add kRGBA_F16_SkColorType

src/core/SkColor.cpp

Index: src/core/SkColor.cpp
diff --git a/src/core/SkColor.cpp b/src/core/SkColor.cpp
index 87e3a9d60e2f18dfa449bd16f2033036a34ba1d0..c0a3895bbe5ffb4ce4807332aa2029fc7fe4a448 100644
--- a/src/core/SkColor.cpp
+++ b/src/core/SkColor.cpp
@@ -103,6 +103,7 @@ SkColor SkHSVToColor(U8CPU a, const SkScalar hsv[3]) {
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 #include "SkNx.h"
+#include "SkHalf.h"
 
 SkPM4f SkPM4f::FromPMColor(SkPMColor c) {
     Sk4f value = SkNx_cast<float>(Sk4b::Load(&c));
@@ -121,6 +122,36 @@ SkColor4f SkPM4f::unpremul() const {
     }
 }
 
+void SkPM4f::toF16(uint16_t half[4]) const {
+    for (int i = 0; i < 4; ++i) {
+        half[i] = SkFloatToHalf(fVec[i]);
+    }
+}
+
+uint64_t SkPM4f::toF16() const {
+    uint64_t value;
+    this->toF16(reinterpret_cast<uint16_t*>(&value));
+    return value;
+}
+
+SkPM4f SkPM4f::FromF16(const uint16_t half[4]) {
+    return {{
+        SkHalfToFloat(half[0]),
+        SkHalfToFloat(half[1]),
+        SkHalfToFloat(half[2]),
+        SkHalfToFloat(half[3])
+    }};
+}
+
+#ifdef SK_DEBUG
+void SkPM4f::assertIsUnit() const {
+    auto c4 = Sk4f::Load(fVec);
+    SkASSERT((c4 >= Sk4f(0)).allTrue() && (c4 <= Sk4f(1)).allTrue());
+}
+#endif
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
 SkColor4f SkColor4f::FromColor(SkColor c) {
     Sk4f value = SkNx_shuffle<3,2,1,0>(SkNx_cast<float>(Sk4b::Load(&c)));
     SkColor4f c4;
@@ -151,10 +182,3 @@ SkPM4f SkColor4f::premul() const {
     dst.store(&pm4);
     return pm4;
 }
-
-#ifdef SK_DEBUG
-void SkPM4f::assertIsUnit() const {
-    auto c4 = Sk4f::Load(fVec);
-    SkASSERT((c4 >= Sk4f(0)).allTrue() && (c4 <= Sk4f(1)).allTrue());
-}
-#endif