1 // Copyright 2013 The Flutter 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 "flutter/flow/layers/layer_tree.h"
6
7 #include "flutter/flow/layers/layer.h"
8 #include "flutter/fml/trace_event.h"
9 #include "third_party/skia/include/core/SkPictureRecorder.h"
10 #include "third_party/skia/include/utils/SkNWayCanvas.h"
11
12 namespace flutter {
13
LayerTree()14 LayerTree::LayerTree()
15 : frame_size_{},
16 rasterizer_tracing_threshold_(0),
17 checkerboard_raster_cache_images_(false),
18 checkerboard_offscreen_layers_(false) {}
19
20 LayerTree::~LayerTree() = default;
21
RecordBuildTime(fml::TimePoint start)22 void LayerTree::RecordBuildTime(fml::TimePoint start) {
23 build_start_ = start;
24 build_finish_ = fml::TimePoint::Now();
25 }
26
Preroll(CompositorContext::ScopedFrame & frame,bool ignore_raster_cache)27 void LayerTree::Preroll(CompositorContext::ScopedFrame& frame,
28 bool ignore_raster_cache) {
29 TRACE_EVENT0("flutter", "LayerTree::Preroll");
30 SkColorSpace* color_space =
31 frame.canvas() ? frame.canvas()->imageInfo().colorSpace() : nullptr;
32 frame.context().raster_cache().SetCheckboardCacheImages(
33 checkerboard_raster_cache_images_);
34 MutatorsStack stack;
35 PrerollContext context = {
36 ignore_raster_cache ? nullptr : &frame.context().raster_cache(),
37 frame.gr_context(),
38 frame.view_embedder(),
39 stack,
40 color_space,
41 kGiantRect,
42 frame.context().raster_time(),
43 frame.context().ui_time(),
44 frame.context().texture_registry(),
45 checkerboard_offscreen_layers_};
46
47 root_layer_->Preroll(&context, frame.root_surface_transformation());
48 }
49
50 #if defined(OS_FUCHSIA)
UpdateScene(SceneUpdateContext & context,scenic::ContainerNode & container)51 void LayerTree::UpdateScene(SceneUpdateContext& context,
52 scenic::ContainerNode& container) {
53 TRACE_EVENT0("flutter", "LayerTree::UpdateScene");
54 const auto& metrics = context.metrics();
55 SceneUpdateContext::Transform transform(context, // context
56 1.0f / metrics->scale_x, // X
57 1.0f / metrics->scale_y, // Y
58 1.0f / metrics->scale_z // Z
59 );
60 SceneUpdateContext::Frame frame(
61 context,
62 SkRRect::MakeRect(
63 SkRect::MakeWH(frame_size_.width(), frame_size_.height())),
64 SK_ColorTRANSPARENT);
65 if (root_layer_->needs_system_composite()) {
66 root_layer_->UpdateScene(context);
67 }
68 if (root_layer_->needs_painting()) {
69 frame.AddPaintLayer(root_layer_.get());
70 }
71 container.AddChild(transform.entity_node());
72 }
73 #endif
74
Paint(CompositorContext::ScopedFrame & frame,bool ignore_raster_cache) const75 void LayerTree::Paint(CompositorContext::ScopedFrame& frame,
76 bool ignore_raster_cache) const {
77 TRACE_EVENT0("flutter", "LayerTree::Paint");
78 SkISize canvas_size = frame.canvas()->getBaseLayerSize();
79 SkNWayCanvas internal_nodes_canvas(canvas_size.width(), canvas_size.height());
80 internal_nodes_canvas.addCanvas(frame.canvas());
81 if (frame.view_embedder() != nullptr) {
82 auto overlay_canvases = frame.view_embedder()->GetCurrentCanvases();
83 for (size_t i = 0; i < overlay_canvases.size(); i++) {
84 internal_nodes_canvas.addCanvas(overlay_canvases[i]);
85 }
86 }
87
88 Layer::PaintContext context = {
89 (SkCanvas*)&internal_nodes_canvas,
90 frame.canvas(),
91 frame.gr_context(),
92 frame.view_embedder(),
93 frame.context().raster_time(),
94 frame.context().ui_time(),
95 frame.context().texture_registry(),
96 ignore_raster_cache ? nullptr : &frame.context().raster_cache(),
97 checkerboard_offscreen_layers_};
98
99 if (root_layer_->needs_painting())
100 root_layer_->Paint(context);
101 }
102
Flatten(const SkRect & bounds)103 sk_sp<SkPicture> LayerTree::Flatten(const SkRect& bounds) {
104 TRACE_EVENT0("flutter", "LayerTree::Flatten");
105
106 SkPictureRecorder recorder;
107 auto* canvas = recorder.beginRecording(bounds);
108
109 if (!canvas) {
110 return nullptr;
111 }
112
113 MutatorsStack unused_stack;
114 const Stopwatch unused_stopwatch;
115 TextureRegistry unused_texture_registry;
116 SkMatrix root_surface_transformation;
117 // No root surface transformation. So assume identity.
118 root_surface_transformation.reset();
119
120 PrerollContext preroll_context{
121 nullptr, // raster_cache (don't consult the cache)
122 nullptr, // gr_context (used for the raster cache)
123 nullptr, // external view embedder
124 unused_stack, // mutator stack
125 nullptr, // SkColorSpace* dst_color_space
126 kGiantRect, // SkRect cull_rect
127 unused_stopwatch, // frame time (dont care)
128 unused_stopwatch, // engine time (dont care)
129 unused_texture_registry, // texture registry (not supported)
130 false, // checkerboard_offscreen_layers
131 };
132
133 SkISize canvas_size = canvas->getBaseLayerSize();
134 SkNWayCanvas internal_nodes_canvas(canvas_size.width(), canvas_size.height());
135 internal_nodes_canvas.addCanvas(canvas);
136
137 Layer::PaintContext paint_context = {
138 (SkCanvas*)&internal_nodes_canvas,
139 canvas, // canvas
140 nullptr,
141 nullptr,
142 unused_stopwatch, // frame time (dont care)
143 unused_stopwatch, // engine time (dont care)
144 unused_texture_registry, // texture registry (not supported)
145 nullptr, // raster cache
146 false // checkerboard offscreen layers
147 };
148
149 // Even if we don't have a root layer, we still need to create an empty
150 // picture.
151 if (root_layer_) {
152 root_layer_->Preroll(&preroll_context, root_surface_transformation);
153 // The needs painting flag may be set after the preroll. So check it after.
154 if (root_layer_->needs_painting()) {
155 root_layer_->Paint(paint_context);
156 }
157 }
158
159 return recorder.finishRecordingAsPicture();
160 }
161
162 } // namespace flutter
163