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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_TREES_DRAW_PROPERTY_UTILS_H_
#define CC_TREES_DRAW_PROPERTY_UTILS_H_
#include <optional>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "cc/cc_export.h"
#include "cc/layers/layer_collections.h"
namespace gfx {
class Transform;
class Vector2dF;
} // namespace gfx
namespace cc {
class Layer;
class LayerImpl;
class LayerTreeHost;
class LayerTreeImpl;
class EffectTree;
class TransformTree;
class PropertyTrees;
struct EffectNode;
struct TransformNode;
struct ViewportPropertyIds;
namespace draw_property_utils {
void CC_EXPORT ConcatInverseSurfaceContentsScale(const EffectNode* effect_node,
gfx::Transform* transform);
// Computes combined (screen space) transforms for every node in the transform
// tree. This must be done prior to calling |ComputeClips|.
void CC_EXPORT
ComputeTransforms(TransformTree* transform_tree,
const ViewportPropertyIds& viewport_property_ids);
// Computes screen space opacity for every node in the opacity tree.
void CC_EXPORT ComputeEffects(EffectTree* effect_tree);
void CC_EXPORT UpdatePropertyTrees(LayerTreeHost* layer_tree_host);
void CC_EXPORT
UpdatePropertyTreesAndRenderSurfaces(LayerTreeImpl* layer_tree_impl,
PropertyTrees* property_trees);
void CC_EXPORT FindLayersThatNeedUpdates(LayerTreeHost* layer_tree_host,
LayerList* update_layer_list);
void CC_EXPORT
FindLayersThatNeedUpdates(LayerTreeImpl* layer_tree_impl,
std::vector<LayerImpl*>* visible_layer_list);
gfx::Transform CC_EXPORT DrawTransform(const LayerImpl* layer,
const TransformTree& transform_tree,
const EffectTree& effect_tree);
gfx::Transform CC_EXPORT ScreenSpaceTransform(const Layer* layer,
const TransformTree& tree);
gfx::Transform CC_EXPORT ScreenSpaceTransform(const LayerImpl* layer,
const TransformTree& tree);
void CC_EXPORT UpdatePageScaleFactor(PropertyTrees* property_trees,
TransformNode* page_scale_node,
float page_scale_factor);
void CC_EXPORT CalculateDrawProperties(
LayerTreeImpl* layer_tree_impl,
RenderSurfaceList* output_render_surface_list,
LayerImplList* output_update_layer_list_for_testing = nullptr);
bool CC_EXPORT LayerShouldBeSkippedForDrawPropertiesComputation(
LayerImpl* layer,
const PropertyTrees* property_trees);
bool CC_EXPORT
IsLayerBackFaceVisibleForTesting(const LayerImpl* layer,
const PropertyTrees* property_trees);
// Returns true if the scales are interchangeable when rasterizing the same
// drawings without visual misalignment.
bool CC_EXPORT RasterScalesApproximatelyEqual(gfx::Vector2dF scale1,
gfx::Vector2dF scale2);
// The result will be used to avoid blurriness of rasterized rendering under
// transforms with subpixel translations. If applicable, the offset will be in
// the range of [0, 1) for each component. After this function returns
// - for a RenderSurfaceImpl, the offset should be subtracted from the the draw
// transform, and be added to the draw transforms of contributing layers and
// render surfaces.
// - for a PictureLayerImpl, the offset should be converted to a raster
// translation which will translate rasterization and offset tex_coord_rect
// of draw quads.
//
// With this offset applied, the drawings will still be rendered at the same
// screen locations, but the rasterized texels will be aligned to the screen
// pixels, to avoid the additional bluriness during compositing.
//
// Returns nullopt if pixel alignment can't be achieved.
std::optional<gfx::Vector2dF> CC_EXPORT
PixelAlignmentOffset(const gfx::Transform& screen_space_transform,
const gfx::Transform& original_draw_transform);
#if DCHECK_IS_ON()
// Checks and logs if double background blur exists in any layers. Returns
// true if no double background blur is detected, false otherwise.
bool CC_EXPORT
LogDoubleBackgroundBlur(const LayerTreeImpl& layer_tree_impl,
const RenderSurfaceList& render_surface_list);
#endif
} // namespace draw_property_utils
} // namespace cc
#endif // CC_TREES_DRAW_PROPERTY_UTILS_H_
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