Create `iced_widget` subcrate and re-organize the whole codebase

1 files changed, 174 insertions, 0 deletions

diff --git a/core/src/image.rs b/core/src/image.rs
new file mode 100644
index 00000000..70fbade0
--- /dev/null
+++ b/core/src/image.rs
@@ -0,0 +1,174 @@
+//! Load and draw raster graphics.
+use crate::{Hasher, Rectangle, Size};
+
+use std::hash::{Hash, Hasher as _};
+use std::path::PathBuf;
+use std::sync::Arc;
+
+/// A handle of some image data.
+#[derive(Debug, Clone)]
+pub struct Handle {
+    id: u64,
+    data: Data,
+}
+
+impl Handle {
+    /// Creates an image [`Handle`] pointing to the image of the given path.
+    ///
+    /// Makes an educated guess about the image format by examining the data in the file.
+    pub fn from_path<T: Into<PathBuf>>(path: T) -> Handle {
+        Self::from_data(Data::Path(path.into()))
+    }
+
+    /// Creates an image [`Handle`] containing the image pixels directly. This
+    /// function expects the input data to be provided as a `Vec<u8>` of RGBA
+    /// pixels.
+    ///
+    /// This is useful if you have already decoded your image.
+    pub fn from_pixels(
+        width: u32,
+        height: u32,
+        pixels: impl AsRef<[u8]> + Send + Sync + 'static,
+    ) -> Handle {
+        Self::from_data(Data::Rgba {
+            width,
+            height,
+            pixels: Bytes::new(pixels),
+        })
+    }
+
+    /// Creates an image [`Handle`] containing the image data directly.
+    ///
+    /// Makes an educated guess about the image format by examining the given data.
+    ///
+    /// This is useful if you already have your image loaded in-memory, maybe
+    /// because you downloaded or generated it procedurally.
+    pub fn from_memory(
+        bytes: impl AsRef<[u8]> + Send + Sync + 'static,
+    ) -> Handle {
+        Self::from_data(Data::Bytes(Bytes::new(bytes)))
+    }
+
+    fn from_data(data: Data) -> Handle {
+        let mut hasher = Hasher::default();
+        data.hash(&mut hasher);
+
+        Handle {
+            id: hasher.finish(),
+            data,
+        }
+    }
+
+    /// Returns the unique identifier of the [`Handle`].
+    pub fn id(&self) -> u64 {
+        self.id
+    }
+
+    /// Returns a reference to the image [`Data`].
+    pub fn data(&self) -> &Data {
+        &self.data
+    }
+}
+
+impl<T> From<T> for Handle
+where
+    T: Into<PathBuf>,
+{
+    fn from(path: T) -> Handle {
+        Handle::from_path(path.into())
+    }
+}
+
+impl Hash for Handle {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.id.hash(state);
+    }
+}
+
+/// A wrapper around raw image data.
+///
+/// It behaves like a `&[u8]`.
+#[derive(Clone)]
+pub struct Bytes(Arc<dyn AsRef<[u8]> + Send + Sync + 'static>);
+
+impl Bytes {
+    /// Creates new [`Bytes`] around `data`.
+    pub fn new(data: impl AsRef<[u8]> + Send + Sync + 'static) -> Self {
+        Self(Arc::new(data))
+    }
+}
+
+impl std::fmt::Debug for Bytes {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.as_ref().as_ref().fmt(f)
+    }
+}
+
+impl std::hash::Hash for Bytes {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.0.as_ref().as_ref().hash(state);
+    }
+}
+
+impl AsRef<[u8]> for Bytes {
+    fn as_ref(&self) -> &[u8] {
+        self.0.as_ref().as_ref()
+    }
+}
+
+impl std::ops::Deref for Bytes {
+    type Target = [u8];
+
+    fn deref(&self) -> &[u8] {
+        self.0.as_ref().as_ref()
+    }
+}
+
+/// The data of a raster image.
+#[derive(Clone, Hash)]
+pub enum Data {
+    /// File data
+    Path(PathBuf),
+
+    /// In-memory data
+    Bytes(Bytes),
+
+    /// Decoded image pixels in RGBA format.
+    Rgba {
+        /// The width of the image.
+        width: u32,
+        /// The height of the image.
+        height: u32,
+        /// The pixels.
+        pixels: Bytes,
+    },
+}
+
+impl std::fmt::Debug for Data {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Data::Path(path) => write!(f, "Path({path:?})"),
+            Data::Bytes(_) => write!(f, "Bytes(...)"),
+            Data::Rgba { width, height, .. } => {
+                write!(f, "Pixels({width} * {height})")
+            }
+        }
+    }
+}
+
+/// A [`Renderer`] that can render raster graphics.
+///
+/// [renderer]: crate::renderer
+pub trait Renderer: crate::Renderer {
+    /// The image Handle to be displayed. Iced exposes its own default implementation of a [`Handle`]
+    ///
+    /// [`Handle`]: Self::Handle
+    type Handle: Clone + Hash;
+
+    /// Returns the dimensions of an image for the given [`Handle`].
+    fn dimensions(&self, handle: &Self::Handle) -> Size<u32>;
+
+    /// Draws an image with the given [`Handle`] and inside the provided
+    /// `bounds`.
+    fn draw(&mut self, handle: Self::Handle, bounds: Rectangle);
+}