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// Copyright 2011 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.
#ifndef CC_TREES_LAYER_TREE_HOST_COMMON_H_
#define CC_TREES_LAYER_TREE_HOST_COMMON_H_
#include <vector>
#include "base/memory/ref_counted.h"
#include "cc/base/cc_export.h"
#include "cc/base/scoped_ptr_vector.h"
#include "cc/layers/layer_lists.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/transform.h"
#include "ui/gfx/vector2d.h"
namespace cc {
class LayerImpl;
class Layer;
class CC_EXPORT LayerTreeHostCommon {
public:
static gfx::Rect CalculateVisibleRect(gfx::Rect target_surface_rect,
gfx::Rect layer_bound_rect,
const gfx::Transform& transform);
static void CalculateDrawProperties(
Layer* root_layer,
gfx::Size device_viewport_size,
float device_scale_factor,
float page_scale_factor,
int max_texture_size,
bool can_use_lcd_text,
LayerList* render_surface_layer_list);
static void CalculateDrawProperties(
LayerImpl* root_layer,
gfx::Size device_viewport_size,
float device_scale_factor,
float page_scale_factor,
int max_texture_size,
bool can_use_lcd_text,
LayerImplList* render_surface_layer_list,
bool update_tile_priorities);
// Performs hit testing for a given render_surface_layer_list.
static LayerImpl* FindLayerThatIsHitByPoint(
gfx::PointF screen_space_point,
const LayerImplList& render_surface_layer_list);
static LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
gfx::PointF screen_space_point,
const LayerImplList& render_surface_layer_list);
static bool LayerHasTouchEventHandlersAt(gfx::PointF screen_space_point,
LayerImpl* layer_impl);
template <typename LayerType>
static bool RenderSurfaceContributesToTarget(LayerType*,
int target_surface_layer_id);
template <class Function, typename LayerType>
static void CallFunctionForSubtree(LayerType* root_layer);
// Returns a layer with the given id if one exists in the subtree starting
// from the given root layer (including mask and replica layers).
template <typename LayerType>
static LayerType* FindLayerInSubtree(LayerType* root_layer, int layer_id);
static Layer* get_child_as_raw_ptr(
const LayerList& children,
size_t index) {
return children[index].get();
}
static LayerImpl* get_child_as_raw_ptr(
const OwnedLayerImplList& children,
size_t index) {
return children[index];
}
struct ScrollUpdateInfo {
int layer_id;
gfx::Vector2d scroll_delta;
};
};
struct CC_EXPORT ScrollAndScaleSet {
ScrollAndScaleSet();
~ScrollAndScaleSet();
std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
float page_scale_delta;
};
template <typename LayerType>
bool LayerTreeHostCommon::RenderSurfaceContributesToTarget(
LayerType* layer,
int target_surface_layer_id) {
// A layer will either contribute its own content, or its render surface's
// content, to the target surface. The layer contributes its surface's content
// when both the following are true:
// (1) The layer actually has a render surface, and
// (2) The layer's render surface is not the same as the target surface.
//
// Otherwise, the layer just contributes itself to the target surface.
return layer->render_surface() && layer->id() != target_surface_layer_id;
}
template <typename LayerType>
LayerType* LayerTreeHostCommon::FindLayerInSubtree(LayerType* root_layer,
int layer_id) {
if (root_layer->id() == layer_id)
return root_layer;
if (root_layer->mask_layer() && root_layer->mask_layer()->id() == layer_id)
return root_layer->mask_layer();
if (root_layer->replica_layer() &&
root_layer->replica_layer()->id() == layer_id)
return root_layer->replica_layer();
for (size_t i = 0; i < root_layer->children().size(); ++i) {
if (LayerType* found = FindLayerInSubtree(
get_child_as_raw_ptr(root_layer->children(), i), layer_id))
return found;
}
return NULL;
}
template <class Function, typename LayerType>
void LayerTreeHostCommon::CallFunctionForSubtree(LayerType* root_layer) {
Function()(root_layer);
if (LayerType* mask_layer = root_layer->mask_layer())
Function()(mask_layer);
if (LayerType* replica_layer = root_layer->replica_layer()) {
Function()(replica_layer);
if (LayerType* mask_layer = replica_layer->mask_layer())
Function()(mask_layer);
}
for (size_t i = 0; i < root_layer->children().size(); ++i) {
CallFunctionForSubtree<Function>(
get_child_as_raw_ptr(root_layer->children(), i));
}
}
} // namespace cc
#endif // CC_TREES_LAYER_TREE_HOST_COMMON_H_
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