On 13/12/2022 23:39, Thiessen, Paul (NIH/NLM/NCBI) [E] via Rdkit-discuss
wrote:
Hi folks,
I’m trying to use the MolDraw2DCairo class to generate PNG images. But
no matter what I’ve tried, including setting the ‘noFreetype’ param to
true in the c’tor, I get an empty string from getDrawingText() and an
exception with message “PNG header not recognized”. I traced this
problem to the call to cairo_surface_write_to_png_stream() in
MolDraw2DCairo.cpp, which gives an empty string and returns the cairo
error/status “no memory.” Any ideas what’s causing this? I know
nothing about cairo/freetype… I’m using cairo 1.16.
Are you linking the RDKit with other libraries? In my case, which gave
weird png errors like yours, I was linking to other libraries that
depended on a different version of libpng.
Paul.
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