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-rw-r--r--libjava/classpath/java/awt/image/ConvolveOp.java178
1 files changed, 83 insertions, 95 deletions
diff --git a/libjava/classpath/java/awt/image/ConvolveOp.java b/libjava/classpath/java/awt/image/ConvolveOp.java
index 1f73f75b233..ffb834874fa 100644
--- a/libjava/classpath/java/awt/image/ConvolveOp.java
+++ b/libjava/classpath/java/awt/image/ConvolveOp.java
@@ -1,5 +1,5 @@
/* ConvolveOp.java --
- Copyright (C) 2004, 2005 Free Software Foundation -- ConvolveOp
+ Copyright (C) 2004, 2005, 2006, Free Software Foundation -- ConvolveOp
This file is part of GNU Classpath.
@@ -42,7 +42,6 @@ import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
-import java.util.Arrays;
/**
* Convolution filter.
@@ -190,112 +189,101 @@ public class ConvolveOp implements BufferedImageOp, RasterOp
* @see java.awt.image.RasterOp#filter(java.awt.image.Raster,
* java.awt.image.WritableRaster)
*/
- public final WritableRaster filter(Raster src, WritableRaster dest) {
+ public final WritableRaster filter(Raster src, WritableRaster dest)
+ {
if (src == dest)
- throw new IllegalArgumentException();
- if (src.getWidth() < kernel.getWidth() ||
- src.getHeight() < kernel.getHeight())
- throw new ImagingOpException(null);
-
+ throw new IllegalArgumentException("src == dest is not allowed.");
+ if (kernel.getWidth() > src.getWidth()
+ || kernel.getHeight() > src.getHeight())
+ throw new ImagingOpException("The kernel is too large.");
if (dest == null)
dest = createCompatibleDestRaster(src);
- else if (src.numBands != dest.numBands)
- throw new ImagingOpException(null);
+ else if (src.getNumBands() != dest.getNumBands())
+ throw new ImagingOpException("src and dest have different band counts.");
- // Deal with bottom edge
- if (edge == EDGE_ZERO_FILL)
- {
- float[] zeros = new float[src.getNumBands() * src.getWidth()
- * (kernel.getYOrigin() - 1)];
- Arrays.fill(zeros, 0);
- dest.setPixels(src.getMinX(), src.getMinY(), src.getWidth(),
- kernel.getYOrigin() - 1, zeros);
- }
- else
- {
- float[] vals = new float[src.getNumBands() * src.getWidth()
- * (kernel.getYOrigin() - 1)];
- src.getPixels(src.getMinX(), src.getMinY(), src.getWidth(),
- kernel.getYOrigin() - 1, vals);
- dest.setPixels(src.getMinX(), src.getMinY(), src.getWidth(),
- kernel.getYOrigin() - 1, vals);
- }
+ // calculate the borders that the op can't reach...
+ int kWidth = kernel.getWidth();
+ int kHeight = kernel.getHeight();
+ int left = kernel.getXOrigin();
+ int right = Math.max(kWidth - left - 1, 0);
+ int top = kernel.getYOrigin();
+ int bottom = Math.max(kHeight - top - 1, 0);
- // Handle main section
+ // process the region that is reachable...
+ int regionW = src.width - left - right;
+ int regionH = src.height - top - bottom;
float[] kvals = kernel.getKernelData(null);
+ float[] tmp = new float[kWidth * kHeight];
- float[] tmp = new float[kernel.getWidth() * kernel.getHeight()];
- for (int y = src.getMinY() + kernel.getYOrigin();
- y < src.getMinY() + src.getHeight() - kernel.getYOrigin() / 2; y++)
- {
- // Handle unfiltered edge pixels at start of line
- float[] t1 = new float[(kernel.getXOrigin() - 1) * src.getNumBands()];
- if (edge == EDGE_ZERO_FILL)
- Arrays.fill(t1, 0);
- else
- src.getPixels(src.getMinX(), y, kernel.getXOrigin() - 1, 1, t1);
- dest.setPixels(src.getMinX(), y, kernel.getXOrigin() - 1, 1, t1);
-
- for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++)
+ for (int x = 0; x < regionW; x++)
{
- // FIXME: This needs a much more efficient implementation
- for (int b = 0; b < src.getNumBands(); b++)
- {
- float v = 0;
- src.getSamples(x, y, kernel.getWidth(), kernel.getHeight(), b, tmp);
- for (int i=0; i < tmp.length; i++)
- v += tmp[i] * kvals[i];
- dest.setSample(x, y, b, v);
- }
+ for (int y = 0; y < regionH; y++)
+ {
+ // FIXME: This needs a much more efficient implementation
+ for (int b = 0; b < src.getNumBands(); b++)
+ {
+ float v = 0;
+ src.getSamples(x, y, kWidth, kHeight, b, tmp);
+ for (int i = 0; i < tmp.length; i++)
+ v += tmp[tmp.length - i - 1] * kvals[i];
+ // FIXME: in the above line, I've had to reverse the order of
+ // the samples array to make the tests pass. I haven't worked
+ // out why this is necessary.
