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go
golang
Commits
2bb59fd7
Commit
2bb59fd7
authored
May 28, 2010
by
Nigel Tao
Browse files
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Browse Files
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Email Patches
Plain Diff
Make image.Color.RGBA return 16 bit color instead of 32 bit color.
R=rsc CC=golang-dev
https://golang.org/cl/1388041
parent
d5a8647d
Show whitespace changes
Inline
Side-by-side
Showing
8 changed files
with
41 additions
and
108 deletions
+41
-108
color.go
src/pkg/exp/draw/color.go
+1
-5
draw.go
src/pkg/exp/draw/draw.go
+1
-21
draw_test.go
src/pkg/exp/draw/draw_test.go
+0
-9
image.go
src/pkg/exp/nacl/av/image.go
+0
-4
color.go
src/pkg/image/color.go
+21
-48
image.go
src/pkg/image/image.go
+7
-10
reader_test.go
src/pkg/image/png/reader_test.go
+3
-3
writer.go
src/pkg/image/png/writer.go
+8
-8
No files found.
src/pkg/exp/draw/color.go
View file @
2bb59fd7
...
@@ -51,13 +51,9 @@ func (c Color) RGBA() (r, g, b, a uint32) {
...
@@ -51,13 +51,9 @@ func (c Color) RGBA() (r, g, b, a uint32) {
x
:=
uint32
(
c
)
x
:=
uint32
(
c
)
r
,
g
,
b
,
a
=
x
>>
24
,
(
x
>>
16
)
&
0xFF
,
(
x
>>
8
)
&
0xFF
,
x
&
0xFF
r
,
g
,
b
,
a
=
x
>>
24
,
(
x
>>
16
)
&
0xFF
,
(
x
>>
8
)
&
0xFF
,
x
&
0xFF
r
|=
r
<<
8
r
|=
r
<<
8
r
|=
r
<<
16
g
|=
g
<<
8
g
|=
g
<<
8
g
|=
g
<<
16
b
|=
b
<<
8
b
|=
b
<<
8
b
|=
b
<<
16
a
|=
a
<<
8
a
|=
a
<<
8
a
|=
a
<<
16
return
return
}
}
...
@@ -103,7 +99,7 @@ func toColor(color image.Color) image.Color {
...
@@ -103,7 +99,7 @@ func toColor(color image.Color) image.Color {
return
c
return
c
}
}
r
,
g
,
b
,
a
:=
color
.
RGBA
()
r
,
g
,
b
,
a
:=
color
.
RGBA
()
return
Color
(
r
>>
24
<<
24
|
g
>>
24
<<
16
|
b
>>
24
<<
8
|
a
>>
24
)
return
Color
(
r
>>
8
<<
24
|
g
>>
8
<<
16
|
b
>>
8
<<
8
|
a
>>
8
)
}
}
func
(
c
Color
)
ColorModel
()
image
.
ColorModel
{
return
image
.
ColorModelFunc
(
toColor
)
}
func
(
c
Color
)
ColorModel
()
image
.
ColorModel
{
return
image
.
ColorModelFunc
(
toColor
)
}
src/pkg/exp/draw/draw.go
View file @
2bb59fd7
...
@@ -105,13 +105,10 @@ func DrawMask(dst Image, r Rectangle, src image.Image, sp Point, mask image.Imag
...
@@ -105,13 +105,10 @@ func DrawMask(dst Image, r Rectangle, src image.Image, sp Point, mask image.Imag
sx
:=
sp
.
X
+
x0
-
r
.
Min
.
X
sx
:=
sp
.
X
+
x0
-
r
.
Min
.
X
mx
:=
mp
.
X
+
x0
-
r
.
Min
.
X
mx
:=
mp
.
X
+
x0
-
r
.
Min
.
X
for
x
:=
x0
;
x
!=
x1
;
x
,
sx
,
mx
=
x
+
dx
,
sx
+
dx
,
mx
+
dx
{
for
x
:=
x0
;
x
!=
x1
;
x
,
sx
,
mx
=
x
+
dx
,
sx
+
dx
,
mx
+
dx
{
// A nil mask is equivalent to a fully opaque, infinitely large mask.
