Move TextureAtlas and friends into bevy_image (#17219)

# Objective

- Allow other crates to use `TextureAtlas` and friends without needing
to depend on `bevy_sprite`.
- Specifically, this allows adding `TextureAtlas` support to custom
cursors in #17121 by allowing
`bevy_winit` to depend on `bevy_image` instead of `bevy_sprite` which is
a [non-starter].

[non-starter]:
#17121 (comment)

## Solution

- Move `TextureAtlas`, `TextureAtlasBuilder`, `TextureAtlasSources`,
`TextureAtlasLayout` and `DynamicTextureAtlasBuilder` into `bevy_image`.
- Add a new plugin to `bevy_image` named `TextureAtlasPlugin` which
allows us to register `TextureAtlas` and `TextureAtlasLayout` which was
previously done in `SpritePlugin`. Since `SpritePlugin` did the
registration previously, we just need to make it add
`TextureAtlasPlugin`.

## Testing

- CI builds it.
- I also ran multiple examples which hopefully covered any issues:

```
$ cargo run --example sprite
$ cargo run --example text
$ cargo run --example ui_texture_atlas
$ cargo run --example sprite_animation
$ cargo run --example sprite_sheet
$ cargo run --example sprite_picking
```

---

## Migration Guide

The following types have been moved from `bevy_sprite` to `bevy_image`:
`TextureAtlas`, `TextureAtlasBuilder`, `TextureAtlasSources`,
`TextureAtlasLayout` and `DynamicTextureAtlasBuilder`.

If you are using the `bevy` crate, and were importing these types
directly (e.g. before `use bevy::sprite::TextureAtlas`), be sure to
update your import paths (e.g. after `use bevy::image::TextureAtlas`)

If you are using the `bevy` prelude to import these types (e.g. `use
bevy::prelude::*`), you don't need to change anything.

If you are using the `bevy_sprite` subcrate, be sure to add `bevy_image`
as a dependency if you do not already have it, and be sure to update
your import paths.

crates/bevy_image/Cargo.toml

@@ -26,12 +26,15 @@ qoi = ["image/qoi"]
 tga = ["image/tga"]
 tiff = ["image/tiff"]
 webp = ["image/webp"]
+serialize = []
 
 # For ktx2 supercompression
 zlib = ["flate2"]
 zstd = ["ruzstd"]
 
 [dependencies]
+# bevy
+bevy_app = { path = "../bevy_app", version = "0.16.0-dev" }
 bevy_asset = { path = "../bevy_asset", version = "0.16.0-dev" }
 bevy_color = { path = "../bevy_color", version = "0.16.0-dev", features = [
   "serialize",
@@ -55,6 +58,8 @@ wgpu = { version = "23.0.1", default-features = false }
 serde = { version = "1", features = ["derive"] }
 thiserror = { version = "2", default-features = false }
 futures-lite = "2.0.1"
+guillotiere = "0.6.0"
+rectangle-pack = "0.4"
 ddsfile = { version = "0.5.2", optional = true }
 ktx2 = { version = "0.3.0", optional = true }
 # For ktx2 supercompression
@@ -64,6 +69,10 @@ ruzstd = { version = "0.7.0", optional = true }
 basis-universal = { version = "0.3.0", optional = true }
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 
+[dev-dependencies]
+bevy_ecs = { path = "../bevy_ecs", version = "0.16.0-dev" }
+bevy_sprite = { path = "../bevy_sprite", version = "0.16.0-dev" }
+
 [lints]
 workspace = true
 

crates/bevy_sprite/src/dynamic_texture_atlas_builder.rs → crates/bevy_image/src/dynamic_texture_atlas_builder.rs

@@ -1,7 +1,6 @@
-use crate::TextureAtlasLayout;
-use bevy_image::{Image, TextureFormatPixelInfo};
+use crate::{Image, TextureAtlasLayout, TextureFormatPixelInfo as _};
+use bevy_asset::RenderAssetUsages;
 use bevy_math::{URect, UVec2};
-use bevy_render::render_asset::RenderAssetUsages;
 use guillotiere::{size2, Allocation, AtlasAllocator};
 
