Package eu.europa.esig.dss.pdf.visible

Class ImageUtils

java.lang.Object

eu.europa.esig.dss.pdf.visible.ImageUtils

public class ImageUtils
extends Object

Static utilities that helps in creating ImageAndResolution

Author:

pakeyser

Method Summary

Modifier and Type	Method	Description
static Dimension	getImageDimension(SignatureImageParameters imageParameters)	Returns Dimensions.
static int	getImageType(BufferedImage image)
static float	getScaleFactor(int zoom)	Returns a coefficient applying to a signature field width/height calculation
static boolean	isTransparent(BufferedImage bufferedImage)
static BufferedImage	read(InputStream is)	Reads image from InputStream.
static ImageAndResolution	readDisplayMetadata(DSSDocument image)	Reads image's metadata
static BufferedImage	rotate(BufferedImage image, double angle)
static ImageAndResolution	secureReadMetadata(SignatureImageParameters imageParameters)	Reads image's metadata in a secure way.

Methods inherited from class java.lang.Object

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

Method Details

secureReadMetadata

public static ImageAndResolution secureReadMetadata(SignatureImageParameters imageParameters) throws IOException

Reads image's metadata in a secure way. If metadata is not accessible from image, returns values from imageParameters

Parameters:

imageParameters - SignatureImageParameters

Returns:

ImageAndResolution metadata

Throws:

IOException - in case of image reading error

readDisplayMetadata

public static ImageAndResolution readDisplayMetadata(DSSDocument image) throws IOException

Reads image's metadata

Parameters:

image - DSSDocument image to read metadata from

Returns:

ImageAndResolution metadata

Throws:

IOException - in case of image reading error

getImageDimension

public static Dimension getImageDimension(SignatureImageParameters imageParameters)

Returns Dimensions. Tries to retrieve explicetly set values in the parameters, in other case reads dimensions from the provided image

Parameters:

imageParameters - SignatureImageParameters

Returns:

Dimension

getScaleFactor

public static float getScaleFactor(int zoom)

Returns a coefficient applying to a signature field width/height calculation

Parameters:

zoom - - zoom value to compute scale factor from

Returns:

float scale factor

read

public static BufferedImage read(InputStream is) throws IOException

Reads image from InputStream. Detects and converts CMYK images to RGB if needed

Parameters:

is - InputStream to read the image from

Returns:

BufferedImage

Throws:

IOException - - in case of InputStream reading error

rotate

public static BufferedImage rotate(BufferedImage image, double angle)

isTransparent

public static boolean isTransparent(BufferedImage bufferedImage)

getImageType

public static int getImageType(BufferedImage image)