add decal tilemode to shaders

Plenty more to follow-up:
- gradients
- gpu impl

Bug: skia:7638
Change-Id: I8e54fd0e24921f040f178c793b36c7fb855b136e
Reviewed-on: https://skia-review.googlesource.com/107420
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/include/core/SkShader.h b/include/core/SkShader.h
index a5ba12ec2f..58d9ca8da0 100644
--- a/include/core/SkShader.h
+++ b/include/core/SkShader.h
@@ -53,14 +53,17 @@ public:
          */
         kMirror_TileMode,
 
-#if 0
-        /** only draw within the original domain, return 0 everywhere else */
+        /**
+         *  Only draw within the original domain, return transparent-black everywhere else.
+         *  EXPERIMENTAL -- DO NOT USE YET
+         */
         kDecal_TileMode,
-#endif
+
+        kLast_TileMode = kDecal_TileMode
     };
 
     enum {
-        kTileModeCount = kMirror_TileMode + 1
+        kTileModeCount = kLast_TileMode + 1
     };
 
     /**