svn-gvsig-desktop / trunk / libraries / libjni-mrsid / include / base / lti_sceneBuffer.h @ 3539
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/* $Id: lti_sceneBuffer.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_SCENEBUFFER_H
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#define LTI_SCENEBUFFER_H
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// lt_lib_base
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#include "lt_base.h" |
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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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LT_BEGIN_NAMESPACE(LizardTech) |
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class LTIPixel; |
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class LTIOStreamInf; |
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/**
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* class to hold data passed between image stages
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*
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* This class holds a buffer of data which is used as the target of decode
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* operations in LTIImageStage.
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*
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* The data within the buffer is always represented as an array of bytes in
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* BSQ (band-sequential) format. Each band is stored separately, so that the
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* underlying data is an array of N pointers, each array element being a
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* buffer for one band of the image.
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*
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* The dimensions of the buffer are set in the constructor. The \b total
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* number of rows and columns represents the actual extent of the data array
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* in memory. However, it is often desirable to only expose a subset of the
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* full rectangle, e.g. to access a large buffer in a stripwise fashion or to
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* overlay a small image into a large buffer. This \b window may also be set
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* via the constructor, by providing a second set of row/column dimensions
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* and giving an offset for the upper-left position of the window.
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*
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* If the data pointer passed to the constructor is NULL, the class will
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* internally allocate the required memory (and retain ownership of it).
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*
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* Functions are provided to access that data within the buffer in a variety
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* of ways, relative to both the total buffer and the exposed window within
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* it. You may also construct a buffer which is relative to another buffer.
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*
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* For convenience, a number of functions are also provided which allow the
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* user to copy data to and from an LTISceneBuffer object, using a variety of
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* formats. For example, there are functions to import and export the data
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* in the buffer to BIP (band-interleaved) format.
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*
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* @note The pixel properties of the LTISceneBuffer must exactly match the
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* pixel properties of the image being decoded.
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*/
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class LTISceneBuffer |
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{ |
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public:
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/**
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* @name Constructors and destructor
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*/
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/*@{*/
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/**
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* constructor with default window
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*
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* Constructs an LTISceneBuffer with the window set to the total region of
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* the buffer.
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*
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* The \c data parameter may be NULL, in which case the memory will be
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* allocated internally.
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*
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* @param pixelProps pixel type to be used in the buffer
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* @param totalNumCols width of the buffer
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* @param totalNumRows height of the buffer
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* @param data pointer to the data array (may be NULL)
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*/
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LTISceneBuffer(const LTIPixel& pixelProps,
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lt_uint32 totalNumCols, |
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lt_uint32 totalNumRows, |
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void** data);
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/**
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* constructor with explicit window
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*
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* Constructs an LTISceneBuffer with the window set to the given size and
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* positioned at the given offset. The offset is given relative to the
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* total region, and the window must lie entirely within the region.
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*
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* The \c data parameter may be NULL, in which case the memory will be
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* allocated internally.
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*
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* @param pixelProps pixel type to be used in the buffer
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* @param totalNumCols width of the buffer
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* @param totalNumRows height of the buffer
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* @param colOffset x-position of the window
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* @param rowOffset y-position of the window
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* @param windowNumCols width of the window
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* @param windowNumRows height of the window
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* @param data pointer to the data array (may be NULL)
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*/
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LTISceneBuffer(const LTIPixel& pixelProps,
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lt_uint32 totalNumCols, |
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lt_uint32 totalNumRows, |
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lt_uint32 colOffset, |
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lt_uint32 rowOffset, |
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lt_uint32 windowNumCols, |
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lt_uint32 windowNumRows, |
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void** data);
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/**
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* constructor to overlay existing LTISceneBuffer
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*
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* Constructs an LTISceneBuffer which is a window into the given existing
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* LTISceneBuffer object. The window of the new buffer is set to cover the
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* full window of the original buffer, starting at the given offset
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* (which is relative to the window of the original buffer).