// We work in 16-bit color, so that multiplying two values does not overflow a uint32.
const
M
=
1
<<
16
-
1
const
M
=
1
<<
16
-
1
ma
:=
uint32
(
M
)
ma
:=
uint32
(
M
)
if
mask
!=
nil
{
if
mask
!=
nil
{
_
,
_
,
_
,
ma
=
mask
.
At
(
mx
,
my
)
.
RGBA
()
_
,
_
,
_
,
ma
=
mask
.
At
(
mx
,
my
)
.
RGBA
()
ma
>>=
16
}
}
switch
{
switch
{
case
ma
==
0
:
case
ma
==
0
:
...
@@ -124,19 +121,11 @@ func DrawMask(dst Image, r Rectangle, src image.Image, sp Point, mask image.Imag
...
@@ -124,19 +121,11 @@ func DrawMask(dst Image, r Rectangle, src image.Image, sp Point, mask image.Imag
dst
.
Set
(
x
,
y
,
src
.
At
(
sx
,
sy
))
dst
.
Set
(
x
,
y
,
src
.
At
(
sx
,
sy
))
default
:
default
:
sr
,
sg
,
sb
,
sa
:=
src
.
At
(
sx
,
sy
)
.
RGBA
()
sr
,
sg
,
sb
,
sa
:=
src
.
At
(
sx
,
sy
)
.
RGBA
()
sr
>>=
16
sg
>>=
16
sb
>>=
16
sa
>>=
16
if
out
==
nil
{
if
out
==
nil
{
out
=
new
(
image
.
RGBA64Color
)
out
=
new
(
image
.
RGBA64Color
)
}
}
if
op
==
Over
{
if
op
==
Over
{
dr
,
dg
,
db
,
da
:=
dst
.
At
(
x
,
y
)
.
RGBA
()
dr
,
dg
,
db
,
da
:=
dst
.
At
(
x
,
y
)
.
RGBA
()
dr
>>=
16
dg
>>=
16
db
>>=
16
da
>>=
16
a
:=
M
-
(
sa
*
ma
/
M
)
a
:=
M
-
(
sa
*
ma
/
M
)
out
.
R
=
uint16
((
dr
*
a
+
sr
*
ma
)
/
M
)
out
.
R
=
uint16
((
dr
*
a
+
sr
*
ma
)
/
M
)
out
.
G
=
uint16
((
dg
*
a
+
sg
*
ma
)
/
M
)
out
.
G
=
uint16
((
dg
*
a
+
sg
*
ma
)
/
M
)
...
@@ -158,10 +147,6 @@ func drawGlyphOver(dst *image.RGBA, r Rectangle, src image.ColorImage, mask *ima
...
@@ -158,10 +147,6 @@ func drawGlyphOver(dst *image.RGBA, r Rectangle, src image.ColorImage, mask *ima
x0
,
x1
:=
r
.
Min
.
X
,
r
.
Max
.
X
x0
,
x1
:=
r
.
Min
.
X
,
r
.
Max
.
X
y0
,
y1
:=
r
.
Min
.
Y
,
r
.
Max
.
Y
y0
,
y1
:=
r
.
Min
.
Y
,
r
.
Max
.
Y
cr
,
cg
,
cb
,
ca
:=
src
.
RGBA
()
cr
,
cg
,
cb
,
ca
:=
src
.
RGBA
()
cr
>>=
16
cg
>>=
16
cb
>>=
16
ca
>>=
16
for
y
,
my
:=
y0
,
mp
.
Y
;
y
!=
y1
;
y
,
my
=
y
+
1
,
my
+
1
{
for
y
,
my
:=
y0
,
mp
.
Y
;
y
!=
y1
;
y
,
my
=
y
+
1
,
my
+
1
{
p
:=
dst
.
Pixel
[
y
]
p
:=
dst
.
Pixel
[
y
]
for
x
,
mx
:=
x0
,
mp
.
X
;
x
!=
x1
;
x
,
mx
=
x
+
1
,
mx
+
1
{
for
x
,
mx
:=
x0
,
mp
.
X
;
x
!=
x1
;
x
,
mx
=
x
+
1
,
mx
+
1
{
...
@@ -192,7 +177,7 @@ func drawFill(dst *image.RGBA, r Rectangle, src image.ColorImage) {
...
@@ -192,7 +177,7 @@ func drawFill(dst *image.RGBA, r Rectangle, src image.ColorImage) {
return
return
}
}
cr
,
cg
,
cb
,
ca
:=
src
.
