Package com.journeyapps.barcodescanner.camera

Class DisplayConfiguration

java.lang.Object

com.journeyapps.barcodescanner.camera.DisplayConfiguration

public class DisplayConfiguration
extends Object

Constructor Summary

Constructors

Constructor	Description
DisplayConfiguration(int rotation)
DisplayConfiguration(int rotation, Size viewfinderSize)

Method Summary

Modifier and Type	Method	Description
Size	getBestPreviewSize(List<Size> sizes, boolean isRotated)	Choose the best preview size, based on our display size.
Size	getDesiredPreviewSize(boolean rotate)
PreviewScalingStrategy	getPreviewScalingStrategy()
int	getRotation()
Size	getViewfinderSize()
Rect	scalePreview(Size previewSize)	Scale the preview to cover the viewfinder, then center it.
void	setPreviewScalingStrategy(PreviewScalingStrategy previewScalingStrategy)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DisplayConfiguration

public DisplayConfiguration(int rotation)

DisplayConfiguration

public DisplayConfiguration(int rotation,
                            Size viewfinderSize)

Method Detail

getRotation

public int getRotation()

getViewfinderSize

public Size getViewfinderSize()

getPreviewScalingStrategy

public PreviewScalingStrategy getPreviewScalingStrategy()

setPreviewScalingStrategy

public void setPreviewScalingStrategy(PreviewScalingStrategy previewScalingStrategy)

getDesiredPreviewSize

public Size getDesiredPreviewSize(boolean rotate)

Parameters:

rotate - true to rotate the preview size

Returns:

desired preview size in natural camera orientation.

getBestPreviewSize

public Size getBestPreviewSize(List<Size> sizes,
                               boolean isRotated)

Choose the best preview size, based on our display size. We prefer: 1. no scaling 2. least downscaling 3. least upscaling We do not care much about aspect ratio, since we just crop away extra pixels. We only choose the size to minimize scaling. In the future we may consider choosing the biggest possible preview size, to maximize the resolution we have for decoding. We need more testing to see whether or not that is feasible.

Parameters:

sizes - supported preview sizes, containing at least one size. Sizes are in natural camera orientation.

isRotated - true if the camera is rotated perpendicular to the current display orientation

Returns:

the best preview size, never null

scalePreview

public Rect scalePreview(Size previewSize)

Scale the preview to cover the viewfinder, then center it. Aspect ratio is preserved.

Parameters:

previewSize - the size of the preview (camera), in current display orientation

Returns:

a rect placing the preview