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
|
/* Lab2LabQ: quantise FLOAT Lab image into 10 11 11 format
*
* 4 bytes per pel: l a b lsbs
* this is an image wrapper which calls line-wise packing
* Copyright K.Martinez 3/5/93
* Modified:
* 7/6/93 JC
* - adapted for partial v2
* 5/5/94 JC
* - some nint->+0.5, for speed and to ease portability
* - other nint->rint
* - now inclues <math.h>!
* 15/11/94 JC
* - all nint(), rint() removed for speed
* - now -128 rather than -127 for a, b
* - checks input type properly
* 16/11/94 JC
* - uses new im_wrap_oneonebuf()
* 22/5/95 JC
* - changed L to scale by 10.24, not 10.23
* 11/7/95 JC
* - now uses IM_RINT() for rounding
* 4/9/97 JC
* - L* = 100.0 now allowed
* 5/11/00 JC
* - go int earlier for speed up
* 20/6/02 JC
* - oops, were not clipping a/b range correctly
* 1/11/09
* - gtkdoc
* - cleanups
* 20/9/12
* - redo as a class
*/
/*
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 <vips/intl.h>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#include "pcolour.h"
typedef VipsColourCode VipsLab2LabQ;
typedef VipsColourCodeClass VipsLab2LabQClass;
G_DEFINE_TYPE( VipsLab2LabQ, vips_Lab2LabQ, VIPS_TYPE_COLOUR_CODE );
/* @(#) convert float Lab to packed Lab32 format 10 11 11 bits
* works only on buffers, not IMAGEs
* Copyright 1993 K.Martinez
* Modified: 3/5/93, 16/6/93
*/
static void
vips_Lab2LabQ_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
{
float * restrict p = (float *) in[0];
VipsPel * restrict q = out;
int i;
for( i = 0; i < width; i++ ) {
float fval;
int lsbs;
int intv;
/* Scale L up to 10 bits.
*/
intv = VIPS_ROUND_UINT( 10.23 * p[0] );
intv = VIPS_CLIP( 0, intv, 1023 );
lsbs = (intv & 0x3) << 6; /* 00000011 -> 11000000 */
q[0] = intv >> 2; /* drop bot 2 bits and store */
fval = 8.0 * p[1]; /* do a */
intv = VIPS_RINT( fval );
intv = VIPS_CLIP( -1024, intv, 1023 );
lsbs |= (intv & 0x7) << 3; /* 00000111 -> 00111000 */
q[1] = intv >> 3; /* drop bot 3 bits & store */
fval = 8.0 * p[2]; /* do b */
intv = VIPS_RINT( fval );
intv = VIPS_CLIP( -1024, intv, 1023 );
lsbs |= (intv & 0x7);
q[2] = intv >> 3;
q[3] = lsbs; /* store lsb band */
p += 3;
q += 4;
}
}
void
vips__Lab2LabQ_vec( VipsPel *out, float *in, int width )
{
vips_Lab2LabQ_line( NULL, out, (VipsPel **) &in, width );
}
static void
vips_Lab2LabQ_class_init( VipsLab2LabQClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
object_class->nickname = "Lab2LabQ";
object_class->description = _( "transform float Lab to LabQ coding" );
colour_class->process_line = vips_Lab2LabQ_line;
}
static void
vips_Lab2LabQ_init( VipsLab2LabQ *Lab2LabQ )
{
VipsColour *colour = VIPS_COLOUR( Lab2LabQ );
VipsColourCode *code = VIPS_COLOUR_CODE( Lab2LabQ );
colour->coding = VIPS_CODING_LABQ;
colour->interpretation = VIPS_INTERPRETATION_LABQ;
colour->format = VIPS_FORMAT_UCHAR;
colour->input_bands = 3;
colour->bands = 4;
code->input_coding = VIPS_CODING_NONE;
code->input_format = VIPS_FORMAT_FLOAT;
}
/**
* vips_Lab2LabQ:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Convert a Lab three-band float image to LabQ (#VIPS_CODING_LABQ).
*
* See also: vips_LabQ2Lab().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_Lab2LabQ( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "Lab2LabQ", ap, in, out );
va_end( ap );
return( result );
}
|
