| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| /** |
| * @test |
| * @bug 8080287 8136354 |
| * @run main RescaleAlphaTest |
| * @summary RescaleOp with scaleFactor/alpha should copy alpha to destination |
| * channel |
| */ |
| import java.awt.Graphics2D; |
| import java.awt.image.BufferedImage; |
| import java.awt.image.RescaleOp; |
| import java.awt.Color; |
| import java.awt.Frame; |
| import java.io.IOException; |
| |
| public class RescaleAlphaTest { |
| |
| BufferedImage bimg = null, bimg1; |
| int w = 10, h = 10; |
| float scaleFactor = 0.5f; |
| float offset = 0.0f; |
| |
| public static void main(String[] args) throws Exception { |
| RescaleAlphaTest test = new RescaleAlphaTest(); |
| test.startTest(); |
| } |
| |
| private void startTest() throws Exception { |
| |
| // Test with source image with alpha channel |
| |
| bimg = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); |
| Graphics2D g2d = bimg.createGraphics(); |
| g2d.setColor(Color.GREEN); |
| g2d.fillRect(0, 0, w, h); |
| |
| RescaleOp res = new RescaleOp(scaleFactor, offset, null); |
| bimg1 = res.filter(bimg, null); |
| |
| // check if destination image has alpha channel copied from src |
| checkForAlpha(bimg1); |
| |
| // Test with source image without alpha channel |
| bimg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); |
| g2d = bimg.createGraphics(); |
| g2d.setColor(Color.GREEN); |
| g2d.fillRect(0, 0, w, h); |
| |
| |
| res = new RescaleOp(scaleFactor, offset, null); |
| |
| // Create destination image with alpha channel |
| bimg1 = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); |
| bimg1 = res.filter(bimg, bimg1); |
| |
| // check if filtered destination image has alpha channel |
| checkForAlpha(bimg1); |
| |
| } |
| |
| private void checkForAlpha(BufferedImage bi) throws IOException { |
| int argb = bi.getRGB(w/2, h/2); |
| if ((argb >>> 24) != 255) { |
| throw new |
| RuntimeException("Wrong alpha in destination image.RescaleOp with alpha failed."); |
| } |
| } |
| } |