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168 lines
4.6 KiB
168 lines
4.6 KiB
// -*- C++;indent-tabs-mode: t; tab-width: 4; c-basic-offset: 4; -*-
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/**
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* KImageIO Routines to read (and perhaps in the future, write) images
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* in the high dynamic range EXR format.
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* Copyright (c) 2003, Brad Hards <bradh@frogmouth.net>
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*
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* This library is distributed under the conditions of the GNU LGPL.
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*
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* $Id$
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*/
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#include "config.h"
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#ifdef HAVE_EXR
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#include <ImfRgbaFile.h>
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#include <ImfStandardAttributes.h>
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#include <ImathBox.h>
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#include <ImfInputFile.h>
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#include <ImfBoxAttribute.h>
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#include <ImfChannelListAttribute.h>
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#include <ImfCompressionAttribute.h>
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#include <ImfFloatAttribute.h>
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#include <ImfIntAttribute.h>
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#include <ImfLineOrderAttribute.h>
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#include <ImfStringAttribute.h>
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#include <ImfVecAttribute.h>
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#include <ImfArray.h>
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#include <ImfConvert.h>
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#include <iostream>
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#include <stdlib.h>
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#include <kurl.h>
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#include <kprocess.h>
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#include <klocale.h>
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#include <kgenericfactory.h>
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#include <kdebug.h>
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#include <tqimage.h>
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#include <tqcstring.h>
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#include <tqfile.h>
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#include <tqdatetime.h>
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#include <tqdict.h>
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#include <tqvalidator.h>
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#include <tqcolor.h>
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#include "exr.h"
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using namespace Imf;
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/* this does a conversion from the ILM Half (equal to Nvidia Half)
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* format into the normal 32 bit pixel format. Process is from the
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* ILM code.
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*/
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QRgb RgbaToQrgba(struct Rgba imagePixel)
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{
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float r,g,b,a;
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// 1) Compensate for fogging by subtracting defog
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// from the raw pixel values.
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// Response: We work with defog of 0.0, so this is a no-op
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// 2) Multiply the defogged pixel values by
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// 2^(exposure + 2.47393).
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// Response: We work with exposure of 0.0.
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// (2^2.47393) is 5.55555
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r = imagePixel.r * 5.55555;
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g = imagePixel.g * 5.55555;
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b = imagePixel.b * 5.55555;
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a = imagePixel.a * 5.55555;
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// 3) Values, which are now 1.0, are called "middle gray".
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// If defog and exposure are both set to 0.0, then
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// middle gray corresponds to a raw pixel value of 0.18.
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// In step 6, middle gray values will be mapped to an
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// intensity 3.5 f-stops below the display's maximum
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// intensity.
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// Response: no apparent content.
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// 4) Apply a knee function. The knee function has two
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// parameters, kneeLow and kneeHigh. Pixel values
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// below 2^kneeLow are not changed by the knee
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// function. Pixel values above kneeLow are lowered
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// according to a logarithmic curve, such that the
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// value 2^kneeHigh is mapped to 2^3.5 (in step 6,
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// this value will be mapped to the the display's
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// maximum intensity).
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// Response: kneeLow = 0.0 (2^0.0 => 1); kneeHigh = 5.0 (2^5 =>32)
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if (r > 1.0)
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r = 1.0 + Imath::Math<float>::log ((r-1.0) * 0.184874 + 1) / 0.184874;
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if (g > 1.0)
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g = 1.0 + Imath::Math<float>::log ((g-1.0) * 0.184874 + 1) / 0.184874;
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if (b > 1.0)
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b = 1.0 + Imath::Math<float>::log ((b-1.0) * 0.184874 + 1) / 0.184874;
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if (a > 1.0)
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a = 1.0 + Imath::Math<float>::log ((a-1.0) * 0.184874 + 1) / 0.184874;
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//
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// 5) Gamma-correct the pixel values, assuming that the
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// screen's gamma is 0.4545 (or 1/2.2).
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r = Imath::Math<float>::pow (r, 0.4545);
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g = Imath::Math<float>::pow (g, 0.4545);
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b = Imath::Math<float>::pow (b, 0.4545);
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a = Imath::Math<float>::pow (a, 0.4545);
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// 6) Scale the values such that pixels middle gray
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// pixels are mapped to 84.66 (or 3.5 f-stops below
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// the display's maximum intensity).
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//
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// 7) Clamp the values to [0, 255].
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return tqRgba( char (Imath::clamp ( r * 84.66f, 0.f, 255.f ) ),
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char (Imath::clamp ( g * 84.66f, 0.f, 255.f ) ),
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char (Imath::clamp ( b * 84.66f, 0.f, 255.f ) ),
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char (Imath::clamp ( a * 84.66f, 0.f, 255.f ) ) );
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}
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KDE_EXPORT void kimgio_exr_read( TQImageIO *io )
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{
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try
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{
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int width, height;
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// This won't work if io is not TQFile !
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RgbaInputFile file (TQFile::encodeName(io->fileName()));
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Imath::Box2i dw = file.dataWindow();
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width = dw.max.x - dw.min.x + 1;
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height = dw.max.y - dw.min.y + 1;
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Array2D<Rgba> pixels;
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pixels.resizeErase (height, width);
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file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * width, 1, width);
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file.readPixels (dw.min.y, dw.max.y);
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TQImage image(width, height, 32, 0, TQImage::BigEndian);
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if( image.isNull())
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return;
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// somehow copy pixels into image
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for ( int y=0; y < height; y++ ) {
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for ( int x=0; x < width; x++ ) {
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// copy pixels(x,y) into image(x,y)
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image.setPixel( x, y, RgbaToQrgba( pixels[y][x] ) );
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}
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}
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io->setImage( image );
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io->seStatus( 0 );
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}
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catch (const std::exception &exc)
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{
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kdDebug(399) << exc.what() << endl;
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return;
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}
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}
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KDE_EXPORT void kimgio_exr_write(TQImageIO *)
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{
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// TODO: stub
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}
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#endif
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