1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/*
Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "rgb_xyz.h"
#include "argb_frame.h"
#include "xyz_frame.h"
#include "gamma_lut.h"
#include "image.h"
#include "colour_matrix.h"
#include <cmath>
using std::min;
using std::max;
using boost::shared_ptr;
using namespace dcp;
#define DCI_COEFFICIENT (48.0 / 52.37)
/** Convert an openjpeg XYZ image to RGBA.
* @param xyz_frame Frame in XYZ.
* @param lut_in Input Gamma LUT to use.
* @param lut_out Output Gamma LUT to use.
* @return RGB image.
*/
shared_ptr<ARGBFrame>
dcp::xyz_to_rgba (
boost::shared_ptr<const XYZFrame> xyz_frame,
boost::shared_ptr<const GammaLUT> lut_in,
boost::shared_ptr<const GammaLUT> lut_out
)
{
int const max_colour = pow (2, lut_out->bit_depth()) - 1;
struct {
double x, y, z;
} s;
struct {
double r, g, b;
} d;
int* xyz_x = xyz_frame->data (0);
int* xyz_y = xyz_frame->data (1);
int* xyz_z = xyz_frame->data (2);
shared_ptr<ARGBFrame> argb_frame (new ARGBFrame (xyz_frame->size ()));
uint8_t* argb = argb_frame->data ();
for (int y = 0; y < xyz_frame->size().height; ++y) {
uint8_t* argb_line = argb;
for (int x = 0; x < xyz_frame->size().width; ++x) {
assert (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_y < 4096 && *xyz_z < 4096);
/* In gamma LUT */
s.x = lut_in->lut()[*xyz_x++];
s.y = lut_in->lut()[*xyz_y++];
s.z = lut_in->lut()[*xyz_z++];
/* DCI companding */
s.x /= DCI_COEFFICIENT;
s.y /= DCI_COEFFICIENT;
s.z /= DCI_COEFFICIENT;
/* XYZ to RGB */
d.r = ((s.x * colour_matrix::xyz_to_rgb[0][0]) + (s.y * colour_matrix::xyz_to_rgb[0][1]) + (s.z * colour_matrix::xyz_to_rgb[0][2]));
d.g = ((s.x * colour_matrix::xyz_to_rgb[1][0]) + (s.y * colour_matrix::xyz_to_rgb[1][1]) + (s.z * colour_matrix::xyz_to_rgb[1][2]));
d.b = ((s.x * colour_matrix::xyz_to_rgb[2][0]) + (s.y * colour_matrix::xyz_to_rgb[2][1]) + (s.z * colour_matrix::xyz_to_rgb[2][2]));
d.r = min (d.r, 1.0);
d.r = max (d.r, 0.0);
d.g = min (d.g, 1.0);
d.g = max (d.g, 0.0);
d.b = min (d.b, 1.0);
d.b = max (d.b, 0.0);
/* Out gamma LUT */
*argb_line++ = lut_out->lut()[(int) (d.b * max_colour)] * 0xff;
*argb_line++ = lut_out->lut()[(int) (d.g * max_colour)] * 0xff;
*argb_line++ = lut_out->lut()[(int) (d.r * max_colour)] * 0xff;
*argb_line++ = 0xff;
}
argb += argb_frame->stride ();
}
return argb_frame;
}
/** Convert an openjpeg XYZ image to RGB.
* @param xyz_frame Frame in XYZ.
* @param lut_in Input Gamma LUT to use.
* @param lut_out Output Gamma LUT to use.
* @param buffer Buffer to write RGB data to; will be written
* as one byte R, one byte G, one byte B, one byte R etc. with
* no padding at line ends.
