зеркало из https://github.com/mozilla/gecko-dev.git
417 строки
14 KiB
C++
417 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* rendering object for replaced elements with bitmap image data */
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#ifndef nsImageFrame_h___
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#define nsImageFrame_h___
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#include "nsSplittableFrame.h"
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#include "nsString.h"
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#include "nsAString.h"
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#include "nsIImageFrame.h"
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#include "nsIIOService.h"
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#include "nsIObserver.h"
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#include "imgIRequest.h"
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#include "nsStubImageDecoderObserver.h"
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#include "imgIDecoderObserver.h"
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#include "Layers.h"
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#include "ImageLayers.h"
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#include "nsDisplayList.h"
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#include "imgIContainer.h"
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class nsIFrame;
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class nsImageMap;
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class nsIURI;
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class nsILoadGroup;
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struct nsHTMLReflowState;
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struct nsHTMLReflowMetrics;
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struct nsSize;
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class nsDisplayImage;
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class nsPresContext;
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class nsImageFrame;
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class nsTransform2D;
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using namespace mozilla;
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using namespace mozilla::layers;
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class nsImageListener : public nsStubImageDecoderObserver
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{
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public:
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nsImageListener(nsImageFrame *aFrame);
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virtual ~nsImageListener();
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NS_DECL_ISUPPORTS
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// imgIDecoderObserver (override nsStubImageDecoderObserver)
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NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
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NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame,
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const nsIntRect *aRect);
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NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status,
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const PRUnichar *statusArg);
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// imgIContainerObserver (override nsStubImageDecoderObserver)
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NS_IMETHOD FrameChanged(imgIContainer *aContainer,
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const nsIntRect *dirtyRect);
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void SetFrame(nsImageFrame *frame) { mFrame = frame; }
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private:
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nsImageFrame *mFrame;
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};
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#define IMAGE_SIZECONSTRAINED NS_FRAME_STATE_BIT(20)
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#define IMAGE_GOTINITIALREFLOW NS_FRAME_STATE_BIT(21)
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#define ImageFrameSuper nsSplittableFrame
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class nsImageFrame : public ImageFrameSuper, public nsIImageFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS
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nsImageFrame(nsStyleContext* aContext);
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NS_DECL_QUERYFRAME
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virtual void DestroyFrom(nsIFrame* aDestructRoot);
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
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virtual IntrinsicSize GetIntrinsicSize();
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virtual nsSize GetIntrinsicRatio();
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NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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NS_IMETHOD GetContentForEvent(nsPresContext* aPresContext,
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nsEvent* aEvent,
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nsIContent** aContent);
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NS_IMETHOD HandleEvent(nsPresContext* aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus* aEventStatus);
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NS_IMETHOD GetCursor(const nsPoint& aPoint,
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nsIFrame::Cursor& aCursor);
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NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType);
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#ifdef ACCESSIBILITY
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virtual already_AddRefed<nsAccessible> CreateAccessible();
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#endif
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virtual nsIAtom* GetType() const;
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virtual PRBool IsFrameOfType(PRUint32 aFlags) const
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{
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return ImageFrameSuper::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
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}
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const;
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NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
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#endif
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virtual PRIntn GetSkipSides() const;
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NS_IMETHOD GetImageMap(nsPresContext *aPresContext, nsIImageMap **aImageMap);
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NS_IMETHOD GetIntrinsicImageSize(nsSize& aSize);
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static void ReleaseGlobals() {
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if (gIconLoad) {
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gIconLoad->Shutdown();
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NS_RELEASE(gIconLoad);
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}
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NS_IF_RELEASE(sIOService);
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}
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/**
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* Function to test whether aContent, which has aStyleContext as its style,
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* should get an image frame. Note that this method is only used by the
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* frame constructor; it's only here because it uses gIconLoad for now.
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*/
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static PRBool ShouldCreateImageFrameFor(nsIContent* aContent,
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nsStyleContext* aStyleContext);
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void DisplayAltFeedback(nsRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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imgIRequest* aRequest,
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nsPoint aPt);
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nsRect GetInnerArea() const;
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nsImageMap* GetImageMap(nsPresContext* aPresContext);
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virtual void AddInlineMinWidth(nsRenderingContext *aRenderingContext,
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InlineMinWidthData *aData);
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nsRefPtr<ImageContainer> GetContainer(LayerManager* aManager,
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imgIContainer* aImage);
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protected:
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virtual ~nsImageFrame();
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void EnsureIntrinsicSizeAndRatio(nsPresContext* aPresContext);
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virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder, nsSize aPadding,
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PRBool aShrinkWrap);
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PRBool IsServerImageMap();
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void TranslateEventCoords(const nsPoint& aPoint,
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nsIntPoint& aResult);
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PRBool GetAnchorHREFTargetAndNode(nsIURI** aHref, nsString& aTarget,
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nsIContent** aNode);
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/**
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* Computes the width of the string that fits into the available space
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*
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* @param in aLength total length of the string in PRUnichars
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* @param in aMaxWidth width not to be exceeded
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* @param out aMaxFit length of the string that fits within aMaxWidth
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* in PRUnichars
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* @return width of the string that fits within aMaxWidth
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*/
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nscoord MeasureString(const PRUnichar* aString,
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PRInt32 aLength,
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nscoord aMaxWidth,
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PRUint32& aMaxFit,
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nsRenderingContext& aContext);
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void DisplayAltText(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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const nsString& aAltText,
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const nsRect& aRect);
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void PaintImage(nsRenderingContext& aRenderingContext, nsPoint aPt,
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const nsRect& aDirtyRect, imgIContainer* aImage,
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PRUint32 aFlags);
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protected:
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friend class nsImageListener;
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nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
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nsresult OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame,
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const nsIntRect *rect);
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nsresult OnStopDecode(imgIRequest *aRequest,
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nsresult aStatus,
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const PRUnichar *aStatusArg);
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nsresult FrameChanged(imgIContainer *aContainer,
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const nsIntRect *aDirtyRect);
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private:
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// random helpers
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inline void SpecToURI(const nsAString& aSpec, nsIIOService *aIOService,
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nsIURI **aURI);
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inline void GetLoadGroup(nsPresContext *aPresContext,
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nsILoadGroup **aLoadGroup);
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nscoord GetContinuationOffset() const;
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void GetDocumentCharacterSet(nsACString& aCharset) const;
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bool ShouldDisplaySelection();
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/**
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* Recalculate mIntrinsicSize from the image.
