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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
*
* ---------------
* FormFlattener.java
* ---------------
*/
package org.jpedal.parser;
import java.awt.Rectangle;
import java.awt.geom.Area;
import java.awt.image.BufferedImage;
import org.jpedal.exception.PdfException;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.TextState;
import org.jpedal.objects.acroforms.creation.AnnotationFactory;
import org.jpedal.objects.acroforms.overridingImplementations.ReadOnlyTextIcon;
import org.jpedal.objects.raw.FormObject;
import org.jpedal.objects.raw.FormStream;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.parser.image.mask.MaskUtils;
import org.jpedal.render.ClipUtils;
public class FormFlattener {
/**
* routine to decode an XForm stream
* @param pdfStreamDecoder
* @param form
* @param isHTML
* @param AcroRes
* @throws org.jpedal.exception.PdfException
*/
public void drawFlattenedForm(final PdfStreamDecoder pdfStreamDecoder, final PdfObject form, final boolean isHTML, final PdfObject AcroRes) throws PdfException {
//Check org.jpedal.removeForms and stop rendering if form should be removed
if(exclusionOption!=FormExclusion.ExcludeNone && !showForm(form)){
return;
}
/*
* ignore if not going to be drawn
*/
//int type=form.getParameterConstant(PdfDictionary.Subtype);
//if(type==PdfDictionary.Link)
// return;
final int type = form.getParameterConstant(PdfDictionary.Subtype);
if (type == PdfDictionary.Highlight) {
AnnotationFactory.renderFlattenedAnnotation(form, pdfStreamDecoder.current, pdfStreamDecoder.parserOptions.getPageNumber(), pdfStreamDecoder.pageData.getRotation(pdfStreamDecoder.parserOptions.getPageNumber()));
return;
}
//save and use new version so we can ignore changes
final GraphicsState oldGS = pdfStreamDecoder.gs;
pdfStreamDecoder.gs =new GraphicsState();
pdfStreamDecoder.parserOptions.setFlattenedForm(true);
//check if this form should be displayed
final boolean[] characteristic = ((FormObject)form).getCharacteristics();
if (characteristic[0] || characteristic[1] || characteristic[5] ||
(!form.getBoolean(PdfDictionary.Open) &&
form.getParameterConstant(PdfDictionary.Subtype)==PdfDictionary.Popup)){
//this form should be hidden
return;
}
PdfObject imgObj = null;
final PdfObject APobjN = form.getDictionary(PdfDictionary.AP).getDictionary(PdfDictionary.N);
if(APobjN!=null || form.getDictionary(PdfDictionary.MK).getDictionary(PdfDictionary.I) !=null){
final String defaultState = form.getName(PdfDictionary.AS);
final Object[] values= FormStream.getNormalKeyValues(form, pdfStreamDecoder.currentPdfFile.getObjectReader());
if (defaultState != null && defaultState.equals(((FormObject)form).getNormalOnState())) {
((FormObject)form).setNormalOnState((String) values[0]);
imgObj =(PdfObject) values[1];
}else{
imgObj =(PdfObject) values[2];
}
}
/*
* we have some examples where no text inside AP datastream so we ignore in this case
* and use the text
*/
if(imgObj!=null){
final byte[] formData=imgObj.getDecodedStream(); //get from the AP
if(formData!=null){
final String str=new String(formData);
//if((str.contains("BMC")&& !str.contains("BT"))) {
if(str.isEmpty() || (str.contains("BMC")&& !str.contains("BT"))) {
imgObj = null;
}
}
}
/*
* alternative to draw image for icon
*/
final byte[] DA=form.getTextStreamValueAsByte(PdfDictionary.DA);
/*
