Main image processing is now in ImageViewer, used by both ViewImage and ViewFavicon. Fixed URIMetadataNode.getFavicon to use non-standard icons with no size ass fallback.pull/39/head
luc
9 years ago
parent
07222b3e1a
commit
26f1ead57c
@ -0,0 +1,198 @@
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// ViewFavicon.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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// created 03.04.2006
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Map;
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import javax.imageio.ImageIO;
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import javax.imageio.stream.ImageInputStream;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.document.id.MultiProtocolURL;
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import net.yacy.cora.protocol.Domains;
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import net.yacy.cora.protocol.HeaderFramework;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.storage.ConcurrentARC;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.kelondro.util.FileUtils;
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import net.yacy.kelondro.util.MemoryControl;
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import net.yacy.kelondro.workflow.WorkflowProcessor;
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import net.yacy.peers.graphics.EncodedImage;
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import net.yacy.search.Switchboard;
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import net.yacy.server.serverObjects;
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import net.yacy.server.serverSwitch;
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import net.yacy.visualization.ImageViewer;
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/**
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* Extends ViewImage behavior : add a specific favicon cache and use of a
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* default image on loading error.
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*
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* @author luc
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*
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*/
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public class ViewFavicon {
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/** Single instance of ImageViewer */
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private static final ImageViewer VIEWER = new ImageViewer();
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/** Icons cache encoded as png */
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private static Map<String, byte[]> pngIconCache = new ConcurrentARC<String, byte[]>(1000,
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Math.max(10, Math.min(32, WorkflowProcessor.availableCPU * 2)));
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/** Default icon local file */
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private static final String defaulticon = "htroot/env/grafics/dfltfvcn.ico";
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/**
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* Default icon encoded as png : we use a bvte array as it is thread-safe
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* instead of a ByteBuffer in EncodedImage
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*/
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private static byte[] defaultPNGEncodedIcon = null;
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/**
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* Try parsing image from post "url" parameter (authenticated users) or from
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* "code" parameter (non authenticated users). When image could be parsed,
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* try encoding to target format specified by header "EXT". When any error
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* occurs, return default icon.
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*
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* @param header
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* request header
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* @param post
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* post parameters
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* @param env
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* Switchboard instance
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* @return an {@link EncodedImage} instance encoded in format specified in
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* post, or an InputStream pointing to original image data.
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*/
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public static Object respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
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final Switchboard sb = (Switchboard) env;
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String ext = header.get("EXT", null);
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boolean isPNGTarget = "png".equalsIgnoreCase(ext);
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ImageInputStream imageInStream = null;
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InputStream inStream = null;
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byte[] resultBytes = null;
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try {
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/* Clear icon cache when running out of memory */
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if (MemoryControl.shortStatus()) {
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pngIconCache.clear();
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}
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final boolean auth = Domains.isLocalhost(header.get(HeaderFramework.CONNECTION_PROP_CLIENTIP, ""))
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|| sb.verifyAuthentication(header); // handle access rights
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DigestURL url = VIEWER.parseURL(post, auth);
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final String normalizedURL = url.toNormalform(false);
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if (isPNGTarget) {
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resultBytes = pngIconCache.get(normalizedURL);
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}
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/* Icon is not already in cache */
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if (resultBytes == null) {
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String urlExt = MultiProtocolURL.getFileExtension(url.getFileName());
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if (ext != null && ext.equalsIgnoreCase(urlExt) && ImageViewer.isBrowserRendered(urlExt)) {
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return VIEWER.openInputStream(post, sb.loader, auth, url);
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}
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/*
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* When opening a file, the most efficient is to open
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* ImageInputStream directly on file
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*/
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if (url.isFile()) {
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imageInStream = ImageIO.createImageInputStream(url.getFSFile());
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} else {
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inStream = VIEWER.openInputStream(post, sb.loader, auth, url);
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imageInStream = ImageIO.createImageInputStream(inStream);
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}
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// read image
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EncodedImage encodedIcon = VIEWER.parseAndScale(post, auth, url, ext, imageInStream);
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if (encodedIcon != null && !encodedIcon.getImage().isEmpty()) {
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resultBytes = encodedIcon.getImage().getBytes();
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if (isPNGTarget && encodedIcon.getImage().length() <= 10240) {
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/* Only store in cache icon images below 10KB, png encoded */
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pngIconCache.put(normalizedURL, resultBytes);
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}
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}
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}
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} catch (IOException e) {
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ConcurrentLog.fine("ViewFavicon", "Error loading favicon, default one wille be used : " + e);
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} finally {
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/*
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* imageInStream.close() method doesn't close source input stream
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*/
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if (inStream != null) {
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try {
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inStream.close();
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} catch (IOException ignored) {
