Package com.vaadin.testbench.screenshot

Class ImageUtil

java.lang.Object

com.vaadin.testbench.screenshot.ImageUtil

public class ImageUtil
extends Object

These image utility functions are for internal use only.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ImageUtil.ImageProperties	Contains ImageUtil-internal information about an image.

Constructor Summary

Constructors

Constructor	Description
ImageUtil()

Method Summary

Modifier and Type	Method	Description
static BufferedImage	cloneImage(BufferedImage sourceImage)	Clones the given BufferedImage
static final int[]	createSampleBuffer()	Create a 16x16 sample buffer with space for 4 color bands
static List<BufferedImage>	cropToBeSameSize(BufferedImage image1, BufferedImage image2)	Resize images to be same size.
static String	encodeImageToBase64(BufferedImage image)	Encodes target image to a Base64 string
static final int[]	getBlock(ImageUtil.ImageProperties properties, int x, int y, int[] result, int[] sample)	Returns the 16x16 RGB block starting at (x,y) from the given image
static final ImageUtil.ImageProperties	getImageProperties(BufferedImage image)	Extract magical image properties used by the getBlock function.
static double	getLuminance(int rgb)	Get luminance value for the given rgb value.
static boolean	imagesSameSize(BufferedImage image1, BufferedImage image2)	Check canvas sizes and resize images to same size

Methods inherited from class java.lang.Object

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

Constructor Details

ImageUtil

public ImageUtil()

Method Details

encodeImageToBase64

public static String encodeImageToBase64(BufferedImage image)

Encodes target image to a Base64 string

Parameters:

image - BufferedImage to encode to String

Returns:

Base64 encoded String of image

getLuminance

public static double getLuminance(int rgb)

Get luminance value for the given rgb value.

Parameters:

rgb - value

Returns:

luminance of the rgb value

imagesSameSize

public static boolean imagesSameSize(BufferedImage image1,
 BufferedImage image2)

Check canvas sizes and resize images to same size

Parameters:

image1 - an image

image2 - an image

Returns:

true if images have same size, false otherwise

cropToBeSameSize

public static List<BufferedImage> cropToBeSameSize(BufferedImage image1,
 BufferedImage image2)

Resize images to be same size. The size is determined by the minimum height and minimum width of the images.

Parameters:

image1 - an image.

image2 - an image.

Returns:

a list containing two images with the same dimensions

createSampleBuffer

public static final int[] createSampleBuffer()

Create a 16x16 sample buffer with space for 4 color bands

Returns:

sample buffer int array

getImageProperties

public static final ImageUtil.ImageProperties getImageProperties(BufferedImage image)

Extract magical image properties used by the getBlock function.

Parameters:

image - a BufferedImage

Returns:

an ImageProperties descriptor object

getBlock

public static final int[] getBlock(ImageUtil.ImageProperties properties,
 int x,
 int y,
 int[] result,
 int[] sample)

Returns the 16x16 RGB block starting at (x,y) from the given image

Parameters:

properties - The properties of the image (image + metadata)

x - The x coordinate of the block (in pixels)

y - The y coordinate of the block (in pixels)

result - A sample buffer (32 bits per pixel) for storing the resulting block, or null (a new buffer will be created)

sample - A sample buffer for storing intermediate values, or null (a new buffer will be created). This parameter is provided mainly for speed (providing it eliminates unnecessary block allocations).

Returns:

An array of RGB values for the block

cloneImage

public static BufferedImage cloneImage(BufferedImage sourceImage)

Clones the given BufferedImage

Parameters:

sourceImage - The image to copy

Returns:

A copy of sourceImage