SkFloatConvert

src/core/SkXfermodeU64.cpp

Index: src/core/SkXfermodeU64.cpp
diff --git a/src/core/SkXfermodeU64.cpp b/src/core/SkXfermodeU64.cpp
index 630a9d068351f103f22a8d9ccb3770bd18a125eb..eaaa2656f0d2db1a00f71a9f6a7d61bc8caec64e 100644
--- a/src/core/SkXfermodeU64.cpp
+++ b/src/core/SkXfermodeU64.cpp
@@ -211,6 +211,20 @@ template <DstType D> void srcover_n(const SkXfermode*, uint64_t dst[],
     }
 }
 
+template <> void srcover_n<kF16_Dst>(const SkXfermode*, uint64_t dst[],
+                                     const SkPM4f src[], int count, const SkAlpha aa[]) {
+    SkFloatConvert fc;
+    for (int i = 0; i < count; ++i) {
+        Sk4f s = Sk4f::Load(src+i),
+             d = fc.halfToFloat(dst[i]),
+             r = s + d * (1.0f - SkNx_shuffle<3,3,3,3>(s));
+        if (aa) {
+            r = lerp_by_coverage(r, d, aa[i]);
+        }
+        dst[i] = fc.floatToHalf(r);
+    }
+}
+
 const SkXfermode::D64Proc gProcs_SrcOver[] = {
     srcover_n<kU16_Dst>,    src_n<kU16_Dst>,
     srcover_1<kU16_Dst>,    src_1<kU16_Dst>,