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*
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* @param original the existing buffer, to be overlaid
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* @param colOffset x-position of the new window
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* @param rowOffset y-position of the new window
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*/
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LTISceneBuffer(const LTISceneBuffer& original,
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lt_uint32 colOffset, |
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lt_uint32 rowOffset); |
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/**
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* constructor to overlay existing LTISceneBuffer
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*
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* Constructs an LTISceneBuffer which is a window into the given existing
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* LTISceneBuffer object. The window of the new buffer is set to start at
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* the given offset (which is relative to the window of the original
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* buffer). The dimensions of the new window are passed in, and the new
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* window must not extend beyond the dimensions of the original buffer.
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*
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* @param original the existing buffer, to be overlaid
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* @param colOffset x-position of the new window
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* @param rowOffset y-position of the new window
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* @param windowNumCols width of the window
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* @param windowNumRows height of the window
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*/
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// exposes only a window of a different bsq buffer; window may not
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// extend outside of parent window; offset is relative to parent
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// window
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LTISceneBuffer(const LTISceneBuffer& original,
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lt_uint32 colOffset, |
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lt_uint32 rowOffset, |
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lt_uint32 windowNumCols, |
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lt_uint32 windowNumRows); |
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/** destructor */
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~LTISceneBuffer(); |
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/*@}*/
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/**
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* @name Buffer property accessors
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*/
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/*@{*/
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/**
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* get width of (entire) buffer
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*
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* Returns the total width of the buffer.
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*
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* @return the total width, in pixels
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*/
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lt_int32 getTotalNumCols() const;
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/**
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* get height of (entire) buffer
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*
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* Returns the total height of the buffer.
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*
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* @return the total height, in pixels
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*/
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lt_int32 getTotalNumRows() const;
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/**
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* get x-position of window
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*
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* Returns the x-position of the exposed window of the buffer.
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*
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* @return the x-position, relative to the whole buffer
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*/
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lt_int32 getWindowColOffset() const;
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/**
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* get y-position of window
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*
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* Returns the y-position of the exposed window of the buffer.
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*
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* @return the y-position, relative to the whole buffer
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*/
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lt_int32 getWindowRowOffset() const;
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/**
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* get width of exposed window
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*
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* Returns the width of the exposed window of the buffer.
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*
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* @return the window width, in pixels
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*/
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lt_int32 getWindowNumCols() const;
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/**
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* get height of exposed window
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*
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* Returns the height of the exposed window of the buffer.
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*
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* @return the window height, in pixels
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*/
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lt_int32 getWindowNumRows() const;
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/**
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* get size of (total) buffer
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*
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* Returns the total size of the buffer, in pixels.
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*
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* This is equal to getTotalNumCols() * getTotalNumRows().
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*
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* @return size of buffer
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*/
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lt_int32 getTotalNumPixels() const;
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/**
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* get size of exposed window
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*
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* Returns the total size of the window of the buffer, in pixels.
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*
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* This is equal to getWindowNumCols() * getWindowNumRows().
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*
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* @return size of window in buffer
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*/
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lt_int32 getWindowNumPixels() const;
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/**
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* get pixel type of buffer
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*
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* Returns the pixel type of the buffer.
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*
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* @return the pixel type
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*/
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const LTIPixel& getPixelProps() const; |
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/**
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* get number of bands
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*
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* Returns the number of bands of the pixel of the imager.
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*
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* This is the same as calling getPixelProps().getNumBands().
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*
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* @return the number of bands
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*/
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lt_uint16 getNumBands() const;
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/*@}*/
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/**
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* @name Data buffer accessors
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*/
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/*@{*/
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/**
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* get pointer to total buffer (for all bands)
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*
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* This function returns a pointer to the array of data buffers, one per
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* band. This returns the "base" pointer for the total region, regardless
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* of the window setting.
