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Java-Gaming.org > Game Development > Performance Tuning > fastest image writing
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  fastest image writing  (Read 1539 times)
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Offline counterp

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« on: 2011-08-11 17:28:17 »
ImageIO.write is dangerously slow and I guess that's because it's compressing the image to another format.

So how do I go about doing this, when size isn't a factor?

The fastest method of writing an image. Do I grab all pixels and write them?
Offline Riven
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« Reply #1 on: 2011-08-11 17:56:27 »
TGA

it's basically a header + dump of the pixels
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Offline counterp

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« Reply #2 on: 2011-08-11 18:04:49 »
Is there a faster way of getting all the pixels or do I just have to use

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BufferedImage img = region.images[i];
int[] ARGB = new int[w * h];
img.getRGB(0, 0, w, h, ARGB, 0, w);


is there a way to avoid the integer array all together and write info directly to a byte array?
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Offline Riven
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« Reply #3 on: 2011-08-11 18:07:01 »
about a zillion times faster:
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   public static int[] accessRasterIntArray(BufferedImage src)
   {
      return ((DataBufferInt) src.getRaster().getDataBuffer()).getData();
   }

   public static byte[] accessRasterByteArray(BufferedImage src)
   {
      return ((DataBufferByte) src.getRaster().getDataBuffer()).getData();
   }
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Offline counterp

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« Reply #4 on: 2011-08-11 18:08:11 »
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public static byte[] accessRasterByteArray(BufferedImage src)
{
   return ((DataBufferByte) src.getRaster().getDataBuffer()).getData();
}


I think that was exactly what I was looking for Wink

thanks
Offline Riven
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« Reply #5 on: 2011-08-11 18:09:50 »
btw: you can use BufferedImage().getType() to pick the correct backing DataBuffer
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Offline counterp

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Posts: 235
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« Reply #6 on: 2011-08-11 18:29:30 »
EDIT: Alright everything's working
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