Cache ambient and spot shadows at a canonical position

Change-Id: I1f80931513f7d2268b358fb38c86dd331f32f064
Reviewed-on: https://skia-review.googlesource.com/17394
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/samplecode/SampleShadowUtils.cpp b/samplecode/SampleShadowUtils.cpp
index e592f97b64..8d8a0aeaf6 100755
--- a/samplecode/SampleShadowUtils.cpp
+++ b/samplecode/SampleShadowUtils.cpp
@@ -154,10 +154,7 @@ protected:
         static constexpr SkScalar kHeight = 50.f;
         static constexpr SkScalar kAmbientAlpha = 0.5f;
         static constexpr SkScalar kSpotAlpha = 0.5f;
-
-        // transform light position relative to canvas to handle tiling
-        SkPoint lightXY = canvas->getTotalMatrix().mapXY(250, 400);
-        SkPoint3 lightPos = { lightXY.fX, lightXY.fY, 500 };
+        static constexpr SkPoint3 lightPos = { 250, 400, 500 };
 
         canvas->translate(3 * kPad, 3 * kPad);
         canvas->save();