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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
*
* ---------------
* MaskUtils.java
* ---------------
*/
package org.jpedal.parser.image.mask;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Area;
import java.awt.image.BufferedImage;
import org.jpedal.color.PdfPaint;
import org.jpedal.exception.PdfException;
import org.jpedal.function.FunctionFactory;
import org.jpedal.function.PDFFunction;
import org.jpedal.io.ObjectStore;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.FunctionObject;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.parser.ParserOptions;
import org.jpedal.parser.PdfStreamDecoder;
import org.jpedal.parser.ValueTypes;
import org.jpedal.parser.image.PDFObjectToImage;
import org.jpedal.render.DynamicVectorRenderer;
import org.jpedal.render.SwingDisplay;
import org.jpedal.utils.LogWriter;
public class MaskUtils {
/**
* @param XObject
* @param name
* @param newSMask
* @param gs
* @param current
* @param currentPdfFile
* @param parserOptions
* @param formLevel
* @param multiplyer
* @param useTransparancy
* @throws PdfException
*/
public static void createMaskForm(final PdfObject XObject, final String name, final PdfObject newSMask, final GraphicsState gs,
final DynamicVectorRenderer current, final PdfObjectReader currentPdfFile,
final ParserOptions parserOptions, final int formLevel, final float multiplyer, final boolean useTransparancy, final int blendMode) {
final float[] BBox = XObject.getFloatArray(PdfDictionary.BBox);
//System.out.println("x,y="+gs.CTM[2][0]+" "+gs.CTM[2][1]+" "+BBox[0]+" "+BBox[1]+" "+BBox[2]+" "+BBox[3]+" "+newSMask);
/*get form as an image*/
int fx = (int) BBox[0];
int fw = (int) BBox[2];
int fy = (int) BBox[1];
int fh = (int) BBox[3];
if (fw == 32768 || fh == 32768) { //means we should ignore bbox
fx = 0;
fy = 0;
fw = 1;
fh = 1;
}
final int iw, ih;
float scaling = 4f;
if (fw * fh >= 25000000) {
scaling = 1f;
}
BufferedImage image = PDFObjectToImage.getImageFromPdfObject(XObject, fx, fw, fy, fh, currentPdfFile, parserOptions, formLevel, multiplyer, (newSMask == null && useTransparancy), scaling);
if (newSMask != null) { //apply SMask to image
final BufferedImage smaskImage = PDFObjectToImage.getImageFromPdfObject(newSMask, fx, fw, fy, fh, currentPdfFile, parserOptions, formLevel, multiplyer, false, scaling);
int[] tr = null;
final PdfObject objTR = gs.SMask.getDictionary(PdfDictionary.TR);
//smask may contain tr values refer to case 25259
if (objTR != null) {
final PdfObject funcObj = new FunctionObject(objTR.getObjectRefAsString());
currentPdfFile.readObject(funcObj);
final PDFFunction function = FunctionFactory.getFunction(funcObj, currentPdfFile);
if (function != null) {
tr = new int[256];
for (int i = 0; i < 256; i++) {
tr[i] = (int) (function.compute(new float[]{i / 255f})[0] * 255);
}
}
}
if (gs.SMask.getNameAsConstant(PdfDictionary.S) == PdfDictionary.Luminosity) {
final float[] bcFloats = gs.SMask.getFloatArray(PdfDictionary.BC);
if (bcFloats != null) {
final PdfPaint prev = gs.nonstrokeColorSpace.getColor();
gs.nonstrokeColorSpace.setColor(bcFloats, bcFloats.length);
final int bc = gs.nonstrokeColorSpace.getColor().getRGB();
gs.nonstrokeColorSpace.setColor(prev);
image = SMask.applyLuminosityMask(image, smaskImage, tr, true, bc);
} else {
image = SMask.applyLuminosityMask(image, smaskImage, tr, false, 0);
}
} else {
image = SMask.applyAlphaMask(image, smaskImage);
}
if (smaskImage != null) {
smaskImage.flush();
}
}
iw = (int) (image.getWidth() / scaling);
ih = (int) (image.getHeight() / scaling);
final GraphicsState gs1; //add in gs
boolean isChanged = false;
if (newSMask == null && gs.getAlphaMax(GraphicsState.FILL) < 1f) {
isChanged = true;
gs1 = new GraphicsState(); //add in gs
gs1.setMaxAlpha(GraphicsState.FILL, gs.getAlphaMax(GraphicsState.FILL));
gs1.setMaxAlpha(GraphicsState.STROKE, gs.getAlphaMax(GraphicsState.STROKE));
current.setGraphicsState(GraphicsState.STROKE, gs.getAlpha(GraphicsState.STROKE), PdfDictionary.Normal);
