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const
png
=
require
(
'./png/node.js'
)
;
const
mem
=
require
(
'./utils/mem.js'
)
;
const
{
version
}
=
require
(
'./package.json'
)
;
const
codecs
=
require
(
'./codecs/node/index.js'
)
;
const
{
default
:
v2
}
=
require
(
'./v2/framebuffer.js'
)
;
// old
const
svglib
=
require
(
'./wasm/node/svg.js'
)
;
const
giflib
=
require
(
'./wasm/node/gif.js'
)
;
const
pnglib
=
require
(
'./wasm/node/png.js'
)
;
const
fontlib
=
require
(
'./wasm/node/font.js'
)
;
const
jpeglib
=
require
(
'./wasm/node/jpeg.js'
)
;
const
tifflib
=
require
(
'./wasm/node/tiff.js'
)
;
const
MAGIC_NUMBERS
=
{
PNG
:
0x89504e47
,
JPEG
:
0xffd8ff
,
TIFF
:
0x49492a00
,
GIF
:
0x474946
}
;
/**
* Represents an image; provides utility functions
*/
class
Image
{
/**
* Creates a new image with the given dimensions
*
@param
{
number
} width
*
@param
{
number
} height
*
@returns
{
Image
}
*/
constructor
(
width
,
height
)
{
width
=
~
~
width
;
height
=
~
~
height
;
if
(
width
<
1
)
throw
new
RangeError
(
'Image has to be at least 1 pixel wide'
)
;
if
(
height
<
1
)
throw
new
RangeError
(
'Image has to be at least 1 pixel high'
)
;
/**
@private
*/
this
.
__width__
=
width
;
/**
@private
*/
this
.
__height__
=
height
;
/**
@private
*/
this
.
__buffer__
=
new
ArrayBuffer
(
width
*
height
*
4
)
;
/**
@private
*/
this
.
__view__
=
new
DataView
(
this
.
__buffer__
)
;
/**
@private
*/
this
.
__u32__
=
new
Uint32Array
(
this
.
__buffer__
)
;
/**
* The images RGBA pixel data
*
@type
{
Uint8ClampedArray
}
*/
this
.
bitmap
=
new
Uint8ClampedArray
(
this
.
__buffer__
)
;
}
/**
*
@private
*
@returns
{
string
}
*/
toString
(
)
{
return
`Image<
${
this
.
width
}
x
${
this
.
height
}
>`
;
}
/**
* The images width
*
@returns
{
number
}
*/
get
width
(
)
{
return
this
.
__width__
;
}
/**
* The images height
*
@returns
{
number
}
*/
get
height
(
)
{
return
this
.
__height__
;
}
/**
* Yields an [x, y] array for every pixel in the image
*
@yields
{number[]} The coordinates of the pixel ([x, y])
*
@returns
{
void
}
*/
*
[
Symbol
.
iterator
]
(
)
{
for
(
const
x
of
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
[
Symbol
.
iterator
]
(
)
)
yield
(
x
[
0
]
++
,
x
[
1
]
++
,
x
)
}
/**
* Yields an [x, y, color] array for every pixel in the image
*
@yields
{number[]} The coordinates and color of the pixel ([x, y, color])
*/
*
iterateWithColors
(
)
{
for
(
const
x
of
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
pixels
(
'int'
)
)
yield
(
x
[
0
]
++
,
x
[
1
]
++
,
x
)
;
}
/**
* Converts RGBA components to an RGBA value
*
@param
{
number
} r red (0..255)
*
@param
{
number
} g green (0..255)
*
@param
{
number
} b blue (0..255)
*
@param
{
number
} a alpha (0..255)
*
@returns
{
number
} RGBA value
*/
static
rgbaToColor
(
r
,
g
,
b
,
a
)
{
return
(
(
(
r
&
0xff
)
<<
24
)
|
(
(
g
&
0xff
)
<<
16
)
|
(
(
b
&
0xff
)
<<
8
)
|
(
a
&
0xff
)
)
>>>
0
;
}
/**
* Converts RGB components to an RGBA value (assuming alpha = 255)
*
@param
{
number
} r red (0..255)
*
@param
{
number
} g green (0..255)
*
@param
{
number
} b blue (0..255)
*
@returns
{
number
} RGBA value
*/
static
rgbToColor
(
r
,
g
,
b
)
{
return
Image
.
rgbaToColor
(
r
,
g
,
b
,
0xff
)
;
}
/**
* Converts HSLA colors to RGBA colors
*
@param
{
number
} h hue (0..1)
*
@param
{
number
} s saturation (0..1)
*
@param
{
number
} l lightness (0..1)
*
@param
{
number
} a opacity (0..1)
*
@returns
{
number
} color
*/
static
hslaToColor
(
h
,
s
,
l
,
a
)
{
h
%=
1
;
s
=
Math
.
min
(
1
,
Math
.
max
(
0
,
s
)
)
;
l
=
Math
.
min
(
1
,
Math
.
max
(
0
,
l
)
)
;
a
=
Math
.
min
(
1
,
Math
.
