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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library 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 2.1 of the License, or (at your option) any later version.
This library 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 GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* RadialContext.java
* ---------------
*/
package com.idrsolutions.pdf.color.shading;
import java.awt.Color;
import java.awt.PaintContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.function.PDFFunction;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.utils.LogWriter;
public class RadialContext implements PaintContext {
private final GenericColorSpace shadingColorSpace;
private final float[] background;
private final PdfObject shadingObj;
private final PDFFunction[] function;
private final float[] coords;
private boolean[] extended = {false, false};
private float t0;
private float t1 = 1.0f;
private final float x0, y0, r0, x1, y1, r1, deltaX, deltaY, deltaR, deltaC, powerR0;
private final Color colorT0, colorT1;
AffineTransform inversed = new AffineTransform();
RadialContext(final AffineTransform xForm, final GenericColorSpace shadingColorSpace, final float[] background, final PdfObject shading, final float[][] mm, final PDFFunction[] function) {
this.shadingColorSpace = shadingColorSpace;
this.background = background;
this.shadingObj = shading;
this.function = function;
final float[] src = shading.getFloatArray(PdfDictionary.Coords);
final boolean[] extension = shadingObj.getBooleanArray(PdfDictionary.Extend);
if (extension != null) {
extended = extension;
}
final float[] domain = shadingObj.getFloatArray(PdfDictionary.Domain);
if (domain != null) {
t0 = domain[0];
t1 = domain[1];
}
coords = new float[src.length];
System.arraycopy(src, 0, coords, 0, src.length);
AffineTransform shadeAffine = new AffineTransform();
if (mm != null) {
shadeAffine = new AffineTransform(mm[0][0], mm[0][1], mm[1][0], mm[1][1], mm[2][0], mm[2][1]);
}
try {
final AffineTransform invXF = xForm.createInverse();
final AffineTransform invSH = shadeAffine.createInverse();
invSH.concatenate(invXF);
inversed = (AffineTransform)invSH.clone();
} catch (final NoninvertibleTransformException ex) {
LogWriter.writeLog("Exception "+ex+ ' ');
}
x0 = coords[0];
y0 = coords[1];
r0 = coords[2];
x1 = coords[3];
y1 = coords[4];
r1 = coords[5];
colorT0 = calculateColor(t0);
colorT1 = calculateColor(t1);
//dont use Math.pow functions here;
deltaX = x1 - x0;
deltaY = y1 - y0;
deltaR = r1 - r0;
deltaC = deltaX * deltaX + deltaY * deltaY - deltaR * deltaR;
powerR0 = r0 * r0;
// System.out.println("page height "+pageHeight+" offx"+offX+" offY"+offY+" pagew"+cropX);
}
@Override
public void dispose() {
}
@Override
public ColorModel getColorModel() {
return ColorModel.getRGBdefault();
}
private Color calculateColor(final float val) {
final float[] colValues = ShadingFactory.applyFunctions(function, new float[]{val});
shadingColorSpace.setColor(colValues, colValues.length);
return (Color) shadingColorSpace.getColor();
}
@Override
public Raster getRaster(final int startX, final int startY, final int w, final int h) {
final int[] data = new int[w * h * 4];
if (background != null) {
shadingColorSpace.setColor(background, shadingColorSpace.getColorComponentCount());
final Color c = (Color) shadingColorSpace.getColor();
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
final int base = (y * w + x) * 4;
data[base] = c.getRed();
data[base + 1] = c.getGreen();
data[base + 2] = c.getBlue();
data[base + 3] = 255;
}
}
}
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
final float[] xy = { startX + x, startY + y};
inversed.transform(xy, 0, xy, 0, 1);
Color result = null;
final float[] qr = quadraticEquate(xy[0], xy[1]);
if (qr[1] >= 0 && qr[1] <= 1) {
result = calculateColor(getTfromS(qr[1]));
} else if (extended[1] && qr[1] >= 0 && r1 + qr[1] * deltaR >= 0) {
result = colorT1;
} else if (qr[0] >= 0 && qr[0] <= 1) {
result = calculateColor(getTfromS(qr[0]));
} else if (extended[0] && qr[1] <= 0 && r1 + qr[1] * deltaR >= 0) {
result = calculateColor(getTfromS(qr[1]));
} else if (extended[0] && qr[0] <= 1 && r1 + qr[0] * deltaR >= 0) {
result = colorT0;
}
if (result != null) {
final int base = (y * w + x) * 4;
data[base] = result.getRed();
data[base + 1] = result.getGreen();
data[base + 2] = result.getBlue();
data[base + 3] = 255;
}
}
}
final WritableRaster raster = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB).getRaster();
raster.setPixels(0, 0, w, h, data);
return raster;
}
private float getTfromS(final float s) {
return (s * (t1 - t0)) + t0;
}
private float[] quadraticEquate(final float x, final float y) {
final float xDiff = x - x0;
final float yDiff = y - y0;
final float p = -xDiff * deltaX - yDiff * deltaY - r0 * deltaR;
final float q = xDiff * xDiff + yDiff * yDiff - powerR0; //dont use Math.pow to xdiff,ydiff;
final float sqrt = (float) Math.sqrt(p * p - deltaC * q);
final float sA = (sqrt - p) / deltaC;
final float sB = (-p - sqrt) / deltaC;
return ((deltaC < 0) ? new float[]{sA, sB} : new float[]{sB, sA});
}
}