Pre-cache local matrix type in shader constructor.

TSAN points out we race when choosing our blitter without this.

BUG=437511

Review URL: https://codereview.chromium.org/773563002

diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index 816d6fd..9c2fc2f 100644 (file)
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -44,6 +44,8 @@ SkShader::SkShader(const SkMatrix* localMatrix) {
     } else {
         fLocalMatrix.reset();
     }
+    // Pre-cache so future calls to fLocalMatrix.getType() are threadsafe.
+    (void)fLocalMatrix.getType();
 }
 
 SkShader::~SkShader() {