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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/java2d/ImagePaint.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/java2d/ImagePaint.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/java2d/ImagePaint.java | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/java2d/ImagePaint.java b/libjava/classpath/gnu/java/awt/java2d/ImagePaint.java new file mode 100644 index 000000000..7e5fb5638 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/java2d/ImagePaint.java @@ -0,0 +1,192 @@ +/* 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; + } + +} |