/*
* $Id: PdfContentStreamProcessor.java 4923 2011-07-05 15:13:19Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2011 1T3XT BVBA
* Authors: Kevin Day, Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.parser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.pdf.CMapAwareDocumentFont;
import com.itextpdf.text.pdf.PRIndirectReference;
import com.itextpdf.text.pdf.PRTokeniser;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfContentParser;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfIndirectReference;
import com.itextpdf.text.pdf.PdfLiteral;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfNumber;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfStream;
import com.itextpdf.text.pdf.PdfString;
/**
* Processor for a PDF content Stream.
* @since 2.1.4
*/
public class PdfContentStreamProcessor {
/**
* Default operator
* @since 5.0.1
*/
public static final String DEFAULTOPERATOR = "DefaultOperator";
/** A map with all supported operators operators (PDF syntax). */
final private Map<String, ContentOperator> operators;
/** Resources for the content stream. */
private ResourceDictionary resources;
/** Stack keeping track of the graphics state. */
private final Stack<GraphicsState> gsStack = new Stack<GraphicsState>();
/** Text matrix. */
private Matrix textMatrix;
/** Text line matrix. */
private Matrix textLineMatrix;
/** Listener that will be notified of render events */
final private RenderListener renderListener;
/** A map with all supported XObject handlers */
final private Map<PdfName, XObjectDoHandler> xobjectDoHandlers;
/**
* The font cache.
* @since 5.0.6
*/
/** */
final private Map<Integer,CMapAwareDocumentFont> cachedFonts = new HashMap<Integer, CMapAwareDocumentFont>();
/**
* A stack containing marked content info.
* @since 5.0.2
*/
private final Stack<MarkedContentInfo> markedContentStack = new Stack<MarkedContentInfo>();
/**
* Creates a new PDF Content Stream Processor that will send it's output to the
* designated render listener.
*
* @param renderListener the {@link RenderListener} that will receive rendering notifications
*/
public PdfContentStreamProcessor(RenderListener renderListener) {
this.renderListener = renderListener;
operators = new HashMap<String, ContentOperator>();
populateOperators();
xobjectDoHandlers = new HashMap<PdfName, XObjectDoHandler>();
populateXObjectDoHandlers();
reset();
}
private void populateXObjectDoHandlers(){
registerXObjectDoHandler(PdfName.DEFAULT, new IgnoreXObjectDoHandler());
registerXObjectDoHandler(PdfName.FORM, new FormXObjectDoHandler());
registerXObjectDoHandler(PdfName.IMAGE, new ImageXObjectDoHandler());
}
/**
* Registers a Do handler that will be called when Do for the provided XObject subtype is encountered during content processing.
* <br>
* If you register a handler, it is a very good idea to pass the call on to the existing registered handler (returned by this call), otherwise you
* may inadvertently change the internal behavior of the processor.
* @param xobjectSubType the XObject subtype this handler will process, or PdfName.DEFAULT for a catch-all handler
* @param handler the handler that will receive notification when the Do operator for the specified subtype is encountered
* @return the existing registered handler, if any
* @since 5.0.1
*/
public XObjectDoHandler registerXObjectDoHandler(PdfName xobjectSubType, XObjectDoHandler handler){
return xobjectDoHandlers.put(xobjectSubType, handler);
}
/**
* Gets the font pointed to by the indirect reference. The font may have been cached.
* @param ind the indirect reference ponting to the font
* @return the font
* @since 5.0.6
*/
public CMapAwareDocumentFont getFont(PRIndirectReference ind) {
Integer n = Integer.valueOf(ind.getNumber());
CMapAwareDocumentFont font = cachedFonts.get(n);
if (font == null) {
font = new CMapAwareDocumentFont(ind);
cachedFonts.put(n, font);
}
return font;
}
/**
* Loads all the supported graphics and text state operators in a map.
