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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_HITTESTINFOMANAGER_H
#define GFX_HITTESTINFOMANAGER_H
#include "mozilla/gfx/CompositorHitTestInfo.h"
#include "mozilla/layers/ScrollableLayerGuid.h"
#include "mozilla/webrender/WebRenderAPI.h"
#include "nsRect.h"
namespace mozilla {
class nsDisplayItem;
class nsDisplayListBuilder;
namespace wr {
class DisplayListBuilder;
}
namespace layers {
/**
* This class extracts the hit testing information (area, flags, ViewId) from
* Gecko display items and pushes them into WebRender display list.
*
* The hit testing information is deduplicated: a new hit test item is only
* added if the new area is not contained in the previous area, or if the flags,
* ViewId, or current spatial id is different.
*/
class HitTestInfoManager {
public:
HitTestInfoManager();
/**
* Resets the previous hit testing information.
*/
void Reset();
/**
* Extracts the hit testing information from |aItem|, and if necessary, adds
* a new WebRender hit test item using |aBuilder|.
*
* Returns true if a hit test item was pushed.
*/
bool ProcessItem(nsDisplayItem* aItem, wr::DisplayListBuilder& aBuilder,
nsDisplayListBuilder* aDisplayListBuilder);
private:
bool Update(const nsRect& aArea, const gfx::CompositorHitTestInfo& aFlags,
const ScrollableLayerGuid::ViewID& aViewId,
const wr::WrSpaceAndClipChain& aSpaceAndClip);
nsRect mArea;
gfx::CompositorHitTestInfo mFlags;
ScrollableLayerGuid::ViewID mViewId;
wr::WrSpaceAndClipChain mSpaceAndClipChain;
};
} // namespace layers
} // namespace mozilla
#endif
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