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}
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}
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if (resultBytes == null) {
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/*
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* I any error occured when loading icon, return default one
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*/
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if (ext == null || isPNGTarget) {
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/* Load default icon only once */
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if (defaultPNGEncodedIcon == null) {
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defaultPNGEncodedIcon = loadDefaultIcon(post, sb, ext);
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}
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resultBytes = defaultPNGEncodedIcon;
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} else {
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resultBytes = loadDefaultIcon(post, sb, ext);
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}
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}
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}
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return new ByteArrayInputStream(resultBytes);
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}
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/**
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* Load default icon and encode it to ext format
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*
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* @param post
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* post parameters
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* @param sb
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* Switchboard instance
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* @param ext
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* target image format
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* @return icon encoded bytes, empty if and exception occured when loading
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* or rendering
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*/
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private static byte[] loadDefaultIcon(final serverObjects post, final Switchboard sb, String ext) {
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byte[] resultBytes;
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byte[] defaultBytes = new byte[0];
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try {
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defaultBytes = FileUtils.read(new File(sb.getAppPath(), defaulticon));
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} catch (final IOException initicon) {
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defaultBytes = new byte[0];
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} finally {
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resultBytes = new EncodedImage(defaultBytes, ext, post.getBoolean("isStatic")).getImage().getBytes();
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}
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return resultBytes;
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}
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}
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@ -0,0 +1,491 @@
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/**
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* ImageViewer
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* Copyright 2005 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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* First released 16.09.2005 at http://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.visualization;
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import java.awt.Container;
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import java.awt.Dimension;
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import java.awt.Graphics2D;
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import java.awt.Image;
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import java.awt.MediaTracker;
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import java.awt.Rectangle;
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import java.awt.image.BufferedImage;
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import java.awt.image.Raster;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.util.Iterator;
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import javax.imageio.ImageIO;
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import javax.imageio.ImageReader;
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import javax.imageio.stream.ImageInputStream;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.document.id.MultiProtocolURL;
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import net.yacy.cora.federate.yacy.CacheStrategy;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.data.InvalidURLLicenceException;
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import net.yacy.data.URLLicense;
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import net.yacy.http.servlets.TemplateMissingParameterException;
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import net.yacy.peers.graphics.EncodedImage;
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import net.yacy.repository.Blacklist.BlacklistType;
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import net.yacy.repository.LoaderDispatcher;
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import net.yacy.server.serverObjects;
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/**
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* Provides methods for image or favicon viewing in YaCy servlets.
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* @author luc
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*
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*/
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public class ImageViewer {
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/**
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* Try to get image URL from parameters.
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* @param post post parameters. Must not be null.
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* @param auth true when current user is authenticated
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* @return DigestURL instance
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* @throws MalformedURLException when url is malformed
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* @throws TemplateMissingParameterException when urlString or urlLicense is missing (the one needed depends on auth)
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*/
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public DigestURL parseURL(final serverObjects post, final boolean auth)
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throws MalformedURLException {
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final String urlString = post.get("url", "");
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final String urlLicense = post.get("code", "");
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DigestURL url;
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if(auth) {
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/* Authenticated user : rely on url parameter*/
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if (urlString.length() > 0) {
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url = new DigestURL(urlString);
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} else {
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throw new TemplateMissingParameterException("missing required url parameter");
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}
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} else {
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/* Non authenticated user : rely on urlLicense parameter */
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if((urlLicense.length() > 0)) {
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String licensedURL = URLLicense.releaseLicense(urlLicense);
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if (licensedURL != null) {
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url = new DigestURL(licensedURL);
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} else { // license is gone (e.g. released/remove in prev calls)
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ConcurrentLog.fine("ImageViewer", "image urlLicense not found key=" + urlLicense);
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/* Caller is responsible for handling this with appropriate HTTP status code */
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throw new InvalidURLLicenceException();
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}
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} else {
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throw new TemplateMissingParameterException("missing required code parameter");
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}
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}
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return url;
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}
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/**
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* Open input stream on image url using provided loader. All parameters must
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* not be null.
