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/*****************************************************************************/
// Copyright 2006-2008 Adobe Systems Incorporated
// All Rights Reserved.
//
// NOTICE: Adobe permits you to use, modify, and distribute this file in
// accordance with the terms of the Adobe license agreement accompanying it.
/*****************************************************************************/
/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_1d_table.cpp#1 $ */
/* $DateTime: 2012/05/30 13:28:51 $ */
/* $Change: 832332 $ */
/* $Author: tknoll $ */
/*****************************************************************************/
#include "dng_1d_table.h"
#include "dng_1d_function.h"
#include "dng_memory.h"
#include "dng_utils.h"
/*****************************************************************************/
dng_1d_table::dng_1d_table ()
: fBuffer ()
, fTable (NULL)
{
}
/*****************************************************************************/
dng_1d_table::~dng_1d_table ()
{
}
/*****************************************************************************/
void dng_1d_table::SubDivide (const dng_1d_function &function,
uint32 lower,
uint32 upper,
real32 maxDelta)
{
uint32 range = upper - lower;
bool subDivide = (range > (kTableSize >> 8));
if (!subDivide)
{
real32 delta = Abs_real32 (fTable [upper] -
fTable [lower]);
if (delta > maxDelta)
{
subDivide = true;
}
}
if (subDivide)
{
uint32 middle = (lower + upper) >> 1;
fTable [middle] = (real32) function.Evaluate (middle * (1.0 / (real64) kTableSize));
if (range > 2)
{
SubDivide (function, lower, middle, maxDelta);
SubDivide (function, middle, upper, maxDelta);
}
}
else
{
real64 y0 = fTable [lower];
real64 y1 = fTable [upper];
real64 delta = (y1 - y0) / (real64) range;
for (uint32 j = lower + 1; j < upper; j++)
{
y0 += delta;
fTable [j] = (real32) y0;
}
}
}
/*****************************************************************************/
void dng_1d_table::Initialize (dng_memory_allocator &allocator,
const dng_1d_function &function,
bool subSample)
{
fBuffer.Reset (allocator.Allocate ((kTableSize + 2) * sizeof (real32)));
fTable = fBuffer->Buffer_real32 ();
if (subSample)
{
fTable [0 ] = (real32) function.Evaluate (0.0);
fTable [kTableSize] = (real32) function.Evaluate (1.0);
real32 maxDelta = Max_real32 (Abs_real32 (fTable [kTableSize] -
fTable [0 ]), 1.0f) *
(1.0f / 256.0f);
SubDivide (function,
0,
kTableSize,
maxDelta);
}
else
{
for (uint32 j = 0; j <= kTableSize; j++)
{
real64 x = j * (1.0 / (real64) kTableSize);
real64 y = function.Evaluate (x);
fTable [j] = (real32) y;
}
}
fTable [kTableSize + 1] = fTable [kTableSize];
}
/*****************************************************************************/
void dng_1d_table::Expand16 (uint16 *table16) const
{
real64 step = (real64) kTableSize / 65535.0;
real64 y0 = fTable [0];
real64 y1 = fTable [1];
real64 base = y0 * 65535.0 + 0.5;
real64 slope = (y1 - y0) * 65535.0;
uint32 index = 1;
real64 fract = 0.0;
for (uint32 j = 0; j < 0x10000; j++)
{
table16 [j] = (uint16) (base + slope * fract);
fract += step;
if (fract > 1.0)
{
index += 1;
fract -= 1.0;
y0 = y1;
y1 = fTable [index];
base = y0 * 65535.0 + 0.5;
slope = (y1 - y0) * 65535.0;
}
}
}
/*****************************************************************************/
|
