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体验新版 GitCode,发现更多精彩内容 >>
提交
e0e4bd4d
编写于
5月 11, 2015
作者:
F
fahickman
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
write TGAs with RLE compression
上级
947bdcd0
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
104 addition
and
30 deletion
+104
-30
stb_image_write.h
stb_image_write.h
+104
-30
未找到文件。
stb_image_write.h
浏览文件 @
e0e4bd4d
...
...
@@ -149,6 +149,14 @@ static void writefv(FILE *f, const char *fmt, va_list v)
}
}
static
void
writef
(
FILE
*
f
,
const
char
*
fmt
,
...)
{
va_list
v
;
va_start
(
v
,
fmt
);
writefv
(
f
,
fmt
,
v
);
va_end
(
v
);
}
static
void
write3
(
FILE
*
f
,
unsigned
char
a
,
unsigned
char
b
,
unsigned
char
c
)
{
unsigned
char
arr
[
3
];
...
...
@@ -156,11 +164,42 @@ static void write3(FILE *f, unsigned char a, unsigned char b, unsigned char c)
fwrite
(
arr
,
3
,
1
,
f
);
}
static
void
write_pixel
s
(
FILE
*
f
,
int
rgb_dir
,
int
vdir
,
int
x
,
int
y
,
int
comp
,
void
*
data
,
int
write_alpha
,
int
scanline_pad
,
int
expand_mono
)
static
void
write_pixel
(
FILE
*
f
,
int
rgb_dir
,
int
comp
,
int
write_alpha
,
int
expand_mono
,
const
unsigned
char
*
d
)
{
unsigned
char
bg
[
3
]
=
{
255
,
0
,
255
},
px
[
3
];
int
k
;
if
(
write_alpha
<
0
)
fwrite
(
&
d
[
comp
-
1
],
1
,
1
,
f
);
switch
(
comp
)
{
case
1
:
fwrite
(
d
,
1
,
1
,
f
);
break
;
case
2
:
if
(
expand_mono
)
write3
(
f
,
d
[
0
],
d
[
0
],
d
[
0
]);
// monochrome bmp
else
fwrite
(
d
,
1
,
1
,
f
);
// monochrome TGA
break
;
case
4
:
if
(
!
write_alpha
)
{
// composite against pink background
for
(
k
=
0
;
k
<
3
;
++
k
)
px
[
k
]
=
bg
[
k
]
+
((
d
[
k
]
-
bg
[
k
])
*
d
[
3
])
/
255
;
write3
(
f
,
px
[
1
-
rgb_dir
],
px
[
1
],
px
[
1
+
rgb_dir
]);
break
;
}
/* FALLTHROUGH */
case
3
:
write3
(
f
,
d
[
1
-
rgb_dir
],
d
[
1
],
d
[
1
+
rgb_dir
]);
break
;
}
if
(
write_alpha
>
0
)
fwrite
(
&
d
[
comp
-
1
],
1
,
1
,
f
);
}
static
void
write_pixels
(
FILE
*
f
,
int
rgb_dir
,
int
vdir
,
int
x
,
int
y
,
int
comp
,
void
*
data
,
int
write_alpha
,
int
scanline_pad
,
int
expand_mono
)
{
stbiw_uint32
zero
=
0
;
int
i
,
j
,
k
,
j_end
;
int
i
,
j
,
j_end
;
if
(
y
<=
0
)
return
;
...
...
@@ -173,31 +212,7 @@ static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp,
for
(;
j
!=
j_end
;
j
+=
vdir
)
{
for
(
i
=
0
;
i
<
x
;
++
i
)
{
unsigned
char
*
d
=
(
unsigned
char
*
)
data
+
(
j
*
x
+
i
)
*
comp
;
if
(
write_alpha
<
0
)
fwrite
(
&
d
[
comp
-
1
],
1
,
1
,
f
);
switch
(
comp
)
{
case
1
:
fwrite
(
d
,
1
,
1
,
f
);
break
;
case
2
:
if
(
expand_mono
)
write3
(
f
,
d
[
0
],
d
[
0
],
d
[
0
]);
// monochrome bmp
else
fwrite
(
d
,
1
,
1
,
f
);
// monochrome TGA
break
;
case
4
:
if
(
!