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*
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* @return whether aImage's size did _not_
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* match our previous intrinsic size.
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*/
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PRBool UpdateIntrinsicSize(imgIContainer* aImage);
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/**
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* Recalculate mIntrinsicRatio from the image.
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*
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* @return whether aImage's ratio did _not_
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* match our previous intrinsic ratio.
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*/
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PRBool UpdateIntrinsicRatio(imgIContainer* aImage);
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/**
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* This function calculates the transform for converting between
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* source space & destination space. May fail if our image has a
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* percent-valued or zero-valued height or width.
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*
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* @param aTransform The transform object to populate.
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*
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* @return whether we succeeded in creating the transform.
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*/
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PRBool GetSourceToDestTransform(nsTransform2D& aTransform);
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/**
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* Helper functions to check whether the request or image container
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* corresponds to a load we don't care about. Most of the decoder
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* observer methods will bail early if these return true.
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*/
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PRBool IsPendingLoad(imgIRequest* aRequest) const;
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PRBool IsPendingLoad(imgIContainer* aContainer) const;
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/**
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* Function to convert a dirty rect in the source image to a dirty
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* rect for the image frame.
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*/
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nsRect SourceRectToDest(const nsIntRect & aRect);
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nsImageMap* mImageMap;
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nsCOMPtr<imgIDecoderObserver> mListener;
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nsSize mComputedSize;
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nsIFrame::IntrinsicSize mIntrinsicSize;
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nsSize mIntrinsicRatio;
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PRBool mDisplayingIcon;
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static nsIIOService* sIOService;
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nsRefPtr<ImageContainer> mImageContainer;
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/* loading / broken image icon support */
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// XXXbz this should be handled by the prescontext, I think; that
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// way we would have a single iconload per mozilla session instead
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// of one per document...
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// LoadIcons: initiate the loading of the static icons used to show
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// loading / broken images
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nsresult LoadIcons(nsPresContext *aPresContext);
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nsresult LoadIcon(const nsAString& aSpec, nsPresContext *aPresContext,
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imgIRequest **aRequest);
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class IconLoad : public nsIObserver,
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public imgIDecoderObserver {
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// private class that wraps the data and logic needed for
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// broken image and loading image icons
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public:
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IconLoad();
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void Shutdown()
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{
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// in case the pref service releases us later
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if (mLoadingImage) {
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mLoadingImage->CancelAndForgetObserver(NS_ERROR_FAILURE);
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mLoadingImage = nsnull;
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}
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if (mBrokenImage) {
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mBrokenImage->CancelAndForgetObserver(NS_ERROR_FAILURE);
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mBrokenImage = nsnull;
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}
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}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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NS_DECL_IMGICONTAINEROBSERVER
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NS_DECL_IMGIDECODEROBSERVER
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void AddIconObserver(nsImageFrame *frame) {
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NS_ABORT_IF_FALSE(!mIconObservers.Contains(frame),
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"Observer shouldn't aleady be in array");
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mIconObservers.AppendElement(frame);
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}
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void RemoveIconObserver(nsImageFrame *frame) {
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#ifdef DEBUG
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PRBool rv =
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#endif
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mIconObservers.RemoveElement(frame);
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NS_ABORT_IF_FALSE(rv, "Observer not in array");
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}
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private:
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void GetPrefs();
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nsTObserverArray<nsImageFrame*> mIconObservers;
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public:
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nsCOMPtr<imgIRequest> mLoadingImage;
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nsCOMPtr<imgIRequest> mBrokenImage;
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PRPackedBool mPrefForceInlineAltText;
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PRPackedBool mPrefShowPlaceholders;
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};
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public:
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static IconLoad* gIconLoad; // singleton pattern: one LoadIcons instance is used
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friend class nsDisplayImage;
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};
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/**
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* Note that nsDisplayImage does not receive events. However, an image element
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* is replaced content so its background will be z-adjacent to the
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* image itself, and hence receive events just as if the image itself
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* received events.
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*/
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class nsDisplayImage : public nsDisplayItem {
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public:
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nsDisplayImage(nsDisplayListBuilder* aBuilder, nsImageFrame* aFrame,
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imgIContainer* aImage)
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: nsDisplayItem(aBuilder, aFrame), mImage(aImage) {
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MOZ_COUNT_CTOR(nsDisplayImage);
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}
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virtual ~nsDisplayImage() {
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MOZ_COUNT_DTOR(nsDisplayImage);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx);
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nsCOMPtr<imgIContainer> GetImage();
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/**
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* Returns an ImageContainer for this image if the image type
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* supports it (TYPE_RASTER only).
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*/
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nsRefPtr<ImageContainer> GetContainer(LayerManager* aManager);
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/**
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* Configure an ImageLayer for this display item.
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* Set the required filter and scaling transform.
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*/
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void ConfigureLayer(ImageLayer* aLayer);
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NS_DISPLAY_DECL_NAME("Image", TYPE_IMAGE)
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private:
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nsCOMPtr<imgIContainer> mImage;
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};
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#endif /* nsImageFrame_h___ */
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