Alexander Larsson <al...@redhat.com> writes:
> * Try a tile-based approach for GtkPixelCache to avoid having
> to do a same-surface copy (usign an intermediate surface) when
> scrolling the cache.
An alternative to tiles is to keep track of an origin within the
surface:
+--------+--------------------------+
| Bot R | Bottom left |
| | |
+--------O--------------------------+
| Top R | Top left |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
+--------+--------------------------+
with the contents of the surface addressed modulo width and
height. Scrolling is then just a matter of moving that origin, but
copying from the surface may require four separate blits. Similarly,
rendering to some rectangle may have to be split into four separate
operations.
Søren
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