Hi
This appears to be happening (at least) because cairo_pdf() delays
initialising a Cairo surface until BM_NewPage(), rather than
initiliasing a Cairo surface in BM_Open(), and replayPlot() triggers
some activity (set clip region) on the device BEFORE a new page is
started (so the pointer to the Cairo surface is null, so BOOM).
Not sure yet whether to blame replayPlot() for not starting with a new
page operation OR to blame cairo_pdf() for not initialising a Cairo
surface at device startup.
If anyone who knows more about Cairo (or cairo_pdf()) wants to point out
a good reason for the way cairo_pdf() currently works, please don't hold
back.
Paul
On 21/02/17 05:30, Yihui Xie wrote:
A quick follow-up: I just used cairo_pdf() as the recording device,
and it crashes R as well, so it is probably not relevant to pdf() but
an issue specific to cairo_pdf().
cairo_pdf()
dev.control('enable')
library("grid")
plot(1)
grid.text("A")
res = recordPlot()
dev.off()
cairo_pdf()
replayPlot(res)
dev.off()
Regards,
Yihui
--
https://yihui.name
On Mon, Feb 20, 2017 at 10:24 AM, Yihui Xie <x...@yihui.name> wrote:
Hi,
I wonder if this is expected or I'm doing a wrong thing.
pdf()
dev.control('enable')
library("grid")
plot(1)
grid.text("A")
res = recordPlot()
dev.off()
cairo_pdf()
replayPlot(res)
dev.off()
*** caught segfault ***
address 0x4, cause 'memory not mapped'
sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: macOS Sierra 10.12.3
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] tools_3.3.2 yaml_2.1.14
Regards,
Yihui
--
https://yihui.name
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--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
p...@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/
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