-
Notifications
You must be signed in to change notification settings - Fork 0
/
pixel.go
211 lines (182 loc) · 3.82 KB
/
pixel.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
package notescan
import (
"fmt"
"image"
"image/color"
"math"
"sort"
)
type Pixel struct {
R uint8
G uint8
B uint8
H float64
S float64
V float64
}
// pack pixel data into an integer
func Pack(p *Pixel) int {
return int(p.R)<<16 | int(p.G)<<8 | int(p.B)
}
// restore to original rgb format
func UnPack(v int) (uint8, uint8, uint8) {
r := uint8((v >> 16) & 0xFF)
g := uint8((v >> 8) & 0xFF)
b := uint8(v & 0xFF)
return r, g, b
}
// generate pixel from color
func NewPixel(c color.Color) *Pixel {
cc, err := convertColor(c)
if err != nil {
return nil
}
return NewPixelRGB(cc.R, cc.G, cc.B)
}
// generate pixel from RGB
func NewPixelRGB(r, g, b uint8) *Pixel {
p := &Pixel{}
p.R = r
p.G = g
p.B = b
p.H, p.S, p.V = RGB2HSV(p.R, p.G, p.B)
return p
}
// generate pixel from HSV
func NewPixelHSV(h, s, v float64) *Pixel {
c := HSV2RGBA(h, s, v)
return NewPixelRGB(c.R, c.G, c.B)
}
// get HSV space distance
func (p Pixel) DistanceHSV(src *Pixel) (float64, float64, float64) {
h := math.Abs(src.H - p.H)
s := math.Abs(src.S - p.S)
v := math.Abs(src.V - p.V)
return h, s, v
}
// get RGB space distance
func (p Pixel) DistanceRGB(src *Pixel) float64 {
all := 0.0
r := float64(src.R) - float64(p.R)
g := float64(src.G) - float64(p.G)
b := float64(src.B) - float64(p.B)
all += r * r
all += g * g
all += b * b
return all
}
// shift operation
func (p Pixel) Shift(shift uint) *Pixel {
r := uint8((p.R >> shift) << shift)
g := uint8((p.G >> shift) << shift)
b := uint8((p.B >> shift) << shift)
return NewPixelRGB(r, g, b)
}
// generate color
func (p Pixel) Color() *color.RGBA {
return UIntRGBA(p.R, p.G, p.B)
}
// generate string
func (p Pixel) String() string {
rtn := fmt.Sprintf("R[%d]G[%d]B[%d] = H[%f]S[%f]V[%f]", p.R, p.G, p.B, p.H, p.S, p.V)
return rtn
}
type Pixels []*Pixel
// get the most populous color
func (p Pixels) Most() *Pixel {
counter := make(map[int]int)
for _, pix := range p {
val := Pack(pix)
counter[val]++
}
max := 0
val := 0
for key, count := range counter {
if count > max {
max = count
val = key
}
}
return NewPixelRGB(UnPack(val))
}
// get the color that rounds all data
func (p Pixels) Quantize(s int) (Pixels, error) {
if s >= 8 {
return nil, fmt.Errorf("Shift can't be over 8")
}
shift := uint(s)
quantize := make([]*Pixel, len(p))
for idx, pix := range p {
quantize[idx] = pix.Shift(shift)
}
return quantize, nil
}
// get the average color
func (p Pixels) Average() (*Pixel, error) {
if p == nil {
return nil, fmt.Errorf("Pixels is nil")
}
length := len(p)
if length == 0 {
return nil, fmt.Errorf("Pixels length is zero")
}
r, g, b := 0.0, 0.0, 0.0
for _, d := range p {
r += float64(d.R)
g += float64(d.G)
b += float64(d.B)
}
avg := 1.0 / float64(length)
r = r * avg
g = g * avg
b = b * avg
c := FloatRGBA(r, g, b)
return NewPixel(c), nil
}
// create image
func (p Pixels) ToImage(cols, rows int) (image.Image,error) {
idx := 0
img := image.NewRGBA(image.Rect(0, 0, cols, rows))
for col := 0; col < cols; col++ {
for row := 0; row < rows; row++ {
img.Set(col, row, p[idx].Color())
idx++
}
}
return img,nil
}
// sorting
func (p Pixels) Sort() error {
sort.Slice(p, func(i, j int) bool {
pi := Pack(p[i])
pj := Pack(p[j])
iRGB := int((pi>>16)&0xFF) +
int((pi>>8)&0xFF) +
int(pi&0xFF)
jRGB := int((pj>>16)&0xFF) +
int((pj>>8)&0xFF) +
int(pj&0xFF)
return iRGB < jRGB
})
return nil
}
// create palette for debugging
func (p Pixels) debug(f string) error {
length := len(p)
if length > 20 {
return fmt.Errorf("Length of Pixels greater than 20 isn't supported")
}
img,err := p.ToImage(length, 1)
if err != nil {
return err
}
return OutputPNG(f, img)
}
// output
func (p Pixels) output(f string, cols, rows int) error {
img,err := p.ToImage(cols, rows)
if err != nil {
return err
}
return OutputPNG(f, img)
}