Benchmark GetTextExtent() and GetPartialTextExtents()

Add very simple benchmark of these 2 functions to allow (roughly)
comparing the advantage of using one compared to the other.

tests/benchmarks/graphics.cpp

@@ -64,7 +64,9 @@ struct GraphicsBenchmarkOptions
         testRawBitmaps =
         testRectangles =
         testCircles =
-        testEllipses = false;
+        testEllipses =
+        testTextExtent =
+        testPartialTextExtents = false;
 
         usePaint =
         useClient =
@@ -91,7 +93,9 @@ struct GraphicsBenchmarkOptions
          testRawBitmaps,
          testRectangles,
          testCircles,
-         testEllipses;
+         testEllipses,
+         testTextExtent,
+         testPartialTextExtents;
 
     bool usePaint,
          useClient,
@@ -396,6 +400,8 @@ private:
         BenchmarkRoundedRectangles(msg, dc);
         BenchmarkCircles(msg, dc);
         BenchmarkEllipses(msg, dc);
+        BenchmarkTextExtent(msg, dc);
+        BenchmarkPartialTextExtents(msg, dc);
     }
 
     void SetupDC(wxDC& dc)
@@ -612,6 +618,60 @@ private:
                  opts.numIters, t, (1000. * t)/opts.numIters);
     }
 
+    void BenchmarkTextExtent(const wxString& msg, wxDC& dc)
+    {
+        if ( !opts.testTextExtent )
+            return;
+
+        SetupDC(dc);
+
+        wxPrintf("Benchmarking %s: ", msg);
+        fflush(stdout);
+
+        const wxString str("The quick brown fox jumps over the lazy dog");
+        wxSize size;
+
+        wxStopWatch sw;
+        for ( long n = 0; n < opts.numIters; n++ )
+        {
+            size += dc.GetTextExtent(str);
+        }
+
+        const long t = sw.Time();
+
+        wxPrintf("%ld text extent measures done in %ldms = %gus/call\n",
+                 opts.numIters, t, (1000. * t)/opts.numIters);
+    }
+
+    void BenchmarkPartialTextExtents(const wxString& msg, wxDC& dc)
+    {
+        if ( !opts.testPartialTextExtents )
+            return;
+
+        SetupDC(dc);
+
+        wxPrintf("Benchmarking %s: ", msg);
+        fflush(stdout);
+
+        const wxString str("The quick brown fox jumps over the lazy dog");
+        wxArrayInt widths;
+
+        wxStopWatch sw;
+        for ( long n = 0; n < opts.numIters; n++ )
+        {
+            if ( !dc.GetPartialTextExtents(str, widths) )
+            {
+                wxPrintf("ERROR: GetPartialTextExtents() failed\n");
+                return;
+            }
+        }
+
+        const long t = sw.Time();
+
+        wxPrintf("%ld partial text extents measures done in %ldms = %gus/call\n",
+                 opts.numIters, t, (1000. * t)/opts.numIters);
+    }
+
     void BenchmarkBitmaps(const wxString& msg, wxDC& dc)
     {
         if ( !opts.testBitmaps )
@@ -786,6 +846,8 @@ public:
             { wxCMD_LINE_SWITCH, "",  "rectangles" },
             { wxCMD_LINE_SWITCH, "",  "circles" },
             { wxCMD_LINE_SWITCH, "",  "ellipses" },
+            { wxCMD_LINE_SWITCH, "",  "textextent" },
+            { wxCMD_LINE_SWITCH, "",  "partialtextextents" },
             { wxCMD_LINE_SWITCH, "",  "paint" },
             { wxCMD_LINE_SWITCH, "",  "client" },
             { wxCMD_LINE_SWITCH, "",  "memory" },
@@ -859,9 +921,12 @@ public:
         opts.testRectangles = parser.Found("rectangles");
         opts.testCircles = parser.Found("circles");
         opts.testEllipses = parser.Found("ellipses");
+        opts.testTextExtent = parser.Found("textextent");
+        opts.testPartialTextExtents = parser.Found("partialtextextents");
         if ( !(opts.testBitmaps || opts.testImages || opts.testLines
                     || opts.testRawBitmaps || opts.testRectangles
-                    || opts.testCircles || opts.testEllipses) )
+                    || opts.testCircles || opts.testEllipses
+                    || opts.testTextExtent || opts.testPartialTextExtents) )
         {
             // Do everything by default.
             opts.testBitmaps =
@@ -870,7 +935,9 @@ public:
             opts.testRawBitmaps =
             opts.testRectangles =
             opts.testCircles =
-            opts.testEllipses = true;
+            opts.testEllipses =
+            opts.testTextExtent =
+            opts.testPartialTextExtents = true;
         }
 
         opts.usePaint = parser.Found("paint");