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*
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* @param post
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* post parameters.
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* @param loader.
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* Resources loader.
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* @param auth
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* true when user has credentials to load full images.
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* @param url
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* image url.
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* @return an open input stream instance (don't forget to close it).
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* @throws IOException
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* when a read/write error occured.
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*/
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public InputStream openInputStream(final serverObjects post, final LoaderDispatcher loader,
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final boolean auth, DigestURL url) throws IOException {
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InputStream inStream = null;
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if (url != null) {
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try {
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String agentName = post.get("agentName", auth ? ClientIdentification.yacyIntranetCrawlerAgentName
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: ClientIdentification.yacyInternetCrawlerAgentName);
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ClientIdentification.Agent agent = ClientIdentification.getAgent(agentName);
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inStream = loader.openInputStream(loader.request(url, false, true), CacheStrategy.IFEXIST,
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BlacklistType.SEARCH, agent);
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} catch (final IOException e) {
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/** No need to log full stack trace (in most cases resource is not available because of a network error) */
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ConcurrentLog.fine("ImageViewer", "cannot load image. URL : " + url.toNormalform(true));
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throw e;
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}
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}
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if (inStream == null) {
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throw new IOException("Input stream could no be open");
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}
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return inStream;
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}
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/**
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* @param formatName
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* informal file format name. For example : "png".
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* @return true when image format will be rendered by browser and not by a YaCy service
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*/
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public static boolean isBrowserRendered(String formatName) {
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/*
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* gif images are not loaded because of an animated gif bug within jvm
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* which sends java into an endless loop with high CPU
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*/
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/*
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* svg images not supported by jdk, but by most browser, deliver just
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* content (without crop/scale)
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*/
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return ("gif".equalsIgnoreCase(formatName) || "svg".equalsIgnoreCase(formatName));
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}
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/**
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* Process source image to try to produce an EncodedImage instance
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* eventually scaled and clipped depending on post parameters. When
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* processed, imageInStream is closed.
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*
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* @param post
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* request post parameters. Must not be null.
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* @param auth
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* true when access rigths are OK.
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* @param url
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* image source URL. Must not be null.
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* @param ext
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* target image file format. May be null.
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* @param imageInStream
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* open stream on image content. Must not be null.
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* @return an EncodedImage instance.
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* @throws IOException
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* when image could not be parsed or encoded to specified format.
