org.jpedal.examples.handlers.ExampleImageDrawOnScreenHandler Maven / Gradle / Ivy
/*
* ===========================================
* 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
*
* ---------------
* ExampleImageDrawOnScreenHandler.java
* ---------------
*/
package org.jpedal.examples.handlers;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.constants.PDFImageProcessing;
import org.jpedal.io.ObjectStore;
import org.jpedal.color.ColorSpaces;
import java.awt.image.*;
import java.awt.geom.AffineTransform;
import java.awt.*;
/**
* example code to plugin external image handler. Code to enable commented out in Viewer
*/
public class ExampleImageDrawOnScreenHandler implements org.jpedal.external.ImageHandler {
//tell JPedal if it ignores its own Image code or not
@Override
public boolean alwaysIgnoreGenericHandler() {
return false; //To change body of implemented methods use File | Settings | File Templates.
}//pass in raw data for image handling - if valid image returned it will be used.
//if alwaysIgnoreGenericHandler() is true JPedal code always ignored. If false, JPedal code used if null
@Override
public BufferedImage processImageData(final GraphicsState gs, final PdfObject XObject) {
return null; //To change body of implemented methods use File | Settings | File Templates.
}
@Override
public boolean imageHasBeenScaled() {
return false; //To change body of implemented methods use File | Settings | File Templates.
}
@Override
public boolean drawImageOnscreen(BufferedImage image, final int optionsApplied, AffineTransform upside_down,
final String currentImageFile, final Graphics2D g2, final boolean renderDirect,
final ObjectStore objectStoreRef, final boolean isPrinting) {
//this is the draw code from DynamicVectorRenderer as at 11th June 2007
final double[] values=new double[6];
upside_down.getMatrix(values);
final boolean isSlightlyRotated=(values[0]*values[1]!=0)||(values[2]*values[3]!=0);
//accelerate large bw images non-rotated
//accelerate large bw images non-rotated (use for all images for moment)
if(isSlightlyRotated || image.getWidth()<800 || renderDirect){ //image.getType()!=12 || CTM[0][0]<0 || CTM[1][1]<0 || CTM[1][0]<0 || CTM[0][1]<0)
g2.drawImage(image,upside_down,null);
}else{ //speedup large straightforward images
double dy=0,dx=0;
//if already turned, tweak transform
if(optionsApplied!=PDFImageProcessing.NOTHING){
//int count=values.length;
//for(int jj=0;jj0 && values[3]<0 &&(optionsApplied & PDFImageProcessing.IMAGE_INVERTED)==PDFImageProcessing.IMAGE_INVERTED){
final double newWidth= (values[0]*image.getWidth());
final double newHeight= -((values[3]*image.getHeight()));
dy=values[5]-newHeight;
values[5]=newHeight;
//allow for rounding error in scaling
if(newWidth-(int)newWidth>0.5){
dx -= 1;
}
}else if(values[0]<0 && values[3]>0){
final double tmp1=values[0];
//double tmp3=values[2];
values[0]=values[3];
values[3]=tmp1;
values[4]=0;
values[5]=(int)(values[4]*image.getHeight()/image.getWidth());
}
} else if(values[0]>0 && values[3]>0 &&(optionsApplied & PDFImageProcessing.IMAGE_INVERTED)==PDFImageProcessing.IMAGE_INVERTED){
dy=values[5];
final double tmp1=values[0];
//double tmp3=values[2];
values[0]=values[3];
values[3]=tmp1;
values[4]=0;
values[5]=(int)(values[4]*image.getHeight()/image.getWidth());
}else{
//
}
upside_down=new AffineTransform(values);
}
boolean imageProcessed=true;
try{
final AffineTransformOp invert =new AffineTransformOp(upside_down,ColorSpaces.hints);
image=invert.filter(image,null);
}catch(final Exception ee){
imageProcessed=false;
ee.printStackTrace();
}catch(final Error err){
imageProcessed=false;
//
}
if(imageProcessed){
Shape rawClip=null;
if(isPrinting && dy==0){ //adjust to fit
final double[] affValues=new double[6];
g2.getTransform().getMatrix(affValues);
//for(int i=0;i<6;i++)
//System.out.println(i+"="+affValues[i]);
dx=affValues[4]/affValues[0];
if(dx>0) {
dx = -dx;
}
dy=affValues[5]/affValues[3];
if(dy>0) {
dy = -dy;
}
dy=-(dy+image.getHeight());
}
//stop part pixels causing black lines
if(dy!=0){
rawClip=g2.getClip();
final int xDiff;
final double xScale=g2.getTransform().getScaleX();
if(xScale<1) {
xDiff = (int) (1 / xScale);
} else {
xDiff = (int) (xScale + 0.5d);
}
final int yDiff;
final double yScale=g2.getTransform().getScaleY();
if(yScale<1) {
yDiff = (int) (1 / yScale);
} else {
yDiff = (int) (yScale + 0.5d);
}
g2.clipRect((int)dx,(int)(dy+1.5),image.getWidth()-xDiff,image.getHeight()-yDiff);
}
g2.drawImage(image,(int)dx, (int) dy,null);
//put it back
if(rawClip!=null) {
g2.setClip(rawClip);
}
}else {
g2.drawImage(image, upside_down, null);
}
}
return true; //To change body of implemented methods use File | Settings | File Templates.
}
}
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