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36d2135ad0
This was originally implemented in d217a95126
but was not retained when cull rects were removed from the SceneBuilder.
Fixes https://github.com/flutter/flutter/issues/30819
57 lines
1.6 KiB
C++
57 lines
1.6 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 flow {
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TransformLayer::TransformLayer() = default;
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TransformLayer::~TransformLayer() = default;
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void TransformLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
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SkMatrix child_matrix;
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child_matrix.setConcat(matrix, 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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}
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#if defined(OS_FUCHSIA)
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void TransformLayer::UpdateScene(SceneUpdateContext& context) {
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FML_DCHECK(needs_system_composite());
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SceneUpdateContext::Transform transform(context, transform_);
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UpdateSceneChildren(context);
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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 flow
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