"Modularize" SkSG

* relocate all SkSG-related files under modules/sksg/
* fix various tidbits to make non-sksg builds possible
* drop obsolete SampleSGInval.cpp

Change-Id: I54e6c5bb1a09f45030fa8d607b3eb3f7cba78957
Reviewed-on: https://skia-review.googlesource.com/130025
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Klein <mtklein@google.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/modules/sksg/include/SkSGGroup.h b/modules/sksg/include/SkSGGroup.h
new file mode 100644
index 0000000000..482f10db8c
--- /dev/null
+++ b/modules/sksg/include/SkSGGroup.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkSGGroup_DEFINED
+#define SkSGGroup_DEFINED
+
+#include "SkSGRenderNode.h"
+
+#include "SkTArray.h"
+
+namespace sksg {
+
+/**
+ * Concrete node, grouping together multiple descendants.
+ */
+class Group : public RenderNode {
+public:
+    static sk_sp<Group> Make() {
+        return sk_sp<Group>(new Group());
+    }
+
+    void addChild(sk_sp<RenderNode>);
+    void removeChild(const sk_sp<RenderNode>&);
+
+    size_t size() const { return SkTo<size_t>(fChildren.count()); }
+    bool  empty() const { return fChildren.empty(); }
+
+protected:
+    Group();
+    ~Group() override;
+
+    void onRender(SkCanvas*) const override;
+    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
+
+private:
+    SkTArray<sk_sp<RenderNode>, true> fChildren;
+
+    typedef RenderNode INHERITED;
+};
+
+} // namespace sksg
+
+#endif // SkSGGroup_DEFINED