RGBA
()
cr
,
cg
,
cb
,
ca
:=
src
.
RGBA
()
color
:=
image
.
RGBAColor
{
uint8
(
cr
>>
24
),
uint8
(
cg
>>
24
),
uint8
(
cb
>>
24
),
uint8
(
ca
>>
24
)}
color
:=
image
.
RGBAColor
{
uint8
(
cr
>>
8
),
uint8
(
cg
>>
8
),
uint8
(
cb
>>
8
),
uint8
(
ca
>>
8
)}
// The built-in copy function is faster than a straightforward for loop to fill the destination with
// The built-in copy function is faster than a straightforward for loop to fill the destination with
// the color, but copy requires a slice source. We therefore use a for loop to fill the first row, and
// the color, but copy requires a slice source. We therefore use a for loop to fill the first row, and
// then use the first row as the slice source for the remaining rows.
// then use the first row as the slice source for the remaining rows.
...
@@ -238,13 +223,8 @@ func drawRGBA(dst *image.RGBA, r Rectangle, src image.Image, sp Point, mask imag
...
@@ -238,13 +223,8 @@ func drawRGBA(dst *image.RGBA, r Rectangle, src image.Image, sp Point, mask imag
ma
:=
uint32
(
M
)
ma
:=
uint32
(
M
)
if
mask
!=
nil
{
if
mask
!=
nil
{
_
,
_
,
_
,
ma
=
mask
.
At
(
mx
,
my
)
.
RGBA
()
_
,
_
,
_
,
ma
=
mask
.
At
(
mx
,
my
)
.
RGBA
()
ma
>>=
16
}
}
sr
,
sg
,
sb
,
sa
:=
src
.
At
(
sx
,
sy
)
.
RGBA
()
sr
,
sg
,
sb
,
sa
:=
src
.
At
(
sx
,
sy
)
.
RGBA
()
sr
>>=
16
sg
>>=
16
sb
>>=
16
sa
>>=
16
var
dr
,
dg
,
db
,
da
uint32
var
dr
,
dg
,
db
,
da
uint32
if
op
==
Over
{
if
op
==
Over
{
rgba
:=
p
[
x
]
rgba
:=
p
[
x
]
...
...
src/pkg/exp/draw/draw_test.go
View file @
2bb59fd7
...
@@ -106,20 +106,11 @@ func makeGolden(dst image.Image, t drawTest) image.Image {
...
@@ -106,20 +106,11 @@ func makeGolden(dst image.Image, t drawTest) image.Image {
var
dr
,
dg
,
db
,
da
uint32
var
dr
,
dg
,
db
,
da
uint32
if
t
.
op
==
Over
{
if
t
.
op
==
Over
{
dr
,
dg
,
db
,
da
=
dst
.
At
(
x
,
y
)
.
RGBA
()
dr
,
dg
,
db
,
da
=
dst
.
At
(
x
,
y
)
.
RGBA
()
dr
>>=
16
dg
>>=
16
db
>>=
16
da
>>=
16
}
}
sr
,
sg
,
sb
,
sa
:=
t
.
src
.
At
(
sx
,
sy
)
.
RGBA
()
sr
,
sg
,
sb
,
sa
:=
t
.
src
.
At
(
sx
,
sy
)
.
RGBA
()
sr
>>=
16
sg
>>=
16
sb
>>=
16
sa
>>=
16
ma
:=
uint32
(
M
)
ma
:=
uint32
(
M
)
if
t
.
mask
!=
nil
{
if
t
.
mask
!=
nil
{
_
,
_
,
_
,
ma
=
t
.
mask
.
At
(
mx
,
my
)
.
RGBA
()
_
,
_
,
_
,
ma
=
t
.
mask
.
At
(
mx
,
my
)
.
RGBA
()
ma
>>=
16
}
}
a
:=
M
-
(
sa
*
ma
/
M
)
a
:=
M
-
(
sa
*
ma
/
M
)
golden
.
Set
(
x
,
y
,
image
.
RGBA64Color
{
golden
.
Set
(
x
,
y
,
image
.
RGBA64Color
{
...
...
src/pkg/exp/nacl/av/image.go
View file @
2bb59fd7
...
