[skottie] Inverted matte support

TBR=

Change-Id: I761d80d27d9a737710123a183af37135c270b8a7
Reviewed-on: https://skia-review.googlesource.com/112162
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/experimental/sksg/effects/SkSGMaskEffect.h b/experimental/sksg/effects/SkSGMaskEffect.h
index aef82b4ef6..c4fd0120e5 100644
--- a/experimental/sksg/effects/SkSGMaskEffect.h
+++ b/experimental/sksg/effects/SkSGMaskEffect.h
@@ -18,23 +18,30 @@ namespace sksg {
  */
 class MaskEffect final : public EffectNode {
 public:
-    static sk_sp<MaskEffect> Make(sk_sp<RenderNode> child, sk_sp<RenderNode> mask) {
+    enum class Mode {
+        kNormal,
+        kInvert
+    };
+
+    static sk_sp<MaskEffect> Make(sk_sp<RenderNode> child, sk_sp<RenderNode> mask,
+                                  Mode mode = Mode::kNormal) {
         return (child && mask)
-            ? sk_sp<MaskEffect>(new MaskEffect(std::move(child), std::move(mask)))
+            ? sk_sp<MaskEffect>(new MaskEffect(std::move(child), std::move(mask), mode))
             : nullptr;
     }
 
     ~MaskEffect() override;
 
 protected:
-    MaskEffect(sk_sp<RenderNode>, sk_sp<RenderNode> mask);
+    MaskEffect(sk_sp<RenderNode>, sk_sp<RenderNode> mask, Mode);
 
     void onRender(SkCanvas*) const override;
 
     SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
 
 private:
-    sk_sp<RenderNode> fMaskNode;
+    const sk_sp<RenderNode> fMaskNode;
+    const Mode              fMaskMode;
 
     typedef EffectNode INHERITED;
 };