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130 lines
3.4 KiB
130 lines
3.4 KiB
4 months ago
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/*****************************************************************************/
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// Copyright 2006-2008 Adobe Systems Incorporated
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// All Rights Reserved.
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//
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// NOTICE: Adobe permits you to use, modify, and distribute this file in
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// accordance with the terms of the Adobe license agreement accompanying it.
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/*****************************************************************************/
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/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_1d_table.h#1 $ */
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/* $DateTime: 2012/05/30 13:28:51 $ */
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/* $Change: 832332 $ */
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/* $Author: tknoll $ */
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/** \file
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* Definition of a lookup table based 1D floating-point to floating-point function abstraction using linear interpolation.
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*/
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/*****************************************************************************/
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#ifndef __dng_1d_table__
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#define __dng_1d_table__
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/*****************************************************************************/
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#include "dng_assertions.h"
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#include "dng_auto_ptr.h"
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#include "dng_classes.h"
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#include "dng_types.h"
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/*****************************************************************************/
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/// \brief A 1D floating-point lookup table using linear interpolation.
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class dng_1d_table
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{
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public:
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/// Constants denoting size of table.
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enum
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{
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kTableBits = 12, //< Table is always a power of 2 in size. This is log2(kTableSize).
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kTableSize = (1 << kTableBits) //< Number of entries in table.
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};
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protected:
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AutoPtr<dng_memory_block> fBuffer;
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real32 *fTable;
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public:
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dng_1d_table ();
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virtual ~dng_1d_table ();
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/// Set up table, initialize entries using functiion.
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/// This method can throw an exception, e.g. if there is not enough memory.
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/// \param allocator Memory allocator from which table memory is allocated.
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/// \param function Table is initialized with values of finction.Evalluate(0.0) to function.Evaluate(1.0).
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/// \param subSample If true, only sample the function a limited number of times and interpolate.
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void Initialize (dng_memory_allocator &allocator,
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const dng_1d_function &function,
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bool subSample = false);
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/// Lookup and interpolate mapping for an input.
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/// \param x value from 0.0 to 1.0 used as input for mapping
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/// \retval Approximation of function.Evaluate(x)
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real32 Interpolate (real32 x) const
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{
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real32 y = x * (real32) kTableSize;
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int32 index = (int32) y;
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if (index < 0 || index > kTableSize)
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{
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ThrowBadFormat("Index out of range.");
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}
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DNG_ASSERT (index >= 0 && index <= kTableSize,
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"dng_1d_table::Interpolate parameter out of range");
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real32 z = (real32) index;
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real32 fract = y - z;
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return fTable [index ] * (1.0f - fract) +
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fTable [index + 1] * ( fract);
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}
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/// Direct access function for table data.
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const real32 * Table () const
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{
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return fTable;
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}
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/// Expand the table to a 16-bit to 16-bit table.
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void Expand16 (uint16 *table16) const;
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private:
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void SubDivide (const dng_1d_function &function,
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uint32 lower,
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uint32 upper,
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real32 maxDelta);
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// Hidden copy constructor and assignment operator.
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dng_1d_table (const dng_1d_table &table);
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dng_1d_table & operator= (const dng_1d_table &table);
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};
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/*****************************************************************************/
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#endif
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/*****************************************************************************/
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