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195 lines
3.7 KiB
195 lines
3.7 KiB
/*****************************************************************************/ |
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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.cpp#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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/*****************************************************************************/ |
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#include "dng_1d_table.h" |
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#include "dng_1d_function.h" |
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#include "dng_memory.h" |
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#include "dng_utils.h" |
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/*****************************************************************************/ |
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dng_1d_table::dng_1d_table () |
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: fBuffer () |
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, fTable (NULL) |
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{ |
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} |
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/*****************************************************************************/ |
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dng_1d_table::~dng_1d_table () |
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{ |
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} |
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/*****************************************************************************/ |
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void dng_1d_table::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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{ |
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uint32 range = upper - lower; |
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bool subDivide = (range > (kTableSize >> 8)); |
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if (!subDivide) |
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{ |
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real32 delta = Abs_real32 (fTable [upper] - |
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fTable [lower]); |
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if (delta > maxDelta) |
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{ |
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subDivide = true; |
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} |
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} |
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if (subDivide) |
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{ |
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uint32 middle = (lower + upper) >> 1; |
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fTable [middle] = (real32) function.Evaluate (middle * (1.0 / (real64) kTableSize)); |
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if (range > 2) |
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{ |
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SubDivide (function, lower, middle, maxDelta); |
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SubDivide (function, middle, upper, maxDelta); |
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} |
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} |
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else |
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{ |
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real64 y0 = fTable [lower]; |
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real64 y1 = fTable [upper]; |
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real64 delta = (y1 - y0) / (real64) range; |
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for (uint32 j = lower + 1; j < upper; j++) |
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{ |
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y0 += delta; |
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fTable [j] = (real32) y0; |
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} |
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} |
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} |
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/*****************************************************************************/ |
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void dng_1d_table::Initialize (dng_memory_allocator &allocator, |
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const dng_1d_function &function, |
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bool subSample) |
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{ |
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fBuffer.Reset (allocator.Allocate ((kTableSize + 2) * sizeof (real32))); |
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fTable = fBuffer->Buffer_real32 (); |
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if (subSample) |
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{ |
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fTable [0 ] = (real32) function.Evaluate (0.0); |
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fTable [kTableSize] = (real32) function.Evaluate (1.0); |
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real32 maxDelta = Max_real32 (Abs_real32 (fTable [kTableSize] - |
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fTable [0 ]), 1.0f) * |
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(1.0f / 256.0f); |
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SubDivide (function, |
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0, |
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kTableSize, |
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maxDelta); |
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} |
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else |
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{ |
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for (uint32 j = 0; j <= kTableSize; j++) |
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{ |
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real64 x = j * (1.0 / (real64) kTableSize); |
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real64 y = function.Evaluate (x); |
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fTable [j] = (real32) y; |
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} |
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} |
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fTable [kTableSize + 1] = fTable [kTableSize]; |
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} |
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/*****************************************************************************/ |
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void dng_1d_table::Expand16 (uint16 *table16) const |
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{ |
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real64 step = (real64) kTableSize / 65535.0; |
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real64 y0 = fTable [0]; |
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real64 y1 = fTable [1]; |
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real64 base = y0 * 65535.0 + 0.5; |
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real64 slope = (y1 - y0) * 65535.0; |
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uint32 index = 1; |
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real64 fract = 0.0; |
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for (uint32 j = 0; j < 0x10000; j++) |
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{ |
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table16 [j] = (uint16) (base + slope * fract); |
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fract += step; |
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if (fract > 1.0) |
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{ |
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index += 1; |
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fract -= 1.0; |
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y0 = y1; |
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y1 = fTable [index]; |
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base = y0 * 65535.0 + 0.5; |
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slope = (y1 - y0) * 65535.0; |
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} |
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} |
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} |
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/*****************************************************************************/
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