 /// Helper utility to update [`TextureAtlasLayout`] on the fly.

crates/bevy_image/src/lib.rs

@@ -1,8 +1,14 @@
 #![expect(missing_docs, reason = "Not all docs are written yet, see #3492.")]
 #![allow(unsafe_code)]
 
+extern crate alloc;
+
 pub mod prelude {
-    pub use crate::{BevyDefault as _, Image, ImageFormat, TextureError};
+    pub use crate::{
+        dynamic_texture_atlas_builder::DynamicTextureAtlasBuilder,
+        texture_atlas::{TextureAtlas, TextureAtlasLayout, TextureAtlasSources},
+        BevyDefault as _, Image, ImageFormat, TextureAtlasBuilder, TextureError,
+    };
 }
 
 mod image;
@@ -13,25 +19,31 @@ mod basis;
 mod compressed_image_saver;
 #[cfg(feature = "dds")]
 mod dds;
+mod dynamic_texture_atlas_builder;
 #[cfg(feature = "exr")]
 mod exr_texture_loader;
 #[cfg(feature = "hdr")]
 mod hdr_texture_loader;
 mod image_loader;
 #[cfg(feature = "ktx2")]
 mod ktx2;
+mod texture_atlas;
+mod texture_atlas_builder;
 
 #[cfg(feature = "basis-universal")]
 pub use compressed_image_saver::*;
 #[cfg(feature = "dds")]
 pub use dds::*;
+pub use dynamic_texture_atlas_builder::*;
 #[cfg(feature = "exr")]
 pub use exr_texture_loader::*;
 #[cfg(feature = "hdr")]
 pub use hdr_texture_loader::*;
 pub use image_loader::*;
 #[cfg(feature = "ktx2")]
 pub use ktx2::*;
+pub use texture_atlas::*;
+pub use texture_atlas_builder::*;
 
 pub(crate) mod image_texture_conversion;
 pub use image_texture_conversion::IntoDynamicImageError;

crates/bevy_sprite/src/texture_atlas.rs → crates/bevy_image/src/texture_atlas.rs

@@ -1,11 +1,24 @@
-use bevy_asset::{Asset, AssetId, Assets, Handle};
-use bevy_image::Image;
+use bevy_app::prelude::*;
+use bevy_asset::{Asset, AssetApp as _, AssetId, Assets, Handle};
 use bevy_math::{URect, UVec2};
 use bevy_reflect::{std_traits::ReflectDefault, Reflect};
 #[cfg(feature = "serialize")]
 use bevy_reflect::{ReflectDeserialize, ReflectSerialize};
 use bevy_utils::HashMap;
 
+use crate::Image;
+
+/// Adds support for texture atlases.
+pub struct TextureAtlasPlugin;
+
+impl Plugin for TextureAtlasPlugin {
+    fn build(&self, app: &mut App) {
+        app.init_asset::<TextureAtlasLayout>()
+            .register_asset_reflect::<TextureAtlasLayout>()
+            .register_type::<TextureAtlas>();
+    }
+}
+
 /// Stores a mapping from sub texture handles to the related area index.
 ///
 /// Generated by [`TextureAtlasBuilder`].

crates/bevy_sprite/src/texture_atlas_builder.rs → crates/bevy_image/src/texture_atlas_builder.rs

@@ -1,18 +1,15 @@
-use bevy_asset::AssetId;
-use bevy_image::{Image, TextureFormatPixelInfo};
+use bevy_asset::{AssetId, RenderAssetUsages};
 use bevy_math::{URect, UVec2};
-use bevy_render::{
-    render_asset::RenderAssetUsages,
-    render_resource::{Extent3d, TextureDimension, TextureFormat},
-};
 use bevy_utils::HashMap;
 use rectangle_pack::{
     contains_smallest_box, pack_rects, volume_heuristic, GroupedRectsToPlace, PackedLocation,
     RectToInsert, TargetBin,
 };
 use thiserror::Error;
 use tracing::{debug, error, warn};
+use wgpu_types::{Extent3d, TextureDimension, TextureFormat};
 
