Add AutoThresholdMethod type

src/types/auto_threshold_method.rs

@@ -0,0 +1,22 @@
+use crate::bindings;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u32)]
+pub enum AutoThresholdMethod {
+    Undefined = bindings::AutoThresholdMethod_UndefinedThresholdMethod,
+    Kapur     = bindings::AutoThresholdMethod_KapurThresholdMethod,
+    OTSU      = bindings::AutoThresholdMethod_OTSUThresholdMethod,
+    Triangle  = bindings::AutoThresholdMethod_TriangleThresholdMethod,
+}
+
+impl Default for AutoThresholdMethod {
+    fn default() -> Self {
+        return AutoThresholdMethod::Undefined;
+    }
+}
+
+impl From<AutoThresholdMethod> for bindings::AutoThresholdMethod {
+    fn from(value: AutoThresholdMethod) -> Self {
+        return value as bindings::AutoThresholdMethod;
+    }
+}

src/types/mod.rs

@@ -1,5 +1,6 @@
 mod align_type;
 mod alpha_channel_option;
+mod auto_threshold_method;
 mod clip_path_units;
 mod colorspace_type;
 mod composite_operator;
@@ -29,6 +30,7 @@ mod style_type;
 
 pub use self::align_type::AlignType;
 pub use self::alpha_channel_option::AlphaChannelOption;
+pub use self::auto_threshold_method::AutoThresholdMethod;
 pub use self::clip_path_units::ClipPathUnits;
 pub use self::colorspace_type::ColorspaceType;
 pub use self::composite_operator::CompositeOperator;

src/wand/magick.rs

@@ -32,6 +32,7 @@ use super::{MagickTrue, MagickFalse};
 use super::{DrawingWand, PixelWand};
 use crate::{
     AlphaChannelOption,
+    AutoThresholdMethod,
     ColorspaceType,
     CompositeOperator,
     CompressionType,
@@ -1286,8 +1287,8 @@ impl MagickWand {
     /// down to a binary black & white image. Included algorithms are
     /// Kapur, Otsu, and Triangle methods.
     /// See <https://imagemagick.org/api/magick-image.php#MagickAutoThresholdImage> for more information.
-    pub fn auto_threshold(&self, method: bindings::AutoThresholdMethod) -> Result<()> {
-        match unsafe { bindings::MagickAutoThresholdImage(self.wand, method) } {
+    pub fn auto_threshold(&self, method: AutoThresholdMethod) -> Result<()> {
+        match unsafe { bindings::MagickAutoThresholdImage(self.wand, method.into()) } {
             MagickTrue => Ok(()),
             _ => Err(MagickError("unable to auto threshold image")),
         }