@@ -61,16 +61,12 @@ func (p Color) RGBA() (r, g, b, a uint32) {
...
@@ -61,16 +61,12 @@ func (p Color) RGBA() (r, g, b, a uint32) {
x
:=
uint32
(
p
)
x
:=
uint32
(
p
)
a
=
x
>>
24
a
=
x
>>
24
a
|=
a
<<
8
a
|=
a
<<
8
a
|=
a
<<
16
r
=
(
x
>>
16
)
&
0xFF
r
=
(
x
>>
16
)
&
0xFF
r
|=
r
<<
8
r
|=
r
<<
8
r
|=
r
<<
16
g
=
(
x
>>
8
)
&
0xFF
g
=
(
x
>>
8
)
&
0xFF
g
|=
g
<<
8
g
|=
g
<<
8
g
|=
g
<<
16
b
=
x
&
0xFF
b
=
x
&
0xFF
b
|=
b
<<
8
b
|=
b
<<
8
b
|=
b
<<
16
return
return
}
}
...
...
src/pkg/image/color.go
View file @
2bb59fd7
...
@@ -4,14 +4,15 @@
...
@@ -4,14 +4,15 @@
package
image
package
image
//
TODO(nigeltao): Think about how floating-point color models work.
//
All Colors can convert themselves, with a possible loss of precision,
// to 64-bit alpha-premultiplied RGBA. Each channel value ranges within
//
All Colors can convert themselves, with a possible loss of precision, to 128-bit alpha-premultiplied RGBA
.
//
[0, 0xFFFF]
.
type
Color
interface
{
type
Color
interface
{
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
}
}
// An RGBAColor represents a traditional 32-bit alpha-premultiplied color, having 8 bits for each of red, green, blue and alpha.
// An RGBAColor represents a traditional 32-bit alpha-premultiplied color,
// having 8 bits for each of red, green, blue and alpha.
type
RGBAColor
struct
{
type
RGBAColor
struct
{
R
,
G
,
B
,
A
uint8
R
,
G
,
B
,
A
uint8
}
}
...
@@ -19,34 +20,23 @@ type RGBAColor struct {
...
@@ -19,34 +20,23 @@ type RGBAColor struct {
func
(
c
RGBAColor
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
func
(
c
RGBAColor
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
r
=
uint32
(
c
.
R
)
r
=
uint32
(
c
.
R
)
r
|=
r
<<
8
r
|=
r
<<
8
r
|=
r
<<
16
g
=
uint32
(
c
.
G
)
g
=
uint32
(
c
.
G
)
g
|=
g
<<
8
g
|=
g
<<
8
g
|=
g
<<
16
b
=
uint32
(
c
.
B
)
b
=
uint32
(
c
.
B
)
b
|=
b
<<
8
b
|=
b
<<
8
b
|=
b
<<
16
a
=
uint32
(
c
.
A
)
a
=
uint32
(
c
.
A
)
a
|=
a
<<
8
a
|=
a
<<
8
a
|=
a
<<
16
return
return
}
}
// An RGBA64Color represents a 64-bit alpha-premultiplied color, having 16 bits for each of red, green, blue and alpha.
// An RGBA64Color represents a 64-bit alpha-premultiplied color,
// having 16 bits for each of red, green, blue and alpha.
type
RGBA64Color
struct
{
type
RGBA64Color
struct
{
R
,
G
,
B
,
A
uint16
R
,
G
,
B
,
A
uint16
}
}
func
(
c
RGBA64Color
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
func
(
c
RGBA64Color
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
r
=
uint32
(
c
.
R
)
return
uint32
(
c
.
R
),
uint32
(
c
.
G
),
uint32
(
c
.
B
),
uint32
(
c
.
A
)
r
|=
r
<<
16
g
=
uint32
(
c
.
G
)
g
|=
g
<<
16
b
=
uint32
(
c
.
B
)
b
|=
b
<<
16
a
=
uint32
(
c
.
A
)
a
|=
a
<<
16
return
}
}
// An NRGBAColor represents a non-alpha-premultiplied 32-bit color.
// An NRGBAColor represents a non-alpha-premultiplied 32-bit color.
...
@@ -59,24 +49,21 @@ func (c NRGBAColor) RGBA() (r, g, b, a uint32) {
...
