211 lines
6.9 KiB
Java
211 lines
6.9 KiB
Java
/* TexturePaintContext.java -- PaintContext impl for TexturePaint
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.awt.java2d;
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import java.awt.AWTError;
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import java.awt.PaintContext;
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import java.awt.Rectangle;
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import java.awt.TexturePaint;
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import java.awt.geom.AffineTransform;
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import java.awt.geom.NoninvertibleTransformException;
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import java.awt.geom.Rectangle2D;
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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.Raster;
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import java.awt.image.WritableRaster;
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/**
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* A {@link PaintContext} implementation for {@link TexturePaint}, done in
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* pure Java.
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*
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public class TexturePaintContext
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implements PaintContext
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{
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/**
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* The TexturePaint object.
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*/
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private BufferedImage image;
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/**
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* The Raster that holds the texture.
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*/
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private WritableRaster paintRaster;
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/**
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* The transform from userspace into device space.
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*/
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private AffineTransform transform;
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/**
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* Creates a new TexturePaintContext for the specified TexturePaint object.
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* This initializes the Raster which is returned by
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* {@link #getRaster(int, int, int, int)}.
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*
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* @param t the texture paint object
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* @param db the bounds of the target raster in device space
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* @param ub the bounds of the target raster in user space
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* @param xform the transformation from user space to device space
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*/
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public TexturePaintContext(TexturePaint t, Rectangle db,
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Rectangle2D ub, AffineTransform xform)
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{
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image = t.getImage();
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try
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{
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// Prepare transform for mapping from device space into image space.
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// In order to achieve this we take the transform for userspace->
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// devicespace, append the correct scale and translation according
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// to the anchor (which gives us the image->userspace->devicespace
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// transform), and invert that (which gives use the device->user->image
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// transform).
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Rectangle2D anchor = t.getAnchorRect();
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BufferedImage image = t.getImage();
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double scaleX = anchor.getWidth() / image.getWidth();
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double scaleY = anchor.getHeight() / image.getHeight();
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transform = (AffineTransform) xform.clone();
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transform.scale(scaleX, scaleY);
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transform.translate(-anchor.getMinX(), -anchor.getMinY());
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transform = transform.createInverse();
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}
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catch (NoninvertibleTransformException ex)
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{
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AWTError err =
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new AWTError("Unexpected NoninvertibleTransformException");
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err.initCause(ex);
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throw err;
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}
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}
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/**
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* Disposes the PaintContext. Nothing is to do here, since we don't use
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* any native resources in that implementation.
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*/
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public void dispose()
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{
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// Nothing to do here.
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}
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/**
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* Returns the color model of this PaintContext. This implementation returnes
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* the color model used by the BufferedImage in the TexturePaint object,
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* this avoids costly color model transformations (at least at this point).
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*
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* @return the color model of this PaintContext
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*/
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public ColorModel getColorModel()
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{
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return image.getColorModel();
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}
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/**
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* Returns the Raster that is used for painting.
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*
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* @param x1 the x location of the raster inside the user bounds of this paint
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* context
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* @param y1 the y location of the raster inside the user bounds of this paint
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* context
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* @param w the width
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* @param h the height
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*
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* @return the Raster that is used for painting
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*
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*/
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public Raster getRaster(int x1, int y1, int w, int h)
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{
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ensureRasterSize(w, h);
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int x2 = x1 + w;
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int y2 = y1 + h;
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float[] src = new float[2];
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float[] dest = new float[2];
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Raster source = image.getData();
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int minX = source.getMinX();
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int width = source.getWidth();
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int minY = source.getMinY();
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int height = source.getHeight();
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Object pixel = null;
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for (int y = y1; y < y2; y++)
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{
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for (int x = x1; x < x2; x++)
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{
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// Transform the coordinates from device space into image space.
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src[0] = x;
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src[1] = y;
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transform.transform(src, 0, dest, 0, 1);
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int dx = (int) dest[0];
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int dy = (int) dest[1];
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// The modulo operation gives us the replication effect.
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dx = ((dx - minX) % width) + minX;
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dy = ((dy - minY) % height) + minY;
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// Handle possible negative values (replicating above the top-left)
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if (dx < 0)
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dx += width;
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if (dy < 0)
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dy += height;
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// Copy the pixel.
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pixel = source.getDataElements(dx, dy, pixel);
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paintRaster.setDataElements(x - x1, y - y1, pixel);
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}
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}
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return paintRaster;
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}
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/**
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* Ensures that the target raster exists and has at least the specified
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* size.
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*
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* @param w the requested target width
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* @param h the requested target height
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*/
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private void ensureRasterSize(int w, int h)
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{
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if (paintRaster == null || paintRaster.getWidth() < w
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|| paintRaster.getHeight() < h)
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{
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Raster s = image.getData();
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paintRaster = s.createCompatibleWritableRaster(w, h);
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}
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}
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}
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