chore: initial commit

src/app/document/raster.rs

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MPL-2.0
+// src/app/document/raster.rs
+
+use std::path::PathBuf;
+
+use cosmic::iced::widget::image as iced_image;
+use image::{GenericImageView, DynamicImage, ImageReader};
+
+/// Represents a raster image document (PNG, JPEG, WebP, ...).
+pub struct RasterDocument {
+    pub path: Option<PathBuf>,
+    pub image: DynamicImage,
+    pub handle: iced_image::Handle,
+}
+
+impl RasterDocument {
+    /// Load a raster document from disk.
+    pub fn open(path: PathBuf) -> image::ImageResult<Self> {
+        let img = ImageReader::open(&path)?.decode()?;
+        let handle = Self::build_handle(&img);
+
+        Ok(Self {
+            path: Some(path),
+            image: img,
+            handle,
+        })
+    }
+
+    /// Construct a handle from a DynamicImage.
+    fn build_handle(img: &DynamicImage) -> iced_image::Handle {
+        // Get image dimensions.
+        let (w, h) = img.dimensions();
+
+        // Convert to RGBA8 buffer and extract raw bytes.
+        let rgba = img.to_rgba8();
+        let pixels = rgba.into_raw(); // Vec<u8>
+
+        // Build an iced image handle from raw RGBA pixels.
+        iced_image::Handle::from_rgba(w, h, pixels)
+    }
+
+    /// Rebuild the handle after mutating `image`.
+    pub fn refresh_handle(&mut self) {
+        self.handle = Self::build_handle(&self.image);
+    }
+
+    /// Returns the native pixel dimensions (width, height).
+    pub fn dimensions(&self) -> (u32, u32) {
+        self.image.dimensions()
+    }
+
+    /// Save the current image back to disk (overwrite).
+    pub fn save(&self) -> image::ImageResult<()> {
+        if let Some(path) = &self.path {
+            self.image.save(path)
+        } else {
+            // Cant imagine that it happen but caller should handle missing path case.
+            Err(image::ImageError::Parameter(
+                image::error::ParameterError::from_kind(image::error::ParameterErrorKind::Generic(
+                    "RasterDocument does not have a path".into(),
+                )),
+            ))
+        }
+    }
+}