yggdrasil/gcc
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merged gcj-eclipse branch to trunk.

Browse Source 
From-SVN: r120621
This commit is contained in:
Tom Tromey
2007-01-09 19:58:05 +00:00
parent c648dedbde
commit 97b8365caf
17478 changed files with 606493 additions and 100744 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libjava/classpath/java/awt/image/RescaleOp.java
+231 -64
View File
@@ -1,4 +1,4 @@
/* Copyright (C) 2004 Free Software Foundation
/* Copyright (C) 2004, 2006 Free Software Foundation
This file is part of GNU Classpath.
@@ -43,7 +43,23 @@ import java.awt.geom.Rectangle2D;
import java.util.Arrays;
/**
* RescaleOp is a filter that changes each pixel by a scaling factor and offset.
*
* For filtering Rasters, either one scaling factor and offset can be specified,
* which will be applied to all bands; or a scaling factor and offset can be
* specified for each band.
*
* For BufferedImages, the scaling may apply to both color and alpha components.
* If only one scaling factor is provided, or if the number of factors provided
* equals the number of color components, the scaling is performed on all color
* components. Otherwise, the scaling is performed on all components including
* alpha. Alpha premultiplication is ignored.
*
* After filtering, if color conversion is necessary, the conversion happens,
* taking alpha premultiplication into account.
*
* @author Jerry Quinn (jlquinn@optonline.net)
* @author Francis Kung (fkung@redhat.com)
*/
public class RescaleOp implements BufferedImageOp, RasterOp
{
@@ -51,15 +67,43 @@ public class RescaleOp implements BufferedImageOp, RasterOp
private float[] offsets;
private RenderingHints hints = null;
/**
* Create a new RescaleOp object using the given scale factors and offsets.
*
* The length of the arrays must be equal to the number of bands (or number of
* data or color components) of the raster/image that this Op will be used on,
* otherwise an IllegalArgumentException will be thrown when calling the
* filter method.
*
* @param scaleFactors an array of scale factors.
* @param offsets an array of offsets.
* @param hints any rendering hints to use (can be null).
* @throws NullPointerException if the scaleFactors or offsets array is null.
*/
public RescaleOp(float[] scaleFactors,
float[] offsets,
RenderingHints hints)
{
this.scale = scaleFactors;
this.offsets = offsets;
int length = Math.min(scaleFactors.length, offsets.length);
scale = new float[length];
System.arraycopy(scaleFactors, 0, this.scale, 0, length);
this.offsets = new float[length];
System.arraycopy(offsets, 0, this.offsets, 0, length);
this.hints = hints;
}
/**
* Create a new RescaleOp object using the given scale factor and offset.
*
* The same scale factor and offset will be used on all bands/components.
*
* @param scaleFactor the scale factor to use.
* @param offset the offset to use.
* @param hints any rendering hints to use (can be null).
*/
public RescaleOp(float scaleFactor,
float offset,
RenderingHints hints)
@@ -69,22 +113,47 @@ public class RescaleOp implements BufferedImageOp, RasterOp
this.hints = hints;
}
/**
* Returns the scaling factors. This method accepts an optional array, which
* will be used to store the factors if not null (this avoids allocating a
* new array). If this array is too small to hold all the scaling factors,
* the array will be filled and the remaining factors discarded.
*
* @param scaleFactors array to store the scaling factors in (can be null).
* @return an array of scaling factors.
*/
public final float[] getScaleFactors(float[] scaleFactors)
{
if (scaleFactors == null)
scaleFactors = new float[scale.length];
System.arraycopy(scale, 0, scaleFactors, 0, scale.length);
System.arraycopy(scale, 0, scaleFactors, 0, Math.min(scale.length,
scaleFactors.length));
return scaleFactors;
}
/**
* Returns the offsets. This method accepts an optional array, which
* will be used to store the offsets if not null (this avoids allocating a
* new array). If this array is too small to hold all the offsets, the array
* will be filled and the remaining factors discarded.
*
* @param offsets array to store the offsets in (can be null).
* @return an array of offsets.
*/
public final float[] getOffsets(float[] offsets)
{
if (offsets == null)
offsets = new float[this.offsets.length];
System.arraycopy(this.offsets, 0, offsets, 0, this.offsets.length);
System.arraycopy(this.offsets, 0, offsets, 0, Math.min(this.offsets.length,
offsets.length));
return offsets;
}
/**
* Returns the number of scaling factors / offsets.