max
(
0
,
a
)
)
;
let
r
,
g
,
b
;
if
(
s
===
0
)
{
r
=
g
=
b
=
l
;
}
else
{
const
hue2rgb
=
(
p
,
q
,
t
)
=>
{
if
(
t
<
0
)
t
+=
1
;
if
(
t
>
1
)
t
-=
1
;
if
(
t
<
1
/
6
)
return
p
+
(
q
-
p
)
*
6
*
t
;
if
(
t
<
1
/
2
)
return
q
;
if
(
t
<
2
/
3
)
return
p
+
(
q
-
p
)
*
(
2
/
3
-
t
)
*
6
;
return
p
;
}
;
const
q
=
l
<
0.5
?
l
*
(
1
+
s
)
:
l
+
s
-
l
*
s
;
const
p
=
2
*
l
-
q
;
r
=
hue2rgb
(
p
,
q
,
h
+
1
/
3
)
;
g
=
hue2rgb
(
p
,
q
,
h
)
;
b
=
hue2rgb
(
p
,
q
,
h
-
1
/
3
)
;
}
return
Image
.
rgbaToColor
(
r
*
255
,
g
*
255
,
b
*
255
,
a
*
255
)
;
}
/**
* Converts HSL colors to RGBA colors (assuming an opacity of 255)
*
@param
{
number
} h hue (0..1)
*
@param
{
number
} s saturation (0..1)
*
@param
{
number
} l lightness (0..1)
*
@returns
{
number
} color
*/
static
hslToColor
(
h
,
s
,
l
)
{
return
Image
.
hslaToColor
(
h
,
s
,
l
,
1
)
;
}
/**
* Converts an RGBA value to an array of HSLA values
*
@param
r {number} (0..255)
*
@param
g {number} (0..255)
*
@param
b {number} (0..255)
*
@param
a {number} (0..255)
*
@returns
{
number[]
} The HSLA values ([H, S, L, A])
*/
static
rgbaToHSLA
(
r
,
g
,
b
,
a
)
{
r
/=
255
;
g
/=
255
;
b
/=
255
;
const
max
=
Math
.
max
(
r
,
g
,
b
)
,
min
=
Math
.
min
(
r
,
g
,
b
)
;
let
h
,
s
,
l
=
(
max
+
min
)
/
2
;
if
(
max
===
min
)
{
h
=
s
=
0
;
}
else
{
const
d
=
max
-
min
;
s
=
l
>
0.5
?
d
/
(
2
-
max
-
min
)
:
d
/
(
max
+
min
)
;
switch
(
max
)
{
case
r
:
h
=
(
g
-
b
)
/
d
+
(
g
<
b
?
6
:
0
)
;
break
;
case
g
:
h
=
(
b
-
r
)
/
d
+
2
;
break
;
case
b
:
h
=
(
r
-
g
)
/
d
+
4
;
break
;
}
h
/=
6
;
}
return
[
h
,
s
,
l
,
a
/
255
]
;
}
/**
* Converts a color value to an array of RGBA values
*
@param
{
number
} color The color value to convert
*
@returns
{
number[]
} The RGBA values ([R, G, B, A])
*/
static
colorToRGBA
(
color
)
{
return
[
(
color
>>
24
)
&
0xff
,
(
color
>>
16
)
&
0xff
,
(
color
>>
8
)
&
0xff
,
color
&
0xff
]
;
}
/**
* Converts a color value to an array of RGB values (ignoring the colors alpha)
*
@param
{
number
} color The color value to convert
*
@returns
{
number[]
} The RGB values ([R, G, B])
*/
static
colorToRGB
(
color
)
{
return
Image
.
colorToRGBA
(
color
)
.
slice
(
0
,
3
)
;
}
/**
* Gets the pixel color at the specified position
*
@param
{
number
} x
*
@param
{
number
} y
*
@returns
{
number
} The color value
*/
getPixelAt
(
x
,
y
)
{
this
.
__check_boundaries__
(
x
,
y
)
;
return
this
.
__view__
.
getUint32
(
(
(
~
~
y
-
1
)
*
this
.
width
+
(
~
~
x
-
1
)
)
*
4
,
false
)
;
}
/**
* Gets the pixel color at the specified position
*
@param
{
number
} x
*
@param
{
number
} y
*
@returns
{
Uint8ClampedArray
} The RGBA value
*/
getRGBAAt
(
x
,
y
)
{
this
.
__check_boundaries__
(
x
,
y
)
;
const
idx
=
(
(
~
~
y
-
1
)
*
this
.
width
+
(
~
~
x
-
1
)
)
*
4
;
return
this
.
bitmap
.
subarray
(
idx
,
idx
+
4
)
;
}
/**
* Sets the pixel color for the specified position
*
@param
{
number
} x
*
@param
{
number
} y
*
@param
{
number
} pixelColor
*/
setPixelAt
(
x
,
y
,
pixelColor
)
{
x
=
~
~
x
;
y
=
~
~
y
;
this
.
__check_boundaries__
(
x
,
y
)
;
this
.
__set_pixel__
(
x
,
y
,
pixelColor
)
;
return
this
;
}
/**
*
@private
*
@param
{
number
} x
*
@param
{
number
} y
*
@param
{
number
} pixelColor
*/
__set_pixel__
(
x
,
y
,
pixelColor
)
{
this
.
