Re^3: Memory File and wxPerl


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Re^3: Memory File and wxPerl

by BrowserUk (Patriarch)

on Mar 18, 2016 at 22:08 UTC ( [id://1158282]=note: print w/replies, xml )

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in reply to Re^2: Memory File and wxPerl
in thread Memory File and wxPerl

The XPM file approach looks like a very good next thing to try.

Actually, I think anonymonks pointer to newFromBits() is probably a better lead.

Whilst trying to look at that, I came across newFromPngData() which is described as: "Loads a bitmap from the memory containing image data in PNG format."; and sounds perfect for your purpose.

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Re^4: Memory File and wxPerl
by jmlynesjr (Deacon) on Mar 24, 2016 at 23:02 UTC

Findings:

Base GD can't output to an XPM file. However, I found the CPAN module GD::Convert that adds output options to GD, one of which is XPM. This seems to work as advertised and didn't have a problem creating the 600x600 image memory file.

NewFromPNGData is not wrapped in Wx. Per Mark Dootson(wxperl-users), the work around is:

open my $fh, '<', \$buffer;
my $bitmap = Wx::Bitmap->new(Wx::Image->new($fh, wxBITMAP_TYPE_PNG));
[download]

This works as well. I plan to try both methods and see if there is any speed difference(currently at a 35msec screen refresh rate). My gut feel is that I might not see a speed increase. The small file size may have been writing/reading within Linux I/O buffers and not from physical disk. More testing needed.

James

There's never enough time to do it right, but always enough time to do it over...

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