Make SkPMFloats store floats in [0,255] instead of [0,1].

tests/PMFloatTest.cpp

 #include "SkPMFloat.h"
 #include "Test.h"
 
 DEF_TEST(SkPMFloat, r) {
     // Test SkPMColor <-> SkPMFloat
     SkPMColor c = SkPreMultiplyColor(0xFFCC9933);
 
     SkPMFloat pmf;
     pmf.set(c);
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(1.0f, pmf.a()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.8f, pmf.r()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.6f, pmf.g()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.2f, pmf.b()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(255.0f, pmf.a()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(204.0f, pmf.r()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(153.0f, pmf.g()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual( 51.0f, pmf.b()));
 
     REPORTER_ASSERT(r, c == pmf.get());
 
     // Test clamping.
     SkPMFloat unclamped;
-    unclamped.setA(+2.0f);
-    unclamped.setR(+0.2f);
-    unclamped.setG(-0.2f);
-    unclamped.setB(-5.0f);
+    unclamped.setA(+510.0f);
+    unclamped.setR(+153.0f);
+    unclamped.setG(  +1.0f);
+    unclamped.setB(  -0.2f);
 
     SkPMFloat clamped;
     clamped.set(unclamped.clamped());
 
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(1.0f, clamped.a()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.2f, clamped.r()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.0f, clamped.g()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.0f, clamped.b()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(255.0f, clamped.a()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(153.0f, clamped.r()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(  1.0f, clamped.g()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(  0.0f, clamped.b()));
 
     // Test SkPMFloat <-> Sk4f conversion.
     Sk4f fs = clamped;
-    SkPMFloat scaled = fs.multiply(Sk4f(4,4,4,4));
+    SkPMFloat scaled = fs.multiply(0.25f);
 
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(4.0f, scaled.a()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.8f, scaled.r()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.0f, scaled.g()));
-    REPORTER_ASSERT(r, SkScalarNearlyEqual(0.0f, scaled.b()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(63.75f, scaled.a()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual(38.25f, scaled.r()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual( 0.25f, scaled.g()));
+    REPORTER_ASSERT(r, SkScalarNearlyEqual( 0.00f, scaled.b()));
 }