style: unit conversion

Implemented the golang.org/x/exp/shiny/unit.Converter interface on
style.Style.

1 files changed, 74 insertions, 0 deletions

diff --git a/style/fixed_test.go b/style/fixed_test.go
new file mode 100644
index 0000000..5cae4bf
--- /dev/null
+++ b/style/fixed_test.go
@@ -0,0 +1,74 @@
+package style
+
+import (
+	"testing"
+
+	"golang.org/x/image/math/fixed"
+)
+
+func TestFixed26ToFloat(t *testing.T) {
+	t.Parallel()
+
+	var (
+		in        fixed.Int26_6
+		out, want float64
+	)
+
+	in = 0
+	out = fixed26ToFloat(in)
+	want = 0
+	if out != want {
+		t.Errorf("float(%#v) = %v; want %v", in, out, want)
+	}
+
+	in = fixed.I(123)
+	out = fixed26ToFloat(in)
+	want = 123
+	if out != want {
+		t.Errorf("float(%#v) = %v; want %v", in, out, want)
+	}
+
+	in = fixed.I(-123)
+	out = fixed26ToFloat(in)
+	want = -123
+	if out != want {
+		t.Errorf("float(%#v) = %v; want %v", in, out, want)
+	}
+
+	in = fixed.Int26_6(1<<6 + 1<<4)
+	out = fixed26ToFloat(in)
+	want = 1.25
+	if out != want {
+		t.Errorf("float(%#v) = %v; want %v", in, out, want)
+	}
+}
+
+func TestFloatToFixed26(t *testing.T) {
+	t.Parallel()
+
+	var (
+		in        float64
+		out, want fixed.Int26_6
+	)
+
+	in = 0
+	out = floatToFixed26(in)
+	want = 0
+	if out != want {
+		t.Errorf("fixed(%#v) = %v; want %v", in, out, want)
+	}
+
+	in = 1.25
+	out = floatToFixed26(in)
+	want = fixed.Int26_6(1<<6 + 1<<4)
+	if out != want {
+		t.Errorf("fixed(%#v) = %v; want %v", in, out, want)
+	}
+
+	in = -1.25
+	out = floatToFixed26(in)
+	want = -fixed.Int26_6(1<<6 + 1<<4)
+	if out != want {
+		t.Errorf("fixed(%#v) = %v; want %v", in, out, want)
+	}
+}