Correct sRGB <-> linear everywhere.

tests/SkBlend_optsTest.cpp

Index: tests/SkBlend_optsTest.cpp
diff --git a/tests/SkBlend_optsTest.cpp b/tests/SkBlend_optsTest.cpp
index 7665a2d5dedd6811ed2baa5ea67921b9ef083c95..1b29e4228d46aacb26a6d6604a70a96cd5113927 100644
--- a/tests/SkBlend_optsTest.cpp
+++ b/tests/SkBlend_optsTest.cpp
@@ -19,13 +19,25 @@
 
 typedef void (*Blender)(uint32_t* dst, const uint32_t* const srcStart, int ndst, const int nsrc);
 
+static inline void srcover_srgb_srgb_1(uint32_t* dst, uint32_t src) {
+    // TODO: switch back to pure brute force if we can get Sk4f_toS32(Sk4f_fromS32(...)) to
+    // roundtrip perfectly.
+    if (src >= 0xFF000000) {
+        *dst = src;
+        return;
+    }
+    auto d = Sk4f_fromS32(*dst),
+         s = Sk4f_fromS32( src);
+    *dst = Sk4f_toS32(s + d * (1.0f - s[3]));
+}
+
 static void brute_force_srcover_srgb_srgb(
     uint32_t* dst, const uint32_t* const src, int ndst, const int nsrc) {
     while (ndst > 0) {
         int n = SkTMin(ndst, nsrc);
 
         for (int i = 0; i < n; i++) {
-            srcover_blend_srgb8888_srgb_1(dst++, srgb_to_linear(to_4f(src[i])));
+            srcover_srgb_srgb_1(dst++, src[i]);
         }
         ndst -= n;
     }