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/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2017, Arnaud Roques
*
* Project Info: http://plantuml.com
*
* If you like this project or if you find it useful, you can support us at:
*
* http://plantuml.com/patreon (only 1$ per month!)
* http://plantuml.com/paypal
*
* This file is part of PlantUML.
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PlantUML 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
*
* Original Author: Zane D. Purvis
*
*
*/
package net.sourceforge.plantuml.swing;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
/**
* A collection of methods to help with processing images. A majority of this code was originally found online.
*/
public class ImageHelper {
/**
* Returns a scaled instance of a {@code BufferedImage}.
*
* Modified from: https://today.java.net/pub/a/today/2007/04/03/perils-of-image-getscaledinstance.html
*
* @param img
* the original image to be scaled
* @param targetDim
* the desired dimensions of the scaled instance, in pixels
* @param hint
* RenderingHints used when scaling the image
* @param higherQuality
* if true, this method will use a multi-step scaling technique that provides higher quality than the
* usual one-step technique (only useful in downscaling cases, targetDim is smaller than the original
* dimensions, and generally only when the {@code BILINEAR} hint is specified)
* @return a scaled version of the original {@code BufferedImage}
*/
public static BufferedImage getScaledInstance(BufferedImage img, Dimension targetDim, RenderingHints hints,
boolean higherQuality) {
final int targetWidth = targetDim.width;
final int targetHeight = targetDim.height;
final int type = (img.getTransparency() == Transparency.OPAQUE) ? BufferedImage.TYPE_INT_RGB
: BufferedImage.TYPE_INT_ARGB;
BufferedImage ret = (BufferedImage) img;
int w;
int h;
if (higherQuality) {
// Use multi-step technique: start with original size, then
// scale down in multiple passes with drawImage()
// until the target size is reached
w = img.getWidth();
h = img.getHeight();
} else {
// Use one-step technique: scale directly from original
// size to target size with a single drawImage() call
w = targetWidth;
h = targetHeight;
}
do {
if (higherQuality && w > targetWidth) {
w /= 2;
if (w < targetWidth) {
w = targetWidth;
}
}
if (higherQuality && h > targetHeight) {
h /= 2;
if (h < targetHeight) {
h = targetHeight;
}
}
final BufferedImage tmp = new BufferedImage(w, h, type);
final Graphics2D g2 = tmp.createGraphics();
g2.setRenderingHints(hints);
g2.drawImage(ret, 0, 0, w, h, null);
g2.dispose();
ret = tmp;
} while (w != targetWidth || h != targetHeight);
return ret;
}
/**
* Converts an Image to a BufferedImage.
*
* From: http://stackoverflow.com/questions/13605248/java-converting-image-to-bufferedimage
*/
public static BufferedImage toBufferedImage(Image img) {
if (img instanceof BufferedImage) {
return (BufferedImage) img;
}
// Create a buffered image with transparency
final BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null),
BufferedImage.TYPE_INT_ARGB);
// Draw the image on to the buffered image
final Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(img, 0, 0, null);
bGr.dispose();
return bimage;
}
/**
* Calculates the dimensions of a scaled image given the dimensions of an image and the area it is to be drawn in
* while preserving aspect ratio.
*
* From: http://stackoverflow.com/questions/10245220/java-image-resize-maintain-aspect-ratio
*
* @param imgSize
* dimensions of the original image.
* @param boundary
* dimensions of the area the image is to be drawn in.
*/
public static Dimension getScaledDimension(Dimension imgSize, Dimension boundary) {
final int originalWidth = imgSize.width;
final int originaHeight = imgSize.height;
final int boundWidth = boundary.width;
final int boundHeight = boundary.height;
int newWidth = originalWidth;
int newHeight = originaHeight;
// first check if we need to scale width
if (originalWidth > boundWidth) {
// scale width to fit
newWidth = boundWidth;
// scale height to maintain aspect ratio
newHeight = (newWidth * originaHeight) / originalWidth;
}
// then check if we need to scale even with the new height
if (newHeight > boundHeight) {
// scale height to fit instead
newHeight = boundHeight;
// scale width to maintain aspect ratio
newWidth = (newHeight * originalWidth) / originaHeight;
}
return new Dimension(newWidth, newHeight);
}
public static Dimension getScaledDimensionWidthFit(Dimension imgSize, Dimension boundary) {
final int originalWidth = imgSize.width;
final int originaHeight = imgSize.height;
final int boundWidth = boundary.width;
final int boundHeight = boundary.height;
int newWidth = originalWidth;
int newHeight = originaHeight;
// first check if we need to scale width
if (originalWidth != boundWidth) {
// scale width to fit
newWidth = boundWidth;
// scale height to maintain aspect ratio
newHeight = (newWidth * originaHeight) / originalWidth;
}
return new Dimension(newWidth, newHeight);
}
public static Dimension getScaledDimension(Dimension dim, double zoom) {
return new Dimension((int) (dim.getWidth() * zoom), (int) (dim.getHeight() * zoom));
}
}
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