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livecode/engine/src/color.cpp at develop · livecodeali/livecode · GitHub
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/*
Copyright (C) 2003-2015 LiveCode Ltd.
This file is part of LiveCode.
LiveCode is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License v3 as published by the Free
Software Foundation.
LiveCode is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LiveCode. If not see <http://www.gnu.org/licenses/>.
*/
//
IM-2014-09-24: [[ Bug 13208 ]] Shared code to convert from Linear RGB color space to CIE 1931 XYZ
#
include
"
prefix.h
"
#
include
"
graphics.h
"
#
include
"
color.h
"
//
//////////////////////////////////////////////////////////////////////////////
MCColorVector3
MCColorVector3ScalarMultiply
(
const
MCColorVector3 &p_vector, MCGFloat p_scalar)
{
return
MCColorVector3Make
(p_vector.
x
* p_scalar, p_vector.
y
* p_scalar, p_vector.
z
* p_scalar);
}
void
MCColorMatrix3x3Set
(MCColorMatrix3x3 &x_matrix,
MCGFloat a, MCGFloat b, MCGFloat c,
MCGFloat d, MCGFloat e, MCGFloat f,
MCGFloat g, MCGFloat h, MCGFloat i)
{
x_matrix.
m
[
0
][
0
] = a;
x_matrix.
m
[
1
][
0
] = b;
x_matrix.
m
[
2
][
0
] = c;
x_matrix.
m
[
0
][
1
] = d;
x_matrix.
m
[
1
][
1
] = e;
x_matrix.
m
[
2
][
1
] = f;
x_matrix.
m
[
0
][
2
] = g;
x_matrix.
m
[
1
][
2
] = h;
x_matrix.
m
[
2
][
2
] = i;
}
void
MCColorMatrix3x3Copy
(
const
MCColorMatrix3x3 &p_matrix, MCColorMatrix3x3 &r_copy)
{
MCMemoryCopy
(&r_copy, &p_matrix,
sizeof
(MCColorMatrix3x3));
}
bool
MCColorMatrix3x3Inverse
(
const
MCColorMatrix3x3 &p_matrix, MCColorMatrix3x3 &r_inverse)
{
MCGFloat a, b, c;
a = p_matrix.
m
[
1
][
1
] * p_matrix.
m
[
2
][
2
] - p_matrix.
m
[
1
][
2
] * p_matrix.
m
[
2
][
1
];
b = p_matrix.
m
[
1
][
2
] * p_matrix.
m
[
2
][
0
] - p_matrix.
m
[
1
][
0
] * p_matrix.
m
[
2
][
2
];
c = p_matrix.
m
[
1
][
0
] * p_matrix.
m
[
2
][
1
] - p_matrix.
m
[
1
][
1
] * p_matrix.
m
[
2
][
0
];
MCGFloat t_det;
t_det = p_matrix.
m
[
0
][
0
] * a + p_matrix.
m
[
0
][
1
] * b + p_matrix.
m
[
0
][
2
] * c;
if
(t_det ==
0.0
)
return
false
;
MCGFloat t_inv_det;
t_inv_det =
1.0
/ t_det;
r_inverse.
m
[
0
][
0
] = t_inv_det * a;
r_inverse.
m
[
0
][
1
] = t_inv_det * (p_matrix.
m
[
2
][
1
] * p_matrix.
m
[
0
][
2
] - p_matrix.
m
[
2
][
2
] * p_matrix.
m
[
0
][
1
]);
r_inverse.
m
[
0
][
2
] = t_inv_det * (p_matrix.
m
[
0
][
1
] * p_matrix.
m
[
1
][
2
] - p_matrix.
m
[
0
][
2
] * p_matrix.
m
[
1
][
1
]);
r_inverse.
m
[
1
][
0
] = t_inv_det * b;
r_inverse.
m
[
1
][
1
] = t_inv_det * (p_matrix.
m
[
2
][
2
] * p_matrix.
m
[
0
][
0
] - p_matrix.
m
[
2
][
0
] * p_matrix.
m
[
0
][
2
]);
r_inverse.
