get pixel size from wgpu (#6820)

# Objective

- Get rid of giant match statement to get PixelInfo. 
- This will allow for supporting any texture that is uncompressed, instead of people needing to PR in any textures that are supported in wgpu, but not bevy.

## Solution

- More conservative alternative to #6788, where we don't try to make some of the calculations correct for compressed types.
- Delete `PixelInfo` and get the pixel_size directly from wgpu. Data from wgpu is here: https://docs.rs/wgpu-types/0.14.0/src/wgpu_types/lib.rs.html#2359
- Panic if the texture is a compressed type. An integer byte size of a pixel is no longer a valid concept when talking about compressed textures.
- All internal usages use `pixel_size` and not `pixel_info` and are on uncompressed formats. Most of these usages are on either explicit texture formats or slightly indirectly through `TextureFormat::bevy_default()`. The other uses are in `TextureAtlas` and have other calculations that assumes the texture is uncompressed. 

## Changelog

- remove `PixelInfo` and get `pixel_size` from wgpu

## Migration Guide

`PixelInfo` has been removed. `PixelInfo::components` is equivalent to `texture_format.describe().components`. `PixelInfo::type_size` can be gotten from `texture_format.describe().block_size/ texture_format.describe().components`. But note this can yield incorrect results for some texture types like Rg11b10Float.

Author: hymm

crates/bevy_render/src/texture/image.rs

@@ -464,134 +464,18 @@ impl Volume for Extent3d {
     }
 }
 
-/// Information about the pixel size in bytes and the number of different components.
-pub struct PixelInfo {
-    /// The size of a component of a pixel in bytes.
-    pub type_size: usize,
-    /// The amount of different components (color channels).
-    pub num_components: usize,
-}
-
 /// Extends the wgpu [`TextureFormat`] with information about the pixel.
 pub trait TextureFormatPixelInfo {
-    /// Returns the pixel information of the format.
-    fn pixel_info(&self) -> PixelInfo;
-    /// Returns the size of a pixel of the format.
-    fn pixel_size(&self) -> usize {
-        let info = self.pixel_info();
-        info.type_size * info.num_components
-    }
+    /// Returns the size of a pixel in bytes of the format.
+    fn pixel_size(&self) -> usize;
 }
 
 impl TextureFormatPixelInfo for TextureFormat {
-    #[allow(clippy::match_same_arms)]
-    fn pixel_info(&self) -> PixelInfo {
-        let type_size = match self {
-            // 8bit
-            TextureFormat::R8Unorm
-            | TextureFormat::R8Snorm
-            | TextureFormat::R8Uint
-            | TextureFormat::R8Sint
-            | TextureFormat::Rg8Unorm
-            | TextureFormat::Rg8Snorm
-            | TextureFormat::Rg8Uint
-            | TextureFormat::Rg8Sint
-            | TextureFormat::Rgba8Unorm
-            | TextureFormat::Rgba8UnormSrgb
-            | TextureFormat::Rgba8Snorm
-            | TextureFormat::Rgba8Uint
-            | TextureFormat::Rgba8Sint
-            | TextureFormat::Bgra8Unorm
-            | TextureFormat::Bgra8UnormSrgb => 1,
-
-            // 16bit
-            TextureFormat::R16Uint
-            | TextureFormat::R16Sint
-            | TextureFormat::R16Float
-            | TextureFormat::R16Unorm
-            | TextureFormat::Rg16Uint
-            | TextureFormat::Rg16Sint
-            | TextureFormat::Rg16Unorm
-            | TextureFormat::Rg16Float
-            | TextureFormat::Rgba16Uint
-            | TextureFormat::Rgba16Sint
-            | TextureFormat::Rgba16Float => 2,
-
-            // 32bit
-            TextureFormat::R32Uint
-            | TextureFormat::R32Sint
-            | TextureFormat::R32Float
-            | TextureFormat::Rg32Uint
-            | TextureFormat::Rg32Sint
-            | TextureFormat::Rg32Float
-            | TextureFormat::Rgba32Uint
-            | TextureFormat::Rgba32Sint
-            | TextureFormat::Rgba32Float
-            | TextureFormat::Depth32Float => 4,
-
-            // special cases
-            TextureFormat::Rgb9e5Ufloat => 4,
-            TextureFormat::Rgb10a2Unorm => 4,
-            TextureFormat::Rg11b10Float => 4,
-            TextureFormat::Depth24Plus => 3, // FIXME is this correct?
-            TextureFormat::Depth24PlusStencil8 => 4,
-            // TODO: this is not good! this is a temporary step while porting bevy_render to direct wgpu usage
-            _ => panic!("cannot get pixel info for type"),
-        };
-
-        let components = match self {
-            TextureFormat::R8Unorm
-            | TextureFormat::R8Snorm
-            | TextureFormat::R8Uint
-            | TextureFormat::R8Sint
-            | TextureFormat::R16Uint
-            | TextureFormat::R16Sint
-            | TextureFormat::R16Unorm
-            | TextureFormat::R16Float
-            | TextureFormat::R32Uint
-            | TextureFormat::R32Sint
-            | TextureFormat::R32Float => 1,
-
-            TextureFormat::Rg8Unorm
-            | TextureFormat::Rg8Snorm
-            | TextureFormat::Rg8Uint
-            | TextureFormat::Rg8Sint
-            | TextureFormat::Rg16Uint
-            | TextureFormat::Rg16Sint
-            | TextureFormat::Rg16Unorm
-            | TextureFormat::Rg16Float
-            | TextureFormat::Rg32Uint
-            | TextureFormat::Rg32Sint
-            | TextureFormat::Rg32Float => 2,
-
-            TextureFormat::Rgba8Unorm
-            | TextureFormat::Rgba8UnormSrgb
-            | TextureFormat::Rgba8Snorm
-            | TextureFormat::Rgba8Uint
-            | TextureFormat::Rgba8Sint
-            | TextureFormat::Bgra8Unorm
-            | TextureFormat::Bgra8UnormSrgb
-            | TextureFormat::Rgba16Uint
-            | TextureFormat::Rgba16Sint
-            | TextureFormat::Rgba16Float
-            | TextureFormat::Rgba32Uint
-            | TextureFormat::Rgba32Sint
-            | TextureFormat::Rgba32Float => 4,
-
-            // special cases
-            TextureFormat::Rgb9e5Ufloat
-            | TextureFormat::Rgb10a2Unorm
-            | TextureFormat::Rg11b10Float
-            | TextureFormat::Depth32Float
-            | TextureFormat::Depth24Plus
-            | TextureFormat::Depth24PlusStencil8 => 1,
-            // TODO: this is not good! this is a temporary step while porting bevy_render to direct wgpu usage
-            _ => panic!("cannot get pixel info for type"),
-        };
-
-        PixelInfo {
-            type_size,
-            num_components: components,
+    fn pixel_size(&self) -> usize {
+        let info = self.describe();
+        match info.block_dimensions {
+            (1, 1) => info.block_size.into(),
+            _ => panic!("Using pixel_size for compressed textures is invalid"),
         }
     }
 }