com.github.ojil.algorithm.Gray8Crop Maven / Gradle / Ivy
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/*
* Gray8Crop.java
*
* Created on August 27, 2006, 2:38 PM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*
* Copyright 2007 by Jon A. Webb
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* along with this program. If not, see
*
* @author webb
*/
public class Gray8Crop extends PipelineStage {
int cHeight; /* height of cropping window */
int cWidth; /* width of cropping window */
int cX; /* left edge of cropping window */
int cY; /* top of cropping window */
/**
* Creates a new instance of Gray8Crop. The cropping window is specified
* here.
*
* @param x
* left edge of cropping window
* @param y
* top edge of cropping window
* @param width
* width of cropping window
* @param height
* height of cropping window
* @throws ImageError
* if the top left corner of the window is negative, or the
* window area is non-positive.
*/
public Gray8Crop(final int x, final int y, final int width, final int height) throws ImageError {
setWindow(x, y, width, height);
}
/**
* Creates a new instance of Gray8Crop. The cropping window is specified
* here.
*
* @param r
* Rect to crop to.
* @throws ImageError
* if the top left corner of the window is negative, or the
* window area is non-positive.
*/
public Gray8Crop(final Rect r) throws ImageError {
setWindow(r.getLeft(), r.getTop(), r.getWidth(), r.getHeight());
}
/**
* Crops the input gray image to the cropping window that was specified in
* the constructor.
*
* @param image
* the input image.
* @throws ImageError
* if the cropping window extends outside the input image, or
* the input image is not a Gray8Image.
*/
@Override
public void push(final Image image) throws ImageError {
if (!(image instanceof Gray8Image)) {
throw new ImageError(ImageError.PACKAGE.ALGORITHM, AlgorithmErrorCodes.IMAGE_NOT_GRAY8IMAGE, image.toString(), null, null);
}
final Gray8Image imageInput = (Gray8Image) image;
if (((cX + cWidth) > image.getWidth()) || ((cY + cHeight) > image.getHeight())) {
throw new ImageError(ImageError.PACKAGE.CORE, ErrorCodes.BOUNDS_OUTSIDE_IMAGE, image.toString(), toString(), null);
}
final Gray8Image imageResult = new Gray8Image<>(cWidth, cHeight);
final Byte[] src = imageInput.getData();
final Byte[] dst = imageResult.getData();
for (int i = 0; i < cHeight; i++) {
System.arraycopy(src, ((i + cY) * image.getWidth()) + cX, dst, i * cWidth, cWidth);
}
super.setOutput(imageResult);
}
/**
* Gets the cropping window height
*
* @return the cropping window height
*/
public int getHeight() {
return cHeight;
}
/**
* Gets the cropping window left edge
*
* @return the cropping window left edge
*/
public int getLeft() {
return cX;
}
/**
* Gets the cropping window top
*
* @return the cropping window top
*/
public int getTop() {
return cY;
}
/**
* Gets the cropping window width
*
* @return the cropping window width
*/
public int getWidth() {
return cWidth;
}
/**
* Change the cropping window.
*
* @param x
* left edge of cropping window
* @param y
* top edge of cropping window
* @param width
* width of cropping window
* @param height
* height of cropping window
* @throws ImageError
* if the top left corner of the window is negative, or the
* window area is non-positive.
*/
public void setWindow(final int x, final int y, final int width, final int height) throws ImageError {
if ((x < 0) || (y < 0)) {
throw new ImageError(ImageError.PACKAGE.CORE, ErrorCodes.BOUNDS_OUTSIDE_IMAGE, new Integer(x).toString(), new Integer(y).toString(), null);
}
if ((width <= 0) || (height <= 0)) {
throw new ImageError(ImageError.PACKAGE.ALGORITHM, AlgorithmErrorCodes.INPUT_IMAGE_SIZE_NEGATIVE, new Integer(width).toString(), new Integer(height).toString(), null);
}
cX = x;
cY = y;
cWidth = width;
cHeight = height;
}
/**
* Change the cropping window.
*
* @param r
* new Rect to crop to
* @throws ImageError
* if the top left corner of the window is negative, or the
* window area is non-positive.
*/
public void setWindow(final Rect r) throws ImageError {
this.setWindow(r.getLeft(), r.getTop(), r.getWidth(), r.getHeight());
}
/**
* Return a string describing the cropping operation.
*
* @return the string describing the cropping operation.
*/
@Override
public String toString() {
return super.toString() + " (" + cX + "," + cY + //$NON-NLS-1$ //$NON-NLS-2$
"," + cWidth + "," + cHeight + ")"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
}