// package accessible for SubsampleBinaryToGrayOpImage4x4, etc...
static ImageLayout layoutHelper(
RenderedImage source, float scaleX, float scaleY, ImageLayout il, Map config) {
ImageLayout layout = (il == null) ? new ImageLayout() : (ImageLayout) il.clone();
// to compute dWidth and dHeight
// fTol and dWi, dHi must be the same as in computeDestInfo(..)
// due to static method, a few lines of coding are repeated
int srcWidth = source.getWidth();
int srcHeight = source.getHeight();
float f_dw = scaleX * srcWidth;
float f_dh = scaleY * srcHeight;
float fTol = .1F * Math.min(scaleX / (f_dw + 1.0F), scaleY / (f_dh + 1.0F));
int dWi = (int) (f_dw);
int dHi = (int) (f_dh);
// let it be int in the almost int case
// espacially in the true int case with float calculation errors
if (Math.abs(Math.round(f_dw) - f_dw) < fTol) {
dWi = Math.round(f_dw);
}
if (Math.abs(Math.round(f_dh) - f_dh) < fTol) {
dHi = Math.round(f_dh);
}
// Set the top left coordinate of the destination
layout.setMinX((int) (scaleX * source.getMinX()));
layout.setMinY((int) (scaleY * source.getMinY()));
layout.setWidth(dWi);
layout.setHeight(dHi);
// sample model
SampleModel sm = layout.getSampleModel(null);
if (sm == null
|| sm.getDataType() != DataBuffer.TYPE_BYTE
|| !(sm instanceof PixelInterleavedSampleModel
|| sm instanceof SinglePixelPackedSampleModel && sm.getNumBands() == 1)) {
// Width and height will be corrected in OpImage.layoutHelper
sm = new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, 1, 1, 1, 1, new int[] {0});
}
layout.setSampleModel(sm);
ColorModel cm = layout.getColorModel(null);
if (cm == null || !JDKWorkarounds.areCompatibleDataModels(sm, cm)) {
layout.setColorModel(ImageUtil.getCompatibleColorModel(sm, config));
}
return layout;
}
/**
* Fills in the portions of a given <code>Raster</code> that lie outside the bounds of a given
* <code>PlanarImage</code> with suitably reflected copies of the entire image.
*
* <p>The portion of <code>raster</code> that lies within <code>im.getBounds()</code> is not
* altered.
*
* @param raster The <code>WritableRaster</code> the border area of which is to be filled with
* suitably reflected copies of portions of the specified image.
* @param im The <code>PlanarImage</code> the data of which is to be reflected and used to fill
* the <code>WritableRaster</code> border.
* @throws <code>IllegalArgumentException</code> if either parameter is <code>null</code>.
*/
public final void extend(WritableRaster raster, PlanarImage im) {
if (raster == null || im == null) {
throw new IllegalArgumentException(JaiI18N.getString("Generic0"));
}
int width = raster.getWidth();
int height = raster.getHeight();
int minX = raster.getMinX();
int maxX = minX + width;
int minY = raster.getMinY();
int maxY = minY + height;
int imMinX = im.getMinX();
int imMinY = im.getMinY();
int imWidth = im.getWidth();
int imHeight = im.getHeight();
int validMinX = Math.max(imMinX, minX);
int validMaxX = Math.min(imMinX + imWidth, maxX);
int validMinY = Math.max(imMinY, minY);
int validMaxY = Math.min(imMinY + imHeight, maxY);
if (validMinX > validMaxX || validMinY > validMaxY) {
// Raster does not intersect image. Determine the location
// and size of the smallest rectangle containing the Raster
// and which intersects the image.
if (validMinX > validMaxX) { // no intersetion in X
if (minX == validMinX) {
minX = im.getMaxX() - 1;
} else {
maxX = im.getMinX();
}
}
if (validMinY > validMaxY) { // no intersetion in Y
if (minY == validMinY) {
minY = im.getMaxY() - 1;
} else {
maxY = im.getMinY();
}
}
// Create minimum Raster.
WritableRaster wr =
raster.createCompatibleWritableRaster(minX, minY, maxX - minX, maxY - minY);
// Extend the data.
extend(wr, im);
// Create a child with same bounds as the target Raster.
Raster child =
wr.createChild(
raster.getMinX(),
raster.getMinY(),
raster.getWidth(),
raster.getHeight(),
raster.getMinX(),
raster.getMinY(),
null);
// Copy the data from the child.
JDKWorkarounds.setRect(raster, child, 0, 0);
return;
}
Rectangle rect = new Rectangle();
// Notionally extend the source image by treating it as a single
// tile of an infinite tiled image. Adjacent tiles are reflections
// of one another.
// Compute the min and max X and Y tile indices of the area
// intersected by the output raster.
int minTileX = PlanarImage.XToTileX(minX, imMinX, imWidth);
int maxTileX = PlanarImage.XToTileX(maxX - 1, imMinX, imWidth);
int minTileY = PlanarImage.YToTileY(minY, imMinY, imHeight);
int maxTileY = PlanarImage.YToTileY(maxY - 1, imMinY, imHeight);
// Loop over the tiles
for (int tileY = minTileY; tileY <= maxTileY; tileY++) {
int ty = tileY * imHeight + imMinY;
for (int tileX = minTileX; tileX <= maxTileX; tileX++) {
int tx = tileX * imWidth + imMinX;
// Don't touch the central "tile" (actual image)
if (tileX == 0 && tileY == 0) {
continue;
}
boolean flipX = (Math.abs(tileX) % 2) == 1;
boolean flipY = (Math.abs(tileY) % 2) == 1;
// Clip the tile bounds against the bounds of the Raster.
// Keep track of the (x, y) offset of the start of the tile.
rect.x = tx;
rect.y = ty;
rect.width = imWidth;
rect.height = imHeight;
int xOffset = 0;
if (rect.x < minX) {
xOffset = minX - rect.x;
rect.x = minX;
rect.width -= xOffset;
}
int yOffset = 0;
if (rect.y < minY) {
yOffset = minY - rect.y;
rect.y = minY;
rect.height -= yOffset;
}
if (rect.x + rect.width > maxX) {
rect.width = maxX - rect.x;
}
if (rect.y + rect.height > maxY) {
rect.height = maxY - rect.y;
}
int imX;
if (flipX) {
if (xOffset == 0) {
imX = imMinX + imWidth - rect.width;
} else {
imX = imMinX;
}
} else {
imX = imMinX + xOffset;
}
int imY;
if (flipY) {
if (yOffset == 0) {
imY = imMinY + imHeight - rect.height;
} else {
imY = imMinY;
}
} else {
imY = imMinY + yOffset;
}
// Create a child raster with coordinates within the
// actual image.
WritableRaster child =
RasterFactory.createWritableChild(
raster, rect.x, rect.y, rect.width, rect.height, imX, imY, null);
// Copy the data into the Raster
im.copyData(child);
if (flipX) {
flipX(child);
}
if (flipY) {
flipY(child);
}
}
}
}