write_alpha
)
{
// composite against pink background
for
(
k
=
0
;
k
<
3
;
++
k
)
px
[
k
]
=
bg
[
k
]
+
((
d
[
k
]
-
bg
[
k
])
*
d
[
3
])
/
255
;
write3
(
f
,
px
[
1
-
rgb_dir
],
px
[
1
],
px
[
1
+
rgb_dir
]);
break
;
}
/* FALLTHROUGH */
case
3
:
write3
(
f
,
d
[
1
-
rgb_dir
],
d
[
1
],
d
[
1
+
rgb_dir
]);
break
;
}
if
(
write_alpha
>
0
)
fwrite
(
&
d
[
comp
-
1
],
1
,
1
,
f
);
write_pixel
(
f
,
rgb_dir
,
comp
,
write_alpha
,
expand_mono
,
d
);
}
fwrite
(
&
zero
,
scanline_pad
,
1
,
f
);
}
...
...
@@ -232,9 +247,68 @@ int stbi_write_tga(char const *filename, int x, int y, int comp, const void *dat
{
int
has_alpha
=
(
comp
==
2
||
comp
==
4
);
int
colorbytes
=
has_alpha
?
comp
-
1
:
comp
;
int
format
=
colorbytes
<
2
?
3
:
2
;
// 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3
return
outfile
(
filename
,
-
1
,
-
1
,
x
,
y
,
comp
,
0
,
(
void
*
)
data
,
has_alpha
,
0
,
"111 221 2222 11"
,
0
,
0
,
format
,
0
,
0
,
0
,
0
,
0
,
x
,
y
,
(
colorbytes
+
has_alpha
)
*
8
,
has_alpha
*
8
);
int
format
=
colorbytes
<
2
?
11
:
10
;
// 3 color channels (RGB/RGBA) = 10, 1 color channel (Y/YA) = 11
FILE
*
f
;
if
(
y
<
0
||
x
<
0
)
return
0
;
f
=
fopen
(
filename
,
"wb"
);
if
(
f
)
{
int
i
,
j
,
k
;
writef
(
f
,
"111 221 2222 11"
,
0
,
0
,
format
,
0
,
0
,
0
,
0
,
0
,
x
,
y
,
24
+
8
*
has_alpha
,
8
*
has_alpha
);
for
(
j
=
y
-
1
;
j
>=
0
;
--
j
)
{
unsigned
char
*
line
=
(
unsigned
char
*
)
data
+
j
*
x
*
comp
;
int
run
;
for
(
i
=
0
;
i
<
x
;
i
+=
run
)
{
unsigned
char
*
first
=
line
+
i
*
comp
;
int
diff
=
1
;
run
=
1
;
if
(
i
<
x
-
1
)
{
++
run
;
diff
=
memcmp
(
first
,
line
+
(
i
+
1
)
*
comp
,
comp
);
if
(
diff
)
{
unsigned
char
*
next
=
first
;
for
(
k
=
i
+
2
;
k
<
x
&&
run
<
128
;
++
k
)
{
if
(
memcmp
(
next
,
line
+
k
*
comp
,
comp
))
{
next
+=
comp
;
++
run
;
}
else
{
--
run
;
break
;
}
}
}
else
{
for
(
k
=
i
+
2
;
k
<
x
&&
run
<
128
;
++
k
)
{
if
(
!
memcmp
(
first
,
line
+
k
*
comp
,
comp
))
{
++
run
;
}
else
{
break
;
}
}
}
}
if
(
diff
)
{
unsigned
char
header
=
(
unsigned
char
)
(
run
-
1
);
fwrite
(
&
header
,
1
,
1
,
f
);
for
(
k
=
0
;
k
<
run
;
++
k
)
{
write_pixel
(
f
,
-
1
,
comp
,
has_alpha
,
0
,
first
+
k
*
comp
);
}
}
else
{
unsigned
char
header
=
(
unsigned
char
)
(
run
-
1
)
|
0x80
;
fwrite
(
&
header
,
1
,
1
,
f
);
write_pixel
(
f
,
-
1
,
comp
,
has_alpha
,
0
,
first
);
}
}
}
fclose
(
f
);
}
return
f
!=
NULL
;
}
// *************************************************************************************************
...
...
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