Add Harfbuzz backend.

Another source of slow startup is initialising Pango. If the user
supplies a ttf file, we can skip any Pango stuff and use Harfbuzz
directly with Cairo to do our font rendering, providing a large speedup.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/entry_backend/harfbuzz.h b/src/entry_backend/harfbuzz.h
new file mode 100644
index 0000000..0b07538
--- /dev/null
+++ b/src/entry_backend/harfbuzz.h
@@ -0,0 +1,26 @@
+#ifndef ENTRY_BACKEND_HARFBUZZ_H
+#define ENTRY_BACKEND_HARFBUZZ_H
+
+#include <cairo/cairo-ft.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include <harfbuzz/hb.h>
+#include <pango/pangocairo.h>
+
+struct entry;
+
+struct entry_backend {
+	FT_Library ft_library;
+	FT_Face ft_face;
+
+	cairo_font_face_t *cairo_face;
+
+	hb_font_t *hb_font;
+	hb_buffer_t *hb_buffer;
+};
+
+void entry_backend_init(struct entry *entry, uint32_t width, uint32_t height, uint32_t scale);
+void entry_backend_destroy(struct entry *entry);
+void entry_backend_update(struct entry *entry);
+
+#endif /* ENTRY_BACKEND_HARFBUZZ_H */