summaryrefslogtreecommitdiffstats
path: root/kimgio/exr.cpp
diff options
context:
space:
mode:
authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce4a32fe52ef09d8f5ff1dd22c001110902b60a2 (patch)
tree5ac38a06f3dde268dc7927dc155896926aaf7012 /kimgio/exr.cpp
downloadtdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.tar.gz
tdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'kimgio/exr.cpp')
-rw-r--r--kimgio/exr.cpp167
1 files changed, 167 insertions, 0 deletions
diff --git a/kimgio/exr.cpp b/kimgio/exr.cpp
new file mode 100644
index 000000000..e3efe5a6a
--- /dev/null
+++ b/kimgio/exr.cpp
@@ -0,0 +1,167 @@
+// -*- C++;indent-tabs-mode: t; tab-width: 4; c-basic-offset: 4; -*-
+
+/**
+* KImageIO Routines to read (and perhaps in the future, write) images
+* in the high dynamic range EXR format.
+* Copyright (c) 2003, Brad Hards <bradh@frogmouth.net>
+*
+* This library is distributed under the conditions of the GNU LGPL.
+*
+* $Id$
+*/
+
+#include "config.h"
+
+#ifdef HAVE_EXR
+
+#include <ImfRgbaFile.h>
+#include <ImfStandardAttributes.h>
+#include <ImathBox.h>
+#include <ImfInputFile.h>
+#include <ImfBoxAttribute.h>
+#include <ImfChannelListAttribute.h>
+#include <ImfCompressionAttribute.h>
+#include <ImfFloatAttribute.h>
+#include <ImfIntAttribute.h>
+#include <ImfLineOrderAttribute.h>
+#include <ImfStringAttribute.h>
+#include <ImfVecAttribute.h>
+#include <ImfArray.h>
+#include <ImfConvert.h>
+
+#include <iostream>
+
+#include <stdlib.h>
+
+#include <kurl.h>
+#include <kprocess.h>
+#include <klocale.h>
+#include <kgenericfactory.h>
+#include <kdebug.h>
+
+#include <qimage.h>
+#include <qcstring.h>
+#include <qfile.h>
+#include <qdatetime.h>
+#include <qdict.h>
+#include <qvalidator.h>
+#include <qcolor.h>
+
+#include "exr.h"
+
+using namespace Imf;
+
+/* this does a conversion from the ILM Half (equal to Nvidia Half)
+ * format into the normal 32 bit pixel format. Process is from the
+ * ILM code.
+ */
+QRgb RgbaToQrgba(struct Rgba imagePixel)
+{
+ float r,g,b,a;
+
+ // 1) Compensate for fogging by subtracting defog
+ // from the raw pixel values.
+ // Response: We work with defog of 0.0, so this is a no-op
+
+ // 2) Multiply the defogged pixel values by
+ // 2^(exposure + 2.47393).
+ // Response: We work with exposure of 0.0.
+ // (2^2.47393) is 5.55555
+ r = imagePixel.r * 5.55555;
+ g = imagePixel.g * 5.55555;
+ b = imagePixel.b * 5.55555;
+ a = imagePixel.a * 5.55555;
+
+ // 3) Values, which are now 1.0, are called "middle gray".
+ // If defog and exposure are both set to 0.0, then
+ // middle gray corresponds to a raw pixel value of 0.18.
+ // In step 6, middle gray values will be mapped to an
+ // intensity 3.5 f-stops below the display's maximum
+ // intensity.
+ // Response: no apparent content.
+
+ // 4) Apply a knee function. The knee function has two
+ // parameters, kneeLow and kneeHigh. Pixel values
+ // below 2^kneeLow are not changed by the knee
+ // function. Pixel values above kneeLow are lowered
+ // according to a logarithmic curve, such that the
+ // value 2^kneeHigh is mapped to 2^3.5 (in step 6,
+ // this value will be mapped to the the display's
+ // maximum intensity).
+ // Response: kneeLow = 0.0 (2^0.0 => 1); kneeHigh = 5.0 (2^5 =>32)
+ if (r > 1.0)
+ r = 1.0 + Imath::Math<float>::log ((r-1.0) * 0.184874 + 1) / 0.184874;
+ if (g > 1.0)
+ g = 1.0 + Imath::Math<float>::log ((g-1.0) * 0.184874 + 1) / 0.184874;
+ if (b > 1.0)
+ b = 1.0 + Imath::Math<float>::log ((b-1.0) * 0.184874 + 1) / 0.184874;
+ if (a > 1.0)
+ a = 1.0 + Imath::Math<float>::log ((a-1.0) * 0.184874 + 1) / 0.184874;
+//
+// 5) Gamma-correct the pixel values, assuming that the
+// screen's gamma is 0.4545 (or 1/2.2).
+ r = Imath::Math<float>::pow (r, 0.4545);
+ g = Imath::Math<float>::pow (g, 0.4545);
+ b = Imath::Math<float>::pow (b, 0.4545);
+ a = Imath::Math<float>::pow (a, 0.4545);
+
+// 6) Scale the values such that pixels middle gray
+// pixels are mapped to 84.66 (or 3.5 f-stops below
+// the display's maximum intensity).
+//
+// 7) Clamp the values to [0, 255].
+ return qRgba( char (Imath::clamp ( r * 84.66f, 0.f, 255.f ) ),
+ char (Imath::clamp ( g * 84.66f, 0.f, 255.f ) ),
+ char (Imath::clamp ( b * 84.66f, 0.f, 255.f ) ),
+ char (Imath::clamp ( a * 84.66f, 0.f, 255.f ) ) );
+}
+
+KDE_EXPORT void kimgio_exr_read( QImageIO *io )
+{
+ try
+ {
+ int width, height;
+
+ // This won't work if io is not QFile !
+ RgbaInputFile file (QFile::encodeName(io->fileName()));
+ Imath::Box2i dw = file.dataWindow();
+
+ width = dw.max.x - dw.min.x + 1;
+ height = dw.max.y - dw.min.y + 1;
+
+ Array2D<Rgba> pixels;
+ pixels.resizeErase (height, width);
+
+ file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * width, 1, width);
+ file.readPixels (dw.min.y, dw.max.y);
+
+ QImage image(width, height, 32, 0, QImage::BigEndian);
+ if( image.isNull())
+ return;
+
+ // somehow copy pixels into image
+ for ( int y=0; y < height; y++ ) {
+ for ( int x=0; x < width; x++ ) {
+ // copy pixels(x,y) into image(x,y)
+ image.setPixel( x, y, RgbaToQrgba( pixels[y][x] ) );
+ }
+ }
+
+ io->setImage( image );
+ io->setStatus( 0 );
+ }
+ catch (const std::exception &exc)
+ {
+ kdDebug(399) << exc.what() << endl;
+ return;
+ }
+}
+
+
+KDE_EXPORT void kimgio_exr_write(QImageIO *)
+{
+ // TODO: stub
+}
+
+
+#endif