Add text rendering support to wayland clients

1 files changed, 59 insertions, 0 deletions

diff --git a/wayland/pango.c b/wayland/pango.c
new file mode 100644
index 00000000..9766be6a
--- /dev/null
+++ b/wayland/pango.c
@@ -0,0 +1,59 @@
+#include <cairo/cairo.h>
+#include <pango/pangocairo.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "client/window.h"
+#include "client/buffer.h"
+#include "log.h"
+
+PangoLayout *get_pango_layout(struct window *window, const char *text) {
+	PangoLayout *layout = pango_cairo_create_layout(window->cairo);
+	pango_layout_set_text(layout, text, -1);
+	PangoFontDescription *desc = pango_font_description_from_string(window->font);
+	pango_layout_set_font_description(layout, desc);
+	pango_layout_set_single_paragraph_mode(layout, 1);
+	pango_font_description_free(desc);
+	return layout;
+}
+
+void get_text_size(struct window *window, int *width, int *height, const char *fmt, ...) {
+	char *buf = malloc(2048);
+
+	va_list args;
+	va_start(args, fmt);
+	if (vsnprintf(buf, 2048, fmt, args) >= 2048) {
+		strcpy(buf, "[buffer overflow]");
+	}
+	va_end(args);
+
+	PangoLayout *layout = get_pango_layout(window, buf);
+	pango_cairo_update_layout(window->cairo, layout);
+
+	pango_layout_get_pixel_size(layout, width, height);
+
+	g_object_unref(layout);
+
+	free(buf);
+}
+
+void pango_printf(struct window *window, const char *fmt, ...) {
+	char *buf = malloc(2048);
+
+	va_list args;
+	va_start(args, fmt);
+	if (vsnprintf(buf, 2048, fmt, args) >= 2048) {
+		strcpy(buf, "[buffer overflow]");
+	}
+	va_end(args);
+
+	PangoLayout *layout = get_pango_layout(window, buf);
+	pango_cairo_update_layout(window->cairo, layout);
+
+	pango_cairo_show_layout(window->cairo, layout);
+
+	g_object_unref(layout);
+
+	free(buf);
+}