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

[Gerdus van Zyl]

Why can't you just pass the raw pixels to imagemagick?
(MagickImportImagePixels) or you could try the low-fi approach of
running the command line tools on the cairo created png.

~G

On Thu, Feb 12, 2009 at 5:47 PM, Pablo Romero <romero619 at hotmail.com> wrote:
>
>
> 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.
> Thanks,
> P.Romero
>
>
>
> ----------------------------------------
>> 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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>>
>>
>>
>> --
>> Counting bodies like sheep to the rhythm of the war drums.
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