Eliminate GlobalTransform -> TRS conversions and add warning

Author: HackerFoo

crates/bevy_text/src/text2d.rs

@@ -68,7 +68,7 @@ pub fn extract_text2d_sprite(
     text2d_query: Extract<Query<(Entity, &Visibility, &Text, &GlobalTransform, &Text2dSize)>>,
 ) {
     let scale_factor = windows.scale_factor(WindowId::primary()) as f32;
-    for (entity, visibility, text, transform, calculated_size) in text2d_query.iter() {
+    for (entity, visibility, text, text_transform, calculated_size) in text2d_query.iter() {
         if !visibility.is_visible {
             continue;
         }
@@ -86,9 +86,6 @@ pub fn extract_text2d_sprite(
                 HorizontalAlign::Right => Vec3::new(-width, 0.0, 0.0),
             };
 
-            let mut text_transform = Transform::from(*transform);
-            text_transform.scale /= scale_factor;
-
             for text_glyph in text_glyphs {
                 let color = text.sections[text_glyph.section_index]
                     .style
@@ -104,11 +101,13 @@ pub fn extract_text2d_sprite(
                 let glyph_transform = Transform::from_translation(
                     alignment_offset * scale_factor + text_glyph.position.extend(0.),
                 );
-
-                let transform = text_transform.mul_transform(glyph_transform);
+                // NOTE: Should match `bevy_ui::render::extract_text_uinodes`
+                let transform = *text_transform
+                    * GlobalTransform::from_scale(Vec3::splat(scale_factor.recip()))
+                    * glyph_transform;
 
                 extracted_sprites.sprites.push(ExtractedSprite {
-                    transform: transform.into(),
+                    transform,
                     color,
                     rect,
                     custom_size: None,

crates/bevy_transform/src/components/transform.rs

@@ -339,6 +339,8 @@ impl Default for Transform {
     }
 }
 
+/// The transform is expected to be non-degenerate and without shearing, or the output
+/// will be invalid.
 impl From<GlobalTransform> for Transform {
     fn from(transform: GlobalTransform) -> Self {
         transform.compute_transform()

crates/bevy_ui/src/render/mod.rs

@@ -305,10 +305,9 @@ pub fn extract_text_uinodes(
                 let rect = atlas.textures[index];
                 let atlas_size = Some(atlas.size);
 
-                let (scale, rotation, translation) =
-                    global_transform.to_scale_rotation_translation();
-                let extracted_transform = Mat4::from_rotation_translation(rotation, translation)
-                    * Mat4::from_scale(scale / scale_factor)
+                // NOTE: Should match `bevy_text::text2d::extract_text2d_sprite`
+                let extracted_transform = global_transform.compute_matrix()
+                    * Mat4::from_scale(Vec3::splat(scale_factor.recip()))
                     * Mat4::from_translation(
                         alignment_offset * scale_factor + text_glyph.position.extend(0.),
                     );