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*/
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public EncodedImage parseAndScale(serverObjects post, boolean auth, DigestURL url, String ext,
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ImageInputStream imageInStream) throws IOException {
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EncodedImage encodedImage;
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// BufferedImage image = ImageIO.read(imageInStream);
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Iterator<ImageReader> readers = ImageIO.getImageReaders(imageInStream);
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if (!readers.hasNext()) {
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try {
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/* When no reader can be found, we have to close the stream */
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imageInStream.close();
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} catch (IOException ignoredException) {
|
||||||
|
}
|
||||||
|
String urlString = url.toNormalform(false);
|
||||||
|
String errorMessage = "Image format (" + MultiProtocolURL.getFileExtension(urlString) + ") is not supported.";
|
||||||
|
ConcurrentLog.fine("ImageViewer", errorMessage + "Image URL : " + urlString);
|
||||||
|
/*
|
||||||
|
* Throw an exception, wich will end in a HTTP 500 response, better
|
||||||
|
* handled by browsers than an empty image
|
||||||
|
*/
|
||||||
|
throw new IOException(errorMessage);
|
||||||
|
}
|
||||||
|
ImageReader reader = readers.next();
|
||||||
|
reader.setInput(imageInStream, true, true);
|
||||||
|
|
||||||
|
int maxwidth = post.getInt("maxwidth", 0);
|
||||||
|
int maxheight = post.getInt("maxheight", 0);
|
||||||
|
final boolean quadratic = post.containsKey("quadratic");
|
||||||
|
boolean isStatic = post.getBoolean("isStatic");
|
||||||
|
BufferedImage image = null;
|
||||||
|
boolean returnRaw = true;
|
||||||
|
if (!auth || maxwidth != 0 || maxheight != 0) {
|
||||||
|
|
||||||
|
// find original size
|
||||||
|
final int originWidth = reader.getWidth(0);
|
||||||
|
final int originHeigth = reader.getHeight(0);
|
||||||
|
|
||||||
|
// in case of not-authorized access shrink the image to
|
||||||
|
// prevent
|
||||||
|
// copyright problems, so that images are not larger than
|
||||||
|
// thumbnails
|
||||||
|
Dimension maxDimensions = calculateMaxDimensions(auth, originWidth, originHeigth, maxwidth, maxheight);
|
||||||
|
|
||||||
|
// if a quadratic flag is set, we cut the image out to be in
|
||||||
|
// quadratic shape
|
||||||
|
int w = originWidth;
|
||||||
|
int h = originHeigth;
|
||||||
|
if (quadratic && originWidth != originHeigth) {
|
||||||
|
Rectangle square = getMaxSquare(originHeigth, originWidth);
|
||||||
|
h = square.height;
|
||||||
|
w = square.width;
|
||||||
|
}
|
||||||
|
|
||||||
|
Dimension finalDimensions = calculateDimensions(w, h, maxDimensions);
|
||||||
|
|
||||||
|
if (originWidth != finalDimensions.width || originHeigth != finalDimensions.height) {
|
||||||
|
returnRaw = false;
|
||||||
|
image = readImage(reader);
|
||||||
|
if (quadratic && originWidth != originHeigth) {
|
||||||
|
image = makeSquare(image);
|
||||||
|
}
|
||||||
|
image = scale(finalDimensions.width, finalDimensions.height, image);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
/* Image do not need to be scaled or cropped */
|
||||||
|
if (returnRaw) {
|
||||||
|
if (!reader.getFormatName().equalsIgnoreCase(ext) || imageInStream.getFlushedPosition() != 0) {
|
||||||
|
/*
|
||||||
|
* image parsing and reencoding is only needed when source image
|
||||||
|
* and target formats differ, or when first bytes have been discarded
|
||||||
|
*/
|
||||||
|
returnRaw = false;
|
||||||
|
image = readImage(reader);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (returnRaw) {
|
||||||
|
byte[] imageData = readRawImage(imageInStream);
|
||||||
|
encodedImage = new EncodedImage(imageData, ext, isStatic);
|
||||||
|
} else {
|
||||||
|
/*
|
||||||
|
* An error can still occur when transcoding from buffered image to
|
||||||
|
* target ext : in that case EncodedImage.getImage() is empty.
|
||||||
|
*/
|
||||||
|
encodedImage = new EncodedImage(image, ext, isStatic);
|
||||||
|
if (encodedImage.getImage().length() == 0) {
|
||||||
|
String errorMessage = "Image could not be encoded to format : " + ext;
|
||||||
|
ConcurrentLog.fine("ImageViewer", errorMessage + ". Image URL : " + url.toNormalform(false));
|
||||||
|
throw new IOException(errorMessage);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return encodedImage;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Read image using specified reader and close ImageInputStream source.
|
||||||
|
* Input must have bean set before using
|
||||||
|
* {@link ImageReader#setInput(Object)}
|
||||||
|
*
|
||||||
|
* @param reader
|
||||||
|
* image reader. Must not be null.
|
||||||
|
* @return buffered image
|
||||||
|
* @throws IOException
|
||||||
|
* when an error occured
|
||||||
|
*/
|
||||||
|
private BufferedImage readImage(ImageReader reader) throws IOException {
|
||||||
|
BufferedImage image;
|
||||||
|
try {
|
||||||
|
image = reader.read(0);
|
||||||
|
} finally {
|
||||||
|
reader.dispose();
|
||||||
|
Object input = reader.getInput();
|
||||||
|
if (input instanceof ImageInputStream) {
|
||||||
|
try {
|
||||||
|
((ImageInputStream) input).close();
|
||||||
|
} catch (IOException ignoredException) {
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return image;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Read image data without parsing.
|
||||||
|
*
|
||||||
|
* @param inStream
|
||||||
|
* image source. Must not be null. First bytes must not have been marked discarded ({@link ImageInputStream#getFlushedPosition()} must be zero)
|
||||||
|
* @return image data as bytes
|
||||||
|
* @throws IOException
|
||||||
|
* when a read/write error occured.
