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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/flow/layers/backdrop_filter_layer.h"
#include "flutter/flow/testing/layer_test.h"
#include "flutter/flow/testing/mock_layer.h"
#include "flutter/fml/macros.h"
#include "flutter/testing/mock_canvas.h"
#include "third_party/skia/include/core/SkImageFilter.h"
#include "third_party/skia/include/effects/SkImageFilters.h"
namespace flutter {
namespace testing {
using BackdropFilterLayerTest = LayerTest;
#ifndef NDEBUG
TEST_F(BackdropFilterLayerTest, PaintingEmptyLayerDies) {
auto layer = std::make_shared<BackdropFilterLayer>(sk_sp<SkImageFilter>());
layer->Preroll(preroll_context(), SkMatrix());
EXPECT_EQ(layer->paint_bounds(), kEmptyRect);
EXPECT_FALSE(layer->needs_painting());
EXPECT_FALSE(layer->needs_system_composite());
EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
"needs_painting\\(\\)");
}
TEST_F(BackdropFilterLayerTest, PaintBeforePrerollDies) {
const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
const SkPath child_path = SkPath().addRect(child_bounds);
auto mock_layer = std::make_shared<MockLayer>(child_path);
auto layer = std::make_shared<BackdropFilterLayer>(sk_sp<SkImageFilter>());
layer->Add(mock_layer);
EXPECT_EQ(layer->paint_bounds(), kEmptyRect);
EXPECT_DEATH_IF_SUPPORTED(layer->Paint(paint_context()),
"needs_painting\\(\\)");
}
#endif
TEST_F(BackdropFilterLayerTest, EmptyFilter) {
const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 1.0f);
const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
const SkPath child_path = SkPath().addRect(child_bounds);
const SkPaint child_paint = SkPaint(SkColors::kYellow);
auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
auto layer = std::make_shared<BackdropFilterLayer>(nullptr);
layer->Add(mock_layer);
layer->Preroll(preroll_context(), initial_transform);
EXPECT_EQ(layer->paint_bounds(), child_bounds);
EXPECT_TRUE(layer->needs_painting());
EXPECT_EQ(mock_layer->parent_matrix(), initial_transform);
layer->Paint(paint_context());
EXPECT_EQ(
mock_canvas().draw_calls(),
std::vector({MockCanvas::DrawCall{
0, MockCanvas::SaveLayerData{child_bounds, SkPaint(),
nullptr, 1}},
MockCanvas::DrawCall{
1, MockCanvas::DrawPathData{child_path, child_paint}},
MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}}));
}
TEST_F(BackdropFilterLayerTest, SimpleFilter) {
const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 1.0f);
const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 20.5f, 21.5f);
const SkPath child_path = SkPath().addRect(child_bounds);
const SkPaint child_paint = SkPaint(SkColors::kYellow);
auto layer_filter = SkImageFilters::Paint(SkPaint(SkColors::kMagenta));
auto mock_layer = std::make_shared<MockLayer>(child_path, child_paint);
auto layer = std::make_shared<BackdropFilterLayer>(layer_filter);
layer->Add(mock_layer);
layer->Preroll(preroll_context(), initial_transform);
EXPECT_EQ(layer->paint_bounds(), child_bounds);
EXPECT_TRUE(layer->needs_painting());
EXPECT_EQ(mock_layer->parent_matrix(), initial_transform);
layer->Paint(paint_context());
EXPECT_EQ(
mock_canvas().draw_calls(),
std::vector({MockCanvas::DrawCall{
0, MockCanvas::SaveLayerData{child_bounds, SkPaint(),
layer_filter, 1}},
MockCanvas::DrawCall{
1, MockCanvas::DrawPathData{child_path, child_paint}},
MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}}));
}
TEST_F(BackdropFilterLayerTest, MultipleChildren) {
const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 1.0f);
const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 2.5f, 3.5f);
const SkPath child_path1 = SkPath().addRect(child_bounds);
const SkPath child_path2 =
SkPath().addRect(child_bounds.makeOffset(3.0f, 0.0f));
const SkPaint child_paint1 = SkPaint(SkColors::kYellow);
const SkPaint child_paint2 = SkPaint(SkColors::kCyan);
auto layer_filter = SkImageFilters::Paint(SkPaint(SkColors::kMagenta));
auto mock_layer1 = std::make_shared<MockLayer>(child_path1, child_paint1);
auto mock_layer2 = std::make_shared<MockLayer>(child_path2, child_paint2);
auto layer = std::make_shared<BackdropFilterLayer>(layer_filter);
layer->Add(mock_layer1);
layer->Add(mock_layer2);
SkRect children_bounds = child_path1.getBounds();
children_bounds.join(child_path2.getBounds());
layer->Preroll(preroll_context(), initial_transform);
