From 28baa52191099820ed2d1d5a33a0d29e50d82033 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Tue, 12 May 2020 00:25:42 +0200
Subject: Added custom character palette

---
 src/character.c | 12 +++++++-----
 src/character.h |  8 +++++---
 src/main.c      | 22 ++++++++++------------
 3 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/src/character.c b/src/character.c
index 658f0be..8a42370 100644
--- a/src/character.c
+++ b/src/character.c
@@ -1,10 +1,12 @@
 #include "character.h"
 
-const char character_luminance_map [] = {' ', ' ', '.', ',', '`', '-', '~', '"', '*', ':', ';', '<', '!', '/', '?', '%', '&', '=', '$', '#'};
-//const char map[] = {' ', '`', '.', ',', ':', ';', '\"', '+', '#', '@'};
+const char *default_character_map="  .,-~\"*:;<!/?%&=$#";
+//const char *default_character_map=" `.,:;/+#@";
 
-char calc_char(uint8_t _c , uint8_t _min, uint8_t _max)
+char calc_char(uint8_t _c , uint8_t _min, uint8_t _max, char *_custom_map)
 {
-  float c = (float)(_c) / (_max - _min);
-  return character_luminance_map [(int)((sizeof(character_luminance_map)-1) * (c))];
+	const char *map = _custom_map == 0 ? default_character_map : _custom_map;
+
+	float c = (float)(_c) / (_max - _min);
+	return map [(int)( strlen( map ) * (c))];
 }
diff --git a/src/character.h b/src/character.h
index 7e17cd7..be6af41 100644
--- a/src/character.h
+++ b/src/character.h
@@ -2,11 +2,13 @@
 #define _CHARACTER_H_
 
 #include <stdint.h>
+#include <string.h>
 
 //Both maps produce very different results
-const char character_luminance_map [] ;
+const char *default_character_map;
 
-//Select Char based on 1B brightness Value
-char calc_char(uint8_t _c, uint8_t _min, uint8_t _max);
+//Select Char based on 1B brightness Value.
+//if _custom_map == NULL default map is used
+char calc_char(uint8_t _c, uint8_t _min, uint8_t _max, char *_custom_map);
 
 #endif //_CHARACTER_H_
diff --git a/src/main.c b/src/main.c
index 1ca92e1..267f08d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -22,6 +22,7 @@
 struct prog_param
 {
 	char *filename;
+	char *character_map;
 	unsigned int charsize_x;
 	unsigned int charsize_y;
 	uint8_t color;
@@ -153,7 +154,7 @@ int main(int argc, char *argv[])
 			if(args.use_whitespace)
 				printf(" ");
 			else
-				printf("%c", calc_char(ascii_buff[x][y], b_min, b_max));
+				printf("%c", calc_char(ascii_buff[x][y], b_min, b_max, args.character_map));
 		}
 		printf("\e[0m\n");
 	}
@@ -186,7 +187,6 @@ struct prog_param parse_args(int argc, char *argv[])
 
 	memset(&ret, 0, sizeof ret);
 
-	ret.filename = NULL;
 	ret.charsize_x = CHAR_SIZE_X;
 
 	for (int i = 1; i < argc; i++) {
@@ -196,17 +196,13 @@ struct prog_param parse_args(int argc, char *argv[])
 				switch(argv[icpy][o]) {
 					case 'h':
 						print_help();
-						exit(1);
+						exit(0);
 						break;
 					case 'x':
-						DEBUG_PRINTF("x\n");
-						i++;
-						ret.charsize_x = atoi(argv[i]);
+						ret.charsize_x = atoi(argv[++i]);
 						break;
 					case 'y':
-						DEBUG_PRINTF("y\n");
-						i++;
-						ret.charsize_y = atoi(argv[i]);
+						ret.charsize_y = atoi(argv[++i]);
 						break;
 					case 'c':
 						ret.color = 1;
@@ -218,12 +214,14 @@ struct prog_param parse_args(int argc, char *argv[])
 						ret.use_whitespace = 1;
 						break;
 					case 's':
-						i++;
-						ret.fit_width = atoi(argv[i]);
+						ret.fit_width = atoi(argv[++i]);
 						break;
 					case 'd':
 						ret.dynamic_range = 1;
 						break;
+					case 'm':
+						ret.character_map = argv[++i];
+						break;
 					default:
 						printf("Unrecognized Option '%c'\n", argv[icpy][o]);
 						print_help();
@@ -260,7 +258,7 @@ void print_help( void )
 	printf("Options:\n	-h: Print this help message\n	-x VAL: set the width of block wich makes up one character. Default: %i\n", CHAR_SIZE_X);
 	printf("	-y VAL: set the height of block wich makes up one character. Default: 2*x\n	-c: Print in ANSI color mode. Default: OFF\n");
 	printf("	-i: Read from STDIN instead of file.\n	-w: print only whitespaces with background color\n");
-	printf("	-d: Dynamic brightness range");
+	printf("	-d: Dynamic brightness range\n	-m PALETTE: specify custom character palette from darkest to brightest\n");
 }
 
 
-- 
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