Merge pull request godotengine#93740 from markdibarry/alternative-pixel-rounding

Replace pixel rounding with `floor(x + 0.5)`

Author: akien-mga

scene/2d/animated_sprite_2d.cpp

@@ -267,7 +267,7 @@ void AnimatedSprite2D::_notification(int p_what) {
 			}
 
 			if (get_viewport() && get_viewport()->is_snap_2d_transforms_to_pixel_enabled()) {
-				ofs = ofs.round();
+				ofs = (ofs + Point2(0.5, 0.5)).floor();
 			}
 
 			Rect2 dst_rect(ofs, s);

scene/2d/sprite_2d.cpp

@@ -98,7 +98,7 @@ void Sprite2D::_get_rects(Rect2 &r_src_rect, Rect2 &r_dst_rect, bool &r_filter_c
 	}
 
 	if (get_viewport() && get_viewport()->is_snap_2d_transforms_to_pixel_enabled()) {
-		dest_offset = dest_offset.round();
+		dest_offset = (dest_offset + Point2(0.5, 0.5)).floor();
 	}
 
 	r_dst_rect = Rect2(dest_offset, frame_size);
@@ -400,7 +400,7 @@ Rect2 Sprite2D::get_rect() const {
 	}
 
 	if (get_viewport() && get_viewport()->is_snap_2d_transforms_to_pixel_enabled()) {
-		ofs = ofs.round();
+		ofs = (ofs + Point2(0.5, 0.5)).floor();
 	}
 
 	if (s == Size2(0, 0)) {

scene/gui/rich_text_label.cpp

@@ -1249,7 +1249,7 @@ int RichTextLabel::_draw_line(ItemFrame *p_frame, int p_line, const Vector2 &p_o
 					}
 
 					if (is_inside_tree() && get_viewport()->is_snap_2d_transforms_to_pixel_enabled()) {
-						fx_offset = fx_offset.round();
+						fx_offset = (fx_offset + Point2(0.5, 0.5)).floor();
 					}
 
 					Vector2 char_off = char_xform.get_origin();

servers/rendering/renderer_canvas_cull.cpp

@@ -284,8 +284,8 @@ void RendererCanvasCull::_cull_canvas_item(Item *p_canvas_item, const Transform2
 	}
 
 	if (snapping_2d_transforms_to_pixel) {
-		final_xform.columns[2] = final_xform.columns[2].round();
-		parent_xform.columns[2] = parent_xform.columns[2].round();
+		final_xform.columns[2] = (final_xform.columns[2] + Point2(0.5, 0.5)).floor();
+		parent_xform.columns[2] = (parent_xform.columns[2] + Point2(0.5, 0.5)).floor();
 	}
 
 	final_xform = parent_xform * final_xform;