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*
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* @return a pointer to the array of data buffers
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*/
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void** getTotalBSQData() const; |
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/**
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* get pointer to total buffer (for 1 band)
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*
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* This function returns a pointer to the data buffer for the given band.
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* This returns the "base" pointer for the total region, regardless of the
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* window setting.
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*
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* @param band the band to access
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* @return a pointer to the data buffer
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*/
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void* getTotalBandData(lt_uint16 band) const; |
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/**
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* get pointer to window data (for all bands)
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*
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* This function returns a pointer to the array of data buffers, one per
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* band. The buffer pointers are set to the start of the window within
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* the total buffer.
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*
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* @return a pointer to the array of data buffers
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*/
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void** getWindowBSQData() const; |
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/**
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* get pointer to window data (for 1 band)
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*
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* This function returns a pointer to the data buffer for the given band.
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* The buffer pointer is set to the start of the window within
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* the total buffer.
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*
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* @param band the band to access
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* @return a pointer to the array of data buffers
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*/
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void* getWindowBandData(lt_uint16 band) const; |
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/**
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* get pointer to sample (total buffer)
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*
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* This function returns a pointer to the data for the given band of the
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* specified pixel. The offset is relative to the total buffer.
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*
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* @param x the x-position of the pixel
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* @param y the y-position of the pixel
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* @param band the band to access
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* @return a pointer to the sample
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*/
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void* getTotalSample(lt_uint32 x, lt_uint32 y, lt_uint16 band) const; |
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/**
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* get pointer to sample (windowed)
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*
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* This function returns a pointer to the data for the given band of the
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* specified pixel. The offset is relative to the window into the buffer.
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*
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* @param x the x-position of the pixel
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* @param y the y-position of the pixel
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* @param band the band to access
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* @return a pointer to the sample
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*/
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void* getWindowSample(lt_uint32 x, lt_uint32 y, lt_uint16 band) const; |
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/*@}*/
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/**
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* query pixel position
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*
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* This function returns true if and only if the given position lies
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* within the exposed window of the buffer. (The position is relative
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* to the total buffer.)
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*
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* @param x the x-position of the pixel
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* @param y the y-position of the pixel
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*/
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bool LTISceneBuffer::inWindow(lt_uint32 x, lt_uint32 y) const; |
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/**
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* @name Import functions
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*
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* These functions provide an easy way to copy data from a variety of
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* layouts into an LTISceneBuffer object, in an efficient manner.
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*
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* The copying is performed relative to the exposed window of the buffer.
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*/
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/*@{*/
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/**
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* import from another LTISceneBuffer, respecting NoData
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*
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* This function copies data from one source LTISceneBuffer object into
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* another destination LTISceneBuffer object. If the \c nodata parameter
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* is set, any pixel in the source that matches the nodata pixel will not
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* be copied to the corresponding destination pixel position.
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*
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* @param sourceData the data to be imported
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* @param nodataPixel source pixel will not be copied if matches; may be NULL
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* @return status code indicating success or failure
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*/
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LT_STATUS importData(const LTISceneBuffer& sourceData,
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const LTIPixel* nodataPixel);
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/**
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* import from another LTISceneBuffer, respecting approximate NoData
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*
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* This function copies data from one source LTISceneBuffer object into
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* another destination LTISceneBuffer object. If the \c nodata parameter
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* is set, any pixel in the source that matches the nodata pixel will not
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* be copied to the corresponding destination pixel position.
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*
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* @param sourceData the data to be imported
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* @param nodataPixel source pixel will not be copied if matches; may be NULL
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* @param mag scene magnification
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* @return status code indicating success or failure
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*/
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LT_STATUS importDataFuzzyNoData(const LTISceneBuffer& sourceData,
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const LTIPixel *nodataPixel,
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double mag);
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/**
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* import from memory (BSQ)
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*
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* This function copies data from a buffer in memory. The source pointer
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* is assumed to be organized as an array of pointers to BSQ buffers, one
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* per band.
