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  fastest image writing  (Read 3577 times)
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Offline counterp

Senior Member


Medals: 11



« Posted 2011-08-11 21:28:17 »

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
« League of Dukes »

JGO Overlord


Medals: 783
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2011-08-11 21:56:27 »

TGA

it's basically a header + dump of the pixels

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Offline counterp

Senior Member


Medals: 11



« Reply #2 - Posted 2011-08-11 22:04:49 »

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
« League of Dukes »

JGO Overlord


Medals: 783
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #3 - Posted 2011-08-11 22:07:01 »

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

Senior Member


Medals: 11



« Reply #4 - Posted 2011-08-11 22:08:11 »

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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
« League of Dukes »

JGO Overlord


Medals: 783
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #5 - Posted 2011-08-11 22:09:50 »

btw: you can use BufferedImage().getType() to pick the correct backing DataBuffer

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Offline counterp

Senior Member


Medals: 11



« Reply #6 - Posted 2011-08-11 22:29:30 »

EDIT: Alright everything's working
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