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examples/highdpi: Bug fix: doesn't work well on multiple monitors

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This commit is contained in:
Hajime Hoshi 2018-10-13 03:59:31 +09:00
parent 7f291b7bb1
commit 0fb33e7c36
1 changed files with 12 additions and 3 deletions
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15
examples/highdpi/main.go
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@ -29,6 +29,9 @@ var (
count int count int
highDPIImage *ebiten.Image highDPIImage *ebiten.Image
highDPIImageCh = make(chan *ebiten.Image) highDPIImageCh = make(chan *ebiten.Image)
// scale represents the device scale when the application starts.
scale = 1.0
) )
func init() { func init() {
@ -48,6 +51,10 @@ func init() {
} }
func update(screen *ebiten.Image) error { func update(screen *ebiten.Image) error {
// TODO: DeviceScaleFactor() might return different values for different monitors.
// Add a mode to adjust the screen size along with the current device scale (#705).
// Now this example uses the device scale initialized at the begining of this application.
if highDPIImage == nil { if highDPIImage == nil {
// Use select and 'default' clause for non-blocking receiving. // Use select and 'default' clause for non-blocking receiving.
select { select {
@ -66,7 +73,6 @@ func update(screen *ebiten.Image) error {
return nil return nil
} }
scale := ebiten.DeviceScaleFactor()
sw, sh := screen.Size() sw, sh := screen.Size()
w, h := highDPIImage.Size() w, h := highDPIImage.Size()
@ -88,7 +94,7 @@ func update(screen *ebiten.Image) error {
op.Filter = ebiten.FilterLinear op.Filter = ebiten.FilterLinear
screen.DrawImage(highDPIImage, op) screen.DrawImage(highDPIImage, op)
ebitenutil.DebugPrint(screen, fmt.Sprintf("Device Scale Ratio: %0.2f", scale)) ebitenutil.DebugPrint(screen, fmt.Sprintf("(Init) Device Scale Ratio: %0.2f", scale))
return nil return nil
} }
@ -99,7 +105,10 @@ func main() {
) )
// Pass the invert of scale so that Ebiten's auto scaling by device scale is disabled. // Pass the invert of scale so that Ebiten's auto scaling by device scale is disabled.
s := ebiten.DeviceScaleFactor() //
// Note that DeviceScaleFactor cannot be called from init() functions on some environments.
scale = ebiten.DeviceScaleFactor()
s := scale
if err := ebiten.Run(update, int(screenWidth*s), int(screenHeight*s), 1/s, "High DPI (Ebiten Demo)"); err != nil { if err := ebiten.Run(update, int(screenWidth*s), int(screenHeight*s), 1/s, "High DPI (Ebiten Demo)"); err != nil {
log.Fatal(err) log.Fatal(err)
} }