__view__
.
setUint32
(
(
(
y
-
1
)
*
this
.
width
+
(
x
-
1
)
)
*
4
,
pixelColor
,
false
)
;
}
/**
*
@private
*
@param
{
number
} x
*
@param
{
number
} y
*/
__check_boundaries__
(
x
,
y
)
{
if
(
isNaN
(
x
)
)
throw
new
TypeError
(
`Invalid pixel coordinates (x=
${
x
}
)`
)
;
if
(
isNaN
(
y
)
)
throw
new
TypeError
(
`Invalid pixel coordinates (y=
${
y
}
)`
)
;
if
(
x
<
1
)
throw
new
RangeError
(
`
${
Image
.
__out_of_bounds__
}
(x=
${
x
}
)<1`
)
;
if
(
x
>
this
.
width
)
throw
new
RangeError
(
`
${
Image
.
__out_of_bounds__
}
(x=
${
x
}
)>(width=
${
this
.
width
}
)`
)
;
if
(
y
<
1
)
throw
new
RangeError
(
`
${
Image
.
__out_of_bounds__
}
(y=
${
y
}
)<1`
)
;
if
(
y
>
this
.
height
)
throw
new
RangeError
(
`
${
Image
.
__out_of_bounds__
}
(y=
${
y
}
)>(height=
${
this
.
height
}
)`
)
;
}
/**
*
@private
*/
static
get
__out_of_bounds__
(
)
{
return
'Tried referencing a pixel outside of the images boundaries:'
;
}
/**
*
@callback
colorFunction
*
@param
{
number
} x
*
@param
{
number
} y
*
@returns
{
number
} pixel color
*/
/**
* Fills the image data with the supplied color
*
@param
{
number|colorFunction
} color
*
@returns
{
Image
}
*/
fill
(
color
)
{
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
fill
(
color
)
;
return
this
;
}
/**
* Clones the current image
*
@returns
{
Image
}
*/
clone
(
)
{
const
image
=
new
Image
(
this
.
width
,
this
.
height
)
;
image
.
bitmap
.
set
(
this
.
bitmap
)
;
return
image
;
}
/**
* Use {
@link
https://en.wikipedia.org/wiki/Image_scaling#Nearest-neighbor_interpolation Nearest-neighbor} resizing.
*
@returns
{
string
}
*/
static
get
RESIZE_NEAREST_NEIGHBOR
(
)
{
return
'RESIZE_NEAREST_NEIGHBOR'
;
}
/**
* Used for automatically preserving an images aspect ratio when resizing.
*
@returns
{
number
}
*/
static
get
RESIZE_AUTO
(
)
{
return
-
1
;
}
/**
* Resizes the image by the given factor
*
@param
{
number
} factor The factor to resize the image with
*
@param
{
string
} [mode=Image.RESIZE_NEAREST_NEIGHBOR] The resizing mode to use
*
@returns
{
Image
}
*/
scale
(
factor
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
const
image
=
this
.
__scale__
(
factor
,
mode
)
;
return
this
.
__apply__
(
image
)
;
}
/**
@private
*/
__scale__
(
factor
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
if
(
factor
===
1
)
return
this
;
return
this
.
__resize__
(
this
.
width
*
factor
,
this
.
height
*
factor
,
mode
)
;
}
/**
* Resizes the image to the given dimensions.
* Use {
@link
Image.RESIZE_AUTO} as either width or height to automatically preserve the aspect ratio.
*
@param
{
number
} width The new width
*
@param
{
number
} height The new height
*
@param
{
string
} [mode=Image.RESIZE_NEAREST_NEIGHBOR] The resizing mode to use
*
@returns
{
Image
} The resized image
*/
resize
(
width
,
height
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
const
image
=
this
.
__resize__
(
width
,
height
,
mode
)
;
return
this
.
__apply__
(
image
)
;
}
/**
* Resizes the image so it is contained in the given bounding box.
* Can return an image with one axis smaller than the given bounding box.
*
@param
{
number
} width The width of the bounding box
*
@param
{
number
} height The height of the bounding box
*
@param
{
string
} [mode=Image.RESIZE_NEAREST_NEIGHBOR] The resizing mode to use
*
@returns
{
Image
} The resized image
*/
contain
(
width
,
height
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
const
scaleFactor
=
width
/
height
>
this
.
width
/
this
.
height
?
height
/
this
.
height
:
width
/
this
.
width
;
return
this
.
scale
(
scaleFactor
,
mode
)
;
}
/**
* Resizes the image so it is contained in the given bounding box, placing it in the center of the given bounding box.
* Always returns the exact dimensions of the bounding box.
*
@param
{
number
} width The width of the bounding box
*
@param
{
number
} height The height of the bounding box
*
@param
{
string
} [mode=Image.RESIZE_NEAREST_NEIGHBOR] The resizing mode to use
*
@returns
{
Image
} The resized image
*/
fit
(
width
,
height
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
const
result
=
new
Image
(
width
,
height
)
;
this
.
contain
(
width
,
height
,
mode
)
;
result
.
composite
(
this
,
(
width
-
this
.
width
)
/
2
,
(
height
-
this
.
height
)
/
2
)
;
return
this
.
__apply__
(
result
)
;
}
/**
* Resizes the image so it covers the given bounding box, cropping the overflowing edges.
* Always returns the exact dimensions of the bounding box.
