From 6a505dd09610b16332c86e2f243967cdb8a849e8 Mon Sep 17 00:00:00 2001
From: Sahin Habermann <sahyno1996@gmail.com>
Date: Sun, 25 Feb 2018 15:09:30 +0100
Subject: [PATCH] Fix AA performance

---
 common/menu.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/common/menu.c b/common/menu.c
index efd9b5c..bae6800 100644
--- a/common/menu.c
+++ b/common/menu.c
@@ -201,7 +201,6 @@ static void drawEntry(menuEntry_s* me, int off_x, int is_active) {
 }
 
 color_t frontWaveGradient[720];
-color_t aaColors[3][256*256*256][10];
 
 void computeFrontGradient(color_t baseColor, int height) {
     int y;
@@ -245,9 +244,8 @@ color_t waveBlendAdd(color_t a, color_t b, float alpha) {
 
 void drawWave(int id, float timer, color_t color, int height, float phase, float speed) {
     int x, y;
-    float wave_top_y, alpha;
+    float wave_top_y, alpha, one_minus_alpha;
     color_t existing_color, new_color;
-    color_t *aa_color_ptr;
     
     height = 720 - height;
 
@@ -263,22 +261,20 @@ void drawWave(int id, float timer, color_t color, int height, float phase, float
             if (themeCurrent.enableWaveBlending) {
                 existing_color = FetchPixelColor(x, y);
                 new_color = waveBlendAdd(existing_color, color, clamp(alpha, 0.0, 1.0) * 0.3);
-            }
-            else if (alpha < 0.3) { // anti-aliasing
-                existing_color = FetchPixelColor(x, y);
-                alpha = fabs(alpha);
-                aa_color_ptr = &aaColors[id][existing_color.abgr & 0xFFFFFF][(int)(alpha * 10) - 1];
-                new_color = *aa_color_ptr;
-
-                if (new_color.abgr == 0) {
-                    new_color = *aa_color_ptr = MakeColor(color.r * (1.0 - alpha) + existing_color.r * alpha, color.g * (1.0 - alpha) + existing_color.g * alpha, color.b * (1.0 - alpha) + existing_color.b * alpha, 255);
+            }      
+            else if (alpha >= 0.3) { 
+                if (id == 2) {
+                    new_color = frontWaveGradient[y];
+                } 
+                else { // no anti-aliasing
+                    new_color = color;
                 }
             }
-            else if (id == 2) { // darken closer to bottom of the front wave
-                new_color = frontWaveGradient[y];
-            }
-            else {
-                new_color = color;
+            else { // anti-aliasing
+                existing_color = FetchPixelColor(x, y);
+                alpha = fabs(alpha);
+                one_minus_alpha = (1.0 - alpha);
+                new_color = MakeColor(color.r * one_minus_alpha + existing_color.r * alpha, color.g * one_minus_alpha + existing_color.g * alpha, color.b * one_minus_alpha + existing_color.b * alpha, 255);
             }
 
             DrawPixelRaw(x, y, new_color);