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2549ffcd
编写于
3月 18, 2017
作者:
S
Sean Barrett
浏览文件
操作
浏览文件
下载
差异文件
Merge branch 'working'
上级
d459039f
c0539b4e
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
63 addition
and
59 deletion
+63
-59
stb_image_resize.h
stb_image_resize.h
+53
-54
tests/resample_test.cpp
tests/resample_test.cpp
+7
-5
tests/resample_test_c.c
tests/resample_test_c.c
+3
-0
未找到文件。
stb_image_resize.h
浏览文件 @
2549ffcd
/* stb_image_resize - v0.9
3
- public domain image resizing
/* stb_image_resize - v0.9
4
- public domain image resizing
by Jorge L Rodriguez (@VinoBS) - 2014
http://github.com/nothings/stb
...
...
@@ -107,8 +107,8 @@
industry, it is still uncommon in the videogame/real-time world.
If you linearly filter non-premultiplied alpha, strange effects
occur. (For example, the
average of 1% opaque
bright green
and
99% opaque
black produces 50% transparent dark green when
occur. (For example, the
50/50 average of 99% transparent
bright green
and
1% transparent
black produces 50% transparent dark green when
non-premultiplied, whereas premultiplied it produces 50%
transparent near-black. The former introduces green energy
that doesn't exist in the source image.)
...
...
@@ -152,18 +152,19 @@
(For example, graphics hardware does not apply sRGB conversion
to the alpha channel.)
ADDITIONAL CONTRIBUTORS
CONTRIBUTORS
Jorge L Rodriguez: Implementation
Sean Barrett: API design, optimizations
Aras Pranckevicius: bugfix
REVISIONS
0.94 (2017-03-18) fixed warnings
0.93 (2017-03-03) fixed bug with certain combinations of heights
0.92 (2017-01-02) fix integer overflow on large (>2GB) images
0.91 (2016-04-02) fix warnings; fix handling of subpixel regions
0.90 (2014-09-17) first released version
LICENSE
See end of file for license information.
TODO
...
...
@@ -551,16 +552,17 @@ typedef struct
int
encode_buffer_size
;
}
stbir__info
;
static
const
float
stbir__max_uint8_as_float
=
255
.
0
f
;
static
const
float
stbir__max_uint16_as_float
=
65535
.
0
f
;
static
const
double
stbir__max_uint32_as_float
=
4294967295
.
0
;
static
stbir__inline
int
stbir__min
(
int
a
,
int
b
)
{
return
a
<
b
?
a
:
b
;
}
static
stbir__inline
int
stbir__max
(
int
a
,
int
b
)
{
return
a
>
b
?
a
:
b
;
}
static
stbir__inline
float
stbir__saturate
(
float
x
)
{
if
(
x
<
0
)
...
...
@@ -1027,7 +1029,7 @@ static void stbir__calculate_sample_range_downsample(int n, float in_pixels_radi
*
out_last_pixel
=
(
int
)(
floor
(
out_pixel_influence_upperbound
-
0
.
5
));
}
static
void
stbir__calculate_coefficients_upsample
(
stbir_
_info
*
stbir_info
,
stbir_
filter
filter
,
float
scale
,
int
in_first_pixel
,
int
in_last_pixel
,
float
in_center_of_out
,
stbir__contributors
*
contributor
,
float
*
coefficient_group
)
static
void
stbir__calculate_coefficients_upsample
(
stbir_filter
filter
,
float
scale
,
int
in_first_pixel
,
int
in_last_pixel
,
float
in_center_of_out
,
stbir__contributors
*
contributor
,
float
*
coefficient_group
)
{
int
i
;
float
total_filter
=
0
;
...
...
@@ -1077,7 +1079,7 @@ static void stbir__calculate_coefficients_upsample(stbir__info* stbir_info, stbi
}
}
static
void
stbir__calculate_coefficients_downsample
(
stbir_
_info
*
stbir_info
,
stbir_
filter
filter
,
float
scale_ratio
,
int
out_first_pixel
,
int
out_last_pixel
,
float
out_center_of_in
,
stbir__contributors
*
contributor
,
float
*
coefficient_group
)
static
void
stbir__calculate_coefficients_downsample
(
stbir_filter
filter
,
float
scale_ratio
,
int
out_first_pixel
,
int
out_last_pixel
,
float
out_center_of_in
,
stbir__contributors
*
contributor
,
float
*
coefficient_group
)
{
int
i
;
...
