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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
*
* ---------------
* FunctionShadeContext.java
* ---------------
*/
package com.idrsolutions.pdf.color.shading;
import java.awt.Color;
import java.awt.PaintContext;
import java.awt.geom.AffineTransform;
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.Matrix;
/**
*
* @author suda
*/
public class FunctionShadeContext implements PaintContext {
private final GenericColorSpace shadingColorSpace;
private final PDFFunction[] function;
private final float[] background;
private float[] domain = {0f, 1f, 0f, 1f};
private final float[][] toUserSpace;
private final float[][] toShadeSpace;
// private final float[] BBox;
public FunctionShadeContext(final AffineTransform xform, final GenericColorSpace shadingColorSpace, final float[] background, final PdfObject shadingObject, final float[][] mm, final PDFFunction[] function) {
this.shadingColorSpace = shadingColorSpace;
this.function = function;
final float[] newDomain = shadingObject.getFloatArray(PdfDictionary.Domain);
if (newDomain != null) {
domain = newDomain;
}
this.background = background;
float[][] caller = {{1,0,0},{0,1,0},{0,0,1}};
float[][] shadeMatrix = {{1,0,0},{0,1,0},{0,0,1}};
if (mm != null) {
caller = mm;
}
final float [] inputs = shadingObject.getFloatArray(PdfDictionary.Matrix);
if(inputs != null){
shadeMatrix = new float[][]{{inputs[0],inputs[1],0},{inputs[2],inputs[3],0},{inputs[4],inputs[5],1}};
}
final float[][] shader = Matrix.concatenate(caller, shadeMatrix);
// BBox = shadingObject.getFloatArray(PdfDictionary.BBox);
final float[][] xformMatrix = {
{(float) xform.getScaleX(), (float) xform.getShearX(), 0},
{(float) xform.getShearY(), (float) xform.getScaleY(), 0},
{(float) xform.getTranslateX(), (float) xform.getTranslateY(), 1}
};
toUserSpace = Matrix.inverse(xformMatrix);
toShadeSpace = Matrix.inverse(shader);
}
@Override
public void dispose() {
}
@Override
public ColorModel getColorModel() {
return ColorModel.getRGBdefault();
}
@Override
public Raster getRaster(final int startX, final int startY, final int w, final int h) {
final int rastSize = (w * h * 4);
final int[] data = new int[rastSize];
if (background != null) {
shadingColorSpace.setColor(background, 4);
final Color c = (Color) shadingColorSpace.getColor();
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
final int base = (i * w + j) * 4;
data[base] = c.getRed();
data[base + 1] = c.getGreen();
data[base + 2] = c.getBlue();
data[base + 3] = 255;
}
}
}
float x, y;
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
float[] src = {startX + j, startY + i};
src = Matrix.transformPoint(toUserSpace, src[0], src[1]);
src = Matrix.transformPoint(toShadeSpace, src[0], src[1]);
x = src[0];
y = src[1];
if (x < domain[0] || x > domain[1] || y < domain[2] || y > domain[3]) {
continue;
}
final Color c = calculateColor(new float[]{x, y});
if (c != null) {
final int base = (i * w + j) * 4;
data[base] = c.getRed();
data[base + 1] = c.getGreen();
data[base + 2] = c.getBlue();
data[base + 3] = c.getAlpha();
}
}
}
final WritableRaster raster = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB).getRaster();
raster.setPixels(0, 0, w, h, data);
return raster;
}
private Color calculateColor(final float[] val) {
final Color col;
final float[] colValues = ShadingFactory.applyFunctions(function, val);
shadingColorSpace.setColor(colValues, colValues.length);
col = (Color) shadingColorSpace.getColor();
return col;
}
// public static GeneralPath transformBBox(float [][] matrix, float[] bbox){
//
// float[] p1 = {bbox[0],bbox[1]};
// float[] p2 = {bbox[2],bbox[1]};
// float[] p3 = {bbox[2],bbox[3]};
// float[] p4 = {bbox[0],bbox[3]};
//
// p1 = Matrix.transformPoint(matrix, p1[0], p1[1]);
// p2 = Matrix.transformPoint(matrix, p2[0], p2[1]);
// p3 = Matrix.transformPoint(matrix, p3[0], p3[1]);
// p4 = Matrix.transformPoint(matrix, p4[0], p4[1]);
//
// GeneralPath gp = new GeneralPath();
// gp.moveTo(p1[0], p1[1]);
// gp.lineTo(p2[0], p2[1]);
// gp.lineTo(p3[0], p3[1]);
// gp.lineTo(p4[0], p4[1]);
// gp.closePath();
//
// return gp;
// }
}