*/
private void populateOperators(){
registerContentOperator(DEFAULTOPERATOR, new IgnoreOperatorContentOperator());
registerContentOperator("q", new PushGraphicsState());
registerContentOperator("Q", new PopGraphicsState());
registerContentOperator("cm", new ModifyCurrentTransformationMatrix());
registerContentOperator("gs", new ProcessGraphicsStateResource());
SetTextCharacterSpacing tcOperator = new SetTextCharacterSpacing();
registerContentOperator("Tc", tcOperator);
SetTextWordSpacing twOperator = new SetTextWordSpacing();
registerContentOperator("Tw", twOperator);
registerContentOperator("Tz", new SetTextHorizontalScaling());
SetTextLeading tlOperator = new SetTextLeading();
registerContentOperator("TL", tlOperator);
registerContentOperator("Tf", new SetTextFont());
registerContentOperator("Tr", new SetTextRenderMode());
registerContentOperator("Ts", new SetTextRise());
registerContentOperator("BT", new BeginText());
registerContentOperator("ET", new EndText());
registerContentOperator("BMC", new BeginMarkedContent());
registerContentOperator("BDC", new BeginMarkedContentDictionary());
registerContentOperator("EMC", new EndMarkedContent());
TextMoveStartNextLine tdOperator = new TextMoveStartNextLine();
registerContentOperator("Td", tdOperator);
registerContentOperator("TD", new TextMoveStartNextLineWithLeading(tdOperator, tlOperator));
registerContentOperator("Tm", new TextSetTextMatrix());
TextMoveNextLine tstarOperator = new TextMoveNextLine(tdOperator);
registerContentOperator("T*", tstarOperator);
ShowText tjOperator = new ShowText();
registerContentOperator("Tj", new ShowText());
MoveNextLineAndShowText tickOperator = new MoveNextLineAndShowText(tstarOperator, tjOperator);
registerContentOperator("'", tickOperator);
registerContentOperator("\"", new MoveNextLineAndShowTextWithSpacing(twOperator, tcOperator, tickOperator));
registerContentOperator("TJ", new ShowTextArray());
registerContentOperator("Do", new Do());
}
/**
* Registers a content operator that will be called when the specified operator string is encountered during content processing.
* <br>
* If you register an operator, it is a very good idea to pass the call on to the existing registered operator (returned by this call), otherwise you
* may inadvertently change the internal behavior of the processor.
* @param operatorString the operator id, or DEFAULTOPERATOR for a catch-all operator
* @param operator the operator that will receive notification when the operator is encountered
* @return the existing registered operator, if any
* @since 2.1.7
*/
public ContentOperator registerContentOperator(String operatorString, ContentOperator operator){
return operators.put(operatorString, operator);
}
/**
* Resets the graphics state stack, matrices and resources.
*/
public void reset(){
gsStack.removeAllElements();
gsStack.add(new GraphicsState());
textMatrix = null;
textLineMatrix = null;
resources = new ResourceDictionary();
}
/**
* Returns the current graphics state.
* @return the graphics state
*/
private GraphicsState gs(){
return gsStack.peek();
}
/**
* Invokes an operator.
* @param operator the PDF Syntax of the operator
* @param operands a list with operands
*/
private void invokeOperator(PdfLiteral operator, ArrayList<PdfObject> operands) throws Exception{
ContentOperator op = operators.get(operator.toString());
if (op == null)
op = operators.get(DEFAULTOPERATOR);
op.invoke(this, operator, operands);
}
/**
* Add to the marked content stack
* @param tag the tag of the marked content
* @param dict the PdfDictionary associated with the marked content
* @since 5.0.2
*/
private void beginMarkedContent(PdfName tag, PdfDictionary dict) {
markedContentStack.push(new MarkedContentInfo(tag, dict));
}
/**
* Remove the latest marked content from the stack. Keeps track of the BMC, BDC and EMC operators.
* @since 5.0.2
*/
private void endMarkedContent() {
markedContentStack.pop();
}
/**
* Decodes a PdfString (which will contain glyph ids encoded in the font's encoding)
* based on the active font, and determine the unicode equivalent
* @param in the String that needs to be encoded
* @return the encoded String
* @since 2.1.7
*/
private String decode(PdfString in){
byte[] bytes = in.getBytes();
return gs().font.decode(bytes, 0, bytes.length);
}
/**
* Used to trigger beginTextBlock on the renderListener
*/
private void beginText(){
renderListener.beginTextBlock();
}
/**
* Used to trigger endTextBlock on the renderListener
*/
private void endText(){
renderListener.endTextBlock();
}
/**
* Displays text.
