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Fri, Sep 6, 02:18 (2 d)
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blob
Format
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Handle
20509101
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R6289 Motion correction paper
io.cpp
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/*
Copyright (C) 2014 Jerome Revaud
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 3 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, see <http://www.gnu.org/licenses/>
*/
#include "std.h"
#include <stdio.h>
#include <jpeglib.h>
#include <png.h>
#include <setjmp.h>
#include "io.h"
void
output_correspondences
(
const
char
*
out_filename
,
const
corres_t
*
corres
,
int
nb
,
float
fx
,
float
fy
)
{
assert
(
0
<
fx
&&
fx
<=
2
);
assert
(
0
<
fy
&&
fy
<=
2
);
FILE
*
f
=
out_filename
?
fopen
(
out_filename
,
"w"
)
:
NULL
;
for
(
int
i
=
0
;
i
<
nb
;
i
++
)
{
const
corres_t
*
r
=
corres
+
i
;
// one row
if
(
f
)
fprintf
(
f
,
"%g %g %g %g %g %g
\n
"
,
fx
*
r
->
x0
,
fy
*
r
->
y0
,
fx
*
r
->
x1
,
fy
*
r
->
y1
,
r
->
maxima
,
r
->
score
);
else
std_printf
(
"%g %g %g %g %g %g
\n
"
,
fx
*
r
->
x0
,
fy
*
r
->
y0
,
fx
*
r
->
x1
,
fy
*
r
->
y1
,
r
->
maxima
,
r
->
score
);
}
if
(
out_filename
)
fclose
(
f
);
}
/* IMAGE */
// PPM
typedef
struct
{
int
magic
;
int
width
;
int
height
;
int
pixmax
;
}
ppm_hdr_t
;
static
void
get_magic
(
FILE
*
fp
,
ppm_hdr_t
*
ppm_hdr
)
{
char
str
[
1024
];
fgets
(
str
,
1024
,
fp
);
if
(
str
[
0
]
==
'P'
&&
(
str
[
1
]
<=
'6'
||
str
[
1
]
>=
'1'
))
{
ppm_hdr
->
magic
=
str
[
1
]
-
'0'
;
}
}
static
int
skip_comment
(
FILE
*
fp
)
{
char
c
;
do
{
c
=
(
char
)
fgetc
(
fp
);
}
while
(
c
==
' '
||
c
==
'\t'
||
c
==
'\n'
);
if
(
c
==
'#'
)
{
do
{
c
=
(
char
)
fgetc
(
fp
);
}
while
(
c
!=
0x0A
);
return
1
;
}
else
{
ungetc
(
c
,
fp
);
}
return
0
;
}
/*----------------------------------------------------------------------------*/
static
void
skip_comments
(
FILE
*
fp
)
{
while
(
skip_comment
(
fp
));
}
/*----------------------------------------------------------------------------*/
static
int
get_image_size
(
FILE
*
fp
,
ppm_hdr_t
*
ppm_hdr
)
{
skip_comments
(
fp
);
if
(
fscanf
(
fp
,
"%d %d"
,
&
ppm_hdr
->
width
,
&
ppm_hdr
->
height
)
!=
2
)
{
err_printf
(
"Warning: PGM --> File currupted
\n
"
);
return
0
;
}
return
1
;
}
/*----------------------------------------------------------------------------*/
static
int
get_pixmax
(
FILE
*
fp
,
ppm_hdr_t
*
ppm_hdr
)
{
skip_comments
(
fp
);
ppm_hdr
->
pixmax
=
1
;
if
(
ppm_hdr
->
magic
==
2
||
ppm_hdr
->
magic
==
3
||
ppm_hdr
->
magic
==
5
||
ppm_hdr
->
magic
==
6
)
{
if
(
fscanf
(
fp
,
"%d"
,
&
ppm_hdr
->
pixmax
)
!=
1
)
{
err_printf
(
"Warning: PGM --> pixmax not valid
\n
"
);
return
0
;
}
}
fgetc
(
fp
);
return
1
;
}
/*----------------------------------------------------------------------------*/
static
int
get_ppm_hdr
(
FILE
*
fp
,
ppm_hdr_t
*
ppm_hdr
)
{
get_magic
(
fp
,
ppm_hdr
);
if
(
!
get_image_size
(
fp
,
ppm_hdr
))
{
return
0
;
}
if
(
!