*
@param
{
number
} width The width of the bounding box
*
@param
{
number
} height The height of the bounding box
*
@param
{
string
} [mode=Image.RESIZE_NEAREST_NEIGHBOR] The resizing mode to use
*
@returns
{
Image
} The resized image
*/
cover
(
width
,
height
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
const
scaleFactor
=
width
/
height
>
this
.
width
/
this
.
height
?
width
/
this
.
width
:
height
/
this
.
height
;
const
result
=
this
.
scale
(
scaleFactor
,
mode
)
;
return
result
.
crop
(
(
result
.
width
-
width
)
/
2
,
(
result
.
height
-
height
)
/
2
,
width
,
height
)
;
}
/**
@private
*/
__resize__
(
width
,
height
,
mode
=
Image
.
RESIZE_NEAREST_NEIGHBOR
)
{
if
(
width
===
Image
.
RESIZE_AUTO
&&
height
===
Image
.
RESIZE_AUTO
)
throw
new
Error
(
'RESIZE_AUTO can only be used for either width or height, not for both'
)
;
else
if
(
width
===
Image
.
RESIZE_AUTO
)
width
=
this
.
width
/
this
.
height
*
height
;
else
if
(
height
===
Image
.
RESIZE_AUTO
)
height
=
this
.
height
/
this
.
width
*
width
;
width
=
Math
.
floor
(
width
)
;
height
=
Math
.
floor
(
height
)
;
if
(
width
<
1
)
throw
new
RangeError
(
'Image has to be at least 1 pixel wide'
)
;
if
(
height
<
1
)
throw
new
RangeError
(
'Image has to be at least 1 pixel high'
)
;
let
image
;
if
(
mode
===
Image
.
RESIZE_NEAREST_NEIGHBOR
)
image
=
this
.
__resize_nearest_neighbor__
(
width
,
height
)
;
else
throw
new
Error
(
'Invalid resize mode'
)
;
return
image
;
}
/**
*
@private
*
@param
{
number
} width The new width
*
@param
{
number
} height The new height
*/
__resize_nearest_neighbor__
(
width
,
height
)
{
const
image
=
new
this
.
constructor
(
width
,
height
)
;
const
frame
=
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
resize
(
'nearest'
,
width
,
height
)
;
image
.
bitmap
.
set
(
frame
.
u8
)
;
return
image
;
}
/**
* Crops an image to the specified dimensions
*
@param
{
number
} x The x offset
*
@param
{
number
} y The y offset
*
@param
{
number
} width The new images width
*
@param
{
number
} height The new images height
*
@returns
{
Image
}
*/
crop
(
x
,
y
,
width
,
height
)
{
if
(
width
>
this
.
width
)
width
=
this
.
width
;
if
(
height
>
this
.
height
)
height
=
this
.
height
;
return
this
.
__apply__
(
this
.
__crop__
(
~
~
x
,
~
~
y
,
~
~
width
,
~
~
height
)
)
;
}
/**
*
@param
{
number
} x
*
@param
{
number
} y
*
@param
{
number
} width
*
@param
{
number
} height
*
@returns
{
Image
}
*
@private
*/
__crop__
(
x
,
y
,
width
,
height
)
{
x
=
~
~
x
;
y
=
~
~
y
;
const
image
=
new
this
.
constructor
(
width
,
height
)
;
for
(
let
tY
=
0
;
tY
<
height
;
tY
++
)
{
const
idx
=
(
tY
+
y
)
*
this
.
width
+
x
;
image
.
__u32__
.
set
(
this
.
__u32__
.
subarray
(
idx
,
idx
+
width
)
,
tY
*
width
)
;
}
return
image
;
}
/**
* Draws a box at the specified coordinates
*
@param
{
number
} x The x offset
*
@param
{
number
} y The y offset
*
@param
{
number
} width The box width
*
@param
{
number
} height The box height
*
@param
{
number|colorFunction
} color The color to fill the box in with
*
@returns
{
Image
}
*/
drawBox
(
x
,
y
,
width
,
height
,
color
)
{
x
=
~
~
(
x
-
1
)
;
y
=
~
~
(
y
-
1
)
;
width
=
~
~
width
;
height
=
~
~
height
;
if
(
typeof
color
===
'function'
)
{
for
(
let
tY
=
1
;
tY
<=
height
;
tY
++
)
{
for
(
let
tX
=
1
;
tX
<=
width
;
tX
++
)
{
const
nX
=
tX
+
x
;
const
nY
=
tY
+
y
;
if
(
Math
.
min
(
nX
,
nY
)
<
1
||
nX
>
this
.
width
||
nY
>
this
.
height
)
continue
;
const
tC
=
color
(
tX
,
tY
)
;
this
.
__set_pixel__
(
nX
,
nY
,
tC
)
;
}
}
}
else
return
this
.
__fast_box__
(
x
,
y
,
width
,
height
,
color
)
;
return
this
;
}
/**
*
@private
*
@param
{
number
} x
*
@param
{
number
} y
*
@param
{
number
} width
*
@param
{
number
} height
*
@param
{
number
} color
*/
__fast_box__
(
x
,
y
,
width
,
height
,
color
)
{
if
(
x
<
0
)
{
width
+=
x
;
x
=
0
;
}
if
(
y
<
0
)
{
height
+=
y
;
y
=
0
;
}
const
right
=
Math
.
max
(
Math
.
min
(
x
+
width
,
this
.
width
)
,
1
)
;
let
xPos
=
right
;
while
(
x
<=
--
xPos
)
this
.