* if no object present try to create a fake one using Swing code
* for readonly text icons
*/
if(imgObj==null){
String V = form.getTextStreamValue(PdfDictionary.V);
if(V==null && type == PdfDictionary.FreeText){
V=form.getTextStreamValue(PdfDictionary.Contents);
}
if (DA != null || (V != null && !V.isEmpty())) {
final ReadOnlyTextIcon textIcon = new ReadOnlyTextIcon(form,0, pdfStreamDecoder.currentPdfFile, AcroRes);
textIcon.decipherAppObject((FormObject) form);
if (V != null) {
textIcon.setText(V);
imgObj = textIcon.getFakeObject();
} else if (DA != null) {
imgObj = textIcon.getFakeObject();
imgObj.setDecodedStream(DA);
}
}
if(imgObj==null && DA==null){
//if(form.getParameterConstant(PdfDictionary.Subtype)!=PdfDictionary.Link)
// System.out.println("missing image "+PdfDictionary.showAsConstant(form.getParameterConstant(PdfDictionary.Subtype))+" "+form.getObjectRefAsString());
//add in Popup Icon for text Annotation
// int type = form.getParameterConstant(PdfDictionary.Subtype);
if (type == PdfDictionary.Text) {
AnnotationFactory.renderFlattenedAnnotation(form, pdfStreamDecoder.current, pdfStreamDecoder.parserOptions.getPageNumber(), pdfStreamDecoder.pageData.getRotation(pdfStreamDecoder.parserOptions.getPageNumber()));
}
return;
}
}
if(imgObj!=null) {
pdfStreamDecoder.currentPdfFile.checkResolved(imgObj);
}
byte[] formData=null; //get from the Fake obj
if(imgObj!=null) {
formData = imgObj.getDecodedStream(); //get from the DA
}
//debug code for mark, for the flattern case 10295
// System.out.println("ref="+form.getObjectRefAsString()+" stream="+new String(formData));
//might be needed to pick up fonts
if(imgObj!=null){
final PdfObject resources = imgObj.getDictionary(PdfDictionary.Resources);
if(resources!=null) {
pdfStreamDecoder.readResources(resources, false);
}
}
/*
* see if bounding box and set
*/
float[] BBox=form.getFloatArray(PdfDictionary.Rect);
if(imgObj!=null && imgObj.getObjectType()==PdfDictionary.XFA_APPEARANCE){
final Rectangle rect=((FormObject)form).getBoundingRectangle();
if(rect!=null){
BBox=new float[]{rect.x,rect.y,rect.width,rect.height};
}
}
if(BBox==null){
BBox=new float[]{0,0,1,1};
}
//we need to factor in this to calculations
final int pageRotation= pdfStreamDecoder.pageData.getRotation(pdfStreamDecoder.parserOptions.getPageNumber());
if (pageRotation == 0) {
if (BBox[1] > BBox[3]) {
final float t = BBox[1];
BBox[1] = BBox[3];
BBox[3] = t;
}
if (BBox[0] > BBox[2]) {
final float t = BBox[0];
BBox[0] = BBox[2];
BBox[2] = t;
}
}
//if we flatten form objects with XForms, we need to use diff calculation
if(pdfStreamDecoder.parserOptions.isFlattenedForm()){
pdfStreamDecoder.parserOptions.setOffsets(BBox[0], BBox[1]);
}
//please dont delete through merge this fixes most of the flatten form positionsing.
float[] matrix= {1,0,0,1,0,0};
if(imgObj!=null) {
matrix = imgObj.getFloatArray(PdfDictionary.Matrix);
}
float x = BBox[0],y = BBox[1];
Area newClip=null;
//check for null and then recalculate insets
if (matrix != null) {
float yScale = 1;
if (imgObj!=null && pageRotation == 0 && matrix[4]>0 && matrix[5]>0) {
final float[] BoundingBox = imgObj.getFloatArray(PdfDictionary.BBox);
if (BoundingBox[1] > BoundingBox[3]) {
final float t = BoundingBox[1];
BoundingBox[1] = BoundingBox[3];
BoundingBox[3] = t;
}
if (BoundingBox[0] > BoundingBox[2]) {
final float t = BoundingBox[0];
