Begun to use structs for the BView<->app_server communication. This makes

the protocoll less prone to errors, reduces possible points of failure and
most importantly, reduces the number of function calls to the link API.
I only know the numbers for StrokeLine(), which I tested via the Benchmark
test app. With this change, drawing random colored and positioned lines
actually doubled in speed. On the BView side, the calls to
ServerLink::Attach() only halfed, while on the app_server side, the number
of calls to ServerLink::Read() is now 1/4th. It will also be worth
investigating why the link stuff is so slow at all. I also optimized
BView::DrawString() a lot in this change, but I don't have any numbers
yet. Some other commands which used multiple Attach()/Read() calls were
also optimized, at least the most important ones. Begin/EndLineArray() was
also pretty bad on the app_server side. 


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29937 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/interface/ViewPrivate.h

@@ -15,6 +15,7 @@
 #include <Point.h>
 #include <Rect.h>
 #include <Region.h>
+#include <ServerProtocolStructs.h>
 
 const static uint32 kDeleteReplicant = 'JAHA';
 
@@ -121,21 +122,13 @@ ViewState::IsAllValid() const
 
 }	// namespace BPrivate
 
-struct _array_hdr_{
-	float			startX;
-	float			startY;
-	float			endX;
-	float			endY;
-	rgb_color		color;
-};
-
 struct _array_data_{
 		// the max number of points in the array
-	uint32			maxCount;
+	uint32				maxCount;
 		// the current number of points in the array
-	uint32			count;
+	uint32				count;
 		// the array of points
-	_array_hdr_*	array;
+	ViewLineArrayInfo*	array;
 };
 
 #endif	/* VIEW_PRIVATE_H */