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impl_unix.go
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/
impl_unix.go
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// Copyright 2018 The Ebiten Authors
//
// 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.
// +build dragonfly freebsd linux netbsd openbsd solaris
// +build !js
// +build !android
package devicescale
import (
"os"
"os/exec"
"regexp"
"strconv"
"strings"
)
type desktop int
const (
desktopUnknown desktop = iota
desktopGnome
desktopCinnamon
desktopUnity
desktopKDE
desktopXfce
)
func currentDesktop() desktop {
tokens := strings.Split(os.Getenv("XDG_CURRENT_DESKTOP"), ":")
switch tokens[len(tokens)-1] {
case "GNOME":
return desktopGnome
case "X-Cinnamon":
return desktopCinnamon
case "Unity":
return desktopUnity
case "KDE":
return desktopKDE
case "XFCE":
return desktopXfce
default:
return desktopUnknown
}
}
var gsettingsRe = regexp.MustCompile(`\Auint32 (\d+)\s*\z`)
func gnomeScale() float64 {
// TODO: Should 'monitors.xml' be loaded?
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 impl(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()
case desktopUnity:
// TODO: Implement, supports per-monitor scaling
case desktopKDE:
// TODO: Implement, appears to support per-monitor scaling
case desktopXfce:
// TODO: Implement
}
if s <= 0 {
s = 1
}
return s
}