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, c == pmf.get());

    // Test clamping.
    SkPMFloat unclamped;
    unclamped.setA(+2.0f);
    unclamped.setR(+0.2f);
    unclamped.setG(-0.2f);
    unclamped.setB(-5.0f);

    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()));

    // Test SkPMFloat <-> Sk4f conversion.
    Sk4f fs = clamped;
    SkPMFloat scaled = fs.multiply(Sk4f(4,4,4,4));

    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()));
}