*/
void
dcp::xyz_to_rgb (
boost::shared_ptr<const XYZFrame> xyz_frame,
boost::shared_ptr<const GammaLUT> lut_in,
boost::shared_ptr<const GammaLUT> lut_out,
uint8_t* buffer
)
{
int const max_colour = pow (2, lut_out->bit_depth()) - 1;
struct {
double x, y, z;
} s;
struct {
double r, g, b;
} d;
int* xyz_x = xyz_frame->data (0);
int* xyz_y = xyz_frame->data (1);
int* xyz_z = xyz_frame->data (2);
for (int y = 0; y < xyz_frame->size().height; ++y) {
uint8_t* buffer_line = buffer;
for (int x = 0; x < xyz_frame->size().width; ++x) {
assert (*xyz_x >= 0 && *xyz_y >= 0 && *xyz_z >= 0 && *xyz_x < 4096 && *xyz_y < 4096 && *xyz_z < 4096);
/* In gamma LUT */
s.x = lut_in->lut()[*xyz_x++];
s.y = lut_in->lut()[*xyz_y++];
s.z = lut_in->lut()[*xyz_z++];
/* DCI companding */
s.x /= DCI_COEFFICIENT;
s.y /= DCI_COEFFICIENT;
s.z /= DCI_COEFFICIENT;
/* XYZ to RGB */
d.r = ((s.x * colour_matrix::xyz_to_rgb[0][0]) + (s.y * colour_matrix::xyz_to_rgb[0][1]) + (s.z * colour_matrix::xyz_to_rgb[0][2]));
d.g = ((s.x * colour_matrix::xyz_to_rgb[1][0]) + (s.y * colour_matrix::xyz_to_rgb[1][1]) + (s.z * colour_matrix::xyz_to_rgb[1][2]));
d.b = ((s.x * colour_matrix::xyz_to_rgb[2][0]) + (s.y * colour_matrix::xyz_to_rgb[2][1]) + (s.z * colour_matrix::xyz_to_rgb[2][2]));
d.r = min (d.r, 1.0);
d.r = max (d.r, 0.0);
d.g = min (d.g, 1.0);
d.g = max (d.g, 0.0);
d.b = min (d.b, 1.0);
d.b = max (d.b, 0.0);
/* Out gamma LUT */
*buffer_line++ = lut_out->lut()[(int) (d.r * max_colour)] * 0xff;
*buffer_line++ = lut_out->lut()[(int) (d.g * max_colour)] * 0xff;
*buffer_line++ = lut_out->lut()[(int) (d.b * max_colour)] * 0xff;
}
buffer += xyz_frame->size().width * 3;
}
}
shared_ptr<dcp::XYZFrame>
dcp::rgb_to_xyz (
boost::shared_ptr<const Image> rgb,
boost::shared_ptr<const GammaLUT> lut_in,
boost::shared_ptr<const GammaLUT> lut_out,
double const colour_matrix[3][3]
)
{
assert (lut_in->bit_depth() == 12);
assert (lut_out->bit_depth() == 16);
shared_ptr<XYZFrame> xyz (new XYZFrame (rgb->size ()));
struct {
double r, g, b;
} s;
struct {
double x, y, z;
} d;
int jn = 0;
for (int y = 0; y < rgb->size().height; ++y) {
uint8_t* p = rgb->data()[0] + y * rgb->stride()[0];
for (int x = 0; x < rgb->size().width; ++x) {
/* In gamma LUT (converting 8-bit input to 12-bit) */
s.r = lut_in->lut()[*p++ << 4];
s.g = lut_in->lut()[*p++ << 4];
s.b = lut_in->lut()[*p++ << 4];
/* RGB to XYZ Matrix */
d.x = ((s.r * colour_matrix[0][0]) +
(s.g * colour_matrix[0][1]) +
(s.b * colour_matrix[0][2]));
d.y = ((s.r * colour_matrix[1][0]) +
(s.g * colour_matrix[1][1]) +
(s.b * colour_matrix[1][2]));
d.z = ((s.r * colour_matrix[2][0]) +
(s.g * colour_matrix[2][1]) +
(s.b * colour_matrix[2][2]));
/* DCI companding */
d.x = d.x * DCI_COEFFICIENT * 65535;
d.y = d.y * DCI_COEFFICIENT * 65535;
d.z = d.z * DCI_COEFFICIENT * 65535;
assert (d.x >= 0 && d.x < 65536);
assert (d.y >= 0 && d.y < 65536);
assert (d.z >= 0 && d.z < 65536);
/* Out gamma LUT */
xyz->data(0)[jn] = lut_out->lut()[(int) d.x] * 4096;
xyz->data(1)[jn] = lut_out->lut()[(int) d.y] * 4096;
xyz->data(2)[jn] = lut_out->lut()[(int) d.z] * 4096;
++jn;
}
}
return xyz;
}
|