@@ -59,24 +49,21 @@ func (c NRGBAColor) RGBA() (r, g, b, a uint32) {
r
|=
r
<<
8
r
|=
r
<<
8
r
*=
uint32
(
c
.
A
)
r
*=
uint32
(
c
.
A
)
r
/=
0xff
r
/=
0xff
r
|=
r
<<
16
g
=
uint32
(
c
.
G
)
g
=
uint32
(
c
.
G
)
g
|=
g
<<
8
g
|=
g
<<
8
g
*=
uint32
(
c
.
A
)
g
*=
uint32
(
c
.
A
)
g
/=
0xff
g
/=
0xff
g
|=
g
<<
16
b
=
uint32
(
c
.
B
)
b
=
uint32
(
c
.
B
)
b
|=
b
<<
8
b
|=
b
<<
8
b
*=
uint32
(
c
.
A
)
b
*=
uint32
(
c
.
A
)
b
/=
0xff
b
/=
0xff
b
|=
b
<<
16
a
=
uint32
(
c
.
A
)
a
=
uint32
(
c
.
A
)
a
|=
a
<<
8
a
|=
a
<<
8
a
|=
a
<<
16
return
return
}
}
// An NRGBA64Color represents a non-alpha-premultiplied 64-bit color, having 16 bits for each of red, green, blue and alpha.
// An NRGBA64Color represents a non-alpha-premultiplied 64-bit color,
// having 16 bits for each of red, green, blue and alpha.
type
NRGBA64Color
struct
{
type
NRGBA64Color
struct
{
R
,
G
,
B
,
A
uint16
R
,
G
,
B
,
A
uint16
}
}
...
@@ -85,18 +72,13 @@ func (c NRGBA64Color) RGBA() (r, g, b, a uint32) {
...
@@ -85,18 +72,13 @@ func (c NRGBA64Color) RGBA() (r, g, b, a uint32) {
r
=
uint32
(
c
.
R
)
r
=
uint32
(
c
.
R
)
r
*=
uint32
(
c
.
A
)
r
*=
uint32
(
c
.
A
)
r
/=
0xffff
r
/=
0xffff
r
|=
r
<<
16
g
=
uint32
(
c
.
G
)
g
=
uint32
(
c
.
G
)
g
*=
uint32
(
c
.
A
)
g
*=
uint32
(
c
.
A
)
g
/=
0xffff
g
/=
0xffff
g
|=
g
<<
16
b
=
uint32
(
c
.
B
)
b
=
uint32
(
c
.
B
)
b
*=
uint32
(
c
.
A
)
b
*=
uint32
(
c
.
A
)
b
/=
0xffff
b
/=
0xffff
b
|=
b
<<
16
a
=
uint32
(
c
.
A
)
a
=
uint32
(
c
.
A
)
a
|=
a
<<
8
a
|=
a
<<
16
return
return
}
}
...
@@ -108,12 +90,11 @@ type AlphaColor struct {
...
@@ -108,12 +90,11 @@ type AlphaColor struct {
func
(
c
AlphaColor
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
func
(
c
AlphaColor
)
RGBA
()
(
r
,
g
,
b
,
a
uint32
)
{
a
=
uint32
(
c
.
A
)
a
=
uint32
(
c
.
A
)
a
|=
a
<<
8
a
|=
a
<<
8
a
|=
a
<<
16
return
a
,
a
,
a
,
a
return
a
,
a
,
a
,
a
}
}
// A ColorModel can convert foreign Colors, with a possible loss of precision,
to a Color
// A ColorModel can convert foreign Colors, with a possible loss of precision,
// from its own color model.
//
to a Color
from its own color model.
type
ColorModel
interface
{
type
ColorModel
interface
{
Convert
(
c
Color
)
Color
Convert
(
c
Color
)
Color
}
}
...
@@ -129,36 +110,32 @@ func (f ColorModelFunc) Convert(c Color) Color {
...
@@ -129,36 +110,32 @@ func (f ColorModelFunc) Convert(c Color) Color {
}
}
func
toRGBAColor
(
c
Color
)
Color
{
func
toRGBAColor
(
c
Color
)
Color
{
if
_
,
ok
:=
c
.
(
RGBAColor
);
ok
{
// no-op conversion
if
_
,
ok
:=
c
.