__view__
.
setUint32
(
4
*
(
xPos
+
y
*
this
.
width
)
,
color
)
;
const
end
=
4
*
(
right
+
y
*
this
.
width
)
;
const
start
=
4
*
(
x
+
y
*
this
.
width
)
;
let
bottom
=
Math
.
max
(
Math
.
min
(
y
+
height
,
this
.
height
)
,
1
)
;
while
(
y
<
--
bottom
)
this
.
bitmap
.
copyWithin
(
4
*
(
x
+
bottom
*
this
.
width
)
,
start
,
end
)
;
return
this
;
}
/**
* Draws a circle at the specified coordinates with the specified radius
*
@param
{
number
} x The center x position
*
@param
{
number
} y The center y position
*
@param
{
number
} radius The circles radius
*
@param
{
number|colorFunction
} color
*
@returns
{
Image
}
*/
drawCircle
(
x
,
y
,
radius
,
color
)
{
const
radSquared
=
radius
**
2
;
for
(
let
currentY
=
Math
.
max
(
1
,
y
-
radius
)
;
currentY
<=
Math
.
min
(
y
+
radius
,
this
.
height
)
;
currentY
++
)
{
for
(
let
currentX
=
Math
.
max
(
1
,
x
-
radius
)
;
currentX
<=
Math
.
min
(
x
+
radius
,
this
.
width
)
;
currentX
++
)
{
if
(
(
currentX
-
x
)
**
2
+
(
currentY
-
y
)
**
2
<
radSquared
)
this
.
__set_pixel__
(
currentX
,
currentY
,
typeof
color
===
'function'
?
color
(
currentX
-
x
+
radius
,
currentY
-
y
+
radius
)
:
color
)
;
}
}
return
this
;
}
/**
* Crops the image into a circle
*
@param
{
boolean
} [max=false] Whether to use the larger dimension for the size
*
@param
{
number
} [feathering=0] How much feathering to apply to the edges
*
@returns
{
Image
}
*/
cropCircle
(
max
=
false
,
feathering
=
0
)
{
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
crop
(
'circle'
,
feathering
)
;
return
this
;
}
/**
* Sets the images opacity
*
@param
{
number
} opacity The opacity to apply (0..1)
*
@param
{
boolean
} absolute Whether to scale the current opacity (false) or just set the new opacity (true)
*
@returns
{
Image
}
*/
opacity
(
opacity
,
absolute
=
false
)
{
if
(
isNaN
(
opacity
)
||
opacity
<
0
)
throw
new
RangeError
(
'Invalid opacity value'
)
;
this
.
__set_channel_value__
(
opacity
,
absolute
,
3
)
;
return
this
;
}
/**
* Sets the red channels saturation
*
@param
{
number
} saturation The saturation to apply (0..1)
*
@param
{
boolean
} absolute Whether to scale the current saturation (false) or just set the new saturation (true)
*
@returns
{
Image
}
*/
red
(
saturation
,
absolute
=
false
)
{
if
(
isNaN
(
saturation
)
||
saturation
<
0
)
throw
new
RangeError
(
'Invalid saturation value'
)
;
this
.
__set_channel_value__
(
saturation
,
absolute
,
0
)
;
return
this
;
}
/**
* Sets the green channels saturation
*
@param
{
number
} saturation The saturation to apply (0..1)
*
@param
{
boolean
} absolute Whether to scale the current saturation (false) or just set the new saturation (true)
*
@returns
{
Image
}
*/
green
(
saturation
,
absolute
=
false
)
{
if
(
isNaN
(
saturation
)
||
saturation
<
0
)
throw
new
RangeError
(
'Invalid saturation value'
)
;
this
.
__set_channel_value__
(
saturation
,
absolute
,
1
)
;
return
this
;
}
/**
* Sets the blue channels saturation
*
@param
{
number
} saturation The saturation to apply (0..1)
*
@param
{
boolean
} absolute Whether to scale the current saturation (false) or just set the new saturation (true)
*
@returns
{
Image
}
*/
blue
(
saturation
,
absolute
=
false
)
{
if
(
isNaN
(
saturation
)
||
saturation
<
0
)
throw
new
RangeError
(
'Invalid saturation value'
)
;
this
.
__set_channel_value__
(
saturation
,
absolute
,
2
)
;
return
this
;
}
/**
*
@private
*
@param
{
number
} value
*
@param
{
boolean
} absolute
*
@param
{
number
} offset
*/
__set_channel_value__
(
value
,
absolute
,
offset
)
{
for
(
let
i
=
offset
;
i
<
this
.
bitmap
.
length
;
i
+=
4
)
this
.
bitmap
[
i
]
=
value
*
(
absolute
?
255
:
this
.
bitmap
[
i
]
)
;
}
/**
* Sets the brightness of the image
*
@param
{
number
} value The lightness to apply (0..1)
*
@param
{
boolean
} absolute Whether to scale the current lightness (false) or just set the new lightness (true)
*
@returns
{
Image
}
*/
lightness
(
value
,
absolute
=
false
)
{
if
(
isNaN
(
value
)
||
value
<
0
)
throw
new
RangeError
(
'Invalid lightness value'
)
;
return
this
.
fill
(
(
x
,
y
)
=>
{
const
[
h
,
s
,
l
,
a
]
=
Image
.
rgbaToHSLA
(
...
this
.
getRGBAAt
(
x
,
y
)
)
;
return
Image
.
hslaToColor
(
h
,
s
,
value
*
(
absolute
?