+use crate::{Image, TextureFormatPixelInfo};
 use crate::{TextureAtlasLayout, TextureAtlasSources};
 
 #[derive(Debug, Error)]
@@ -166,8 +163,7 @@ impl<'a> TextureAtlasBuilder<'a> {
     /// # use bevy_sprite::prelude::*;
     /// # use bevy_ecs::prelude::*;
     /// # use bevy_asset::*;
-    /// # use bevy_render::prelude::*;
-    /// # use bevy_image::Image;
+    /// # use bevy_image::prelude::*;
     ///
     /// fn my_system(mut commands: Commands, mut textures: ResMut<Assets<Image>>, mut layouts: ResMut<Assets<TextureAtlasLayout>>) {
     ///     // Declare your builder

crates/bevy_internal/Cargo.toml

@@ -89,10 +89,10 @@ shader_format_spirv = ["bevy_render/shader_format_spirv"]
 serialize = [
   "bevy_color?/serialize",
   "bevy_ecs/serialize",
+  "bevy_image?/serialize",
   "bevy_input/serialize",
   "bevy_math/serialize",
   "bevy_scene?/serialize",
-  "bevy_sprite?/serialize",
   "bevy_time/serialize",
   "bevy_transform/serialize",
   "bevy_ui?/serialize",

crates/bevy_sprite/Cargo.toml

@@ -10,7 +10,6 @@ keywords = ["bevy"]
 
 [features]
 bevy_sprite_picking_backend = ["bevy_picking", "bevy_window"]
-serialize = ["dep:serde"]
 webgl = []
 webgpu = []
 
@@ -36,14 +35,10 @@ bevy_derive = { path = "../bevy_derive", version = "0.16.0-dev" }
 # other
 bytemuck = { version = "1", features = ["derive", "must_cast"] }
 fixedbitset = "0.5"
-guillotiere = "0.6.0"
-thiserror = { version = "2", default-features = false }
 derive_more = { version = "1", default-features = false, features = ["from"] }
-rectangle-pack = "0.4"
 bitflags = "2.3"
 radsort = "0.1"
 nonmax = "0.5"
-serde = { version = "1", features = ["derive"], optional = true }
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 
 [lints]

crates/bevy_sprite/src/lib.rs

@@ -15,14 +15,11 @@
 
 extern crate alloc;
 
-mod dynamic_texture_atlas_builder;
 mod mesh2d;
 #[cfg(feature = "bevy_sprite_picking_backend")]
 mod picking_backend;
 mod render;
 mod sprite;
-mod texture_atlas;
-mod texture_atlas_builder;
 mod texture_slice;
 
 /// The sprite prelude.
@@ -32,27 +29,23 @@ pub mod prelude {
     #[doc(hidden)]
     pub use crate::{
         sprite::{Sprite, SpriteImageMode},
-        texture_atlas::{TextureAtlas, TextureAtlasLayout, TextureAtlasSources},
         texture_slice::{BorderRect, SliceScaleMode, TextureSlice, TextureSlicer},
-        ColorMaterial, MeshMaterial2d, TextureAtlasBuilder,
+        ColorMaterial, MeshMaterial2d,
     };
 }
 
-pub use dynamic_texture_atlas_builder::*;
 pub use mesh2d::*;
 #[cfg(feature = "bevy_sprite_picking_backend")]
 pub use picking_backend::*;
 pub use render::*;
 pub use sprite::*;
-pub use texture_atlas::*;
-pub use texture_atlas_builder::*;
 pub use texture_slice::*;
 
