/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */
#include "nsHTMLParts.h"
#include "nsHTMLImage.h"
#include "nsHTMLTagContent.h"
#include "nsString.h"
#include "nsLeafFrame.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIFrameImageLoader.h"
#include "nsIPresShell.h"
#include "nsHTMLIIDs.h"
#include "nsIImage.h"
#include "nsIWidget.h"
#include "nsHTMLAtoms.h"
#include "nsIHTMLAttributes.h"
#include "nsIDocument.h"
#include "nsIHTMLDocument.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIImageMap.h"
#include "nsILinkHandler.h"
#include "nsIURL.h"
#include "nsCSSLayout.h"
#include "nsHTMLBase.h"
#include "prprf.h"
#include "nsISizeOfHandler.h"

#define BROKEN_IMAGE_URL "resource:/res/html/broken-image.gif"

// XXX image frame layout can be 100% decoupled from the content
// object; all it needs are attributes to work properly

static NS_DEFINE_IID(kIHTMLDocumentIID, NS_IHTMLDOCUMENT_IID);

#define nsHTMLImageSuper nsHTMLTagContent
class nsHTMLImage : public nsHTMLImageSuper {
public:
  nsHTMLImage(nsIAtom* aTag);

  NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const;
  virtual nsresult CreateFrame(nsIPresContext* aPresContext,
                               nsIFrame* aParentFrame,
                               nsIStyleContext* aStyleContext,
                               nsIFrame*& aResult);

  virtual void SetAttribute(nsIAtom* aAttribute, const nsString& aValue);
  virtual void MapAttributesInto(nsIStyleContext* aContext, 
                                 nsIPresContext* aPresContext);

protected:
  virtual ~nsHTMLImage();
  void SizeOfWithoutThis(nsISizeOfHandler* aHandler) const;

  virtual nsContentAttr AttributeToString(nsIAtom* aAttribute,
                                          nsHTMLValue& aValue,
                                          nsString& aResult) const;
};

#define ImageFrameSuper nsLeafFrame
class ImageFrame : public ImageFrameSuper {
public:
  ImageFrame(nsIContent* aContent, nsIFrame* aParentFrame);

  NS_IMETHOD DeleteFrame();
  NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const;
  NS_IMETHOD Paint(nsIPresContext& aPresContext,
                   nsIRenderingContext& aRenderingContext,
                   const nsRect& aDirtyRect);
  NS_METHOD HandleEvent(nsIPresContext& aPresContext,
                        nsGUIEvent* aEvent,
                        nsEventStatus& aEventStatus);
  NS_IMETHOD GetCursorAt(nsIPresContext& aPresContext,
                         const nsPoint& aPoint,
                         nsIFrame** aFrame,
                         PRInt32& aCursor);

protected:
  virtual ~ImageFrame();
  void SizeOfWithoutThis(nsISizeOfHandler* aHandler) const;

  virtual void GetDesiredSize(nsIPresContext* aPresContext,
                              const nsReflowState& aReflowState,
                              nsReflowMetrics& aDesiredSize);

  nsIImageMap* GetImageMap();

  nsHTMLImageLoader mImageLoader;
  nsIImageMap* mImageMap;

  void TriggerLink(nsIPresContext& aPresContext,
                   const nsString& aURLSpec,
                   const nsString& aTargetSpec,
                   PRBool aClick);

  PRBool IsServerImageMap();
  PRIntn GetSuppress();
};

// Value's for mSuppress
#define SUPPRESS_UNSET   0
#define DONT_SUPPRESS    1
#define SUPPRESS         2
#define DEFAULT_SUPPRESS 3

// Default alignment value (so we can tell an unset value from a set value)
#define ALIGN_UNSET PRUint8(-1)

