ebiten/internal/devicescale/cinnamon_unix.go

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// Copyright 2020 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 (
"encoding/xml"
"os"
"os/exec"
"path/filepath"
"strconv"
"github.com/hajimehoshi/ebiten/internal/glfw"
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)
type xmlBool bool
func (b *xmlBool) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
var s string
if err := d.DecodeElement(&s, &start); err != nil {
return err
}
*b = xmlBool(s == "yes")
return nil
}
type cinnamonMonitors struct {
XMLName xml.Name `xml:"monitors"`
Version string `xml:"version,attr"`
Configuration []cinnamonMonitorsConfiguration `xml:"configuration"`
}
type cinnamonMonitorsConfiguration struct {
BaseScale float64 `xml:"base_scale"`
Output []struct {
X int `xml:"x"`
Y int `xml:"y"`
Width int `xml:"width"`
Height int `xml:"height"`
Scale float64 `xml:"scale"`
Primary xmlBool `xml:"primary"`
} `xml:"output"`
}
func (c *cinnamonMonitorsConfiguration) matchesWithGLFWMonitors(monitors []*glfw.Monitor) bool {
type area struct {
X, Y, Width, Height int
}
areas := map[area]struct{}{}
for _, o := range c.Output {
if o.Width == 0 || o.Height == 0 {
continue
}
areas[area{
X: o.X,
Y: o.Y,
Width: o.Width,
Height: o.Height,
}] = struct{}{}
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}
if len(areas) != len(monitors) {
return false
}
for _, m := range monitors {
x, y := m.GetPos()
v := m.GetVideoMode()
a := area{
X: x,
Y: y,
Width: v.Width,
Height: v.Height,
}
if _, ok := areas[a]; !ok {
return false
}
}
return true
}
func cinnamonScaleFromXML() (float64, error) {
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home, err := os.UserHomeDir()
if err != nil {
return 0, err
}
f, err := os.Open(filepath.Join(home, ".config", "cinnamon-monitors.xml"))
if err != nil {
return 0, err
}
defer f.Close()
d := xml.NewDecoder(f)
var monitors cinnamonMonitors
if err = d.Decode(&monitors); err != nil {
return 0, err
}
for _, c := range monitors.Configuration {
if !c.matchesWithGLFWMonitors(glfw.GetMonitors()) {
continue
}
for _, v := range c.Output {
// TODO: Get the monitor at the specified position.
// TODO: Consider the base scale?
if v.Primary && v.Scale != 0.0 {
return v.Scale, nil
}
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}
}
return 0, nil
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}
func cinnamonScale() float64 {
if s, err := cinnamonScaleFromXML(); err == nil && s > 0 {
return s
}
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)
}