65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
package generator
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import (
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"github.com/pkg/errors"
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"image"
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"image/color"
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"golang.org/x/image/font"
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"golang.org/x/image/font/basicfont"
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"golang.org/x/image/math/fixed"
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)
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var (
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errInvalidFormat = errors.New("invalid format")
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)
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func parseHexColorFast(s string) (color.RGBA, error) {
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var err error
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c := color.RGBA{}
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c.A = 0xff
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if s[0] != '#' {
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return c, errInvalidFormat
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}
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hexToByte := func(b byte) byte {
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switch {
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case b >= '0' && b <= '9':
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return b - '0'
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case b >= 'a' && b <= 'f':
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return b - 'a' + 10
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case b >= 'A' && b <= 'F':
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return b - 'A' + 10
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}
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err = errInvalidFormat
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return 0
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}
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switch len(s) {
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case 7:
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c.R = hexToByte(s[1])<<4 + hexToByte(s[2])
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c.G = hexToByte(s[3])<<4 + hexToByte(s[4])
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c.B = hexToByte(s[5])<<4 + hexToByte(s[6])
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case 4:
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c.R = hexToByte(s[1]) * 17
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c.G = hexToByte(s[2]) * 17
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c.B = hexToByte(s[3]) * 17
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default:
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err = errInvalidFormat
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}
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return c, err
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}
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func drawText(img *image.RGBA, x, y int, col color.RGBA, text string) {
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point := fixed.Point26_6{fixed.Int26_6(x * 64), fixed.Int26_6(y * 64)}
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d := &font.Drawer{
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Dst: img,
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Src: image.NewUniform(col),
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Face: basicfont.Face7x13,
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Dot: point,
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}
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d.DrawString(text)
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}
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