//----------------------------------------------------------------------

nsHTMLImageLoader::nsHTMLImageLoader()
{
  mImageLoader = nsnull;
  mLoadImageFailed = PR_FALSE;
  mLoadBrokenImageFailed = PR_FALSE;
  mURLSpec = nsnull;
}

nsHTMLImageLoader::~nsHTMLImageLoader()
{
  NS_IF_RELEASE(mImageLoader);
  if (nsnull != mURLSpec) {
    delete mURLSpec;
  }
}

void
nsHTMLImageLoader::SizeOf(nsISizeOfHandler* aHandler) const
{
  aHandler->Add(sizeof(*this));
  if (!aHandler->HaveSeen(mURLSpec)) {
    mURLSpec->SizeOf(aHandler);
  }
  if (!aHandler->HaveSeen(mImageLoader)) {
    mImageLoader->SizeOf(aHandler);
  }
}

nsIImage*
nsHTMLImageLoader::GetImage()
{
  nsIImage* image = nsnull;
  if (nsnull != mImageLoader) {
    mImageLoader->GetImage(image);
  }
  return image;
}

nsresult
nsHTMLImageLoader::SetURL(const nsString& aURLSpec)
{
  if (nsnull != mURLSpec) {
    delete mURLSpec;
  }
  mURLSpec = new nsString(aURLSpec);
  if (nsnull == mURLSpec) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  return NS_OK;
}

nsresult
nsHTMLImageLoader::LoadImage(nsIPresContext* aPresContext,
                             nsIFrame* aForFrame,
                             PRBool aNeedSizeUpdate,
                             PRIntn& aLoadStatus)
{
  aLoadStatus = NS_IMAGE_LOAD_STATUS_NONE;

  // Get absolute url the first time through
  nsresult rv;
  nsAutoString src;
  if (mLoadImageFailed || (nsnull == mURLSpec)) {
    src.Append(BROKEN_IMAGE_URL);
  } else {
    nsAutoString baseURL;

    // Get documentURL
    nsIPresShell* shell;
    shell = aPresContext->GetShell();
    nsIDocument* doc = shell->GetDocument();
    nsIURL* docURL = doc->GetDocumentURL();

    // Create an absolute URL
    nsresult rv = NS_MakeAbsoluteURL(docURL, baseURL, *mURLSpec, src);

    // Release references
    NS_RELEASE(shell);
    NS_RELEASE(docURL);
    NS_RELEASE(doc);
    if (NS_OK != rv) {
      return rv;
    }
  }

  if (nsnull == mImageLoader) {
    // Start image loading. Note that we don't specify a background color
    // so transparent images are always rendered using a transparency mask
    rv = aPresContext->LoadImage(src, nsnull, aForFrame, aNeedSizeUpdate,
                                 mImageLoader);
    if (NS_OK != rv) {
      return rv;
    }
  }

  // Examine current image load status
  mImageLoader->GetImageLoadStatus(aLoadStatus);
  if (0 != (aLoadStatus & NS_IMAGE_LOAD_STATUS_ERROR)) {
    NS_RELEASE(mImageLoader);
    if (mLoadImageFailed) {
      // We are doomed. Loading the broken image has just failed.
      mLoadBrokenImageFailed = PR_TRUE;
    }
    else {
      // Try again, this time using the broke-image url
      mLoadImageFailed = PR_TRUE;
      return LoadImage(aPresContext, aForFrame, aNeedSizeUpdate, aLoadStatus);
    }
  }
  return NS_OK;
}

void
nsHTMLImageLoader::GetDesiredSize(nsIPresContext* aPresContext,
                                  const nsReflowState& aReflowState,
                                  nsReflowMetrics& aDesiredSize)
{
  nsSize styleSize;
  PRIntn ss = nsCSSLayout::GetStyleSize(aPresContext, aReflowState, styleSize);
  PRIntn loadStatus;
  if (0 != ss) {
    if (NS_SIZE_HAS_BOTH == ss) {
      LoadImage(aPresContext, aReflowState.frame, PR_FALSE, loadStatus);
      aDesiredSize.width = styleSize.width;
      aDesiredSize.height = styleSize.height;
    }
    else {
      // Preserve aspect ratio of image with unbound dimension.
      LoadImage(aPresContext, aReflowState.frame, PR_TRUE, loadStatus);
      if ((0 == (loadStatus & NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE)) ||
          (nsnull == mImageLoader)) {
        // Provide a dummy size for now; later on when the image size
        // shows up we will reflow to the new size.
        aDesiredSize.width = 1;
        aDesiredSize.height = 1;
      }
      else {
        float p2t = aPresContext->GetPixelsToTwips();
        nsSize imageSize;
        mImageLoader->GetSize(imageSize);
        float imageWidth = imageSize.width * p2t;
        float imageHeight = imageSize.height * p2t;
        if (0.0f != imageHeight) {
          if (0 != (ss & NS_SIZE_HAS_WIDTH)) {
            // We have a width, and an auto height. Compute height
            // from width.
            aDesiredSize.width = styleSize.width;
            aDesiredSize.height =
              nscoord(styleSize.width * imageHeight / imageWidth);
          }
          else {
            // We have a height and an auto width. Compute width from
            // height.
            aDesiredSize.height = styleSize.height;
            aDesiredSize.width =
              nscoord(styleSize.height * imageWidth / imageHeight);
          }
        }
        else {
          // Screwy image
          aDesiredSize.width = 1;
          aDesiredSize.height = 1;
        }
      }
    }
  }
  else {
    LoadImage(aPresContext, aReflowState.frame, PR_TRUE, loadStatus);
    if ((0 == (loadStatus & NS_IMAGE_LOAD_STATUS_SIZE_AVAILABLE)) ||
        (nsnull == mImageLoader)) {
      // Provide a dummy size for now; later on when the image size
      // shows up we will reflow to the new size.
      aDesiredSize.width = 1;
      aDesiredSize.height = 1;
    } else {
      float p2t = aPresContext->GetPixelsToTwips();
      nsSize imageSize;
      mImageLoader->GetSize(imageSize);
      aDesiredSize.width = nscoord(imageSize.width * p2t);
      aDesiredSize.height = nscoord(imageSize.height * p2t);
    }
  }
}