...
@@ -1107,7 +1109,7 @@ static void stbir__calculate_coefficients_downsample(stbir__info* stbir_info, st
}
}
static
void
stbir__normalize_downsample_coefficients
(
stbir__
info
*
stbir_info
,
stbir__contributors
*
contributors
,
float
*
coefficients
,
stbir_filter
filter
,
float
scale_ratio
,
float
shift
,
int
input_size
,
int
output_size
)
static
void
stbir__normalize_downsample_coefficients
(
stbir__
contributors
*
contributors
,
float
*
coefficients
,
stbir_filter
filter
,
float
scale_ratio
,
int
input_size
,
int
output_size
)
{
int
num_contributors
=
stbir__get_contributors
(
scale_ratio
,
filter
,
input_size
,
output_size
);
int
num_coefficients
=
stbir__get_coefficient_width
(
filter
,
scale_ratio
);
...
...
@@ -1184,7 +1186,7 @@ static void stbir__normalize_downsample_coefficients(stbir__info* stbir_info, st
// Each scan line uses the same kernel values so we should calculate the kernel
// values once and then we can use them for every scan line.
static
void
stbir__calculate_filters
(
stbir__
info
*
stbir_info
,
stbir__
contributors
*
contributors
,
float
*
coefficients
,
stbir_filter
filter
,
float
scale_ratio
,
float
shift
,
int
input_size
,
int
output_size
)
static
void
stbir__calculate_filters
(
stbir__contributors
*
contributors
,
float
*
coefficients
,
stbir_filter
filter
,
float
scale_ratio
,
float
shift
,
int
input_size
,
int
output_size
)
{
int
n
;
int
total_contributors
=
stbir__get_contributors
(
scale_ratio
,
filter
,
input_size
,
output_size
);
...
...
@@ -1201,7 +1203,7 @@ static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributor
stbir__calculate_sample_range_upsample
(
n
,
out_pixels_radius
,
scale_ratio
,
shift
,
&
in_first_pixel
,
&
in_last_pixel
,
&
in_center_of_out
);
stbir__calculate_coefficients_upsample
(
stbir_info
,
filter
,
scale_ratio
,
in_first_pixel
,
in_last_pixel
,
in_center_of_out
,
stbir__get_contributor
(
contributors
,
n
),
stbir__get_coefficient
(
coefficients
,
filter
,
scale_ratio
,
n
,
0
));
stbir__calculate_coefficients_upsample
(
filter
,
scale_ratio
,
in_first_pixel
,
in_last_pixel
,
in_center_of_out
,
stbir__get_contributor
(
contributors
,
n
),
stbir__get_coefficient
(
coefficients
,
filter
,
scale_ratio
,
n
,
0
));
}
}
else
...
...
@@ -1217,10 +1219,10 @@ static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributor
stbir__calculate_sample_range_downsample
(
n_adjusted
,
in_pixels_radius
,
scale_ratio
,
shift
,
&
out_first_pixel
,
&
out_last_pixel
,
&
out_center_of_in
);
stbir__calculate_coefficients_downsample
(
stbir_info
,
filter
,
scale_ratio
,
out_first_pixel
,
out_last_pixel
,
out_center_of_in
,
stbir__get_contributor
(
contributors
,
n
),
stbir__get_coefficient
(
coefficients
,
filter
,
scale_ratio
,
n
,
0
));
stbir__calculate_coefficients_downsample
(
filter
,
scale_ratio
,
out_first_pixel
,
out_last_pixel
,
out_center_of_in
,
stbir__get_contributor
(
contributors
,
n
),
stbir__get_coefficient
(
coefficients
,
filter
,
scale_ratio
,
n
,
0
));
}
stbir__normalize_downsample_coefficients
(
stbir_info
,
contributors
,
coefficients
,
filter
,
scale_ratio
,
shift
,
input_size
,
output_size
);
stbir__normalize_downsample_coefficients
(
contributors
,
coefficients
,
filter
,
scale_ratio
,
input_size
,
output_size
);
}
}
...
...
