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// Copyright 2020 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_VIEW_TRANSITION_VIEW_TRANSITION_REQUEST_H_
#define CC_VIEW_TRANSITION_VIEW_TRANSITION_REQUEST_H_
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/functional/callback.h"
#include "cc/cc_export.h"
#include "cc/view_transition/view_transition_element_id.h"
#include "components/viz/common/quads/compositor_frame_transition_directive.h"
#include "components/viz/common/quads/compositor_render_pass.h"
namespace cc {
// This class represents a view transition request. It is constructed in
// Blink with an intent of translating this request into a viz directive for the
// transition to occur.
class CC_EXPORT ViewTransitionRequest {
public:
struct CC_EXPORT SharedElementInfo {
SharedElementInfo();
~SharedElementInfo();
viz::CompositorRenderPassId render_pass_id;
viz::ViewTransitionElementResourceId resource_id;
};
using SharedElementMap = std::map<ViewTransitionElementId, SharedElementInfo>;
using Type = viz::CompositorFrameTransitionDirective::Type;
// Creates a Type::kCapture type of request.
static std::unique_ptr<ViewTransitionRequest> CreateCapture(
uint32_t document_tag,
uint32_t shared_element_count,
viz::NavigationID navigation_id,
std::vector<viz::ViewTransitionElementResourceId> capture_ids,
base::OnceClosure commit_callback);
// Creates a Type::kAnimateRenderer type of request.
static std::unique_ptr<ViewTransitionRequest> CreateAnimateRenderer(
uint32_t document_tag,
viz::NavigationID navigation_id);
// Creates a Type::kRelease type of request.
static std::unique_ptr<ViewTransitionRequest> CreateRelease(
uint32_t document_tag,
viz::NavigationID navigation_id);
ViewTransitionRequest(ViewTransitionRequest&) = delete;
~ViewTransitionRequest();
ViewTransitionRequest& operator=(ViewTransitionRequest&) = delete;
// The callback is run when the request is sufficiently processed for us to be
// able to begin the next step in the animation. In other words, when this
// callback is invoked it can resolve a script promise that is gating this
// step.
base::OnceClosure TakeFinishedCallback() {
return std::move(commit_callback_);
}
// This constructs a viz directive. Note that repeated calls to this function
// would create a new sequence id for the directive, which means it would be
// processed again by viz.
viz::CompositorFrameTransitionDirective ConstructDirective(
const SharedElementMap& shared_element_render_pass_id_map) const;
// Returns the sequence id for this request.
uint32_t sequence_id() const { return sequence_id_; }
Type type() const { return type_; }
// Testing / debugging functionality.
std::string ToString() const;
private:
ViewTransitionRequest(
Type type,
uint32_t document_tag,
uint32_t shared_element_count,
viz::NavigationID navigation_id,
std::vector<viz::ViewTransitionElementResourceId> capture_ids,
base::OnceClosure commit_callback);
const Type type_;
const uint32_t document_tag_;
const uint32_t shared_element_count_;
const viz::NavigationID navigation_id_;
base::OnceClosure commit_callback_;
const uint32_t sequence_id_;
const std::vector<viz::ViewTransitionElementResourceId> capture_resource_ids_;
static uint32_t s_next_sequence_id_;
};
} // namespace cc
#endif // CC_VIEW_TRANSITION_VIEW_TRANSITION_REQUEST_H_
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