forked from fogleman/gg
/
util.go
117 lines (103 loc) · 2.11 KB
/
util.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
package gg
import (
"fmt"
"image"
"image/draw"
_ "image/jpeg"
"image/png"
"io/ioutil"
"math"
"os"
"strings"
"github.com/golang/freetype/truetype"
"golang.org/x/image/font"
"golang.org/x/image/math/fixed"
)
func Radians(degrees float64) float64 {
return degrees * math.Pi / 180
}
func Degrees(radians float64) float64 {
return radians * 180 / math.Pi
}
func LoadImage(path string) (image.Image, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
im, _, err := image.Decode(file)
return im, err
}
func LoadPNG(path string) (image.Image, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
return png.Decode(file)
}
func SavePNG(path string, im image.Image) error {
file, err := os.Create(path)
if err != nil {
return err
}
defer file.Close()
return png.Encode(file, im)
}
func imageToRGBA(src image.Image) *image.RGBA {
dst := image.NewRGBA(src.Bounds())
draw.Draw(dst, dst.Rect, src, image.ZP, draw.Src)
return dst
}
func parseHexColor(x string) (r, g, b, a int) {
x = strings.TrimPrefix(x, "#")
a = 255
if len(x) == 3 {
format := "%1x%1x%1x"
fmt.Sscanf(x, format, &r, &g, &b)
r |= r << 4
g |= g << 4
b |= b << 4
}
if len(x) == 6 {
format := "%02x%02x%02x"
fmt.Sscanf(x, format, &r, &g, &b)
}
if len(x) == 8 {
format := "%02x%02x%02x%02x"
fmt.Sscanf(x, format, &r, &g, &b, &a)
}
return
}
func fixp(x, y float64) fixed.Point26_6 {
return fixed.Point26_6{fix(x), fix(y)}
}
func fix(x float64) fixed.Int26_6 {
return fixed.Int26_6(x * 64)
}
func unfix(x fixed.Int26_6) float64 {
const shift, mask = 6, 1<<6 - 1
if x >= 0 {
return float64(x>>shift) + float64(x&mask)/64
}
x = -x
if x >= 0 {
return -(float64(x>>shift) + float64(x&mask)/64)
}
return 0
}
func LoadFontFace(path string, points float64) (font.Face, error) {
fontBytes, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
f, err := truetype.Parse(fontBytes)
if err != nil {
return nil, err
}
face := truetype.NewFace(f, &truetype.Options{
Size: points,
// Hinting: font.HintingFull,
})
return face, nil
}