*
* @return the number of scaling factors / offsets.
*/
public final int getNumFactors()
{
return scale.length;
@@ -98,36 +167,74 @@ public class RescaleOp implements BufferedImageOp, RasterOp
return hints;
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)
/**
* Converts the source image using the scale factors and offsets specified in
* the constructor. The resulting image is stored in the destination image if
* one is provided; otherwise a new BufferedImage is created and returned.
*
* The source image cannot use an IndexColorModel, and the destination image
* (if one is provided) must have the same size.
*
* If the final value of a sample is beyond the range of the color model, it
* will be clipped to the appropriate maximum / minimum.
*
* @param src The source image.
* @param dst The destination image.
* @throws IllegalArgumentException if the rasters and/or color spaces are
* incompatible.
* @return The rescaled image.
*/
public final BufferedImage filter(BufferedImage src, BufferedImage dst)
{
// TODO Make sure premultiplied alpha is handled correctly.
// TODO See that color conversion is handled.
// TODO figure out how to use rendering hints.
if (scale.length != offsets.length)
throw new IllegalArgumentException();
// Initial checks
if (scale.length != 1
&& scale.length != src.getColorModel().getNumComponents()
&& (scale.length != src.getColorModel().getNumColorComponents()))
throw new IllegalArgumentException("Source image has wrong number of "
+ "bands for these scaling factors.");
ColorModel scm = src.getColorModel();
if (dst == null) dst = createCompatibleDestImage(src, null);
if (dst == null)
dst = createCompatibleDestImage(src, null);
else if (src.getHeight() != dst.getHeight()
|| src.getWidth() != dst.getWidth())
throw new IllegalArgumentException("Source and destination images are "
+ "different sizes.");
WritableRaster wsrc = src.getRaster();
WritableRaster wdst = dst.getRaster();
// Share constant across colors except alpha
if (scale.length == 1 || scale.length == scm.getNumColorComponents())
// Prepare for possible colorspace conversion
BufferedImage dst2 = dst;
if (dst.getColorModel().getColorSpace().getType() != src.getColorModel().getColorSpace().getType())
dst2 = createCompatibleDestImage(src, src.getColorModel());
// Figure out how many bands to scale
int numBands = scale.length;
if (scale.length == 1)
numBands = src.getColorModel().getNumColorComponents();
boolean[] bands = new boolean[numBands];
// this assumes the alpha, if present, is the last band
Arrays.fill(bands, true);
// Perform rescaling
filter(src.getRaster(), dst2.getRaster(), bands);
// Copy alpha band if needed (ie if it exists and wasn't scaled)
// NOTE: This assumes the alpha component is the last band!
if (src.getColorModel().hasAlpha()
&& numBands == src.getColorModel().getNumColorComponents())
{
// Construct a raster that doesn't include an alpha band.
int[] subbands = new int[scm.getNumColorComponents()];
for (int i=0; i < subbands.length; i++) subbands[i] = i;
wsrc =
wsrc.createWritableChild(wsrc.minX, wsrc.minY, wsrc.width, wsrc.height,
wsrc.minX, wsrc.minY, subbands);
}
// else all color bands
filter(wsrc, wdst);
dst2.getRaster().setSamples(0, 0, src.getWidth(), src.getHeight(),
numBands,
src.getRaster().getSamples(0, 0,
src.getWidth(),
src.getHeight(),
numBands,
(int[]) null));
}
// Perform colorspace conversion if needed
if (dst != dst2)
new ColorConvertOp(hints).filter(dst2, dst);
return dst;
}
@@ -136,50 +243,106 @@ public class RescaleOp implements BufferedImageOp, RasterOp
*/
public final WritableRaster filter(Raster src, WritableRaster dest)
{
if (dest == null) dest = src.createCompatibleWritableRaster();
// Required sanity checks
if (src.numBands != dest.numBands || scale.length != offsets.length)
throw new IllegalArgumentException();
if (scale.length != 1 && scale.length != src.numBands)
throw new IllegalArgumentException();
throw new IllegalArgumentException("Number of rasters is incompatible "
+ "with the number of scaling "
+ "factors provided.");
// Create scaling arrays if needed
float[] lscale = scale;
float[] loff = offsets;
if (scale.length == 1)
{
lscale = new float[src.numBands];
Arrays.fill(lscale, scale[0]);
loff = new float[src.numBands];
Arrays.fill(loff, offsets[0]);
}
if (dest == null)
dest = src.createCompatibleWritableRaster();
else if (src.getHeight() != dest.getHeight()
|| src.getWidth() != dest.getWidth())
throw new IllegalArgumentException("Source and destination rasters are "
+ "different sizes.");
else if (src.numBands != dest.numBands)
throw new IllegalArgumentException("Source and destination rasters "
+ "are incompatible.");
// TODO The efficiency here can be improved for various data storage
// patterns, aka SampleModels.