+ dest.setSample(x + kernel.getXOrigin(), y + kernel.getYOrigin(),
+ b, v);
+ }
+ }
}
-
- // Handle unfiltered edge pixels at end of line
- float[] t2 = new float[(kernel.getWidth() / 2) * src.getNumBands()];
- if (edge == EDGE_ZERO_FILL)
- Arrays.fill(t2, 0);
- else
- src.getPixels(src.getMinX() + src.getWidth()
- - (kernel.getWidth() / 2),
- y, kernel.getWidth() / 2, 1, t2);
- dest.setPixels(src.getMinX() + src.getWidth() - (kernel.getWidth() / 2),
- y, kernel.getWidth() / 2, 1, t2);
- }
- for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
- for (int x = src.getMinX(); x< src.getWidth() + src.getMinX(); x++)
+
+ // fill in the top border
+ fillEdge(src, dest, 0, 0, src.width, top, edge);
+
+ // fill in the bottom border
+ fillEdge(src, dest, 0, src.height - bottom, src.width, bottom, edge);
+
+ // fill in the left border
+ fillEdge(src, dest, 0, top, left, regionH, edge);
+
+ // fill in the right border
+ fillEdge(src, dest, src.width - right, top, right, regionH, edge);
+
+ return dest;
+ }
+
+ /**
+ * Fills a range of pixels (typically at the edge of a raster) with either
+ * zero values (if <code>edgeOp</code> is <code>EDGE_ZERO_FILL</code>) or the
+ * corresponding pixel values from the source raster (if <code>edgeOp</code>
+ * is <code>EDGE_NO_OP</code>). This utility method is called by the
+ * {@link #fillEdge(Raster, WritableRaster, int, int, int, int, int)} method.
+ *
+ * @param src the source raster.
+ * @param dest the destination raster.
+ * @param x the x-coordinate of the top left pixel in the range.
+ * @param y the y-coordinate of the top left pixel in the range.
+ * @param w the width of the pixel range.
+ * @param h the height of the pixel range.
+ * @param edgeOp indicates how to determine the values for the range
+ * (either {@link #EDGE_ZERO_FILL} or {@link #EDGE_NO_OP}).
+ */
+ private void fillEdge(Raster src, WritableRaster dest, int x, int y, int w,
+ int h, int edgeOp)
+ {
+ if (w <= 0)
+ return;
+ if (h <= 0)
+ return;
+ if (edgeOp == EDGE_ZERO_FILL) // fill region with zeroes
{
-
+ float[] zeros = new float[src.getNumBands() * w * h];
+ dest.setPixels(x, y, w, h, zeros);
}
- for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
- for (int x = src.getMinX(); x< src.getWidth() + src.getMinX(); x++)
+ else // copy pixels from source
{
-
+ float[] pixels = new float[src.getNumBands() * w * h];
+ src.getPixels(x, y, w, h, pixels);
+ dest.setPixels(x, y, w, h, pixels);
}
-
- // Handle top edge
- if (edge == EDGE_ZERO_FILL)
- {
- float[] zeros = new float[src.getNumBands() * src.getWidth() *
- (kernel.getHeight() / 2)];
- Arrays.fill(zeros, 0);
- dest.setPixels(src.getMinX(),
- src.getHeight() + src.getMinY() - (kernel.getHeight() / 2),
- src.getWidth(), kernel.getHeight() / 2, zeros);
- }
- else
- {
- float[] vals = new float[src.getNumBands() * src.getWidth() *
- (kernel.getHeight() / 2)];
- src.getPixels(src.getMinX(),
- src.getHeight() + src.getMinY()
- - (kernel.getHeight() / 2),
- src.getWidth(), kernel.getHeight() / 2, vals);
- dest.setPixels(src.getMinX(),
- src.getHeight() + src.getMinY()
- - (kernel.getHeight() / 2),
- src.getWidth(), kernel.getHeight() / 2, vals);
- }
-
- return dest;
}
/* (non-Javadoc)
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