Java-Gaming.org    
Featured games (91)
games approved by the League of Dukes
Games in Showcase (577)
games submitted by our members
Games in WIP (498)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Hardware cursor (another buffer problem)  (Read 914 times)
0 Members and 1 Guest are viewing this topic.
Offline weston

Junior Member





« Posted 2004-12-14 08:17:36 »

I'm writing a method that I will be able to easily re-use for making a hardware cursor (with the option of it being animated) and I've run into a problem with the image data I'm giving it. There are two methods involved with this problem, the first is the method for creating the cursor with a single image, the second is a method for converting an image to bytes.

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
public static Cursor createHWCursor(BufferedImage image, int xHotSpot, int yHotSpot)
  {                  
    IntBuffer imageBytes = ImageUtils.convertImageToBytes(image).asIntBuffer();
   
    IntBuffer bufferedDelays = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
    bufferedDelays.put(0);
    bufferedDelays.flip();
   
    try
    {
      return new Cursor(image.getWidth(), image.getHeight(), xHotSpot, yHotSpot, 1, imageBytes, bufferedDelays);
    } catch (LWJGLException ex)
    {
      ex.printStackTrace();
      return null;
    }
  }


1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
public static ByteBuffer convertImageToBytes(BufferedImage bufferedImage) 
    {
        ByteBuffer imageBuffer = null;
       
        byte[] data = ((DataBufferByte) bufferedImage.getRaster().getDataBuffer()).getData();

        imageBuffer = ByteBuffer.allocateDirect(data.length);
        imageBuffer.order(ByteOrder.nativeOrder());
        imageBuffer.put(data, 0, data.length);
        imageBuffer.flip();
       
        return imageBuffer;
    }


I am getting this error:
java.lang.IllegalArgumentException: Number of remaining buffer elements is 825, must be at least 3300

at this line:
return new Cursor(image.getWidth(), image.getHeight(), xHotSpot, yHotSpot, 1, imageBytes, bufferedDelays);

any ideas? I'm lost...

for(int i = 1; i > 0; i++)
{
System.out.println(i+" cups of java downed");
}
Offline weston

Junior Member





« Reply #1 - Posted 2004-12-14 10:28:07 »

Problem solved once again, this time not by my own doing though. Thanks to Matzon in the irc channel! The pixel format wasn't correct so the byte[] holding the image data was too small. Also the image needed to be square for it to work.

for(int i = 1; i > 0; i++)
{
System.out.println(i+" cups of java downed");
}
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

xsi3rr4x (18 views)
2014-04-15 18:08:23

BurntPizza (15 views)
2014-04-15 03:46:01

UprightPath (28 views)
2014-04-14 17:39:50

UprightPath (13 views)
2014-04-14 17:35:47

Porlus (29 views)
2014-04-14 15:48:38

tom_mai78101 (54 views)
2014-04-10 04:04:31

BurntPizza (111 views)
2014-04-08 23:06:04

tom_mai78101 (212 views)
2014-04-05 13:34:39

trollwarrior1 (181 views)
2014-04-04 12:06:45

CJLetsGame (187 views)
2014-04-01 02:16:10
List of Learning Resources
by Longarmx
2014-04-08 03:14:44

Good Examples
by matheus23
2014-04-05 13:51:37

Good Examples
by Grunnt
2014-04-03 15:48:46

Good Examples
by Grunnt
2014-04-03 15:48:37

Good Examples
by matheus23
2014-04-01 18:40:51

Good Examples
by matheus23
2014-04-01 18:40:34

Anonymous/Local/Inner class gotchas
by Roquen
2014-03-11 15:22:30

Anonymous/Local/Inner class gotchas
by Roquen
2014-03-11 15:05:20
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!