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      1 // Copyright 2013 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 "cc/layers/painted_scrollbar_layer_impl.h"
      6 
      7 #include <algorithm>
      8 
      9 #include "cc/animation/scrollbar_animation_controller.h"
     10 #include "cc/layers/layer.h"
     11 #include "cc/layers/quad_sink.h"
     12 #include "cc/quads/solid_color_draw_quad.h"
     13 #include "cc/quads/texture_draw_quad.h"
     14 #include "cc/trees/layer_tree_impl.h"
     15 #include "cc/trees/layer_tree_settings.h"
     16 #include "ui/gfx/rect_conversions.h"
     17 
     18 namespace cc {
     19 
     20 scoped_ptr<PaintedScrollbarLayerImpl> PaintedScrollbarLayerImpl::Create(
     21     LayerTreeImpl* tree_impl,
     22     int id,
     23     ScrollbarOrientation orientation) {
     24   return make_scoped_ptr(
     25       new PaintedScrollbarLayerImpl(tree_impl, id, orientation));
     26 }
     27 
     28 PaintedScrollbarLayerImpl::PaintedScrollbarLayerImpl(
     29     LayerTreeImpl* tree_impl,
     30     int id,
     31     ScrollbarOrientation orientation)
     32     : ScrollbarLayerImplBase(tree_impl, id, orientation, false),
     33       track_ui_resource_id_(0),
     34       thumb_ui_resource_id_(0),
     35       thumb_thickness_(0),
     36       thumb_length_(0),
     37       track_start_(0),
     38       track_length_(0),
     39       vertical_adjust_(0.f),
     40       scroll_layer_id_(Layer::INVALID_ID) {}
     41 
     42 PaintedScrollbarLayerImpl::~PaintedScrollbarLayerImpl() {}
     43 
     44 scoped_ptr<LayerImpl> PaintedScrollbarLayerImpl::CreateLayerImpl(
     45     LayerTreeImpl* tree_impl) {
     46   return PaintedScrollbarLayerImpl::Create(tree_impl, id(), orientation())
     47       .PassAs<LayerImpl>();
     48 }
     49 
     50 void PaintedScrollbarLayerImpl::PushPropertiesTo(LayerImpl* layer) {
     51   ScrollbarLayerImplBase::PushPropertiesTo(layer);
     52 
     53   PaintedScrollbarLayerImpl* scrollbar_layer =
     54       static_cast<PaintedScrollbarLayerImpl*>(layer);
     55 
     56   scrollbar_layer->SetThumbThickness(thumb_thickness_);
     57   scrollbar_layer->SetThumbLength(thumb_length_);
     58   scrollbar_layer->SetTrackStart(track_start_);
     59   scrollbar_layer->SetTrackLength(track_length_);
     60 
     61   scrollbar_layer->set_track_ui_resource_id(track_ui_resource_id_);
     62   scrollbar_layer->set_thumb_ui_resource_id(thumb_ui_resource_id_);
     63 }
     64 
     65 bool PaintedScrollbarLayerImpl::WillDraw(DrawMode draw_mode,
     66                                   ResourceProvider* resource_provider) {
     67   DCHECK(draw_mode != DRAW_MODE_RESOURCELESS_SOFTWARE);
     68   return LayerImpl::WillDraw(draw_mode, resource_provider);
     69 }
     70 
     71 void PaintedScrollbarLayerImpl::AppendQuads(
     72     QuadSink* quad_sink,
     73     AppendQuadsData* append_quads_data) {
     74   bool premultipled_alpha = true;
     75   bool flipped = false;
     76   gfx::PointF uv_top_left(0.f, 0.f);
     77   gfx::PointF uv_bottom_right(1.f, 1.f);
     78   gfx::Rect bounds_rect(bounds());
     79   gfx::Rect content_bounds_rect(content_bounds());
     80 
     81   SharedQuadState* shared_quad_state =
     82       quad_sink->UseSharedQuadState(CreateSharedQuadState());
     83   AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
     84 
     85   gfx::Rect thumb_quad_rect = ComputeThumbQuadRect();
     86 
     87   ResourceProvider::ResourceId thumb_resource_id =
     88       layer_tree_impl()->ResourceIdForUIResource(thumb_ui_resource_id_);
     89   ResourceProvider::ResourceId track_resource_id =
     90       layer_tree_impl()->ResourceIdForUIResource(track_ui_resource_id_);
     91 
     92   if (thumb_resource_id && !thumb_quad_rect.IsEmpty()) {
     93     gfx::Rect opaque_rect;
     94     const float opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
     95     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
     96     quad->SetNew(shared_quad_state,
     97                  thumb_quad_rect,
     98                  opaque_rect,
     99                  thumb_resource_id,
    100                  premultipled_alpha,
    101                  uv_top_left,
    102                  uv_bottom_right,
    103                  SK_ColorTRANSPARENT,
    104                  opacity,
    105                  flipped);
    106     quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
    107   }
    108 
    109   gfx::Rect track_quad_rect = content_bounds_rect;
    110   if (track_resource_id && !track_quad_rect.IsEmpty()) {
    111     gfx::Rect opaque_rect(contents_opaque() ? track_quad_rect : gfx::Rect());
    112     const float opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
    113     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
    114     quad->SetNew(shared_quad_state,
    115                  track_quad_rect,
    116                  opaque_rect,
    117                  track_resource_id,
    118                  premultipled_alpha,
    119                  uv_top_left,
    120                  uv_bottom_right,
    121                  SK_ColorTRANSPARENT,
    122                  opacity,
    123                  flipped);
    124     quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
    125   }
    126 }
    127 
    128 void PaintedScrollbarLayerImpl::SetThumbThickness(int thumb_thickness) {
    129   if (thumb_thickness_ == thumb_thickness)
    130     return;
    131   thumb_thickness_ = thumb_thickness;
    132   NoteLayerPropertyChanged();
    133 }
    134 
    135 int PaintedScrollbarLayerImpl::ThumbThickness() const {
    136   return thumb_thickness_;
    137 }
    138 
    139 void PaintedScrollbarLayerImpl::SetThumbLength(int thumb_length) {
    140   if (thumb_length_ == thumb_length)
    141     return;
    142   thumb_length_ = thumb_length;
    143   NoteLayerPropertyChanged();
    144 }
    145 
    146 int PaintedScrollbarLayerImpl::ThumbLength() const {
    147   return thumb_length_;
    148 }
    149 
    150 void PaintedScrollbarLayerImpl::SetTrackStart(int track_start) {
    151   if (track_start_ == track_start)
    152     return;
    153   track_start_ = track_start;
    154   NoteLayerPropertyChanged();
    155 }
    156 
    157 int PaintedScrollbarLayerImpl::TrackStart() const {
    158   return track_start_;
    159 }
    160 
    161 void PaintedScrollbarLayerImpl::SetTrackLength(int track_length) {
    162   if (track_length_ == track_length)
    163     return;
    164   track_length_ = track_length;
    165   NoteLayerPropertyChanged();
    166 }
    167 
    168 float PaintedScrollbarLayerImpl::TrackLength() const {
    169   return track_length_ + (orientation() == VERTICAL ? vertical_adjust() : 0);
    170 }
    171 
    172 const char* PaintedScrollbarLayerImpl::LayerTypeAsString() const {
    173   return "cc::PaintedScrollbarLayerImpl";
    174 }
    175 
    176 }  // namespace cc
    177