Start port of swaybar to layer shell

This starts up the event loop and wayland display and shims out the
basic top level rendering concepts. Also includes some changes to
incorporate pango into the 1.x codebase properly.

2 files changed, 70 insertions, 0 deletions

diff --git a/common/meson.build b/common/meson.build
index 01736ca6..4ad47077 100644
--- a/common/meson.build
+++ b/common/meson.build
@@ -1,5 +1,7 @@
 deps = [
 	cairo,
+	pango,
+	pangocairo,
 	wlroots
 ]
 
@@ -14,6 +16,7 @@ lib_sway_common = static_library(
 		'ipc-client.c',
 		'log.c',
 		'list.c',
+		'pango.c',
 		'readline.c',
 		'stringop.c',
 		'util.c'
diff --git a/common/pango.c b/common/pango.c
new file mode 100644
index 00000000..212d96cf
--- /dev/null
+++ b/common/pango.c
@@ -0,0 +1,67 @@
+#include <cairo/cairo.h>
+#include <pango/pangocairo.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
+		const char *text, int32_t scale, bool markup) {
+	PangoLayout *layout = pango_cairo_create_layout(cairo);
+	PangoAttrList *attrs;
+	if (markup) {
+		char *buf;
+		pango_parse_markup(text, -1, 0, &attrs, &buf, NULL, NULL);
+		pango_layout_set_markup(layout, buf, -1);
+		free(buf);
+	} else {
+		attrs = pango_attr_list_new();
+		pango_layout_set_text(layout, text, -1);
+	}
+	pango_attr_list_insert(attrs, pango_attr_scale_new(scale));
+	PangoFontDescription *desc = pango_font_description_from_string(font);
+	pango_layout_set_font_description(layout, desc);
+	pango_layout_set_single_paragraph_mode(layout, 1);
+	pango_layout_set_attributes(layout, attrs);
+	pango_attr_list_unref(attrs);
+	pango_font_description_free(desc);
+	return layout;
+}
+
+void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
+		int32_t scale, bool markup, 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(cairo, font, buf, scale, markup);
+	pango_cairo_update_layout(cairo, layout);
+	pango_layout_get_pixel_size(layout, width, height);
+	g_object_unref(layout);
+	free(buf);
+}
+
+void pango_printf(cairo_t *cairo, const char *font,
+		int32_t scale, bool markup, 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(cairo, font, buf, scale, markup);
+	pango_cairo_update_layout(cairo, layout);
+	pango_cairo_show_layout(cairo, layout);
+	g_object_unref(layout);
+	free(buf);
+}