//----------------------------------------------------------------------

ImageFrame::ImageFrame(nsIContent* aContent, nsIFrame* aParentFrame)
  : nsLeafFrame(aContent, aParentFrame)
{
}

ImageFrame::~ImageFrame()
{
}

NS_METHOD
ImageFrame::DeleteFrame()
{
  NS_IF_RELEASE(mImageMap);

  // Release image loader first so that it's refcnt can go to zero
  mImageLoader.DestroyLoader();

  return nsLeafFrame::DeleteFrame();
}

NS_IMETHODIMP
ImageFrame::SizeOf(nsISizeOfHandler* aHandler) const
{
  aHandler->Add(sizeof(*this));
  ImageFrame::SizeOfWithoutThis(aHandler);
  return NS_OK;
}

void
ImageFrame::SizeOfWithoutThis(nsISizeOfHandler* aHandler) const
{
  ImageFrameSuper::SizeOfWithoutThis(aHandler);
  mImageLoader.SizeOf(aHandler);
  if (!aHandler->HaveSeen(mImageMap)) {
    mImageMap->SizeOf(aHandler);
  }
}

void
ImageFrame::GetDesiredSize(nsIPresContext* aPresContext,
                           const nsReflowState& aReflowState,
                           nsReflowMetrics& aDesiredSize)
{
  nsHTMLBase::CreateViewForFrame(aPresContext, this, mStyleContext, PR_TRUE);

  // Setup url before starting the image load
  nsAutoString src;
  if (eContentAttr_HasValue == mContent->GetAttribute("SRC", src)) {
    mImageLoader.SetURL(src);
  }
  mImageLoader.GetDesiredSize(aPresContext, aReflowState, aDesiredSize);
}

NS_METHOD
ImageFrame::Paint(nsIPresContext& aPresContext,
                  nsIRenderingContext& aRenderingContext,
                  const nsRect& aDirtyRect)
{
  if ((0 == mRect.width) || (0 == mRect.height)) {
    // Do not render when given a zero area. This avoids some useless
    // scaling work while we wait for our image dimensions to arrive
    // asynchronously.
    return NS_OK;
  }

  const nsStyleDisplay* disp =
    (const nsStyleDisplay*)mStyleContext->GetStyleData(eStyleStruct_Display);

  if (disp->mVisible) {
    // First paint background and borders
    nsLeafFrame::Paint(aPresContext, aRenderingContext, aDirtyRect);

    // XXX when we don't have the image, draw the we-don't-have-an-image look

    nsIImage* image = mImageLoader.GetImage();
    if (nsnull == image) {
      // No image yet
      return NS_OK;
    }

