Inverse fill support in PDF

gm/inversestrokefill.cpp

Index: gm/inversestrokefill.cpp
diff --git a/gm/inversestrokefill.cpp b/gm/inversestrokefill.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..842cbd6fa81e58ee68a1c7dbf44128e6ab9c1d09
--- /dev/null
+++ b/gm/inversestrokefill.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "SkCanvas.h"
+#include "SkPath.h"
+
+namespace skiagm {
+
+class InverseStrokeFillGM : public GM {
+public:
+    InverseStrokeFillGM() {
+
+    }
+
+protected:
+    virtual SkString onShortName() {
+        return SkString("inverse_stroke_fill");
+    }
+
+    virtual SkISize onISize() {
+        return make_isize(100, 100);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        SkScalar x = SkIntToScalar(50);
+        SkScalar y = SkIntToScalar(50);
+        SkScalar r = SkIntToScalar(40);
+
+        SkPaint paint;
+        paint.setStrokeWidth(SkIntToScalar(5));

[edisonn, 2013/07/26 20:23:52]

add option for stoke width 0

[ducky, 2013/07/29 19:07:51]

Done. The original intent of this GM was to test only combination stroke and
fill operations (where the stroke is bigger than the shape) as many other cases
are implicitly tested in other GMs like cubicpaths. I've changed this to a
comprehensive inverse paths GM now, and added some corner case tests.

+        paint.setStyle(SkPaint::kStrokeAndFill_Style);

[edisonn, 2013/07/26 20:23:52]

what about the rest of styles?

[ducky, 2013/07/29 19:07:51]

Done.

+
+        SkPath path;
+        path.setFillType(SkPath::kInverseWinding_FillType);
+        path.addCircle(x, y, r, SkPath::kCW_Direction);
+        canvas->drawPath(path, paint);

[edisonn, 2013/07/26 20:23:52]

please add tests for other addFoo operations. some of them take shurtcuts, that
might expose bugs (drawRect, draw empty rect, draw rect as line, draw... )

[ducky, 2013/07/29 19:07:51]

Done.

+
+        // Draw positive centerline for reference.
+        paint.setStrokeWidth(SkIntToScalar(0));
+        paint.setStyle(SkPaint::kStroke_Style);
+        path.setFillType(SkPath::kWinding_FillType);
+        canvas->drawPath(path, paint);
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+DEF_GM( return new InverseStrokeFillGM; )
+}