svn-gvsig-desktop / trunk / libraries / libjni-mrsid / include / filters / lti_multiresFilter.h @ 3539
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/* $Id: lti_multiresFilter.h 3539 2006-01-09 12:23:20Z nacho $ */
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/* //////////////////////////////////////////////////////////////////////////
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// //
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// This code is Copyright (c) 2004 LizardTech, Inc, 1008 Western Avenue, //
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// Suite 200, Seattle, WA 98104. Unauthorized use or distribution //
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// prohibited. Access to and use of this code is permitted only under //
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// license from LizardTech, Inc. Portions of the code are protected by //
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// US and foreign patents and other filings. All Rights Reserved. //
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// //
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////////////////////////////////////////////////////////////////////////// */
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/* PUBLIC */
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#ifndef LTI_MULTIRESFILTER_H
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#define LTI_MULTIRESFILTER_H
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// lt_lib_mrsid_core
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#include "lti_imageFilter.h" |
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LT_BEGIN_NAMESPACE(LizardTech) |
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#if defined(LT_COMPILER_MS)
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#pragma warning(push,4) |
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#endif
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/**
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* add resolutions to the image
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*
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* Extends the magnification range of an image, to allow decodes at different
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* resolutions than the image stage would normally allow.
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*
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* Note that this class is not the same as at the LTIStaticZoomFilter class,
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* which scales the magnification statically for the pipeline when initially
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* constructed. This class allows for the zoom level to be extended for an
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* individual decode operation.
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*/
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class LTIMultiResFilter : public LTIImageFilter |
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{ |
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public:
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/**
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* constructor
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*
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* Creates an image stage which can be decoded at arbitrary magnifications.
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*
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* Normally image stages will only support a limited set of magnification
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* values for the LTIScene passed to LTIImageStage::read() -- often, only
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* 1.0. This class will perform any needed resampling on the fly so that
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* arbitrary (power-of-two) magnifications are supported.
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*
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* @param sourceImage the base image
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* @param takeOwnership set to true to have the filter delete the \a sourceImage
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*/
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LTIMultiResFilter(LTIImageStage* sourceImage, bool takeOwnership);
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LTIMultiResFilter(LTIImageStage* sourceImage, |
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double minMag,
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double maxMag,
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bool takeOwnership);
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virtual ~LTIMultiResFilter(); |
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virtual LT_STATUS initialize(); |
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LT_STATUS projectPointAtMag(double upperLeft,
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double mag,
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double& newUpperLeft) const; |
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LT_STATUS projectDimAtMag(double dim,
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double mag,
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double& newDim) const; |
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LT_STATUS getDimsAtMag(double mag,
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lt_uint32& width, |
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lt_uint32& height) const;
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bool getReaderScene(const LTIScene &decodeScene, |
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LTIScene &readerScene) const;
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protected:
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LT_STATUS decodeBegin(const LTIScene& scene);
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LT_STATUS decodeStrip(LTISceneBuffer& stripBuffer, |
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const LTIScene& stripScene);
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LT_STATUS decodeEnd(); |
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enum Mode
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{ |
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MODE_INVALID, |
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MODE_PASSTHROUGH, |
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MODE_DOWNSAMPLE, |
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MODE_DOWNSAMPLE_FULLREAD, |
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MODE_UPSAMPLE, |
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}; |
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void getModeAndScale(const LTIScene &scene, |
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Mode &mode, |
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double &scale) const; |
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bool getChildScene(const LTIScene &scene, |
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LTIScene &childScene) const;
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struct StripCache;
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enum
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{ |
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// The largest possible mag is based on the 2gb
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// scene limitation. Thus the largest scene we
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// should ever expect is approximately the square
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// root of (2gb / 3) pixels on a side. If we
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// assume the smallest image we'll ever encounter
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// is 32x32 then the largest magnification can
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// be calculated. It's big, but we need a real number!
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kMaxMagnification = 512 // 51200% zoom! |
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}; |
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private:
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double m_mrMinMag;
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double m_mrMaxMag;
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Mode m_mode; |
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double m_scale;
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double m_curX;
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double m_curY;
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lt_int32 m_curStrip; |
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lt_int32 m_numStrips; |
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StripCache *m_stripCache; |
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// nope
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LTIMultiResFilter(const LTIMultiResFilter&);
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LTIMultiResFilter& operator=(const LTIMultiResFilter&);
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}; |
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LT_END_NAMESPACE(LizardTech) |
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#if defined(LT_COMPILER_MS)
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#pragma warning(pop)
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#endif
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#endif // LTI_MULTIRESFILTER_H |