1
:
l
)
,
a
)
;
}
)
;
}
/**
* Sets the saturation of the image
*
@param
{
number
} value The saturation to apply (0..1)
*
@param
{
boolean
} absolute Whether to scale the current saturation (false) or just set the new saturation (true)
*
@returns
{
Image
}
*/
saturation
(
value
,
absolute
=
false
)
{
if
(
isNaN
(
value
)
||
value
<
0
)
throw
new
RangeError
(
'Invalid saturation value'
)
;
return
this
.
fill
(
(
x
,
y
)
=>
{
const
[
h
,
s
,
l
,
a
]
=
Image
.
rgbaToHSLA
(
...
this
.
getRGBAAt
(
x
,
y
)
)
;
return
Image
.
hslaToColor
(
h
,
value
*
(
absolute
?
1
:
s
)
,
l
,
a
)
;
}
)
;
}
/**
* Composites (overlays) the source onto this image at the specified coordinates
*
@param
{
Image
} source The image to place
*
@param
{
number
} [x=0] The x position to place the image at
*
@param
{
number
} [y=0] The y position to place the image at
*
@returns
{
Image
}
*/
composite
(
source
,
x
=
0
,
y
=
0
)
{
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
overlay
(
new
v2
(
source
.
width
,
source
.
height
,
source
.
bitmap
)
,
x
,
y
)
;
return
this
;
}
/**
* Inverts the images colors
*
@returns
{
Image
}
*/
invert
(
)
{
for
(
const
[
x
,
y
,
color
]
of
this
.
iterateWithColors
(
)
)
this
.
__set_pixel__
(
x
,
y
,
(
(
0xffffffff
-
color
)
&
0xffffff00
)
|
(
color
&
0xff
)
)
;
return
this
;
}
/**
* Inverts the images value (lightness)
*
@returns
{
Image
}
*/
invertValue
(
)
{
for
(
const
[
x
,
y
,
color
]
of
this
.
iterateWithColors
(
)
)
{
const
[
h
,
s
,
l
,
a
]
=
Image
.
rgbaToHSLA
(
...
Image
.
colorToRGBA
(
color
)
)
;
this
.
__set_pixel__
(
x
,
y
,
Image
.
hslaToColor
(
h
,
s
,
1
-
l
,
a
)
)
;
}
return
this
;
}
/**
* Inverts the images saturation
*
@returns
{
Image
}
*/
invertSaturation
(
)
{
for
(
const
[
x
,
y
,
color
]
of
this
.
iterateWithColors
(
)
)
{
const
[
h
,
s
,
l
,
a
]
=
Image
.
rgbaToHSLA
(
...
Image
.
colorToRGBA
(
color
)
)
;
this
.
__set_pixel__
(
x
,
y
,
Image
.
hslaToColor
(
h
,
1
-
s
,
l
,
a
)
)
;
}
return
this
;
}
/**
* Inverts the images hue
*
@returns
{
Image
}
*/
invertHue
(
)
{
for
(
const
[
x
,
y
,
color
]
of
this
.
iterateWithColors
(
)
)
{
const
[
h
,
s
,
l
,
a
]
=
Image
.
rgbaToHSLA
(
...
Image
.
colorToRGBA
(
color
)
)
;
this
.
__set_pixel__
(
x
,
y
,
Image
.
hslaToColor
(
1
-
h
,
s
,
l
,
a
)
)
;
}
return
this
;
}
/**
* Shifts the images hue
*
@param
{
number
} degrees How many degrees to shift the hue by
*/
hueShift
(
degrees
)
{
for
(
const
[
x
,
y
,
color
]
of
this
.
iterateWithColors
(
)
)
{
const
[
h
,
s
,
l
,
a
]
=
Image
.
rgbaToHSLA
(
...
Image
.
colorToRGBA
(
color
)
)
;
this
.
__set_pixel__
(
x
,
y
,
Image
.
hslaToColor
(
h
+
degrees
/
360
,
s
,
l
,
a
)
)
;
}
return
this
;
}
/**
* Gets the average color of the image
*
@returns
{
number
}
*/
averageColor
(
)
{
let
colorAvg
=
[
0
,
0
,
0
]
;
let
divisor
=
0
;
for
(
let
idx
=
0
;
idx
<
this
.
bitmap
.
length
;
idx
+=
4
)
{
const
rgba
=
this
.
bitmap
.
subarray
(
idx
,
idx
+
4
)
;
for
(
let
i
=
0
;
i
<
3
;
i
++
)
colorAvg
[
i
]
+=
rgba
[
i
]
;
divisor
+=
rgba
[
3
]
/
255
;
}
return
Image
.
rgbaToColor
(
...
colorAvg
.
map
(
v
=>
v
/
divisor
)
,
0xff
)
;
}
/**
* Gets the images dominant color
*
@param
{
boolean
} [ignoreBlack=true] Whether to ignore dark colors below the threshold
*
@param
{
boolean
} [ignoreWhite=true] Whether to ignore light colors above the threshold
*
@param
{
number
} [bwThreshold=0xf] The black/white threshold (0-64)
*
@return
{
number
} The images dominant color
*/
dominantColor
(
ignoreBlack
=
true
,
ignoreWhite
=
true
,
bwThreshold
=
0xf
)
{
const
colorCounts
=
new
Array
(
0x3ffff
)
;
for
(
let
i
=
0
;
i
<
this
.
bitmap
.
length
;
i
+=
4
)
{
const
color
=
this
.
