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

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