com.idrsolutions.pdf.color.shading.FunctionContext Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Show all versions of OpenViewerFX Show documentation
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 1997-2015 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
*
* ---------------
* FunctionContext.java
* ---------------
*/
package com.idrsolutions.pdf.color.shading;
import java.awt.Color;
import java.awt.PaintContext;
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.parser.DecoderOptions;
public class FunctionContext implements PaintContext {
final GenericColorSpace shadingColorSpace;
private float scaling=1f;
private final PDFFunction[] function;
//private FunctionContext(){}
private final int pageHeight;
private final boolean colorsReversed;
private int xstart,ystart;
//private float[] domain;
FunctionContext(final int pHeight, final float scaling, final GenericColorSpace shadingColorSpace, final boolean colorsReversed, final PDFFunction[] function){
this.colorsReversed=colorsReversed;
this.pageHeight=pHeight;
//this.domain=domain;
this.shadingColorSpace=shadingColorSpace;
this.function = function;
this.scaling=scaling;
}
@Override
public void dispose() {}
@Override
public ColorModel getColorModel() { return ColorModel.getRGBdefault(); }
/**
* setup the raster with the colors
* */
@Override
public Raster getRaster(final int xstart, final int ystart, final int w, final int h) {
this.xstart=xstart;
this.ystart=ystart;
//sets up the array of pixel values
//WritableRaster raster =getColorModel().createCompatibleWritableRaster(w, h);
//create buffer to hold all this data
final int[] data = new int[w * h * 4];
//workout color range
Color c;
//set current calues to default
int cr,cg,cb;
//y co-ordinates
for (int y = 0; y < h; y++) {
//x co-ordinates
for (int x = 0; x < w; x++) {
c= calculateColor(x,y);
/**
* workout values
*/
if(colorsReversed){
cr=255-c.getRed();
cg=255-c.getGreen();
cb=255-c.getBlue();
}else{
cr=c.getRed();
cg=c.getGreen();
cb=c.getBlue();
}
//set color for the pixel with values
final int base = (y * w + x) * 4;
data[base] = cr;
data[base + 1] = cg;
data[base + 2] = cb;
data[base + 3] = 255;//(int)(col.getAlpha());
}
}
//set values
final WritableRaster raster = new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB).getRaster();
raster.setPixels(0, 0, w, h, data);
return raster;
}
/**workout rgb color*/
private Color calculateColor(final float x, final float y) {
final float cx;
final float cy;
/**
*take x and y and pass through conversion with domain values - this gives us xx
*/
//hack for MAC which is f**king broken
if(DecoderOptions.isRunningOnMac){
cx=scaling*(x+xstart);
cy=scaling*(y+ystart);
}else{
cx=scaling*(x+xstart);
cy=scaling*(pageHeight-(y+ystart));
}
final float[] values={cx,cy};
final float[] colValues = ShadingFactory.applyFunctions(function,values);
/**
* this value is converted to a color
*/
final int count=colValues.length;
shadingColorSpace.setColor(colValues,count);
return (Color) shadingColorSpace.getColor();
}
}