gecko-dev/content/canvas/public/nsICanvasRenderingContextIn...

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/* -*- Mode: C++; tab-width: 40; 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
* http://www.mozilla.org/MPL/
*
* 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 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.
*
* 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
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* ***** END LICENSE BLOCK ***** */
#ifndef nsICanvasRenderingContextInternal_h___
#define nsICanvasRenderingContextInternal_h___
#include "nsISupports.h"
#include "nsICanvasElement.h"
#include "nsIInputStream.h"
// {eab854fd-aa5e-44bb-8cc5-8d02f84b0216}
#define NS_ICANVASRENDERINGCONTEXTINTERNAL_IID \
{ 0xeab854fd, 0xaa5e, 0x44bb, { 0x8c, 0xc5, 0x8d, 0x02, 0xf8, 0x4b, 0x02, 0x16 } }
class gfxContext;
class gfxASurface;
class nsICanvasRenderingContextInternal : public nsISupports {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
// This method should NOT hold a ref to aParentCanvas; it will be called
// with nsnull when the element is going away.
NS_IMETHOD SetCanvasElement(nsICanvasElement* aParentCanvas) = 0;
// Sets the dimensions of the canvas, in pixels. Called
// whenever the size of the element changes.
NS_IMETHOD SetDimensions(PRInt32 width, PRInt32 height) = 0;
// Render the canvas at the origin of the given gfxContext
NS_IMETHOD Render(gfxContext *ctx) = 0;
// Gives you a stream containing the image represented by this context.
// The format is given in aMimeTime, for example "image/png".
//
// If the image format does not support transparency or aIncludeTransparency
// is false, alpha will be discarded and the result will be the image
// composited on black.
NS_IMETHOD GetInputStream(const char *aMimeType,
const PRUnichar *aEncoderOptions,
nsIInputStream **aStream) = 0;
// If this canvas context can be represented with a simple Thebes surface,
// return the surface. Otherwise returns an error.
NS_IMETHOD GetThebesSurface(gfxASurface **surface) = 0;
// If this context is opaque, the backing store of the canvas should
// be created as opaque; all compositing operators should assume the
// dst alpha is always 1.0. If this is never called, the context
// defaults to false (not opaque).
NS_IMETHOD SetIsOpaque(PRBool isOpaque) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsICanvasRenderingContextInternal,
NS_ICANVASRENDERINGCONTEXTINTERNAL_IID)
#endif /* nsICanvasRenderingContextInternal_h___ */