From 47e6e7fa23df7cdde3f1e77bd401c898d3330861 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Thu, 23 Oct 2014 09:22:17 +0200
Subject: Use a real indexed palette

Instead of copying attributes from the screen.

And other minor changes, e.g. don't select a colour when the mouse
is dragged over the palette, instead of clicking on it.
---
 autistdraw.c | 71 ++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 43 insertions(+), 28 deletions(-)

diff --git a/autistdraw.c b/autistdraw.c
index ace5e14..effd220 100644
--- a/autistdraw.c
+++ b/autistdraw.c
@@ -16,17 +16,25 @@
 
 #include "config.h"
 
-typedef struct app_data app_data_t;
-struct app_data
+#define PALETTE_WIDTH 9                 ///< Width of the palette
+
+typedef struct app_context app_context_t;
+struct app_context
 {
-	termo_t *tk;
+	termo_t *tk;                        ///< Termo instance
+
+	chtype palette[2 * 9];              ///< Attribute palette
 
-	// Current attributes for the left mouse button
-	int current_attrs_left;
-	// Current attributes for the right mouse button
-	int current_attrs_right;
+	uint8_t current_color_left;         ///< Left mouse button color
+	uint8_t current_color_right;        ///< Right mouse button color
 };
 
+static void
+app_init (app_context_t *self)
+{
+	memset (self, 0, sizeof *self);
+}
+
 static int g_winch_pipe[2];
 
 static void
@@ -46,7 +54,7 @@ display (const char *format, ...)
 }
 
 static void
-init_palette (app_data_t *app)
+init_palette (app_context_t *app)
 {
 	start_color ();
 
@@ -63,13 +71,19 @@ init_palette (app_data_t *app)
 		init_pair (10 + i, COLOR_BLACK + i, COLOR_WHITE);
 	}
 
+	// Initialize the palette of characters with attributes
+	for (int i = 0; i < PALETTE_WIDTH; i++)
+	{
+		app->palette[i]     = ' ' | COLOR_PAIR (i);
+		app->palette[i + 9] = ' ' | COLOR_PAIR (i + 9) | A_REVERSE | A_BOLD;
+	}
+
 	// This usually creates a solid black or white.
-	app->current_attrs_left =
-	app->current_attrs_right = COLOR_PAIR (9) | A_REVERSE | A_BOLD;
+	app->current_color_left = app->current_color_right = 9;
 }
 
 static void
-redraw (void)
+redraw (app_context_t *app)
 {
 	int i;
 
@@ -78,9 +92,9 @@ redraw (void)
 
 	for (i = 0; i < COLS; i++)
 	{
-		int pair = (float) i / COLS  * 9;
-		mvaddch (1, i, ' ' | COLOR_PAIR (pair));
-		mvaddch (2, i, ' ' | COLOR_PAIR (pair + 9) | A_REVERSE | A_BOLD);
+		int pair = (float) i / COLS * PALETTE_WIDTH;
+		mvaddch (1, i, app->palette[pair]);
+		mvaddch (2, i, app->palette[pair + PALETTE_WIDTH]);
 	}
 
 	display ("Choose a color from the palette and draw.  "
@@ -89,7 +103,7 @@ redraw (void)
 }
 
 static bool
-on_key (app_data_t *app, termo_key_t *key)
+on_key (app_context_t *app, termo_key_t *key)
 {
 	if (key->type == TERMO_TYPE_KEYSYM
 	 && key->code.sym == TERMO_SYM_ESCAPE)
@@ -110,24 +124,25 @@ on_key (app_data_t *app, termo_key_t *key)
 	if (event != TERMO_MOUSE_PRESS && event != TERMO_MOUSE_DRAG)
 		return true;
 
-	int *attrs;
+	uint8_t *color;
 	if (button == 1)
-		attrs = &app->current_attrs_left;
+		color = &app->current_color_left;
 	else if (button == 3)
-		attrs = &app->current_attrs_right;
+		color = &app->current_color_right;
 	else
 		return true;
 
-	chtype ch = mvwinch (stdscr, line, col);
+	move (line, col);
 	if (line >= 3)
 	{
-		// Paste the attributes where the user clicked.
-		addch (' ' | *attrs);
+		addch (app->palette[*color]);
 		refresh ();
 	}
-	else if (line > 0)
-		// Copy attributes from the pallete.
-		*attrs = ch & (A_COLOR | A_ATTRIBUTES);
+	else if (line > 0 && event != TERMO_MOUSE_DRAG)
+	{
+		int pair = (float) col / COLS * PALETTE_WIDTH;
+		*color = pair + (line - 1) * PALETTE_WIDTH;
+	}
 
 	return true;
 }
@@ -177,12 +192,12 @@ main (int argc, char *argv[])
 		exit (EXIT_FAILURE);
 	}
 
-	app_data_t app;
-	memset (&app, 0, sizeof app);
+	app_context_t app;
+	app_init (&app);
 	app.tk = tk;
 
 	init_palette (&app);
-	redraw ();
+	redraw (&app);
 
 	termo_result_t ret;
 	termo_key_t key;
@@ -213,7 +228,7 @@ main (int argc, char *argv[])
 			endwin ();
 			refresh ();
 
-			redraw ();
+			redraw (&app);
 		}
 		if (fds[0].revents & (POLLIN | POLLHUP | POLLERR))
 			termo_advisereadable (tk);
-- 
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