current.setGraphicsState(GraphicsState.FILL, gs.getAlpha(GraphicsState.FILL), blendMode); //look at transparency design guide in pdf
} else {
if (formLevel == 1) {
gs1 = new GraphicsState(gs); //add in gs
} else {
gs1 = new GraphicsState(); //add in gs
}
}
final int prevBM = gs1.getBMValue();
if (formLevel == 1) { //dont blend if it is not formlevel 1
gs1.setBMValue(blendMode);
}
gs1.CTM = new float[][]{{iw, 0, 1}, {0, ih, 1}, {0, 0, 0}};
//different formula needed if flattening forms
if (parserOptions.isFlattenedForm()) {
gs1.x = parserOptions.getflattenX();
gs1.y = parserOptions.getflattenY();
} else {
gs1.x = fx;
if (fy < fh) {
gs1.y = fy;
} else {
gs1.y = fy - ih;
}
}
//see case 20638 for this quick fix we can use affine transform in future
gs1.CTM[2][0] = (gs1.x * gs.CTM[0][0]) + gs.CTM[2][0];
gs1.CTM[2][1] = (gs1.y * gs.CTM[1][1]) + gs.CTM[2][1];
//factor in any scaling and invert
gs1.CTM[0][0] *= gs.CTM[0][0];
gs1.CTM[1][1] = -gs1.CTM[1][1] * gs.CTM[1][1];
gs1.CTM[2][1] -= gs1.CTM[1][1];
//separate call needed to paint image on thumbnail or background image in HTML/SVG
if (current.isHTMLorSVG()) {
/*
* explicitly need clip passed through
*/
final Area clip = gs.getClippingShape();
if (clip != null) {
gs1.updateClip(clip);
}
//we always use high res for these in html to give best quality results
//final boolean currentHiResSetting = current.getHiResImageForDisplayMode();
//current.setHiResImageForDisplayMode(true);
current.drawImage(parserOptions.getPageNumber(), image, gs1, false, name, -2);
//restore default
//current.setHiResImageForDisplayMode(currentHiResSetting);
} else {
gs1.x = gs1.CTM[2][0];
gs1.y = gs1.CTM[2][1];
current.drawImage(parserOptions.getPageNumber(), image, gs1, false, name, -1);
}
gs1.setBMValue(prevBM);
if (isChanged) {
current.setGraphicsState(GraphicsState.STROKE, gs.getAlpha(GraphicsState.STROKE), gs.getBMValue());
current.setGraphicsState(GraphicsState.FILL, gs.getAlpha(GraphicsState.FILL), gs.getBMValue());
}
}
public static BufferedImage createTransparentForm(final PdfObject XObject, final int fy, final int fw, final int fh,
final PdfObjectReader currentPdfFile, final ParserOptions parserOptions, final int formLevel, final float multiplyer) {
final BufferedImage image;
final byte[] objectData1 = currentPdfFile.readStream(XObject, true, true, false, false, false, XObject.getCacheName(currentPdfFile.getObjectReader()));
final ObjectStore localStore = new ObjectStore();
final DynamicVectorRenderer glyphDisplay = new SwingDisplay(0, false, 20, localStore);
final PdfStreamDecoder glyphDecoder = new PdfStreamDecoder(currentPdfFile);
glyphDecoder.setParameters(true, true, 3, 65, false, parserOptions.useJavaFX());
glyphDecoder.setObjectValue(ValueTypes.ObjectStore, localStore);
// glyphDecoder.setObjectValue(Options.ErrorTracker, errorTracker);
glyphDecoder.setFormLevel(formLevel);
glyphDecoder.setMultiplyer(multiplyer);
// glyphDecoder.setFloatValue(SamplingUsed, samplingUsed);
glyphDecoder.setRenderer(glyphDisplay);
/*read any resources*/
try {
final PdfObject SMaskResources = XObject.getDictionary(PdfDictionary.Resources);
if (SMaskResources != null) {
glyphDecoder.readResources(SMaskResources, false);
}
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
/*decode the stream*/
if (objectData1 != null) {
glyphDecoder.decodeStreamIntoObjects(objectData1, false);
}
int hh = fh;
//float diff=fy;
if (fy > fh) {
hh = fy - fh;
// diff=fh;
}
//as we make it image, make it bigger to retain quality
final int scaling = 4;
//get bit underneath and merge in
image = new BufferedImage(scaling * fw, scaling * hh, BufferedImage.TYPE_INT_ARGB);
final Graphics2D formG2 = image.createGraphics();
formG2.setColor(Color.WHITE);
formG2.fillRect(0, 0, scaling * fw, scaling * hh);
formG2.translate(0, scaling * hh);
formG2.scale(1, -1);
formG2.scale(scaling, scaling);
//current.paint(formG2,null,null,null,false,true);
glyphDisplay.setG2(formG2);
glyphDisplay.paint(null, null, null);
localStore.flush();
return image;
}
}
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