BoundingBox[0] = BoundingBox[2];
BoundingBox[2] = t;
}
matrix[0] = (BBox[2] - BBox[0]) / (BoundingBox[2] - BoundingBox[0]);
matrix[1] = 0;
matrix[2] = 0;
matrix[3] = (BBox[3] - BBox[1]) / (BoundingBox[3] - BoundingBox[1]);
matrix[4] = (BBox[0] - BoundingBox[0]);
matrix[5] = (BBox[1] - BoundingBox[1]);
pdfStreamDecoder.gs.CTM = new float[][]{{matrix[0],matrix[1],0},{matrix[2],matrix[3],0},{matrix[4],matrix[5],1}};
newClip=new Area(new Rectangle((int)BBox[0],(int)BBox[1],(int)((BBox[2]-BBox[0])+2),(int)((BBox[3]-BBox[1])+2)));
//Set variables for draw form call
x = (matrix[4]);
y = (matrix[5]);
} else {
//Check for appearnce stream
PdfObject temp = form.getDictionary(PdfDictionary.AP);
if (temp != null) {
//Check for N object
temp = temp.getDictionary(PdfDictionary.N);
if (temp != null) {
//Check for a bounding box of this object
final float[] BoundingBox = temp.getFloatArray(PdfDictionary.BBox);
if (BoundingBox != null) {
//If different from BB provided and matrix is standard than add scaling
if (BBox[0] != BoundingBox[0] && BBox[1] != BoundingBox[1]
&& BBox[2] != BoundingBox[2] && BBox[3] != BoundingBox[3]) {
if (//Check matrix is standard
matrix[0] * matrix[3] == 1.0f
&& matrix[1] * matrix[2] == 0.0f) {
//float bbw = BBox[2]-BBox[0];
final float bbh = BBox[3] - BBox[1];
//float imw = BoundingBox[2]-BoundingBox[0];
final float imh = BoundingBox[3] - BoundingBox[1];
//Adjust scale on the y to fit form size
if ((int) bbh != (int) imh) {
yScale = bbh / imh;
}
} else {
//-90 rotation
if (matrix[0] * matrix[3] == 0.0f
&& matrix[1] * matrix[2] == -1.0f) {
//float bbw = BBox[2]-BBox[0];
//Handle 0 rot case here
float bbh = BBox[2] - BBox[0];
switch (pageRotation) {
case 90:
bbh = BBox[2] - BBox[0];
break;
case 180:
break;
case 270:
bbh = BBox[2] - BBox[0];
break;
}
//float imw = BoundingBox[2]-BoundingBox[0];
final float imh = BoundingBox[3] - BoundingBox[1];
//Adjust scale on the y to fit form size
if ((int) bbh != (int) imh) {
yScale = bbh / imh;
}
}
}
}
}
}
}
switch (pageRotation) {
case 90:
//Allow for rotated forms, form requires lowest value
if (BBox[0] < BBox[2]) {
x = BBox[0] + (matrix[4] * yScale);
} else {
x = BBox[2] + (matrix[4] * yScale);
}
//Added code to fix ny1981.pdf and 133419-without-annotations-p2.pdf
if (matrix[4] < 0) {
x = BBox[0] + (matrix[4] * yScale);
}
//newClip=new Area(new Rectangle((int)BBox[2],(int)BBox[1],(int)BBox[0],(int)BBox[3]));
break;
default:
x = BBox[0] + (matrix[4] * yScale);
newClip = new Area(new Rectangle((int) (BBox[0]-1), (int) (BBox[1]-1), (int) ((BBox[2] - BBox[0])+2), (int) ((BBox[3] - BBox[1])+2)));
break;
}
y = BBox[1] + (matrix[5] * yScale);
//set gs.CTM to form coords (probably {1,0,0}{0,1,0}{x,y,1} at a guess
pdfStreamDecoder.gs.CTM = new float[][]{{matrix[0] * yScale, matrix[1] * yScale, 0}, {matrix[2] * yScale, matrix[3] * yScale, 0}, {x, y, 1}};
}
}else{
newClip = setClipAndCTM(pdfStreamDecoder, form, imgObj, BBox, x, y);
}
//Convert clip here
newClip = ClipUtils.convertPDFClipToJavaClip(newClip);
drawForm(imgObj, form, pdfStreamDecoder, newClip, isHTML, BBox, x, y, formData, APobjN, oldGS);
}
Area setClipAndCTM(final PdfStreamDecoder pdfStreamDecoder, final PdfObject form, final PdfObject imgObj, final float[] BBox, final float x, final float y) {
final Area newClip;//If using AP, is a widget and not a signature there is a chance of incorrect AP scaling.
