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LWindow::UpdatePort()無処理時高速化
Subject: SUG -- LWindow::UpdatePort() quick bail out
 
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METROWERKS PRODUCT AND USAGE SECTION
 
Product name :            [ CodeWarrior Professional ]
Product version :         [ Pro 4 ]
Component name :          [ PowerPlant ]
Generating:               [ Mac OS 68K / Mac OS PowerPC ]
Purpose:                  [ application ]
 
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SUGGESTION
 
LWindow::UpdatePort() should have the following code to avoid slow
region operations if there is no redraw area.
Especially, the CW Pro4 addition of UpdatePort() call in the
LView::ScrollImageBy() slows down scrolling a bit without this.
 
void
LWindow::UpdatePort()
{
    //  quick bail out if no redraw area.
    //  EmptyRgn() is a quite cheap operation.
    if ( ::EmptyRgn(((WindowPeek)mMacWindowP)->updateRgn) )  return;

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