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layer_position_constraint_unittest.cc
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layer_position_constraint_unittest.cc
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// Copyright 2013 The Chromium 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 "cc/layers/layer_position_constraint.h"
#include <vector>
#include "cc/layers/layer_impl.h"
#include "cc/test/fake_impl_proxy.h"
#include "cc/test/fake_layer_tree_host_impl.h"
#include "cc/test/geometry_test_utils.h"
#include "cc/test/test_shared_bitmap_manager.h"
#include "cc/trees/layer_tree_host_common.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cc {
namespace {
void SetLayerPropertiesForTesting(LayerImpl* layer,
const gfx::Transform& transform,
const gfx::Point3F& transform_origin,
const gfx::PointF& position,
const gfx::Size& bounds,
bool flatten_transform) {
layer->SetTransform(transform);
layer->SetTransformOrigin(transform_origin);
layer->SetPosition(position);
layer->SetBounds(bounds);
layer->SetShouldFlattenTransform(flatten_transform);
layer->SetContentBounds(bounds);
}
void ExecuteCalculateDrawProperties(LayerImpl* root_layer,
float device_scale_factor,
float page_scale_factor,
LayerImpl* page_scale_application_layer,
bool can_use_lcd_text) {
gfx::Transform identity_matrix;
std::vector<LayerImpl*> dummy_render_surface_layer_list;
LayerImpl* scroll_layer = root_layer->children()[0];
gfx::Size device_viewport_size =
gfx::Size(root_layer->bounds().width() * device_scale_factor,
root_layer->bounds().height() * device_scale_factor);
// We are probably not testing what is intended if the scroll_layer bounds are
// empty.
DCHECK(!scroll_layer->bounds().IsEmpty());
LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
root_layer, device_viewport_size, &dummy_render_surface_layer_list);
inputs.device_scale_factor = device_scale_factor;
inputs.page_scale_factor = page_scale_factor;
inputs.page_scale_application_layer = page_scale_application_layer;
inputs.can_use_lcd_text = can_use_lcd_text;
LayerTreeHostCommon::CalculateDrawProperties(&inputs);
}
void ExecuteCalculateDrawProperties(LayerImpl* root_layer) {
LayerImpl* page_scale_application_layer = nullptr;
ExecuteCalculateDrawProperties(
root_layer, 1.f, 1.f, page_scale_application_layer, false);
}
class LayerPositionConstraintTest : public testing::Test {
public:
LayerPositionConstraintTest() : host_impl_(&proxy_, &shared_bitmap_manager_) {
root_ = CreateTreeForTest();
scroll_ = root_->children()[0];
fixed_to_top_left_.set_is_fixed_position(true);
fixed_to_bottom_right_.set_is_fixed_position(true);
fixed_to_bottom_right_.set_is_fixed_to_right_edge(true);
fixed_to_bottom_right_.set_is_fixed_to_bottom_edge(true);
}
scoped_ptr<LayerImpl> CreateTreeForTest() {
scoped_ptr<LayerImpl> root =
LayerImpl::Create(host_impl_.active_tree(), 42);
scoped_ptr<LayerImpl> scroll_layer =
LayerImpl::Create(host_impl_.active_tree(), 1);
scoped_ptr<LayerImpl> child =
LayerImpl::Create(host_impl_.active_tree(), 2);
scoped_ptr<LayerImpl> grand_child =
LayerImpl::Create(host_impl_.active_tree(), 3);
scoped_ptr<LayerImpl> great_grand_child =
LayerImpl::Create(host_impl_.active_tree(), 4);
gfx::Transform IdentityMatrix;
gfx::Point3F transform_origin;
gfx::PointF position;
gfx::Size bounds(200, 200);
gfx::Size clip_bounds(100, 100);
SetLayerPropertiesForTesting(scroll_layer.get(),
IdentityMatrix,
transform_origin,
position,
bounds,
true);
SetLayerPropertiesForTesting(
child.get(), IdentityMatrix, transform_origin, position, bounds, true);
SetLayerPropertiesForTesting(grand_child.get(),
IdentityMatrix,
transform_origin,
position,
bounds,
true);
SetLayerPropertiesForTesting(great_grand_child.get(),
IdentityMatrix,
transform_origin,
position,
bounds,
true);
root->SetBounds(clip_bounds);
scroll_layer->SetScrollClipLayer(root->id());
child->SetScrollClipLayer(root->id());
grand_child->SetScrollClipLayer(root->id());
grand_child->AddChild(great_grand_child.Pass());
child->AddChild(grand_child.Pass());
scroll_layer->AddChild(child.Pass());
root->AddChild(scroll_layer.Pass());
return root.Pass();
}
protected:
FakeImplProxy proxy_;
TestSharedBitmapManager shared_bitmap_manager_;
FakeLayerTreeHostImpl host_impl_;
scoped_ptr<LayerImpl> root_;
LayerImpl* scroll_;
LayerPositionConstraint fixed_to_top_left_;
