edge_effect.cc revision a02191e04bc25c4935f804f2c080ae28663d096d
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) 990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)namespace content { 1090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)namespace { 1290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)enum State { 1490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_IDLE = 0, 1590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_PULL, 1690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_ABSORB, 1790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_RECEDE, 1890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) STATE_PULL_DECAY 1990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)}; 2090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Time it will take the effect to fully recede in ms 2290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kRecedeTime = 1000; 2390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Time it will take before a pulled glow begins receding in ms 2590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullTime = 167; 2690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Time it will take in ms for a pulled glow to decay before release 2890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullDecayTime = 1000; 2990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 3090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kMaxAlpha = 1.f; 3190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kHeldEdgeScaleY = .5f; 3290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 3390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kMaxGlowHeight = 4.f; 3490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 3590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kPullGlowBegin = 1.f; 3690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kPullEdgeBegin = 0.6f; 3790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 388bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles)// Min/max velocity that will be absorbed 3990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kMinVelocity = 100.f; 408bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles)const float kMaxVelocity = 10000.f; 4190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kEpsilon = 0.001f; 4390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 44a02191e04bc25c4935f804f2c080ae28663d096dBen Murdochconst float kGlowHeightToWidthRatio = 0.25f; 45a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch 4690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// How much dragging should effect the height of the edge image. 4790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Number determined by user testing. 4890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullDistanceEdgeFactor = 7; 4990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// How much dragging should effect the height of the glow image. 5190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Number determined by user testing. 5290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kPullDistanceGlowFactor = 7; 5390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const float kPullDistanceAlphaGlowFactor = 1.1f; 5490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)const int kVelocityEdgeFactor = 8; 568bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles)const int kVelocityGlowFactor = 12; 5790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)template <typename T> 5990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)T Lerp(T a, T b, T t) { 6090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return a + (b - a) * t; 6190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 6290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 6390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)template <typename T> 6490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)T Clamp(T value, T low, T high) { 6590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return value < low ? low : (value > high ? high : value); 6690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 6790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 6890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)template <typename T> 6990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)T Damp(T input, T factor) { 7090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) T result; 7190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (factor == 1) { 7290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) result = 1 - (1 - input) * (1 - input); 7390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } else { 7490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) result = 1 - std::pow(1 - input, 2 * factor); 7590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 7690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return result; 7790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 7890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 7990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)gfx::Transform ComputeTransform(EdgeEffect::Edge edge, 80a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch const gfx::SizeF& window_size, 81a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch int offset, 82a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch int height) { 83a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch // Edge effects that require rotation are translated to the center about which 84a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch // the layer should be rotated to align with the corresponding edge. 8590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) switch (edge) { 8690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_TOP: 87a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch return gfx::Transform(1, 0, 0, 1, 0, offset); 8890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_LEFT: 8990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return gfx::Transform(0, 1, -1, 0, 90a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch (-window_size.height() + height) / 2.f + offset, 91a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch (window_size.height() - height) / 2.f); 9290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_BOTTOM: 93a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch return gfx::Transform(-1, 0, 0, -1, 94a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch 0, window_size.height() - height + offset); 9590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case EdgeEffect::EDGE_RIGHT: 9690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return gfx::Transform(0, -1, 1, 0, 97a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch (-window_size.height() - height) / 2.f + window_size.width() + offset, 98a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch (window_size.height() - height) / 2.f); 99a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch default: 100a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch NOTREACHED() << "Invalid edge: " << edge; 101a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch return gfx::Transform(); 102a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch }; 103a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch} 104a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch 105a02191e04bc25c4935f804f2c080ae28663d096dBen Murdochgfx::Size ComputeBounds(EdgeEffect::Edge edge, 106a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch const gfx::SizeF& window_size, 107a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch int height) { 108a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch switch (edge) { 109a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch case EdgeEffect::EDGE_TOP: 110a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch case EdgeEffect::EDGE_BOTTOM: 111a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch return gfx::Size(window_size.width(), height); 112a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch case EdgeEffect::EDGE_LEFT: 113a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch case EdgeEffect::EDGE_RIGHT: 114a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch return gfx::Size(window_size.height(), height); 115a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch default: 116a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch NOTREACHED() << "Invalid edge: " << edge; 117a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch return gfx::Size(); 11890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) }; 11990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 12090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 12190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void DisableLayer(cc::Layer* layer) { 12290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK(layer); 12390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetIsDrawable(false); 12490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetTransform(gfx::Transform()); 12590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetOpacity(1.f); 12690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 12790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 12890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void UpdateLayer(cc::Layer* layer, 12990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) EdgeEffect::Edge edge, 130a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch const gfx::SizeF& window_size, 131a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch int offset, 13290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int height, 13390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float