get_pixmax
(
fp
,
ppm_hdr
))
{
return
0
;
}
return
1
;
}
static
void
raw_read_color
(
FILE
*
fp
,
color_image_t
*
image
)
{
int
i
,
size
=
image
->
height
*
image
->
width
;
for
(
i
=
0
;
i
<
size
;
i
++
)
{
image
->
c1
[
i
]
=
(
float
)
fgetc
(
fp
);
image
->
c2
[
i
]
=
(
float
)
fgetc
(
fp
);
image
->
c3
[
i
]
=
(
float
)
fgetc
(
fp
);
}
}
color_image_t
*
color_image_pnm_load
(
FILE
*
fp
)
{
color_image_t
*
image
=
NULL
;
ppm_hdr_t
ppm_hdr
;
if
(
!
get_ppm_hdr
(
fp
,
&
ppm_hdr
))
{
return
NULL
;
}
switch
(
ppm_hdr
.
magic
)
{
case
1
:
/* PBM ASCII */
case
2
:
/* PGM ASCII */
case
3
:
/* PPM ASCII */
case
4
:
/* PBM RAW */
case
5
:
/* PGM RAW */
err_printf
(
"color_image_pnm_load: only PPM raw with maxval 255 supported
\n
"
);
break
;
case
6
:
/* PPM RAW */
image
=
color_image_new
(
ppm_hdr
.
width
,
ppm_hdr
.
height
);
raw_read_color
(
fp
,
image
);
break
;
}
return
image
;
}
// JPG
color_image_t
*
color_image_jpeg_load
(
FILE
*
fp
)
{
struct
jpeg_decompress_struct
cinfo
;
struct
jpeg_error_mgr
jerr
;
JSAMPARRAY
buffer
;
int
row_stride
;
int
index
=
0
;
color_image_t
*
image
=
NULL
;
float
*
r_p
,
*
g_p
,
*
b_p
;
JSAMPROW
buffer_p
;
cinfo
.
err
=
jpeg_std_error
(
&
jerr
);
jpeg_create_decompress
(
&
cinfo
);
jpeg_stdio_src
(
&
cinfo
,
fp
);
jpeg_read_header
(
&
cinfo
,
TRUE
);
cinfo
.
out_color_space
=
JCS_RGB
;
cinfo
.
quantize_colors
=
FALSE
;
image
=
color_image_new
(
cinfo
.
image_width
,
cinfo
.
image_height
);
if
(
image
==
NULL
)
{
return
NULL
;
}
jpeg_start_decompress
(
&
cinfo
);
row_stride
=
cinfo
.
output_width
*
cinfo
.
output_components
;
buffer
=
(
*
cinfo
.
mem
->
alloc_sarray
)
((
j_common_ptr
)
&
cinfo
,
JPOOL_IMAGE
,
row_stride
,
1
);
r_p
=
image
->
c1
;
g_p
=
image
->
c2
;
b_p
=
image
->
c3
;
while
(
cinfo
.
output_scanline
<
cinfo
.
output_height
)
{
jpeg_read_scanlines
(
&
cinfo
,
buffer
,
1
);
buffer_p
=
buffer
[
0
];
index
=
cinfo
.
output_width
;
while
(
index
--
)
{
*
r_p
++
=
(
float
)
*
buffer_p
++
;
*
g_p
++
=
(
float
)
*
buffer_p
++
;
*
b_p
++
=
(
float
)
*
buffer_p
++
;
}
}
jpeg_finish_decompress
(
&
cinfo
);
jpeg_destroy_decompress
(
&
cinfo
);
return
image
;
}
color_image_t
*
color_image_png_load
(
FILE
*
fp
,
const
char
*
file_name
)
{
// read the header
png_byte
header
[
8
];
fread
(
header
,
1
,
8
,
fp
);
if
(
png_sig_cmp
(
header
,
0
,
8
))
{
err_printf
(
"error: %s is not a PNG.
\n
"
,
file_name
);
fclose
(
fp
);
return
0
;
}
png_structp
png_ptr
=
png_create_read_struct
(
PNG_LIBPNG_VER_STRING
,
NULL
,
NULL
,
NULL
);
if
(
!
png_ptr
)
{
err_printf
(
"error: png_create_read_struct returned 0.
\n
"
);
fclose
(
fp
);
return
0
;
}
// create png info struct
png_infop
info_ptr
=
png_create_info_struct
(
png_ptr
);
if
(
!
info_ptr
)
{
err_printf
(
"error: png_create_info_struct returned 0.
\n
"
);
png_destroy_read_struct
(
&
png_ptr
,
(
png_infopp
)
NULL
,
(
png_infopp
)
NULL
);
fclose
(
fp
);
return
0
;
}
// create png info struct
png_infop
end_info
=
png_create_info_struct
(
png_ptr
);
if
(
!
end_info
)
{
err_printf
(
"error: png_create_info_struct returned 0.
