From fbdde8d16cc22809affd317d621fceaf0c289bb5 Mon Sep 17 00:00:00 2001
From: Yves Rizoud <yrizoud@gmail.com>
Date: Sun, 30 Sep 2012 16:25:52 +0000
Subject: [PATCH] Issue 490: color 255 selected FG by default

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@2021 416bcca6-2ee7-4201-b75f-2eb2f807beb1
---
 src/main.c    | 10 ++++++++--
 src/windows.c | 41 +++++++++++++++++++++++++++++++++++++++++
 src/windows.h |  1 +
 3 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/src/main.c b/src/main.c
index 84fa65c4..921548a6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -707,8 +707,8 @@ int Init_program(int argc,char * argv[])
 
   memcpy(Main_palette, Gfx->Default_palette, sizeof(T_Palette));
 
-  Fore_color=Best_color_nonexcluded(255,255,255);
-  Back_color=Best_color_nonexcluded(0,0,0);
+  Fore_color=Best_color_range(255,255,255,Config.Palette_cells_X*Config.Palette_cells_Y);
+  Back_color=Best_color_range(0,0,0,Config.Palette_cells_X*Config.Palette_cells_Y);
 
   // Allocation de mémoire pour la brosse
   if (!(Brush         =(byte *)malloc(   1*   1))) Error(ERROR_MEMORY);
@@ -878,6 +878,12 @@ int Init_program(int argc,char * argv[])
           
           Hide_cursor();
           Compute_optimal_menu_colors(Main_palette);
+          Back_color=Main_backups->Pages->Background_transparent ?
+            Main_backups->Pages->Transparent_color :
+            Best_color_range(0,0,0,Config.Palette_cells_X*Config.Palette_cells_Y);
+          Fore_color=Main_palette[Back_color].R+Main_palette[Back_color].G+Main_palette[Back_color].B < 3*127 ?
+            Best_color_range(255,255,255,Config.Palette_cells_X*Config.Palette_cells_Y) :
+            Best_color_range(0,0,0,Config.Palette_cells_X*Config.Palette_cells_Y);  
           Check_menu_mode();
           Display_all_screen();
           Display_menu();
diff --git a/src/windows.c b/src/windows.c
index 0ac12d9a..2f2e9e19 100644
--- a/src/windows.c
+++ b/src/windows.c
@@ -2702,7 +2702,48 @@ byte Best_color_nonexcluded(byte red,byte green,byte blue)
   return best_color;
 }
 
+byte Best_color_range(byte r, byte g, byte b, byte max)
+{
+  
+  int col;  
+  float best_diff=255.0*1.56905;
+  byte  best_color=0;
+  float target_bri;
+  float bri;
+  float diff_b, diff_c, diff;
 
+  // Similar to Perceptual_lightness();
+  target_bri = sqrt(0.26*r*0.26*r + 0.55*g*0.55*g + 0.19*b*0.19*b);
+  
+  for (col=0; col<max; col++)
+  {
+    if (Exclude_color[col])
+      continue;
+
+    diff_c = sqrt(
+      (0.26*(Main_palette[col].R-r))*
+      (0.26*(Main_palette[col].R-r))+
+      (0.55*(Main_palette[col].G-g))*
+      (0.55*(Main_palette[col].G-g))+
+      (0.19*(Main_palette[col].B-b))*
+      (0.19*(Main_palette[col].B-b)));
+    // Exact match
+    if (diff_c==0)
+      return col;
+
+    bri = sqrt(0.26*Main_palette[col].R*0.26*Main_palette[col].R + 0.55*Main_palette[col].G*0.55*Main_palette[col].G + 0.19*Main_palette[col].B*0.19*Main_palette[col].B);
+    diff_b = abs(target_bri-bri);
+
+    diff=0.25*(diff_b-diff_c)+diff_c;
+    if (diff<best_diff)
+    {
+      best_diff=diff;
+      best_color=col;
+    } 
+  }
+
+  return best_color;
+}
 
 byte Best_color_perceptual(byte r,byte g,byte b)
 {
diff --git a/src/windows.h b/src/windows.h
index 53009743..c0f3e6e8 100644
--- a/src/windows.h
+++ b/src/windows.h
@@ -99,6 +99,7 @@ void Window_display_icon_sprite(word x_pos,word y_pos,byte type);
 
 byte Best_color(byte red,byte green,byte blue);
 byte Best_color_nonexcluded(byte red,byte green,byte blue);
+byte Best_color_range(byte red,byte green,byte blue,byte max);
 byte Best_color_perceptual(byte r,byte g,byte b);
 byte Best_color_perceptual_except(byte r,byte g,byte b, byte except);
 byte Best_color_perceptual_weighted(byte r,byte g,byte b, float weight);