opacity) { 13490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK(layer); 13590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetIsDrawable(true); 136a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch layer->SetTransform(ComputeTransform(edge, window_size, offset, height)); 137a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch layer->SetBounds(ComputeBounds(edge, window_size, height)); 13890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) layer->SetOpacity(Clamp(opacity, 0.f, 1.f)); 13990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 14090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 14190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace 14290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 14390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)EdgeEffect::EdgeEffect(scoped_refptr<cc::Layer> edge, 14490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) scoped_refptr<cc::Layer> glow) 14590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) : edge_(edge) 14690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_(glow) 14790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_alpha_(0) 14890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_scale_y_(0) 14990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_alpha_(0) 15090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_scale_y_(0) 15190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_alpha_start_(0) 15290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_alpha_finish_(0) 15390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_scale_y_start_(0) 15490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , edge_scale_y_finish_(0) 15590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_alpha_start_(0) 15690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_alpha_finish_(0) 15790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_scale_y_start_(0) 15890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , glow_scale_y_finish_(0) 15990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) , state_(STATE_IDLE) 160a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch , pull_distance_(0) { 16190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Prevent the provided layers from drawing until the effect is activated. 1627d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DisableLayer(edge_.get()); 1637d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DisableLayer(glow_.get()); 16490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 16590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 16690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)EdgeEffect::~EdgeEffect() { } 16790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 16890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)bool EdgeEffect::IsFinished() const { 16990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return state_ == STATE_IDLE; 17090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 17190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 17290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Finish() { 1737d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DisableLayer(edge_.get()); 1747d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DisableLayer(glow_.get()); 17590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) pull_distance_ = 0; 17690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_IDLE; 17790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 17890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 17990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Pull(base::TimeTicks current_time, float delta_distance) { 18090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ == STATE_PULL_DECAY && current_time - start_time_ < duration_) { 18190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 18290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 18390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ != STATE_PULL) { 18490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = kPullGlowBegin; 18590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 18690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_PULL; 18790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 18890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 18990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kPullTime); 19090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 19190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float abs_delta_distance = std::abs(delta_distance); 19290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) pull_distance_ += delta_distance; 19390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float distance = std::abs(pull_distance_); 19490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 19590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_ = edge_alpha_start_ = Clamp(distance, kPullEdgeBegin, kMaxAlpha); 19690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = edge_scale_y_start_ 19790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) = Clamp(distance * kPullDistanceEdgeFactor, kHeldEdgeScaleY, 1.f); 19890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 19990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_ = glow_alpha_start_ = 20090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) std::min(kMaxAlpha, 20190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_ + abs_delta_distance * kPullDistanceAlphaGlowFactor); 20290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 20390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) float glow_change = abs_delta_distance; 20490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (delta_distance > 0 && pull_distance_ < 0) 20590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_change = -glow_change; 20690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (pull_distance_ == 0) 20790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = 0; 20890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 20990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Do not allow glow to get larger than kMaxGlowHeight. 21090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = glow_scale_y_start_ = 21190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Clamp(glow_scale_y_ + glow_change * kPullDistanceGlowFactor, 21290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 0.f, kMaxGlowHeight); 21390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 21490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = edge_alpha_; 21590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = edge_scale_y_; 21690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = glow_alpha_; 21790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = glow_scale_y_; 21890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 21990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 22090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Release(base::TimeTicks current_time) { 22190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) pull_distance_ = 0; 22290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 22390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ != STATE_PULL && state_ != STATE_PULL_DECAY) 22490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 22590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 22690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_RECEDE; 22790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = edge_alpha_; 22890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_start_ = edge_scale_y_; 22990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_start_ = glow_alpha_; 23090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = glow_scale_y_; 23190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 23290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = 0.f; 23390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = 0.f; 23490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = 0.f; 23590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = 0.f; 23690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 23790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 23890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kRecedeTime); 23990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 24090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 24190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void EdgeEffect::Absorb(base::TimeTicks current_time, float velocity) { 24290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_ABSORB; 243a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch velocity = Clamp(std::abs(velocity), kMinVelocity, kMaxVelocity); 24490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 24590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 24690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // This should never be less than 1 millisecond. 2478bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(0.15f + (velocity * 0.02f)); 24890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 24990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // The edge should always be at least partially visible, regardless 25090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // of velocity. 25190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = 0.f; 25290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = edge_scale_y_start_ = 0.f; 25390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // The glow depends more on the velocity, and therefore starts out 25490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // nearly invisible. 