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* [fuchsia] Add labels to Scenic nodes. * [fuchsia] Skip creating Scenic nodes for identity Transforms. * [fuchsia] Assign elevation to Scenic nodes based on paint order. * [fuchsia] Create Scenic OpacityNodes at leaf nodes. * [fuchsia] Composite PhysicalShapeLayers using Skia, except when they need to float above child views. In that case, they will still need to be pulled into separate Scenic nodes to be composited on top of the child view[s]. * [fuchsia] Add tests for Fuchsia-specific layer behavior. Inspect commands going to Scenic and make sure they match what is expected. Also, restructure code to need less member variables, and other cleanups based on review feedback.
124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/flow/layers/opacity_layer.h"
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#include "flutter/fml/trace_event.h"
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#include "third_party/skia/include/core/SkPaint.h"
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namespace flutter {
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OpacityLayer::OpacityLayer(SkAlpha alpha, const SkPoint& offset)
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: alpha_(alpha), offset_(offset) {
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// Ensure OpacityLayer has only one direct child.
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//
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// This is needed to ensure that retained rendering can always be applied to
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// save the costly saveLayer.
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//
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// Any children will be actually added as children of this empty
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// ContainerLayer.
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ContainerLayer::Add(std::make_shared<ContainerLayer>());
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}
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void OpacityLayer::Add(std::shared_ptr<Layer> layer) {
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GetChildContainer()->Add(std::move(layer));
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}
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void OpacityLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
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TRACE_EVENT0("flutter", "OpacityLayer::Preroll");
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ContainerLayer* container = GetChildContainer();
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FML_DCHECK(!container->layers().empty()); // OpacityLayer can't be a leaf.
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const bool parent_is_opaque = context->is_opaque;
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SkMatrix child_matrix = matrix;
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child_matrix.postTranslate(offset_.fX, offset_.fY);
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context->is_opaque = parent_is_opaque && (alpha_ == SK_AlphaOPAQUE);
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context->mutators_stack.PushTransform(
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SkMatrix::MakeTrans(offset_.fX, offset_.fY));
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context->mutators_stack.PushOpacity(alpha_);
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Layer::AutoPrerollSaveLayerState save =
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Layer::AutoPrerollSaveLayerState::Create(context);
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ContainerLayer::Preroll(context, child_matrix);
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context->mutators_stack.Pop();
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context->mutators_stack.Pop();
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context->is_opaque = parent_is_opaque;
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{
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set_paint_bounds(paint_bounds().makeOffset(offset_.fX, offset_.fY));
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if (!context->has_platform_view && context->raster_cache &&
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SkRect::Intersects(context->cull_rect, paint_bounds())) {
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SkMatrix ctm = child_matrix;
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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ctm = RasterCache::GetIntegralTransCTM(ctm);
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#endif
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context->raster_cache->Prepare(context, container, ctm);
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}
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}
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}
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void OpacityLayer::Paint(PaintContext& context) const {
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TRACE_EVENT0("flutter", "OpacityLayer::Paint");
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FML_DCHECK(needs_painting());
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SkPaint paint;
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paint.setAlpha(alpha_);
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SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
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context.internal_nodes_canvas->translate(offset_.fX, offset_.fY);
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#ifndef SUPPORT_FRACTIONAL_TRANSLATION
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context.internal_nodes_canvas->setMatrix(RasterCache::GetIntegralTransCTM(
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context.leaf_nodes_canvas->getTotalMatrix()));
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#endif
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if (context.raster_cache) {
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ContainerLayer* container = GetChildContainer();
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const SkMatrix& ctm = context.leaf_nodes_canvas->getTotalMatrix();
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RasterCacheResult child_cache = context.raster_cache->Get(container, ctm);
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if (child_cache.is_valid()) {
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child_cache.draw(*context.leaf_nodes_canvas, &paint);
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return;
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}
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}
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// Skia may clip the content with saveLayerBounds (although it's not a
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// guaranteed clip). So we have to provide a big enough saveLayerBounds. To do
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// so, we first remove the offset from paint bounds since it's already in the
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// matrix. Then we round out the bounds because of our
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// RasterCache::GetIntegralTransCTM optimization.
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//
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// Note that the following lines are only accessible when the raster cache is
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// not available (e.g., when we're using the software backend in golden
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// tests).
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SkRect saveLayerBounds;
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paint_bounds()
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.makeOffset(-offset_.fX, -offset_.fY)
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.roundOut(&saveLayerBounds);
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Layer::AutoSaveLayer save_layer =
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Layer::AutoSaveLayer::Create(context, saveLayerBounds, &paint);
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PaintChildren(context);
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}
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#if defined(OS_FUCHSIA)
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void OpacityLayer::UpdateScene(SceneUpdateContext& context) {
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float saved_alpha = context.alphaf();
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context.set_alphaf(context.alphaf() * (alpha_ / 255.f));
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ContainerLayer::UpdateScene(context);
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context.set_alphaf(saved_alpha);
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}
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#endif // defined(OS_FUCHSIA)
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ContainerLayer* OpacityLayer::GetChildContainer() const {
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FML_DCHECK(layers().size() == 1);
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return static_cast<ContainerLayer*>(layers()[0].get());
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}
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} // namespace flutter
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