| /* ImagePaint.java -- Supplies the pixels for image rendering |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.awt.java2d; |
| |
| import java.awt.Paint; |
| import java.awt.PaintContext; |
| import java.awt.Rectangle; |
| import java.awt.RenderingHints; |
| import java.awt.Transparency; |
| import java.awt.geom.AffineTransform; |
| import java.awt.geom.Rectangle2D; |
| import java.awt.image.ColorModel; |
| import java.awt.image.Raster; |
| import java.awt.image.RenderedImage; |
| import java.awt.image.WritableRaster; |
| |
| /** |
| * This class is used as a temporary Paint object to supply the pixel values |
| * for image rendering using the normal scanline conversion implementation. |
| * |
| * @author Roman Kennke (kennke@aicas.com) |
| */ |
| public class ImagePaint |
| implements Paint |
| { |
| |
| /** |
| * The PaintContext implementation for the ImagePaint. |
| */ |
| private class ImagePaintContext |
| implements PaintContext |
| { |
| |
| /** |
| * The target raster. |
| */ |
| private WritableRaster target; |
| |
| /** |
| * Nothing to do here. |
| */ |
| public void dispose() |
| { |
| // Nothing to do here. |
| } |
| |
| /** |
| * Returns the color model. |
| * |
| * @return the color model |
| */ |
| public ColorModel getColorModel() |
| { |
| return image.getColorModel(); |
| } |
| |
| /** |
| * Supplies the pixel to be rendered. |
| * |
| * @see PaintContext#getRaster(int, int, int, int) |
| */ |
| public Raster getRaster(int x1, int y1, int w, int h) |
| { |
| ensureRasterSize(w, h); |
| int x2 = x1 + w; |
| int y2 = y1 + h; |
| float[] src = new float[2]; |
| float[] dest = new float[2]; |
| Raster source = image.getData(); |
| int minX = source.getMinX(); |
| int maxX = source.getWidth() + minX; |
| int minY = source.getMinY(); |
| int maxY = source.getHeight() + minY; |
| Object pixel = null; |
| for (int y = y1; y < y2; y++) |
| { |
| for (int x = x1; x < x2; x++) |
| { |
| src[0] = x; |
| src[1] = y; |
| transform.transform(src, 0, dest, 0, 1); |
| int dx = (int) dest[0]; |
| int dy = (int) dest[1]; |
| // Pixels outside the source image are not of interest, skip |
| // them. |
| if (dx >= minX && dx < maxX && dy >= minY && dy < maxY) |
| { |
| pixel = source.getDataElements(dx, dy, pixel); |
| target.setDataElements(x - x1, y - y1, pixel); |
| } |
| } |
| } |
| return target; |
| } |
| |
| /** |
| * Ensures that the target raster exists and has at least the specified |
| * size. |
| * |
| * @param w the requested target width |
| * @param h the requested target height |
| */ |
| private void ensureRasterSize(int w, int h) |
| { |
| if (target == null || target.getWidth() < w || target.getHeight() < h) |
| { |
| Raster s = image.getData(); |
| target = s.createCompatibleWritableRaster(w, h); |
| } |
| } |
| } |
| |
| /** |
| * The image to render. |
| */ |
| RenderedImage image; |
| |
| /** |
| * The transform from image space to device space. This is the inversed |
| * transform of the concatenated |
| * transform image space -> user space -> device space transform. |
| */ |
| AffineTransform transform; |
| |
| /** |
| * Creates a new ImagePaint for rendering the specified image using the |
| * specified device space -> image space transform. This transform |
| * is the inversed transform of the usual image space -> user space -> device |
| * space transform. |
| * |
| * The ImagePaint will only render the image in the specified area of |
| * interest (which is specified in image space). |
| * |
| * @param i the image to render |
| * @param t the device space to user space transform |
| */ |
| ImagePaint(RenderedImage i, AffineTransform t) |
| { |
| image = i; |
| transform = t; |
| } |
| |
| public PaintContext createContext(ColorModel cm, Rectangle deviceBounds, |
| Rectangle2D userBounds, |
| AffineTransform xform, |
| RenderingHints hints) |
| { |
| return new ImagePaintContext(); |
| } |
| |
| public int getTransparency() |
| { |
| return Transparency.OPAQUE; |
| } |
| |
| } |