Add MetricType type

src/lib.rs

@@ -36,7 +36,7 @@ use libc::size_t;
 #[cfg(not(target_os = "freebsd"))]
 use libc::ssize_t;
 
-pub use bindings::{ColorspaceType, DitherMethod, FilterType, GravityType, MetricType};
+pub use bindings::{ColorspaceType, DitherMethod, FilterType, GravityType};
 pub use conversions::ToMagick;
 pub use result::MagickError;
 use result::Result;

src/types/metric_type.rs

@@ -0,0 +1,29 @@
+use crate::bindings;
+
+pub enum MetricType {
+    Undefined                  = bindings::MetricType_UndefinedErrorMetric                  as isize,
+    Absolute                   = bindings::MetricType_AbsoluteErrorMetric                   as isize,
+    Fuzz                       = bindings::MetricType_FuzzErrorMetric                       as isize,
+    MeanAbsolute               = bindings::MetricType_MeanAbsoluteErrorMetric               as isize,
+    MeanErrorPerPixel          = bindings::MetricType_MeanErrorPerPixelErrorMetric          as isize,
+    MeanSquared                = bindings::MetricType_MeanSquaredErrorMetric                as isize,
+    NormalizedCrossCorrelation = bindings::MetricType_NormalizedCrossCorrelationErrorMetric as isize,
+    PeakAbsolute               = bindings::MetricType_PeakAbsoluteErrorMetric               as isize,
+    PeakSignalToNoiseRatio     = bindings::MetricType_PeakSignalToNoiseRatioErrorMetric     as isize,
+    PerceptualHash             = bindings::MetricType_PerceptualHashErrorMetric             as isize,
+    RootMeanSquared            = bindings::MetricType_RootMeanSquaredErrorMetric            as isize,
+    StructuralSimilarity       = bindings::MetricType_StructuralSimilarityErrorMetric       as isize,
+    StructuralDissimilarity    = bindings::MetricType_StructuralDissimilarityErrorMetric    as isize,
+}
+
+impl Default for MetricType {
+    fn default() -> Self {
+        return MetricType::Absolute;
+    }
+}
+
+impl From<MetricType> for bindings::MetricType {
+    fn from(value: MetricType) -> Self {
+        return value as bindings::MetricType;
+    }
+}

src/wand/magick.rs

@@ -29,7 +29,7 @@ use {size_t, ssize_t};
 use crate::result::Result;
 
 use super::{DrawingWand, PixelWand};
-use crate::{CompositeOperator, ResourceType};
+use crate::{CompositeOperator, MetricType, ResourceType};
 
 wand_common!(
     MagickWand,
@@ -202,11 +202,11 @@ impl MagickWand {
     pub fn compare_images(
         &self,
         reference: &MagickWand,
-        metric: bindings::MetricType,
+        metric: MetricType,
     ) -> (f64, Option<MagickWand>) {
         let mut distortion: f64 = 0.0;
         let result = unsafe {
-            bindings::MagickCompareImages(self.wand, reference.wand, metric, &mut distortion)
+            bindings::MagickCompareImages(self.wand, reference.wand, metric.into(), &mut distortion)
         };
         let wand = if result.is_null() {
             None