 use bevy_app::prelude::*;
-use bevy_asset::{load_internal_asset, AssetApp, Assets, Handle};
+use bevy_asset::{load_internal_asset, Assets, Handle};
 use bevy_core_pipeline::core_2d::Transparent2d;
 use bevy_ecs::prelude::*;
-use bevy_image::Image;
+use bevy_image::{prelude::*, TextureAtlasPlugin};
 use bevy_render::{
     mesh::{Mesh, Mesh2d, MeshAabb},
     primitives::Aabb,
@@ -111,13 +104,15 @@ impl Plugin for SpritePlugin {
             "render/sprite_view_bindings.wgsl",
             Shader::from_wgsl
         );
-        app.init_asset::<TextureAtlasLayout>()
-            .register_asset_reflect::<TextureAtlasLayout>()
-            .register_type::<Sprite>()
+
+        if !app.is_plugin_added::<TextureAtlasPlugin>() {
+            app.add_plugins(TextureAtlasPlugin);
+        }
+
+        app.register_type::<Sprite>()
             .register_type::<SpriteImageMode>()
             .register_type::<TextureSlicer>()
             .register_type::<Anchor>()
-            .register_type::<TextureAtlas>()
             .register_type::<Mesh2d>()
             .add_plugins((Mesh2dRenderPlugin, ColorMaterialPlugin))
             .add_systems(

crates/bevy_sprite/src/picking_backend.rs

@@ -2,12 +2,12 @@
 //! sprites with arbitrary transforms. Picking is done based on sprite bounds, not visible pixels.
 //! This means a partially transparent sprite is pickable even in its transparent areas.
 
-use crate::{Sprite, TextureAtlasLayout};
+use crate::Sprite;
 use bevy_app::prelude::*;
 use bevy_asset::prelude::*;
 use bevy_color::Alpha;
 use bevy_ecs::prelude::*;
-use bevy_image::Image;
+use bevy_image::prelude::*;
 use bevy_math::{prelude::*, FloatExt};
 use bevy_picking::backend::prelude::*;
 use bevy_reflect::prelude::*;

crates/bevy_sprite/src/render/mod.rs

@@ -1,8 +1,6 @@
 use core::ops::Range;
 
-use crate::{
-    texture_atlas::TextureAtlasLayout, ComputedTextureSlices, Sprite, SPRITE_SHADER_HANDLE,
-};
+use crate::{ComputedTextureSlices, Sprite, SPRITE_SHADER_HANDLE};
 use bevy_asset::{AssetEvent, AssetId, Assets};
 use bevy_color::{ColorToComponents, LinearRgba};
 use bevy_core_pipeline::{
@@ -17,7 +15,7 @@ use bevy_ecs::{
     query::ROQueryItem,
     system::{lifetimeless::*, SystemParamItem, SystemState},
 };
-use bevy_image::{BevyDefault, Image, ImageSampler, TextureFormatPixelInfo};
+use bevy_image::{BevyDefault, Image, ImageSampler, TextureAtlasLayout, TextureFormatPixelInfo};
 use bevy_math::{Affine3A, FloatOrd, Quat, Rect, Vec2, Vec4};
 use bevy_render::sync_world::MainEntity;
 use bevy_render::view::RenderVisibleEntities;

crates/bevy_sprite/src/sprite.rs

@@ -4,7 +4,7 @@ use bevy_ecs::{
     component::{require, Component},
     reflect::ReflectComponent,
 };
-use bevy_image::Image;
+use bevy_image::{Image, TextureAtlas, TextureAtlasLayout};
 use bevy_math::{Rect, UVec2, Vec2};
 use bevy_reflect::{std_traits::ReflectDefault, Reflect};
 use bevy_render::{
@@ -13,7 +13,7 @@ use bevy_render::{
 };
 use bevy_transform::components::Transform;
 
-use crate::{TextureAtlas, TextureAtlasLayout, TextureSlicer};
+use crate::TextureSlicer;
 
 /// Describes a sprite to be rendered to a 2D camera
 #[derive(Component, Debug, Default, Clone, Reflect)]
@@ -230,10 +230,11 @@ mod tests {
     use bevy_asset::{Assets, RenderAssetUsages};
     use bevy_color::Color;
     use bevy_image::Image;
+    use bevy_image::{TextureAtlas, TextureAtlasLayout};
     use bevy_math::{Rect, URect, UVec2, Vec2};
     use bevy_render::render_resource::{Extent3d, TextureDimension, TextureFormat};
 