EXPECT_EQ(mock_layer1->paint_bounds(), child_path1.getBounds());
EXPECT_EQ(mock_layer2->paint_bounds(), child_path2.getBounds());
EXPECT_EQ(layer->paint_bounds(), children_bounds);
EXPECT_TRUE(mock_layer1->needs_painting());
EXPECT_TRUE(mock_layer2->needs_painting());
EXPECT_TRUE(layer->needs_painting());
EXPECT_EQ(mock_layer1->parent_matrix(), initial_transform);
EXPECT_EQ(mock_layer2->parent_matrix(), initial_transform);
layer->Paint(paint_context());
EXPECT_EQ(
mock_canvas().draw_calls(),
std::vector({MockCanvas::DrawCall{
0, MockCanvas::SaveLayerData{children_bounds, SkPaint(),
layer_filter, 1}},
MockCanvas::DrawCall{
1, MockCanvas::DrawPathData{child_path1, child_paint1}},
MockCanvas::DrawCall{
1, MockCanvas::DrawPathData{child_path2, child_paint2}},
MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}}));
}
TEST_F(BackdropFilterLayerTest, Nested) {
const SkMatrix initial_transform = SkMatrix::MakeTrans(0.5f, 1.0f);
const SkRect child_bounds = SkRect::MakeLTRB(5.0f, 6.0f, 2.5f, 3.5f);
const SkPath child_path1 = SkPath().addRect(child_bounds);
const SkPath child_path2 =
SkPath().addRect(child_bounds.makeOffset(3.0f, 0.0f));
const SkPaint child_paint1 = SkPaint(SkColors::kYellow);
const SkPaint child_paint2 = SkPaint(SkColors::kCyan);
auto layer_filter1 = SkImageFilters::Paint(SkPaint(SkColors::kMagenta));
auto layer_filter2 = SkImageFilters::Paint(SkPaint(SkColors::kDkGray));
auto mock_layer1 = std::make_shared<MockLayer>(child_path1, child_paint1);
auto mock_layer2 = std::make_shared<MockLayer>(child_path2, child_paint2);
auto layer1 = std::make_shared<BackdropFilterLayer>(layer_filter1);
auto layer2 = std::make_shared<BackdropFilterLayer>(layer_filter2);
layer2->Add(mock_layer2);
layer1->Add(mock_layer1);
layer1->Add(layer2);
SkRect children_bounds = child_path1.getBounds();
children_bounds.join(child_path2.getBounds());
layer1->Preroll(preroll_context(), initial_transform);
EXPECT_EQ(mock_layer1->paint_bounds(), child_path1.getBounds());
EXPECT_EQ(mock_layer2->paint_bounds(), child_path2.getBounds());
EXPECT_EQ(layer1->paint_bounds(), children_bounds);
EXPECT_EQ(layer2->paint_bounds(), mock_layer2->paint_bounds());
EXPECT_TRUE(mock_layer1->needs_painting());
EXPECT_TRUE(mock_layer2->needs_painting());
EXPECT_TRUE(layer1->needs_painting());
EXPECT_TRUE(layer2->needs_painting());
EXPECT_EQ(mock_layer1->parent_matrix(), initial_transform);
EXPECT_EQ(mock_layer2->parent_matrix(), initial_transform);
layer1->Paint(paint_context());
EXPECT_EQ(mock_canvas().draw_calls(),
std::vector(
{MockCanvas::DrawCall{
0, MockCanvas::SaveLayerData{children_bounds, SkPaint(),
layer_filter1, 1}},
MockCanvas::DrawCall{
1, MockCanvas::DrawPathData{child_path1, child_paint1}},
MockCanvas::DrawCall{
1, MockCanvas::SaveLayerData{child_path2.getBounds(),
SkPaint(), layer_filter2, 2}},
MockCanvas::DrawCall{
2, MockCanvas::DrawPathData{child_path2, child_paint2}},
MockCanvas::DrawCall{2, MockCanvas::RestoreData{1}},
MockCanvas::DrawCall{1, MockCanvas::RestoreData{0}}}));
}
TEST_F(BackdropFilterLayerTest, Readback) {
sk_sp<SkImageFilter> no_filter;
auto layer_filter = SkImageFilters::Paint(SkPaint(SkColors::kMagenta));
auto initial_transform = SkMatrix();
// BDF with filter always reads from surface
auto layer1 = std::make_shared<BackdropFilterLayer>(layer_filter);
preroll_context()->surface_needs_readback = false;
layer1->Preroll(preroll_context(), initial_transform);
EXPECT_TRUE(preroll_context()->surface_needs_readback);
// BDF with no filter does not read from surface itself
auto layer2 = std::make_shared<BackdropFilterLayer>(no_filter);
preroll_context()->surface_needs_readback = false;
layer2->Preroll(preroll_context(), initial_transform);
EXPECT_FALSE(preroll_context()->surface_needs_readback);
// BDF with no filter does not block prior readback value
preroll_context()->surface_needs_readback = true;
layer2->Preroll(preroll_context(), initial_transform);
EXPECT_TRUE(preroll_context()->surface_needs_readback);
// BDF with no filter blocks child with readback
auto mock_layer =
std::make_shared<MockLayer>(SkPath(), SkPaint(), false, false, true);
layer2->Add(mock_layer);
preroll_context()->surface_needs_readback = false;
layer2->Preroll(preroll_context(), initial_transform);
EXPECT_FALSE(preroll_context()->surface_needs_readback);
}
} // namespace testing
} // namespace flutter