/*
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Dateiverwaltung - File management in your browser
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Copyright (C) 2017 Ulrich Hilger, http://uhilger.de
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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 Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.uhilger.wbx;
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import java.awt.Graphics2D;
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import java.awt.Image;
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import java.awt.RenderingHints;
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import java.awt.image.BufferedImage;
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import java.awt.image.ConvolveOp;
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import java.awt.image.Kernel;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.FileNameMap;
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import java.net.URLConnection;
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import javax.imageio.ImageIO;
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/**
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* Methoden zur Verkleinerung von Bildern
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*/
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public class Bild {
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public static final int WINZIG = 0;
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public static final int KLEIN = 1;
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public static final int MITTEL = 2;
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public static final int GROSS = 3;
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public static final String[] GRNAME = {"-w", "-k", "-m", "-g"};
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public static final int[] GR = {120, 240, 700, 1200};
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public void writeImageStream(Image image, int gr, String mimeType, OutputStream out) throws InterruptedException, IOException {
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ImageIO.write(getReducedImage(image, gr, mimeType), imgType(mimeType), out);
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}
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/**
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*
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* @param image
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* @param gr
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* @param mimeType
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* @param vName Name der verkleinerten Datei
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* @throws InterruptedException
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* @throws IOException
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*/
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public void writeImageFile(Image image, int gr, String mimeType, String vName) throws InterruptedException, IOException {
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ImageIO.write(getReducedImage(image, gr, mimeType), imgType(mimeType), new File(vName));
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}
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private BufferedImage getReducedImage(Image image, int gr, String mimeType) throws InterruptedException, IOException {
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BufferedImage img;
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int q = 90;
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float sh = 0.f;
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if(mimeType.contains("jpeg")) {
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img = getReducedImage(image, gr, gr, q, sh, false);
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} else {
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img = getReducedImage(image, gr, gr, q, sh, true);
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}
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return img;
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}
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/**
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* Eine in Groesse und Qualitaet verringerte Bilddatei erzeugen
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* @param image Ablageort und Name der Bilddatei
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* @param width neue Breite
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* @param height neue hoehe
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* @param quality neue Qualitaet (0 - 100)
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* @param factor Faktor fuer Schaerfe / Unschaerfe (z.B. -0.15f fuer leichte Unschaerfe, 0.05f fuer leichtes Nachschaerfen)
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* @param withTransparency ob Transparenz benoetigt wird
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* @return neues, in Groesse und Qualitaet entsprechend verringertes Bild
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* @throws java.lang.InterruptedException
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* @throws java.io.FileNotFoundException
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*/
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public BufferedImage getReducedImage(Image image, int width, int height, int quality, float factor, boolean withTransparency)
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throws InterruptedException, FileNotFoundException, IOException {
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int imageWidth = image.getWidth(null);
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int imageHeight = image.getHeight(null);
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int thumbWidth = width;
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int thumbHeight = height;
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if(imageWidth < width) {
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thumbWidth = imageWidth;
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}
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if(imageHeight < height) {
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thumbHeight = imageHeight;
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}
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double thumbRatio = (double)thumbWidth / (double)thumbHeight;
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double imageRatio = (double)imageWidth / (double)imageHeight;
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if (thumbRatio < imageRatio) {
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thumbHeight = (int)(thumbWidth / imageRatio);
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}
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else {
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thumbWidth = (int)(thumbHeight * imageRatio);
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}
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// draw original image to thumbnail image object and
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// scale it to the new size on-the-fly
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//BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
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BufferedImage thumbImage;
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if(withTransparency) {
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thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_ARGB);
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} else {
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thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
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}
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Graphics2D graphics2D = thumbImage.createGraphics();
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graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
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// 30.7.2007: sharpening hinzugefuegt (Anfang)
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//float factor = -0.15f; // minus = sharpen, plus = soften
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//float[] sharpenArray = {0, -1, 0, -1, 5, -1, 0, -1, 0};
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/*
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30.6.2013: sharpening als Weichmacher nur, wenn Bild < 400
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*/
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/*if(thumbWidth < 400 || thumbHeight < 400) {
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factor = 0.1f;
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}*/
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if(factor != 0.f) {
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float[] array = {0, factor, 0, factor, 1-(factor*4), factor, 0, factor, 0};
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Kernel kernel = new Kernel(3, 3, array);
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ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
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thumbImage = cOp.filter(thumbImage, null);
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}
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// 30.7.2007: sharpening hinzugefuegt (Ende)
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return thumbImage;
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}
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public String imgType(String mimeType) {
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String imgType;
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if(mimeType.contains("jpg")) {
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imgType = "jpg";
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} else if(mimeType.contains("jpeg")) {
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imgType = "jpg";
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} else if(mimeType.contains("png")) {
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imgType = "png";
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} else if(mimeType.contains("gif")) {
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imgType = "gif";
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} else {
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imgType = "jpg";
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}
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return imgType;
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}
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/**
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*
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* @param v Bild.WINZIG .. Bild.GROSS
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* @return Länge der längsten Kante in Bildpunkten
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*/
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public int getVariantenGroesse(int v) {
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return GR[v];
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}
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public String getVariantenName(int v) {
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return GRNAME[v];
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}
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public String getMimeType(File file) {
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String absName = file.getAbsolutePath();
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FileNameMap fileNameMap = URLConnection.getFileNameMap();
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return fileNameMap.getContentTypeFor("file://" + absName);
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}
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}
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