Add GrAAHairLinePathRenderer

Review URL: http://codereview.appspot.com/4926045



git-svn-id: http://skia.googlecode.com/svn/trunk@2196 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 112 insertions, 0 deletions

diff --git a/samplecode/SampleHairCurves.cpp b/samplecode/SampleHairCurves.cpp
new file mode 100644
index 0000000000..152cbeb09c
--- /dev/null
+++ b/samplecode/SampleHairCurves.cpp
@@ -0,0 +1,112 @@
+
+/*
+ * 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 "SampleCode.h"
+#include "SkView.h"
+#include "SkCanvas.h"
+#include "SkPath.h"
+#include "SkRandom.h"
+
+class HairCurvesView : public SampleView {
+public:
+    HairCurvesView() {
+    }
+    
+protected:
+    // overrides from SkEventSink
+    virtual bool onQuery(SkEvent* evt) {
+        if (SampleCode::TitleQ(*evt)) {
+            SampleCode::TitleR(evt, "HairCurves");
+            return true;
+        }
+        return this->INHERITED::onQuery(evt);
+    }
+
+
+    virtual void onDrawContent(SkCanvas* canvas) {
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setStrokeWidth(-1);
+        canvas->save();
+        canvas->scale(1000 * SK_Scalar1, 1000 * SK_Scalar1);
+        SkRandom rand;
+        SkPath curves;
+        SkPath hulls;
+        SkPath ctrlPts;
+        for (int i = 0; i < 100; ++i) {
+            SkScalar pts[] = {
+                rand.nextUScalar1(), rand.nextUScalar1(),
+                rand.nextUScalar1(), rand.nextUScalar1(),
+                rand.nextUScalar1(), rand.nextUScalar1(),
+                rand.nextUScalar1(), rand.nextUScalar1()
+            };
+            curves.moveTo(pts[0], pts[1]);
+            curves.cubicTo(pts[2], pts[3],
+                         pts[4], pts[5],
+                         pts[6], pts[7]);
+
+            hulls.moveTo(pts[0], pts[1]);
+            hulls.lineTo(pts[2], pts[3]);
+            hulls.lineTo(pts[4], pts[5]);
+            hulls.lineTo(pts[6], pts[7]);
+
+            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
+            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
+            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
+            ctrlPts.addCircle(pts[6], pts[7], SK_Scalar1 / 200);
+        }
+        for (int i = 0; i < 100; ++i) {
+            SkScalar pts[] = {
+                rand.nextUScalar1(), rand.nextUScalar1(),
+                rand.nextUScalar1(), rand.nextUScalar1(),
+                rand.nextUScalar1(), rand.nextUScalar1(),
+            };
+            curves.moveTo(pts[0], pts[1]);
+            curves.quadTo(pts[2], pts[3],
+                          pts[4], pts[5]);
+
+            hulls.moveTo(pts[0], pts[1]);
+            hulls.lineTo(pts[2], pts[3]);
+            hulls.lineTo(pts[4], pts[5]);
+
+            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
+            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
+            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
+        }
+        for (int i = 0; i < 100; ++i) {
+            SkScalar pts[] = {
+                rand.nextUScalar1(), rand.nextUScalar1(),
+                rand.nextUScalar1(), rand.nextUScalar1(),
+            };
+            curves.moveTo(pts[0], pts[1]);
+            curves.lineTo(pts[2], pts[3]);
+
+            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
+            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
+        }
+
+        paint.setColor(SK_ColorBLACK);
+        canvas->drawPath(curves, paint);
+        paint.setColor(SK_ColorRED);
+        //canvas->drawPath(hulls, paint);
+        paint.setStyle(SkPaint::kFill_Style);
+        paint.setColor(SK_ColorBLUE);
+        //canvas->drawPath(ctrlPts, paint);
+
+        canvas->restore();
+    }
+
+private:
+    typedef SampleView INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static SkView* MyFactory() { return new HairCurvesView; }
+static SkViewRegister reg(MyFactory);
+