Refactor some image traits a bit

- Use `Size<u32>` were applicable.
- Rename `TextureStore` to `image::Storage`.
- Rename `TextureStoreEntry` to `image::storage::Entry`.
- Wire up `viewport_dimensions` to `iced_glow` for `Svg`.

wgpu/src/image/atlas.rs

@@ -4,9 +4,6 @@ mod allocation;
 mod allocator;
 mod layer;
 
-use iced_graphics::image::TextureStore;
-use std::num::NonZeroU32;
-
 pub use allocation::Allocation;
 pub use entry::Entry;
 pub use layer::Layer;
@@ -15,6 +12,11 @@ use allocator::Allocator;
 
 pub const SIZE: u32 = 2048;
 
+use iced_graphics::image;
+use iced_graphics::Size;
+
+use std::num::NonZeroU32;
+
 #[derive(Debug)]
 pub struct Atlas {
     texture: wgpu::Texture,
@@ -112,7 +114,7 @@ impl Atlas {
             }
 
             return Some(Entry::Fragmented {
-                size: (width, height),
+                size: Size::new(width, height),
                 fragments,
             });
         }
@@ -192,7 +194,7 @@ impl Atlas {
         encoder: &mut wgpu::CommandEncoder,
     ) {
         let (x, y) = allocation.position();
-        let (width, height) = allocation.size();
+        let Size { width, height } = allocation.size();
         let layer = allocation.layer();
 
         let extent = wgpu::Extent3d {
@@ -297,7 +299,7 @@ impl Atlas {
     }
 }
 
-impl TextureStore for Atlas {
+impl image::Storage for Atlas {
     type Entry = Entry;
     type State<'a> = (&'a wgpu::Device, &'a mut wgpu::CommandEncoder);