__view__
.
getUint32
(
i
,
false
)
;
const
[
h
,
s
,
l
]
=
Image
.
rgbaToHSLA
(
...
Image
.
colorToRGBA
(
color
)
)
.
map
(
v
=>
(
~
~
(
v
*
0x3f
)
)
)
;
if
(
ignoreBlack
&&
l
<
bwThreshold
)
continue
;
if
(
ignoreWhite
&&
l
>
0x3f
-
bwThreshold
)
continue
;
const
key
=
h
<<
12
|
s
<<
6
|
l
;
colorCounts
[
key
]
=
(
colorCounts
[
key
]
||
0
)
+
1
;
}
let
maxColorCount
=
-
1
;
let
mostProminentValue
=
0
;
colorCounts
.
forEach
(
(
el
,
i
)
=>
{
if
(
el
<
maxColorCount
)
return
;
maxColorCount
=
el
;
mostProminentValue
=
i
;
}
)
;
if
(
mostProminentValue
===
-
1
)
return
this
.
dominantColor
(
ignoreBlack
,
ignoreWhite
,
bwThreshold
-
1
)
;
const
h
=
(
mostProminentValue
>>>
12
)
&
0x3f
;
const
s
=
(
mostProminentValue
>>>
6
)
&
0x3f
;
const
l
=
mostProminentValue
&
0x3f
;
return
Image
.
hslaToColor
(
h
/
0x3f
,
s
/
0x3f
,
l
/
0x3f
,
1
)
;
}
/**
* Rotates the image the given amount of degrees
*
@param
{
number
} angle The angle to rotate the image for (in degrees)
*
@param
{
boolean
} resize Whether to resize the image so it fits all pixels or just ignore outlying pixels
*/
rotate
(
angle
,
resize
=
true
)
{
const
frame
=
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
rotate
(
360
-
(
angle
%
360
)
,
resize
)
;
const
out
=
new
Image
(
frame
.
width
,
frame
.
height
)
;
out
.
bitmap
.
set
(
frame
.
u8
)
;
return
this
.
__apply__
(
out
)
;
}
/**
* Flips / mirrors the image horizontally or vertically
*
@param
{
'horizontal' | 'vertical'
} direction The direction to flip
*/
flip
(
direction
)
{
const
frame
=
new
v2
(
this
.
width
,
this
.
height
,
this
.
bitmap
)
.
flip
(
direction
)
;
this
.
bitmap
.
set
(
frame
.
u8
)
;
return
this
;
}
/**
*
@private
*
@param
{
Image|Frame
} image
*
@returns
{
Image|Frame
}
*/
__apply__
(
image
)
{
this
.
__width__
=
image
.
__width__
;
this
.
__height__
=
image
.
__height__
;
this
.
__view__
=
image
.
__view__
;
this
.
__u32__
=
image
.
__u32__
;
this
.
bitmap
=
image
.
bitmap
;
if
(
image
instanceof
Frame
)
return
Frame
.
from
(
this
,
image
.
duration
,
image
.
xOffset
,
image
.
yOffset
,
image
.
disposalMode
)
;
return
this
;
}
/**
* Creates a multi-point gradient generator
*
@param
{
Object<number, number>
} colors The gradient points to use (e.g. `{0: 0xff0000ff, 1: 0x00ff00ff}`)
*
@return
{
(function(number): number)
} The gradient generator. The function argument is the position in the gradient (0..1).
*/
static
gradient
(
colors
)
{
const
entries
=
Object
.
entries
(
colors
)
.
sort
(
(
a
,
b
)
=>
a
[
0
]
-
b
[
0
]
)
;
const
positions
=
entries
.
map
(
e
=>
parseFloat
(
e
[
0
]
)
)
;
const
values
=
entries
.
map
(
e
=>
e
[
1
]
)
;
if
(
positions
.
length
===
0
)
throw
new
RangeError
(
'Invalid gradient point count'
)
;
else
if
(
positions
.
length
===
1
)
{
return
(
)
=>
values
[
0
]
;
}
else
if
(
positions
.
length
===
2
)
{
const
gradient
=
this
.
__gradient__
(
values
[
0
]
,
values
[
1
]
)
;
return
position
=>
{
if
(
position
<=
positions
[
0
]
)
return
values
[
0
]
;
if
(
position
>=
positions
[
1
]
)
return
values
[
1
]
;
return
gradient
(
(
position
-
positions
[
0
]
)
/
(
positions
[
1
]
-
positions
[
0
]
)
)
;
}
;
}
const
minDef
=
Math
.
min
(
...
positions
)
;
const
maxDef
=
Math
.
max
(
...
positions
)
;
let
gradients
=
[
]
;
for
(
let
i
=
0
;
i
<
positions
.
length
;
i
++
)
{
let
minPos
=
positions
[
i
-
1
]
;
if
(
minPos
===
undefined
)
continue
;
let
maxPos
=
positions
[
i
]
;
let
minVal
=
values
[
i
-
1
]
;
if
(
minVal
===
undefined
)
minVal
=
values
[
i
]
;
const
maxVal
=
values
[
i
]
;
const
gradient
=
this
.