m
[
1
][
2
] = t_inv_det * (p_matrix.
m
[
0
][
2
] * p_matrix.
m
[
1
][
0
] - p_matrix.
m
[
0
][
0
] * p_matrix.
m
[
1
][
2
]);
r_inverse.
m
[
2
][
0
] = t_inv_det * c;
r_inverse.
m
[
2
][
1
] = t_inv_det * (p_matrix.
m
[
2
][
0
] * p_matrix.
m
[
0
][
1
] - p_matrix.
m
[
2
][
1
] * p_matrix.
m
[
0
][
0
]);
r_inverse.
m
[
2
][
2
] = t_inv_det * (p_matrix.
m
[
0
][
0
] * p_matrix.
m
[
1
][
1
] - p_matrix.
m
[
0
][
1
] * p_matrix.
m
[
1
][
0
]);
return
true
;
}
MCColorVector3
MCColorMatrix3x3MultiplyVector
(
const
MCColorMatrix3x3 &p_matrix,
const
MCColorVector3 &p_vector)
{
return
MCColorVector3Make
(p_matrix.
m
[
0
][
0
] * p_vector.
x
+ p_matrix.
m
[
0
][
1
] * p_vector.
y
+ p_matrix.
m
[
0
][
2
] * p_vector.
z
,
p_matrix.
m
[
1
][
0
] * p_vector.
x
+ p_matrix.
m
[
1
][
1
] * p_vector.
y
+ p_matrix.
m
[
1
][
2
] * p_vector.
z
,
p_matrix.
m
[
2
][
0
] * p_vector.
x
+ p_matrix.
m
[
2
][
1
] * p_vector.
y
+ p_matrix.
m
[
2
][
2
] * p_vector.
z
);
}
MCColorVector3
xy_to_xyz
(
const
MCColorVector2 &p_xy)
{
return
MCColorVector3Make
(p_xy.
x
, p_xy.
y
,
1.0
- (p_xy.
x
+ p_xy.
y
));
}
bool
MCColorTransformLinearRGBToXYZ
(
const
MCColorVector2 &p_white,
const
MCColorVector2 &p_red,
const
MCColorVector2 &p_green,
const
MCColorVector2 &p_blue,
MCColorVector3 &r_white, MCColorMatrix3x3 &r_matrix)
{
MCColorVector3 t_r, t_g, t_b, t_w;
t_r =
xy_to_xyz
(p_red);
t_g =
xy_to_xyz
(p_green);
t_b =
xy_to_xyz
(p_blue);
t_w =
xy_to_xyz
(p_white);
t_w =
MCColorVector3ScalarMultiply
(t_w,
1.0
/ t_w.
y
);
MCColorMatrix3x3 t_matrix;
MCColorMatrix3x3Set
(t_matrix,
t_r.
x
, t_r.
y
, t_r.
z
,
t_g.
x
, t_g.
y
, t_g.
z
,
t_b.
x
, t_b.
y
, t_b.
z
);
MCColorMatrix3x3 t_inverse;
if
(!
MCColorMatrix3x3Inverse
(t_matrix, t_inverse))
return
false
;
MCColorVector3 t_scale;
t_scale =
MCColorMatrix3x3MultiplyVector
(t_inverse, t_w);
t_matrix.
m
[
0
][
0
] *= t_scale.
x
;
t_matrix.
m
[
1
][
0
] *= t_scale.
x
;
t_matrix.
m
[
2
][
0
] *= t_scale.
x
;
t_matrix.
m
[
0
][
1
] *= t_scale.
y
;
t_matrix.
m
[
1
][
1
] *= t_scale.
y
;
t_matrix.
m
[
2
][
1
] *= t_scale.
y
;
t_matrix.
m
[
0
][
2
] *= t_scale.
z
;
t_matrix.
m
[
1
][
2
] *= t_scale.
z
;
t_matrix.
m
[
2
][
2
] *= t_scale.
z
;
//
MCColorMatrix3x3Copy(t_matrix, r_matrix);
r_matrix = t_matrix;
r_white = t_w;
return
true
;
}
//
//////////////////////////////////////////////////////////////////////////////
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