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Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin
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/*
 * ===========================================
 * 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
 *
 @LICENSE@
 *
 * ---------------
 * XForm.java
 * ---------------
 */
package org.jpedal.parser.image;

import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;

import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.render.DynamicVectorRenderer;
import org.jpedal.utils.Matrix;

/**
 *
 */
public class XForm {

    private static boolean hasEmptySMask(final GraphicsState gs) {
        return gs.SMask != null && gs.SMask.getGeneralType(PdfDictionary.SMask) == PdfDictionary.None;
    }

    public static PdfObject getSMask(final float[] BBox, final GraphicsState gs, final PdfObjectReader currentPdfFile) {
        PdfObject newSMask = null;

        //ignore if none
        if (hasEmptySMask(gs)) {

            return null;
        }

        if (gs.SMask != null && BBox != null) { //see if SMask to cache to image & stop negative cases such as Milkshake StckBook Activity disX.pdf

            //if(gs.SMask.getParameterConstant(PdfDictionary.Type)!=PdfDictionary.Mask || gs.SMask.getFloatArray(PdfDictionary.BC)!=null){ //fix for waves file
            newSMask = gs.SMask.getDictionary(PdfDictionary.G);
            currentPdfFile.checkResolved(newSMask);

            // }
        }
        return newSMask;
    }

    private static final float[] matches = {1f, 0f, 0f, 1f, 0f, 0f};

    public static boolean isIdentity(final float[] matrix) {

        boolean isIdentity = true; // assume right and try to disprove

        if (matrix != null) {

            //see if it matches if not set flag and exit
            for (int ii = 0; ii < 6; ii++) {
                if (matrix[ii] != matches[ii]) {
                    isIdentity = false;
                    break;
                }
            }
        }

        return isIdentity;
    }


    public static Area setClip(final Shape defaultClip, final float[] BBox, final GraphicsState gs, final DynamicVectorRenderer current) {

        final Rectangle rect = new Rectangle();
        rect.setFrameFromDiagonal(BBox[0], BBox[1], BBox[2], BBox[3]);

        final float minX = (float) rect.getMinX();
        final float minY = (float) rect.getMinY();

        final float maxX = (float) rect.getMaxX();
        final float maxY = (float) rect.getMaxY();

        final float[] p1 = Matrix.transformPoint(gs.CTM, minX, minY);
        final float[] p2 = Matrix.transformPoint(gs.CTM, maxX, minY);
        final float[] p3 = Matrix.transformPoint(gs.CTM, maxX, maxY);
        final float[] p4 = Matrix.transformPoint(gs.CTM, minX, maxY);

        final GeneralPath gp = new GeneralPath();
        gp.moveTo(p1[0], p1[1]);
        gp.lineTo(p2[0], p2[1]);
        gp.lineTo(p3[0], p3[1]);
        gp.lineTo(p4[0], p4[1]);
        gp.closePath();

        final Area clip;

        if (gs.getClippingShape() == null) {
            clip = null;
        } else {
            clip = (Area) gs.getClippingShape().clone();
        }

        gs.updateClip(new Area(gp));
        current.drawClip(gs, defaultClip, false);

        return clip;
    }

}