107 lines
3.9 KiB
Java
107 lines
3.9 KiB
Java
/*
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* Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4286726
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* @summary Java2D raster printing: large text may overflow glyph cache.
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* Draw a large glyphvector, the 'A' glyph should appear and not get flushed.
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*/
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.font.FontRenderContext;
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import java.awt.font.GlyphVector;
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import java.awt.geom.Point2D;
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import java.awt.image.BufferedImage;
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import java.util.HashMap;
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/**
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* Draw a very large glyphvector on a surface.
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* If the cache was flushed the first glyph is not rendered.
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* Note: the implementation no longer uses glyphs for rendering large text,
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* but in principle the test is still useful.
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*/
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public class CacheFlushTest {
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static final int WIDTH = 400, HEIGHT = 600;
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static final int FONTSIZE = 250;
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static final String TEST = "ABCDEFGHIJKLMNOP";
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static final HashMap<RenderingHints.Key, Object> HINTS = new HashMap<>();
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static {
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HINTS.put(RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON);
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HINTS.put(RenderingHints.KEY_TEXT_ANTIALIASING,
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RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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HINTS.put(RenderingHints.KEY_FRACTIONALMETRICS,
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RenderingHints.VALUE_FRACTIONALMETRICS_ON);
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}
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public static void main(String args[]) {
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BufferedImage bi = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
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Graphics2D g2d = bi.createGraphics();
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g2d.addRenderingHints(HINTS);
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g2d.setColor(Color.white);
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g2d.fillRect(0, 0, WIDTH, HEIGHT);
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g2d.setColor(Color.black);
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FontRenderContext frc = g2d.getFontRenderContext();
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Font font = new Font(Font.DIALOG, Font.PLAIN, 250);
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GlyphVector gv = font.createGlyphVector(frc, TEST);
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/* Set the positions of all but the first glyph to be offset vertically but
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* FONTSIZE pixels. So if the first glyph "A" is not flushed we can tell this
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* by checking for non-white pixels in the range for the default y offset of 0
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* from the specified y location.
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*/
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Point2D.Float pt = new Point2D.Float(20f, FONTSIZE);
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for (int i = 1; i < gv.getNumGlyphs(); ++i) {
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gv.setGlyphPosition(i, pt);
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pt.x += 25f;
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pt.y = FONTSIZE;
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}
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g2d.drawGlyphVector(gv, 20, FONTSIZE);
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/* Now expect to find at least one black pixel in the rect (0,0) -> (WIDTH, FONTSIZE) */
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boolean found = false;
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int blackPixel = Color.black.getRGB();
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for (int y = 0; y < FONTSIZE; y++) {
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for (int x = 0; x < WIDTH; x++) {
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if (bi.getRGB(x, y) == blackPixel) {
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found = true;
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break;
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}
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}
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if (found == true) {
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break;
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}
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}
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if (!found) {
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throw new RuntimeException("NO BLACK PIXELS");
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}
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}
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}
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