From dec8e9006193908c9fb8fd32de2a9c15cdb05aaf Mon Sep 17 00:00:00 2001
From: Gwenhael Le Moine <gwenhael.le.moine@gmail.com>
Date: Thu, 5 Sep 2024 13:06:39 +0200
Subject: [PATCH] add a channel to colors and add TRANSPARENT

---
 src/ui.c       | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/ui_inner.h |  5 +++--
 src/ui_sdl2.c  |  6 +++---
 3 files changed, 64 insertions(+), 5 deletions(-)

diff --git a/src/ui.c b/src/ui.c
index a1297b6..231a581 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -147,6 +147,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 255,
      .g = 255,
      .b = 255,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 255,
      },
@@ -155,6 +156,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 255,
      .g = 166,
      .b = 0,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 230,
      },
@@ -163,6 +165,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 0,
      .g = 210,
      .b = 255,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 169,
      },
@@ -171,6 +174,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 109,
      .g = 93,
      .b = 93,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 91,
      },
@@ -179,6 +183,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 90,
      .g = 77,
      .b = 77,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 81,
      },
@@ -187,6 +192,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 76,
      .g = 65,
      .b = 65,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 69,
      },
@@ -195,6 +201,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 202,
      .g = 221,
      .b = 92,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 205,
      },
@@ -203,6 +210,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 0,
      .g = 0,
      .b = 128,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 20,
      },
@@ -211,6 +219,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 109,
      .g = 78,
      .b = 78,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 88,
      },
@@ -219,6 +228,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 90,
      .g = 64,
      .b = 64,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 73,
      },
@@ -227,6 +237,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 76,
      .g = 54,
      .b = 54,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 60,
      },
@@ -235,6 +246,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 155,
      .g = 118,
      .b = 84,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 124,
      },
@@ -243,6 +255,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 124,
      .g = 94,
      .b = 67,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 99,
      },
@@ -251,6 +264,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 100,
      .g = 75,
      .b = 53,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 79,
      },
@@ -259,6 +273,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 204,
      .g = 169,
      .b = 107,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 172,
      },
@@ -267,6 +282,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 64,
      .g = 64,
      .b = 64,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 65,
      },
@@ -275,6 +291,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 202,
      .g = 184,
      .b = 144,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 185,
      },
@@ -283,6 +300,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 0,
      .g = 0,
      .b = 0,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 0,
      },
@@ -291,6 +309,7 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 60,
      .g = 42,
      .b = 42,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 48,
      },
@@ -299,6 +318,16 @@ color_t colors_sx[ NB_COLORS ] = {
      .r = 0,
      .g = 0,
      .b = 0,
+     .a = 255,
+     .mono_rgb = 0,
+     .gray_rgb = 0,
+     },
+    {
+     .name = "transparent",
+     .r = 0,
+     .g = 0,
+     .b = 0,
+     .a = 0,
      .mono_rgb = 0,
      .gray_rgb = 0,
      },
@@ -310,6 +339,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 255,
      .g = 255,
      .b = 255,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 255,
      },
@@ -318,6 +348,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 255,
      .g = 186,
      .b = 255,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 220,
      },
@@ -326,6 +357,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 0,
      .g = 255,
      .b = 204,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 169,
      },
@@ -334,6 +366,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 104,
      .g = 104,
      .b = 104,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 104,
      },
@@ -342,6 +375,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 88,
      .g = 88,
      .b = 88,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 88,
      },
@@ -350,6 +384,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 74,
      .g = 74,
      .b = 74,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 74,
      },
@@ -358,6 +393,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 202,
      .g = 221,
      .b = 92,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 205,
      },
@@ -366,6 +402,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 0,
      .g = 0,
      .b = 128,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 20,
      },
@@ -374,6 +411,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 88,
      .g = 88,
      .b = 88,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 88,
      },
@@ -382,6 +420,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 74,
      .g = 74,
      .b = 74,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 74,
      },
@@ -390,6 +429,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 64,
      .g = 64,
      .b = 64,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 64,
      },
@@ -398,6 +438,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 128,
      .g = 128,
      .b = 138,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 128,
      },
@@ -406,6 +447,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 104,
      .g = 104,
      .b = 110,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 104,
      },
@@ -414,6 +456,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 84,
      .g = 84,
      .b = 90,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 84,
      },
@@ -422,6 +465,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 176,
      .g = 176,
      .b = 184,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 176,
      },
@@ -430,6 +474,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 104,
      .g = 104,
      .b = 110,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 104,
      },
@@ -438,6 +483,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 240,
      .g = 240,
      .b = 240,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 240,
      },
@@ -446,6 +492,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 0,
      .g = 0,
      .b = 0,
+     .a = 255,
      .mono_rgb = 255,
      .gray_rgb = 0,
      },
@@ -454,6 +501,7 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 104,
      .g = 104,
      .b = 110,
+     .a = 255,
      .mono_rgb = 0,
      .gray_rgb = 104,
      },
@@ -462,6 +510,16 @@ color_t colors_gx[ NB_COLORS ] = {
      .r = 0,
      .g = 0,
      .b = 0,
+     .a = 255,
+     .mono_rgb = 0,
+     .gray_rgb = 0,
+     },
+    {
+     .name = "transparent",
+     .r = 0,
+     .g = 0,
+     .b = 0,
+     .a = 0,
      .mono_rgb = 0,
      .gray_rgb = 0,
      },
diff --git a/src/ui_inner.h b/src/ui_inner.h
index eaf2dda..7dc5a24 100644
--- a/src/ui_inner.h
+++ b/src/ui_inner.h
@@ -24,9 +24,10 @@
 #define FRAME 17
 #define UNDERLAY 18
 #define BLACK 19
+#define TRANSPARENT 20
 
