avoid a crash if used without attached buffer

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12090 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/app/drawing/Painter/Painter.cpp

@@ -612,26 +612,29 @@ Painter::DrawString(const char* utf8String, uint32 length,
 {
 	fPatternHandler->SetPattern(B_SOLID_HIGH);
 
-	Transformable transform;
+	if (fBuffer) {
-// TODO: convert BFont::Shear(), which is in degrees 45°...135° to whatever AGG is using
-//	transform.ShearBy(B_ORIGIN, fFont.Shear(), 0.0);
-	transform.RotateBy(B_ORIGIN, -fFont.Rotation());
-	transform.TranslateBy(baseLine);
-	transform.ScaleBy(B_ORIGIN, fScale, fScale);
-	transform.TranslateBy(fOrigin);
 
-	fTextRenderer->RenderString(utf8String,
+		Transformable transform;
-								length,
+// TODO: convert BFont::Shear(), which is in degrees 45°...135° to whatever AGG is using
-								fFontRendererSolid,
+//		transform.ShearBy(B_ORIGIN, fFont.Shear(), 0.0);
-								fFontRendererBin,
+		transform.RotateBy(B_ORIGIN, -fFont.Rotation());
-								transform,
+		transform.TranslateBy(baseLine);
-								&fPenLocation);
+		transform.ScaleBy(B_ORIGIN, fScale, fScale);
-	// pen location is not transformed in quite the same way,
+		transform.TranslateBy(fOrigin);
-	// or transformations would add up
+	
-	transform.Reset();
+		fTextRenderer->RenderString(utf8String,
-	transform.RotateBy(B_ORIGIN, -fFont.Rotation());
+									length,
-	transform.TranslateBy(baseLine);
+									fFontRendererSolid,
-	transform.Transform(&fPenLocation);
+									fFontRendererBin,
+									transform,
+									&fPenLocation);
+		// pen location is not transformed in quite the same way,
+		// or transformations would add up
+		transform.Reset();
+		transform.RotateBy(B_ORIGIN, -fFont.Rotation());
+		transform.TranslateBy(baseLine);
+		transform.Transform(&fPenLocation);
+	}
 }
 
 // DrawString