com.vaadin.testbench.screenshot.

Class ImageUtil


  • public class ImageUtil
extends Object

    These image utility functions are for internal use only.

    • Constructor Detail

      • ImageUtil

        public ImageUtil()

    • Method Detail

      • 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 -

        Returns:

      • imagesSameSize

        public static boolean imagesSameSize(BufferedImage image1,
                                     BufferedImage image2)

        Check canvas sizes and resize images to same size

        Returns:

        true/false

      • 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:

      • 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