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90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
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/* -*- Mode: C++; tab-width: 2; 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 GFX_FRAMEMETRICS_H
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#define GFX_FRAMEMETRICS_H
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#include "gfxPoint.h"
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#include "gfxTypes.h"
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#include "nsRect.h"
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#include "mozilla/gfx/Rect.h"
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namespace mozilla {
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namespace layers {
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/**
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* The viewport and displayport metrics for the painted frame at the
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* time of a layer-tree transaction. These metrics are especially
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* useful for shadow layers, because the metrics values are updated
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* atomically with new pixels.
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*/
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struct THEBES_API FrameMetrics {
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public:
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// We use IDs to identify frames across processes.
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typedef PRUint64 ViewID;
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static const ViewID NULL_SCROLL_ID; // This container layer does not scroll.
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static const ViewID ROOT_SCROLL_ID; // This is the root scroll frame.
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static const ViewID START_SCROLL_ID; // This is the ID that scrolling subframes
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// will begin at.
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FrameMetrics()
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: mViewport(0, 0, 0, 0)
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, mContentRect(0, 0, 0, 0)
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, mViewportScrollOffset(0, 0)
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, mScrollId(NULL_SCROLL_ID)
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, mCSSContentRect(0, 0, 0, 0)
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, mResolution(1, 1)
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{}
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// Default copy ctor and operator= are fine
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bool operator==(const FrameMetrics& aOther) const
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{
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return (mViewport.IsEqualEdges(aOther.mViewport) &&
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mViewportScrollOffset == aOther.mViewportScrollOffset &&
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mDisplayPort.IsEqualEdges(aOther.mDisplayPort) &&
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mScrollId == aOther.mScrollId);
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}
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bool operator!=(const FrameMetrics& aOther) const
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{
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return !operator==(aOther);
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}
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bool IsDefault() const
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{
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return (FrameMetrics() == *this);
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}
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bool IsRootScrollable() const
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{
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return mScrollId == ROOT_SCROLL_ID;
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}
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bool IsScrollable() const
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{
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return mScrollId != NULL_SCROLL_ID;
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}
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// These are all in layer coordinate space.
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nsIntRect mViewport;
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nsIntRect mContentRect;
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nsIntPoint mViewportScrollOffset;
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nsIntRect mDisplayPort;
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ViewID mScrollId;
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// Consumers often want to know the origin/size before scaling to pixels
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// so we record this as well.
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gfx::Rect mCSSContentRect;
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// This represents the resolution at which the associated layer
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// will been rendered.
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gfxSize mResolution;
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};
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}
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}
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#endif /* GFX_FRAMEMETRICS_H */
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