mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-14 23:17:27 +01:00
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
// Copyright 2018 The Ebiten Authors
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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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// +build !js
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package devicescale
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// TODO: Use golang.org/x/sys/windows (NewLazyDLL) instead of cgo.
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// #cgo LDFLAGS: -lgdi32
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//
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// #include <windows.h>
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//
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// static char* getDPI(int* dpi) {
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// HDC dc = GetWindowDC(0);
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// *dpi = GetDeviceCaps(dc, LOGPIXELSX);
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// if (!ReleaseDC(0, dc)) {
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// return "ReleaseDC failed";
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// }
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// return "";
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// }
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import "C"
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import (
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"fmt"
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"syscall"
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)
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var (
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user32 = syscall.NewLazyDLL("user32")
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)
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var (
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procSetProcessDPIAware = user32.NewProc("SetProcessDPIAware")
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)
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func setProcessDPIAware() error {
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r, _, e := syscall.Syscall(procSetProcessDPIAware.Addr(), 0, 0, 0, 0)
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if e != 0 {
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return fmt.Errorf("devicescale: SetProcessDPIAware failed: error code: %d", e)
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}
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if r == 0 {
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return fmt.Errorf("devicescale: SetProcessDPIAware failed: returned value: %d", r)
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}
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return nil
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}
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func impl() float64 {
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if err := setProcessDPIAware(); err != nil {
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panic(err)
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}
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dpi := C.int(0)
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if errmsg := C.GoString(C.getDPI(&dpi)); errmsg != "" {
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panic(errmsg)
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}
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return float64(dpi) / 96
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}
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