//export onCreate
func onCreate(activity *C.ANativeActivity) {
config := C.AConfiguration_new()
C.AConfiguration_fromAssetManager(config, activity.assetManager)
density := C.AConfiguration_getDensity(config)
C.AConfiguration_delete(config)
var dpi int
switch density {
case C.ACONFIGURATION_DENSITY_DEFAULT:
dpi = 160
case C.ACONFIGURATION_DENSITY_LOW,
C.ACONFIGURATION_DENSITY_MEDIUM,
213, // C.ACONFIGURATION_DENSITY_TV
C.ACONFIGURATION_DENSITY_HIGH,
320, // ACONFIGURATION_DENSITY_XHIGH
480, // ACONFIGURATION_DENSITY_XXHIGH
640: // ACONFIGURATION_DENSITY_XXXHIGH
dpi = int(density)
case C.ACONFIGURATION_DENSITY_NONE:
log.Print("android device reports no screen density")
dpi = 72
default:
log.Print("android device reports unknown density: %d", density)
dpi = int(density) // This is a guess.
}
pixelsPerPt = float32(dpi) / 72
}
func windowConfigRead(activity *C.ANativeActivity) windowConfig {
aconfig := C.AConfiguration_new()
C.AConfiguration_fromAssetManager(aconfig, activity.assetManager)
orient := C.AConfiguration_getOrientation(aconfig)
density := C.AConfiguration_getDensity(aconfig)
C.AConfiguration_delete(aconfig)
// Calculate the screen resolution. This value is approximate. For example,
// a physical resolution of 200 DPI may be quantized to one of the
// ACONFIGURATION_DENSITY_XXX values such as 160 or 240.
//
// A more accurate DPI could possibly be calculated from
// https://developer.android.com/reference/android/util/DisplayMetrics.html#xdpi
// but this does not appear to be accessible via the NDK. In any case, the
// hardware might not even provide a more accurate number, as the system
// does not apparently use the reported value. See golang.org/issue/13366
// for a discussion.
var dpi int
switch density {
case C.ACONFIGURATION_DENSITY_DEFAULT:
dpi = 160
case C.ACONFIGURATION_DENSITY_LOW,
C.ACONFIGURATION_DENSITY_MEDIUM,
213, // C.ACONFIGURATION_DENSITY_TV
C.ACONFIGURATION_DENSITY_HIGH,
320, // ACONFIGURATION_DENSITY_XHIGH
480, // ACONFIGURATION_DENSITY_XXHIGH
640: // ACONFIGURATION_DENSITY_XXXHIGH
dpi = int(density)
case C.ACONFIGURATION_DENSITY_NONE:
log.Print("android device reports no screen density")
dpi = 72
default:
log.Printf("android device reports unknown density: %d", density)
// All we can do is guess.
if density > 0 {
dpi = int(density)
} else {
dpi = 72
}
}
o := size.OrientationUnknown
switch orient {
case C.ACONFIGURATION_ORIENTATION_PORT:
o = size.OrientationPortrait
case C.ACONFIGURATION_ORIENTATION_LAND:
o = size.OrientationLandscape
}
return windowConfig{
orientation: o,
pixelsPerPt: float32(dpi) / 72,
}
}
func windowConfigRead(activity *C.ANativeActivity) windowConfig {
aconfig := C.AConfiguration_new()
C.AConfiguration_fromAssetManager(aconfig, activity.assetManager)
orient := C.AConfiguration_getOrientation(aconfig)
density := C.AConfiguration_getDensity(aconfig)
C.AConfiguration_delete(aconfig)
var dpi int
switch density {
case C.ACONFIGURATION_DENSITY_DEFAULT:
dpi = 160
case C.ACONFIGURATION_DENSITY_LOW,
C.ACONFIGURATION_DENSITY_MEDIUM,
213, // C.ACONFIGURATION_DENSITY_TV
C.ACONFIGURATION_DENSITY_HIGH,
320, // ACONFIGURATION_DENSITY_XHIGH
480, // ACONFIGURATION_DENSITY_XXHIGH
640: // ACONFIGURATION_DENSITY_XXXHIGH
dpi = int(density)
case C.ACONFIGURATION_DENSITY_NONE:
log.Print("android device reports no screen density")
dpi = 72
default:
log.Printf("android device reports unknown density: %d", density)
// All we can do is guess.
if density > 0 {
dpi = int(density)
} else {
dpi = 72
}
}
o := size.OrientationUnknown
switch orient {
case C.ACONFIGURATION_ORIENTATION_PORT:
o = size.OrientationPortrait
case C.ACONFIGURATION_ORIENTATION_LAND:
o = size.OrientationLandscape
}
return windowConfig{
orientation: o,
pixelsPerPt: float32(dpi) / 72,
}
}