float[] pixel = new float[src.numBands];
for (int y = src.minY; y < src.height + src.minY; y++)
for (int x = src.minX; x < src.width + src.minX; x++)
{
src.getPixel(x, y, pixel);
for (int b = 0; b < src.numBands; b++)
pixel[b] = pixel[b] * lscale[b] + loff[b];
dest.setPixel(x, y, pixel);
}
// Filter all bands
boolean[] bands = new boolean[src.getNumBands()];
Arrays.fill(bands, true);
return filter(src, dest, bands);
}
/**
* Perform raster-based filtering on a selected number of bands.
*
* The length of the bands array should equal the number of bands; a true
* element indicates filtering should happen on the corresponding band, while
* a false element will skip the band.
*
* The rasters are assumed to be compatible and non-null.
*
* @param src the source raster.
* @param dest the destination raster.
* @param bands an array indicating which bands to filter.
* @throws NullPointerException if any parameter is null.
* @throws ArrayIndexOutOfBoundsException if the bands array is too small.
* @return the destination raster.
*/
private WritableRaster filter(Raster src, WritableRaster dest, boolean[] bands)
{
int[] values = new int[src.getHeight() * src.getWidth()];
float scaleFactor, offset;
// Find max sample value, to be used for clipping later
int[] maxValue = src.getSampleModel().getSampleSize();
for (int i = 0; i < maxValue.length; i++)
maxValue[i] = (int)Math.pow(2, maxValue[i]) - 1;
// TODO: can this be optimized further?
// Filter all samples of all requested bands
for (int band = 0; band < bands.length; band++)
if (bands[band])
{
values = src.getSamples(src.getMinX(), src.getMinY(), src.getWidth(),
src.getHeight(), band, values);
if (scale.length == 1)
{
scaleFactor = scale[0];
offset = offsets[0];
}
else
{
scaleFactor = scale[band];
offset = offsets[band];
}
for (int i = 0; i < values.length; i++)
{
values[i] = (int) (values[i] * scaleFactor + offset);
// Clip if needed
if (values[i] < 0)
values[i] = 0;
if (values[i] > maxValue[band])
values[i] = maxValue[band];
}
dest.setSamples(dest.getMinX(), dest.getMinY(), dest.getWidth(),
dest.getHeight(), band, values);
}
return dest;
}
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel)
/*
* (non-Javadoc)
*
* @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage,
* java.awt.image.ColorModel)
*/
public BufferedImage createCompatibleDestImage(BufferedImage src,
ColorModel dstCM)
{
if (dstCM == null) dstCM = src.getColorModel();
WritableRaster wr = src.getRaster().createCompatibleWritableRaster();
BufferedImage image
= new BufferedImage(dstCM, wr, src.isPremultiplied, null);
return image;
if (dstCM == null)
return new BufferedImage(src.getWidth(), src.getHeight(), src.getType());
return new BufferedImage(dstCM,
src.getRaster().createCompatibleWritableRaster(),
src.isAlphaPremultiplied(), null);
}
/* (non-Javadoc)
@@ -209,9 +372,13 @@ public class RescaleOp implements BufferedImageOp, RasterOp
/* (non-Javadoc)
* @see java.awt.image.BufferedImageOp#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D)
*/
public final Point2D getPoint2D(Point2D src, Point2D dst) {
if (dst == null) dst = (Point2D) src.clone();
else dst.setLocation(src);
public final Point2D getPoint2D(Point2D src, Point2D dst)
{
if (dst == null)
dst = (Point2D) src.clone();
else
dst.setLocation(src);
return dst;
}