Example usage for javax.imageio ImageReadParam canSetSourceRenderSize

Introduction

In this page you can find the example usage for javax.imageio ImageReadParam canSetSourceRenderSize.

Prototype

boolean canSetSourceRenderSize

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Document

true if this ImageReadParam allows the source rendering dimensions to be set.

Usage

From source file:org.jimcat.services.imagemanager.ImageUtil.java

/**
 * use this methode to load an image from a given byte array
 * //  w  ww .  jav  a2  s  .c o  m
 * @param data -
 *            the byte array containing an encoded image
 * @param quality
 *            the rendering quality
 * @return - a Buffered Image containing image. Its size is limited by
 *         SOURCE_BOUNDING_BOX constant
 * @throws IOException -
 *             if something goes wrong
 */
public static BufferedImage loadImage(byte[] data, ImageQuality quality) throws IOException {

    // read first element
    ImageReader reader = getReaderForImage(data);

    // get image dimension and calculate resulting image size
    int width = reader.getWidth(0);
    int height = reader.getHeight(0);
    Dimension size = getScaledDimension(width, height, SOURCE_BOUNDING_BOX, false);

    // performe read
    BufferedImage bi = null;
    try {
        if (USE_TILES) {
            // if image is smaller than a tile
            if (width <= IMAGE_TILE_SIZE.width && height <= IMAGE_TILE_SIZE.height) {
                bi = reader.read(0);
            } else {
                // prepaire reader
                ImageReadParam param = reader.getDefaultReadParam();

                // so image is bigger than a tile
                // a) check if reader supports source scaling
                if (param.canSetSourceRenderSize()) {
                    // fine => do it so
                    param.setSourceRenderSize(size);
                    bi = reader.read(0, param);
                } else {
                    // so, scaling has to be done by hand
                    bi = loadImageWithTiles(reader, size, quality);
                }
            }
        } else {
            bi = loadImageWithSubSampling(reader, size, quality);
        }
    } finally {
        reader.dispose();
    }
    return bi;
}

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