mirror of
https://github.com/hajimehoshi/ebiten.git
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50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ui
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import (
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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)
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var scalingFactorSyntax = regexp.MustCompile(`\Auint32\s+(\d+)\s*\z`)
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var deviceScaleFactor = 0
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// adjustScaleForGLFW adjusts the given scale which is passed to the GLFW API.
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func adjustScaleForGLFW(scale int) int {
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if 0 < deviceScaleFactor {
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return scale * deviceScaleFactor
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}
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// Execute gsettings command instead of calling gtk functions so as not to depend on
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// gobject-2.0 library.
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c := exec.Command("gsettings", "get", "org.gnome.desktop.interface", "scaling-factor")
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o, err := c.Output()
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if err != nil {
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panic(fmt.Sprintf("ui: executing gsettings error %v", err))
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}
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m := scalingFactorSyntax.FindStringSubmatch(string(o))
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if m == nil {
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panic("ui: gsettings result syntax is not expected")
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}
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s, err := strconv.Atoi(m[1])
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if err != nil {
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panic(fmt.Sprintf("ui: %v", err))
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}
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deviceScaleFactor = s
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return scale * deviceScaleFactor
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}
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