Add gradients

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 77 insertions, 0 deletions

diff --git a/src/blind-coordinate-field.c b/src/blind-coordinate-field.c
new file mode 100644
index 0000000..2d73399
--- /dev/null
+++ b/src/blind-coordinate-field.c
@@ -0,0 +1,77 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+USAGE("[-f frames | -f 'inf'] [-F pixel-format] -w width -h height")
+
+static struct stream stream = { .width = 0, .height = 0, .frames = 1 };
+static int inf = 0;
+
+#define PROCESS(TYPE)\
+	do {\
+		TYPE buf[4] = {0, 0, 0, 0};\
+		size_t x, y;\
+		\
+		while (inf || stream.frames--) {\
+			for (y = 0; y < stream.height; y++) {\
+				buf[1] = (TYPE)y;\
+				for (x = 0; x < stream.width; x++) {\
+					buf[0] = (TYPE)x;\
+					if (write(STDOUT_FILENO, buf, sizeof(buf)) < 0)\
+						eprintf("write <stdout>:");\
+				}\
+			}\
+		}\
+	} while (0)
+
+static void process_lf(void) {PROCESS(double);}
+static void process_f(void) {PROCESS(float);}
+
+int
+main(int argc, char *argv[])
+{
+	char *arg;
+	const char *pixfmt = "xyza";
+	void (*process)(void);
+
+	ARGBEGIN {
+	case 'f':
+		arg = UARGF();
+		if (!strcmp(arg, "inf"))
+			inf = 1, stream.frames = 0;
+		else
+			stream.frames = etozu_flag('f', arg, 1, SIZE_MAX);
+		break;
+	case 'F':
+		pixfmt = UARGF();
+		break;
+	case 'w':
+		stream.width = etozu_flag('w', UARGF(), 1, SIZE_MAX);
+		break;
+	case 'h':
+		stream.height = etozu_flag('h', UARGF(), 1, SIZE_MAX);
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (!stream.width || !stream.height || argc)
+		usage();
+
+	if (inf)
+		einf_check_fd(STDOUT_FILENO, "<stdout>");
+
+	pixfmt = get_pixel_format(pixfmt, "xyza");
+	if (!strcmp(pixfmt, "xyza"))
+		process = process_lf;
+	else if (!strcmp(pixfmt, "xyza f"))
+		process = process_f;
+	else
+		eprintf("pixel format %s is not supported, try xyza\n", pixfmt);
+
+	strcpy(stream.pixfmt, pixfmt);
+	fprint_stream_head(stdout, &stream);
+	efflush(stdout, "<stdout>");
+
+	process();
+	return 0;
+}