WIP

gpui/src/platform/mac/renderer.rs

@@ -510,7 +510,7 @@ impl Renderer {
             );
 
             // Snap sprite to pixel grid.
-            let origin = (icon.bounds.origin() * scene.scale_factor()).floor();
+            let origin = (icon.bounds.origin() * scene.scale_factor()); //.floor();
             sprites_by_atlas
                 .entry(sprite.atlas_id)
                 .or_insert_with(Vec::new)

gpui/src/platform/mac/shaders/shaders.h

@@ -49,7 +49,8 @@ typedef enum {
 
 typedef struct {
     vector_float2 origin;
-    vector_float2 size;
+    vector_float2 target_size;
+    vector_float2 source_size;
     vector_float2 atlas_origin;
     vector_uchar4 color;
     uint8_t compute_winding;

gpui/src/platform/mac/shaders/shaders.metal

@@ -186,9 +186,9 @@ vertex SpriteFragmentInput sprite_vertex(
 ) {
     float2 unit_vertex = unit_vertices[unit_vertex_id];
     GPUISprite sprite = sprites[sprite_id];
-    float2 position = unit_vertex * sprite.size + sprite.origin;
+    float2 position = unit_vertex * sprite.target_size + sprite.origin;
     float4 device_position = to_device_position(position, *viewport_size);
-    float2 atlas_position = (unit_vertex * sprite.size + sprite.atlas_origin) / *atlas_size;
+    float2 atlas_position = (unit_vertex * sprite.source_size + sprite.atlas_origin) / *atlas_size;
 
     return SpriteFragmentInput {
         device_position,

gpui/src/platform/mac/sprite_cache.rs

@@ -140,8 +140,23 @@ impl SpriteCache {
         size: Vector2F,
         path: Cow<'static, str>,
         svg: usvg::Tree,
+        target_position: Vector2F,
         scale_factor: f32,
     ) -> IconSprite {
+        const SUBPIXEL_VARIANTS: u8 = 4;
+
+        let target_position = target_position * scale_factor;
+        let subpixel_variant = (
+            (target_position.x().fract() * SUBPIXEL_VARIANTS as f32).round() as u8
+                % SUBPIXEL_VARIANTS,
+            (target_position.y().fract() * SUBPIXEL_VARIANTS as f32).round() as u8
+                % SUBPIXEL_VARIANTS,
+        );
+        let subpixel_shift = vec2f(
+            subpixel_variant.0 as f32 / SUBPIXEL_VARIANTS as f32,
+            subpixel_variant.1 as f32 / SUBPIXEL_VARIANTS as f32,
+        );
+
         let atlases = &mut self.atlases;
         let atlas_size = self.atlas_size;
         let device = &self.device;