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ui: Use frame counter to update device scale

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This commit is contained in:
Hajime Hoshi 2018-10-02 03:21:59 +09:00
parent 78f2946797
commit fce82e1502
1 changed files with 4 additions and 6 deletions
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10
internal/ui/ui_glfw.go
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@ -52,6 +52,7 @@ type userInterface struct {
vsync bool
deviceScale float64
frame int64
deviceScaleUpdated int64
lastActualScale float64
@ -544,14 +545,10 @@ func (u *userInterface) getScale() float64 {
// actualScreenScale must be called from the main thread.
func (u *userInterface) actualScreenScale() float64 {
n := time.Now().UnixNano()
// As devicescale.DeviceScale accesses OS API, not call this too often.
//
// TODO: This function might return different values in one frame. Instead of using time, can we use frames
// or tick?
if u.deviceScale == 0 || n-u.deviceScaleUpdated > int64(time.Second/4) {
if u.deviceScale == 0 || u.frame-u.deviceScaleUpdated > 30 {
u.deviceScale = devicescale.DeviceScale()
u.deviceScaleUpdated = n
u.deviceScaleUpdated = u.frame
}
return u.getScale() * u.deviceScale
}
@ -643,6 +640,7 @@ func (u *userInterface) loop(g GraphicsContext) error {
}
u.m.Lock()
u.frame++
vsync := u.vsync
u.m.Unlock()