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*
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* @param data the source data
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* @return status code indicating success or failure
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*/
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LT_STATUS importDataBSQ(void** data);
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/**
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* import from memory (BSQ)
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*
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* This function copies data from a buffer in memory. The source pointer
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* is assumed to be organized as one large buffer in BSQ format.
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*
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* @param data the source data
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* @return status code indicating success or failure
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*/
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LT_STATUS importDataBSQ(void* data);
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/**
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* import from memory (BIP)
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*
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* This function copies data from a buffer in memory. The source pointer
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* is assumed to be organized as one large buffer in BIP format.
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*
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* @param data the source data
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* @return status code indicating success or failure
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*/
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LT_STATUS importDataBIP(void* data);
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/**
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* import from stream (BSQ)
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*
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* This function copies data from a buffer contained in the given stream.
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* The data is assumed to be organized as one large buffer in BSQ format.
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*
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* @param stream the source data
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* @return status code indicating success or failure
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*/
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LT_STATUS importDataBSQ(LTIOStreamInf& stream); |
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|
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/**
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* import from stream (BIP)
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*
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* This function copies data from a buffer contained in the given stream.
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* The data is assumed to be organized as one large buffer in BIP format.
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*
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* @param stream the source data
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* @return status code indicating success or failure
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*/
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LT_STATUS importDataBIP(LTIOStreamInf& stream); |
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/*@}*/
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/**
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* @name Export functions
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*
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* These functions provide an easy way to copy data from an LTISceneBuffer
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* object to a variety of layouts, in an efficient manner.
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*
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* The copying is performed relative to the exposed window of the buffer.
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*/
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/*@{*/
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/**
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* export to memory (BSQ)
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*
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* This function copies data to a buffer in memory. The destination
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* pointer is assumed to be organized as an array of pointers to BSQ
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* buffers, one per band.
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*
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* If the \c data parameter is NULL, the function will allocate it
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* (but not retain ownership).
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*
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* @param data the destination data (may be NULL) [in/out]
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* @return status code indicating success or failure
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*/
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LT_STATUS exportDataBSQ(void**& data) const; |
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|
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/**
|
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* export to memory (BSQ)
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*
|
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* This function copies data to a buffer in memory. The destination
|
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* pointer is assumed to be organized as one large buffer in BSQ
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* format.
|
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*
|
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* If the \c data parameter is NULL, the function will allocate it
|
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* (but not retain ownership).
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*
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* @param data the destination data (may be NULL) [in/out]
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* @return status code indicating success or failure
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*/
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LT_STATUS exportDataBSQ(void*& data) const; |
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|
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/**
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* export to memory (BIP)
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*
|
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* This function copies data to a buffer in memory. The destination
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* pointer is assumed to be organized as one large buffer in BIP
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* format.
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*
|
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* If the \c data parameter is NULL, the function will allocate it
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* (but not retain ownership).
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*
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* @param data the destination data (may be NULL) [in/out]
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* @return status code indicating success or failure
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*/
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|
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LT_STATUS exportDataBIP(void*& data) const; |
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|
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/**
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* export to stream (BSQ)
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*
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* This function copies data to a stream. The destination is organized as
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* one large buffer in BSQ format.
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*
|
522 |
* @param stream the destination stream
|
523 |
* @return status code indicating success or failure
|
524 |
*/
|
525 |
LT_STATUS exportDataBSQ(LTIOStreamInf& stream) const;
|
526 |
|
527 |
/**
|
528 |
* export to stream (BIP)
|
529 |
*
|
530 |
* This function copies data to a stream. The destination is organized as
|
531 |
* one large buffer in BIP format.
|
532 |
*
|
533 |
* @param stream the destination stream
|
534 |
* @return status code indicating success or failure
|
535 |
*/
|
536 |
LT_STATUS exportDataBIP(LTIOStreamInf& stream) const;
|
537 |
|
538 |
/**
|
539 |
* export to (arbitrary) memory
|
540 |
*
|
541 |
* This function copies data to a buffer. The layout of the destination
|
542 |
* is determined by the input parameters.
