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