LayerPositionConstraint fixed_to_bottom_right_;
};
namespace {
void SetFixedContainerSizeDelta(LayerImpl* scroll_layer,
const gfx::Vector2d& delta) {
DCHECK(scroll_layer);
DCHECK(scroll_layer->scrollable());
LayerImpl* container_layer = scroll_layer->scroll_clip_layer();
container_layer->SetBoundsDelta(delta);
}
} // namespace
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithDirectContainer) {
// This test checks for correct scroll compensation when the fixed-position
// container is the direct parent of the fixed-position layer.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
child->SetIsContainerForFixedPositionLayers(true);
grand_child->SetPositionConstraint(fixed_to_top_left_);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
gfx::Transform expected_grand_child_transform = expected_child_transform;
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 2: scroll delta of 10, 10
child->SetScrollDelta(gfx::Vector2d(10, 10));
ExecuteCalculateDrawProperties(root_.get());
// Here the child is affected by scroll delta, but the fixed position
// grand_child should not be affected.
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, -10.0);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_grand_child_transform.MakeIdentity();
// Apply size delta from the child(container) layer.
expected_grand_child_transform.Translate(20.0, 20.0);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithTransformedDirectContainer) {
// This test checks for correct scroll compensation when the fixed-position
// container is the direct parent of the fixed-position layer, but that
// container is transformed. In this case, the fixed position element
// inherits the container's transform, but the scroll delta that has to be
// undone should not be affected by that transform.
//
// Transforms are in general non-commutative; using something like a
// non-uniform scale helps to verify that translations and non-uniform scales
// are applied in the correct order.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
// This scale will cause child and grand_child to be effectively 200 x 800
// with respect to the render target.
gfx::Transform non_uniform_scale;
non_uniform_scale.Scale(2.0, 8.0);
child->SetTransform(non_uniform_scale);
child->SetIsContainerForFixedPositionLayers(true);
grand_child->SetPositionConstraint(fixed_to_top_left_);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
expected_child_transform.PreconcatTransform(non_uniform_scale);
gfx::Transform expected_grand_child_transform = expected_child_transform;
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 2: scroll delta of 10, 20
child->SetScrollDelta(gfx::Vector2d(10, 20));
ExecuteCalculateDrawProperties(root_.get());
// The child should be affected by scroll delta, but the fixed position
// grand_child should not be affected.
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, -20.0); // scroll delta
expected_child_transform.PreconcatTransform(non_uniform_scale);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_grand_child_transform.MakeIdentity();
// Apply child layer transform.
expected_grand_child_transform.PreconcatTransform(non_uniform_scale);
// Apply size delta from the child(container) layer.
expected_grand_child_transform.Translate(20.0, 20.0);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithDistantContainer) {
// This test checks for correct scroll compensation when the fixed-position
// container is NOT the direct parent of the fixed-position layer.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
LayerImpl* great_grand_child = grand_child->children()[0];
child->SetIsContainerForFixedPositionLayers(true);
grand_child->SetPosition(gfx::PointF(8.f, 6.f));
great_grand_child->SetPositionConstraint(fixed_to_top_left_);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
gfx::Transform expected_grand_child_transform;
expected_grand_child_transform.Translate(8.0, 6.0);
gfx::Transform expected_great_grand_child_transform =
expected_grand_child_transform;
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 2: scroll delta of 10, 10
child->SetScrollDelta(gfx::Vector2d(10, 10));
ExecuteCalculateDrawProperties(root_.get());
// Here the child and grand_child are affected by scroll delta, but the fixed
// position great_grand_child should not be affected.
