LibGfx: Decrease flatness a little in Path::stroke_to_fill()

Noticed larger stroke widths were looking a little 'low poly', this looks a little nicer. (Minor LibWeb test changes)
Author: https://github.com/MacDue Commit: https://github.com/SerenityOS/serenity/commit/e9e1ee11d4 Pull-request: https://github.com/SerenityOS/serenity/pull/22875
2024-01-21 15:17:52 +00:00 · 2024-01-21 15:17:52 +00:00 · e9e1ee11d4 · 2024-07-17 09:49:48 +09:00
commit e9e1ee11d4
parent 58df9c45b9
3 changed files with 9 additions and 5 deletions
--- a/Tests/LibWeb/Ref/reference/images/svg-background-no-natural-size-ref.png
+++ b/Tests/LibWeb/Ref/reference/images/svg-background-no-natural-size-ref.png
--- a/Tests/LibWeb/Ref/reference/images/svg-textPath-ref.png
+++ b/Tests/LibWeb/Ref/reference/images/svg-textPath-ref.png
--- a/Userland/Libraries/LibGfx/Path.cpp
+++ b/Userland/Libraries/LibGfx/Path.cpp
@ -513,11 +513,15 @@ Path Path::stroke_to_fill(float thickness) const
        }
    }

-    // Note: This is the same as the tolerance from bezier curve splitting.
-    constexpr auto flatness = 0.5f;
-    auto pen_vertex_count = (thickness >= 2 * flatness) ? max(
-                                static_cast<int>(ceilf(AK::Pi<float> / acosf(1 - (2 * flatness) / thickness))), 4)
-                                                        : 4;
+    constexpr auto flatness = 0.15f;
+    auto pen_vertex_count = 4;
+    if (thickness > flatness) {
+        pen_vertex_count = max(
+            static_cast<int>(ceilf(AK::Pi<float>
+                / acosf(1 - (2 * flatness) / thickness))),
+            pen_vertex_count);
+    }
+
    if (pen_vertex_count % 2 == 1)
        pen_vertex_count += 1;