Update to 2.0.0 tree from current Fremantle build

[opencv] / 3rdparty / include / OpenEXR / ImfChromaticities.h

diff --git a/3rdparty/include/OpenEXR/ImfChromaticities.h b/3rdparty/include/OpenEXR/ImfChromaticities.h
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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2003, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// *       Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// *       Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// *       Neither the name of Industrial Light & Magic nor the names of
+// its contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission. 
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+#ifndef INCLUDED_IMF_CHROMATICITIES_H
+#define INCLUDED_IMF_CHROMATICITIES_H
+
+//-----------------------------------------------------------------------------
+//
+//     CIE (x,y) chromaticities, and conversions between
+//     RGB tiples and CIE XYZ tristimulus values.
+//
+//-----------------------------------------------------------------------------
+
+#include "ImathVec.h"
+#include "ImathMatrix.h"
+
+namespace Imf {
+
+   
+struct Chromaticities
+{
+    Imath::V2f red;
+    Imath::V2f green;
+    Imath::V2f blue;
+    Imath::V2f white;
+
+    Chromaticities (const Imath::V2f &red   = Imath::V2f (0.6400f, 0.3300f),
+                   const Imath::V2f &green = Imath::V2f (0.3000f, 0.6000f),
+                   const Imath::V2f &blue  = Imath::V2f (0.1500f, 0.0600f),
+                   const Imath::V2f &white = Imath::V2f (0.3127f, 0.3290f));
+};
+
+
+//
+// Conversions between RGB and CIE XYZ
+//
+// RGB to XYZ:
+//
+//     Given a set of chromaticities, c, and the luminance, Y, of the RGB
+//     triple (1,1,1), or "white", RGBtoXYZ(c,Y) computes a matrix, M, so
+//     that multiplying an RGB value, v, with M produces an equivalent
+//     XYZ value, w.  (w == v * M)
+// 
+//     If we define that
+// 
+//        (Xr, Yr, Zr) == (1, 0, 0) * M
+//        (Xg, Yg, Zg) == (0, 1, 0) * M
+//        (Xb, Yb, Zb) == (0, 0, 1) * M
+//        (Xw, Yw, Zw) == (1, 1, 1) * M,
+// 
+//     then the following statements are true:
+// 
+//        Xr / (Xr + Yr + Zr) == c.red.x
+//        Yr / (Xr + Yr + Zr) == c.red.y
+// 
+//        Xg / (Xg + Yg + Zg) == c.red.x
+//        Yg / (Xg + Yg + Zg) == c.red.y
+// 
+//        Xb / (Xb + Yb + Zb) == c.red.x
+//        Yb / (Xb + Yb + Zb) == c.red.y
+// 
+//        Xw / (Xw + Yw + Zw) == c.red.x
+//        Yw / (Xw + Yw + Zw) == c.red.y
+// 
+//        Yw == Y.
+// 
+// XYZ to RGB:
+// 
+//     YYZtoRGB(c,Y) returns RGBtoXYZ(c,Y).inverse().
+// 
+// Warning:
+// 
+//     It would seem that RGBtoXYZ() and XYZtoRGB() are all you need
+//     to convert RGB values with one set of primary and white point
+//     chromaticities into perceptually equivalent RGB values with
+//     different primary and white point chromaticities:
+// 
+//         M44f M = RGBtoXYZ (chromaticities1, Y1) *
+//                  XYZtoRGB (chromaticities2, Y2);
+// 
+//     However, this simple conversion does not account for white point
+//     adaptation, and produces undesirable results.  The proper thing
+//     to do is to perform a Bradford or a von Kries transform, which
+//     moves the white point of the original color space to the white
+//     point of the destination color space, dragging other colors with
+//     it in a sensible fashion.  
+//
+
+Imath::M44f    RGBtoXYZ (const Chromaticities chroma, float Y);
+Imath::M44f    XYZtoRGB (const Chromaticities chroma, float Y);
+
+
+} // namespace Imf
+
+#endif