From 41bf4f1ced8b8357c0c3f1c482afece9e37ee77a Mon Sep 17 00:00:00 2001
From: Peter Wu <lekensteyn@gmail.com>
Date: Sun, 30 Sep 2012 15:35:54 +0200
Subject: makexpm: generate XPM file from width, height, ncolors and cpp

---
 makexpm.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 makexpm.c

diff --git a/makexpm.c b/makexpm.c
new file mode 100644
index 0000000..262ba84
--- /dev/null
+++ b/makexpm.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* chars to use for colors */
+static const char p[] = "0123456789"
+"abcdefghijklmnopqrstuvwxyz"
+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+"!@#$%^&*()_+-=`~[]{}|;:',<.>/? ";
+/* number of chars excl NIL */
+static const int q = sizeof(p) - 1;
+
+int main(int argc, char **argv) {
+	unsigned int width, height, ncolors, cpp, i, j;
+	if (argc != 5) {
+		fprintf(stderr, "Usage: %s width height ncolors cpp\n", argv[0]);
+		return 1;
+	}
+	/*
+	width = 1600;
+	height = 900;
+	ncolors = width * height / 1024;
+	cpp = 3;
+	*/
+
+	width = strtoul(argv[1], NULL, 0);
+	height= strtoul(argv[2], NULL, 0);
+	ncolors=strtoul(argv[3], NULL, 0);
+	cpp   = strtoul(argv[4], NULL, 0);
+
+	printf(
+		"/* XPM */\n"
+		"static char *picture[] = {\n"
+		"/* columns rows colors chars-per-pixel */\n"
+		"\"%d %d %d %d \",\n"
+		, width, height, ncolors, cpp);
+
+
+	const char *fmt;
+	switch (cpp) {
+	case 1: fmt = "%c"; break;
+	case 2: fmt = "%c%c"; break;
+	case 3: fmt = "%c%c%c"; break;
+	default:fmt = "%c%c%c%c"; break;
+	}
+	for (i = 0; i<ncolors; ++i) {
+		putchar('"');
+		printf(fmt, p[i%q], p[i/q%q], p[i/q/q%q], p[i/q/q/q%q]);
+		printf(" c #%06x\",\n", 256 * 256 * 256 * i / ncolors);
+	}
+
+	puts("/* pixels */");
+	for (i = 0; i<height; ++i) {
+		putchar('"');
+		for (j = 0; j<width; ++j) {
+			unsigned int n = (i * width + j) % ncolors;
+			printf(fmt, p[n%q], p[n/q%q], p[n/q/q%q], p[n/q/q/q%q]);
+		}
+		if (i < height - 1) puts("\",");
+		else puts("\"");
+	}
+	puts("};");
+	return 0;
+}
-- 
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