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