add initial bench for dashing (more work to do)

git-svn-id: http://skia.googlecode.com/svn/trunk@3841 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 80 insertions, 0 deletions

diff --git a/bench/DashBench.cpp b/bench/DashBench.cpp
new file mode 100644
index 0000000000..b741c8dfc6
--- /dev/null
+++ b/bench/DashBench.cpp
@@ -0,0 +1,80 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkBenchmark.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkDashPathEffect.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+#include "SkString.h"
+#include "SkTDArray.h"
+
+/*
+ *  Cases to consider:
+ *
+ *  1. antialiasing on/off (esp. width <= 1)
+ *  2. strokewidth == 0, 1, 2
+ *  3. hline, vline, diagonal, rect, oval
+ *  4. dots [1,1] ([N,N] where N=strokeWidth?) or arbitrary (e.g. [2,1] or [1,2,3,2])
+ */
+static void path_hline(SkPath* path) {
+    path->moveTo(SkIntToScalar(10), SkIntToScalar(10));
+    path->lineTo(SkIntToScalar(600), SkIntToScalar(10));
+}
+
+class DashBench : public SkBenchmark {
+    SkTDArray<SkScalar> fIntervals;
+
+    enum {
+        N = SkBENCHLOOP(100)
+    };
+public:
+    DashBench(void* param, const SkScalar intervals[], int count) : INHERITED(param) {
+        fIntervals.append(count, intervals);
+    }
+
+    virtual void makePath(SkPath* path) {
+        path_hline(path);
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return "dash";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        this->setupPaint(&paint);
+        paint.setStyle(SkPaint::kStroke_Style);
+//        paint.setStrokeWidth(SK_Scalar1);
+        paint.setAntiAlias(false);
+
+        SkPath path;
+        this->makePath(&path);
+
+        paint.setPathEffect(new SkDashPathEffect(fIntervals.begin(),
+                                                 fIntervals.count(), 0))->unref();
+        for (int i = 0; i < N; ++i) {
+            canvas->drawPath(path, paint);
+        }
+    }
+
+private:
+    typedef SkBenchmark INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static const SkScalar gDots[] = { SK_Scalar1, SK_Scalar1 };
+
+#define PARAM(array)    array, SK_ARRAY_COUNT(array)
+
+static SkBenchmark* gF0(void* p) { return new DashBench(p, PARAM(gDots)); }
+
+static BenchRegistry gR0(gF0);