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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/layers/ui_resource_layer.h"
#include "cc/animation/animation_host.h"
#include "cc/resources/scoped_ui_resource.h"
#include "cc/resources/ui_resource_manager.h"
#include "cc/test/fake_layer_tree_host.h"
#include "cc/test/layer_tree_impl_test_base.h"
#include "cc/test/stub_layer_tree_host_single_thread_client.h"
#include "cc/trees/single_thread_proxy.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
using ::testing::Mock;
using ::testing::_;
using ::testing::AtLeast;
using ::testing::AnyNumber;
namespace cc {
namespace {
class TestUIResourceLayer : public UIResourceLayer {
public:
static scoped_refptr<TestUIResourceLayer> Create() {
return base::WrapRefCounted(new TestUIResourceLayer());
}
using UIResourceLayer::resource_id;
using UIResourceLayer::HasDrawableContent;
protected:
TestUIResourceLayer() : UIResourceLayer() { SetIsDrawable(true); }
~TestUIResourceLayer() override = default;
};
class UIResourceLayerTest : public testing::Test {
protected:
void TearDown() override {
Mock::VerifyAndClearExpectations(layer_tree_host());
}
FakeLayerTreeHost* layer_tree_host() { return layer_impl_test_.host(); }
private:
LayerTreeImplTestBase layer_impl_test_;
};
TEST_F(UIResourceLayerTest, SetBitmap) {
scoped_refptr<UIResourceLayer> test_layer = TestUIResourceLayer::Create();
ASSERT_TRUE(test_layer.get());
test_layer->SetBounds(gfx::Size(100, 100));
layer_tree_host()->SetRootLayer(test_layer);
Mock::VerifyAndClearExpectations(layer_tree_host());
EXPECT_EQ(test_layer->layer_tree_host(), layer_tree_host());
test_layer->Update();
EXPECT_FALSE(test_layer->draws_content());
SkBitmap bitmap;
bitmap.allocN32Pixels(10, 10);
bitmap.setImmutable();
test_layer->SetBitmap(bitmap);
test_layer->Update();
EXPECT_TRUE(test_layer->draws_content());
}
TEST_F(UIResourceLayerTest, SetUIResourceId) {
scoped_refptr<TestUIResourceLayer> test_layer = TestUIResourceLayer::Create();
ASSERT_TRUE(test_layer.get());
test_layer->SetBounds(gfx::Size(100, 100));
layer_tree_host()->SetRootLayer(test_layer);
Mock::VerifyAndClearExpectations(layer_tree_host());
EXPECT_EQ(test_layer->layer_tree_host(), layer_tree_host());
test_layer->Update();
EXPECT_FALSE(test_layer->draws_content());
bool is_opaque = false;
std::unique_ptr<ScopedUIResource> resource =
ScopedUIResource::Create(layer_tree_host()->GetUIResourceManager(),
UIResourceBitmap(gfx::Size(10, 10), is_opaque));
test_layer->SetUIResourceId(resource->id());
test_layer->Update();
EXPECT_TRUE(test_layer->draws_content());
// ID is preserved even when you set ID first and attach it to the tree.
layer_tree_host()->SetRootLayer(nullptr);
std::unique_ptr<ScopedUIResource> shared_resource =
ScopedUIResource::Create(layer_tree_host()->GetUIResourceManager(),
UIResourceBitmap(gfx::Size(5, 5), is_opaque));
test_layer->SetUIResourceId(shared_resource->id());
layer_tree_host()->SetRootLayer(test_layer);
EXPECT_EQ(shared_resource->id(), test_layer->resource_id());
EXPECT_TRUE(test_layer->draws_content());
}
TEST_F(UIResourceLayerTest, BitmapClearedOnSetUIResourceId) {
scoped_refptr<TestUIResourceLayer> test_layer = TestUIResourceLayer::Create();
ASSERT_TRUE(test_layer.get());
test_layer->SetBounds(gfx::Size(100, 100));
EXPECT_FALSE(test_layer->HasDrawableContent());
SkBitmap bitmap;
bitmap.allocN32Pixels(10, 10);
bitmap.setImmutable();
ASSERT_FALSE(bitmap.isNull());
ASSERT_TRUE(bitmap.pixelRef()->unique());
// Without a layer tree, the only additional reference is in UIResourceLayer.
test_layer->SetBitmap(bitmap);
ASSERT_FALSE(bitmap.pixelRef()->unique());
// Also, there's no drawable content due to the lack of a LTH.
