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

Dominic Lachowicz domlachowicz at gmail.com
Wed Feb 11 11:40:07 PST 2009

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 <romero619 at hotmail.com> 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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