* Adopt the code to handle the case that even a HWInterface instance with

hardware accelerated functions could be double buffered.
* Align the rectangle used for arc drawing like those for ellipsis.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26544 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/drawing/DrawingEngine.cpp

@@ -526,8 +526,11 @@ DrawingEngine::CopyRegion(/*const*/ BRegion* region,
 	}
 
 	// trigger the HW accelerated version if is was available
-	if (sortedRectList)
+	if (sortedRectList) {
 		fGraphicsCard->CopyRegion(sortedRectList, count, xOffset, yOffset);
+		if (fGraphicsCard->IsDoubleBuffered())
+			fGraphicsCard->Invalidate(region->Frame());
+	}
 
 	delete[] sortedRectList;
 }
@@ -540,7 +543,9 @@ DrawingEngine::InvertRect(BRect r)
 
 	make_rect_valid(r);
 	r = fPainter->ClipRect(r);
-	if (r.IsValid()) {
+	if (!r.IsValid())
+		return;
+
 	AutoFloatingOverlaysHider _(fGraphicsCard, r);
 
 	// try hardware optimized version first
@@ -548,12 +553,12 @@ DrawingEngine::InvertRect(BRect r)
 		BRegion region(r);
 		region.IntersectWith(fPainter->ClippingRegion());
 		fGraphicsCard->InvertRegion(region);
+		if (fGraphicsCard->IsDoubleBuffered())
+			_CopyToFront(r);
 	} else {
 		fPainter->InvertRect(r);
-
 		_CopyToFront(r);
 	}
-	}
 }
 
 // DrawBitmap
@@ -575,16 +580,20 @@ DrawingEngine::DrawBitmap(ServerBitmap *bitmap,
 
 // DrawArc
 void
-DrawingEngine::DrawArc(BRect r, const float &angle,
-					   const float &span, bool filled)
+DrawingEngine::DrawArc(BRect r, const float &angle, const float &span,
+	bool filled)
 {
 	CRASH_IF_NOT_LOCKED
 
 	make_rect_valid(r);
+	fPainter->AlignEllipseRect(&r, filled);
 	BRect clipped(r);
+
 	if (!filled)
 		extend_by_stroke_width(clipped, fPainter->PenSize());
+
 	clipped = fPainter->ClipRect(r);
+
 	if (clipped.IsValid()) {
 		AutoFloatingOverlaysHider _(fGraphicsCard, clipped);
 
@@ -731,7 +740,9 @@ DrawingEngine::FillRect(BRect r, const rgb_color& color)
 	// gut feeling.
 	make_rect_valid(r);
 	r = fPainter->ClipRect(r);
-	if (r.IsValid()) {
+	if (!r.IsValid())
+		return;
+
 	AutoFloatingOverlaysHider overlaysHider(fGraphicsCard, r);
 
 	// try hardware optimized version first
@@ -739,14 +750,14 @@ DrawingEngine::FillRect(BRect r, const rgb_color& color)
 		BRegion region(r);
 		region.IntersectWith(fPainter->ClippingRegion());
 		fGraphicsCard->FillRegion(region, color,
-									  fSuspendSyncLevel == 0
-									  || overlaysHider.WasHidden());
+			fSuspendSyncLevel == 0 || overlaysHider.WasHidden());
+
+		if (fGraphicsCard->IsDoubleBuffered())
+			_CopyToFront(r);
 	} else {
 		fPainter->FillRect(r, color);
-
 		_CopyToFront(r);
 	}
-	}
 }
 
 
@@ -778,11 +789,12 @@ DrawingEngine::FillRegion(BRegion& r, const rgb_color& color)
 		&& frame.Width() * frame.Height() > 100) {
 		fGraphicsCard->FillRegion(r, color, fSuspendSyncLevel == 0
 											|| overlaysHider.WasHidden());
+		if (fGraphicsCard->IsDoubleBuffered())
+			_CopyToFront(frame);
 	} else {
 		int32 count = r.CountRects();
-		for (int32 i = 0; i < count; i++) {
+		for (int32 i = 0; i < count; i++)
 			fPainter->FillRectNoClipping(r.RectAtInt(i), color);
-		}
 
 		_CopyToFront(frame);
 	}
@@ -817,7 +829,9 @@ DrawingEngine::FillRect(BRect r)
 
 	make_rect_valid(r);
 	r = fPainter->AlignAndClipRect(r);
-	if (r.IsValid()) {
+	if (!r.IsValid())
+		return;
+
 	AutoFloatingOverlaysHider overlaysHider(fGraphicsCard, r);
 
 	bool doInSoftware = true;
@@ -855,12 +869,11 @@ DrawingEngine::FillRect(BRect r)
 		doInSoftware = false;
 	}
 
-		if (doInSoftware) {
+	if (doInSoftware)
 		fPainter->FillRect(r);
 
+	if (fGraphicsCard->IsDoubleBuffered())
 		_CopyToFront(r);
-		}
-	}
 }
 
 
@@ -870,7 +883,9 @@ DrawingEngine::FillRegion(BRegion& r)
 	CRASH_IF_NOT_LOCKED
 
 	BRect clipped = fPainter->ClipRect(r.Frame());
-	if (clipped.IsValid()) {
+	if (!clipped.IsValid())
+		return;
+
 	AutoFloatingOverlaysHider overlaysHider(fGraphicsCard, clipped);
 
 	bool doInSoftware = true;
@@ -907,13 +922,12 @@ DrawingEngine::FillRegion(BRegion& r)
 		BRect touched = fPainter->FillRect(r.RectAt(0));
 
 		int32 count = r.CountRects();
-			for (int32 i = 1; i < count; i++) {
+		for (int32 i = 1; i < count; i++)
 			touched = touched | fPainter->FillRect(r.RectAt(i));
 	}
 
-			_CopyToFront(touched);
-		}
-	}
+	if (fGraphicsCard->IsDoubleBuffered())
+		_CopyToFront(r.Frame());
 }