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, -10.0);
expected_grand_child_transform.MakeIdentity();
expected_grand_child_transform.Translate(-2.0, -4.0);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
great_grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_great_grand_child_transform.MakeIdentity();
// Apply size delta from the child(container) layer.
expected_great_grand_child_transform.Translate(20.0, 20.0);
// Apply layer position from the grand child layer.
expected_great_grand_child_transform.Translate(8.0, 6.0);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithDistantContainerAndTransforms) {
// This test checks for correct scroll compensation when the fixed-position
// container is NOT the direct parent of the fixed-position layer, and the
// hierarchy has various transforms that have to be processed in the correct
// order.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
LayerImpl* great_grand_child = grand_child->children()[0];
gfx::Transform rotation_about_z;
rotation_about_z.RotateAboutZAxis(90.0);
child->SetIsContainerForFixedPositionLayers(true);
child->SetTransform(rotation_about_z);
grand_child->SetPosition(gfx::PointF(8.f, 6.f));
grand_child->SetTransform(rotation_about_z);
// great_grand_child is positioned upside-down with respect to the render
// target.
great_grand_child->SetPositionConstraint(fixed_to_top_left_);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
expected_child_transform.PreconcatTransform(rotation_about_z);
gfx::Transform expected_grand_child_transform;
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // child's local transform is inherited
// translation because of position occurs before layer's local transform.
expected_grand_child_transform.Translate(8.0, 6.0);
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // grand_child's local transform
gfx::Transform expected_great_grand_child_transform =
expected_grand_child_transform;
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 2: scroll delta of 10, 20
child->SetScrollDelta(gfx::Vector2d(10, 20));
ExecuteCalculateDrawProperties(root_.get());
// Here the child and grand_child are affected by scroll delta, but the fixed
// position great_grand_child should not be affected.
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, -20.0); // scroll delta
expected_child_transform.PreconcatTransform(rotation_about_z);
expected_grand_child_transform.MakeIdentity();
expected_grand_child_transform.Translate(
-10.0, -20.0); // child's scroll delta is inherited
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // child's local transform is inherited
// translation because of position occurs before layer's local transform.
expected_grand_child_transform.Translate(8.0, 6.0);
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // grand_child's local transform
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
great_grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_great_grand_child_transform.MakeIdentity();
// Apply child layer transform.
expected_great_grand_child_transform.PreconcatTransform(rotation_about_z);
// Apply size delta from the child(container) layer.
expected_great_grand_child_transform.Translate(20.0, 20.0);
// Apply layer position from the grand child layer.
expected_great_grand_child_transform.Translate(8.0, 6.0);
// Apply grand child layer transform.
expected_great_grand_child_transform.PreconcatTransform(rotation_about_z);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithMultipleScrollDeltas) {
// This test checks for correct scroll compensation when the fixed-position
// container has multiple ancestors that have nonzero scroll delta before
// reaching the space where the layer is fixed. In this test, each scroll
// delta occurs in a different space because of each layer's local transform.
// This test checks for correct scroll compensation when the fixed-position
// container is NOT the direct parent of the fixed-position layer, and the
// hierarchy has various transforms that have to be processed in the correct
// order.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
LayerImpl* great_grand_child = grand_child->children()[0];
gfx::Transform rotation_about_z;
rotation_about_z.RotateAboutZAxis(90.0);
child->SetIsContainerForFixedPositionLayers(true);
child->SetTransform(rotation_about_z);
grand_child->SetPosition(gfx::PointF(8.f, 6.f));
grand_child->SetTransform(rotation_about_z);
// great_grand_child is positioned upside-down with respect to the render
// target.
great_grand_child->SetPositionConstraint(fixed_to_top_left_);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
expected_child_transform.PreconcatTransform(rotation_about_z);
gfx::Transform expected_grand_child_transform;
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // child's local transform is inherited
// translation because of position occurs before layer's local transform.
expected_grand_child_transform.Translate(8.0, 6.0);
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // grand_child's local transform
gfx::Transform expected_great_grand_child_transform =
expected_grand_child_transform;
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 2: scroll delta of 10, 20
child->SetScrollDelta(gfx::Vector2d(10, 0));
grand_child->SetScrollDelta(gfx::Vector2d(5, 0));
ExecuteCalculateDrawProperties(root_.get());
// Here the child and grand_child are affected by scroll delta, but the fixed
// position great_grand_child should not be affected.
