257 |
virtual paper (e.g., the margins of the web page being scrolled) |
virtual paper (e.g., the margins of the web page being scrolled) |
258 |
or an external coordinate system, independent of the page |
or an external coordinate system, independent of the page |
259 |
(e.g., in another window). |
(e.g., in another window). |
260 |
This is originally because of performance: it is most efficient to update |
This was originally done for performance: updating |
261 |
a single, rectangular (or rectangular, rectangularly obscured) area |
a single, rectangular (or rectangular, rectangularly obscured) area |
262 |
of screen. |
of screen is most efficient. |
263 |
For the same reason, smooth scaling is only seldom used. |
For the same reason, smooth scaling is only seldom used. |
264 |
|
|
265 |
With modern graphics hardware, there is no need to be limited to rectangular sections |
With modern graphics hardware, there is no need to be limited to rectangular sections |