From 5c5015a10ebf0d46c93e560bb5407c2357d33504 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20R=C3=B6nnkvist?= <daniel.ronnkvist@storykit.io>
Date: Wed, 25 Mar 2020 15:57:10 +0100
Subject: [PATCH 1/3] Bindings for MagickLevelImage

---
 src/wand/magick.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/wand/magick.rs b/src/wand/magick.rs
index f710a07..25b579e 100644
--- a/src/wand/magick.rs
+++ b/src/wand/magick.rs
@@ -251,6 +251,20 @@ impl MagickWand {
         }
     }
 
+    pub fn level_image(
+        &self,
+        black_point: f64,
+        gamma: f64,
+        white_point: f64,
+    ) -> Result<(), &'static str> {
+        let result =
+            unsafe { bindings::MagickLevelImage(self.wand, black_point, gamma, white_point) };
+        match result {
+            bindings::MagickBooleanType_MagickTrue => Ok(()),
+            _ => Err("failed to set size of wand"),
+        }
+    }
+
     /// Extend the image as defined by the geometry, gravity, and wand background color. Set the
     /// (x,y) offset of the geometry to move the original wand relative to the extended wand.
     pub fn extend_image(

From 36c145d4c48e3966f8c6f9272a9147e0c4c736e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20R=C3=B6nnkvist?= <daniel.ronnkvist@storykit.io>
Date: Thu, 26 Mar 2020 10:13:54 +0100
Subject: [PATCH 2/3] fix: black and white point should be set relative to
 quantum range

---
 src/wand/magick.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/wand/magick.rs b/src/wand/magick.rs
index 25b579e..8475bc5 100644
--- a/src/wand/magick.rs
+++ b/src/wand/magick.rs
@@ -257,8 +257,14 @@ impl MagickWand {
         gamma: f64,
         white_point: f64,
     ) -> Result<(), &'static str> {
-        let result =
-            unsafe { bindings::MagickLevelImage(self.wand, black_point, gamma, white_point) };
+        let result = unsafe {
+            bindings::MagickLevelImage(
+                self.wand,
+                black_point * bindings::QuantumRange,
+                gamma,
+                white_point * bindings::QuantumRange,
+            )
+        };
         match result {
             bindings::MagickBooleanType_MagickTrue => Ok(()),
             _ => Err("failed to set size of wand"),

From fa563b8fb611e1e9755b1a28f444bed00dca4744 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20R=C3=B6nnkvist?= <daniel.ronnkvist@storykit.io>
Date: Tue, 21 Apr 2020 09:09:59 +0200
Subject: [PATCH 3/3] docs: describe the quantomrange use in level_image

---
 src/wand/magick.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/wand/magick.rs b/src/wand/magick.rs
index 8475bc5..c298824 100644
--- a/src/wand/magick.rs
+++ b/src/wand/magick.rs
@@ -251,6 +251,8 @@ impl MagickWand {
         }
     }
 
+    // Level an image. Black and white points are multiplied with QuantumRange to
+    // decrease dependencies on the end user.
     pub fn level_image(
         &self,
         black_point: f64,