@@ -1270,7 +1272,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int
decode_pixel_index
=
x
*
channels
;
int
input_pixel_index
=
stbir__edge_wrap
(
edge_horizontal
,
x
,
input_w
)
*
channels
;
for
(
c
=
0
;
c
<
channels
;
c
++
)
decode_buffer
[
decode_pixel_index
+
c
]
=
((
float
)((
const
unsigned
char
*
)
input_data
)[
input_pixel_index
+
c
])
/
255
;
decode_buffer
[
decode_pixel_index
+
c
]
=
((
float
)((
const
unsigned
char
*
)
input_data
)[
input_pixel_index
+
c
])
/
stbir__max_uint8_as_float
;
}
break
;
...
...
@@ -1283,7 +1285,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
decode_buffer
[
decode_pixel_index
+
c
]
=
stbir__srgb_uchar_to_linear_float
[((
const
unsigned
char
*
)
input_data
)[
input_pixel_index
+
c
]];
if
(
!
(
stbir_info
->
flags
&
STBIR_FLAG_ALPHA_USES_COLORSPACE
))
decode_buffer
[
decode_pixel_index
+
alpha_channel
]
=
((
float
)((
const
unsigned
char
*
)
input_data
)[
input_pixel_index
+
alpha_channel
])
/
255
;
decode_buffer
[
decode_pixel_index
+
alpha_channel
]
=
((
float
)((
const
unsigned
char
*
)
input_data
)[
input_pixel_index
+
alpha_channel
])
/
stbir__max_uint8_as_float
;
}
break
;
...
...
@@ -1293,7 +1295,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int
decode_pixel_index
=
x
*
channels
;
int
input_pixel_index
=
stbir__edge_wrap
(
edge_horizontal
,
x
,
input_w
)
*
channels
;
for
(
c
=
0
;
c
<
channels
;
c
++
)
decode_buffer
[
decode_pixel_index
+
c
]
=
((
float
)((
const
unsigned
short
*
)
input_data
)[
input_pixel_index
+
c
])
/
65535
;
decode_buffer
[
decode_pixel_index
+
c
]
=
((
float
)((
const
unsigned
short
*
)
input_data
)[
input_pixel_index
+
c
])
/
stbir__max_uint16_as_float
;
}
break
;
...
...
@@ -1303,10 +1305,10 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int
decode_pixel_index
=
x
*
channels
;
int
input_pixel_index
=
stbir__edge_wrap
(
edge_horizontal
,
x
,
input_w
)
*
channels
;
for
(
c
=
0
;
c
<
channels
;
c
++
)
decode_buffer
[
decode_pixel_index
+
c
]
=
stbir__srgb_to_linear
(((
float
)((
const
unsigned
short
*
)
input_data
)[
input_pixel_index
+
c
])
/
65535
);
decode_buffer
[
decode_pixel_index
+
c
]
=
stbir__srgb_to_linear
(((
float
)((
const
unsigned
short
*
)
input_data
)[
input_pixel_index
+
c
])
/
stbir__max_uint16_as_float
);
if
(
!
(
stbir_info
->
flags
&
STBIR_FLAG_ALPHA_USES_COLORSPACE
))
decode_buffer
[
decode_pixel_index
+
alpha_channel
]
=
((
float
)((
const
unsigned
short
*
)
input_data
)[
input_pixel_index
+
alpha_channel
])
/
65535
;
decode_buffer
[
decode_pixel_index
+
alpha_channel
]
=
((
float
)((
const
unsigned
short
*
)
input_data
)[
input_pixel_index
+
alpha_channel
])
/
stbir__max_uint16_as_float
;
}
break
;
...
...
@@ -1316,7 +1318,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int
decode_pixel_index
=
x
*
channels
;
int
input_pixel_index
=
stbir__edge_wrap
(
edge_horizontal
,
x
,
input_w
)
*
channels
;
for
(
c
=
0
;
c
<
channels
;
c
++
)
decode_buffer
[
decode_pixel_index
+
c
]
=
(
float
)(((
double
)((
const
unsigned
int
*
)
input_data
)[
input_pixel_index
+
c
])
/
4294967295
);
decode_buffer
[
decode_pixel_index
+
c
]
=
(
float
)(((
double
)((
const
unsigned
int
*
)
input_data
)[
input_pixel_index
+
c
])
/
stbir__max_uint32_as_float
);
}
break
;
...
