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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
*
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
*
* ---------------
* AxialShadeContext.java
* ---------------
*/
package com.idrsolutions.pdf.color.shading;
import java.awt.Color;
import java.awt.PaintContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.function.PDFFunction;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.utils.Matrix;
/**
* @author suda
*/
public class AxialShadeContext implements PaintContext {
private final GenericColorSpace shadingColorSpace;
private final PDFFunction[] function;
private final float[] background;
private float[] domain = {0.0f, 1.0f};
private boolean[] extension;
final float t0, t1, x0, y0, x1, y1, deltaX, deltaY, multiXY;
private Rectangle2D bboxRect;
private final float[][] toUserSpace;
private final float[][] toShadeSpace;
public AxialShadeContext(final AffineTransform xform, final GenericColorSpace shadingColorSpace, final float[] background, final PdfObject shadingObject, final float[][] mm, final PDFFunction[] function) {
this.shadingColorSpace = shadingColorSpace;
this.function = function;
final float[] newDomain = shadingObject.getFloatArray(PdfDictionary.Domain);
if (newDomain != null) {
domain = newDomain;
}
this.background = background;
extension = shadingObject.getBooleanArray(PdfDictionary.Extend);
if (extension == null) {
extension = new boolean[]{false, false};
}
t0 = domain[0];
t1 = domain[1];
float[] bbox = shadingObject.getFloatArray(PdfDictionary.BBox);
if (bbox != null) {
GeneralPath gp = new GeneralPath();
gp.moveTo(bbox[0], bbox[1]);
gp.lineTo(bbox[2], bbox[1]);
gp.lineTo(bbox[2], bbox[3]);
gp.lineTo(bbox[0], bbox[3]);
gp.lineTo(bbox[0], bbox[1]);
gp.closePath();
bboxRect = gp.getBounds2D();
}
float[][] caller = {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}};
float[][] shadeMatrix = {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}};
if (mm != null) {
caller = mm;
}
final float[] inputs = shadingObject.getFloatArray(PdfDictionary.Matrix);
if (inputs != null) {
shadeMatrix = new float[][]{{inputs[0], inputs[1], 0}, {inputs[2], inputs[3], 0}, {inputs[4], inputs[5], 1}};
}
final float[][] shader = Matrix.concatenate(caller, shadeMatrix);
final float[][] xformMatrix = {
{(float) xform.getScaleX(), (float) xform.getShearX(), 0},
{(float) xform.getShearY(), (float) xform.getScaleY(), 0},
{(float) xform.getTranslateX(), (float) xform.getTranslateY(), 1}
};
toUserSpace = Matrix.inverse(xformMatrix);
toShadeSpace = Matrix.inverse(shader);
final float[] coords = shadingObject.getFloatArray(PdfDictionary.Coords);
x0 = coords[0];
y0 = coords[1];
x1 = coords[2];
y1 = coords[3];
deltaX = (x1 - x0);
deltaY = (y1 - y0);
multiXY = deltaX * deltaX + deltaY * deltaY;
}
@Override
public void dispose() {
}
@Override
public ColorModel getColorModel() {
return ColorModel.getRGBdefault();
}
@Override
public Raster getRaster(final int startX, final int startY, final int w, final int h) {
final int rastSize = (w * h * 4);
final int[] data = new int[rastSize];
if (background != null) {
shadingColorSpace.setColor(background, 4);
final Color c = (Color) shadingColorSpace.getColor();
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
final int base = (i * w + j) * 4;
data[base] = c.getRed();
data[base + 1] = c.getGreen();
data[base + 2] = c.getBlue();
data[base + 3] = 255;
}
}
}
float x, y, xp;
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
boolean render = true;
float[] src = {startX + j, startY + i};
src = Matrix.transformPoint(toUserSpace, src[0], src[1]);
src = Matrix.transformPoint(toShadeSpace, src[0], src[1]);
x = src[0];
y = src[1];
float t = 0;
xp = (deltaX * (x - x0) + deltaY * (y - y0)) / multiXY;
if (xp >= 0 && xp <= 1) {
t = t0 + (t1 - t0) * xp;
} else if (xp < 0 && extension[0]) {
t = t0;
} else if (xp > 1 && extension[1]) {
t = t1;
} else {
render = false;
}
if (bboxRect != null && render) {
render = bboxRect.contains(x, y);
}
if (render) {
final Color c = calculateColor(t);
final int base = (i * w + j) * 4;
data[base] = c.getRed();
data[base + 1] = c.getGreen();
data[base + 2] = c.getBlue();
data[base + 3] = 255;
}
}
}
final WritableRaster raster = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB).getRaster();
raster.setPixels(0, 0, w, h, data);
return raster;
}
private Color calculateColor(final float val) {
final Color col;
final float[] colValues = ShadingFactory.applyFunctions(function, new float[]{val});
shadingColorSpace.setColor(colValues, colValues.length);
col = (Color) shadingColorSpace.getColor();
return col;
}
}
