author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 07:56:43 +0200 | |
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/* |
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* Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Declares CAlfTextureProcessor class. |
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* |
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*/ |
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#ifndef C_ALFTEXTUREPROCESSOR_H |
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#define C_ALFTEXTUREPROCESSOR_H |
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#include <e32base.h> |
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/* Forward declarations. */ |
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class CAlfEnv; |
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class CAlfTexture; |
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/** |
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* CAlfTextureProcessor is a collection of texture filters. Each filter |
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* takes a texture as input, processes it, and produces a new texture as a |
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* result. Examples of processing filters are blurring and shadow generation. |
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* Concrete serverside implementations of this class are rendering plugin specific. |
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* CAlfTextureProcessor is the public, user-friendly way of filtering |
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* textures, because each filtering operation can be applied with a single |
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* function call. |
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* Usage: |
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* @code |
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* //Get texture processor |
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* CAlfTextureProcessor* textureProcessor = &iTxrMgr->TextureProcessor(); |
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* |
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* //Blur texture, source and destination textures are same |
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* textureProcessor->BlurL(*tex,*tex); |
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* |
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* @endcode |
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* @see CAlfTextureProcessor::BlurL() |
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* @lib alfclient.lib |
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* @since S60 v3.2 |
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* |
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*/ |
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NONSHARABLE_CLASS(CAlfTextureProcessor) : public CBase |
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{ |
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public: |
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/* Types. */ |
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/** @beginAPI */ |
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/** Flags for blur filtering. */ |
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enum TBlurFlags |
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{ |
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/** Default blurring settings. */ |
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EBlurFlagDefault = 0, |
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/** Include an alpha channel in the result. */ |
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EBlurFlagAlpha = 1, |
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/** Retain extra space for edges so that the blurred edges that will |
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always remain within the bounds of the resulting texture. Note |
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that when the blurred texture is drawn, it has to be expanded |
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so that it will match the original images content. */ |
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EBlurFlagExpandEdges = 2, |
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/** Replace source color RGB with white. Note that this flag is |
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mutually exclusive with flag EBlurFlagBlack. If both are defined |
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then this flag overrides the EBlurFlagBlack. */ |
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EBlurFlagWhite = 4, |
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/** Replace source color RGB with black. Note that this flag is |
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mutually exclusive with flag EBlurFlagWhite. If both are defined |
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then this flag overridden by EBlurFlagWhite. */ |
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EBlurFlagBlack = 8, |
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/** High quality blur. The blurring process is done twice, and the |
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results are averaged. */ |
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EBlurFlagHighQuality = 16, |
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}; |
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/** @endAPI */ |
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/* Destructor. */ |
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/** |
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* Destructor. |
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*/ |
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virtual ~CAlfTextureProcessor(); |
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/** |
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* Constructor. |
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*/ |
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static CAlfTextureProcessor* NewL(CAlfEnv& aEnv); |
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/** |
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* Constructor. |
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*/ |
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static CAlfTextureProcessor* NewLC(CAlfEnv& aEnv); |
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/* Methods. */ |
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/** @beginAPI */ |
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/** |
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* Blurs a texture. The dimensions of the resulting image are chosen |
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* automatically. Returns a pointer to a new texture which contains |
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* a blurred version of the texture. Ownership of the new texture is |
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* transferred to the caller. |
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* |
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* Note that the algorithm used for blurring favors speed over accuracy. |
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* This means that when hardware acceleration is available, the blurring |
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* can be redone for each frame. However, the quality of the blurring |
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* may not be optimal. For example, color range reduction and pixel |
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* artifacts may be visible. |
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* |
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* @param aSrc Source texture to be blurred. Not modified. |
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* @param aDest Destination texture to be blurred. Modified. Allowed to be the same as aSrc. |
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* @param aFilterSize Size of the blurring filter. 3 = 3x3 filter, 4 = 4x4 filter. |
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* @param aFlags Flags that modify the filter's parameters. @see TBlurFlags |
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*/ |
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IMPORT_C void BlurL(const CAlfTexture& aSrc, |
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CAlfTexture& aDest, |
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TInt aFilterSize = 3, TInt aFlags = 0); |
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/** |
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* Blurs a texture. The dimensions of the resulting image are as close to |
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* aPreferredSize as possible, depending on the limitations of the |
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* implementation. Returns a pointer to a new texture which contains |
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* a blurred version of the texture. Ownership of the new texture is |
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* transferred to the caller. |
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* |
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* Note that the algorithm used for blurring favors speed over accuracy. |
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* This means that when hardware acceleration is available, the blurring |
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* can be redone for each frame. However, the quality of the blurring |
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* may not be optimal. For example, color range reduction and pixel |
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* artifacts may be visible. |
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* |
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* @param aSrc Source texture to be blurred. Not modified. |
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* @param aDest Destination texture to be blurred. Modified. Allowed to be the same as aSrc. |
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* @param aPreferredSize Preferred size of the result. |
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* @param aFilterSize Size of the blurring filter. 3 = 3x3 filter, 4 = 4x4 filter. |
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* @param aFlags Flags that modify the filter's parameters. @see TBlurFlags |
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*/ |
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IMPORT_C void BlurL(const CAlfTexture& aSrc, |
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CAlfTexture& aDest, |
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const TSize& aPreferredSize, |
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TInt aFilterSize = 3, TInt aFlag = 0); |
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/** @endAPI */ |
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protected: |
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/* Constructors. */ |
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/** |
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* Constructor. |
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*/ |
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CAlfTextureProcessor(); |
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/** |
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* Second-phase constructor. |
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*/ |
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void ConstructL(CAlfEnv& aEnv); |
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private: |
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/** Private data */ |
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struct TPrivateData; |
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TPrivateData* iData; |
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}; |
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#endif // C_ALFTEXTUREPROCESSOR_H |