Gerdus van Zyl
gerdusvanzyl at gmail.com
Tue Jul 15 09:33:56 PDT 2008
The normal way of doing that is using
cairo_image_surface_create_for_data. The pixman library is used for
the software fallback if something can't be done in a native API, and
as such is not something you should be using directly.
The data you pass into cairo_image_surface_create_for_data or get from
cairo_image_surface_get_data can be directly inspected if you so wish
to get pixel values. Cairo doesn't have pixel value lookup functions
(getpixel,setpixel), so far I know.
It would be helpful to know what you wish to achieve.
On Tue, Jul 15, 2008 at 5:42 PM, Thomas Stover <thomas at wsinnovations.com> wrote:
> Thanks. I mainly was just interested in what it was, and what I might
> could do with it. I'm also trying to figure out the best way to load
> images from say libjpeg, or image magic and paste them in surfaces. I
> have also been helping a coworker insert some raster data (weather
> radar) in his project. We had been just using some helper functions I
> somewhat blindly made, but I would like to find the "right" way to do
> it. I'm looking at pixman.h now. Is there a better place to start?
> Behdad Esfahbod wrote:
>> On Tue, 2008-07-15 at 10:05 -0500, Thomas Stover wrote:
>>> quick question from the clueless: Being a very light participant in this
>>> list, I keep reading references to something called pixman. So I finally
>>> got around to trying to figure out what that is, and all I can find are
>>> some comments leading me to think it is some sort of cairo helper
>>> library for raster image buffers/pixel routines.
>> That's correct. You can download it from here:
>>> After still not finding
>>> a download or a doc, I thought to look maybe in the cairo source. No
>>> dice there either. I currently use some functions I put together for
>>> from reading the cairo docs to read write pixels on cairo image
>>> surfaces, but to say they could be better would be an understatement.
>>> Would somebody clue me in? How far off are my guesses?
>> I'm not sure what you are trying to do.
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