Example usage for javax.imageio ImageIO getImageWriters

Introduction

In this page you can find the example usage for javax.imageio ImageIO getImageWriters.

Prototype

public static Iterator<ImageWriter> getImageWriters(ImageTypeSpecifier type, String formatName) 

Source Link

Document

Returns an Iterator containing all currently registered ImageWriter s that claim to be able to encode images of the given layout (specified using an ImageTypeSpecifier ) in the given format.

Usage

From source file:lucee.runtime.img.Image.java

private void _writeOut(ImageOutputStream ios, String format, float quality, boolean noMeta)
        throws IOException, ExpressionException {
    if (quality < 0 || quality > 1)
        throw new IOException(
                "quality has an invalid value [" + quality + "], value has to be between 0 and 1");
    if (StringUtil.isEmpty(format))
        format = this.format;
    if (StringUtil.isEmpty(format))
        throw new IOException("missing format");

    BufferedImage im = image();// w w  w  .  jav a 2s.  c o  m

    //IIOMetadata meta = noMeta?null:metadata(format);
    IIOMetadata meta = noMeta ? null : getMetaData(null);

    ImageWriter writer = null;
    ImageTypeSpecifier type = ImageTypeSpecifier.createFromRenderedImage(im);
    Iterator<ImageWriter> iter = ImageIO.getImageWriters(type, format);

    if (iter.hasNext()) {
        writer = iter.next();
    }
    if (writer == null)
        throw new IOException("no writer for format [" + format + "] available, available writer formats are ["
                + ListUtil.arrayToList(ImageUtil.getWriterFormatNames(), ",") + "]");

    ImageWriteParam iwp = null;
    if ("jpg".equalsIgnoreCase(format)) {
        ColorModel cm = im.getColorModel();
        if (cm.hasAlpha())
            im = jpgImage(im);
        JPEGImageWriteParam jiwp = new JPEGImageWriteParam(Locale.getDefault());
        jiwp.setOptimizeHuffmanTables(true);
        iwp = jiwp;
    } else
        iwp = writer.getDefaultWriteParam();

    setCompressionModeEL(iwp, ImageWriteParam.MODE_EXPLICIT);
    setCompressionQualityEL(iwp, quality);
    writer.setOutput(ios);
    try {
        writer.write(meta, new IIOImage(im, null, meta), iwp);

    } finally {
        writer.dispose();
        ios.flush();
    }
}

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