[jira] [Updated] (FOP-2512) java.lang.NullPointerException: Parameter alpha must not be null

["Stefan Quandt (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FOP-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Quandt updated FOP-2512:
-------------------------------
    Attachment: 22x22.png
                19x13.png
                16x16.png

Three examples PNGs which cannot be processed by fop.

> java.lang.NullPointerException: Parameter alpha must not be null
> ----------------------------------------------------------------
>
>                 Key: FOP-2512
>                 URL: https://issues.apache.org/jira/browse/FOP-2512
>             Project: FOP
>          Issue Type: Bug
>    Affects Versions: 2.0
>            Reporter: Mathieu Malaterre
>         Attachments: 16x16.png, 19x13.png, 22x22.png
>
>
> fop is not capable of dealing with some PNG, it keeps on failing with:
> Error while rendering page 9
> java.lang.NullPointerException: Parameter alpha must not be null
> Exception
> java.lang.NullPointerException: Parameter alpha must not be null
> Input is:
> $ pnginfo test.png
> test.png...
>   Image Width: 411 Image Length: 225
>   Bitdepth (Bits/Sample): 8
>   Channels (Samples/Pixel): 1
>   Pixel depth (Pixel Depth): 8
>   Colour Type (Photometric Interpretation): PALETTED COLOUR with alpha (18 colours, 17 transparent) 
>   Image filter: Single row per byte filter 
>   Interlacing: No interlacing 
>   Compression Scheme: Deflate method 8, 32k window
>   Resolution: 0, 0 (unit unknown)
>   FillOrder: msb-to-lsb
>   Byte Order: Network (Big Endian)
>   Number of text strings: 0 of 0



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Re: [jira] [Updated] (FOP-2512) java.lang.NullPointerException: Parameter alpha must not be null

["dvineshkumar@gmail.com" <dv...@gmail.com>]

Update the AlphaRasterImage class constructor like below to fix the issue. 

Existing: 
=====

public AlphaRasterImage(String k, RenderedImage image) {
        this(k, GraphicsUtil.getAlphaRaster(image));
    }

Updated:
=====
/**
     * Create a alpha channel image.
     * Extracts the alpha channel from the RenderedImage and creates a new
bitmap image
     * with the given data.
     *
     * @param k the key to be used to lookup the image
     * @param image the image (must have an alpha channel)
     */
    public AlphaRasterImage(String k, RenderedImage image) {
        this(k, getAlphaRaster(image));
    }

    /**
     *  
     *
     * Fix for Alpha Raster Image Issue.
     *
     * Extracts the Alpha Raster for the given image.
     *
     */
    private static java.awt.image.Raster getAlphaRaster(RenderedImage image)
    {
    	java.awt.image.Raster alphaRaster = GraphicsUtil.getAlphaRaster(image);

    	/*
    	 * If alphaRaster is null from the above call, then create the image
with
    	 * alpha channel and return the alphaRaster.
    	 */
        if (alphaRaster == null)
        {
        	BufferedImage bufferedImage = (BufferedImage)image;
        	int w = bufferedImage.getWidth();
            int h = bufferedImage.getHeight();
            int type = BufferedImage.TYPE_INT_ARGB;
            BufferedImage bia = new BufferedImage(w,h,type);
            Graphics2D g = bia.createGraphics();
            ImageObserver imo = null;
            g.drawImage(bufferedImage, 0, 0, imo);
            g.dispose();
            alphaRaster = GraphicsUtil.getAlphaRaster(bia);
        }
        return alphaRaster;
    }




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