From e9bce02b24f0dc14560189a811e579240a92f0f7 Mon Sep 17 00:00:00 2001
From: Egon Elbre <egonelbre@gmail.com>
Date: Wed, 28 Dec 2022 14:13:15 +0200
Subject: [PATCH] unit: add PxToDp and PxToSp

PxToDp and PxToSp are useful when you are trying to calculate
text-size or widget size based on dynamically sized container.

Signed-off-by: Egon Elbre <egonelbre@gmail.com>
---
 unit/unit.go      | 10 ++++++++++
 unit/unit_test.go | 16 ++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/unit/unit.go b/unit/unit.go
index 58a43903..1cb46d3d 100644
--- a/unit/unit.go
+++ b/unit/unit.go
@@ -60,6 +60,16 @@ func (c Metric) SpToDp(v Sp) Dp {
 	return Dp(float32(v) * nonZero(c.PxPerSp) / nonZero(c.PxPerDp))
 }
 
+// PxToSp converts v px to sp.
+func (c Metric) PxToSp(v int) Sp {
+	return Sp(float32(v) / nonZero(c.PxPerSp))
+}
+
+// PxToDp converts v px to dp.
+func (c Metric) PxToDp(v int) Dp {
+	return Dp(float32(v) / nonZero(c.PxPerDp))
+}
+
 func nonZero(v float32) float32 {
 	if v == 0. {
 		return 1
diff --git a/unit/unit_test.go b/unit/unit_test.go
index 2a9736e9..513ce0e7 100644
--- a/unit/unit_test.go
+++ b/unit/unit_test.go
@@ -29,4 +29,20 @@ func TestMetric_DpToSp(t *testing.T) {
 			t.Errorf("SpToDp conversion mismatch %v != %v", exp, got)
 		}
 	}
+
+	{
+		exp := unit.Dp(5)
+		got := m.PxToDp(m.Dp(5))
+		if got != exp {
+			t.Errorf("PxToDp conversion mismatch %v != %v", exp, got)
+		}
+	}
+
+	{
+		exp := unit.Sp(5)
+		got := m.PxToSp(m.Sp(5))
+		if got != exp {
+			t.Errorf("PxToSp conversion mismatch %v != %v", exp, got)
+		}
+	}
 }