* @param string the text to display
*/
private void displayPdfString(PdfString string){
String unicode = decode(string);
TextRenderInfo renderInfo = new TextRenderInfo(unicode, gs(), textMatrix, markedContentStack);
renderListener.renderText(renderInfo);
textMatrix = new Matrix(renderInfo.getUnscaledWidth(), 0).multiply(textMatrix);
}
/**
* Displays an XObject using the registered handler for this XObject's subtype
* @param xobjectName the name of the XObject to retrieve from the resource dictionary
*/
private void displayXObject(PdfName xobjectName) throws IOException {
PdfDictionary xobjects = resources.getAsDict(PdfName.XOBJECT);
PdfObject xobject = xobjects.getDirectObject(xobjectName);
PdfStream xobjectStream = (PdfStream)xobject;
PdfName subType = xobjectStream.getAsName(PdfName.SUBTYPE);
if (xobject.isStream()){
XObjectDoHandler handler = xobjectDoHandlers.get(subType);
if (handler == null)
handler = xobjectDoHandlers.get(PdfName.DEFAULT);
handler.handleXObject(this, xobjectStream, xobjects.getAsIndirectObject(xobjectName));
} else {
throw new IllegalStateException(MessageLocalization.getComposedMessage("XObject.1.is.not.a.stream", xobjectName));
}
}
/**
* Adjusts the text matrix for the specified adjustment value (see TJ operator in the PDF spec for information)
* @param tj the text adjustment
*/
private void applyTextAdjust(float tj){
float adjustBy = -tj/1000f * gs().fontSize * gs().horizontalScaling;
textMatrix = new Matrix(adjustBy, 0).multiply(textMatrix);
}
/**
* Processes PDF syntax
* @param contentBytes the bytes of a content stream
* @param resources the resources that come with the content stream
*/
public void processContent(byte[] contentBytes, PdfDictionary resources){
this.resources.push(resources);
try {
PRTokeniser tokeniser = new PRTokeniser(contentBytes);
PdfContentParser ps = new PdfContentParser(tokeniser);
ArrayList<PdfObject> operands = new ArrayList<PdfObject>();
while (ps.parse(operands).size() > 0){
PdfLiteral operator = (PdfLiteral)operands.get(operands.size()-1);
if ("BI".equals(operator.toString())){
// we don't call invokeOperator for embedded images - this is one area of the PDF spec that is particularly nasty and inconsistent
PdfDictionary colorSpaceDic = resources.getAsDict(PdfName.COLORSPACE);
ImageRenderInfo renderInfo = ImageRenderInfo.createdForEmbeddedImage(gs().ctm, InlineImageUtils.parseInlineImage(ps, colorSpaceDic));
renderListener.renderImage(renderInfo);
} else {
invokeOperator(operator, operands);
}
}
}
catch (Exception e) {
throw new ExceptionConverter(e);
}
this.resources.pop();
}
/**
* A resource dictionary that allows stack-like behavior to support resource dictionary inheritance
*/
private static class ResourceDictionary extends PdfDictionary{
private final List<PdfDictionary> resourcesStack = new ArrayList<PdfDictionary>();
public ResourceDictionary() {
}
public void push(PdfDictionary resources){
resourcesStack.add(resources);
}
public void pop(){
resourcesStack.remove(resourcesStack.size()-1);
}
@Override
public PdfObject getDirectObject(PdfName key) {
for (int i = resourcesStack.size() - 1; i >= 0; i--){
PdfDictionary subResource = resourcesStack.get(i);
if (subResource != null){
PdfObject obj = subResource.getDirectObject(key);
if (obj != null) return obj;
}
}
return super.getDirectObject(key); // shouldn't be necessary, but just in case we've done something crazy
}
}
/**
* A content operator implementation (unregistered).
*/
private static class IgnoreOperatorContentOperator implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands){
// ignore the operator
}
}
/**
* A content operator implementation (TJ).
*/
private static class ShowTextArray implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfArray array = (PdfArray)operands.get(0);
float tj = 0;
for (Iterator<PdfObject> i = array.listIterator(); i.hasNext(); ) {
PdfObject entryObj = i.next();
if (entryObj instanceof PdfString){
processor.displayPdfString((PdfString)entryObj);
tj = 0;
} else {
tj = ((PdfNumber)entryObj).floatValue();
processor.applyTextAdjust(tj);
}
}
}
}
/**
* A content operator implementation (").
