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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
*
* ---------------
* RenderUtils.java
* ---------------
*/
package org.jpedal.render;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Area;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.*;
import org.jpedal.color.ColorSpaces;
import org.jpedal.utils.LogWriter;
/**
* static helper methods for rendering
*/
public class RenderUtils {
public static boolean isInverted(final float[][] CTM){
if(CTM[0][0]<0 && CTM[1][1]<1){
return false;
}else if(CTM[0][0]<0 && CTM[1][1]>1){
return false;
}else{
return CTM[0][0] < 0 || CTM[1][1] < 0;
}
}
public static BufferedImage invertImage(BufferedImage image) {
// if((CTM[0][0]==0 || CTM[1][1]==0) || (isRotated(CTM) && !isInverted(CTM))) {
// return image;
// }
//turn upside down
final AffineTransform image_at2 =new AffineTransform();
image_at2.scale(1,-1);
image_at2.translate(0,-image.getHeight());
AffineTransformOp invert3= new AffineTransformOp(image_at2, ColorSpaces.hints);
if(image.getType()==12){ //avoid turning into ARGB
final BufferedImage source=image;
image =new BufferedImage(source.getWidth(),source.getHeight(),source.getType());
invert3.filter(source,image);
}else{
boolean failed=false;
//allow for odd behaviour on some files
try{
image = invert3.filter(image,null);
}catch(final Exception e){
failed=true;
LogWriter.writeLog("Exception in handling image "+e);
}
if(failed){
try{
invert3 = new AffineTransformOp(image_at2,null);
image = invert3.filter(image,null);
}catch(final Exception e){
LogWriter.writeLog("Caught a Exception " + e);
}
}
}
return image;
}
static BufferedImage invertImageBeforeSave(BufferedImage image, final boolean horizontal) {
//turn upside down
final AffineTransform image_at2 =new AffineTransform();
if(horizontal){
image_at2.scale(-1,1);
image_at2.translate(-image.getWidth(),0);
}else{
image_at2.scale(1,-1);
image_at2.translate(0,-image.getHeight());
}
final AffineTransformOp invert3= new AffineTransformOp(image_at2, ColorSpaces.hints);
if(image.getType()==12){ //avoid turning into ARGB
final BufferedImage source=image;
image =new BufferedImage(source.getWidth(),source.getHeight(),source.getType());
invert3.filter(source,image);
}else {
image = invert3.filter(image, null);
}
return image;
}
/**resize array*/
static float[] checkSize(float[] array, final int currentItem) {
final int size=array.length;
if(size<=currentItem){
final int newSize=size*2;
final float[] newArray=new float[newSize];
System.arraycopy( array, 0, newArray, 0, size );
array=newArray;
}
return array;
}
/**
* update clip
* @param defaultClip
*/
public static void renderClip(final Area clip, final Rectangle dirtyRegion, final Shape defaultClip, final Graphics2D g2) {
if (g2 != null) {
if (clip != null) {
g2.setClip(clip);
//can cause problems in Canoo so limit effect if Canoo running
if (dirtyRegion != null)// && (!isRunningOnRemoteClient || clip.intersects(dirtyRegion)))
{
g2.clip(dirtyRegion);
}
} else {
g2.setClip(defaultClip);
}
}
}
//work out size glyph occupies
static Rectangle getAreaForGlyph(final float[][] trm){
//workout area
final int w=(int) Math.sqrt((trm[0][0]*trm[0][0])+(trm[1][0]*trm[1][0]));
final int h=(int) Math.sqrt((trm[1][1]*trm[1][1])+(trm[0][1]*trm[0][1]));
float xDiff = 0;
float yDiff = 0;
if(trm[0][0]<0) {
xDiff = trm[0][0];
} else if(trm[1][0]<0) {
xDiff = trm[1][0];
}
if(trm[1][1]<0) {
yDiff = trm[1][1];
} else if(trm[0][1]<0) {
yDiff = trm[0][1];
}
return (new Rectangle((int)(trm[2][0]+xDiff),(int)(trm[2][1]+yDiff),w,h));
}
/**
* Rectangle contains code does not handle negative values
* Use this instead.
* @param area : Rectangle to look in
* @param x : value on the x axis
* @param y : value on the y axis
* @return true is point is within area
*/
public static boolean rectangleContains(final int[] area, final int x, final int y){
int lowX = area[0];
int hiX = area[0]+area[2];
int lowY = area[1];
int hiY = area[1]+area[3];
boolean containsPoint = false;
//if negative value used swap the lowest and highest point
if(lowX>hiX){
final int temp = lowX;
lowX = hiX;
hiX = temp;
}
if(lowY>hiY){
final int temp = lowY;
lowY = hiY;
hiY = temp;
}
if((lowY < y && y < hiY) && (lowX < x && x < hiX)) {
containsPoint = true;
}
return containsPoint;
}
/**
* generic method to return a serilized object from an InputStream
*
* NOT PART OF API and subject to change (DO NOT USE)
*
* @param bis - ByteArrayInputStream containing serilized object
* @return - deserilized object
* @throws java.io.IOException
* @throws ClassNotFoundException
*/
public static Object restoreFromStream(final ByteArrayInputStream bis) throws IOException, ClassNotFoundException{
//turn back into object
final ObjectInput os=new ObjectInputStream(bis);
return os.readObject();
}
/**
* generic method to serilized an object to an OutputStream
*
* NOT PART OF API and subject to change (DO NOT USE)
*
*
* @param bos - ByteArrayOutputStream to serilize to
* @param obj - object to serilize
* @throws java.io.IOException
*/
public static void writeToStream(final ByteArrayOutputStream bos, final Object obj) throws IOException {
final ObjectOutput os=new ObjectOutputStream(bos);
os.writeObject(obj);
os.close();
}
}