author Brian Birtles <>
Sun, 25 Sep 2011 22:04:32 +0100
changeset 77557 c9a9397f6db3e27cff0cf5ba8ed1fa4c3b9d85c2
parent 58894 395fac6a7de431827a5254d47ed92c5dafa8b489
child 77799 e7854b4d29ba905ae3994f821b160c989bac4260
permissions -rw-r--r--
Bug 602759 part 13 - Update layout to use new matrix and transform types; r=jwatt

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 * The Original Code is the Mozilla SVG project.
 * The Initial Developer of the Original Code is IBM Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * ***** END LICENSE BLOCK ***** */


#include "nsSVGContainerFrame.h"
#include "gfxMatrix.h"

typedef nsSVGContainerFrame nsSVGClipPathFrameBase;

class nsSVGClipPathFrame : public nsSVGClipPathFrameBase
  friend nsIFrame*
  NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
  nsSVGClipPathFrame(nsStyleContext* aContext) :
    mInUse(PR_FALSE) {}


  // nsSVGClipPathFrame methods:
  nsresult ClipPaint(nsSVGRenderState* aContext,
                     nsIFrame* aParent,
                     const gfxMatrix &aMatrix);

  PRBool ClipHitTest(nsIFrame* aParent,
                     const gfxMatrix &aMatrix,
                     const nsPoint &aPoint);

  // Check if this clipPath is made up of more than one geometry object.
  // If so, the clipping API in cairo isn't enough and we need to use
  // mask based clipping.
  PRBool IsTrivial();

  PRBool IsValid();

  // nsIFrame interface:
  NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType);

  NS_IMETHOD Init(nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsIFrame*        aPrevInFlow);

   * Get the "type" of the frame
   * @see nsGkAtoms::svgClipPathFrame
  virtual nsIAtom* GetType() const;

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const
    return MakeFrameName(NS_LITERAL_STRING("SVGClipPath"), aResult);

  // A helper class to allow us to paint clip paths safely. The helper
  // automatically sets and clears the mInUse flag on the clip path frame
  // (to prevent nasty reference loops). It's easy to mess this up
  // and break things, so this helper makes the code far more robust.
  class AutoClipPathReferencer
    AutoClipPathReferencer(nsSVGClipPathFrame *aFrame)
       : mFrame(aFrame) {
      NS_ASSERTION(!mFrame->mInUse, "reference loop!");
      mFrame->mInUse = PR_TRUE;
    ~AutoClipPathReferencer() {
      mFrame->mInUse = PR_FALSE;
    nsSVGClipPathFrame *mFrame;

  nsIFrame *mClipParent;
  nsAutoPtr<gfxMatrix> mClipParentMatrix;
  // recursion prevention flag
  PRPackedBool mInUse;

  // nsSVGContainerFrame methods:
  virtual gfxMatrix GetCanvasTM();