gecko-dev/gfx/public/nsIBlender.h

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/* -*- 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
* 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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 nsIBlender_h___
#define nsIBlender_h___
#include "nscore.h"
#include "nsISupports.h"
#include "nsIRenderingContext.h"
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// IID for the nsIBlender interface
#define NS_IBLENDER_IID \
{ 0xbdb4b5b0, 0xf0db, 0x11d1, \
{ 0xa8, 0x2a, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
//----------------------------------------------------------------------
// Blender interface
class nsIBlender : public nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IBLENDER_IID)
/**
* Initialize the Blender
* @update dc 11/4/98
* @param aContext is where the blender can get info about the device its blending on
* @result The result of the initialization, NS_OK if no errors
*/
NS_IMETHOD Init(nsIDeviceContext *aContext) = 0;
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/**
* NOTE: if we can make this static, that would be great. I don't think we can.
* Blend source and destination nsDrawingSurfaces. Both drawing surfaces
* will have bitmaps associated with them.
* @param aSX x offset into source drawing surface of blend area
* @param aSY y offset into source drawing surface of blend area
* @param aWidth width of blend area
* @param aHeight width of blend area
* @param aSrc source for the blending
* @param aDest destination for blending
* @param aDX x offset into destination drawing surface of blend area
* @param aDY y offset into destination drawing surface of blend area
* @param aSrcOpacity 0.0f -> 1.0f opacity value of source area. 1.0f indicates
* complete opacity.
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* @param aSecondSrc an optional second source drawing surface which is used in
* conjunction with the background color parameters to determine
* which pixels to blend
* @param aSrcBackColor color of pixels in aSrc that should be
* considered "background" color
* @param aSecondSrcBackColor color of pixels in aSrc that should be
* considered "background" color
*/
NS_IMETHOD Blend(PRInt32 aSX, PRInt32 aSY, PRInt32 aWidth, PRInt32 aHeight,nsIDrawingSurface* aSrc,
nsIDrawingSurface* aDest, PRInt32 aDX, PRInt32 aDY, float aSrcOpacity,
nsIDrawingSurface* aSecondSrc = nsnull, nscolor aSrcBackColor = NS_RGB(0, 0, 0),
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nscolor aSecondSrcBackColor = NS_RGB(0, 0, 0)) = 0;
NS_IMETHOD Blend(PRInt32 aSX, PRInt32 aSY, PRInt32 aWidth, PRInt32 aHeight, nsIRenderingContext *aSrc,
nsIRenderingContext *aDest, PRInt32 aDX, PRInt32 aDY, float aSrcOpacity,
nsIRenderingContext *aSecondSrc = nsnull, nscolor aSrcBackColor = NS_RGB(0, 0, 0),
nscolor aSecondSrcBackColor = NS_RGB(0, 0, 0)) = 0;
/**
GetAlphas computes an array of alpha values for a rectangle of pixels, using
the drawn-onto-black and the drawn-onto-white images. The pixels are
returned in a new'ed array of aRect.width*aRect.height elements, in row-major
order. This array must be freed by the caller.
*/
NS_IMETHOD GetAlphas(const nsRect& aRect, nsIDrawingSurface* aBlack,
nsIDrawingSurface* aWhite, PRUint8** aAlphas) = 0;
};
#endif