[Fix] Make gradient pack fn public for iced_graphics::Gradient

graphics/src/gradient.rs

@@ -23,6 +23,15 @@ impl From<Linear> for Gradient {
     }
 }
 
+impl Gradient {
+    /// Packs the [`Gradient`] for use in shader code.
+    pub fn pack(&self) -> Packed {
+        match self {
+            Gradient::Linear(linear) => linear.pack(),
+        }
+    }
+}
+
 /// A linear gradient that can be used in the style of [`Fill`] or [`Stroke`].
 ///
 /// [`Fill`]: crate::geometry::Fill;
@@ -85,4 +94,35 @@ impl Linear {
 
         self
     }
+
+    /// Packs the [`Gradient`] for use in shader code.
+    pub fn pack(&self) -> Packed {
+        let mut data: [f32; 44] = [0.0; 44];
+
+        for (index, stop) in self.stops.iter().enumerate() {
+            let [r, g, b, a] =
+                stop.map_or(Color::default(), |s| s.color).into_linear();
+
+            data[index * 4] = r;
+            data[(index * 4) + 1] = g;
+            data[(index * 4) + 2] = b;
+            data[(index * 4) + 3] = a;
+
+            data[32 + index] = stop.map_or(2.0, |s| s.offset);
+        }
+
+        data[40] = self.start.x;
+        data[41] = self.start.y;
+        data[42] = self.end.x;
+        data[43] = self.end.y;
+
+        Packed { data }
+    }
+}
+
+/// Packed [`Gradient`] data for use in shader code.
+#[derive(Debug)]
+pub struct Packed {
+    /// The packed [`Gradient`] data.
+    pub data: [f32; 44],
 }

wgpu/src/geometry.rs

@@ -7,6 +7,7 @@ use crate::graphics::geometry::{
 use crate::graphics::primitive::{self, Primitive};
 use crate::graphics::Gradient;
 
+use iced_graphics::gradient;
 use lyon::geom::euclid;
 use lyon::tessellation;
 use std::borrow::Cow;
@@ -74,7 +75,7 @@ impl BufferStack {
                 Box::new(tessellation::BuffersBuilder::new(
                     buffer,
                     GradientVertex2DBuilder {
-                        gradient: pack_gradient(gradient),
+                        gradient: gradient.pack(),
                     },
                 ))
             }
@@ -97,7 +98,7 @@ impl BufferStack {
                 Box::new(tessellation::BuffersBuilder::new(
                     buffer,
                     GradientVertex2DBuilder {
-                        gradient: pack_gradient(gradient),
+                        gradient: gradient.pack(),
                     },
                 ))
             }
@@ -490,7 +491,7 @@ impl Frame {
 }
 
 struct GradientVertex2DBuilder {
-    gradient: [f32; 44],
+    gradient: gradient::Packed,
 }
 
 impl tessellation::FillVertexConstructor<primitive::GradientVertex2D>
@@ -504,7 +505,7 @@ impl tessellation::FillVertexConstructor<primitive::GradientVertex2D>
 
         primitive::GradientVertex2D {
             position: [position.x, position.y],
-            gradient: self.gradient,
+            gradient: self.gradient.data,
         }
     }
 }
@@ -520,7 +521,7 @@ impl tessellation::StrokeVertexConstructor<primitive::GradientVertex2D>
 
         primitive::GradientVertex2D {
             position: [position.x, position.y],
-            gradient: self.gradient,
+            gradient: self.gradient.data,
         }
     }
 }
@@ -623,42 +624,3 @@ pub(super) fn dashed(path: &Path, line_dash: LineDash<'_>) -> Path {
         );
     })
 }
-
-/// Packs the [`Gradient`] for use in shader code.
-fn pack_gradient(gradient: &Gradient) -> [f32; 44] {
-    match gradient {
-        Gradient::Linear(linear) => {
-            let mut pack: [f32; 44] = [0.0; 44];
-            let mut offsets: [f32; 8] = [2.0; 8];
-
-            for (index, stop) in linear.stops.iter().enumerate() {
-                let [r, g, b, a] = stop
-                    .map_or(crate::core::Color::default(), |s| s.color)
-                    .into_linear();
-
-                pack[index * 4] = r;
-                pack[(index * 4) + 1] = g;
-                pack[(index * 4) + 2] = b;
-                pack[(index * 4) + 3] = a;
-
-                offsets[index] = stop.map_or(2.0, |s| s.offset);
-            }
-
-            pack[32] = offsets[0];
-            pack[33] = offsets[1];
-            pack[34] = offsets[2];
-            pack[35] = offsets[3];
-            pack[36] = offsets[4];
-            pack[37] = offsets[5];
-            pack[38] = offsets[6];
-            pack[39] = offsets[7];
-
-            pack[40] = linear.start.x;
-            pack[41] = linear.start.y;
-            pack[42] = linear.end.x;
-            pack[43] = linear.end.y;
-
-            pack
-        }
-    }
-}