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, 0.0); // scroll delta
expected_child_transform.PreconcatTransform(rotation_about_z);
expected_grand_child_transform.MakeIdentity();
expected_grand_child_transform.Translate(
-10.0, 0.0); // child's scroll delta is inherited
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // child's local transform is inherited
expected_grand_child_transform.Translate(-5.0,
0.0); // grand_child's scroll delta
// translation because of position occurs before layer's local transform.
expected_grand_child_transform.Translate(8.0, 6.0);
expected_grand_child_transform.PreconcatTransform(
rotation_about_z); // grand_child's local transform
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
great_grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_great_grand_child_transform.MakeIdentity();
// Apply child layer transform.
expected_great_grand_child_transform.PreconcatTransform(rotation_about_z);
// Apply size delta from the child(container) layer.
expected_great_grand_child_transform.Translate(20.0, 20.0);
// Apply layer position from the grand child layer.
expected_great_grand_child_transform.Translate(8.0, 6.0);
// Apply grand child layer transform.
expected_great_grand_child_transform.PreconcatTransform(rotation_about_z);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionWithIntermediateSurfaceAndTransforms) {
// This test checks for correct scroll compensation when the fixed-position
// container contributes to a different render surface than the fixed-position
// layer. In this case, the surface draw transforms also have to be accounted
// for when checking the scroll delta.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
LayerImpl* great_grand_child = grand_child->children()[0];
child->SetIsContainerForFixedPositionLayers(true);
grand_child->SetPosition(gfx::PointF(8.f, 6.f));
grand_child->SetForceRenderSurface(true);
great_grand_child->SetPositionConstraint(fixed_to_top_left_);
great_grand_child->SetDrawsContent(true);
gfx::Transform rotation_about_z;
rotation_about_z.RotateAboutZAxis(90.0);
grand_child->SetTransform(rotation_about_z);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
gfx::Transform expected_surface_draw_transform;
expected_surface_draw_transform.Translate(8.0, 6.0);
expected_surface_draw_transform.PreconcatTransform(rotation_about_z);
gfx::Transform expected_grand_child_transform;
gfx::Transform expected_great_grand_child_transform;
ASSERT_TRUE(grand_child->render_surface());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(
expected_surface_draw_transform,
grand_child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 2: scroll delta of 10, 30
child->SetScrollDelta(gfx::Vector2d(10, 30));
ExecuteCalculateDrawProperties(root_.get());
// Here the grand_child remains unchanged, because it scrolls along with the
// render surface, and the translation is actually in the render surface. But,
// the fixed position great_grand_child is more awkward: its actually being
// drawn with respect to the render surface, but it needs to remain fixed with
// resepct to a container beyond that surface. So, the net result is that,
// unlike previous tests where the fixed position layer's transform remains
// unchanged, here the fixed position layer's transform explicitly contains
// the translation that cancels out the scroll.
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, -30.0); // scroll delta
expected_surface_draw_transform.MakeIdentity();
expected_surface_draw_transform.Translate(-10.0, -30.0); // scroll delta
expected_surface_draw_transform.Translate(8.0, 6.0);
expected_surface_draw_transform.PreconcatTransform(rotation_about_z);
// The rotation and its inverse are needed to place the scroll delta
// compensation in the correct space. This test will fail if the
// rotation/inverse are backwards, too, so it requires perfect order of
// operations.
expected_great_grand_child_transform.MakeIdentity();
expected_great_grand_child_transform.PreconcatTransform(
Inverse(rotation_about_z));
// explicit canceling out the scroll delta that gets embedded in the fixed
// position layer's surface.
expected_great_grand_child_transform.Translate(10.0, 30.0);
expected_great_grand_child_transform.PreconcatTransform(rotation_about_z);
ASSERT_TRUE(grand_child->render_surface());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(
expected_surface_draw_transform,
grand_child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
great_grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_great_grand_child_transform.MakeIdentity();
// The rotation and its inverse are needed to place the scroll delta
// compensation in the correct space. This test will fail if the
// rotation/inverse are backwards, too, so it requires perfect order of
// operations.
expected_great_grand_child_transform.PreconcatTransform(
Inverse(rotation_about_z));
// explicit canceling out the scroll delta that gets embedded in the fixed
// position layer's surface.
expected_great_grand_child_transform.Translate(10.0, 30.0);
// Also apply size delta in the child(container) layer space.
expected_great_grand_child_transform.Translate(20.0, 20.0);
expected_great_grand_child_transform.PreconcatTransform(rotation_about_z);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithMultipleIntermediateSurfaces) {
// This test checks for correct scroll compensation when the fixed-position
// container contributes to a different render surface than the fixed-position
// layer, with additional render surfaces in-between. This checks that the
// conversion to ancestor surfaces is accumulated properly in the final matrix
// transform.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
LayerImpl* great_grand_child = grand_child->children()[0];
// Add one more layer to the test tree for this scenario.
