From d7230fee0df687267fb6c29b5bb8b577de21ce4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=99emysl=20Eric=20Janouch?= <p@janouch.name>
Date: Mon, 20 Sep 2021 01:43:25 +0200
Subject: [PATCH] Add a basic benchmarking tool

---
 fastiv-io-benchmark.c | 65 +++++++++++++++++++++++++++++++++++++++++++
 meson.build           |  8 ++++++
 2 files changed, 73 insertions(+)
 create mode 100644 fastiv-io-benchmark.c

diff --git a/fastiv-io-benchmark.c b/fastiv-io-benchmark.c
new file mode 100644
index 0000000..6899b3e
--- /dev/null
+++ b/fastiv-io-benchmark.c
@@ -0,0 +1,65 @@
+//
+// fastiv-io-benchmark.c: see if we're worth the name
+//
+// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+
+#include <time.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "fastiv-view.h"
+
+static double
+timestamp(void)
+{
+	struct timespec ts;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return ts.tv_sec + ts.tv_nsec / 1.e9;
+}
+
+static void
+one_file(const char *filename)
+{
+	double since_us = timestamp();
+	cairo_surface_t *loaded_by_us = fastiv_io_open(filename, NULL);
+	if (!loaded_by_us)
+		return;
+
+	cairo_surface_destroy(loaded_by_us);
+	double us = timestamp() - since_us;
+
+	double since_pixbuf = timestamp();
+	GdkPixbuf *gdk_pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
+	if (!gdk_pixbuf)
+		return;
+
+	cairo_surface_t *loaded_by_pixbuf =
+		gdk_cairo_surface_create_from_pixbuf(gdk_pixbuf, 1, NULL);
+	g_object_unref(gdk_pixbuf);
+	cairo_surface_destroy(loaded_by_pixbuf);
+	double pixbuf = timestamp() - since_pixbuf;
+
+	printf("%f\t%f\t%.0f%%\t%s\n", us, pixbuf, us / pixbuf * 100, filename);
+}
+
+int
+main(int argc, char *argv[])
+{
+	// Needed for gdk_cairo_surface_create_from_pixbuf().
+	gdk_init(&argc, &argv);
+
+	for (int i = 1; i < argc; i++)
+		one_file(argv[i]);
+	return 0;
+}
diff --git a/meson.build b/meson.build
index deb6b46..c38458d 100644
--- a/meson.build
+++ b/meson.build
@@ -22,6 +22,14 @@ executable('fastiv', 'fastiv.c', 'fastiv-view.c', 'fastiv-io.c',
 	install : true,
 	dependencies : [dependencies])
 
+# TODO(p): See fastiv_io_open(), consider optionally integrating this.
+gdk_pixbuf = dependency('gdk-pixbuf-2.0', required : false)
+if gdk_pixbuf.found()
+	executable('io-benchmark', 'fastiv-io-benchmark.c', 'fastiv-io.c',
+		build_by_default : false,
+		dependencies : [dependencies, gdk_pixbuf])
+endif
+
 install_data('fastiv.desktop',
 	install_dir : get_option('datadir') + '/applications')
 install_data('fastiv.svg',