app_server: implement setting BAffineTransforms in BPicture

* Add a simple callback for the picture command

src/servers/app/ServerPicture.cpp

@@ -1,11 +1,12 @@
 /*
- * Copyright 2001-2010, Haiku.
+ * Copyright 2001-2015, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
  *		Marc Flerackers ([email protected])
  *		Stefano Ceccherini ([email protected])
  *		Marcus Overhagen <[email protected]>
+ *		Julian Harnath <[email protected]>
  */
 
 #include "ServerPicture.h"
@@ -372,6 +373,7 @@ fill_ellipse(Canvas* canvas, BPoint center, BPoint radii)
 {
 	BRect rect(center.x - radii.x, center.y - radii.y,
 		center.x + radii.x - 1, center.y + radii.y - 1);
+
 	canvas->PenToScreenTransform().Apply(&rect);
 	canvas->GetDrawingEngine()->DrawEllipse(rect, true);
 }
@@ -775,6 +777,13 @@ set_blending_mode(Canvas* canvas, int16 alphaSrcMode, int16 alphaFncMode)
 }
 
 
+static void
+set_transform(Canvas* canvas, BAffineTransform transform)
+{
+	canvas->CurrentState()->SetTransform(transform);
+}
+
+
 static void
 reserved()
 {
@@ -829,7 +838,8 @@ const static void* kTableEntries[] = {
 	(const void*)set_font_shear,
 	(const void*)reserved,				//	45
 	(const void*)set_font_face,
-	(const void*)set_blending_mode		//	47
+	(const void*)set_blending_mode,
+	(const void*)set_transform			//  48
 };