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ad8ccf47b1
* [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.
80 lines
2.6 KiB
C++
80 lines
2.6 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/transform_layer.h"
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namespace flutter {
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TransformLayer::TransformLayer(const SkMatrix& transform)
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: transform_(transform) {
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// Checks (in some degree) that SkMatrix transform_ is valid and initialized.
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//
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// If transform_ is uninitialized, this assert may look flaky as it doesn't
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// fail all the time, and some rerun may make it pass. But don't ignore it and
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// just rerun the test if this is triggered, since even a flaky failure here
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// may signify a potentially big problem in the code.
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//
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// We have to write this flaky test because there is no reliable way to test
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// whether a variable is initialized or not in C++.
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FML_DCHECK(transform_.isFinite());
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if (!transform_.isFinite()) {
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FML_LOG(ERROR) << "TransformLayer is constructed with an invalid matrix.";
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transform_.setIdentity();
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}
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}
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void TransformLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
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TRACE_EVENT0("flutter", "TransformLayer::Preroll");
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SkMatrix child_matrix;
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child_matrix.setConcat(matrix, transform_);
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context->mutators_stack.PushTransform(transform_);
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SkRect previous_cull_rect = context->cull_rect;
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SkMatrix inverse_transform_;
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// Perspective projections don't produce rectangles that are useful for
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// culling for some reason.
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if (!transform_.hasPerspective() && transform_.invert(&inverse_transform_)) {
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inverse_transform_.mapRect(&context->cull_rect);
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} else {
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context->cull_rect = kGiantRect;
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}
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SkRect child_paint_bounds = SkRect::MakeEmpty();
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PrerollChildren(context, child_matrix, &child_paint_bounds);
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transform_.mapRect(&child_paint_bounds);
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set_paint_bounds(child_paint_bounds);
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context->cull_rect = previous_cull_rect;
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context->mutators_stack.Pop();
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}
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#if defined(OS_FUCHSIA)
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void TransformLayer::UpdateScene(SceneUpdateContext& context) {
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TRACE_EVENT0("flutter", "TransformLayer::UpdateScene");
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FML_DCHECK(needs_system_composite());
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if (!transform_.isIdentity()) {
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SceneUpdateContext::Transform transform(context, transform_);
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UpdateSceneChildren(context);
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} else {
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UpdateSceneChildren(context);
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}
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}
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#endif // defined(OS_FUCHSIA)
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void TransformLayer::Paint(PaintContext& context) const {
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TRACE_EVENT0("flutter", "TransformLayer::Paint");
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FML_DCHECK(needs_painting());
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SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
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context.internal_nodes_canvas->concat(transform_);
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PaintChildren(context);
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}
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} // namespace flutter
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