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go
golang
Commits
a3372bd6
Commit
a3372bd6
authored
Feb 02, 2010
by
Nigel Tao
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New image.A type, to represent anti-aliased font glyphs.
R=r, rsc CC=golang-dev
https://golang.org/cl/199052
parent
d00210f5
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2 changed files
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53 additions
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0 deletions
+53
-0
color.go
src/pkg/image/color.go
+23
-0
image.go
src/pkg/image/image.go
+30
-0
No files found.
src/pkg/image/color.go
View file @
a3372bd6
...
...
@@ -100,6 +100,18 @@ func (c NRGBA64Color) RGBA() (r, g, b, a uint32) {
return
}
// An AlphaColor represents an 8-bit alpha.
type
AlphaColor
struct
{
A
uint8
}
func
(
c
AlphaColor
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
a
=
uint32
(
c
.
A
)
a
|=
a
<<
8
a
|=
a
<<
16
return
a
,
a
,
a
,
a
}
// A ColorModel can convert foreign Colors, with a possible loss of precision, to a Color
// from its own color model.
type
ColorModel
interface
{
...
...
@@ -176,6 +188,14 @@ func toNRGBA64Color(c Color) Color {
return
NRGBA64Color
{
uint16
(
r
),
uint16
(
g
),
uint16
(
b
),
uint16
(
a
)}
}
func
toAlphaColor
(
c
Color
)
Color
{
if
_
,
ok
:=
c
.
(
AlphaColor
);
ok
{
// no-op conversion
return
c
}
_
,
_
,
_
,
a
:=
c
.
RGBA
()
return
AlphaColor
{
uint8
(
a
>>
24
)}
}
// The ColorModel associated with RGBAColor.
var
RGBAColorModel
ColorModel
=
ColorModelFunc
(
toRGBAColor
)
...
...
@@ -187,3 +207,6 @@ var NRGBAColorModel ColorModel = ColorModelFunc(toNRGBAColor)
// The ColorModel associated with NRGBA64Color.
var
NRGBA64ColorModel
ColorModel
=
ColorModelFunc
(
toNRGBA64Color
)
// The ColorModel associated with AlphaColor.
var
AlphaColorModel
ColorModel
=
ColorModelFunc
(
toAlphaColor
)
src/pkg/image/image.go
View file @
a3372bd6
...
...
@@ -135,6 +135,36 @@ func NewNRGBA64(w, h int) *NRGBA64 {
return
&
NRGBA64
{
pixel
}
}
// An Alpha is an in-memory image backed by a 2-D slice of AlphaColor values.
type
Alpha
struct
{
// The Pixel field's indices are y first, then x, so that At(x, y) == Pixel[y][x].
Pixel
[][]
AlphaColor
}
func
(
p
*
Alpha
)
ColorModel
()
ColorModel
{
return
AlphaColorModel
}
func
(
p
*
Alpha
)
Width
()
int
{
if
len
(
p
.
Pixel
)
==
0
{
return
0
}
return
len
(
p
.
Pixel
[
0
])
}
func
(
p
*
Alpha
)
Height
()
int
{
return
len
(
p
.
Pixel
)
}
func
(
p
*
Alpha
)
At
(
x
,
y
int
)
Color
{
return
p
.
Pixel
[
y
][
x
]
}
func
(
p
*
Alpha
)
Set
(
x
,
y
int
,
c
Color
)
{
p
.
Pixel
[
y
][
x
]
=
toAlphaColor
(
c
)
.
(
AlphaColor
)
}
// NewAlpha returns a new Alpha with the given width and height.
func
NewAlpha
(
w
,
h
int
)
*
Alpha
{
pixel
:=
make
([][]
AlphaColor
,
h
)
for
y
:=
0
;
y
<
h
;
y
++
{
pixel
[
y
]
=
make
([]
AlphaColor
,
w
)
}
return
&
Alpha
{
pixel
}
}
// A PalettedColorModel represents a fixed palette of colors.
type
PalettedColorModel
[]
Color
...
...
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