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) 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 huitextureautosizeparams texture class. |
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* |
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*/ |
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#ifndef C_HUITEXTUREAUTOSIZEPARAMS_H |
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#define C_HUITEXTUREAUTOSIZEPARAMS_H |
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#include <e32std.h> |
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/** |
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* Texture auto size parameters. These can be used to control texture |
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* resizing when automatic size calculation is enabled. Actual behaviour |
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* of parameters may depend also on the used renderer, e.g. texture |
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* resizing algorithm may be more aggressive in BitGdi than in |
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* OpenGLES renderer. |
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* |
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* Example of use |
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* @code |
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* texture->EnableAutoSizeCalculation(); |
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* THuiTextureAutoSizeParams newparams = texture->AutoSizeParams(); |
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* newparams.SetSizeLowerThreshold(THuiTextureAutoSizeParams::EHigh); |
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* newparams.SetSizeUpperThreshold(THuiTextureAutoSizeParams::ELow); |
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* texture->SetAutoSizeParams(newparams); |
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* @endcode |
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* |
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*/ |
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NONSHARABLE_CLASS( THuiTextureAutoSizeParams ) |
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{ |
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|
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public: |
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|
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enum |
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{ |
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EVeryLow = -20, |
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ELow = -10, |
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EMedium = 0, |
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EHigh = 10, |
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EVeryHigh = 20 |
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}; |
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/** |
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* Constructor. |
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*/ |
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IMPORT_C THuiTextureAutoSizeParams(); |
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|
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/** |
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* Gets a size threshold which defines how much required size may |
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* decrease before it is considered to be small enough to |
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* cause texture resizing. |
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* |
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* @return Texture downsize threshold |
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*/ |
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IMPORT_C TInt SizeLowerThreshold() const; |
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/** |
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* Sets a size threshold which defines how much required size may |
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* decrease before it is considered to be small enough to |
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* cause texture resizing. |
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* |
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* Exmple: Setting value to EVeryLow causes texture to be |
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* very easily resized to a smaller size if needed. |
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* |
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* @param aSizeLowerThreshold Texture downscale threshold |
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*/ |
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IMPORT_C void SetSizeLowerThreshold(TInt aSizeLowerThreshold); |
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/** |
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* Gets a size threshold which defines how much required size may |
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* increase before it is considered to be big enough to |
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* cause texture resizing. |
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* |
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* @return Texture upscale threshold |
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*/ |
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IMPORT_C TInt SizeUpperThreshold() const; |
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/** |
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* Sets a size threshold which defines how much required size may |
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* increase before it is considered to be big enough to |
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* cause texture resizing. |
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* |
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* Exmple: Setting value to EVeryLow causes texture to be |
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* very easily resized to a larger size if needed. |
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* |
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* @param aSizeUpperThreshold Texture upscale threshold |
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*/ |
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IMPORT_C void SetSizeUpperThreshold(TInt aSizeUpperThreshold); |
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/** |
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* Gets the minumum amount of resize. If height or width difference |
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* between current size and required size is smaller than threshold |
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* specified by this value, resizing is not done |
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* (except if the current texture size is zero). |
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* @return aMinSizeChange |
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*/ |
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IMPORT_C TInt MinSizeChange() const; |
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|
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/** |
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* Sets the minumum amount of resize. If height or width difference |
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* between current size and required size is smaller than threshold |
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* specified by this value, resizing is not done |
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* (except if the current texture size is zero). |
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* |
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* Exmple: Setting value to EHigh can be used to prevent unnecessary |
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* size changes if the required size varies often but changes are small. |
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* |
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* @param aMinSizeChange |
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*/ |
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IMPORT_C void SetMinSizeChange(TInt aMinSizeChange); |
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|
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/** |
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* Gets size threshold under which relative resizing calculations are |
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* settled to be less aggressive than specified. This is used to avoid unnecessary |
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* resizing when texture size is very small (small pixel changes may be large |
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* relative changes) |
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* |
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* @return Size threshold. |
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*/ |
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IMPORT_C TInt DownsizeSettleThreshold() const; |
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|
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/** |
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* Sets size threshold under which relative resizing calculations are |
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* settled to be less aggressive than specified. This is used to avoid unnecessary |
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* resizing when texture size is very small (small pixel changes may be large |
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* relative changes) |
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* |
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* @param aDownsizeSettlethreshold Size threshold. |
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*/ |
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IMPORT_C void SetDownsizeSettleThreshold(TInt aDownsizeSettleThreshold); |
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|
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|
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private: |
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|
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/** Lower size threshold */ |
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TInt iSizeLowerThreshold; |
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/** Higher size threshold */ |
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TInt iSizeUpperThreshold; |
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/** Min resize amount that makes sense to do */ |
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TInt iMinSizeChange; |
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/** Size when texture is so small that relative lower/upper thresholds are no more followed strictly */ |
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TInt iDownsizeSettleThreshold; |
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/** Reserved for future use */ |
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TInt iSpare[10]; |
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}; |
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#endif |