*/
private static class MoveNextLineAndShowTextWithSpacing implements ContentOperator{
private final SetTextWordSpacing setTextWordSpacing;
private final SetTextCharacterSpacing setTextCharacterSpacing;
private final MoveNextLineAndShowText moveNextLineAndShowText;
public MoveNextLineAndShowTextWithSpacing(SetTextWordSpacing setTextWordSpacing, SetTextCharacterSpacing setTextCharacterSpacing, MoveNextLineAndShowText moveNextLineAndShowText) {
this.setTextWordSpacing = setTextWordSpacing;
this.setTextCharacterSpacing = setTextCharacterSpacing;
this.moveNextLineAndShowText = moveNextLineAndShowText;
}
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber aw = (PdfNumber)operands.get(0);
PdfNumber ac = (PdfNumber)operands.get(1);
PdfString string = (PdfString)operands.get(2);
ArrayList<PdfObject> twOperands = new ArrayList<PdfObject>(1);
twOperands.add(0, aw);
setTextWordSpacing.invoke(processor, null, twOperands);
ArrayList<PdfObject> tcOperands = new ArrayList<PdfObject>(1);
tcOperands.add(0, ac);
setTextCharacterSpacing.invoke(processor, null, tcOperands);
ArrayList<PdfObject> tickOperands = new ArrayList<PdfObject>(1);
tickOperands.add(0, string);
moveNextLineAndShowText.invoke(processor, null, tickOperands);
}
}
/**
* A content operator implementation (').
*/
private static class MoveNextLineAndShowText implements ContentOperator{
private final TextMoveNextLine textMoveNextLine;
private final ShowText showText;
public MoveNextLineAndShowText(TextMoveNextLine textMoveNextLine, ShowText showText) {
this.textMoveNextLine = textMoveNextLine;
this.showText = showText;
}
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
textMoveNextLine.invoke(processor, null, new ArrayList<PdfObject>(0));
showText.invoke(processor, null, operands);
}
}
/**
* A content operator implementation (Tj).
*/
private static class ShowText implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfString string = (PdfString)operands.get(0);
processor.displayPdfString(string);
}
}
/**
* A content operator implementation (T*).
*/
private static class TextMoveNextLine implements ContentOperator{
private final TextMoveStartNextLine moveStartNextLine;
public TextMoveNextLine(TextMoveStartNextLine moveStartNextLine){
this.moveStartNextLine = moveStartNextLine;
}
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
ArrayList<PdfObject> tdoperands = new ArrayList<PdfObject>(2);
tdoperands.add(0, new PdfNumber(0));
tdoperands.add(1, new PdfNumber(-processor.gs().leading));
moveStartNextLine.invoke(processor, null, tdoperands);
}
}
/**
* A content operator implementation (Tm).
*/
private static class TextSetTextMatrix implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
float a = ((PdfNumber)operands.get(0)).floatValue();
float b = ((PdfNumber)operands.get(1)).floatValue();
float c = ((PdfNumber)operands.get(2)).floatValue();
float d = ((PdfNumber)operands.get(3)).floatValue();
float e = ((PdfNumber)operands.get(4)).floatValue();
float f = ((PdfNumber)operands.get(5)).floatValue();
processor.textLineMatrix = new Matrix(a, b, c, d, e, f);
processor.textMatrix = processor.textLineMatrix;
}
}
/**
* A content operator implementation (TD).
*/
private static class TextMoveStartNextLineWithLeading implements ContentOperator{
private final TextMoveStartNextLine moveStartNextLine;
private final SetTextLeading setTextLeading;
public TextMoveStartNextLineWithLeading(TextMoveStartNextLine moveStartNextLine, SetTextLeading setTextLeading){
this.moveStartNextLine = moveStartNextLine;
this.setTextLeading = setTextLeading;
}
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
float ty = ((PdfNumber)operands.get(1)).floatValue();
ArrayList<PdfObject> tlOperands = new ArrayList<PdfObject>(1);
tlOperands.add(0, new PdfNumber(-ty));
setTextLeading.invoke(processor, null, tlOperands);
moveStartNextLine.invoke(processor, null, operands);
}
}
/**
* A content operator implementation (Td).
