--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libui/ui/debug.c	Thu Oct 15 10:32:18 2020 +0200
@@ -0,0 +1,82 @@
+/*
+ * debug.c -- debugging interfaces
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * 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 <assert.h>
+#include <stdio.h>
+
+#include <core/texture.h>
+
+#include "debug.h"
+#include "theme.h"
+
+#define PADDING_X 5
+#define PADDING_Y 5
+
+struct debug_options debug_options = {
+#if !defined(NDEBUG)
+	.enable = true
+#endif
+};
+
+void
+debug_printf(struct debug_report *report, const char *fmt, ...)
+{
+	assert(report);
+	assert(fmt);
+
+	if (!debug_options.enable)
+		return;
+
+	va_list ap;
+
+	va_start(ap, fmt);
+	debug_vprintf(report, fmt, ap);
+	va_end(ap);
+}
+
+void
+debug_vprintf(struct debug_report *report, const char *fmt, va_list ap)
+{
+	assert(report);
+	assert(fmt);
+
+	if (!debug_options.enable)
+		return;
+
+	char line[DEBUG_LINE_MAX];
+	struct theme *theme;
+	struct font *font;
+	struct texture tex;
+	unsigned int gapy;
+
+	vsnprintf(line, sizeof (line), fmt, ap);
+
+	theme = report->theme ? report->theme : theme_default();
+	font = theme->fonts[THEME_FONT_DEBUG];
+	font->color = report->color;
+
+	if (!font_render(font, &tex, line))
+		return;
+
+	gapy = (PADDING_Y * (report->count)) +
+	    (font_height(font) * (report->count));
+	report->count++;
+
+	texture_draw(&tex, PADDING_X, gapy);
+	texture_finish(&tex);
+}