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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - pdftoppm: out of memory; tries to allocate huge bitmap"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90596#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - pdftoppm: out of memory; tries to allocate huge bitmap"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90596">bug 90596</a>
from <span class="vcard"><a class="email" href="mailto:Thomas.Freitag@alfa.de" title="Thomas Freitag <Thomas.Freitag@alfa.de>"> <span class="fn">Thomas Freitag</span></a>
</span></b>
<pre>The huge bitmap is a tiling pattern including its repititions before it is
scaled to the resulting bitmap. This algorithm was introduced in poppler 0.17.0
and dramatically increased the speed for rendering when there is a high
repitition rate.
But in this case the tiling pattern itself is so huge, but the repitition count
in x and y direction is nearly always small, between 1 x 1 amd 2 x 2 in nearly
every of quite a lot tiling patterns.
So I give it a try to fall back to the old algorithm, where the tiling pattern
is rendered for every repitition again but directly to the resulting bitmap and
measured the time:
a) Without my changes:
time ./utils/pdftoppm -png -cropbox -r 300 90596.open/Page156.pdf output/90596
real 0m29.039s
user 0m28.395s
sys 0m0.275s
b) Use the fallback
time ./utils/pdftoppm -png -cropbox -r 300 90596.open/Page156.pdf
output/90596-new
real 0m25.754s
user 0m25.592s
sys 0m0.170s
So it's even faster to use the fallback here.
So I create a patch where it falls back to the old algorithm if repeatX *
repeatY <= 4 and measure the time of my regression test:
a) Without changes:
Refs created in 44 minutes and 32 seconds
b) With limit and fallback:
Refs created in 41 minutes and 4 seconds
So I will upload a patch when a solution for <a class="bz_bug_link
bz_status_NEW "
title="NEW - pdftoppm takes a long time to render a PDF"
href="show_bug.cgi?id=94053">bug 94053</a> will be committed.</pre>
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