Made shadows blurry (thru implementing variance mapping)

src/utils/SkShadowPaintFilterCanvas.cpp

Index: src/utils/SkShadowPaintFilterCanvas.cpp
diff --git a/src/utils/SkShadowPaintFilterCanvas.cpp b/src/utils/SkShadowPaintFilterCanvas.cpp
index 31b7661296151023a8266cf67d5d74468b181dc5..27f04dd5dfadd8ca8cf61b5b8927d77eae4f48a2 100644
--- a/src/utils/SkShadowPaintFilterCanvas.cpp
+++ b/src/utils/SkShadowPaintFilterCanvas.cpp
@@ -24,6 +24,14 @@ bool SkShadowPaintFilterCanvas::onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Ty
 
         SkColor color = 0xFF000000; // init color to opaque black
         color |= z; // Put the index into the blue component
+

[robertphillips, 2016/08/10 14:23:18]

parameterize & comment

[vjiaoblack, 2016/08/11 18:28:51]

Done.

+        int z2 = z * z;
+        if (z2 > 255 * 256) {
+            color |= (255) << 8;
+        } else {
+            color |= (z2 / 256) << 8;
+        }
+//        color |= (z * z / 256) << 8;
         newPaint.setColor(color);
 
         *paint->writable() = newPaint;