/
text2image.go
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/
text2image.go
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package hal
/*
* Copyright 2016-2017 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Utilities to render text to an image. Useful for sending things like
// AsciiTable and Utf8Table to chat services that aren't consistent about
// fixed-width rendering. Might be fun for plugins too...
//
// A fixed-width font is embedded in this file to avoid depdending on external
// font files/paths.
//
// IBM VGA 8 font
// via http://int10h.org/oldschool-pc-fonts/
// Font License: Creative Commons Attribution-ShareAlike 4.0 International
//
// converted with a hacked-up version of dewinfont from
// http://www.chiark.greenend.org.uk/~sgtatham/fonts/dewinfont
//
// This could be smaller, etc. with tighter encoding but I wanted
// to keep the binascii encoding for easy tweaking.
import (
"image"
"image/color"
"image/draw"
"strconv"
"unicode/utf8"
)
// FontChar is a single character of the font.
// The Code field might go away. It was extracted from the original font
// and was flaky so I switched to using the UTF8-string to index and locate
// glyphs.
type FontChar struct {
String string // the UTF-8 single character
Code uint
Width uint
Value [16]uint8
}
// FontData is a font and its metadata.
type FontData struct {
Facename string
Height int
Width int
Ascent int
Pointsize int
Weight int
Charset int
r2char map[rune]FontChar // index for quick lookup
Chars [256]FontChar
}
// charRow converts a string representation of binary uint8 to uint8.
// This is a bit inefficient but it keeps the font easy to edit and
// it only needs to run once.
func charRow(in string) (out uint8) {
for i, r := range in {
if r == '1' {
out |= (1 << uint8(i))
}
}
return out
}
// StringToChars takes a string and returns the FontChar
func (fd *FontData) StringToChars(want string) []*FontChar {
runes := utf8.RuneCountInString(want)
out := make([]*FontChar, runes)
errr := fd.r2char['█']
i := 0
for _, r := range want {
if c, exists := fd.r2char[r]; exists {
out[i] = &c
} else {
// if the character is unknown, return a full block
out[i] = &errr
}
i++
}
return out
}
// StringToImages takes a string and returns a list of images
func (fd *FontData) StringToImages(want string, clr color.Color) []image.Image {
chars := fd.StringToChars(want)
out := make([]image.Image, len(chars))
rect := image.Rect(0, 0, fd.Width, fd.Height)
// TODO: maybe add a field to FontChar to cache or pregenerate the images
for i, c := range chars {
img := image.NewRGBA(rect)
var x uint
for y, row := range c.Value {
for x = 0; x < c.Width; x++ {
if row&uint8(1<<x) != 0 {
img.Set(int(x), y, clr)
}
}
}
out[i] = img
}
return out
}
// StringToImage takes a string and renders it to an image.Image.
// Newlines are not respected. See: StringsToImage().
func (fd *FontData) StringToImage(want string, clr color.Color) image.Image {
runes := utf8.RuneCountInString(want)
outrect := image.Rect(0, 0, fd.Width*runes, fd.Height)
out := image.NewRGBA(outrect)
chars := fd.StringToImages(want, clr)
for i, char := range chars {
sr := char.Bounds()
dp := image.Pt(i*fd.Width, 0)
r := image.Rectangle{dp, dp.Add(sr.Size())}
draw.Draw(out, r, char, sr.Min, draw.Src)
}
return out
}
// StringsToImage renders an array of strings to an image, with each row in
// the provided list as a line. The image size is dependent on the text
// passed in.
func (fd *FontData) StringsToImage(want []string, clr color.Color) image.Image {
var max int
for _, str := range want {
runes := utf8.RuneCountInString(str)
if runes > max {
max = runes
}
}
width := max * fd.Width
height := len(want) * fd.Height
size := image.Rect(0, 0, width, height)
out := image.NewRGBA(size)
for y, str := range want {
row := fd.StringToImage(str, clr)
sr := row.Bounds()
dp := image.Pt(0, y*fd.Height)
r := image.Rectangle{dp, dp.Add(sr.Size())}
draw.Draw(out, r, row, sr.Min, draw.Src)
}
return out
}
// FixedFont returns a handle for the embedded 8x16 VGA font.