...
@@ -1326,10 +1328,10 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int
decode_pixel_index
=
x
*
channels
;
int
input_pixel_index
=
stbir__edge_wrap
(
edge_horizontal
,
x
,
input_w
)
*
channels
;
for
(
c
=
0
;
c
<
channels
;
c
++
)
decode_buffer
[
decode_pixel_index
+
c
]
=
stbir__srgb_to_linear
((
float
)(((
double
)((
const
unsigned
int
*
)
input_data
)[
input_pixel_index
+
c
])
/
4294967295
));
decode_buffer
[
decode_pixel_index
+
c
]
=
stbir__srgb_to_linear
((
float
)(((
double
)((
const
unsigned
int
*
)
input_data
)[
input_pixel_index
+
c
])
/
stbir__max_uint32_as_float
));
if
(
!
(
stbir_info
->
flags
&
STBIR_FLAG_ALPHA_USES_COLORSPACE
))
decode_buffer
[
decode_pixel_index
+
alpha_channel
]
=
(
float
)(((
double
)((
const
unsigned
int
*
)
input_data
)[
input_pixel_index
+
alpha_channel
])
/
4294967295
);
decode_buffer
[
decode_pixel_index
+
alpha_channel
]
=
(
float
)(((
double
)((
const
unsigned
int
*
)
input_data
)[
input_pixel_index
+
alpha_channel
])
/
stbir__max_uint32_as_float
);
}
break
;
...
...
@@ -1431,11 +1433,10 @@ static float* stbir__add_empty_ring_buffer_entry(stbir__info* stbir_info, int n)
}
static
void
stbir__resample_horizontal_upsample
(
stbir__info
*
stbir_info
,
int
n
,
float
*
output_buffer
)
static
void
stbir__resample_horizontal_upsample
(
stbir__info
*
stbir_info
,
float
*
output_buffer
)
{
int
x
,
k
;
int
output_w
=
stbir_info
->
output_w
;
int
kernel_pixel_width
=
stbir_info
->
horizontal_filter_pixel_width
;
int
channels
=
stbir_info
->
channels
;
float
*
decode_buffer
=
stbir__get_decode_buffer
(
stbir_info
);
stbir__contributors
*
horizontal_contributors
=
stbir_info
->
horizontal_contributors
;
...
...
@@ -1515,12 +1516,10 @@ static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, int n,
}
}
static
void
stbir__resample_horizontal_downsample
(
stbir__info
*
stbir_info
,
int
n
,
float
*
output_buffer
)
static
void
stbir__resample_horizontal_downsample
(
stbir__info
*
stbir_info
,
float
*
output_buffer
)
{
int
x
,
k
;
int
input_w
=
stbir_info
->
input_w
;
int
output_w
=
stbir_info
->
output_w
;
int
kernel_pixel_width
=
stbir_info
->
horizontal_filter_pixel_width
;
int
channels
=
stbir_info
->
channels
;
float
*
decode_buffer
=
stbir__get_decode_buffer
(
stbir_info
);
stbir__contributors
*
horizontal_contributors
=
stbir_info
->
horizontal_contributors
;
...
...
@@ -1654,9 +1653,9 @@ static void stbir__decode_and_resample_upsample(stbir__info* stbir_info, int n)
// Now resample it into the ring buffer.
if
(
stbir__use_width_upsampling
(
stbir_info
))
stbir__resample_horizontal_upsample
(
stbir_info
,
n
,
stbir__add_empty_ring_buffer_entry
(
stbir_info
,
n
));
stbir__resample_horizontal_upsample
(
stbir_info
,
stbir__add_empty_ring_buffer_entry
(
stbir_info
,
n
));
else
stbir__resample_horizontal_downsample
(
stbir_info
,
n
,
stbir__add_empty_ring_buffer_entry
(
stbir_info
,
n
));
stbir__resample_horizontal_downsample
(
stbir_info
,
stbir__add_empty_ring_buffer_entry
(
stbir_info
,
n
));
// Now it's sitting in the ring buffer ready to be used as source for the vertical sampling.
}
...
...
