[cairo-bugs] [Bug 4687] Getting pixel data

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https://bugs.freedesktop.org/show_bug.cgi?id=4687          
     

stevech1097 at yahoo.com.au changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |




------- Additional Comments From stevech1097 at yahoo.com.au  2005-10-14 00:25 -------
It does not solve the problem.
How can you import pixel-data into cairo from an external source, and export
pixel-data from cairo to an external application or library?

With png you can do:
  cairo_image_surface_create_from_png()
  cairo_surface_write_to_png()

How can you do the equivalent using pixel-data instead of png?
What is required is something like:
  "cairo_image_surface_create_from_pixel_data()"
  "cairo_surface_write_to_pixel_data()"

The first function is implemented by cairo_image_surface_create_for_data().
The second function is not implemented. You don't actually need to write the
pixel data, you just need to know where it is so you can read it. We just need
to be able to read
  image_surface->data
which could be provided by a function
  unsigned char *data = cairo_image_surface_get_data()

libpixman provides the equivalent function
  pixman_image_get_data()
why can't cairo_image_surface do the same?


          
     
     
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