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ui: More accurate device scale factor

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This commit is contained in:
Hajime Hoshi 2016-06-19 05:04:38 +09:00
parent 7528977842
commit ea377b8e20
4 changed files with 80 additions and 9 deletions
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10
internal/ui/ui_glfw.go
View File

@ -147,16 +147,8 @@ func (u *userInterface) Start(width, height, scale int, title string) error {
m := glfw.GetPrimaryMonitor()
v := m.GetVideoMode()
mw, _ := m.GetPhysicalSize()
u.deviceScale = 1
u.deviceScale = deviceScale()
u.framebufferScale = 1
// mw can be 0 on some environment like Linux VM
if 0 < mw {
dpi := float64(v.Width) * 25.4 / float64(mw)
u.deviceScale = dpi / 96
if u.deviceScale < 1 {
u.deviceScale = 1
}
}
if !u.setScreenSize(width, height, scale) {
err = errors.New("ui: Fail to set the screen size")

22
internal/ui/ui_linux.go Normal file
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@ -0,0 +1,22 @@
// Copyright 2016 Hajime Hoshi
//
// 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 !js
package ui
func deviceScale() float64 {
// TODO: Implement this
return 1
}

25
internal/ui/ui_mac.go Normal file
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@ -0,0 +1,25 @@
// Copyright 2016 Hajime Hoshi
//
// 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 darwin,!arm,!arm64
// +build !js
// +build !ios
package ui
func deviceScale() float64 {
// The device scale is always 1 on Mac OS.
// The frame buffer size is different from the window size.
return 1
}

32
internal/ui/ui_windows.go Normal file
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@ -0,0 +1,32 @@
// Copyright 2016 Hajime Hoshi
//
// 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 !js
package ui
// #cgo LDFLAGS: -lgdi32
//
// #include <windows.h>
//
// static int getDPI() {
// HDC dc = GetWindowDC(0);
// return GetDeviceCaps(dc, LOGPIXELSX);
// }
import "C"
func deviceScale() float64 {
dpi := int(C.getDPI())
return float64(dpi) / 96
}