ebiten/internal/devicescale/impl_unix.go

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// Copyright 2018 The Ebiten Authors
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//
// 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.
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// +build dragonfly freebsd linux netbsd openbsd solaris
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// +build !js
// +build !android
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package devicescale
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import (
"math"
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"os"
"os/exec"
"regexp"
"strconv"
"strings"
"sync/atomic"
"time"
)
type desktop int
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const (
desktopUnknown desktop = iota
desktopGnome
desktopCinnamon
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desktopUnity
desktopKDE
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desktopXfce
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)
var (
cachedScale uint64 // use atomic to read/write as multiple goroutines touch it.
cacheUpdateWait = time.Millisecond * 100
)
func init() {
go scaleUpdater()
}
func impl(x, y int) float64 {
return math.Float64frombits(atomic.LoadUint64(&cachedScale))
}
// run as goroutine. Will keep the desktop scale up to date.
// This can be removed once the scale change event is implemented in GLFW 3.3
func scaleUpdater() {
for {
s := getscale(0, 0)
atomic.StoreUint64(&cachedScale, math.Float64bits(s))
time.Sleep(cacheUpdateWait)
}
}
func currentDesktop() desktop {
tokens := strings.Split(os.Getenv("XDG_CURRENT_DESKTOP"), ":")
switch tokens[len(tokens)-1] {
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case "GNOME":
return desktopGnome
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case "X-Cinnamon":
return desktopCinnamon
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case "Unity":
return desktopUnity
case "KDE":
return desktopKDE
case "XFCE":
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return desktopXfce
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default:
return desktopUnknown
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}
}
var gsettingsRe = regexp.MustCompile(`\Auint32 (\d+)\s*\z`)
func gnomeScale() float64 {
out, err := exec.Command("gsettings", "get", "org.gnome.desktop.interface", "scaling-factor").Output()
if err != nil {
if err == exec.ErrNotFound {
return 0
}
if _, ok := err.(*exec.ExitError); ok {
return 0
}
panic(err)
}
m := gsettingsRe.FindStringSubmatch(string(out))
s, err := strconv.Atoi(m[1])
if err != nil {
return 0
}
return float64(s)
}
func cinnamonScale() float64 {
out, err := exec.Command("gsettings", "get", "org.cinnamon.desktop.interface", "scaling-factor").Output()
if err != nil {
if err == exec.ErrNotFound {
return 0
}
if _, ok := err.(*exec.ExitError); ok {
return 0
}
panic(err)
}
m := gsettingsRe.FindStringSubmatch(string(out))
s, err := strconv.Atoi(m[1])
if err != nil {
return 0
}
return float64(s)
}
func getscale(x, y int) float64 {
s := -1.0
switch currentDesktop() {
case desktopGnome:
// TODO: Support wayland and per-monitor scaling https://wiki.gnome.org/HowDoI/HiDpi
s = gnomeScale()
case desktopCinnamon:
s = cinnamonScale()
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case desktopUnity:
// TODO: Implement, supports per-monitor scaling
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case desktopKDE:
// TODO: Implement, appears to support per-monitor scaling
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case desktopXfce:
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// TODO: Implement
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}
if s <= 0 {
s = 1
}
return s
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}