[cairo] output png fully-formatted png image to STDOUT or memory location

Pablo Romero romero619 at hotmail.com
Thu Feb 12 07:47:22 PST 2009

Could someone please walk me through setting up a simple "cairo_write_func_t" function, that would print a png image to STDOUT and/or to a byte buffer in memory???
Im not a very strong C programmer.

> Date: Wed, 11 Feb 2009 14:40:07 -0500
> Subject: Re: [cairo] output png fully-formatted png image to STDOUT or memory location
> From: domlachowicz at gmail.com
> To: romero619 at hotmail.com
> CC: cairo at cairographics.org
> There's cairo_surface_write_to_png_stream(). Call that, with your
> "closure" = stdout, and your write function just a small wrapper
> around fwrite().
> Of course, you could write to a byte buffer in memory, and pass that
> to an ImageMagick blob just as easily.
> On Wed, Feb 11, 2009 at 2:33 PM, Pablo Romero wrote:
>> Hello,
>> IM trying to find a way to feed a cairo png image to imagemagick without having to write to a temporary disk file.
>> I looked into using cairo's image_surface_get_data() to return a pointer to the image pixels, but that unfortunately points to the raw image pixels, and I need to pass the full, "ready-to-write-to-disk" png image to imagemagick.
>> Is it possible to write a png file to STDOUT or to a specific, pre-allocated memory location???
>> more specifically, I only need 1 function from imagemagick that isnt avaible in cairo:
>> "setcompressionquality"
>> is it possible to set the compression quality on a png image in cairo????
>> this way I wouldnt have to deal with imagemagick
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