EXPECT_FALSE(test_layer->HasDrawableContent());
test_layer->SetUIResourceId(0);
EXPECT_TRUE(bitmap.pixelRef()->unique());
EXPECT_FALSE(test_layer->HasDrawableContent());
// Add to a layer tree; now the UIResourceManager holds onto a ref
// indefinitely.
{
LayerTreeImplTestBase impl;
impl.host()->SetRootLayer(test_layer);
test_layer->SetBitmap(bitmap);
EXPECT_FALSE(bitmap.pixelRef()->unique());
EXPECT_TRUE(test_layer->HasDrawableContent());
test_layer->SetUIResourceId(0);
EXPECT_FALSE(bitmap.pixelRef()->unique());
EXPECT_FALSE(test_layer->HasDrawableContent());
}
// After the layer tree/resource manager are destroyed, refs are back to 1.
test_layer->SetUIResourceId(0);
EXPECT_TRUE(bitmap.pixelRef()->unique());
EXPECT_FALSE(test_layer->HasDrawableContent());
}
TEST_F(UIResourceLayerTest, SharedBitmap) {
SkBitmap bitmap;
bitmap.allocN32Pixels(10, 10);
bitmap.setImmutable();
// The SkPixelRef is what's important, not the SkBitmap itself.
SkBitmap bitmap_copy = bitmap;
scoped_refptr<TestUIResourceLayer> layer1 = TestUIResourceLayer::Create();
layer_tree_host()->SetRootLayer(layer1);
layer1->SetBitmap(bitmap);
bitmap.reset();
layer1->Update();
EXPECT_TRUE(layer1->draws_content());
const auto resource_id = layer1->resource_id();
// Second layer, same LTH. Resource is shared (has same ID).
scoped_refptr<TestUIResourceLayer> layer2 = TestUIResourceLayer::Create();
layer_tree_host()->SetRootLayer(layer2);
layer2->SetBitmap(bitmap_copy);
layer2->Update();
EXPECT_TRUE(layer2->draws_content());
EXPECT_EQ(resource_id, layer2->resource_id());
// Change bitmap, different resource id.
SkBitmap other_bitmap;
other_bitmap.allocN32Pixels(12, 12);
other_bitmap.setImmutable();
layer2->SetBitmap(other_bitmap);
EXPECT_NE(resource_id, layer2->resource_id());
// Switch layer to different LTH. ID is in a new namespace (LTH), so it may
// still be the same. We can make sure it's using the same shared bitmap by
// verifying that whatever ID it has, it changes away from and back to when we
// change the shared bitmap to something else then back to the original.
LayerTreeImplTestBase impl;
impl.host()->SetRootLayer(layer1);
layer1->Update();
EXPECT_TRUE(layer1->draws_content());
const auto other_lth_resource_id = layer1->resource_id();
layer1->SetBitmap(other_bitmap);
EXPECT_NE(other_lth_resource_id, layer1->resource_id());
layer1->SetBitmap(bitmap_copy);
EXPECT_EQ(other_lth_resource_id, layer1->resource_id());
}
TEST_F(UIResourceLayerTest, SharedBitmapCacheSizeLimit) {
scoped_refptr<TestUIResourceLayer> layer = TestUIResourceLayer::Create();
layer_tree_host()->SetRootLayer(layer);
// Number of bitmaps that are created then get their references dropped.
constexpr size_t kDroppedResources = 100u;
// Populate the shared bitmap cache.
auto* manager = layer_tree_host()->GetUIResourceManager();
while (manager->owned_shared_resources_size_for_test() < kDroppedResources) {
SkBitmap bitmap;
bitmap.allocN32Pixels(10, 10);
bitmap.setImmutable();
layer->SetBitmap(bitmap);
}
// No eviction because bitmaps are references by UIResourcesRequests.
EXPECT_EQ(manager->owned_shared_resources_size_for_test(), kDroppedResources);
// Pretend UIResourcesRequests are processed to drop bitmap references.
manager->TakeUIResourcesRequests();
// Create one more shared bitmap resource and the eviction happens.
SkBitmap bitmap;
bitmap.allocN32Pixels(10, 10);
bitmap.setImmutable();
layer->SetBitmap(bitmap);
// The cache should trimmed down.
EXPECT_EQ(manager->owned_shared_resources_size_for_test(), 1u);
}
} // namespace
} // namespace cc
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