From 4b8a65268c34a040ef1f1e53411341b4f918d707 Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emilernerfeldt@gmail.com>
Date: Sat, 7 Nov 2020 14:06:14 +0100
Subject: [PATCH] Turn off anti-aliasing in debug builds by default

---
 CHANGELOG.md                  |  1 +
 egui/src/demos/mod.rs         | 12 +-----------
 egui/src/lib.rs               | 10 ++++++++++
 egui/src/paint/tessellator.rs |  3 ++-
 4 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1aab8513..6b23d3c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@
 * `Context::begin_frame()` no longer returns anything.
   * Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
 * `Context::end_frame()` now returns "paint jobs" that need to be converted to triangles with `Context::tesselate()`.
+* Turn off anti-aliasing in debug builds by default.
 
 ## 0.2.0 - 2020-10-10
 
diff --git a/egui/src/demos/mod.rs b/egui/src/demos/mod.rs
index a293af93..957d2d78 100644
--- a/egui/src/demos/mod.rs
+++ b/egui/src/demos/mod.rs
@@ -42,18 +42,8 @@ pub trait Demo {
 
 // ----------------------------------------------------------------------------
 
-#[cfg(debug_assertions)]
-pub fn has_debug_assertions() -> bool {
-    true
-}
-
-#[cfg(not(debug_assertions))]
-pub fn has_debug_assertions() -> bool {
-    false
-}
-
 pub fn warn_if_debug_build(ui: &mut crate::Ui) {
-    if has_debug_assertions() {
+    if crate::has_debug_assertions() {
         ui.label(
             crate::Label::new("[Debug build]")
                 .small()
diff --git a/egui/src/lib.rs b/egui/src/lib.rs
index 682cd460..06373138 100644
--- a/egui/src/lib.rs
+++ b/egui/src/lib.rs
@@ -122,3 +122,13 @@ pub fn text_egui_e2e() {
         assert!(!paint_jobs.is_empty());
     }
 }
+
+#[cfg(debug_assertions)]
+pub(crate) fn has_debug_assertions() -> bool {
+    true
+}
+
+#[cfg(not(debug_assertions))]
+pub(crate) fn has_debug_assertions() -> bool {
+    false
+}
diff --git a/egui/src/paint/tessellator.rs b/egui/src/paint/tessellator.rs
index 4f3f6eef..fdbdc3ce 100644
--- a/egui/src/paint/tessellator.rs
+++ b/egui/src/paint/tessellator.rs
@@ -450,6 +450,7 @@ pub struct TesselationOptions {
     /// Size of a pixel in points, e.g. 0.5
     pub aa_size: f32,
     /// Anti-aliasing makes shapes appear smoother, but requires more triangles and is therefore slower.
+    /// By default this is enabled in release builds and disabled in debug builds.
     pub anti_alias: bool,
     /// If `true` (default) cull certain primitives before tessellating them
     pub coarse_tessellation_culling: bool,
@@ -463,7 +464,7 @@ impl Default for TesselationOptions {
     fn default() -> Self {
         Self {
             aa_size: 1.0,
-            anti_alias: true,
+            anti_alias: !crate::has_debug_assertions(),
             coarse_tessellation_culling: true,
             debug_paint_clip_rects: false,
             debug_ignore_clip_rects: false,