[cairo] Newbie backend questions
Jacob Gorm Hansen
jacobg at diku.dk
Thu Feb 10 18:04:36 PST 2005
hi,
I am new to Cairo, and I am trying to write my own backend for a system
where all grahics are sent to the screen as 32x32xARGB tiles.
I have been hacking my own version of the image backend, the idea was to
initially wrap calls to the pixman rendering functions in loops drawing
to 32x32 pixman_images, and then changing the image->pixels->data
pointer as I go, though it seems I would need to extend the interface to
libpixman to allow offsetting of input data.
An alternative would be to modify libpixman to support a different
memory layout for images, with a switch at creation time.
Are any of these ideas insane / has other had experiences doing
something similar?
Also:
When reading through functions such as pixman_composite_trapezoids(),
there seems to be quite heavy use of malloc() and free(), even though
the data structures created are constant-size and go out of scope
quickly. Is there a good reason that these are not allocated on the
stack, as that presumably be faster and more robust?
best regards,
Jacob
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