com.groupdocs.editor.htmlcss.resources.images.raster

Class PngImage

    • Constructor Detail

      • PngImage

        public PngImage(String name,
                        InputStream binaryContent)

        Creates new PngImage instance from content, represented as byte stream, and with specified name

        Parameters:
        name - Name of the PNG image. Cannot be null, empty or whitespaces.
        binaryContent - Content as byte stream. Reading begins from original position. Cannot be null. Should be readable and seekable. If this instance will be disposed, this stream will be disposed too.
        Throws:
        IllegalArgumentException
        InvalidImageFormatException
      • PngImage

        public PngImage(String name,
                        String contentInBase64)

        Creates new PngImage instance from content, represented as base64-encoded string, and with specified name

        Parameters:
        name - Name of the PNG image. Cannot be null, empty or whitespaces.
        contentInBase64 - Content as base64-encoded string. Cannot be null, empty or whitespaces. If it is not a PNG content, exception will be thrown.
        Throws:
        IllegalArgumentException
        InvalidImageFormatException
    • Method Detail

      • isValid

        public static boolean isValid(InputStream binaryContent)

        Checks whether specified stream is a valid PNG image

        Parameters:
        binaryContent - Byte stream, that presumably contains a PNG image
        Returns:
        True if specified stream contains valid PNG image, false otherwise
      • isValid

        public static boolean isValid(String contentInBase64)

        Checks whether specified base64-encoded string is a valid PNG image

        Parameters:
        contentInBase64 - Content of the presumably PNG image in a form of base64-encoded string
        Returns:
        True if specified string contains valid PNG image, false otherwise
      • reduceToNewHeight

        public final PngImage reduceToNewHeight(int targetHeightInPixels)

        Creates and returns a new reduced PNG image, but with specified new reduced height and proportionally reduced width.

        Overrides:
        reduceToNewHeight in class RasterImageResourceBase
        Parameters:
        targetHeightInPixels - Height of the desired PNG image in pixels. Should be strictly lesser than original height.
        Returns:
        New PngImage instance with specified height