--- /dev/null 2016-03-17 12:38:09.925772000 +0530 +++ new/test/java/awt/Graphics2D/DrawString/AADrawStringArtifact.java 2016-03-17 14:02:00.856158595 +0530 @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2016, 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. + */ +import java.awt.Color; +import java.awt.Font; +import java.awt.Graphics2D; +import java.awt.RenderingHints; +import java.awt.image.BufferedImage; +import java.io.IOException; + +/** + * @test + * @bug 8015070 + * @summary Tests for artifacts around the edges of anti-aliased text. + */ +public class AADrawStringArtifact { + /* Image dimensions */ + static final int TEST_IMAGE_WIDTH = 200; + static final int TEST_IMAGE_HEIGHT = 100; + + public AADrawStringArtifact() throws IOException { + /* Create a Graphics2D object from a BufferedImage */ + BufferedImage testImg = new BufferedImage(TEST_IMAGE_WIDTH, + TEST_IMAGE_HEIGHT, + BufferedImage.TYPE_INT_ARGB); + Graphics2D graphics = (Graphics2D) testImg.getGraphics(); + + /* Fill the image with translucent color */ + graphics.setColor(new Color(127, 127, 127, 127)); + graphics.fillRect(0, 0, TEST_IMAGE_WIDTH, TEST_IMAGE_HEIGHT); + + /* Drawstring with Antialiasing hint */ + graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, + RenderingHints.VALUE_TEXT_ANTIALIAS_ON); + Font font = new Font("Verdana" , Font.PLAIN, 60); + graphics.setFont(font); + graphics.setColor(new Color(255, 0, 0)); + graphics.drawString("Save", 30, 65); + graphics.dispose(); + + /* Check for artifacts */ + checkArtifacts(testImg); + } + + void checkArtifacts(BufferedImage testImage) throws IOException { + int componentMask = 0xff; + int colorThreshold = 200; + int rowIndex = 0; + int colIndex = 0; + + /* Loop through every pixel to check for possible artifact */ + for (rowIndex = 0; rowIndex < testImage.getHeight(); rowIndex++) { + for (colIndex = 0; colIndex < testImage.getWidth(); colIndex++) { + /* + * API: getRGB(x,y) returns color in INT_ARGB color space. + * Extract individual color components with a simple mask. + */ + int colorValue = testImage.getRGB(colIndex, rowIndex); + int colorComponent1 = colorValue & componentMask; + int colorComponent2 = (colorValue>>8) & componentMask; + int colorComponent3 = (colorValue>>16) & componentMask; + + /* + * Artifacts are predominantly a subjective decision based on + * the quality of the rendered image content. However, in the + * current use-case, the artifacts around the edges of the anti + * aliased text appear like spots of white pixels without any + * relation to the color of foreground text or the background + * translucent shape. + * + * To identify the artifact pixels, each color component from + * the testImage is compared with a constant threshold. The + * component threshold has been set based on observation from + * different experiments on mulitple Java versions. + */ + if (colorComponent1 >= colorThreshold + && colorComponent2 >= colorThreshold + && colorComponent3 >= colorThreshold) { + /* Artifact has been noticed. Report error. */ + throw new RuntimeException("Test Failed."); + } + } + } + } + + public static void main(String[] args) throws IOException { + /* Mere instantiating this object will suffice for automated test */ + AADrawStringArtifact artifactTest = new AADrawStringArtifact(); + } +}