    // Now render the image into our inner area (the area without the
    // borders and padding)
    nsRect inner;
    GetInnerArea(&aPresContext, inner);
    if (mImageLoader.GetLoadImageFailed()) {
      float p2t = aPresContext.GetPixelsToTwips();
      inner.width = nscoord(p2t * image->GetWidth());
      inner.height = nscoord(p2t * image->GetHeight());
    }
    aRenderingContext.DrawImage(image, inner);

    if (GetShowFrameBorders()) {
      nsIImageMap* map = GetImageMap();
      if (nsnull != map) {
        aRenderingContext.SetColor(NS_RGB(0, 0, 0));
        aRenderingContext.PushState();
        aRenderingContext.Translate(inner.x, inner.y);
          map->Draw(aPresContext, aRenderingContext);
          aRenderingContext.PopState();
      }
    }
  }

  return NS_OK;
}

nsIImageMap*
ImageFrame::GetImageMap()
{
  if (nsnull == mImageMap) {
    nsAutoString usemap;
    mContent->GetAttribute("usemap", usemap);
    if (0 == usemap.Length()) {
      return nsnull;
    }

    nsIDocument* doc = nsnull;
    mContent->GetDocument(doc);
    if (nsnull == doc) {
      return nsnull;
    }

    if (usemap.First() == '#') {
      usemap.Cut(0, 1);
    }
    nsIHTMLDocument* hdoc;
    nsresult rv = doc->QueryInterface(kIHTMLDocumentIID, (void**)&hdoc);
    NS_RELEASE(doc);
    if (NS_OK == rv) {
      nsIImageMap* map;
      rv = hdoc->GetImageMap(usemap, &map);
      NS_RELEASE(hdoc);
      if (NS_OK == rv) {
        mImageMap = map;
      }
    }
  }
  NS_IF_ADDREF(mImageMap);
  return mImageMap;
}

void
ImageFrame::TriggerLink(nsIPresContext& aPresContext,
                        const nsString& aURLSpec,
                        const nsString& aTargetSpec,
                        PRBool aClick)
{
  nsILinkHandler* handler = nsnull;
  aPresContext.GetLinkHandler(&handler);
  if (nsnull != handler) {
    if (aClick) {
      handler->OnLinkClick(this, aURLSpec, aTargetSpec);
    }
    else {
      handler->OnOverLink(this, aURLSpec, aTargetSpec);
    }
  }
}

PRBool
ImageFrame::IsServerImageMap()
{
  nsAutoString ismap;
  return eContentAttr_HasValue == mContent->GetAttribute("ismap", ismap);
}

PRIntn
ImageFrame::GetSuppress()
{
  nsAutoString s;
  if (eContentAttr_HasValue == mContent->GetAttribute("ismap", s)) {
    if (s.EqualsIgnoreCase("true")) {
      return SUPPRESS;
    } else if (s.EqualsIgnoreCase("false")) {
      return DONT_SUPPRESS;
    }
  }
  return DEFAULT_SUPPRESS;
}

// XXX what should clicks on transparent pixels do?
NS_METHOD
ImageFrame::HandleEvent(nsIPresContext& aPresContext,
                        nsGUIEvent* aEvent,
                        nsEventStatus& aEventStatus)
{
  nsIImageMap* map;
  aEventStatus = nsEventStatus_eIgnore; 

  switch (aEvent->message) {
  case NS_MOUSE_LEFT_BUTTON_UP:
  case NS_MOUSE_MOVE:
    map = GetImageMap();
    if ((nsnull != map) || IsServerImageMap()) {
      nsIURL* docURL = nsnull;
      nsIDocument* doc = nsnull;
      mContent->GetDocument(doc);
      if (nsnull != doc) {
        docURL = doc->GetDocumentURL();
        NS_RELEASE(doc);
      }

      // Ask map if the x,y coordinates are in a clickable area
      float t2p = aPresContext.GetTwipsToPixels();
      nsAutoString absURL, target, altText;
      PRBool suppress;
      if (nsnull != map) {
        // Subtract out border and padding here so that we are looking
        // at the right coordinates. Hit detection against area tags
        // is done after the mouse wanders over the image, not over
        // the image's borders.
        nsRect inner;
        GetInnerArea(&aPresContext, inner);
        nscoord x = nscoord(t2p * (aEvent->point.x - inner.x));
        nscoord y = nscoord(t2p * (aEvent->point.y - inner.y));
        nsresult r = map->IsInside(x, y, docURL, absURL, target, altText,
                                   &suppress);
        NS_IF_RELEASE(docURL);
        NS_RELEASE(map);
        if (NS_OK == r) {
          // We hit a clickable area. Time to go somewhere...
          PRBool clicked = PR_FALSE;
          if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
            aEventStatus = nsEventStatus_eConsumeNoDefault; 
            clicked = PR_TRUE;
          }
          TriggerLink(aPresContext, absURL, target, clicked);
        }
      }
      else {
        suppress = GetSuppress();
        nsAutoString baseURL;/* XXX */
        nsAutoString src;
        mContent->GetAttribute("src", src);
        NS_MakeAbsoluteURL(docURL, baseURL, src, absURL);

