/*
* Copyright ( c ) 2009 , 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 6296893
* @ summary Test verifies that the isTopDown flag does not cause
* a writing of bmp image in wrong scanline layout .
* @ run main TopDownTest
*/
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.image.IndexColorModel;
import java.io.File;
import java.io.IOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.bmp.BMPImageWriteParam;
import javax.imageio.stream.ImageOutputStream;
import static java.awt.image.BufferedImage.TYPE_INT_RGB;
import static java.awt.image.BufferedImage.TYPE_BYTE_INDEXED;
public class TopDownTest {
public static void main(String[] args) throws IOException {
BufferedImage src = createTestImage(24 );
writeWithCompression(src, "BI_BITFIELDS" );
writeWithCompression(src, "BI_RGB" );
src = createTestImage(8 );
writeWithCompression(src, "BI_RLE8" );
src = createTestImage(4 );
writeWithCompression(src, "BI_RLE4" );
}
private static void writeWithCompression(BufferedImage src,
String compression) throws IOException
{
System.out.println("Compression: " + compression);
ImageWriter writer = ImageIO.getImageWritersByFormatName("BMP" ).next();
if (writer == null ) {
throw new RuntimeException("Test failed: no bmp writer available" );
}
File fout = File.createTempFile(compression + "_" , ".bmp" ,
new File("." ));
ImageOutputStream ios = ImageIO.createImageOutputStream(fout);
writer.setOutput(ios);
BMPImageWriteParam param = (BMPImageWriteParam)
writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionType(compression);
param.setTopDown(true );
writer.write(null , new IIOImage(src, null , null ), param);
writer.dispose();
ios.flush();
ios.close();
BufferedImage dst = ImageIO.read(fout);
verify(dst);
}
private static void verify(BufferedImage dst) {
int top_rgb = dst.getRGB(50 , 25 );
System.out.printf("top_rgb: %x\n" , top_rgb);
int bot_rgb = dst.getRGB(50 , 75 );
System.out.printf("bot_rgb: %x\n" , bot_rgb);
// expect to see blue color on the top of image
if (top_rgb != 0 xff0000ff) {
throw new RuntimeException("Invaid top color: " +
Integer.toHexString(bot_rgb));
}
if (bot_rgb != 0 xffff0000) {
throw new RuntimeException("Invalid bottom color: " +
Integer.toHexString(bot_rgb));
}
}
private static BufferedImage createTestImage(int bpp) {
BufferedImage img = null ;
switch (bpp) {
case 8 :
img = new BufferedImage(100 , 100 , TYPE_BYTE_INDEXED);
break ;
case 4 : {
byte [] r = new byte [16 ];
byte [] g = new byte [16 ];
byte [] b = new byte [16 ];
r[1 ] = (byte )0 xff;
b[0 ] = (byte )0 xff;
IndexColorModel icm = new IndexColorModel(4 , 16 , r, g, b);
img = new BufferedImage(100 , 100 , TYPE_BYTE_INDEXED, icm);
}
break ;
case 24 :
default :
img = new BufferedImage(100 , 100 , TYPE_INT_RGB);
}
Graphics g = img.createGraphics();
g.setColor(Color.blue);
g.fillRect(0 , 0 , 100 , 50 );
g.setColor(Color.red);
g.fillRect(0 , 50 , 100 , 50 );
g.dispose();
return img;
}
}
Messung V0.5 in Prozent C=88 H=91 G=89
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-06-10)
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