@@ -1670,9 +1669,9 @@ static void stbir__decode_and_resample_downsample(stbir__info* stbir_info, int n
// Now resample it into the horizontal buffer.
if
(
stbir__use_width_upsampling
(
stbir_info
))
stbir__resample_horizontal_upsample
(
stbir_info
,
n
,
stbir_info
->
horizontal_buffer
);
stbir__resample_horizontal_upsample
(
stbir_info
,
stbir_info
->
horizontal_buffer
);
else
stbir__resample_horizontal_downsample
(
stbir_info
,
n
,
stbir_info
->
horizontal_buffer
);
stbir__resample_horizontal_downsample
(
stbir_info
,
stbir_info
->
horizontal_buffer
);
// Now it's sitting in the horizontal buffer ready to be distributed into the ring buffers.
}
...
...
@@ -1715,19 +1714,23 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
// build a table of all channels that need colorspace correction, so
// we don't perform colorspace correction on channels that don't need it.
for
(
x
=
0
,
num_nonalpha
=
0
;
x
<
channels
;
++
x
)
for
(
x
=
0
,
num_nonalpha
=
0
;
x
<
channels
;
++
x
)
{
if
(
x
!=
alpha_channel
||
(
stbir_info
->
flags
&
STBIR_FLAG_ALPHA_USES_COLORSPACE
))
nonalpha
[
num_nonalpha
++
]
=
x
;
{
nonalpha
[
num_nonalpha
++
]
=
(
stbir_uint16
)
x
;
}
}
#define STBIR__ROUND_INT(f) ((int) ((f)+0.5))
#define STBIR__ROUND_UINT(f) ((stbir_uint32) ((f)+0.5))
#ifdef STBIR__SATURATE_INT
#define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f) *
255
))
#define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f) *
65535
))
#define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f) *
stbir__max_uint8_as_float
))
#define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f) *
stbir__max_uint16_as_float
))
#else
#define STBIR__ENCODE_LINEAR8(f) (unsigned char ) STBIR__ROUND_INT(stbir__saturate(f) *
255
)
#define STBIR__ENCODE_LINEAR16(f) (unsigned short) STBIR__ROUND_INT(stbir__saturate(f) *
65535
)
#define STBIR__ENCODE_LINEAR8(f) (unsigned char ) STBIR__ROUND_INT(stbir__saturate(f) *
stbir__max_uint8_as_float
)
#define STBIR__ENCODE_LINEAR16(f) (unsigned short) STBIR__ROUND_INT(stbir__saturate(f) *
stbir__max_uint16_as_float
)
#endif
switch
(
decode
)
...
...
@@ -1782,7 +1785,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for
(
n
=
0
;
n
<
num_nonalpha
;
n
++
)
{
int
index
=
pixel_index
+
nonalpha
[
n
];
((
unsigned
short
*
)
output_buffer
)[
index
]
=
(
unsigned
short
)
STBIR__ROUND_INT
(
stbir__linear_to_srgb
(
stbir__saturate
(
encode_buffer
[
index
]))
*
65535
);
((
unsigned
short
*
)
output_buffer
)[
index
]
=
(
unsigned
short
)
STBIR__ROUND_INT
(
stbir__linear_to_srgb
(
stbir__saturate
(
encode_buffer
[
index
]))
*
stbir__max_uint16_as_float
);
}
if
(
!
(
stbir_info
->
flags
&
STBIR_FLAG_ALPHA_USES_COLORSPACE
))
...
...
@@ -1799,7 +1802,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for
(
n
=
0
;
n
<
channels
;
n
++
)
{
int
index
=
pixel_index
+
n
;
((
unsigned
int
*
)
output_buffer
)[
index
]
=
(
unsigned
int
)
STBIR__ROUND_UINT
(((
double
)
stbir__saturate
(
encode_buffer
[
index
]))
*
4294967295
);
((
unsigned
int
*
)
output_buffer
)[
index
]
=
(
unsigned
int
)
STBIR__ROUND_UINT
(((
double
)
stbir__saturate
(
encode_buffer
[
index
]))
*
stbir__max_uint32_as_float
);
}
}
break
;
...
...
