Invalidate textures cached by SW path renderer when paths go away

Bug: skia:
Change-Id: Icfc2f1bd57c0cf7be54469b6d86cbd436b59155d
Reviewed-on: https://skia-review.googlesource.com/51201
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/gpu/GrSoftwarePathRenderer.cpp b/src/gpu/GrSoftwarePathRenderer.cpp
index 8b509082c8..9f876f1213 100644
--- a/src/gpu/GrSoftwarePathRenderer.cpp
+++ b/src/gpu/GrSoftwarePathRenderer.cpp
@@ -200,6 +200,18 @@ private:
     GrAA fAA;
 };
 
+// When the SkPathRef genID changes, invalidate a corresponding GrResource described by key.
+class PathInvalidator : public SkPathRef::GenIDChangeListener {
+public:
+    explicit PathInvalidator(const GrUniqueKey& key) : fMsg(key) {}
+private:
+    GrUniqueKeyInvalidatedMessage fMsg;
+
+    void onChange() override {
+        SkMessageBus<GrUniqueKeyInvalidatedMessage>::Post(fMsg);
+    }
+};
+
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -344,6 +356,7 @@ bool GrSoftwarePathRenderer::onDrawPath(const DrawPathArgs& args) {
         if (useCache) {
             SkASSERT(proxy->origin() == kTopLeft_GrSurfaceOrigin);
             fResourceProvider->assignUniqueKeyToProxy(maskKey, proxy.get());
+            args.fShape->addGenIDChangeListener(new PathInvalidator(maskKey));
         }
     }
     if (inverseFilled) {