[Webkit-unassigned] [Bug 45347] New: [EFL] Need to optimize Rendering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45347

           Summary: [EFL] Need to optimize Rendering
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: WebKit EFL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ryuan.choi at samsung.com


I tested how many rect was rendered.
EFL: until finishing google.com in EWebLauncher
[EFL] 6 will be drawn
[EFL] 0 will be drawn
[EFL] 11 will be drawn
[EFL] 2 will be drawn
[EFL] 4 will be drawn
[EFL] 4 will be drawn
[EFL] 4 will be drawn
[EFL] 2 will be drawn
[EFL] 5 will be drawn
[EFL] 14 will be drawn

GTK+: same condition
[GTK+] 1 rect will be drawn
[GTK+] 1 rect will be drawn
[GTK+] 1 rect will be drawn
[GTK+] 1 rect will be drawn
[GTK+] 1 rect will be drawn
[GTK+] 1 rect will be drawn
[GTK+] 1 rect will be drawn

Although count is good factor to measure render performance,
I believe that EWK have point of improvement.

I suggest below.
1. optimize code 
  a) remove 0 case, 
  b) move below code out of EINA_ITERATOR_FOREACH
     ewk_view_paint_context_translate(ctxt, -sx, -sy);

2. add shouldCoalesce like GTK+.

3. use cairo_region included in Cairo 1.10.0 with some logic.
  currently, EWK just add rectangle without considering region.

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