{
gfx::Transform identity;
scoped_ptr<LayerImpl> fixed_position_child =
LayerImpl::Create(host_impl_.active_tree(), 5);
SetLayerPropertiesForTesting(fixed_position_child.get(),
identity,
gfx::Point3F(),
gfx::PointF(),
gfx::Size(100, 100),
true);
great_grand_child->AddChild(fixed_position_child.Pass());
}
LayerImpl* fixed_position_child = great_grand_child->children()[0];
// Actually set up the scenario here.
child->SetIsContainerForFixedPositionLayers(true);
grand_child->SetPosition(gfx::PointF(8.f, 6.f));
grand_child->SetForceRenderSurface(true);
great_grand_child->SetPosition(gfx::PointF(40.f, 60.f));
great_grand_child->SetForceRenderSurface(true);
fixed_position_child->SetPositionConstraint(fixed_to_top_left_);
fixed_position_child->SetDrawsContent(true);
// The additional rotations, which are non-commutative with translations, help
// to verify that we have correct order-of-operations in the final scroll
// compensation. Note that rotating about the center of the layer ensures we
// do not accidentally clip away layers that we want to test.
gfx::Transform rotation_about_z;
rotation_about_z.Translate(50.0, 50.0);
rotation_about_z.RotateAboutZAxis(90.0);
rotation_about_z.Translate(-50.0, -50.0);
grand_child->SetTransform(rotation_about_z);
great_grand_child->SetTransform(rotation_about_z);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
gfx::Transform expected_grand_child_surface_draw_transform;
expected_grand_child_surface_draw_transform.Translate(8.0, 6.0);
expected_grand_child_surface_draw_transform.PreconcatTransform(
rotation_about_z);
gfx::Transform expected_grand_child_transform;
gfx::Transform expected_great_grand_child_surface_draw_transform;
expected_great_grand_child_surface_draw_transform.Translate(40.0, 60.0);
expected_great_grand_child_surface_draw_transform.PreconcatTransform(
rotation_about_z);
gfx::Transform expected_great_grand_child_transform;
gfx::Transform expected_fixed_position_child_transform;
ASSERT_TRUE(grand_child->render_surface());
ASSERT_TRUE(great_grand_child->render_surface());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(
expected_grand_child_surface_draw_transform,
grand_child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(
expected_great_grand_child_surface_draw_transform,
great_grand_child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_fixed_position_child_transform,
fixed_position_child->draw_transform());
// Case 2: scroll delta of 10, 30
child->SetScrollDelta(gfx::Vector2d(10, 30));
ExecuteCalculateDrawProperties(root_.get());
expected_child_transform.MakeIdentity();
expected_child_transform.Translate(-10.0, -30.0); // scroll delta
expected_grand_child_surface_draw_transform.MakeIdentity();
expected_grand_child_surface_draw_transform.Translate(-10.0,
-30.0); // scroll delta
expected_grand_child_surface_draw_transform.Translate(8.0, 6.0);
expected_grand_child_surface_draw_transform.PreconcatTransform(
rotation_about_z);
// grand_child, great_grand_child, and great_grand_child's surface are not
// expected to change, since they are all not fixed, and they are all drawn
// with respect to grand_child's surface that already has the scroll delta
// accounted for.
// But the great-great grandchild, "fixed_position_child", should have a
// transform that explicitly cancels out the scroll delta. The expected
// transform is: compound_draw_transform.Inverse() * translate(positive scroll
// delta) * compound_origin_transform from great_grand_childSurface's origin
// to the root surface.
gfx::Transform compound_draw_transform;
compound_draw_transform.Translate(8.0,
6.0); // origin translation of grand_child
compound_draw_transform.PreconcatTransform(
rotation_about_z); // rotation of grand_child
compound_draw_transform.Translate(
40.0, 60.0); // origin translation of great_grand_child
compound_draw_transform.PreconcatTransform(
rotation_about_z); // rotation of great_grand_child
expected_fixed_position_child_transform.MakeIdentity();
expected_fixed_position_child_transform.PreconcatTransform(
Inverse(compound_draw_transform));
// explicit canceling out the scroll delta that gets embedded in the fixed
// position layer's surface.
