golang-image/font/basicfont/gen.go

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// This program generates data.go.
package main
import (
"bytes"
"fmt"
"go/format"
"image"
"image/draw"
"io/ioutil"
"log"
"path"
"path/filepath"
"golang.org/x/image/font"
"golang.org/x/image/font/plan9font"
"golang.org/x/image/math/fixed"
)
func main() {
// nGlyphs is the number of glyphs to generate: 95 characters in the range
// [0x20, 0x7e], plus the replacement character.
const nGlyphs = 95 + 1
// The particular font (unicode.7x13.font) leaves the right-most column
// empty in its ASCII glyphs. We don't have to include that column in the
// generated glyphs, so we subtract one off the effective width.
const width, height, ascent = 7 - 1, 13, 11
readFile := func(name string) ([]byte, error) {
return ioutil.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
}
fontData, err := readFile("unicode.7x13.font")
if err != nil {
log.Fatalf("readFile: %v", err)
}
face, err := plan9font.ParseFont(fontData, readFile)
if err != nil {
log.Fatalf("plan9font.ParseFont: %v", err)
}
dst := image.NewRGBA(image.Rect(0, 0, width, nGlyphs*height))
draw.Draw(dst, dst.Bounds(), image.Black, image.Point{}, draw.Src)
d := &font.Drawer{
Dst: dst,
Src: image.White,
Face: face,
}
for i := 0; i < nGlyphs; i++ {
r := '\ufffd'
if i < nGlyphs-1 {
r = 0x20 + rune(i)
}
d.Dot = fixed.P(0, height*i+ascent)
d.DrawString(string(r))
}
w := bytes.NewBuffer(nil)
w.WriteString(preamble)
fmt.Fprintf(w, "// mask7x13 contains %d %d×%d glyphs in %d Pix bytes.\n", nGlyphs, width, height, nGlyphs*width*height)
fmt.Fprintf(w, "var mask7x13 = &image.Alpha{\n")
fmt.Fprintf(w, " Stride: %d,\n", width)
fmt.Fprintf(w, " Rect: image.Rectangle{Max: image.Point{%d, %d*%d}},\n", width, nGlyphs, height)
fmt.Fprintf(w, " Pix: []byte{\n")
b := dst.Bounds()
for y := b.Min.Y; y < b.Max.Y; y++ {
if y%height == 0 {
if y != 0 {
w.WriteByte('\n')
}
i := y / height
if i < nGlyphs-1 {
i += 0x20
fmt.Fprintf(w, "// %#2x %q\n", i, rune(i))
} else {
fmt.Fprintf(w, "// U+FFFD REPLACEMENT CHARACTER\n")
}
}
for x := b.Min.X; x < b.Max.X; x++ {
if dst.RGBAAt(x, y).R > 0 {
w.WriteString("0xff,")
} else {
w.WriteString("0x00,")
}
}
w.WriteByte('\n')
}
w.WriteString("},\n}\n")
fmted, err := format.Source(w.Bytes())
if err != nil {
log.Fatalf("format.Source: %v", err)
}
if err := ioutil.WriteFile("data.go", fmted, 0644); err != nil {
log.Fatalf("ioutil.WriteFile: %v", err)
}
}
const preamble = `// generated by go generate; DO NOT EDIT.
package basicfont
// This data is derived from files in the font/fixed directory of the Plan 9
// Port source code (https://github.com/9fans/plan9port) which were originally
// based on the public domain X11 misc-fixed font files.
import "image"
`