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77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DISPLAYLISTCLIPSTATE_H_
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#define DISPLAYLISTCLIPSTATE_H_
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#include "DisplayItemClip.h"
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class nsIFrame;
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class nsDisplayListBuilder;
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namespace mozilla {
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/**
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* All clip coordinates are in appunits relative to the reference frame
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* for the display item we're building.
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*/
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class DisplayListClipState {
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public:
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DisplayListClipState()
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: mClipContentDescendants(nullptr)
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, mClipContainingBlockDescendants(nullptr)
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, mCurrentCombinedClip(nullptr)
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{}
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const DisplayItemClip* GetCurrentCombinedClip(nsDisplayListBuilder* aBuilder);
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const DisplayItemClip* GetClipForContainingBlockDescendants()
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{
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return mClipContainingBlockDescendants;
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}
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const DisplayItemClip* GetClipForContentDescendants()
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{
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return mClipContentDescendants;
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}
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void SetClipForContainingBlockDescendants(const DisplayItemClip* aClip)
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{
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mClipContainingBlockDescendants = aClip;
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mCurrentCombinedClip = nullptr;
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}
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void SetClipForContentDescendants(const DisplayItemClip* aClip)
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{
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mClipContentDescendants = aClip;
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mCurrentCombinedClip = nullptr;
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}
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private:
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/**
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* All content descendants (i.e. following placeholder frames to their
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* out-of-flows if necessary) should be clipped by mClipContentDescendants.
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* Null if no clipping applies.
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*/
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const DisplayItemClip* mClipContentDescendants;
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/**
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* All containing-block descendants (i.e. frame descendants) should be
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* clipped by mClipContainingBlockDescendants.
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* Null if no clipping applies.
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*/
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const DisplayItemClip* mClipContainingBlockDescendants;
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/**
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* The intersection of mClipContentDescendants and
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* mClipContainingBlockDescendants.
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* Allocated in the nsDisplayListBuilder arena. Null if none has been
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* allocated or both mClipContentDescendants and mClipContainingBlockDescendants
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* are null.
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*/
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const DisplayItemClip* mCurrentCombinedClip;
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};
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}
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#endif /* DISPLAYLISTCLIPSTATE_H_ */
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