From 28e212e0ac79ce54526815437c2428deed252079 Mon Sep 17 00:00:00 2001
From: xxanqw <potik217@gmail.com>
Date: Sun, 30 Nov 2025 00:33:44 +0200
Subject: Add color debugging feature and improve RGB to ANSI conversion

---
 src/color.rs | 45 ++++++++++-----------------------------------
 1 file changed, 10 insertions(+), 35 deletions(-)

(limited to 'src/color.rs')

diff --git a/src/color.rs b/src/color.rs
index f0ab080..ba79353 100644
--- a/src/color.rs
+++ b/src/color.rs
@@ -375,47 +375,22 @@ fn rgb_to_ansi256(r: u8, g: u8, b: u8) -> u8 {
 }
 
 /// Convert RGB to ANSI 16 color code
-fn rgb_to_ansi16(r: u8, g: u8, b: u8) -> u8 {
-    // Calculate brightness
+pub(crate) fn rgb_to_ansi16(r: u8, g: u8, b: u8) -> u8 {
+    // Calculate brightness (perceived luminance)
     let brightness = (r as f32 * 0.299 + g as f32 * 0.587 + b as f32 * 0.114).round() as u8;
-
-    // Determine if it's bright or dark
     let is_bright = brightness > 128;
 
-    // Determine base color
-    let base_color = if r > g && r > b {
-        // Red dominant
-        if r > 192 && g < 64 && b < 64 {
-            1 // Red
-        } else if r > g && r > b {
-            3 // Yellow
-        } else {
-            7 // White
-        }
-    } else if g > r && g > b {
-        // Green dominant
-        if g > 192 && r < 64 && b < 64 {
-            2 // Green
-        } else if g > b {
-            3 // Yellow
-        } else {
-            6 // Cyan
-        }
-    } else {
-        // Blue dominant
-        if b > 192 && r < 64 && g < 64 {
-            4 // Blue
-        } else if b > r {
-            6 // Cyan
-        } else {
-            5 // Magenta
-        }
-    };
+    // Determine base color using simple thresholding on each channel, producing an index 0..7
+    let r_on = r > 128;
+    let g_on = g > 128;
+    let b_on = b > 128;
+    let base_idx = (r_on as u8) + (g_on as u8) * 2 + (b_on as u8) * 4; // 0..7
 
+    // SGR color codes: 30..37 for normal, 90..97 for bright
     if is_bright {
-        base_color + 8 // Bright colors are 8-15
+        90 + base_idx
     } else {
-        base_color // Normal colors are 0-7
+        30 + base_idx
     }
 }
 
-- 
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