rgb2luv.cpp

Namespaces:

namespace
Detailed Description

 1
 2//-----------------------------------------------------------------------------
 3// Copyright (c) 2012 GarageGames, LLC
 4//
 5// Permission is hereby granted, free of charge, to any person obtaining a copy
 6// of this software and associated documentation files (the "Software"), to
 7// deal in the Software without restriction, including without limitation the
 8// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 9// sell copies of the Software, and to permit persons to whom the Software is
10// furnished to do so, subject to the following conditions:
11//
12// The above copyright notice and this permission notice shall be included in
13// all copies or substantial portions of the Software.
14//
15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21// IN THE SOFTWARE.
22//-----------------------------------------------------------------------------
23
24#include "platform/platform.h"
25#include "core/util/rgb2luv.h"
26
27#include "core/util/rgb2xyz.h"
28#include "math/mPoint3.h"
29#include "math/mPoint2.h"
30
31
32namespace ConvertRGB
33{
34
35LinearColorF toLUV( const LinearColorF &rgbColor )
36{
37   static const Point3F scXYZLUVDot( 1.0f, 15.0f, 3.0f );
38   static const Point2F sc49( 4.0f, 9.0f );
39
40   LinearColorF xyzColor = ConvertRGB::toXYZ( rgbColor );
41
42   const Point2F &xyz_xy = *((Point2F *)&xyzColor);
43
44   Point2F uvColor = sc49;
45   uvColor.convolve( xyz_xy );
46   uvColor /= mDot( *(Point3F *)&xyzColor, scXYZLUVDot );
47
48   return LinearColorF( uvColor.x, uvColor.y, xyzColor.green, rgbColor.alpha );
49}
50
51LinearColorF toLUVScaled( const LinearColorF &rgbColor )
52{
53   LinearColorF luvColor = toLUV( rgbColor );
54   luvColor.red /= 0.62f;
55   luvColor.green /= 0.62f;
56   return luvColor;
57}
58
59}
60