*/
private static class TextMoveStartNextLine implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
float tx = ((PdfNumber)operands.get(0)).floatValue();
float ty = ((PdfNumber)operands.get(1)).floatValue();
Matrix translationMatrix = new Matrix(tx, ty);
processor.textMatrix = translationMatrix.multiply(processor.textLineMatrix);
processor.textLineMatrix = processor.textMatrix;
}
}
/**
* A content operator implementation (Tf).
*/
private static class SetTextFont implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfName fontResourceName = (PdfName)operands.get(0);
float size = ((PdfNumber)operands.get(1)).floatValue();
PdfDictionary fontsDictionary = processor.resources.getAsDict(PdfName.FONT);
CMapAwareDocumentFont font = processor.getFont((PRIndirectReference)fontsDictionary.get(fontResourceName));
processor.gs().font = font;
processor.gs().fontSize = size;
}
}
/**
* A content operator implementation (Tr).
*/
private static class SetTextRenderMode implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber render = (PdfNumber)operands.get(0);
processor.gs().renderMode = render.intValue();
}
}
/**
* A content operator implementation (Ts).
*/
private static class SetTextRise implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber rise = (PdfNumber)operands.get(0);
processor.gs().rise = rise.floatValue();
}
}
/**
* A content operator implementation (TL).
*/
private static class SetTextLeading implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber leading = (PdfNumber)operands.get(0);
processor.gs().leading = leading.floatValue();
}
}
/**
* A content operator implementation (Tz).
*/
private static class SetTextHorizontalScaling implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber scale = (PdfNumber)operands.get(0);
processor.gs().horizontalScaling = scale.floatValue()/100f;
}
}
/**
* A content operator implementation (Tc).
*/
private static class SetTextCharacterSpacing implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber charSpace = (PdfNumber)operands.get(0);
processor.gs().characterSpacing = charSpace.floatValue();
}
}
/**
* A content operator implementation (Tw).
*/
private static class SetTextWordSpacing implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfNumber wordSpace = (PdfNumber)operands.get(0);
processor.gs().wordSpacing = wordSpace.floatValue();
}
}
/**
* A content operator implementation (gs).
*/
private static class ProcessGraphicsStateResource implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
PdfName dictionaryName = (PdfName)operands.get(0);
PdfDictionary extGState = processor.resources.getAsDict(PdfName.EXTGSTATE);
if (extGState == null)
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("resources.do.not.contain.extgstate.entry.unable.to.process.operator.1", operator));
PdfDictionary gsDic = extGState.getAsDict(dictionaryName);
if (gsDic == null)
throw new IllegalArgumentException(MessageLocalization.getComposedMessage("1.is.an.unknown.graphics.state.dictionary", dictionaryName));
// at this point, all we care about is the FONT entry in the GS dictionary
PdfArray fontParameter = gsDic.getAsArray(PdfName.FONT);
if (fontParameter != null){
CMapAwareDocumentFont font = processor.getFont((PRIndirectReference)fontParameter.getPdfObject(0));
float size = fontParameter.getAsNumber(1).floatValue();
processor.gs().font = font;
processor.gs().fontSize = size;
}
}
}
/**
* A content operator implementation (q).
*/
private static class PushGraphicsState implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
GraphicsState gs = processor.gsStack.peek();
GraphicsState copy = new GraphicsState(gs);
processor.gsStack.push(copy);
}
}
/**
* A content operator implementation (cm).
*/
private static class ModifyCurrentTransformationMatrix implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
float a = ((PdfNumber)operands.get(0)).floatValue();
float b = ((PdfNumber)operands.get(1)).floatValue();
float c = ((PdfNumber)operands.get(2)).floatValue();
float d = ((PdfNumber)operands.get(3)).floatValue();
float e = ((PdfNumber)operands.get(4)).floatValue();
float f = ((PdfNumber)operands.get(5)).floatValue();
Matrix matrix = new Matrix(a, b, c, d, e, f);
GraphicsState gs = processor.gsStack.peek();
gs.ctm = matrix.multiply(gs.ctm);
}
}
/**
* A content operator implementation (Q).
