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
|
/* Turn scRGB into greyscale.
*
* 17/4/15
* - from scRGB2BW.c
* 16/4/25
* - move on top of ColourCode
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#include "pcolour.h"
typedef struct _VipsscRGB2BW {
VipsColourCode parent_instance;
int depth;
} VipsscRGB2BW;
typedef VipsColourCodeClass VipsscRGB2BWClass;
G_DEFINE_TYPE(VipsscRGB2BW, vips_scRGB2BW, VIPS_TYPE_COLOUR_CODE);
static void
vips_scRGB2BW_line(VipsColour *colour, VipsPel *out, VipsPel **in, int width)
{
VipsscRGB2BW *scRGB2BW = (VipsscRGB2BW *) colour;
if (scRGB2BW->depth == 16) {
unsigned short *restrict q;
float *restrict p;
q = (unsigned short *) out;
p = (float *) in[0];
for (int i = 0; i < width; i++) {
const float R = p[0];
const float G = p[1];
const float B = p[2];
int g;
int og;
vips_col_scRGB2BW_16(R, G, B, &g, &og);
q[0] = g;
p += 3;
q += 1;
}
}
else {
unsigned char *restrict q;
float *restrict p;
q = (unsigned char *) out;
p = (float *) in[0];
for (int i = 0; i < width; i++) {
const float R = p[0];
const float G = p[1];
const float B = p[2];
int g;
int og;
vips_col_scRGB2BW_8(R, G, B, &g, &og);
q[0] = g;
p += 3;
q += 1;
}
}
}
static int
vips_scRGB2BW_build(VipsObject *object)
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS(object);
VipsscRGB2BW *scRGB2BW = (VipsscRGB2BW *) object;
VipsColour *colour = (VipsColour *) object;
VipsColourCode *code = (VipsColourCode *) object;
// input image we want
code->input_format = VIPS_FORMAT_FLOAT;
colour->input_bands = 3;
// output image we make
switch (scRGB2BW->depth) {
case 16:
colour->interpretation = VIPS_INTERPRETATION_GREY16;
colour->format = VIPS_FORMAT_USHORT;
break;
case 8:
colour->interpretation = VIPS_INTERPRETATION_B_W;
colour->format = VIPS_FORMAT_UCHAR;
break;
default:
vips_error(class->nickname, "%s", _("depth must be 8 or 16"));
return -1;
}
colour->bands = 1;
return VIPS_OBJECT_CLASS(vips_scRGB2BW_parent_class)->build(object);
}
static void
vips_scRGB2BW_class_init(VipsscRGB2BWClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS(class);
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS(class);
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "scRGB2BW";
object_class->description = _("convert scRGB to BW");
object_class->build = vips_scRGB2BW_build;
colour_class->process_line = vips_scRGB2BW_line;
VIPS_ARG_INT(class, "depth", 130,
_("Depth"),
_("Output device space depth in bits"),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET(VipsscRGB2BW, depth),
8, 16, 8);
}
static void
vips_scRGB2BW_init(VipsscRGB2BW *scRGB2BW)
{
scRGB2BW->depth = 8;
}
/**
* vips_scRGB2BW: (method)
* @in: input image
* @out: (out): output image
* @...: `NULL`-terminated list of optional named arguments
*
* Convert an scRGB image to greyscale. Set @depth to 16 to get 16-bit output.
*
* ::: tip "Optional arguments"
* * @depth: `gint`, depth of output image in bits
*
* ::: seealso
* [method@Image.LabS2LabQ], [method@Image.sRGB2scRGB],
* [method@Image.rad2float].
*
* Returns: 0 on success, -1 on error.
*/
int
vips_scRGB2BW(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("scRGB2BW", ap, in, out);
va_end(ap);
return result;
}
|
