Bug 4445 – Optimizations to KCanvas

• Status: RESOLVED
• Resolution: FIXED
• Component: SVG

[Tobias Lidskog]

Some minor changes can be made to KCanvasContainer to optimize bounding box calculation and hit 
testing.

[Tobias Lidskog]

Created attachment 3410 [details]
KCanvasContainer optimizations

This patch also fixes two bugs in KCanvasContainer::collisions
1) the recursive loop return without examining all nodes (fixed in kde svn)
2) hit test for fill rect uses bounding box for path including stroke

[Tobias Lidskog]

Updated bug title

Will include a few more kcanvas optimizations for review in this bug. Layout tests need to be updated, but 
I'd rather do that once all changes have been reviewed to make merging easier.

[Tobias Lidskog]

Created attachment 3413 [details]
kCanvasItem optimizations

add caching of stroked bounding box, since it's more expensive to calculate

[Eric Seidel (no email)]

Comment on attachment 3413 [details]
kCanvasItem optimizations

The code could be simpler.  

+	     if(d->path && canvas() && canvas()->renderingDevice())
+	     {
+		 result = bboxPath(true);
+	     }

and then an if, storing result in the appropriate place, followed by the
return...   I'll fix it when landing.

[Eric Seidel (no email)]

Comment on attachment 3410 [details]
KCanvasContainer optimizations

Do you have any way of showing that this is actually faster?

[Eric Seidel (no email)]

Commited item optimizations.  Please file a separate bug for the remaining container optimizations.