@@ -1812,11 +1815,11 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
for
(
n
=
0
;
n
<
num_nonalpha
;
n
++
)
{
int
index
=
pixel_index
+
nonalpha
[
n
];
((
unsigned
int
*
)
output_buffer
)[
index
]
=
(
unsigned
int
)
STBIR__ROUND_UINT
(((
double
)
stbir__linear_to_srgb
(
stbir__saturate
(
encode_buffer
[
index
])))
*
4294967295
);
((
unsigned
int
*
)
output_buffer
)[
index
]
=
(
unsigned
int
)
STBIR__ROUND_UINT
(((
double
)
stbir__linear_to_srgb
(
stbir__saturate
(
encode_buffer
[
index
])))
*
stbir__max_uint32_as_float
);
}
if
(
!
(
stbir_info
->
flags
&
STBIR_FLAG_ALPHA_USES_COLORSPACE
))
((
unsigned
int
*
)
output_buffer
)[
pixel_index
+
alpha_channel
]
=
(
unsigned
int
)
STBIR__ROUND_INT
(((
double
)
stbir__saturate
(
encode_buffer
[
pixel_index
+
alpha_channel
]))
*
4294967295
);
((
unsigned
int
*
)
output_buffer
)[
pixel_index
+
alpha_channel
]
=
(
unsigned
int
)
STBIR__ROUND_INT
(((
double
)
stbir__saturate
(
encode_buffer
[
pixel_index
+
alpha_channel
]))
*
stbir__max_uint32_as_float
);
}
break
;
...
...
@@ -1855,7 +1858,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void
}
}
static
void
stbir__resample_vertical_upsample
(
stbir__info
*
stbir_info
,
int
n
,
int
in_first_scanline
,
int
in_last_scanline
,
float
in_center_of_out
)
static
void
stbir__resample_vertical_upsample
(
stbir__info
*
stbir_info
,
int
n
)
{
int
x
,
k
;
int
output_w
=
stbir_info
->
output_w
;
...
...
@@ -1876,7 +1879,6 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in
float
*
ring_buffer
=
stbir_info
->
ring_buffer
;
int
ring_buffer_begin_index
=
stbir_info
->
ring_buffer_begin_index
;
int
ring_buffer_first_scanline
=
stbir_info
->
ring_buffer_first_scanline
;
int
ring_buffer_last_scanline
=
stbir_info
->
ring_buffer_last_scanline
;
int
ring_buffer_length
=
stbir_info
->
ring_buffer_length_bytes
/
sizeof
(
float
);
int
n0
,
n1
,
output_row_start
;
...
...
@@ -1973,16 +1975,14 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in
stbir__encode_scanline
(
stbir_info
,
output_w
,
(
char
*
)
output_data
+
output_row_start
,
encode_buffer
,
channels
,
alpha_channel
,
decode
);
}
static
void
stbir__resample_vertical_downsample
(
stbir__info
*
stbir_info
,
int
n
,
int
in_first_scanline
,
int
in_last_scanline
,
float
in_center_of_out
)
static
void
stbir__resample_vertical_downsample
(
stbir__info
*
stbir_info
,
int
n
)
{
int
x
,
k
;
int
output_w
=
stbir_info
->
output_w
;
int
output_h
=
stbir_info
->
output_h
;
stbir__contributors
*
vertical_contributors
=
stbir_info
->
vertical_contributors
;
float
*
vertical_coefficients
=
stbir_info
->
vertical_coefficients
;
int
channels
=
stbir_info
->
channels
;
int
ring_buffer_entries
=
stbir_info
->
ring_buffer_num_entries
;
void
*
output_data
=
stbir_info
->
output_data
;
float
*
horizontal_buffer
=
stbir_info
->
horizontal_buffer
;
int
coefficient_width
=
stbir_info
->
vertical_coefficient_width
;
int
contributor
=
n
+
stbir_info
->
vertical_filter_pixel_margin
;
...
...
@@ -1990,7 +1990,6 @@ static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n,
float
*
ring_buffer
=
stbir_info
->
ring_buffer
;
int
ring_buffer_begin_index
=
stbir_info
->
ring_buffer_begin_index
;
int
ring_buffer_first_scanline
=
stbir_info
->
ring_buffer_first_scanline
;
int
ring_buffer_last_scanline
=
stbir_info
->
ring_buffer_last_scanline
;
int
ring_buffer_length
=
stbir_info
->
ring_buffer_length_bytes
/
sizeof
(
float
);
int
n0
,
n1
;
...
