Fix transparent ambient shadows

Add a clamp value to indicate the percentage of the blurWidth to apply.

Change-Id: I962dc57ed786fa67ed1606b1148f1b2c568025e5
Reviewed-on: https://skia-review.googlesource.com/16424
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gpu/GrRenderTargetContext.h b/src/gpu/GrRenderTargetContext.h
index b3ff137919..5aef96a65b 100644
--- a/src/gpu/GrRenderTargetContext.h
+++ b/src/gpu/GrRenderTargetContext.h
@@ -161,13 +161,15 @@ public:
      * @param blurWidth    amount of shadow blur to apply (in device space)
      * @param insetWidth   minimum amount to inset from the rrect edge (in local space).
      *                     We may inset more depending on the blur radius and geometry.
+     * @param blurClamp    Optional parameter used to indicate fraction of blur to actually apply
      */
     void drawShadowRRect(const GrClip&,
                          GrPaint&&,
                          const SkMatrix& viewMatrix,
                          const SkRRect& rrect,
                          SkScalar blurRadius,
-                         SkScalar insetWidth);
+                         SkScalar insetWidth,
+                         SkScalar blurClamp = 1);
 
     /**
      * Shortcut for filling a SkPath consisting of nested rrects using a paint. The result is