-    use crate::{Anchor, TextureAtlas, TextureAtlasLayout};
+    use crate::Anchor;
 
     use super::Sprite;
 

crates/bevy_text/src/font_atlas.rs

@@ -1,11 +1,10 @@
 use bevy_asset::{Assets, Handle};
-use bevy_image::{Image, ImageSampler};
+use bevy_image::{prelude::*, ImageSampler};
 use bevy_math::{IVec2, UVec2};
 use bevy_render::{
     render_asset::RenderAssetUsages,
     render_resource::{Extent3d, TextureDimension, TextureFormat},
 };
-use bevy_sprite::{DynamicTextureAtlasBuilder, TextureAtlasLayout};
 use bevy_utils::HashMap;
 
 use crate::{FontSmoothing, GlyphAtlasLocation, TextError};
@@ -21,7 +20,7 @@ use crate::{FontSmoothing, GlyphAtlasLocation, TextError};
 /// providing a trade-off between visual quality and performance.
 ///
 /// A [`CacheKey`](cosmic_text::CacheKey) encodes all of the information of a subpixel-offset glyph and is used to
-/// find that glyphs raster in a [`TextureAtlas`](bevy_sprite::TextureAtlas) through its corresponding [`GlyphAtlasLocation`].
+/// find that glyphs raster in a [`TextureAtlas`] through its corresponding [`GlyphAtlasLocation`].
 pub struct FontAtlas {
     /// Used to update the [`TextureAtlasLayout`].
     pub dynamic_texture_atlas_builder: DynamicTextureAtlasBuilder,

crates/bevy_text/src/font_atlas_set.rs

@@ -3,14 +3,13 @@ use bevy_ecs::{
     event::EventReader,
     system::{ResMut, Resource},
 };
-use bevy_image::Image;
+use bevy_image::prelude::*;
 use bevy_math::{IVec2, UVec2};
 use bevy_reflect::TypePath;
 use bevy_render::{
     render_asset::RenderAssetUsages,
     render_resource::{Extent3d, TextureDimension, TextureFormat},
 };
-use bevy_sprite::TextureAtlasLayout;
 use bevy_utils::HashMap;
 
 use crate::{error::TextError, Font, FontAtlas, FontSmoothing, GlyphAtlasInfo};

crates/bevy_text/src/glyph.rs

@@ -1,10 +1,9 @@
 //! This module exports types related to rendering glyphs.
 
 use bevy_asset::Handle;
-use bevy_image::Image;
+use bevy_image::prelude::*;
 use bevy_math::{IVec2, Vec2};
 use bevy_reflect::Reflect;
-use bevy_sprite::TextureAtlasLayout;
 
 /// A glyph of a font, typically representing a single character, positioned in screen space.
 ///

crates/bevy_text/src/pipeline.rs

@@ -9,10 +9,9 @@ use bevy_ecs::{
     reflect::ReflectComponent,
     system::{ResMut, Resource},
 };
-use bevy_image::Image;
+use bevy_image::prelude::*;
 use bevy_math::{UVec2, Vec2};
 use bevy_reflect::{std_traits::ReflectDefault, Reflect};
-use bevy_sprite::TextureAtlasLayout;
 use bevy_utils::HashMap;
 
 use cosmic_text::{Attrs, Buffer, Family, Metrics, Shaping, Wrap};

crates/bevy_text/src/text2d.rs

@@ -16,7 +16,7 @@ use bevy_ecs::{
     query::{Changed, Without},
     system::{Commands, Local, Query, Res, ResMut},
 };
-use bevy_image::Image;
+use bevy_image::prelude::*;
 use bevy_math::Vec2;
 use bevy_reflect::{prelude::ReflectDefault, Reflect};
 use bevy_render::sync_world::TemporaryRenderEntity;
@@ -26,7 +26,7 @@ use bevy_render::{
     view::{NoFrustumCulling, ViewVisibility},
     Extract,
 };
-use bevy_sprite::{Anchor, ExtractedSprite, ExtractedSprites, Sprite, TextureAtlasLayout};
+use bevy_sprite::{Anchor, ExtractedSprite, ExtractedSprites, Sprite};
 use bevy_transform::components::Transform;
 use bevy_transform::prelude::GlobalTransform;
 use bevy_window::{PrimaryWindow, Window};