mirror of
https://git.sr.ht/~eliasnaur/gio
synced 2026-07-03 08:25:34 +00:00
Chris Waldon
0dfd8c3da6
This commit introduces a special mechanism to load only the regular version of the Go font. This is useful for Gio to load a font for drawing window decorations without forcing applications to load every Go font. Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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// Package gofont exports the Go fonts as a text.Collection.
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//
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// See https://blog.golang.org/go-fonts for a description of the
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// fonts, and the golang.org/x/image/font/gofont packages for the
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// font data.
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package gofont
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import (
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"fmt"
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"sync"
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"golang.org/x/image/font/gofont/gobold"
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"golang.org/x/image/font/gofont/gobolditalic"
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"golang.org/x/image/font/gofont/goitalic"
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"golang.org/x/image/font/gofont/gomedium"
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"golang.org/x/image/font/gofont/gomediumitalic"
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"golang.org/x/image/font/gofont/gomono"
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"golang.org/x/image/font/gofont/gomonobold"
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"golang.org/x/image/font/gofont/gomonobolditalic"
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"golang.org/x/image/font/gofont/gomonoitalic"
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"golang.org/x/image/font/gofont/goregular"
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"golang.org/x/image/font/gofont/gosmallcaps"
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"golang.org/x/image/font/gofont/gosmallcapsitalic"
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"gioui.org/font"
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"gioui.org/font/opentype"
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)
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var (
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regOnce sync.Once
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reg []font.FontFace
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once sync.Once
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collection []font.FontFace
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)
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func loadRegular() {
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regOnce.Do(func() {
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face, err := opentype.Parse(goregular.TTF)
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if err != nil {
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panic(fmt.Errorf("failed to parse font: %v", err))
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}
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reg = []font.FontFace{{Font: font.Font{Typeface: "Go"}, Face: face}}
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collection = append(collection, reg[0])
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})
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}
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// Regular returns a collection of only the Go regular font face.
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func Regular() []font.FontFace {
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loadRegular()
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return reg
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}
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// Regular returns a collection of all available Go font faces.
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func Collection() []font.FontFace {
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loadRegular()
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once.Do(func() {
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register(font.Font{Style: font.Italic}, goitalic.TTF)
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register(font.Font{Weight: font.Bold}, gobold.TTF)
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register(font.Font{Style: font.Italic, Weight: font.Bold}, gobolditalic.TTF)
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register(font.Font{Weight: font.Medium}, gomedium.TTF)
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register(font.Font{Weight: font.Medium, Style: font.Italic}, gomediumitalic.TTF)
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register(font.Font{Variant: "Mono"}, gomono.TTF)
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register(font.Font{Variant: "Mono", Weight: font.Bold}, gomonobold.TTF)
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register(font.Font{Variant: "Mono", Weight: font.Bold, Style: font.Italic}, gomonobolditalic.TTF)
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register(font.Font{Variant: "Mono", Style: font.Italic}, gomonoitalic.TTF)
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register(font.Font{Variant: "Smallcaps"}, gosmallcaps.TTF)
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register(font.Font{Variant: "Smallcaps", Style: font.Italic}, gosmallcapsitalic.TTF)
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// Ensure that any outside appends will not reuse the backing store.
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n := len(collection)
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collection = collection[:n:n]
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})
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return collection
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}
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func register(fnt font.Font, ttf []byte) {
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face, err := opentype.Parse(ttf)
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if err != nil {
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panic(fmt.Errorf("failed to parse font: %v", err))
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}
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fnt.Typeface = "Go"
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collection = append(collection, font.FontFace{Font: fnt, Face: face})
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}
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