expected_fixed_position_child_transform.Translate(10.0, 30.0);
expected_fixed_position_child_transform.PreconcatTransform(
compound_draw_transform);
ASSERT_TRUE(grand_child->render_surface());
ASSERT_TRUE(great_grand_child->render_surface());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(
expected_grand_child_surface_draw_transform,
grand_child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(
expected_great_grand_child_surface_draw_transform,
great_grand_child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_fixed_position_child_transform,
fixed_position_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_fixed_position_child_transform,
fixed_position_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
fixed_position_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_fixed_position_child_transform.MakeIdentity();
expected_fixed_position_child_transform.PreconcatTransform(
Inverse(compound_draw_transform));
// explicit canceling out the scroll delta that gets embedded in the fixed
// position layer's surface.
expected_fixed_position_child_transform.Translate(10.0, 30.0);
// Also apply size delta in the child(container) layer space.
expected_fixed_position_child_transform.Translate(20.0, 20.0);
expected_fixed_position_child_transform.PreconcatTransform(
compound_draw_transform);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_great_grand_child_transform,
great_grand_child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_fixed_position_child_transform,
fixed_position_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerWithContainerLayerThatHasSurface) {
// This test checks for correct scroll compensation when the fixed-position
// container itself has a render surface. In this case, the container layer
// should be treated like a layer that contributes to a render target, and
// that render target is completely irrelevant; it should not affect the
// scroll compensation.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
child->SetIsContainerForFixedPositionLayers(true);
child->SetForceRenderSurface(true);
grand_child->SetPositionConstraint(fixed_to_top_left_);
grand_child->SetDrawsContent(true);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_surface_draw_transform;
expected_surface_draw_transform.Translate(0.0, 0.0);
gfx::Transform expected_child_transform;
gfx::Transform expected_grand_child_transform;
ASSERT_TRUE(child->render_surface());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_surface_draw_transform,
child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 2: scroll delta of 10, 10
child->SetScrollDelta(gfx::Vector2d(10, 10));
ExecuteCalculateDrawProperties(root_.get());
// The surface is translated by scroll delta, the child transform doesn't
// change because it scrolls along with the surface, but the fixed position
// grand_child needs to compensate for the scroll translation.
expected_surface_draw_transform.MakeIdentity();
expected_surface_draw_transform.Translate(-10.0, -10.0);
expected_grand_child_transform.MakeIdentity();
expected_grand_child_transform.Translate(10.0, 10.0);
ASSERT_TRUE(child->render_surface());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_surface_draw_transform,
child->render_surface()->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 3: fixed-container size delta of 20, 20
SetFixedContainerSizeDelta(child, gfx::Vector2d(20, 20));
ExecuteCalculateDrawProperties(root_.get());
// Top-left fixed-position layer should not be affected by container size.
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
// Case 4: Bottom-right fixed-position layer.
grand_child->SetPositionConstraint(fixed_to_bottom_right_);
ExecuteCalculateDrawProperties(root_.get());
// Bottom-right fixed-position layer moves as container resizes.
expected_grand_child_transform.MakeIdentity();
// The surface is translated by scroll delta, the child transform doesn't
// change because it scrolls along with the surface, but the fixed position
// grand_child needs to compensate for the scroll translation.
expected_grand_child_transform.Translate(10.0, 10.0);
// Apply size delta from the child(container) layer.
expected_grand_child_transform.Translate(20.0, 20.0);
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,
child->draw_transform());
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_grand_child_transform,
grand_child->draw_transform());
}
TEST_F(LayerPositionConstraintTest,
ScrollCompensationForFixedPositionLayerThatIsAlsoFixedPositionContainer) {
// This test checks the scenario where a fixed-position layer also happens to
// be a container itself for a descendant fixed position layer. In particular,
// the layer should not accidentally be fixed to itself.
LayerImpl* child = scroll_->children()[0];
LayerImpl* grand_child = child->children()[0];
child->SetIsContainerForFixedPositionLayers(true);
grand_child->SetPositionConstraint(fixed_to_top_left_);
// This should not confuse the grand_child. If correct, the grand_child would
// still be considered fixed to its container (i.e. "child").
grand_child->SetIsContainerForFixedPositionLayers(true);
// Case 1: scroll delta of 0, 0
child->SetScrollDelta(gfx::Vector2d(0, 0));
ExecuteCalculateDrawProperties(root_.get());
gfx::Transform expected_child_transform;
gfx::Transform expected_grand_child_transform;
EXPECT_TRANSFORMATION_MATRIX_EQ(expected_child_transform,