|
||||||
|
*/
|
||||||
|
private byte[] readRawImage(ImageInputStream inStream) throws IOException {
|
||||||
|
byte[] buffer = new byte[4096];
|
||||||
|
int l = 0;
|
||||||
|
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
|
||||||
|
inStream.seek(0);
|
||||||
|
try {
|
||||||
|
while ((l = inStream.read(buffer)) >= 0) {
|
||||||
|
outStream.write(buffer, 0, l);
|
||||||
|
}
|
||||||
|
return outStream.toByteArray();
|
||||||
|
} finally {
|
||||||
|
try {
|
||||||
|
inStream.close();
|
||||||
|
} catch (IOException ignored) {
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Calculate image dimensions from image original dimensions, max
|
||||||
|
* dimensions, and target dimensions.
|
||||||
|
*
|
||||||
|
* @return dimensions to render image
|
||||||
|
*/
|
||||||
|
protected Dimension calculateDimensions(final int originWidth, final int originHeight, final Dimension max) {
|
||||||
|
int resultWidth;
|
||||||
|
int resultHeight;
|
||||||
|
if (max.width < originWidth || max.height < originHeight) {
|
||||||
|
// scale image
|
||||||
|
final double hs = (originWidth <= max.width) ? 1.0 : ((double) max.width) / ((double) originWidth);
|
||||||
|
final double vs = (originHeight <= max.height) ? 1.0 : ((double) max.height) / ((double) originHeight);
|
||||||
|
final double scale = Math.min(hs, vs);
|
||||||
|
// if (!auth) scale = Math.min(scale, 0.6); // this is for copyright
|
||||||
|
// purpose
|
||||||
|
if (scale < 1.0) {
|
||||||
|
resultWidth = Math.max(1, (int) (originWidth * scale));
|
||||||
|
resultHeight = Math.max(1, (int) (originHeight * scale));
|
||||||
|
} else {
|
||||||
|
resultWidth = Math.max(1, originWidth);
|
||||||
|
resultHeight = Math.max(1, originHeight);
|
||||||
|
}
|
||||||
|
|
||||||
|
} else {
|
||||||
|
// do not scale
|
||||||
|
resultWidth = originWidth;
|
||||||
|
resultHeight = originHeight;
|
||||||
|
}
|
||||||
|
return new Dimension(resultWidth, resultHeight);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Calculate image maximum dimentions from original and specified maximum
|
||||||
|
* dimensions
|
||||||
|
*
|
||||||
|
* @param auth
|
||||||
|
* true when acces rigths are OK.
|
||||||
|
* @return maximum dimensions to render image
|
||||||
|
*/
|
||||||
|
protected Dimension calculateMaxDimensions(final boolean auth, final int originWidth, final int originHeight,
|
||||||
|
final int maxWidth, final int maxHeight) {
|
||||||
|
int resultWidth;
|
||||||
|
int resultHeight;
|
||||||
|
// in case of not-authorized access shrink the image to prevent
|
||||||
|
// copyright problems, so that images are not larger than thumbnails
|
||||||
|
if (auth) {
|
||||||
|
resultWidth = (maxWidth == 0) ? originWidth : maxWidth;
|
||||||
|
resultHeight = (maxHeight == 0) ? originHeight : maxHeight;
|
||||||
|
} else if ((originWidth > 16) || (originHeight > 16)) {
|
||||||
|
resultWidth = Math.min(96, originWidth);
|
||||||
|
resultHeight = Math.min(96, originHeight);
|
||||||
|
} else {
|
||||||
|
resultWidth = 16;
|
||||||
|
resultHeight = 16;
|
||||||
|
}
|
||||||
|
return new Dimension(resultWidth, resultHeight);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Scale image to specified dimensions
|
||||||
|
*
|
||||||
|
* @param width
|
||||||
|
* target width
|
||||||
|
* @param height
|
||||||
|
* target height
|
||||||
|
* @param image
|
||||||
|
* image to scale. Must not be null.
