/
pixelsort.go
177 lines (149 loc) · 3.26 KB
/
pixelsort.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
package main
import (
"flag"
"fmt"
"image"
"image/color"
"image/draw"
"image/jpeg"
"image/png"
"os"
"sort"
)
var nocol = flag.Bool("nocol", false, "don't sort columns")
var norow = flag.Bool("norow", false, "don't sort rows")
var passes = flag.Int("p", 1, "the number of passes to make")
var maxThreshold = flag.Float64("tmax", 60000, "max luma threshold")
var minThreshold = flag.Float64("tmin", 0, "min luma threshold")
var thresholdInc = flag.Float64("tinc", 5000, "threshold increment amount")
var threshold = 0.0
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [files...]\n",
os.Args[0])
flag.PrintDefaults()
}
}
func luma(pixel color.Color) float64 {
r, g, b, _ := pixel.RGBA()
return .2126*float64(r) +
.7152*float64(g) +
.0722*float64(b)
}
type SortableColors []color.Color
func (m SortableColors) Len() int {
return len(m)
}
func (m SortableColors) Swap(i, j int) {
temp := m[j]
m[j] = m[i]
m[i] = temp
}
func (m SortableColors) Less(i, j int) bool {
return luma(m[i]) > luma(m[j])
}
func rgbaFromImage(src image.Image) (out *image.RGBA) {
b := src.Bounds()
out = image.NewRGBA(b)
draw.Draw(out, b, src, b.Min, draw.Src)
return
}
func sortSequence(seq []color.Color) {
for i := 0; i < len(seq); {
runEnd := len(seq)
foundRun := false
for j := i; j < len(seq); j++ {
if luma(seq[j]) > threshold {
foundRun = true
i = j
for ; j < len(seq); j++ {
if luma(seq[j]) < threshold {
runEnd = j
break
}
}
break
}
}
if !foundRun {
break
}
run := seq[i:runEnd]
sort.Sort(SortableColors(run))
i = runEnd + 1
}
}
func pixelSort(img image.Image) image.Image {
rgba := rgbaFromImage(img)
b := rgba.Bounds()
if !*norow {
seq := make([]color.Color, b.Max.X)
for y := 0; y < b.Max.Y; y++ {
for i := range seq {
seq[i] = rgba.At(i, y)
}
sortSequence(seq)
for i := range seq {
rgba.Set(i, y, seq[i])
}
}
}
if !*nocol {
seq := make([]color.Color, b.Max.Y)
for x := 0; x < b.Max.X; x++ {
for i := range seq {
seq[i] = rgba.At(x, i)
}
sortSequence(seq)
for i := range seq {
rgba.Set(x, i, seq[i])
}
}
}
return rgba
}
func main() {
flag.Parse()
if len(flag.Args()) == 0 {
flag.Usage()
os.Exit(-1)
}
for _, input := range flag.Args() {
f, err := os.Open(input)
if err != nil {
fmt.Printf("Failed to open %s, %v\n", input, err)
os.Exit(-1)
}
img, format, err := image.Decode(f)
if err != nil {
fmt.Printf("Failed to decode %s, %v, %v\n", input, format, err)
os.Exit(-1)
}
for threshold = *minThreshold; threshold < *maxThreshold; threshold += *thresholdInc {
sortedImg := img
for i := 0; i < *passes; i++ {
sortedImg = pixelSort(sortedImg)
}
output := fmt.Sprintf("sorted_%dx_%fl_%s", *passes, threshold, input)
if format == "gif" {
output = fmt.Sprint(output[:3], "jpeg")
}
newFile, err := os.Create(output)
if err != nil {
fmt.Printf("Failed to write %s", output)
os.Exit(-1)
}
switch format {
case "jpeg":
jpeg.Encode(newFile, sortedImg, nil)
case "png":
png.Encode(newFile, sortedImg)
case "gif":
jpeg.Encode(newFile, sortedImg, nil)
default:
fmt.Printf("Unsupported image format %v\n", format)
os.Exit(-1)
}
}
}
}