gecko-dev/content/canvas/public/nsICanvasElement.h

/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 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
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 *
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 *   Vladimir Vukicevic <vladimir@pobox.com>
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *
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#ifndef nsICanvasElement_h___
#define nsICanvasElement_h___

#include "nsISupports.h"
#include "nsIFrame.h"

// {C234660C-BD06-493e-8583-939A5A158B37}
#define NS_ICANVASELEMENT_IID \
    { 0xc234660c, 0xbd06, 0x493e, { 0x85, 0x83, 0x93, 0x9a, 0x5a, 0x15, 0x8b, 0x37 } }

class nsIRenderingContext;

struct _cairo_surface;

class nsICanvasElement : public nsISupports {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICANVASELEMENT_IID)

  /**
   * Ask the canvas Element to return the primary frame, if any
   */
  NS_IMETHOD GetPrimaryCanvasFrame (nsIFrame **aFrame) = 0;

  /**
   * Get the size in pixels of this canvas element
   */
  NS_IMETHOD GetSize (PRUint32 *width, PRUint32 *height) = 0;

  /*
   * Ask the canvas element to tell the contexts to render themselves
   * into the given nsIRenderingContext at the origin.
   */
  NS_IMETHOD RenderContexts (nsIRenderingContext *rc) = 0;

  /*
   * Ask the canvas element to tell the contexts to render themselves
   * into to given cairo_surface_t.
   */
  NS_IMETHOD RenderContextsToSurface (struct _cairo_surface *surf) = 0;
  
  /**
   * Determine whether the canvas is write-only.
   */
  virtual PRBool IsWriteOnly() = 0;

  /**
   * Force the canvas to be write-only.
   */
  virtual void SetWriteOnly() = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsICanvasElement, NS_ICANVASELEMENT_IID)

#endif /* nsICanvasElement_h___ */