private synchronized void computeHistogram(Rectangle visibleRect, PlanarImage image) {
int channels = image.getSampleModel().getNumBands();
Histogram hist = new Histogram(256, 256, 512, channels);
bins = hist.getBins();
// Raster raster = image.getData(visibleRect);
Rectangle bounds = visibleRect; // image.getBounds();
int pixel[] = null;
int maxPixels = 256;
int incX = bounds.width >= 2 * maxPixels ? bounds.width / maxPixels : 1;
int incY = bounds.height >= 2 * maxPixels ? bounds.height / maxPixels : 1;
double log2 = Math.log(2);
int minTileX = image.XToTileX(bounds.x);
int maxTileX = image.XToTileX(bounds.x + bounds.width - 1);
int minTileY = image.YToTileY(bounds.y);
int maxTileY = image.YToTileY(bounds.y + bounds.height - 1);
for (int tx = minTileX; tx <= maxTileX; tx++)
for (int ty = minTileY; ty <= maxTileY; ty++) {
Raster raster = image.getTile(tx, ty);
int minX = Math.max(bounds.x, raster.getMinX());
int maxX = Math.min(bounds.x + bounds.width, raster.getMinX() + raster.getWidth());
int minY = Math.max(bounds.y, raster.getMinY());
int maxY = Math.min(bounds.y + bounds.height, raster.getMinY() + raster.getHeight());
for (int x = minX; x < maxX; x += incX)
for (int y = minY; y < maxY; y += incY) {
pixel = raster.getPixel(x, y, pixel);
for (int c = 0; c < channels; c++) {
int v = (int) (511 * logTable[pixel[c]] / (16 * log2));
if (v > 255) bins[c][v - 256]++;
else bins[c][0]++;
}
}
}
bins = hist.getBins();
}
private BufferedImage cropScaleGrayscale(Rectangle visibleRect, RenderedImage image) {
int minX = image.getMinX();
int minY = image.getMinY();
int width = image.getWidth();
int height = image.getHeight();
Rectangle bounds = new Rectangle(minX, minY, width, height);
visibleRect = bounds.intersection(visibleRect);
if (bounds.contains(visibleRect)) {
ParameterBlock pb = new ParameterBlock();
pb.addSource(image);
pb.add((float) visibleRect.x);
pb.add((float) visibleRect.y);
pb.add((float) visibleRect.width);
pb.add((float) visibleRect.height);
image = JAI.create("Crop", pb, JAIContext.noCacheHint);
}
Dimension previewSize = getSize();
if ((visibleRect.width > previewSize.width) || (visibleRect.height > previewSize.height)) {
float scale =
Math.min(
previewSize.width / (float) visibleRect.width,
previewSize.height / (float) visibleRect.height);
image = ConvolveDescriptor.create(image, Functions.getGaussKernel(.25 / scale), null);
ParameterBlock pb = new ParameterBlock();
pb.addSource(image);
pb.add(scale);
pb.add(scale);
image = JAI.create("Scale", pb, JAIContext.noCacheHint);
}
image = Functions.toColorSpace(image, JAIContext.systemColorSpace, null);
if (image.getSampleModel().getDataType() == DataBuffer.TYPE_USHORT) {
image = Functions.fromUShortToByte(image, null);
}
return Functions.toFastBufferedImage(image);
}
protected synchronized void paintComponent(Graphics gr) {
Graphics2D g2d = (Graphics2D) gr;
if (bins == null) engine.update(null, false);
Dimension bounds = getSize();
final float minx = 0;
final float miny = 0;
final float width = bounds.width;
final float height = bounds.height - 18;
g2d.setColor(Color.lightGray);
g2d.fill(new Rectangle2D.Float(minx, miny, width, height + 18));
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
if (bins != null) {
final int max = binmax();
class scaler {
int yscale(double y) {
return (int) (height - (height - 4) * (y / (double) max) + 0.5 + miny);
}
}
scaler s = new scaler();
for (int c = 0; c < bins.length; c++) {
Color color = Color.BLACK;
if (bins.length > 1)
switch (c) {
case 0:
color = Color.RED;
break;
case 1:
color = Color.GREEN;
break;
case 2:
color = Color.BLUE;
break;
}
g2d.setColor(color);
int numBins = bins[c].length;
int zeroY = s.yscale(0);
float xstep = (width + 1) / numBins;
GeneralPath gp = new GeneralPath();
gp.moveTo(minx, zeroY);
float lastx = minx;
float lasty = zeroY;
for (int i = 0; i < numBins; i++) {
int y = s.yscale(bins[c][i]);
float x = xstep * i + minx;
if (lasty != zeroY || y != zeroY) {
gp.lineTo(x, y);
lastx = x;
lasty = y;
}
}
if (lasty != zeroY) gp.lineTo(lastx, zeroY);
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.4f));
g2d.fill(gp);
g2d.setComposite(AlphaComposite.SrcOver);
g2d.draw(gp);
}
}
float step = width / 16.0f;
for (int i = 0; i < 16; i++) {
if (i == currentFocusZone) g2d.setColor(Color.yellow);
else {
float color = (float) ((Math.pow(2, i * 8.0 / (16 - 1)) - 1) / 255.);
float[] srgbColor =
Functions.fromLinearToCS(
JAIContext.systemColorSpace, new float[] {color, color, color});
g2d.setColor(
new Color(
(int) (255 * srgbColor[0]),
(int) (255 * srgbColor[1]),
(int) (255 * srgbColor[2])));
}
g2d.fill(new Rectangle2D.Float(minx + step * i, height + miny, step + 0.5f, 18));
}
}
static {
for (int i = 0; i < 0x10000; i++) logTable[i] = (float) Math.log1p(i);
}