*/
private static class PopGraphicsState implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
processor.gsStack.pop();
}
}
/**
* A content operator implementation (BT).
*/
private static class BeginText implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
processor.textMatrix = new Matrix();
processor.textLineMatrix = processor.textMatrix;
processor.beginText();
}
}
/**
* A content operator implementation (ET).
*/
private static class EndText implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) {
processor.textMatrix = null;
processor.textLineMatrix = null;
processor.endText();
}
}
/**
* A content operator implementation (BMC).
* @since 5.0.2
*/
private static class BeginMarkedContent implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor,
PdfLiteral operator, ArrayList<PdfObject> operands)
throws Exception {
processor.beginMarkedContent((PdfName)operands.get(0), new PdfDictionary());
}
}
/**
* A content operator implementation (BDC).
* @since 5.0.2
*/
private static class BeginMarkedContentDictionary implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor,
PdfLiteral operator, ArrayList<PdfObject> operands)
throws Exception {
PdfObject properties = operands.get(1);
processor.beginMarkedContent((PdfName)operands.get(0), getPropertiesDictionary(properties, processor.resources));
}
private PdfDictionary getPropertiesDictionary(PdfObject operand1, ResourceDictionary resources){
if (operand1.isDictionary())
return (PdfDictionary)operand1;
PdfName dictionaryName = ((PdfName)operand1);
return resources.getAsDict(dictionaryName);
}
}
/**
* A content operator implementation (BMC).
* @since 5.0.2
*/
private static class EndMarkedContent implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor,
PdfLiteral operator, ArrayList<PdfObject> operands)
throws Exception {
processor.endMarkedContent();
}
}
/**
* A content operator implementation (Do).
*/
private static class Do implements ContentOperator{
public void invoke(PdfContentStreamProcessor processor, PdfLiteral operator, ArrayList<PdfObject> operands) throws IOException {
PdfName xobjectName = (PdfName)operands.get(0);
processor.displayXObject(xobjectName);
}
}
/**
* An XObject subtype handler for FORM
*/
private static class FormXObjectDoHandler implements XObjectDoHandler{
public void handleXObject(PdfContentStreamProcessor processor, PdfStream stream, PdfIndirectReference ref) {
final PdfDictionary resources = stream.getAsDict(PdfName.RESOURCES);
// we read the content bytes up here so if it fails we don't leave the graphics state stack corrupted
// this is probably not necessary (if we fail on this, probably the entire content stream processing
// operation should be rejected
byte[] contentBytes;
try {
contentBytes = ContentByteUtils.getContentBytesFromContentObject(stream);
} catch (IOException e1) {
throw new ExceptionConverter(e1);
}
final PdfArray matrix = stream.getAsArray(PdfName.MATRIX);
new PushGraphicsState().invoke(processor, null, null);
if (matrix != null){
float a = matrix.getAsNumber(0).floatValue();
float b = matrix.getAsNumber(1).floatValue();
float c = matrix.getAsNumber(2).floatValue();
float d = matrix.getAsNumber(3).floatValue();
float e = matrix.getAsNumber(4).floatValue();
float f = matrix.getAsNumber(5).floatValue();
Matrix formMatrix = new Matrix(a, b, c, d, e, f);
processor.gs().ctm = formMatrix.multiply(processor.gs().ctm);
}
processor.processContent(contentBytes, resources);
new PopGraphicsState().invoke(processor, null, null);
}
}
/**
* An XObject subtype handler for IMAGE
*/
private static class ImageXObjectDoHandler implements XObjectDoHandler{
public void handleXObject(PdfContentStreamProcessor processor, PdfStream xobjectStream, PdfIndirectReference ref) {
ImageRenderInfo renderInfo = ImageRenderInfo.createForXObject(processor.gs().ctm, ref);
processor.renderListener.renderImage(renderInfo);
}
}
/**
* An XObject subtype handler that does nothing
*/
private static class IgnoreXObjectDoHandler implements XObjectDoHandler{
public void handleXObject(PdfContentStreamProcessor processor, PdfStream xobjectStream, PdfIndirectReference ref) {
// ignore XObject subtype
}
}
}
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