//Set CTM based on different between Form bounds and AP bounds
if (imgObj != null &&
form.getParameterConstant(PdfDictionary.Subtype) == PdfDictionary.Widget &&
form.getNameAsConstant(PdfDictionary.FT) != PdfDictionary.Sig) {
final float[] values2 = imgObj.getFloatArray(PdfDictionary.BBox);
if (values2 != null) {
float xScale = (BBox[2] - BBox[0]) / (values2[2] - values2[0]);
if (xScale < 0) {
xScale = -xScale;
}
float yScale = (BBox[3] - BBox[1]) / (values2[3] - values2[1]);
if (yScale < 0) {
yScale = -yScale;
}
pdfStreamDecoder.gs.CTM = new float[][]{{xScale, 0, 0}, {0, yScale, 0}, {x, y, 1}};
} else {
pdfStreamDecoder.gs.CTM = new float[][]{{1, 0, 0}, {0, 1, 0}, {x, y, 1}};
}
newClip = new Area(new Rectangle((int) BBox[0], (int) BBox[1], (int) BBox[2], (int) BBox[3]));
} else {
if(form.getParameterConstant(PdfDictionary.Subtype)==PdfDictionary.Ink){
pdfStreamDecoder.gs.CTM = new float[][]{{1, 0, 0}, {0, 1, 0}, {x-BBox[0], y-BBox[1], 1}};
}else{
pdfStreamDecoder.gs.CTM = new float[][]{{1, 0, 0}, {0, 1, 0}, {x, y, 1}};
}
newClip = new Area(new Rectangle((int) BBox[0], (int) BBox[1], (int) BBox[2], (int) BBox[3]));
}
return newClip;
}
void drawForm(final PdfObject imgObj, final PdfObject form, final PdfStreamDecoder pdfStreamDecoder, final Area newClip, final boolean isHTML, final float[] BBox, final float x, final float y, final byte[] formData, final PdfObject APobjN, final GraphicsState oldGS) throws PdfException {
//set clip to match bounds on form
if(newClip!=null) {
pdfStreamDecoder.gs.updateClip(new Area(newClip));
}
pdfStreamDecoder.current.drawClip(pdfStreamDecoder.gs, pdfStreamDecoder.parserOptions.defaultClip, false) ;
/*
* avoid values in main stream
*/
final TextState oldState= pdfStreamDecoder.gs.getTextState();
pdfStreamDecoder.gs.setTextState(new TextState());
/*
* write out forms as images in HTML mode - hooks into flatten forms mode
*/
if(isHTML){
//create the image from the form data
final int w=(int)(BBox[2]-BBox[0]);
final int h=(int) (BBox[3]-BBox[1]);
if(w>0 && h>0){
final BufferedImage image= MaskUtils.createTransparentForm(imgObj, 0, w, h, pdfStreamDecoder.currentPdfFile, pdfStreamDecoder.parserOptions, pdfStreamDecoder.formLevel, pdfStreamDecoder.multiplyer);
//draw the image to HTML
//4 needed as we upsample by a factor of 4
pdfStreamDecoder.gs.CTM=new float[][]{{image.getWidth()/4,0,1},{0,image.getHeight()/4,1},{0,0,0}};
pdfStreamDecoder.gs.x=x;
pdfStreamDecoder.gs.y=y;
//draw onto image
pdfStreamDecoder.gs.CTM[2][0]= x;
pdfStreamDecoder.gs.CTM[2][1]= y;
pdfStreamDecoder.current.drawImage(pdfStreamDecoder.parserOptions.getPageNumber(), image, pdfStreamDecoder.gs, false, form.getObjectRefAsString(), -2);
}
}else{
if(formData!=null){
pdfStreamDecoder.BBox=BBox;
pdfStreamDecoder.decodeStreamIntoObjects(formData, false);
pdfStreamDecoder.BBox=null;
}
}
/*
* we need to reset clip otherwise items drawn afterwards
* like forms data in image or print will not appear.
*/
pdfStreamDecoder.gs.updateClip(null);
pdfStreamDecoder.current.drawClip(pdfStreamDecoder.gs, null, true) ;
//restore
pdfStreamDecoder.gs =oldGS;
pdfStreamDecoder.gs.setTextState(oldState);
}
private enum FormExclusion {
ExcludeNone, ExcludeForms, ExcludeAnnotations, ExcludeFormsAndAnnotations
}
private static FormExclusion exclusionOption = FormExclusion.ExcludeNone;
static {
final String value = System.getProperty("org.jpedal.removeForms");
if (value != null && !value.isEmpty()) {
exclusionOption = FormExclusion.valueOf(value);
}
}
private static boolean showForm(final PdfObject form){
switch (exclusionOption) {
case ExcludeFormsAndAnnotations:
//Show no annotations or forms
return false;
case ExcludeAnnotations:
//Show only forms
if (form.getParameterConstant(PdfDictionary.Type) == PdfDictionary.Annot && form.getNameAsConstant(PdfDictionary.FT) == -1) {
return false;
}
break;
case ExcludeForms:
//Show only annotations
if (form.getNameAsConstant(PdfDictionary.FT) != -1) {
return false;
}
break;
case ExcludeNone:
//Show both annotations and forms
break;
}
return true;
}
}