Fix a couple float-cast-overflow in SkScan*.

Bug: skia:5060
Change-Id: I60a48993c77631aaad9354bb86b13204dc618bf4
Reviewed-on: https://skia-review.googlesource.com/47422
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/core/SkRect.h b/include/core/SkRect.h
index 2cc2604941..12afddd9ce 100644
--- a/include/core/SkRect.h
+++ b/include/core/SkRect.h
@@ -411,6 +411,14 @@ struct SK_API SkRect {
         return r;
     }
 
+    // The largest SkRect for which round() is well-defined.
+    static SkRect SK_WARN_UNUSED_RESULT MakeLargestS32() {
+        const SkRect r = MakeLTRB(SK_MinS32FitsInFloat, SK_MinS32FitsInFloat,
+                                  SK_MaxS32FitsInFloat, SK_MaxS32FitsInFloat);
+        SkASSERT(r == Make(r.roundOut()));
+        return r;
+    }
+
     static constexpr SkRect SK_WARN_UNUSED_RESULT MakeWH(SkScalar w, SkScalar h) {
         return SkRect{0, 0, w, h};
     }