 #define FIRST_COLOR WHITE
-#define LAST_COLOR BLACK
+#define LAST_COLOR TRANSPARENT
 #define NB_COLORS ( LAST_COLOR + 1 )
 
 /***********/
@@ -39,7 +40,7 @@ typedef struct letter_t {
 
 typedef struct color_t {
     const char* name;
-    int r, g, b;
+    int r, g, b, a;
     int mono_rgb;
     int gray_rgb;
 } color_t;
diff --git a/src/ui_sdl2.c b/src/ui_sdl2.c
index e299a22..ac2f533 100644
--- a/src/ui_sdl2.c
+++ b/src/ui_sdl2.c
@@ -110,13 +110,13 @@ static SDL_Texture* bitmap_to_texture( unsigned int w, unsigned int h, unsigned
 
 static void __draw_pixel( int x, int y, int color )
 {
-    SDL_SetRenderDrawColor( renderer, colors[ color ].r, colors[ color ].g, colors[ color ].b, 255 );
+    SDL_SetRenderDrawColor( renderer, colors[ color ].r, colors[ color ].g, colors[ color ].b, colors[ color ].a );
     SDL_RenderDrawPoint( renderer, x, y );
 }
 
 static void __draw_line( int x1, int y1, int x2, int y2, int color )
 {
-    SDL_SetRenderDrawColor( renderer, colors[ color ].r, colors[ color ].g, colors[ color ].b, 255 );
+    SDL_SetRenderDrawColor( renderer, colors[ color ].r, colors[ color ].g, colors[ color ].b, colors[ color ].a );
     SDL_RenderDrawLine( renderer, x1, y1, x2, y2 );
 }
 
@@ -128,7 +128,7 @@ static void __draw_rect( int x, int y, int w, int h, int color )
     rect.w = w;
     rect.h = h;
 
-    SDL_SetRenderDrawColor( renderer, colors[ color ].r, colors[ color ].g, colors[ color ].b, 255 );
+    SDL_SetRenderDrawColor( renderer, colors[ color ].r, colors[ color ].g, colors[ color ].b, colors[ color ].a );
     SDL_RenderFillRect( renderer, &rect );
 }