/*
* @(#)CropImageFilter.java 1.15 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.awt.image;
import java.awt.image.ImageConsumer;
import java.awt.image.ColorModel;
import java.util.Hashtable;
import java.awt.Rectangle;
/**
* An ImageFilter class for cropping images.
* This class extends the basic ImageFilter Class to extract a given
* rectangular region of an existing Image and provide a source for a
* new image containing just the extracted region. It is meant to
* be used in conjunction with a FilteredImageSource object to produce
* cropped versions of existing images.
*
* @see FilteredImageSource
* @see ImageFilter
*
* @version 1.10 08/19/02
* @author Jim Graham
*/
public class CropImageFilter extends ImageFilter {
int cropX;
int cropY;
int cropW;
int cropH;
/**
* Constructs a CropImageFilter that extracts the absolute rectangular
* region of pixels from its source Image as specified by the x, y,
* w, and h parameters.
* @param x the x location of the top of the rectangle to be extracted
* @param y the y location of the top of the rectangle to be extracted
* @param w the width of the rectangle to be extracted
* @param h the height of the rectangle to be extracted
*/
public CropImageFilter(int x, int y, int w, int h) {
cropX = x;
cropY = y;
cropW = w;
cropH = h;
}
/**
* Passes along the properties from the source object after adding a
* property indicating the cropped region.
*/
public void setProperties(Hashtable props) {
props = (Hashtable) props.clone();
props.put("croprect", new Rectangle(cropX, cropY, cropW, cropH));
super.setProperties(props);
}
/**
* Override the source image's dimensions and pass the dimensions
* of the rectangular cropped region to the ImageConsumer.
* @see ImageConsumer
*/
public void setDimensions(int w, int h) {
consumer.setDimensions(cropW, cropH);
}
/**
* Determine whether the delivered byte pixels intersect the region to
* be extracted and passes through only that subset of pixels that
* appear in the output region.
*/
public void setPixels(int x, int y, int w, int h,
ColorModel model, byte pixels[], int off,
int scansize) {
int x1 = x;
if (x1 < cropX) {
x1 = cropX;
}
// 6232366.
// int x2 = x + w;
int x2 = addWithoutOverflow(x, w);
if (x2 > cropX + cropW) {
x2 = cropX + cropW;
}
int y1 = y;
if (y1 < cropY) {
y1 = cropY;
}
// 6232366.
// int y2 = y + h;
int y2 = addWithoutOverflow(y, h);
if (y2 > cropY + cropH) {
y2 = cropY + cropH;
}
if (x1 >= x2 || y1 >= y2) {
return;
}
consumer.setPixels(x1 - cropX, y1 - cropY, (x2 - x1), (y2 - y1),
model, pixels,
off + (y1 - y) * scansize + (x1 - x), scansize);
}
/**
* Determine if the delivered int pixels intersect the region to
* be extracted and pass through only that subset of pixels that
* appear in the output region.
*/
public void setPixels(int x, int y, int w, int h,
ColorModel model, int pixels[], int off,
int scansize) {
int x1 = x;
if (x1 < cropX) {
x1 = cropX;
}
// 6232366.
// int x2 = x + w;
int x2 = addWithoutOverflow(x, w);
if (x2 > cropX + cropW) {
x2 = cropX + cropW;
}
int y1 = y;
if (y1 < cropY) {
y1 = cropY;
}
// 6232366.
// int y2 = y + h;
int y2 = addWithoutOverflow(y, h);
if (y2 > cropY + cropH) {
y2 = cropY + cropH;
}
if (x1 >= x2 || y1 >= y2) {
return;
}
consumer.setPixels(x1 - cropX, y1 - cropY, (x2 - x1), (y2 - y1),
model, pixels,
off + (y1 - y) * scansize + (x1 - x), scansize);
}
// 6232366.
// TCK: ImageConsumer.setPixels(int,int,int,int,ColorModel,int[],int,int)
// is not called for some cases.
//check for potential overflow (see bug 4801285)
private int addWithoutOverflow(int x, int w) {
int x2 = x + w;
if ( x > 0 && w > 0 && x2 < 0 ) {
x2 = Integer.MAX_VALUE;
} else if( x < 0 && w < 0 && x2 > 0 ) {
x2 = Integer.MIN_VALUE;
}
return x2;
}
}