Move, zoom and pan the wallpaper in shiftpaper-render

CHANGELOG.md

@@ -7,6 +7,8 @@
 - shiftpaperd no longer needs a GPU with 16-bit normalised textures, as depth maps now go to the GPU as 16-bit floats.
 - The renderer is now its own crate, `shiftpaper-render`, with no Wayland code, so other front ends can use it.
 - A `parallax_intensity` above 0.05 zooms the wallpaper in a little more, so the biggest shifts no longer stretch its edges.
+- `shiftpaper-render` can show any part of a wallpaper, zoomed in and moved, and pan across it, for front ends that let people frame their photos or follow a launcher's pages.
+- A wallpaper bigger than the GPU's largest texture is shrunk to fit it, instead of failing to show.
 
 ### Fixed
 

crates/render/src/depth.rs

@@ -37,10 +37,13 @@ impl DepthMap {
     }
 
     /// The map resized to `width` x `height`.
-    pub fn resized(self, width: u32, height: u32) -> Self {
-        let image =
-            image::ImageBuffer::<image::Luma<u16>, _>::from_raw(self.width, self.height, self.data)
-                .expect("a depth map's data matches its size");
+    pub fn resized(&self, width: u32, height: u32) -> Self {
+        let image = image::ImageBuffer::<image::Luma<u16>, _>::from_raw(
+            self.width,
+            self.height,
+            self.data.as_slice(),
+        )
+        .expect("a depth map's data matches its size");
         Self {
             data: imageops::resize(&image, width, height, FilterType::Triangle).into_raw(),
             width,

crates/render/src/lib.rs

@@ -5,5 +5,7 @@
 mod depth;
 mod renderer;
 
-pub use renderer::{DecodedWallpaper, OutputRenderState, Renderer, Wallpaper, WallpaperFiles};
+pub use renderer::{
+    DecodedWallpaper, OutputRenderState, Renderer, View, Wallpaper, WallpaperFiles,
+};
 pub use shiftpaper_config::Transition;