Perhaps that "OpaqueCopyAnyToIntArgb" loop is the reason any read of
an image file into an TYPE_INT_RGB takes longer than reading into a
bytearray image.
BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
irp.setDestination(bi);
bi = reader.read(0,irp);
The above is much slower than:
BufferedImage bi = reader.read(0,null);
which produces a BI with a DataBufferByte
and this:
BufferedImage bi = new BufferedImage(width,height,BufferedImage.TYPE_INT_ARGB);
irp.setDestination(bi);
bi = reader.read(0,irp);
Doesn't work at all. It fails with --
java.lang.IllegalArgumentException: ImageReadParam num source & dest bands
differ!
at
javax.imageio.ImageReader.checkReadParamBandSettings(ImageReader.java:2746)
at
com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:907)
at
com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:864)
at pangnomic.PanGnomicImageFetch.makeBufferedImage(Unknown Source)
at pangnomic.PanGnomicImageFetch.run(Unknown Source)
at java.lang.Thread.run(Thread.java:595)
Jim Graham wrote:
I grepped for "Blit" and "ByteBinary" and discovered that there are only
convert (Blit(XX, SrcNoEa, YY)) loops for 1-bit to ARGB. The thing that
surprised me, though, was that it took 4 times longer even despite the
workarounds. I quickly ran a trace on copying a 1-bit image to INT_RGB
and discovered that it ends up using a loop called
"OpaqueCopyAnyToIntArgb" which is a Java loop that uses a couple of
method calls per pixel. There are faster ways it could do this, even
without creating a specific loop for this case, but it will take a bit
of elbow grease as the logic in that part of the system is a little
obscure...
...jim
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