1 files changed, 70 insertions, 0 deletions
diff --git a/src/blind-dissolve.c b/src/blind-dissolve.c
new file mode 100644
index 0000000..83b9091
--- /dev/null
+++ b/src/blind-dissolve.c
@@ -0,0 +1,70 @@
+/* See LICENSE file for copyright and license details. */
+#include "stream.h"
+#include "util.h"
+
+#include <string.h>
+#include <unistd.h>
+
+USAGE("[-r]")
+
+static size_t fm;
+static double fmd;
+
+static void
+process_xyza(struct stream *stream, size_t n, size_t f)
+{
+	size_t i;
+	double a;
+	for (i = 0; i < n; i += stream->pixel_size) {
+		a = ((double *)(stream->buf + i))[3];
+		a = a * (double)f / fmd;
+		((double *)(stream->buf + i))[3] = a;
+	}
+}
+
+static void
+process_xyza_r(struct stream *stream, size_t n, size_t f)
+{
+	size_t i;
+	double a;
+	for (i = 0; i < n; i += stream->pixel_size) {
+		a = ((double *)(stream->buf + i))[3];
+		a = a * (double)(fm - f) / fmd;
+		((double *)(stream->buf + i))[3] = a;
+	}
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct stream stream;
+	int reverse = 0;
+	void (*process)(struct stream *stream, size_t n, size_t f) = NULL;
+
+	ARGBEGIN {
+	case 'r':
+		reverse = 1;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc)
+		usage();
+
+	stream.fd = STDIN_FILENO;
+	stream.file = "<stdin>";
+	einit_stream(&stream);
+	fprint_stream_head(stdout, &stream);
+	efflush(stdout, "<stdout>");
+
+	if (!strcmp(stream.pixfmt, "xyza"))
+		process = reverse ? process_xyza_r : process_xyza;
+	else
+		eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
+
+	fmd = fm = stream.frames - 1;
+	process_each_frame_segmented(&stream, STDOUT_FILENO, "<stdout>", process);
+
+	return 0;
+}