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List: openjdk-2d-dev
Subject: Re: [OpenJDK 2D-Dev] <AWT Dev> Fwd: creating images using native code
From: Alan Snyder <javalists () cbfiddle ! com>
Date: 2015-08-20 16:48:37
Message-ID: 7AFEC7C7-C0A1-4C6D-99F2-E441C6A9BEEB () cbfiddle ! com
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I have filed an RFE <https://bugs.openjdk.java.net/browse/JDK-8133998>.
Alan
> On Aug 18, 2015, at 9:58 AM, Sergey Bylokhov <Sergey.Bylokhov@oracle.com> wrote:
>
> This is 2d related question (cc 2d-dev).
> > From: Alan Snyder < <mailto:javalists@cbfiddle.com>javalists@cbfiddle.com \
> > <mailto:javalists@cbfiddle.com>>
> > Subject: <AWT Dev> creating images using native code
> > Date: August 11, 2015 at 5:36:55 PM PDT
> > To: awt-dev@openjdk.java.net <mailto:awt-dev@openjdk.java.net>
> >
> > I am currently creating images with data provided by native code by capturing the \
> > data in an int array then using that array to construct a DataBufferInt which is \
> > used to create a WritableRaster which is used to create a BufferedImage.
> > That seems to work fine, except that looking at the code it appears that the \
> > buffer is considered untrackable, which sounds like a bad thing. Does that in \
> > fact prevent caching the image in a GPU, for example?
> Yes you are right, because in this case we cannot be sure when the data inside the \
> raster is changed, this can occur for example when we copy this data from/to gpu.
> >
> > If so, is there a good way to create a cacheable image?
> The public way is to draw the image once again to another one which will be cached \
> instead.
> >
> > The solutions I have found so far all wind up processing the pixels one at a time \
> > at some point, as far as I can tell, which should not be necessary.
> > I'm wondering why there is no way to simply declare that the buffer will not \
> > change in the future.
> > Alan
> >
>
>
>
> --
> Best regards, Sergey.
[Attachment #3 (unknown)]
<html><head><meta http-equiv="Content-Type" content="text/html \
charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; \
-webkit-line-break: after-white-space;" class=""><div class="">I have filed \
an <a href="https://bugs.openjdk.java.net/browse/JDK-8133998" \
class="">RFE</a>.</div><div class=""><br class=""></div> Alan<div class=""><br \
class=""></div><div class=""><br class=""></div><div class=""><br \
class=""><div><blockquote type="cite" class=""><div class="">On Aug 18, 2015, at 9:58 \
AM, Sergey Bylokhov <<a href="mailto:Sergey.Bylokhov@oracle.com" \
class="">Sergey.Bylokhov@oracle.com</a>> wrote:</div><br \
class="Apple-interchange-newline"><div class="">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" class="">
<div bgcolor="#FFFFFF" text="#000000" class="">
<div class="">This is 2d related question (cc 2d-dev).<br \
class="Apple-interchange-newline"> <div class="">
<blockquote type="cite" class="">
<div style="margin-top: 0px; margin-right: 0px; margin-bottom:
0px; margin-left: 0px;" class=""><span style="font-family: \
-webkit-system-font, 'Helvetica Neue', Helvetica, sans-serif;" class=""><b \
class="">From: </b></span><span style="font-family:
-webkit-system-font, Helvetica Neue, Helvetica,
sans-serif;" class="">Alan Snyder <<a moz-do-not-send="true" \
href="mailto:javalists@cbfiddle.com" class=""></a><a class="moz-txt-link-abbreviated" \
href="mailto:javalists@cbfiddle.com">javalists@cbfiddle.com</a>><br class=""> \
</span></div> <div style="margin-top: 0px; margin-right: 0px; margin-bottom:
0px; margin-left: 0px;" class=""><span style="font-family: \
-webkit-system-font, 'Helvetica Neue', Helvetica, sans-serif;" class=""><b \
class="">Subject: </b></span><span style="font-family:
-webkit-system-font, Helvetica Neue, Helvetica,
sans-serif;" class=""><b class=""><AWT Dev> creating
images using native code</b><br class="">
</span></div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom:
0px; margin-left: 0px;" class=""><span style="font-family: \
-webkit-system-font, 'Helvetica Neue', Helvetica, sans-serif;" class=""><b \
class="">Date: </b></span><span style="font-family:
-webkit-system-font, Helvetica Neue, Helvetica,
sans-serif;" class="">August 11, 2015 at 5:36:55 PM PDT<br class="">
</span></div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom:
0px; margin-left: 0px;" class=""><span style="font-family: \
-webkit-system-font, 'Helvetica Neue', Helvetica, sans-serif;" class=""><b \
class="">To: </b></span><span style="font-family:
-webkit-system-font, Helvetica Neue, Helvetica,
sans-serif;" class=""><a moz-do-not-send="true" \
href="mailto:awt-dev@openjdk.java.net" class="">awt-dev@openjdk.java.net</a><br \
class=""> </span></div>
<br class="">
<div class="">I am currently creating images with data
provided by native code by capturing the data in an int
array then using that array to construct a DataBufferInt
which is used to create a WritableRaster which is used to
create a BufferedImage.<br class="">
<br class="">
That seems to work fine, except that looking at the code it
appears that the buffer is considered untrackable, which
sounds like a bad thing. Does that in fact prevent caching
the image in a GPU, for example?<br class="">
</div>
</blockquote>
Yes you are right, because in this case we cannot be sure when
the data inside the raster is changed, this can occur for
example when we copy this data from/to gpu.<br class="">
<br class="">
<blockquote type="cite" class="">
<div class=""><br class="">
If so, is there a good way to create a cacheable image?<br class="">
</div>
</blockquote>
The public way is to draw the image once again to another one
which will be cached instead.<br class="">
<br class="">
<blockquote type="cite" class="">
<div class=""><br class="">
The solutions I have found so far all wind up processing the
pixels one at a time at some point, as far as I can tell,
which should not be necessary.<br class="">
<br class="">
I'm wondering why there is no way to simply declare that the
buffer will not change in the future.<br class="">
<br class="">
Alan<br class="">
<br class="">
</div>
</blockquote>
</div>
<br class="">
</div>
<blockquote cite="mid:121DE4C1-E74B-426D-9344-9ACEBA420830@cbfiddle.com" \
type="cite" class=""> </blockquote>
<br class="">
<br class="">
<pre class="moz-signature" cols="72">--
Best regards, Sergey. </pre>
</div>
</div></blockquote></div><br class=""></div></body></html>
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