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package org.pngquant;
import org.pngquant.*;
import java.awt.image.*;
/**
* PngQuant's representation of an Image constructed from BufferedImage.
*/
public class Image extends LiqObject {
/**
* Converts BufferedImage to internal representation (pixel data is copied).
* It's best to use BufferedImage in RGB/RGBA format backed by DataBufferByte.
* Throws if conversion fails.
*/
public Image(BufferedImage image) throws PngQuantException {
this(new PngQuant(), image);
}
public Image(PngQuant attr, BufferedImage image) throws PngQuantException {
handle = handleFromImage(attr, image);
if (handle == 0) {
BufferedImage converted = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
converted.getGraphics().drawImage(image, 0, 0, null);
handle = handleFromImage(attr, converted);
if (handle == 0) {
throw new PngQuantException();
}
}
}
/**
* Guarantees presence of the given color in the palette (subject to setMaxColors())
* if this image is used for quantization.
*/
public native boolean addFixedColor(int r, int g, int b, int a);
public boolean addFixedColor(int r, int g, int b) {
return addFixedColor(r, g, b, 255);
}
public native int getWidth();
public native int getHeight();
public void close() {
if (handle != 0) {
liq_image_destroy(handle);
handle = 0;
}
}
private static long handleFromImage(PngQuant attr, BufferedImage image) {
// The JNI wrapper will accept non-premultiplied ABGR and BGR only.
int type = image.getType();
if (type != BufferedImage.TYPE_3BYTE_BGR &&
type != BufferedImage.TYPE_4BYTE_ABGR &&
type != BufferedImage.TYPE_4BYTE_ABGR_PRE) return 0;
WritableRaster raster = image.getRaster();
ColorModel color = image.getColorModel();
if (type == BufferedImage.TYPE_4BYTE_ABGR_PRE) color.coerceData(raster, false);
DataBuffer buffer = raster.getDataBuffer();
if (buffer instanceof DataBufferByte) {
byte[] imageData = ((DataBufferByte)buffer).getData();
return liq_image_create(attr.handle, imageData,
raster.getWidth(), raster.getHeight(), color.getNumComponents());
}
return 0;
}
private static native long liq_image_create(long attr, byte[] bitmap, int width, int height, int components);
private static native void liq_image_destroy(long handle);
}
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