(
RGBAColor
);
ok
{
return
c
return
c
}
}
r
,
g
,
b
,
a
:=
c
.
RGBA
()
r
,
g
,
b
,
a
:=
c
.
RGBA
()
return
RGBAColor
{
uint8
(
r
>>
24
),
uint8
(
g
>>
24
),
uint8
(
b
>>
24
),
uint8
(
a
>>
24
)}
return
RGBAColor
{
uint8
(
r
>>
8
),
uint8
(
g
>>
8
),
uint8
(
b
>>
8
),
uint8
(
a
>>
8
)}
}
}
func
toRGBA64Color
(
c
Color
)
Color
{
func
toRGBA64Color
(
c
Color
)
Color
{
if
_
,
ok
:=
c
.
(
RGBA64Color
);
ok
{
// no-op conversion
if
_
,
ok
:=
c
.
(
RGBA64Color
);
ok
{
return
c
return
c
}
}
r
,
g
,
b
,
a
:=
c
.
RGBA
()
r
,
g
,
b
,
a
:=
c
.
RGBA
()
return
RGBA64Color
{
uint16
(
r
>>
16
),
uint16
(
g
>>
16
),
uint16
(
b
>>
16
),
uint16
(
a
>>
16
)}
return
RGBA64Color
{
uint16
(
r
),
uint16
(
g
),
uint16
(
b
),
uint16
(
a
)}
}
}
func
toNRGBAColor
(
c
Color
)
Color
{
func
toNRGBAColor
(
c
Color
)
Color
{
if
_
,
ok
:=
c
.
(
NRGBAColor
);
ok
{
// no-op conversion
if
_
,
ok
:=
c
.
(
NRGBAColor
);
ok
{
return
c
return
c
}
}
r
,
g
,
b
,
a
:=
c
.
RGBA
()
r
,
g
,
b
,
a
:=
c
.
RGBA
()
a
>>=
16
if
a
==
0xffff
{
if
a
==
0xffff
{
return
NRGBAColor
{
uint8
(
r
>>
24
),
uint8
(
g
>>
24
),
uint8
(
b
>>
24
),
0xff
}
return
NRGBAColor
{
uint8
(
r
>>
8
),
uint8
(
g
>>
8
),
uint8
(
b
>>
8
),
0xff
}
}
}
if
a
==
0
{
if
a
==
0
{
return
NRGBAColor
{
0
,
0
,
0
,
0
}
return
NRGBAColor
{
0
,
0
,
0
,
0
}
}
}
r
>>=
16
g
>>=
16
b
>>=
16
// Since Color.RGBA returns a alpha-premultiplied color, we should have r <= a && g <= a && b <= a.
// Since Color.RGBA returns a alpha-premultiplied color, we should have r <= a && g <= a && b <= a.
r
=
(
r
*
0xffff
)
/
a
r
=
(
r
*
0xffff
)
/
a
g
=
(
g
*
0xffff
)
/
a
g
=
(
g
*
0xffff
)
/
a
...
@@ -167,14 +144,10 @@ func toNRGBAColor(c Color) Color {
...
@@ -167,14 +144,10 @@ func toNRGBAColor(c Color) Color {
}
}
func
toNRGBA64Color
(
c
Color
)
Color
{
func
toNRGBA64Color
(
c
Color
)
Color
{
if
_
,
ok
:=
c
.
(
NRGBA64Color
);
ok
{
// no-op conversion
if
_
,
ok
:=
c
.
(
NRGBA64Color
);
ok
{
return
c
return
c
}
}
r
,
g
,
b
,
a
:=
c
.
RGBA
()
r
,
g
,
b
,
a
:=
c
.
RGBA
()
a
>>=
16
r
>>=
16
g
>>=
16
b
>>=
16
if
a
==
0xffff
{
if
a
==
0xffff
{
return
NRGBA64Color
{
uint16
(
r
),
uint16
(
g
),
uint16
(
b
),
0xffff
}
return
NRGBA64Color
{
uint16
(
r
),
uint16
(
g
),
uint16
(
b
),
0xffff
}
}
}
...
@@ -189,11 +162,11 @@ func toNRGBA64Color(c Color) Color {
...
