/**
* Accepts a new MaskedGray8Image and initializes all the generator indices.
*
* @param image The input MaskedGray8Image.
* @throws jjil.core.Error if the input is not of type MaskedGray8Image or is smaller than the
* subimages to be generated.
*/
public void push(Image image) throws jjil.core.Error {
if (!(image instanceof Gray8MaskedImage)) {
throw new Error(
Error.PACKAGE.ALGORITHM,
ErrorCodes.OBJECT_NOT_EXPECTED_TYPE,
image.toString(),
"Gray8MaskedImage",
null);
}
if (image.getWidth() < this.nWidth || image.getHeight() < this.nHeight) {
throw new Error(
Error.PACKAGE.ALGORITHM,
ErrorCodes.IMAGE_TOO_SMALL,
image.toString(),
new Integer(this.nWidth).toString(),
new Integer(this.nHeight).toString());
}
this.imageInput = (Gray8MaskedImage) image;
// we want to find the largest integer l such that
// (l-1) * w + w <= iw
// where l = computed limit on index
// w = subimage width or height
// iw = image width or height
// or l = (iw - w) / w + 1 (truncated)
// Java division truncates
this.nHorizLimit = (image.getWidth() - this.nWidth) / this.nXOffset;
this.nVertLimit = (image.getHeight() - this.nHeight) / this.nYOffset;
this.nHorizIndex = -1; // first time through increments
this.nVertIndex = 0;
this.oSubImageReady = false;
}
/**
* Assigns a constant rectangle to the input Gray8Image, replacing values in the image.
*
* @param image the input image (output replaces input).
* @throws Error if the input is not a Gray8Image.
*/
public void push(Image image) throws Error {
if (!(image instanceof Gray8Image)) {
throw new Error(
Error.PACKAGE.ALGORITHM, ErrorCodes.IMAGE_NOT_GRAY8IMAGE, image.toString(), null, null);
}
Gray8Image input = (Gray8Image) image;
byte[] data = input.getData();
int nLimitY = Math.min(input.getHeight(), this.cY + this.nHeight);
int nLimitX = Math.min(input.getWidth(), this.cX + this.nWidth);
for (int i = this.cY; i < nLimitY; i++) {
int nStart = i * image.getWidth();
for (int j = this.cX; j < nLimitX; j++) {
data[nStart + j] = this.bValue;
}
}
super.setOutput(input);
}