126 lines
4.2 KiB
Java
126 lines
4.2 KiB
Java
/*
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* VectorGraphics2D: Vector export for Java(R) Graphics2D
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*
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* (C) Copyright 2010 Erich Seifert <dev[at]erichseifert.de>
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*
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* This file is part of VectorGraphics2D.
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*
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* VectorGraphics2D is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* VectorGraphics2D is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with VectorGraphics2D. If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.erichseifert.vectorgraphics2d;
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import java.awt.Graphics;
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import java.awt.GraphicsConfiguration;
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import java.awt.GraphicsDevice;
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import java.awt.GraphicsEnvironment;
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import java.awt.HeadlessException;
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import java.awt.Image;
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import java.awt.Transparency;
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import java.awt.image.BufferedImage;
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import java.awt.image.ColorModel;
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import java.awt.image.PixelGrabber;
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import javax.swing.ImageIcon;
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/**
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* Abstract class that contains utility functions for working with graphics.
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* For example, this includes font handling.
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*/
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public abstract class GraphicsUtils {
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/**
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* Default constructor that prevents creation of class.
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*/
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protected GraphicsUtils() {
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throw new UnsupportedOperationException();
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}
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/**
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* This method returns <code>true</code> if the specified image
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* has transparent pixels.
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* Taken from http://www.exampledepot.com/egs/java.awt.image/HasAlpha.html
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* @param image
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* @return <code>true</code> if the specified image has transparent pixels,
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* <code>false</code> otherwise
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*/
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public static boolean hasAlpha(Image image) {
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// If buffered image, the color model is readily available
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if (image instanceof BufferedImage) {
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BufferedImage bimage = (BufferedImage) image;
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return bimage.getColorModel().hasAlpha();
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}
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// Use a pixel grabber to retrieve the image's color model;
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// grabbing a single pixel is usually sufficient
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PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
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try {
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pg.grabPixels();
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} catch (InterruptedException e) {
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}
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// Get the image's color model
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ColorModel cm = pg.getColorModel();
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return cm.hasAlpha();
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}
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/**
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* This method returns a buffered image with the contents of an image.
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* Taken from http://www.exampledepot.com/egs/java.awt.image/Image2Buf.html
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* @param image Image ot be converted
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* @return a buffered image with the contents of the specified image
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*/
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public static BufferedImage toBufferedImage(Image image) {
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if (image instanceof BufferedImage) {
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return (BufferedImage) image;
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}
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// This code ensures that all the pixels in the image are loaded
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image = new ImageIcon(image).getImage();
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// Determine if the image has transparent pixels
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boolean hasAlpha = hasAlpha(image);
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// Create a buffered image with a format that's compatible with the
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// screen
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BufferedImage bimage = null;
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GraphicsEnvironment ge = GraphicsEnvironment
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.getLocalGraphicsEnvironment();
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try {
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// Determine the type of transparency of the new buffered image
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int transparency = Transparency.OPAQUE;
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if (hasAlpha) {
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transparency = Transparency.BITMASK;
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}
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// Create the buffered image
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GraphicsDevice gs = ge.getDefaultScreenDevice();
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GraphicsConfiguration gc = gs.getDefaultConfiguration();
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bimage = gc.createCompatibleImage(
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image.getWidth(null), image.getHeight(null), transparency);
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} catch (HeadlessException e) {
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// The system does not have a screen
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bimage = null;
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}
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if (bimage == null) {
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// Create a buffered image using the default color model
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int type = BufferedImage.TYPE_INT_RGB;
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if (hasAlpha) {
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type = BufferedImage.TYPE_INT_ARGB;
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}
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bimage = new BufferedImage(
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image.getWidth(null), image.getHeight(null), type);
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}
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// Copy image to buffered image
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Graphics g = bimage.createGraphics();
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// Paint the image onto the buffered image
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g.drawImage(image, 0, 0, null);
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g.dispose();
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return bimage;
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}
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}
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