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gnuplot/src/wxterminal/gp_cairo_helpers.c at 5.5 · gnuplot/gnuplot · GitHub
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/* GNUPLOT - gp_cairo_helpers.c */
/*[
* Copyright 2009 Timothee Lecomte
*
* Permission to use, copy, and distribute this software and its
* documentation for any purpose with or without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
*
* Permission to modify the software is granted, but not the right to
* distribute the complete modified source code. Modifications are to
* be distributed as patches to the released version. Permission to
* distribute binaries produced by compiling modified sources is granted,
* provided you
* 1. distribute the corresponding source modifications from the
* released version in the form of a patch file along with the binaries,
* 2. add special version identification to distinguish your version
* in addition to the base release version number,
* 3. provide your name and address as the primary contact for the
* support of your modified version, and
* 4. retain our contact information in regard to use of the base
* software.
* Permission to distribute the released version of the source code along
* with corresponding source modifications in the form of a patch file is
* granted with same provisions 2 through 4 for binary distributions.
*
* This software is provided "as is" without express or implied warranty
* to the extent permitted by applicable law.
*
*
* Alternatively, the contents of this file may be used under the terms of the
* GNU General Public License Version 2 or later (the "GPL"), in which case the
* provisions of GPL are applicable instead of those above. If you wish to allow
* use of your version of this file only under the terms of the GPL and not
* to allow others to use your version of this file under the above gnuplot
* license, indicate your decision by deleting the provisions above and replace
* them with the notice and other provisions required by the GPL. If you do not
* delete the provisions above, a recipient may use your version of this file
* under either the GPL or the gnuplot license.
]*/
#include
"gp_cairo_helpers.h"
#include
"alloc.h"
/* for rgb functions */
# include
"getcolor.h"
unsigned
int
*
gp_cairo_helper_coordval_to_chars
(
coordval
*
image
,
int
M
,
int
N
,
t_imagecolor
color_mode
)
{
int
m
,
n
;
unsigned
int
*
image255
,
*
image255copy
;
rgb_color
rgb1
;
rgb255_color
rgb255
;
/* cairo image buffer, upper bits are alpha, then r, g and b
* Depends on endianess */
image255
=
(
unsigned
int
*
)
malloc
(
M
*
N
*
sizeof
(
unsigned
int
));
if
(!
image255
) {
fprintf
(
stderr
,
"cairo terminal: out of memory!\n"
);
gp_exit
(
EXIT_FAILURE
);}
image255copy
=
image255
;
/* TrueColor 24-bit plot->color mode */
if
(
color_mode
==
IC_RGB
) {
for
(
n
=
0
;
n
<
N
;
n
++
) {
for
(
m
=
0
;
m
<
M
;
m
++
) {
rgb1
.
r
=
*
image
++
;
rgb1
.
g
=
*
image
++
;
rgb1
.
b
=
*
image
++
;
rgb255_from_rgb1
(
rgb1
,
&
rgb255
);
*
image255copy
++
=
(
0xFF
<<
24
)
+
(
rgb255
.
r
<<
16
)
+
(
rgb255
.
g
<<
8
)
+
rgb255
.
b
;
}
}
}
else
if
(
color_mode
==
IC_RGBA
) {
unsigned
char
alpha255
;
double
alpha1
;
for
(
n
=
0
;
n
<
N
;
n
++
) {
for
(
m
=
0
;
m
<
M
;
m
++
) {
alpha255
=
*
(
image
+
3
);
alpha1
=
(
float
)
alpha255
/
255.
;
rgb1
.
r
=
alpha1
*
(
*
image
++
);
rgb1
.
g
=
alpha1
*
(
*
image
++
);
rgb1
.
b
=
alpha1
*
(
*
image
++
);
image
++
;
rgb255_from_rgb1
(
rgb1
,
&
rgb255
);
*
image255copy
++
=
(
alpha255
<<
24
)
+
(
rgb255
.
r
<<
16
)
+
(
rgb255
.
g
<<
8
)
+
rgb255
.
b
;
}
}
/* Palette plot->color lookup from gray value */
}
else
{
for
(
n
=
0
;
n
<
N
;
n
++
) {
for
(
m
=
0
;
m
<
M
;
m
++
) {
if
(
isnan
(
*
image
)) {
image
++
;
*
image255copy
++
=
0x00000000
;
}
else
{
rgb255maxcolors_from_gray
(
*
image
++
,
&
rgb255
);
*
image255copy
++
=
(
0xFF
<<
24
)
+
(
rgb255
.
r
<<
16
)
+
(
rgb255
.
g
<<
8
)
+
rgb255
.
b
;
}
}
}
}
return
image255
;
}
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