|
||||||
|
* @return a scaled image
|
||||||
|
*/
|
||||||
|
public BufferedImage scale(final int width, final int height, final BufferedImage image) {
|
||||||
|
// compute scaled image
|
||||||
|
Image scaled = image.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING);
|
||||||
|
final MediaTracker mediaTracker = new MediaTracker(new Container());
|
||||||
|
mediaTracker.addImage(scaled, 0);
|
||||||
|
try {
|
||||||
|
mediaTracker.waitForID(0);
|
||||||
|
} catch (final InterruptedException e) {
|
||||||
|
}
|
||||||
|
|
||||||
|
// make a BufferedImage out of that
|
||||||
|
BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
|
||||||
|
try {
|
||||||
|
result.createGraphics().drawImage(scaled, 0, 0, width, height, null);
|
||||||
|
// check outcome
|
||||||
|
final Raster raster = result.getData();
|
||||||
|
int[] pixel = new int[raster.getSampleModel().getNumBands()];
|
||||||
|
pixel = raster.getPixel(0, 0, pixel);
|
||||||
|
} catch (final Exception e) {
|
||||||
|
/*
|
||||||
|
* Exception may be caused by source image color model : try now to
|
||||||
|
* convert to RGB before scaling
|
||||||
|
*/
|
||||||
|
try {
|
||||||
|
BufferedImage converted = EncodedImage.convertToRGB(image);
|
||||||
|
scaled = converted.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING);
|
||||||
|
mediaTracker.addImage(scaled, 1);
|
||||||
|
try {
|
||||||
|
mediaTracker.waitForID(1);
|
||||||
|
} catch (final InterruptedException e2) {
|
||||||
|
}
|
||||||
|
result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
|
||||||
|
result.createGraphics().drawImage(scaled, 0, 0, width, height, null);
|
||||||
|
|
||||||
|
// check outcome
|
||||||
|
final Raster raster = result.getData();
|
||||||
|
int[] pixel = new int[result.getSampleModel().getNumBands()];
|
||||||
|
pixel = raster.getPixel(0, 0, pixel);
|
||||||
|
} catch (Exception e2) {
|
||||||
|
result = image;
|
||||||
|
}
|
||||||
|
|
||||||
|
ConcurrentLog.fine("ImageViewer", "Image could not be scaled");
|
||||||
|
}
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
*
|
||||||
|
* @param h
|
||||||
|
* image height
|
||||||
|
* @param w
|
||||||
|
* image width
|
||||||
|
* @return max square area fitting inside dimensions
|
||||||
|
*/
|
||||||
|
public Rectangle getMaxSquare(final int h, final int w) {
|
||||||
|
Rectangle square;
|
||||||
|
if (w > h) {
|
||||||
|
final int offset = (w - h) / 2;
|
||||||
|
square = new Rectangle(offset, 0, h, h);
|
||||||
|
} else {
|
||||||
|
final int offset = (h - w) / 2;
|
||||||
|
square = new Rectangle(0, offset, w, w);
|
||||||
|
}
|
||||||
|
return square;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Crop image to make a square
|
||||||
|
*
|
||||||
|
* @param image
|
||||||
|
* image to crop
|
||||||
|
* @return
|
||||||
|
*/
|
||||||
|
public BufferedImage makeSquare(BufferedImage image) {
|
||||||
|
final int w = image.getWidth();
|
||||||
|
final int h = image.getHeight();
|
||||||
|
if (w > h) {
|
||||||
|
final BufferedImage dst = new BufferedImage(h, h, BufferedImage.TYPE_INT_ARGB);
|
||||||
|
Graphics2D g = dst.createGraphics();
|
||||||
|
final int offset = (w - h) / 2;
|
||||||
|
try {
|
||||||
|
g.drawImage(image, 0, 0, h - 1, h - 1, offset, 0, h + offset, h - 1, null);
|
||||||
|
} finally {
|
||||||
|
g.dispose();
|
||||||
|
}
|
||||||
|
image = dst;
|
||||||
|
} else {
|
||||||
|
final BufferedImage dst = new BufferedImage(w, w, BufferedImage.TYPE_INT_ARGB);
|
||||||
|
Graphics2D g = dst.createGraphics();
|
||||||
|
final int offset = (h - w) / 2;
|
||||||
|
try {
|
||||||
|
g.drawImage(image, 0, 0, w - 1, w - 1, 0, offset, w - 1, w + offset, null);
|
||||||
|
} finally {
|
||||||
|
g.dispose();
|
||||||
|
}
|
||||||
|
image = dst;
|
||||||
|
}
|
||||||
|
return image;
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Reference in new issue