func FixedFont() *FontData {
fd := FontData{
Facename: "Bm437 IBM VGA8",
Height: 16,
Width: 8,
Ascent: 12,
Pointsize: 12,
Weight: 400,
Charset: 255,
}
fd.Chars = [256]FontChar{
FontChar{
String: string('\u0000'),
Code: 0x0000,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "☺",
Code: 0x0001,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("01111110"),
charRow("10000001"),
charRow("10100101"),
charRow("10000001"),
charRow("10000001"),
charRow("10111101"),
charRow("10011001"),
charRow("10000001"),
charRow("10000001"),
charRow("01111110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "☻",
Code: 0x0002,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("01111110"),
charRow("11111111"),
charRow("11011011"),
charRow("11111111"),
charRow("11111111"),
charRow("11000011"),
charRow("11100111"),
charRow("11111111"),
charRow("11111111"),
charRow("01111110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♥",
Code: 0x0003,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("01101100"),
charRow("11111110"),
charRow("11111110"),
charRow("11111110"),
charRow("11111110"),
charRow("01111100"),
charRow("00111000"),
charRow("00010000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♦",
Code: 0x0004,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00010000"),
charRow("00111000"),
charRow("01111100"),
charRow("11111110"),
charRow("01111100"),
charRow("00111000"),
charRow("00010000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♣",
Code: 0x0005,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("00111100"),
charRow("11100111"),
charRow("11100111"),
charRow("11100111"),
charRow("00011000"),
charRow("00011000"),
charRow("00111100"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♠",
Code: 0x0006,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("01111110"),
charRow("11111111"),
charRow("11111111"),
charRow("01111110"),
charRow("00011000"),
charRow("00011000"),
charRow("00111100"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "•",
Code: 0x0007,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("00111100"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "◘",
Code: 0x0008,
Width: 8,
Value: [16]uint8{
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11100111"),
charRow("11000011"),
charRow("11000011"),
charRow("11100111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
},
},
FontChar{
String: "○",
Code: 0x0009,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00111100"),
charRow("01100110"),
charRow("01000010"),
charRow("01000010"),
charRow("01100110"),
charRow("00111100"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♂",
Code: 0x000A,
Width: 8,
Value: [16]uint8{
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11000011"),
charRow("10011001"),
charRow("10111101"),
charRow("10111101"),
charRow("10011001"),
charRow("11000011"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
charRow("11111111"),
},
},
FontChar{
String: "♀",
Code: 0x000B,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00011110"),
charRow("00001110"),
charRow("00011010"),
charRow("00110010"),
charRow("01111000"),
charRow("11001100"),
charRow("11001100"),
charRow("11001100"),
charRow("11001100"),
charRow("01111000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♀",
Code: 0x000C,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00111100"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("00111100"),
charRow("00011000"),
charRow("01111110"),
charRow("00011000"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♪",
Code: 0x000D,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00111111"),
charRow("00110011"),
charRow("00111111"),
charRow("00110000"),
charRow("00110000"),
charRow("00110000"),
charRow("00110000"),
charRow("01110000"),
charRow("11110000"),
charRow("11100000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "♫",
Code: 0x000E,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("01111111"),
charRow("01100011"),
charRow("01111111"),
charRow("01100011"),
charRow("01100011"),
charRow("01100011"),
charRow("01100011"),
charRow("01100111"),
charRow("11100111"),
charRow("11100110"),
charRow("11000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "☼",
Code: 0x000F,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00011000"),
charRow("11011011"),
charRow("00111100"),
charRow("11100111"),
charRow("00111100"),
charRow("11011011"),
charRow("00011000"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "►",
Code: 0x0010,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("10000000"),
charRow("11000000"),
charRow("11100000"),
charRow("11110000"),
charRow("11111000"),
charRow("11111110"),
charRow("11111000"),
charRow("11110000"),
charRow("11100000"),
charRow("11000000"),
charRow("10000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "◄",
Code: 0x0011,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000010"),
charRow("00000110"),
charRow("00001110"),
charRow("00011110"),
charRow("00111110"),
charRow("11111110"),
charRow("00111110"),
charRow("00011110"),
charRow("00001110"),
charRow("00000110"),
charRow("00000010"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "↕",
Code: 0x0012,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("01111110"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("01111110"),
charRow("00111100"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "‼",
Code: 0x0013,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("00000000"),
charRow("01100110"),
charRow("01100110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "¶",
Code: 0x0014,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("01111111"),
charRow("11011011"),
charRow("11011011"),
charRow("11011011"),
charRow("01111011"),
charRow("00011011"),
charRow("00011011"),
charRow("00011011"),
charRow("00011011"),
charRow("00011011"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "§",
Code: 0x0015,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("01111100"),
charRow("11000110"),
charRow("01100000"),
charRow("00111000"),
charRow("01101100"),
charRow("11000110"),
charRow("11000110"),
charRow("01101100"),
charRow("00111000"),
charRow("00001100"),
charRow("11000110"),
charRow("01111100"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "▬",
Code: 0x0016,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("11111110"),
charRow("11111110"),
charRow("11111110"),
charRow("11111110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "↨",
Code: 0x0017,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("01111110"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("01111110"),
charRow("00111100"),
charRow("00011000"),
charRow("01111110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "↑",
Code: 0x0018,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("01111110"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "↓",
Code: 0x0019,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("01111110"),
charRow("00111100"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "→",
Code: 0x001A,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00001100"),
charRow("11111110"),
charRow("00001100"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "←",
Code: 0x001B,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00110000"),
charRow("01100000"),
charRow("11111110"),
charRow("01100000"),
charRow("00110000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "∟",
Code: 0x001C,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("11000000"),
charRow("11000000"),
charRow("11000000"),
charRow("11111110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "↔",
Code: 0x001D,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00101000"),
charRow("01101100"),
charRow("11111110"),
charRow("01101100"),
charRow("00101000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "▲",
Code: 0x001E,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00010000"),
charRow("00111000"),
charRow("00111000"),
charRow("01111100"),
charRow("01111100"),
charRow("11111110"),
charRow("11111110"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "▼",
Code: 0x001F,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("11111110"),
charRow("11111110"),
charRow("01111100"),
charRow("01111100"),
charRow("00111000"),
charRow("00111000"),
charRow("00010000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: " ",
Code: 0x0020,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "!",
Code: 0x0021,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00011000"),
charRow("00111100"),
charRow("00111100"),
charRow("00111100"),
charRow("00011000"),
charRow("00011000"),
charRow("00011000"),
charRow("00000000"),
charRow("00011000"),
charRow("00011000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "\"",
Code: 0x0022,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("01100110"),
charRow("01100110"),
charRow("01100110"),
charRow("00100100"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
},
},
FontChar{
String: "#",
Code: 0x0023,
Width: 8,
Value: [16]uint8{
charRow("00000000"),
charRow("00000000"),
charRow("00000000"),
charRow("01101100"),