com.twelvemonkeys.imageio.path.AdobePathBuilder Maven / Gradle / Ivy
/*
* Copyright (c) 2014, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name "TwelveMonkeys" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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package com.twelvemonkeys.imageio.path;
import com.twelvemonkeys.imageio.stream.ByteArrayImageInputStream;
import javax.imageio.IIOException;
import java.awt.geom.GeneralPath;
import java.awt.geom.Path2D;
import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static com.twelvemonkeys.lang.Validate.isTrue;
import static com.twelvemonkeys.lang.Validate.notNull;
/**
* Creates a {@code Shape} object from an Adobe Photoshop Path resource.
*
* @see Adobe Photoshop Path resource format
* @author Jason Palmer, itemMaster LLC
* @author Harald Kuhr
*/
public final class AdobePathBuilder {
final static boolean DEBUG = "true".equalsIgnoreCase(System.getProperty("com.twelvemonkeys.imageio.path.debug"));
private final DataInput data;
/**
* Creates a path builder that will read its data from a {@code DataInput}, such as an
* {@code ImageInputStream}.
* The data length is assumed to be a multiple of 26.
*
* @param data the input to read data from.
* @throws java.lang.IllegalArgumentException if {@code data} is {@code null}
*/
public AdobePathBuilder(final DataInput data) {
notNull(data, "data");
this.data = data;
}
/**
* Creates a path builder that will read its data from a {@code byte} array.
* The array length must be a multiple of 26, and greater than 0.
*
* @param data the array to read data from.
* @throws java.lang.IllegalArgumentException if {@code data} is {@code null}, or not a multiple of 26.
*/
public AdobePathBuilder(final byte[] data) {
this(new ByteArrayImageInputStream(
notNull(data, "data"), 0,
isTrue(data.length > 0 && data.length % 26 == 0, data.length, "data.length must be a multiple of 26: %d")
));
}
/**
* Builds the path.
*
* @return the path
* @throws javax.imageio.IIOException if the input contains a bad path data.
* @throws IOException if a general I/O exception occurs during reading.
*/
public Path2D path() throws IOException {
List> subPaths = new ArrayList>();
List currentPath = null;
int currentPathLength = 0;
AdobePathSegment segment;
while ((segment = nextSegment()) != null) {
if (DEBUG) {
System.out.println(segment);
}
if (segment.selector == AdobePathSegment.OPEN_SUBPATH_LENGTH_RECORD || segment.selector == AdobePathSegment.CLOSED_SUBPATH_LENGTH_RECORD) {
if (currentPath != null) {
if (currentPathLength != currentPath.size()) {
throw new IIOException(String.format("Bad path, expected %d segments, found only %d", currentPathLength, currentPath.size()));
}
subPaths.add(currentPath);
}
currentPath = new ArrayList(segment.length);
currentPathLength = segment.length;
}
else if (segment.selector == AdobePathSegment.OPEN_SUBPATH_BEZIER_LINKED
|| segment.selector == AdobePathSegment.OPEN_SUBPATH_BEZIER_UNLINKED
|| segment.selector == AdobePathSegment.CLOSED_SUBPATH_BEZIER_LINKED
|| segment.selector == AdobePathSegment.CLOSED_SUBPATH_BEZIER_UNLINKED) {
if (currentPath == null) {
throw new IIOException("Bad path, missing subpath length record");
}
if (currentPath.size() >= currentPathLength) {
throw new IIOException(String.format("Bad path, expected %d segments, found%d", currentPathLength, currentPath.size()));
}
currentPath.add(segment);
}
}
// now add the last one
if (currentPath != null) {
if (currentPathLength != currentPath.size()) {
throw new IIOException(String.format("Bad path, expected %d segments, found only %d", currentPathLength, currentPath.size()));
}
subPaths.add(currentPath);
}
// now we have collected the PathPoints now create a Shape.
return pathToShape(subPaths);
}
/**
* The Correct Order... P1, P2, P3, P4, P5, P6 (Closed) moveTo(P1)
* curveTo(P1.cpl, P2.cpp, P2.ap); curveTo(P2.cpl, P3.cppy, P3.ap);
* curveTo(P3.cpl, P4.cpp, P4.ap); curveTo(P4.cpl, P5.cpp, P5.ap);
* curveTo(P5.cply, P6.cpp, P6.ap); curveTo(P6.cpl, P1.cpp, P1.ap);
* closePath()
*/
private Path2D pathToShape(final List> paths) {
GeneralPath path = new GeneralPath(Path2D.WIND_EVEN_ODD, paths.size());
GeneralPath subpath = null;
for (List points : paths) {
int length = points.size();
for (int i = 0; i < points.size(); i++) {
AdobePathSegment current = points.get(i);
int step = i == 0 ? 0 : i == length - 1 ? 2 : 1;
switch (step) {
// begin
case 0: {
subpath = new GeneralPath(Path2D.WIND_EVEN_ODD, length);
subpath.moveTo(current.apx, current.apy);
if (length > 1) {
AdobePathSegment next = points.get((i + 1));
subpath.curveTo(current.cplx, current.cply, next.cppx, next.cppy, next.apx, next.apy);
}
else {
subpath.lineTo(current.apx, current.apy);
}
break;
}
// middle
case 1: {
AdobePathSegment next = points.get((i + 1)); // we are always guaranteed one more.
subpath.curveTo(current.cplx, current.cply, next.cppx, next.cppy, next.apx, next.apy);
break;
}
// end
case 2: {
AdobePathSegment first = points.get(0);
if (first.selector == AdobePathSegment.CLOSED_SUBPATH_BEZIER_LINKED || first.selector == AdobePathSegment.CLOSED_SUBPATH_BEZIER_UNLINKED) {
subpath.curveTo(current.cplx, current.cply, first.cppx, first.cppy, first.apx, first.apy);
subpath.closePath();
path.append(subpath, false);
}
else {
subpath.lineTo(current.apx, current.apy);
path.append(subpath, true);
}
break;
}
}
}
}
return path;
}
private AdobePathSegment nextSegment() throws IOException {
// Each segment is 26 bytes
int selector;
try {
selector = data.readUnsignedShort();
}
catch (EOFException eof) {
// No more data, we're done
return null;
}
// Spec says Fill rule is ignored by Photoshop... Probably not.. ;-)
// TODO: Replace with switch + handle all types!
// TODO: ...or Move logic to AdobePathSegment?
if (selector == AdobePathSegment.CLOSED_SUBPATH_LENGTH_RECORD || selector == AdobePathSegment.OPEN_SUBPATH_LENGTH_RECORD) {
int size = data.readUnsignedShort();
// data.position(data.position() + 22); // Skip remaining
data.skipBytes(22);
return new AdobePathSegment(selector, size);
}
return new AdobePathSegment(
selector,
readFixedPoint(data.readInt()),
readFixedPoint(data.readInt()),
readFixedPoint(data.readInt()),
readFixedPoint(data.readInt()),
readFixedPoint(data.readInt()),
readFixedPoint(data.readInt())
);
}
private static double readFixedPoint(final int fixed) {
return ((double) fixed / 0x1000000);
}
}
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