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109 lines
4.8 KiB
C++
109 lines
4.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIBlender_h___
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#define nsIBlender_h___
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#include "nscore.h"
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#include "nsISupports.h"
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#include "nsIRenderingContext.h"
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// IID for the nsIBlender interface
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#define NS_IBLENDER_IID \
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{ 0xbdb4b5b0, 0xf0db, 0x11d1, \
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{ 0xa8, 0x2a, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
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//----------------------------------------------------------------------
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// Blender interface
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class nsIBlender : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IBLENDER_IID)
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/**
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* Initialize the Blender
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* @update dc 11/4/98
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* @param aContext is where the blender can get info about the device its blending on
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* @result The result of the initialization, NS_OK if no errors
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*/
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NS_IMETHOD Init(nsIDeviceContext *aContext) = 0;
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/**
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* NOTE: if we can make this static, that would be great. I don't think we can.
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* Blend source and destination nsDrawingSurfaces. Both drawing surfaces
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* will have bitmaps associated with them.
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* @param aSX x offset into source drawing surface of blend area
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* @param aSY y offset into source drawing surface of blend area
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* @param aWidth width of blend area
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* @param aHeight width of blend area
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* @param aSrc source for the blending
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* @param aDest destination for blending
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* @param aDX x offset into destination drawing surface of blend area
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* @param aDY y offset into destination drawing surface of blend area
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* @param aSrcOpacity 0.0f -> 1.0f opacity value of source area. 1.0f indicates
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* complete opacity.
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* @param aSecondSrc an optional second source drawing surface which is used in
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* conjunction with the background color parameters to determine
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* which pixels to blend
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* @param aSrcBackColor color of pixels in aSrc that should be
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* considered "background" color
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* @param aSecondSrcBackColor color of pixels in aSrc that should be
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* considered "background" color
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*/
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NS_IMETHOD Blend(PRInt32 aSX, PRInt32 aSY, PRInt32 aWidth, PRInt32 aHeight,nsIDrawingSurface* aSrc,
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nsIDrawingSurface* aDest, PRInt32 aDX, PRInt32 aDY, float aSrcOpacity,
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nsIDrawingSurface* aSecondSrc = nsnull, nscolor aSrcBackColor = NS_RGB(0, 0, 0),
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nscolor aSecondSrcBackColor = NS_RGB(0, 0, 0)) = 0;
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NS_IMETHOD Blend(PRInt32 aSX, PRInt32 aSY, PRInt32 aWidth, PRInt32 aHeight, nsIRenderingContext *aSrc,
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nsIRenderingContext *aDest, PRInt32 aDX, PRInt32 aDY, float aSrcOpacity,
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nsIRenderingContext *aSecondSrc = nsnull, nscolor aSrcBackColor = NS_RGB(0, 0, 0),
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nscolor aSecondSrcBackColor = NS_RGB(0, 0, 0)) = 0;
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/**
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GetAlphas computes an array of alpha values for a rectangle of pixels, using
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the drawn-onto-black and the drawn-onto-white images. The pixels are
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returned in a new'ed array of aRect.width*aRect.height elements, in row-major
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order. This array must be freed by the caller.
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*/
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NS_IMETHOD GetAlphas(const nsRect& aRect, nsIDrawingSurface* aBlack,
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nsIDrawingSurface* aWhite, PRUint8** aAlphas) = 0;
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};
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#endif
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