_y_; 28390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_start_ = glow_alpha_; 28490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = glow_scale_y_; 28590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 28690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // After absorb, the glow and edge should fade to nothing. 28790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = 0.f; 28890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = 0.f; 28990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = 0.f; 29090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = 0.f; 29190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 29290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case STATE_PULL: 29390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_PULL_DECAY; 29490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 29590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kPullDecayTime); 29690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 29790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = edge_alpha_; 29890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_start_ = edge_scale_y_; 29990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_start_ = glow_alpha_; 30090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = glow_scale_y_; 30190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 30290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // After pull, the glow and edge should fade to nothing. 30390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = 0.f; 30490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = 0.f; 30590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = 0.f; 30690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = 0.f; 30790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 30890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case STATE_PULL_DECAY: 30990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) { 31090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // When receding, we want edge to decrease more slowly 31190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // than the glow. 31290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float factor = glow_scale_y_finish_ != 0 ? 31390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1 / (glow_scale_y_finish_ * glow_scale_y_finish_) : 31490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) std::numeric_limits<float>::max(); 31590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = edge_scale_y_start_ + 31690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) (edge_scale_y_finish_ - edge_scale_y_start_) * interp * factor; 31790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_RECEDE; 31890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 31990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 32090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case STATE_RECEDE: 32190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Finish(); 32290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 32390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) default: 32490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 32590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 32690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 32790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 32890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ == STATE_RECEDE && glow_scale_y_ <= 0 && edge_scale_y_ <= 0) 32990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Finish(); 33090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 33190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return !IsFinished(); 33290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 33390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 33490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::ApplyToLayers(gfx::SizeF size, Edge edge) { 33590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (IsFinished()) 33690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 33790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 33890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // An empty effect size, while meaningless, is also relatively harmless, and 33990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // will simply prevent any drawing of the layers. 34090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (size.IsEmpty()) { 34190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DisableLayer(edge_); 34290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DisableLayer(glow_); 34390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 34490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 34590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 34690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float dummy_scale_x, dummy_scale_y; 34790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 34890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Glow 34990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) gfx::Size glow_image_bounds; 35090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_->CalculateContentsScale(1.f, 1.f, 1.f, false, 35190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) &dummy_scale_x, &dummy_scale_y, 35290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) &glow_image_bounds); 35390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const int glow_height = glow_image_bounds.height(); 35490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const int glow_bottom = static_cast<int>(std::min( 35590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_height * glow_scale_y_ * kGlowImageAspectRatioInverse * 0.6f, 35690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_height * kMaxGlowHeight) * dpi_scale_ + 0.5f); 35790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) UpdateLayer(glow_, edge, size, glow_bottom, glow_alpha_); 35890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 35990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Edge 36090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) gfx::Size edge_image_bounds; 36190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_->CalculateContentsScale(1.f, 1.f, 1.f, false, 36290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) &dummy_scale_x, &dummy_scale_y, 36390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) &edge_image_bounds); 36490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const int edge_height = edge_image_bounds.height(); 36590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const int edge_bottom = static_cast<int>( 36690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_height * edge_scale_y_ * dpi_scale_); 36790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) UpdateLayer(edge_, edge, size, edge_bottom, edge_alpha_); 36890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 36990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 37090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace content 371