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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 <limits>
#include <vector>
#include "base/bind.h"
#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/geometry/rect.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/transform.h"
namespace cc {
class LayerImpl;
class Layer;
class SwapPromise;
class CC_EXPORT LayerTreeHostCommon {
public:
static gfx::Rect CalculateVisibleRect(const gfx::Rect& target_surface_rect,
const gfx::Rect& layer_bound_rect,
const gfx::Transform& transform);
template <typename LayerType, typename RenderSurfaceLayerListType>
struct CalcDrawPropsInputs {
public:
CalcDrawPropsInputs(LayerType* root_layer,
const gfx::Size& device_viewport_size,
const gfx::Transform& device_transform,
float device_scale_factor,
float page_scale_factor,
const LayerType* page_scale_application_layer,
const gfx::Vector2dF& elastic_overscroll,
const LayerType* elastic_overscroll_application_layer,
int max_texture_size,
bool can_use_lcd_text,
bool layers_always_allowed_lcd_text,
bool can_render_to_separate_surface,
bool can_adjust_raster_scales,
RenderSurfaceLayerListType* render_surface_layer_list,
int current_render_surface_layer_list_id)
: root_layer(root_layer),
device_viewport_size(device_viewport_size),
device_transform(device_transform),
device_scale_factor(device_scale_factor),
page_scale_factor(page_scale_factor),
page_scale_application_layer(page_scale_application_layer),
elastic_overscroll(elastic_overscroll),
elastic_overscroll_application_layer(
elastic_overscroll_application_layer),
max_texture_size(max_texture_size),
can_use_lcd_text(can_use_lcd_text),
layers_always_allowed_lcd_text(layers_always_allowed_lcd_text),
can_render_to_separate_surface(can_render_to_separate_surface),
can_adjust_raster_scales(can_adjust_raster_scales),
render_surface_layer_list(render_surface_layer_list),
current_render_surface_layer_list_id(
current_render_surface_layer_list_id) {}
LayerType* root_layer;
gfx::Size device_viewport_size;
const gfx::Transform& device_transform;
float device_scale_factor;
float page_scale_factor;
const LayerType* page_scale_application_layer;
gfx::Vector2dF elastic_overscroll;
const LayerType* elastic_overscroll_application_layer;
int max_texture_size;
bool can_use_lcd_text;
bool layers_always_allowed_lcd_text;
bool can_render_to_separate_surface;
bool can_adjust_raster_scales;
RenderSurfaceLayerListType* render_surface_layer_list;
int current_render_surface_layer_list_id;
};
template <typename LayerType, typename RenderSurfaceLayerListType>
struct CalcDrawPropsInputsForTesting
: public CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType> {
CalcDrawPropsInputsForTesting(
LayerType* root_layer,
const gfx::Size& device_viewport_size,
const gfx::Transform& device_transform,
RenderSurfaceLayerListType* render_surface_layer_list);
CalcDrawPropsInputsForTesting(
LayerType* root_layer,
const gfx::Size& device_viewport_size,
RenderSurfaceLayerListType* render_surface_layer_list);
private:
const gfx::Transform identity_transform_;
};
typedef CalcDrawPropsInputs<Layer, RenderSurfaceLayerList>
CalcDrawPropsMainInputs;
typedef CalcDrawPropsInputsForTesting<Layer, RenderSurfaceLayerList>
CalcDrawPropsMainInputsForTesting;
static void CalculateDrawProperties(CalcDrawPropsMainInputs* inputs);
typedef CalcDrawPropsInputs<LayerImpl, LayerImplList> CalcDrawPropsImplInputs;
typedef CalcDrawPropsInputsForTesting<LayerImpl, LayerImplList>
CalcDrawPropsImplInputsForTesting;
static void CalculateDrawProperties(CalcDrawPropsImplInputs* inputs);
template <typename LayerType>
static bool RenderSurfaceContributesToTarget(LayerType*,
int target_surface_layer_id);
template <typename LayerType>
static void CallFunctionForSubtree(
LayerType* root_layer,
const base::Callback<void(LayerType* layer)>& function);
// 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_layer_as_raw_ptr(const LayerList& layers, size_t index) {
return layers[index].get();
}
static LayerImpl* get_layer_as_raw_ptr(const OwnedLayerImplList& layers,
size_t index) {
return layers[index];
}
static LayerImpl* get_layer_as_raw_ptr(const LayerImplList& layers,
size_t index) {
return layers[index];
}
struct ScrollUpdateInfo {
int layer_id;
// TODO(miletus) : Use ScrollOffset once LayerTreeHost/Blink fully supports
// franctional scroll offset.
gfx::Vector2d scroll_delta;
};
};
struct CC_EXPORT ScrollAndScaleSet {
ScrollAndScaleSet();
~ScrollAndScaleSet();
std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
float page_scale_delta;
gfx::Vector2dF elastic_overscroll_delta;
float top_controls_delta;
ScopedPtrVector<SwapPromise> swap_promises;
};
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)
return NULL;
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_layer_as_raw_ptr(root_layer->children(), i), layer_id))
return found;
}
return NULL;
}
template <typename LayerType>
void LayerTreeHostCommon::CallFunctionForSubtree(
LayerType* root_layer,
const base::Callback<void(LayerType* layer)>& function) {
function.Run(root_layer);
if (LayerType* mask_layer = root_layer->mask_layer())
function.Run(mask_layer);
if (LayerType* replica_layer = root_layer->replica_layer()) {
function.Run(replica_layer);
if (LayerType* mask_layer = replica_layer->mask_layer())
function.Run(mask_layer);
}
for (size_t i = 0; i < root_layer->children().size(); ++i) {
CallFunctionForSubtree(get_layer_as_raw_ptr(root_layer->children(), i),
function);
}
}
template <typename LayerType, typename RenderSurfaceLayerListType>
LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
RenderSurfaceLayerListType>::
CalcDrawPropsInputsForTesting(
LayerType* root_layer,
const gfx::Size& device_viewport_size,
const gfx::Transform& device_transform,
RenderSurfaceLayerListType* render_surface_layer_list)
: CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
root_layer,
device_viewport_size,
device_transform,
1.f,
1.f,
NULL,
gfx::Vector2dF(),
NULL,
std::numeric_limits<int>::max() / 2,
false,
false,
true,
false,
render_surface_layer_list,
0) {
DCHECK(root_layer);
DCHECK(render_surface_layer_list);
}
template <typename LayerType, typename RenderSurfaceLayerListType>
LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
RenderSurfaceLayerListType>::
CalcDrawPropsInputsForTesting(
LayerType* root_layer,
const gfx::Size& device_viewport_size,
RenderSurfaceLayerListType* render_surface_layer_list)
: CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
root_layer,
device_viewport_size,
identity_transform_,
1.f,
1.f,
NULL,
gfx::Vector2dF(),
NULL,
std::numeric_limits<int>::max() / 2,
false,
false,
true,
false,
render_surface_layer_list,
0) {
DCHECK(root_layer);
DCHECK(render_surface_layer_list);
}
} // namespace cc
#endif // CC_TREES_LAYER_TREE_HOST_COMMON_H_