        // Note: We don't subtract out the border/padding here to remain
        // compatible with navigator. [ick]
        nscoord x = nscoord(t2p * aEvent->point.x);
        nscoord y = nscoord(t2p * aEvent->point.y);
        char cbuf[50];
        PR_snprintf(cbuf, sizeof(cbuf), "?%d,%d", x, y);
        absURL.Append(cbuf);
        PRBool clicked = PR_FALSE;
        if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP) {
          aEventStatus = nsEventStatus_eConsumeNoDefault; 
          clicked = PR_TRUE;
        }
        TriggerLink(aPresContext, absURL, target, clicked);
      }
      break;
    }
    // FALL THROUGH

  default:
    // Let default event handler deal with it
    return nsLeafFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
  }
  return NS_OK;
}

NS_METHOD
ImageFrame::GetCursorAt(nsIPresContext& aPresContext,
                        const nsPoint& aPoint,
                        nsIFrame** aFrame,
                        PRInt32& aCursor)
{
  // The default cursor is to have no cursor
  aCursor = NS_STYLE_CURSOR_INHERIT;

  const nsStyleColor* styleColor = (const nsStyleColor*)
    mStyleContext->GetStyleData(eStyleStruct_Color);
  if (styleColor->mCursor != NS_STYLE_CURSOR_INHERIT) {
    // If we have a particular cursor, use it
    *aFrame = this;
    aCursor = (PRInt32) styleColor->mCursor;
  }

  nsIImageMap* map = GetImageMap();
  if (nsnull != map) {
    nsRect inner;
    GetInnerArea(&aPresContext, inner);
    aCursor = NS_STYLE_CURSOR_DEFAULT;
    float t2p = aPresContext.GetTwipsToPixels();
    nscoord x = nscoord(t2p * (aPoint.x - inner.x));
    nscoord y = nscoord(t2p * (aPoint.y - inner.y));
    if (NS_OK == map->IsInside(x, y)) {
      aCursor = NS_STYLE_CURSOR_HAND;
    }
    NS_RELEASE(map);
  }

  return NS_OK;
}

//----------------------------------------------------------------------

nsHTMLImage::nsHTMLImage(nsIAtom* aTag)
  : nsHTMLTagContent(aTag)
{
}

nsHTMLImage::~nsHTMLImage()
{
}

NS_IMETHODIMP
nsHTMLImage::SizeOf(nsISizeOfHandler* aHandler) const
{
  aHandler->Add(sizeof(*this));
  nsHTMLImage::SizeOfWithoutThis(aHandler);
  return NS_OK;
}

void
nsHTMLImage::SizeOfWithoutThis(nsISizeOfHandler* aHandler) const
{
}

void
nsHTMLImage::SetAttribute(nsIAtom* aAttribute, const nsString& aString)
{
  nsHTMLValue val;
  if (aAttribute == nsHTMLAtoms::ismap) {
    val.SetEmptyValue();
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else if (aAttribute == nsHTMLAtoms::usemap) {
    nsAutoString usemap(aString);
    usemap.StripWhitespace();
    val.SetStringValue(usemap);
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else if (aAttribute == nsHTMLAtoms::align) {
    if (ParseAlignParam(aString, val)) {
      // Reflect the attribute into the syle system
      nsHTMLTagContent::SetAttribute(aAttribute, val);
    }
    else {
      val.SetStringValue(aString);
      nsHTMLTagContent::SetAttribute(aAttribute, val);
    }
  }
  else if (aAttribute == nsHTMLAtoms::src) {
    nsAutoString src(aString);
    src.StripWhitespace();
    val.SetStringValue(src);
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else if (aAttribute == nsHTMLAtoms::lowsrc) {
    nsAutoString lowsrc(aString);
    lowsrc.StripWhitespace();
    val.SetStringValue(lowsrc);
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else if (aAttribute == nsHTMLAtoms::alt) {
    val.SetStringValue(aString);
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else if (aAttribute == nsHTMLAtoms::suppress) {
    PRIntn suppress = DEFAULT_SUPPRESS;
    if (aString.EqualsIgnoreCase("true")) {
      suppress = SUPPRESS;
    }
    else if (aString.EqualsIgnoreCase("false")) {
      suppress = DONT_SUPPRESS;
    }
    val.SetIntValue(suppress, eHTMLUnit_Enumerated);
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else if (ParseImageProperty(aAttribute, aString, val)) {
    nsHTMLTagContent::SetAttribute(aAttribute, val);
  }
  else {
    // Use default attribute catching code
    nsHTMLImageSuper::SetAttribute(aAttribute, aString);
  }
}