@@ -189,11 +162,11 @@ func toNRGBA64Color(c Color) Color {
}
}
func
toAlphaColor
(
c
Color
)
Color
{
func
toAlphaColor
(
c
Color
)
Color
{
if
_
,
ok
:=
c
.
(
AlphaColor
);
ok
{
// no-op conversion
if
_
,
ok
:=
c
.
(
AlphaColor
);
ok
{
return
c
return
c
}
}
_
,
_
,
_
,
a
:=
c
.
RGBA
()
_
,
_
,
_
,
a
:=
c
.
RGBA
()
return
AlphaColor
{
uint8
(
a
>>
24
)}
return
AlphaColor
{
uint8
(
a
>>
8
)}
}
}
// The ColorModel associated with RGBAColor.
// The ColorModel associated with RGBAColor.
...
...
src/pkg/image/image.go
View file @
2bb59fd7
...
@@ -185,21 +185,18 @@ func (p PalettedColorModel) Convert(c Color) Color {
...
@@ -185,21 +185,18 @@ func (p PalettedColorModel) Convert(c Color) Color {
if
len
(
p
)
==
0
{
if
len
(
p
)
==
0
{
return
nil
return
nil
}
}
// TODO(nigeltao): Revisit the "pick the palette color which minimizes sum-squared-difference"
// algorithm when the premultiplied vs unpremultiplied issue is resolved.
// Currently, we only compare the R, G and B values, and ignore A.
cr
,
cg
,
cb
,
_
:=
c
.
RGBA
()
cr
,
cg
,
cb
,
_
:=
c
.
RGBA
()
// Shift by 1
7 bits
to avoid potential uint32 overflow in sum-squared-difference.
// Shift by 1
bit
to avoid potential uint32 overflow in sum-squared-difference.
cr
>>=
1
7
cr
>>=
1
cg
>>=
1
7
cg
>>=
1
cb
>>=
1
7
cb
>>=
1
result
:=
Color
(
nil
)
result
:=
Color
(
nil
)
bestSSD
:=
uint32
(
1
<<
32
-
1
)
bestSSD
:=
uint32
(
1
<<
32
-
1
)
for
_
,
v
:=
range
p
{
for
_
,
v
:=
range
p
{
vr
,
vg
,
vb
,
_
:=
v
.
RGBA
()
vr
,
vg
,
vb
,
_
:=
v
.
RGBA
()
vr
>>=
1
7
vr
>>=
1
vg
>>=
1
7
vg
>>=
1
vb
>>=
1
7
vb
>>=
1
dr
,
dg
,
db
:=
diff
(
cr
,
vr
),
diff
(
cg
,
vg
),
diff
(
cb
,
vb
)
dr
,
dg
,
db
:=
diff
(
cr
,
vr
),
diff
(
cg
,
vg
),
diff
(
cb
,
vb
)
ssd
:=
(
dr
*
dr
)
+
(
dg
*
dg
)
+
(
db
*
db
)
ssd
:=
(
dr
*
dr
)
+
(
dg
*
dg
)
+
(
db
*
db
)
if
ssd
<
bestSSD
{
if
ssd
<
bestSSD
{
...
...
src/pkg/image/png/reader_test.go
View file @
2bb59fd7
...
@@ -76,9 +76,9 @@ func sng(w io.WriteCloser, filename string, png image.Image) {
...
@@ -76,9 +76,9 @@ func sng(w io.WriteCloser, filename string, png image.Image) {
io
.
WriteString
(
w
,
"PLTE {
\n
"
)
io
.
WriteString
(
w
,
"PLTE {
\n
"
)
for
i
:=
0
;
i
<
len
(
cpm
);
i
++
{
for
i
:=
0
;
i
<
len
(
cpm
);
i
++
{
r
,
g
,
b
,
_
:=
cpm
[
i
]
.
RGBA
()
r
,
g
,
b
,
_
:=
cpm
[
i
]
.
RGBA
()
r
>>=
24
r
>>=
8
g
>>=
24
g
>>=
8
b
>>=
24
b
>>=
8
fmt
.
Fprintf
(
w
,
" (%3d,%3d,%3d) # rgb = (0x%02x,0x%02x,0x%02x)
\n
"
,
r
,
g
,
b
,
r
,
g
,
b
)
fmt
.
Fprintf
(
w
,
" (%3d,%3d,%3d) # rgb = (0x%02x,0x%02x,0x%02x)
\n
"
,
r
,
g
,
b
,
r
,
g
,
b
)
}
}
io
.
