1 files changed, 81 insertions, 0 deletions
diff --git a/src/vu-single-colour.c b/src/vu-single-colour.c
new file mode 100644
index 0000000..19fa768
--- /dev/null
+++ b/src/vu-single-colour.c
@@ -0,0 +1,81 @@
+/* See LICENSE file for copyright and license details. */
+#include "arg.h"
+#include "util.h"
+
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-f frames] -w width -h height red green blue [alpha]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int red, green, blue, alpha = 255;
+	size_t width = 0, height = 0, frames = 1;
+	unsigned char pixel[4];
+	size_t x, y, n;
+	int32_t buf[1024];
+	ssize_t r;
+
+	ARGBEGIN {
+	case 'f':
+		if (tozu(EARGF(usage()), 1, SIZE_MAX, &frames))
+			eprintf("argument of -f must be an integer in [1, %zu]\n", SIZE_MAX);
+		break;
+	case 'w':
+		if (tozu(EARGF(usage()), 1, SIZE_MAX, &width))
+			eprintf("argument of -w must be an integer in [1, %zu]\n", SIZE_MAX);
+		break;
+	case 'h':
+		if (tozu(EARGF(usage()), 1, SIZE_MAX, &height))
+			eprintf("argument of -h must be an integer in [1, %zu]\n", SIZE_MAX);
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (!width || !height || argc < 3 || argc > 4)
+		usage();
+
+	if (toi(argv[0], 0, 255, &red))
+		eprintf("the red value must be an integer in [0, 255]\n");
+	if (toi(argv[1], 0, 255, &green))
+		eprintf("the green value must be an integer in [0, 255]\n");
+	if (toi(argv[2], 0, 255, &blue))
+		eprintf("the blue value must be an integer in [0, 255]\n");
+	if (argc > 3 && toi(argv[3], 0, 255, &alpha))
+		eprintf("the alpha value must be an integer in [0, 255]\n");
+
+	pixel[0] = (unsigned char)red;
+	pixel[1] = (unsigned char)green;
+	pixel[2] = (unsigned char)blue;
+	pixel[3] = (unsigned char)alpha;
+
+	for (x = 0; x < ELEMENTSOF(buf); x++)
+		buf[x] = *(int32_t *)(void *)pixel;
+	while (frames--) {
+		for (y = height; y--;) {
+			for (x = width; x;) {
+				n = ELEMENTSOF(buf) < x ? ELEMENTSOF(buf) : x;
+				x -= n;
+				n *= sizeof(*buf);
+				while (n) {
+					r = write(STDOUT_FILENO, buf, n);
+					if (r < 0)
+						eprintf("write <stdout>:");
+					n -= (size_t)r;
+				}
+			}
+		}
+	}
+
+	efshut(stdout, "<stdout>");
+	return 0;
+}