\n
"
);
png_destroy_read_struct
(
&
png_ptr
,
&
info_ptr
,
(
png_infopp
)
NULL
);
fclose
(
fp
);
return
0
;
}
// the code in this if statement gets called if libpng encounters an error
if
(
setjmp
(
png_jmpbuf
(
png_ptr
)))
{
err_printf
(
"error from libpng
\n
"
);
png_destroy_read_struct
(
&
png_ptr
,
&
info_ptr
,
&
end_info
);
fclose
(
fp
);
return
0
;
}
// init png reading
png_init_io
(
png_ptr
,
fp
);
// let libpng know you already read the first 8 bytes
png_set_sig_bytes
(
png_ptr
,
8
);
// read all the info up to the image data
png_read_info
(
png_ptr
,
info_ptr
);
// variables to pass to get info
int
bit_depth
,
color_type
;
png_uint_32
temp_width
,
temp_height
;
// get info about png
png_get_IHDR
(
png_ptr
,
info_ptr
,
&
temp_width
,
&
temp_height
,
&
bit_depth
,
&
color_type
,
NULL
,
NULL
,
NULL
);
// Update the png info struct.
png_read_update_info
(
png_ptr
,
info_ptr
);
// Row size in bytes.
int
rowbytes
=
png_get_rowbytes
(
png_ptr
,
info_ptr
);
// Allocate the image_data as a big block, to be given to opengl
png_byte
*
image_data
;
image_data
=
NEWA
(
png_byte
,
rowbytes
*
temp_height
);
assert
(
image_data
!=
NULL
);
// row_pointers is for pointing to image_data for reading the png with libpng
png_bytep
*
row_pointers
=
NEWA
(
png_bytep
,
temp_height
);
assert
(
row_pointers
!=
NULL
);
// set the individual row_pointers to point at the correct offsets of image_data
unsigned
int
i
;
for
(
i
=
0
;
i
<
temp_height
;
i
++
)
row_pointers
[
i
]
=
image_data
+
i
*
rowbytes
;
// read the png into image_data through row_pointers
png_read_image
(
png_ptr
,
row_pointers
);
// copy into color image
color_image_t
*
image
=
color_image_new
(
temp_width
,
temp_height
);
if
(
color_type
==
0
)
{
assert
((
unsigned
)
rowbytes
==
temp_width
||
!
"error: not a proper gray png image"
);
for
(
i
=
0
;
i
<
temp_width
*
temp_height
;
i
++
)
image
->
c1
[
i
]
=
image
->
c2
[
i
]
=
image
->
c3
[
i
]
=
image_data
[
i
];
}
else
if
(
color_type
==
2
)
{
assert
((
unsigned
)
rowbytes
==
3
*
temp_width
||
!
"error: not a proper color png image"
);
for
(
i
=
0
;
i
<
temp_width
*
temp_height
;
i
++
)
{
image
->
c1
[
i
]
=
image_data
[
3
*
i
+
0
];
image
->
c2
[
i
]
=
image_data
[
3
*
i
+
1
];
image
->
c3
[
i
]
=
image_data
[
3
*
i
+
2
];
}
}
else
assert
(
!
"error: unknown PNG color type"
);
// clean up
png_destroy_read_struct
(
&
png_ptr
,
&
info_ptr
,
&
end_info
);
free
(
row_pointers
);
free
(
image_data
);
return
image
;
}
// GENERAL LOAD
/* load a color image from a file */
color_image_t
*
color_image_load
(
const
char
*
fname
)
{
FILE
*
fp
;
char
magic
[
2
];
unsigned
short
*
magic_short
=
(
unsigned
short
*
)
magic
;
color_image_t
*
image
=
NULL
;
if
((
fp
=
fopen
(
fname
,
"rb"
))
==
NULL
)
{
err_printf
(
"Warning: color_image_load() - can not open file `%s' !
\n
"
,
fname
);
return
NULL
;
}
fread
(
magic
,
sizeof
(
char
),
2
,
fp
);
rewind
(
fp
);
if
(
magic_short
[
0
]
==
0xd8ff
)
{
image
=
color_image_jpeg_load
(
fp
);
}
else
if
(
magic
[
0
]
==
'P'
&&
(
magic
[
1
]
==
'6'
||
magic
[
1
]
==
'5'
))
{
/* PPM raw */
image
=
color_image_pnm_load
(
fp
);
}
else
if
(
magic
[
0
]
==-
119
&&
magic
[
1
]
==
'P'
)
{
image
=
color_image_png_load
(
fp
,
fname
);
}
else
{
err_printf
(
"Warning: color_image_load(%s) - image format not recognized
\n
"
,
fname
);
}
fclose
(
fp
);
return
image
;
}
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