__gradient__
(
minVal
,
maxVal
)
;
gradients
.
push
(
{
min
:
minPos
,
max
:
maxPos
,
gradient
}
)
;
}
return
position
=>
{
if
(
position
<=
minDef
)
return
gradients
[
0
]
.
gradient
(
0
)
;
if
(
position
>=
maxDef
)
return
gradients
[
gradients
.
length
-
1
]
.
gradient
(
1
)
;
for
(
const
gradient
of
gradients
)
if
(
position
>=
gradient
.
min
&&
position
<=
gradient
.
max
)
return
gradient
.
gradient
(
(
position
-
gradient
.
min
)
/
(
gradient
.
max
-
gradient
.
min
)
)
;
throw
new
RangeError
(
`Invalid gradient position:
${
position
}
`
)
;
}
;
}
/**
* Rounds the images corners
*
@param
{
number
} [radius=min(width,height)/4] The radius of the corners
*
@return
{
Image
}
*/
roundCorners
(
radius
=
Math
.
min
(
this
.
width
,
this
.
height
)
/
4
)
{
const
radSquared
=
radius
**
2
;
for
(
let
x
=
1
;
x
<=
radius
;
x
++
)
{
const
xRad
=
(
x
-
radius
)
**
2
;
for
(
let
y
=
1
;
y
<=
radius
;
y
++
)
{
if
(
xRad
+
(
y
-
radius
)
**
2
>
radSquared
)
this
.
bitmap
[
(
(
y
-
1
)
*
this
.
width
+
x
-
1
)
*
4
+
3
]
=
0
;
}
}
for
(
let
x
=
1
;
x
<=
radius
;
x
++
)
{
const
xRad
=
(
x
-
radius
)
**
2
;
for
(
let
y
=
this
.
height
-
radius
;
y
<=
this
.
height
;
y
++
)
{
if
(
xRad
+
(
(
this
.
height
-
y
)
-
radius
)
**
2
>
radSquared
)
this
.
bitmap
[
(
(
y
-
1
)
*
this
.
width
+
x
-
1
)
*
4
+
3
]
=
0
;
}
}
for
(
let
x
=
this
.
width
-
radius
;
x
<=
this
.
width
;
x
++
)
{
const
xRad
=
(
(
this
.
width
-
x
)
-
radius
)
**
2
;
for
(
let
y
=
1
;
y
<=
radius
;
y
++
)
{
if
(
xRad
+
(
y
-
radius
)
**
2
>
radSquared
)
this
.
bitmap
[
(
(
y
-
1
)
*
this
.
width
+
x
-
1
)
*
4
+
3
]
=
0
;
}
}
for
(
let
x
=
this
.
width
-
radius
;
x
<=
this
.
width
;
x
++
)
{
const
xRad
=
(
(
this
.
width
-
x
)
-
radius
)
**
2
;
for
(
let
y
=
this
.
height
-
radius
;
y
<=
this
.
height
;
y
++
)
{
if
(
xRad
+
(
(
this
.
height
-
y
)
-
radius
)
**
2
>
radSquared
)
this
.
bitmap
[
(
(
y
-
1
)
*
this
.
width
+
x
-
1
)
*
4
+
3
]
=
0
;
}
}
return
this
;
}
/**
*
@private
*/
static
__gradient__
(
startColor
,
endColor
)
{
const
sr
=
startColor
>>>
24
;
const
sg
=
startColor
>>
16
&
0xff
;
const
sb
=
startColor
>>
8
&
0xff
;
const
sa
=
startColor
&
0xff
;
const
er
=
(
endColor
>>>
24
)
-
sr
;
const
eg
=
(
endColor
>>
16
&
0xff
)
-
sg
;
const
eb
=
(
endColor
>>
8
&
0xff
)
-
sb
;
const
ea
=
(
endColor
&
0xff
)
-
sa
;
return
position
=>
{
const
r
=
sr
+
position
*
er
;
const
g
=
sg
+
position
*
eg
;
const
b
=
sb
+
position
*
eb
;
const
a
=
sa
+
position
*
ea
;
return
(
(
(
r
&
0xff
)
<<
24
)
|
(
(
g
&
0xff
)
<<
16
)
|
(
(
b
&
0xff
)
<<
8
)
|
(
a
&
0xff
)
)
;
}
;
}
fisheye
(
radius
=
2
)
{
const
r
=
new
Image
(
this
.
width
,
this
.
height
)
;
const
w
=
this
.
width
;
const
h
=
this
.
height
;
const
tu32
=
this
.
__u32__
;
const
ru32
=
r
.
__u32__
;
const
iw
=
1
/
w
;
const
ih
=
1
/
h
;
for
(
const
[
x
,
y
]
of
this
)
{
const
xco
=
x
*
iw
-
.5
;
const
yco
=
y
*
ih
-
.5
;
const
dfc
=
Math
.
sqrt
(
xco
**
2
+
yco
**
2
)
;
const
dis
=
2
*
dfc
**
radius
;
const
nx
=
(
(
dis
*
xco
/
dfc
+
0.5
)
*
w
)
|
0
;
const
ny
=
(
(
dis
*
yco
/
dfc
+
0.5
)
*
h
)
|
0
;
if
(
nx
<
1
||
nx
>
w
||
ny
<
1
||
ny
>
h
||
isNaN
(
nx
)
||
isNaN
(
ny
)
)
continue
;
ru32
[
y
*
w
+
x
]
=
tu32
[
w
*
ny
+
nx
]
;
}
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