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using the region pool stuff so we're not constantly creating/destroying regions in the smooth scrolling code. Also use a stackbased helper to simplify error handling.

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pinkerton%netscape.com 1999-08-04 20:15:44 +00:00
parent ff7be90535
commit a4354658d0
1 changed files with 49 additions and 14 deletions
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61
widget/src/mac/nsWindow.cpp
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@ -39,6 +39,35 @@
#include "nsplugindefs.h"
#include "nsMacEventHandler.h"
#include "nsMacResources.h"
#include "nsRegionMac.h"
class StRegionFromPool
{
public:
StRegionFromPool();
~StRegionFromPool();
operator RgnHandle() const { return mRegionH; }
private:
RgnHandle mRegionH;
};
StRegionFromPool :: StRegionFromPool ( )
{
mRegionH = sNativeRegionPool.GetNewRegion();
}
StRegionFromPool :: ~StRegionFromPool ( )
{
if ( mRegionH )
sNativeRegionPool.ReleaseRegion(mRegionH);
}
#pragma mark -
//-------------------------------------------------------------------------
@ -1013,7 +1042,9 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
inTopDelta *= -1;
// Get Frame in local coords from clip rect (there might be a border around view)
RgnHandle clipRgn = ::NewRgn();
StRegionFromPool clipRgn;
if ( !clipRgn )
return;
::GetClip(clipRgn);
#if TARGET_CARBON
Rect frame;
@ -1021,7 +1052,9 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
#else
Rect frame = (**clipRgn).rgnBBox;
#endif
RgnHandle totalView = ::NewRgn();
StRegionFromPool totalView;
if ( !totalView )
return;
::RectRgn(totalView, &frame);
Rect source = inRectToScroll;
@ -1046,9 +1079,13 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
}
// compute the area that is to be updated by subtracting the dest from the visible area
RgnHandle updateRgn = ::NewRgn();
StRegionFromPool updateRgn;
if ( !updateRgn )
return;
::RectRgn(updateRgn, &frame);
RgnHandle destRgn = ::NewRgn();
StRegionFromPool destRgn;
if ( !destRgn )
return;
::RectRgn(destRgn, &dest);
::DiffRgn ( updateRgn, destRgn, updateRgn );
@ -1065,7 +1102,9 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
else
{
// compute the non-visable region
RgnHandle nonVisableRgn = ::NewRgn();
StRegionFromPool nonVisableRgn;
if ( !nonVisableRgn )
return;
::DiffRgn ( totalView, mWindowPtr->visRgn, nonVisableRgn );
// compute the extra area that may need to be updated
@ -1073,7 +1112,9 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
::OffsetRgn ( nonVisableRgn, -inLeftDelta, -inTopDelta );
// calculate a mask region to not copy the non-visble portions of the window from the port
RgnHandle copyMaskRgn = ::NewRgn();
StRegionFromPool copyMaskRgn;
if ( !copyMaskRgn )
return;
::DiffRgn(totalView, nonVisableRgn, copyMaskRgn);
// use copybits to simulate a ScrollRect()
@ -1093,9 +1134,6 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
// union the update regions together and invalidate them
::UnionRgn(nonVisableRgn, updateRgn, updateRgn);
::DisposeRgn ( nonVisableRgn );
::DisposeRgn ( copyMaskRgn );
}
#if TARGET_CARBON
@ -1104,10 +1142,7 @@ nsWindow :: ScrollBits ( Rect & inRectToScroll, PRInt32 inLeftDelta, PRInt32 inT
::InvalRgn(updateRgn);
#endif
::DisposeRgn ( clipRgn );
::DisposeRgn ( totalView );
::DisposeRgn ( updateRgn );
::DisposeRgn ( destRgn );
// NOTE: regions are cleaned up for us automagically by dtor's.
} // ScrollBits