WriteString
(
w
,
"}
\n
"
)
io
.
WriteString
(
w
,
"}
\n
"
)
...
...
src/pkg/image/png/writer.go
View file @
2bb59fd7
...
@@ -37,7 +37,7 @@ func opaque(m image.Image) bool {
...
@@ -37,7 +37,7 @@ func opaque(m image.Image) bool {
for
y
:=
0
;
y
<
m
.
Height
();
y
++
{
for
y
:=
0
;
y
<
m
.
Height
();
y
++
{
for
x
:=
0
;
x
<
m
.
Width
();
x
++
{
for
x
:=
0
;
x
<
m
.
Width
();
x
++
{
_
,
_
,
_
,
a
:=
m
.
At
(
x
,
y
)
.
RGBA
()
_
,
_
,
_
,
a
:=
m
.
At
(
x
,
y
)
.
RGBA
()
if
a
!=
0xffff
ffff
{
if
a
!=
0xffff
{
return
false
return
false
}
}
}
}
...
@@ -101,13 +101,13 @@ func (e *encoder) writePLTE(p image.PalettedColorModel) {
...
@@ -101,13 +101,13 @@ func (e *encoder) writePLTE(p image.PalettedColorModel) {
}
}
for
i
:=
0
;
i
<
len
(
p
);
i
++
{
for
i
:=
0
;
i
<
len
(
p
);
i
++
{
r
,
g
,
b
,
a
:=
p
[
i
]
.
RGBA
()
r
,
g
,
b
,
a
:=
p
[
i
]
.
RGBA
()
if
a
!=
0xffff
ffff
{
if
a
!=
0xffff
{
e
.
err
=
UnsupportedError
(
"non-opaque palette color"
)
e
.
err
=
UnsupportedError
(
"non-opaque palette color"
)
return
return
}
}
e
.
tmp
[
3
*
i
+
0
]
=
uint8
(
r
>>
24
)
e
.
tmp
[
3
*
i
+
0
]
=
uint8
(
r
>>
8
)
e
.
tmp
[
3
*
i
+
1
]
=
uint8
(
g
>>
24
)
e
.
tmp
[
3
*
i
+
1
]
=
uint8
(
g
>>
8
)
e
.
tmp
[
3
*
i
+
2
]
=
uint8
(
b
>>
24
)
e
.
tmp
[
3
*
i
+
2
]
=
uint8
(
b
>>
8
)
}
}
e
.
writeChunk
(
e
.
tmp
[
0
:
3
*
len
(
p
)],
"PLTE"
)
e
.
writeChunk
(
e
.
tmp
[
0
:
3
*
len
(
p
)],
"PLTE"
)
}
}
...
@@ -261,9 +261,9 @@ func writeImage(w io.Writer, m image.Image, ct uint8) os.Error {
...
@@ -261,9 +261,9 @@ func writeImage(w io.Writer, m image.Image, ct uint8) os.Error {
for
x
:=
0
;
x
<
m
.
Width
();
x
++
{
for
x
:=
0
;
x
<
m
.
Width
();
x
++
{
// We have previously verified that the alpha value is fully opaque.
// We have previously verified that the alpha value is fully opaque.
r
,
g
,
b
,
_
:=
m
.
At
(
x
,
y
)
.
RGBA
()
r
,
g
,
b
,
_
:=
m
.
At
(
x
,
y
)
.
RGBA
()
cr
[
0
][
3
*
x
+
1
]
=
uint8
(
r
>>
24
)
cr
[
0
][
3
*
x
+
1
]
=
uint8
(
r
>>
8
)
cr
[
0
][
3
*
x
+
2
]
=
uint8
(
g
>>
24
)
cr
[
0
][
3
*
x
+
2
]
=
uint8
(
g
>>
8
)
cr
[
0
][
3
*
x
+
3
]
=
uint8
(
b
>>
24
)
cr
[
0
][
3
*
x
+
3
]
=
uint8
(
b
>>
8
)
}
}
case
ctPaletted
:
case
ctPaletted
:
for
x
:=
0
;
x
<
m
.
Width
();
x
++
{
for
x
:=
0
;
x
<
m
.
Width
();
x
++
{
...
...
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