|
543 |
*
|
544 |
* For example, assuming RGB/uint8 data and WxH pixels:
|
545 |
*
|
546 |
* \li BIP format: pixelBytes=3, rowBytes=W*3, bandBytes=1
|
547 |
* \li BIL: pixelBytes=1, rowBytes=W*3, bandBytes=W*1
|
548 |
* \li BSQ: pixelBytes=1, rowBytes=W*1, bandBytes=W*H*1
|
549 |
*
|
550 |
* @param data the destination buffer (may not be NULL)
|
551 |
* @param pixelBytes width of pixel, in bytes (e.g. distance from "red" to "red")
|
552 |
* @param rowBytes width of buffer, in bytes
|
553 |
* @param bandBytes distance from sample to the next, in bytes (e.g. distance from "red" to "blue")
|
554 |
* @return status code indicating success or failure
|
555 |
*/
|
556 |
LT_STATUS exportData(void* data,
|
557 |
lt_uint32 pixelBytes, |
558 |
lt_uint32 rowBytes, |
559 |
lt_uint32 bandBytes) const;
|
560 |
/*@}*/
|
561 |
|
562 |
void byteSwap();
|
563 |
|
564 |
/**
|
565 |
* compute alignment constraint
|
566 |
*
|
567 |
* This utility function returns a value which is equal to or greater than
|
568 |
* the given value, when aligned to the given constraint. This is useful
|
569 |
* for determining proper row widths for certain applications.
|
570 |
*
|
571 |
* For example, given the value 99 and an alignment of 4, the function
|
572 |
* will return 100. Given a value of 128 and an alignment of 8, the
|
573 |
* function will return 128.
|
574 |
*
|
575 |
* @param value the nominal buffer width
|
576 |
* @param byteAlignment the alignment required
|
577 |
* @return the aligned width
|
578 |
*/
|
579 |
static lt_uint32 addAlignment(lt_uint32 value, lt_uint32 byteAlignment);
|
580 |
|
581 |
private:
|
582 |
void init(const LTIPixel& pixelProps, |
583 |
lt_uint32 totalWidth, |
584 |
lt_uint32 totalHeight, |
585 |
lt_uint32 xOffset, |
586 |
lt_uint32 yOffset, |
587 |
lt_uint32 windowWidth, |
588 |
lt_uint32 windowHeight, |
589 |
void** data);
|
590 |
|
591 |
void** m_data;
|
592 |
void** m_windowData;
|
593 |
bool m_ownsData;
|
594 |
|
595 |
mutable void** m_tmpBands; // only used by import/export functions |
596 |
|
597 |
lt_int32* m_sampleSizes; // size of each sample, in bytes
|
598 |
|
599 |
LTIPixel* m_pixelProps; |
600 |
lt_uint16 m_numBands; |
601 |
|
602 |
lt_uint32 m_totalNumCols; |
603 |
lt_uint32 m_totalNumRows; |
604 |
lt_uint32 m_windowColOffset; |
605 |
lt_uint32 m_windowRowOffset; |
606 |
lt_uint32 m_windowNumCols; |
607 |
lt_uint32 m_windowNumRows; |
608 |
|
609 |
// nope
|
610 |
LTISceneBuffer(const LTISceneBuffer&);
|
611 |
LTISceneBuffer& operator=(const LTISceneBuffer&);
|
612 |
bool operator==(const LTISceneBuffer&) const; |
613 |
bool operator!=(const LTISceneBuffer&) const; |
614 |
}; |
615 |
|
616 |
|
617 |
LT_END_NAMESPACE(LizardTech) |
618 |
|
619 |
#if defined(LT_COMPILER_MS)
|
620 |
#pragma warning(pop)
|
621 |
#endif
|
622 |
|
623 |
#endif // LTI_SCENEBUFFER_H |