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`.

graphics/src/image.rs

@@ -1,34 +1,10 @@
-//! Image loading and caching
-
-use std::fmt::Debug;
-
+//! Render images.
 #[cfg(feature = "image_rs")]
 pub mod raster;
 
 #[cfg(feature = "svg")]
 pub mod vector;
 
-/// Entry in the texture store
-pub trait TextureStoreEntry: Debug {
-    /// Width and height of the entry
-    fn size(&self) -> (u32, u32);
-}
+pub mod storage;
 
-/// Stores cached image data for use in rendering
-pub trait TextureStore {
-    /// Entry in the texture store
-    type Entry: TextureStoreEntry;
-    /// State passed to upload/remove
-    type State<'a>;
-
-    /// Upload image data
-    fn upload(
-        &mut self,
-        width: u32,
-        height: u32,
-        data: &[u8],
-        state: &mut Self::State<'_>,
-    ) -> Option<Self::Entry>;
-    /// Remome image from store
-    fn remove(&mut self, entry: &Self::Entry, state: &mut Self::State<'_>);
-}
+pub use storage::Storage;