...
@@ -2103,7 +2102,7 @@ static void stbir__buffer_loop_upsample(stbir__info* stbir_info)
stbir__decode_and_resample_upsample
(
stbir_info
,
stbir_info
->
ring_buffer_last_scanline
+
1
);
// Now all buffers should be ready to write a row of vertical sampling.
stbir__resample_vertical_upsample
(
stbir_info
,
y
,
in_first_scanline
,
in_last_scanline
,
in_center_of_out
);
stbir__resample_vertical_upsample
(
stbir_info
,
y
);
STBIR_PROGRESS_REPORT
((
float
)
y
/
stbir_info
->
output_h
);
}
...
...
@@ -2189,7 +2188,7 @@ static void stbir__buffer_loop_downsample(stbir__info* stbir_info)
stbir__add_empty_ring_buffer_entry
(
stbir_info
,
stbir_info
->
ring_buffer_last_scanline
+
1
);
// Now the horizontal buffer is ready to write to all ring buffer rows.
stbir__resample_vertical_downsample
(
stbir_info
,
y
,
out_first_scanline
,
out_last_scanline
,
out_center_of_in
);
stbir__resample_vertical_downsample
(
stbir_info
,
y
);
}
stbir__empty_ring_buffer
(
stbir_info
,
stbir_info
->
output_h
);
...
...
@@ -2393,8 +2392,8 @@ static int stbir__resize_allocated(stbir__info *info,
// This signals that the ring buffer is empty
info
->
ring_buffer_begin_index
=
-
1
;
stbir__calculate_filters
(
info
,
info
->
horizontal_contributors
,
info
->
horizontal_coefficients
,
info
->
horizontal_filter
,
info
->
horizontal_scale
,
info
->
horizontal_shift
,
info
->
input_w
,
info
->
output_w
);
stbir__calculate_filters
(
info
,
info
->
vertical_contributors
,
info
->
vertical_coefficients
,
info
->
vertical_filter
,
info
->
vertical_scale
,
info
->
vertical_shift
,
info
->
input_h
,
info
->
output_h
);
stbir__calculate_filters
(
info
->
horizontal_contributors
,
info
->
horizontal_coefficients
,
info
->
horizontal_filter
,
info
->
horizontal_scale
,
info
->
horizontal_shift
,
info
->
input_w
,
info
->
output_w
);
stbir__calculate_filters
(
info
->
vertical_contributors
,
info
->
vertical_coefficients
,
info
->
vertical_filter
,
info
->
vertical_scale
,
info
->
vertical_shift
,
info
->
input_h
,
info
->
output_h
);
STBIR_PROGRESS_REPORT
(
0
);
...
...
tests/resample_test.cpp
浏览文件 @
2549ffcd
...
...
@@ -70,9 +70,11 @@ void stbir_progress(float p)
#ifdef _WIN32
#include <sys/timeb.h>
#endif
#include <direct.h>
#define mkdir(a, b) _mkdir(a)
#else
#include <sys/stat.h>
#endif
#define MT_SIZE 624
static
size_t
g_aiMT
[
MT_SIZE
];
...
...
@@ -833,7 +835,7 @@ void test_filters(void)
#define UMAX32 4294967295U
static
void
write32
(
char
*
filename
,
stbir_uint32
*
output
,
int
w
,
int
h
)
static
void
write32
(
c
onst
c
har
*
filename
,
stbir_uint32
*
output
,
int
w
,
int
h
)
{
stbir_uint8
*
data
=
(
stbir_uint8
*
)
malloc
(
w
*
h
*
3
);
for
(
int
i
=
0
;
i
<
w
*
h
*
3
;
++
i
)
...
...
@@ -869,9 +871,9 @@ static void test_32(void)
void
test_suite
(
int
argc
,
char
**
argv
)
{
int
i
;
char
*
barbara
;
c
onst
c
har
*
barbara
;
_mkdir
(
"test-output"
);
mkdir
(
"test-output"
,
777
);
if
(
argc
>
1
)
barbara
=
argv
[
1
];
...
...
tests/resample_test_c.c
浏览文件 @
2549ffcd
...
...
@@ -3,3 +3,6 @@
#include "stb_image_resize.h"
// Just to make sure it will build properly with a c compiler
int
main
()
{
}
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