2558bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles) glow_alpha_start_ = 0.3f; 25690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = 0.f; 25790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 25890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Factor the velocity by 8. Testing on device shows this works best to 25990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // reflect the strength of the user's scrolling. 260a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch edge_alpha_finish_ = Clamp(velocity * kVelocityEdgeFactor, 0.f, 1.f); 26190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Edge should never get larger than the size of its asset. 262a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch edge_scale_y_finish_ = Clamp(velocity * kVelocityEdgeFactor, 26390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) kHeldEdgeScaleY, 1.f); 26490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 26590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Growth for the size of the glow should be quadratic to properly 26690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // respond 26790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // to a user's scrolling speed. The faster the scrolling speed, the more 26890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // intense the effect should be for both the size and the saturation. 269d3868032626d59662ff73b372b5d584c1d144c53Ben Murdoch glow_scale_y_finish_ = std::min( 270a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch 0.025f + (velocity * (velocity / 100) * 0.00015f), 1.75f); 27190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Alpha should change for the glow as well as size. 272d3868032626d59662ff73b372b5d584c1d144c53Ben Murdoch glow_alpha_finish_ = Clamp(glow_alpha_start_, 273a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch velocity * kVelocityGlowFactor * .00001f, 274d3868032626d59662ff73b372b5d584c1d144c53Ben Murdoch kMaxAlpha); 27590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 27690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 27790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)bool EdgeEffect::Update(base::TimeTicks current_time) { 27890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (IsFinished()) 27990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return false; 28090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 28190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const double dt = (current_time - start_time_).InMilliseconds(); 28290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const double t = std::min(dt / duration_.InMilliseconds(), 1.); 28390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) const float interp = static_cast<float>(Damp(t, 1.)); 28490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 28590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_ = Lerp(edge_alpha_start_, edge_alpha_finish_, interp); 28690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_ = Lerp(edge_scale_y_start_, edge_scale_y_finish_, interp); 28790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_ = Lerp(glow_alpha_start_, glow_alpha_finish_, interp); 28890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_ = Lerp(glow_scale_y_start_, glow_scale_y_finish_, interp); 28990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 29090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (t >= 1.f - kEpsilon) { 29190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) switch (state_) { 29290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case STATE_ABSORB: 29390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_RECEDE; 29490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 29590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kRecedeTime); 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 absorb, 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: 30990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) state_ = STATE_PULL_DECAY; 31090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) start_time_ = current_time; 31190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) duration_ = base::TimeDelta::FromMilliseconds(kPullDecayTime); 31290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 31390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_start_ = edge_alpha_; 31490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_start_ = edge_scale_y_; 31590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_start_ = glow_alpha_; 31690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_start_ = glow_scale_y_; 31790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 31890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // After pull, the glow and edge should fade to nothing. 31990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_alpha_finish_ = 0.f; 32090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) edge_scale_y_finish_ = 0.f; 32190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_alpha_finish_ = 0.f; 32290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) glow_scale_y_finish_ = 0.f; 32390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 324a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch case STATE_PULL_DECAY: { 325a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch // When receding, we want edge to decrease more slowly 326a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch // than the glow. 327a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch const float factor = glow_scale_y_finish_ != 0 ? 328a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch 1 / (glow_scale_y_finish_ * glow_scale_y_finish_) : 329a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch std::numeric_limits<float>::max(); 330a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch edge_scale_y_ = edge_scale_y_start_ + 331a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch (edge_scale_y_finish_ - edge_scale_y_start_) * interp * factor; 332a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch state_ = STATE_RECEDE; 333a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch } break; 33490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case STATE_RECEDE: 33590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Finish(); 33690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 33790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) default: 33890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) break; 33990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 34090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 34190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 34290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (state_ == STATE_RECEDE && glow_scale_y_ <= 0 && edge_scale_y_ <= 0) 34390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) Finish(); 34490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 34590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return !IsFinished(); 34690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 34790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 348a02191e04bc25c4935f804f2c080ae28663d096dBen Murdochvoid EdgeEffect::ApplyToLayers(gfx::SizeF window_size, 349a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch Edge edge, 350a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch float edge_height, 351a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch float glow_height, 352a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch float offset) { 35390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (IsFinished()) 35490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 35590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 356a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch // An empty window size, while meaningless, is also relatively harmless, and 35790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // will simply prevent any drawing of the layers. 358a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch if (window_size.IsEmpty()) { 3597d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DisableLayer(edge_.get()); 3607d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DisableLayer(glow_.get()); 36190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 36290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 36390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 36490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Glow 365a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch const int scaled_glow_height = static_cast<int>( 366a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch std::min(glow_height * glow_scale_y_ * kGlowHeightToWidthRatio * 0.6f, 367a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch glow_height * kMaxGlowHeight) + 0.5f); 368a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch UpdateLayer( 369a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch glow_.get(), edge, window_size, offset, scaled_glow_height, glow_alpha_); 37090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 37190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Edge 372a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch const int scaled_edge_height = static_cast<int>(edge_height * edge_scale_y_); 373a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch UpdateLayer( 374a02191e04bc25c4935f804f2c080ae28663d096dBen Murdoch edge_.get(), edge, window_size, offset, scaled_edge_height, edge_alpha_); 37590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 37690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 37790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace content 378