nsContentAttr
nsHTMLImage::AttributeToString(nsIAtom* aAttribute,
                               nsHTMLValue& aValue,
                               nsString& aResult) const
{
  nsContentAttr ca = eContentAttr_NotThere;
  if (aAttribute == nsHTMLAtoms::align) {
    if (eHTMLUnit_Enumerated == aValue.GetUnit()) {
      AlignParamToString(aValue, aResult);
      ca = eContentAttr_HasValue;
    }
  }
  else if (aAttribute == nsHTMLAtoms::suppress) {
    aResult.Truncate();
    switch (aValue.GetIntValue()) {
    case SUPPRESS:         aResult.Append("true"); break;
    case DONT_SUPPRESS:    aResult.Append("false"); break;
    case DEFAULT_SUPPRESS: break;
    }
    ca = eContentAttr_HasValue;
  }
  else if (ImagePropertyToString(aAttribute, aValue, aResult)) {
    ca = eContentAttr_HasValue;
  }
  return ca;
}

void
nsHTMLImage::MapAttributesInto(nsIStyleContext* aContext, 
                               nsIPresContext* aPresContext)
{
  if (nsnull != mAttributes) {
    nsHTMLValue value;
    GetAttribute(nsHTMLAtoms::align, value);
    if (value.GetUnit() == eHTMLUnit_Enumerated) {
      PRUint8 align = value.GetIntValue();
      nsStyleDisplay* display = (nsStyleDisplay*)
        aContext->GetMutableStyleData(eStyleStruct_Display);
      nsStyleText* text = (nsStyleText*)
        aContext->GetMutableStyleData(eStyleStruct_Text);
      nsStyleSpacing* spacing = (nsStyleSpacing*)
        aContext->GetMutableStyleData(eStyleStruct_Spacing);
      float p2t = aPresContext->GetPixelsToTwips();
      nsStyleCoord three(nscoord(p2t*3));
      switch (align) {
      case NS_STYLE_TEXT_ALIGN_LEFT:
        display->mFloats = NS_STYLE_FLOAT_LEFT;
        spacing->mMargin.SetLeft(three);
        spacing->mMargin.SetRight(three);
        break;
      case NS_STYLE_TEXT_ALIGN_RIGHT:
        display->mFloats = NS_STYLE_FLOAT_RIGHT;
        spacing->mMargin.SetLeft(three);
        spacing->mMargin.SetRight(three);
        break;
      default:
        text->mVerticalAlign.SetIntValue(align, eStyleUnit_Enumerated);
        break;
      }
    }
  }
  MapImagePropertiesInto(aContext, aPresContext);
  MapImageBorderInto(aContext, aPresContext, nsnull);
}

nsresult
nsHTMLImage::CreateFrame(nsIPresContext* aPresContext,
                         nsIFrame* aParentFrame,
                         nsIStyleContext* aStyleContext,
                         nsIFrame*& aResult)
{
  ImageFrame* frame = new ImageFrame(this, aParentFrame);
  if (nsnull == frame) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  aResult = frame;
  frame->SetStyleContext(aPresContext, aStyleContext);
  return NS_OK;
}

nsresult
NS_NewHTMLImage(nsIHTMLContent** aInstancePtrResult,
                nsIAtom* aTag)
{
  NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
  if (nsnull == aInstancePtrResult) {
    return NS_ERROR_NULL_POINTER;
  }
  nsIHTMLContent* img = new nsHTMLImage(aTag);
  if (nsnull == img) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  return img->QueryInterface(kIHTMLContentIID, (void **) aInstancePtrResult);
}