summaryrefslogtreecommitdiff
path: root/libjava/classpath/gnu/java/awt/java2d/TexturePaintContext.java
diff options
context:
space:
mode:
Diffstat (limited to 'libjava/classpath/gnu/java/awt/java2d/TexturePaintContext.java')
-rw-r--r--libjava/classpath/gnu/java/awt/java2d/TexturePaintContext.java211
1 files changed, 211 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/java2d/TexturePaintContext.java b/libjava/classpath/gnu/java/awt/java2d/TexturePaintContext.java
new file mode 100644
index 000000000..2523d2311
--- /dev/null
+++ b/libjava/classpath/gnu/java/awt/java2d/TexturePaintContext.java
@@ -0,0 +1,211 @@
+/* TexturePaintContext.java -- PaintContext impl for TexturePaint
+ 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.AWTError;
+import java.awt.PaintContext;
+import java.awt.Rectangle;
+import java.awt.TexturePaint;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.NoninvertibleTransformException;
+import java.awt.geom.Rectangle2D;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.Raster;
+import java.awt.image.WritableRaster;
+
+/**
+ * A {@link PaintContext} implementation for {@link TexturePaint}, done in
+ * pure Java.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public class TexturePaintContext
+ implements PaintContext
+{
+
+ /**
+ * The TexturePaint object.
+ */
+ private BufferedImage image;
+
+ /**
+ * The Raster that holds the texture.
+ */
+ private WritableRaster paintRaster;
+
+ /**
+ * The transform from userspace into device space.
+ */
+ private AffineTransform transform;
+
+ /**
+ * Creates a new TexturePaintContext for the specified TexturePaint object.
+ * This initializes the Raster which is returned by
+ * {@link #getRaster(int, int, int, int)}.
+ *
+ * @param t the texture paint object
+ * @param db the bounds of the target raster in device space
+ * @param ub the bounds of the target raster in user space
+ * @param xform the transformation from user space to device space
+ */
+ public TexturePaintContext(TexturePaint t, Rectangle db,
+ Rectangle2D ub, AffineTransform xform)
+ {
+ image = t.getImage();
+
+ try
+ {
+ // Prepare transform for mapping from device space into image space.
+ // In order to achieve this we take the transform for userspace->
+ // devicespace, append the correct scale and translation according
+ // to the anchor (which gives us the image->userspace->devicespace
+ // transform), and invert that (which gives use the device->user->image
+ // transform).
+ Rectangle2D anchor = t.getAnchorRect();
+ BufferedImage image = t.getImage();
+ double scaleX = anchor.getWidth() / image.getWidth();
+ double scaleY = anchor.getHeight() / image.getHeight();
+ transform = (AffineTransform) xform.clone();
+ transform.scale(scaleX, scaleY);
+ transform.translate(-anchor.getMinX(), -anchor.getMinY());
+ transform = transform.createInverse();
+ }
+ catch (NoninvertibleTransformException ex)
+ {
+ AWTError err =
+ new AWTError("Unexpected NoninvertibleTransformException");
+ err.initCause(ex);
+ throw err;
+ }
+ }
+
+ /**
+ * Disposes the PaintContext. Nothing is to do here, since we don't use
+ * any native resources in that implementation.
+ */
+ public void dispose()
+ {
+ // Nothing to do here.
+ }
+
+ /**
+ * Returns the color model of this PaintContext. This implementation returnes
+ * the color model used by the BufferedImage in the TexturePaint object,
+ * this avoids costly color model transformations (at least at this point).
+ *
+ * @return the color model of this PaintContext
+ */
+ public ColorModel getColorModel()
+ {
+ return image.getColorModel();
+ }
+
+ /**
+ * Returns the Raster that is used for painting.
+ *
+ * @param x1 the x location of the raster inside the user bounds of this paint
+ * context
+ * @param y1 the y location of the raster inside the user bounds of this paint
+ * context
+ * @param w the width
+ * @param h the height
+ *
+ * @return the Raster that is used for painting
+ *
+ */
+ 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 width = source.getWidth();
+ int minY = source.getMinY();
+ int height = source.getHeight();
+ Object pixel = null;
+ for (int y = y1; y < y2; y++)
+ {
+ for (int x = x1; x < x2; x++)
+ {
+ // Transform the coordinates from device space into image space.
+ src[0] = x;
+ src[1] = y;
+ transform.transform(src, 0, dest, 0, 1);
+ int dx = (int) dest[0];
+ int dy = (int) dest[1];
+
+ // The modulo operation gives us the replication effect.
+ dx = ((dx - minX) % width) + minX;
+ dy = ((dy - minY) % height) + minY;
+
+ // Handle possible negative values (replicating above the top-left)
+ if (dx < 0)
+ dx += width;
+ if (dy < 0)
+ dy += height;
+
+ // Copy the pixel.
+ pixel = source.getDataElements(dx, dy, pixel);
+ paintRaster.setDataElements(x - x1, y - y1, pixel);
+ }
+ }
+ return paintRaster;
+ }
+
+ /**
+ * 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 (paintRaster == null || paintRaster.getWidth() < w
+ || paintRaster.getHeight() < h)
+ {
+ Raster s = image.getData();
+ paintRaster = s.createCompatibleWritableRaster(w, h);
+ }
+ }
+}