[sksg] Add 'plane' geometry node

SG geometry corresponding to SkCanvas::drawPaint().

TBR=

Change-Id: I3b368adda187fb92f524756496a3694c03a3113d
Reviewed-on: https://skia-review.googlesource.com/108562
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

2 files changed, 76 insertions, 0 deletions

diff --git a/experimental/sksg/geometry/SkSGPlane.cpp b/experimental/sksg/geometry/SkSGPlane.cpp
new file mode 100644
index 0000000000..806fcc7d29
--- /dev/null
+++ b/experimental/sksg/geometry/SkSGPlane.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkSGPlane.h"
+
+#include "SkCanvas.h"
+#include "SkPath.h"
+
+namespace sksg {
+
+Plane::Plane() = default;
+
+void Plane::onClip(SkCanvas*, bool) const {}
+
+void Plane::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
+    canvas->drawPaint(paint);
+}
+
+SkRect Plane::onRevalidate(InvalidationController*, const SkMatrix&) {
+    SkASSERT(this->hasInval());
+
+    return SkRect::MakeLTRB(SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax);
+}
+
+SkPath Plane::onAsPath() const {
+    SkPath path;
+    path.setFillType(SkPath::kInverseWinding_FillType);
+
+    return path;
+}
+
+} // namespace sksg
diff --git a/experimental/sksg/geometry/SkSGPlane.h b/experimental/sksg/geometry/SkSGPlane.h
new file mode 100644
index 0000000000..c0a26375b2
--- /dev/null
+++ b/experimental/sksg/geometry/SkSGPlane.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSGPlane_DEFINED
+#define SkSGPlane_DEFINED
+
+#include "SkSGGeometryNode.h"
+
+class SkCanvas;
+class SkPaint;
+
+namespace sksg {
+
+/**
+ * Concrete Geometry node, representing the whole canvas.
+ */
+class Plane final : public GeometryNode {
+public:
+    static sk_sp<Plane> Make() { return sk_sp<Plane>(new Plane()); }
+
+protected:
+    void onClip(SkCanvas*, bool antiAlias) const override;
+    void onDraw(SkCanvas*, const SkPaint&) const override;
+
+    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
+    SkPath onAsPath() const override;
+
+private:
+    Plane();
+
+    using INHERITED = GeometryNode;
+};
+
+} // namespace sksg
+
+#endif // SkSGPlane_DEFINED