[skottie] Add support for inverse mask paths

TBR=
Change-Id: I442033b2e82777c90ee497d8a5b2310af1d2e631
Reviewed-on: https://skia-review.googlesource.com/123840
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

4 files changed, 21 insertions, 9 deletions

diff --git a/experimental/skottie/Skottie.cpp b/experimental/skottie/Skottie.cpp
index 7486502f2e..194efe70c4 100644
--- a/experimental/skottie/Skottie.cpp
+++ b/experimental/skottie/Skottie.cpp
@@ -949,19 +949,16 @@ sk_sp<sksg::RenderNode> AttachMask(const Json::Value& jmask,
         if (!m.isObject())
             continue;
 
-        const auto inverted = ParseDefault(m["inv"], false);
-        // TODO
-        if (inverted) {
-            LogFail(m, "Unsupported inverse mask");
-            continue;
-        }
-
         auto mask_path = AttachPath(m["pt"], ctx);
         if (!mask_path) {
             LogFail(m, "Could not parse mask path");
             continue;
         }
 
+        mask_path->setFillType(ParseDefault(m["inv"], false)
+            ? SkPath::kInverseWinding_FillType
+            : SkPath::kWinding_FillType);
+
         SkString mode;
         if (!Parse(m["mode"], &mode) ||
             mode.size() != 1 ||
diff --git a/experimental/sksg/SkSGNode.h b/experimental/sksg/SkSGNode.h
index 6396e4d33e..17619de485 100644
--- a/experimental/sksg/SkSGNode.h
+++ b/experimental/sksg/SkSGNode.h
@@ -92,7 +92,15 @@ private:
         if (attr_container == v) return;                               \
         attr_container = v;                                            \
         this->invalidate();                                            \
-   }
+    }
+
+#define SG_MAPPED_ATTRIBUTE(attr_name, attr_type, attr_container)                \
+    attr_type get##attr_name() const { return attr_container.get##attr_name(); } \
+    void set##attr_name(const attr_type& v) {                                    \
+        if (attr_container.get##attr_name() == v) return;                        \
+        attr_container.set##attr_name(v);                                        \
+        this->invalidate();                                                      \
+    }
 
 } // namespace sksg
 
diff --git a/experimental/sksg/geometry/SkSGPath.cpp b/experimental/sksg/geometry/SkSGPath.cpp
index 8d5a25373a..230442d409 100644
--- a/experimental/sksg/geometry/SkSGPath.cpp
+++ b/experimental/sksg/geometry/SkSGPath.cpp
@@ -9,6 +9,7 @@
 
 #include "SkCanvas.h"
 #include "SkPaint.h"
+#include "SkRectPriv.h"
 
 namespace sksg {
 
@@ -25,7 +26,12 @@ void Path::onDraw(SkCanvas* canvas, const SkPaint& paint) const {
 SkRect Path::onRevalidate(InvalidationController*, const SkMatrix&) {
     SkASSERT(this->hasInval());
 
-    return fPath.computeTightBounds();
+    const auto ft = fPath.getFillType();
+    return (ft == SkPath::kWinding_FillType || ft == SkPath::kEvenOdd_FillType)
+        // "Containing" fills have finite bounds.
+        ? fPath.computeTightBounds()
+        // Inverse fills are "infinite".
+        : SkRectPriv::MakeLargeS32();
 }
 
 SkPath Path::onAsPath() const {
diff --git a/experimental/sksg/geometry/SkSGPath.h b/experimental/sksg/geometry/SkSGPath.h
index a398e2f0a4..1a8718868d 100644
--- a/experimental/sksg/geometry/SkSGPath.h
+++ b/experimental/sksg/geometry/SkSGPath.h
@@ -26,6 +26,7 @@ public:
     static sk_sp<Path> Make(const SkPath& r) { return sk_sp<Path>(new Path(r)); }
 
     SG_ATTRIBUTE(Path, SkPath, fPath)
+    SG_MAPPED_ATTRIBUTE(FillType, SkPath::FillType, fPath)
 
 protected:
     void onClip(SkCanvas*, bool antiAlias) const override;