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, 19 insertions, 0 deletions

diff --git a/src/entry_backend/pango.h b/src/entry_backend/pango.h
new file mode 100644
index 0000000..08572ae
--- /dev/null
+++ b/src/entry_backend/pango.h
@@ -0,0 +1,19 @@
+#ifndef ENTRY_BACKEND_PANGO_H
+#define ENTRY_BACKEND_PANGO_H
+
+#include <pango/pangocairo.h>
+
+struct entry;
+
+struct entry_backend {
+	PangoContext *context;
+	PangoLayout *prompt_layout;
+	PangoLayout *entry_layout;
+	PangoLayout *result_layouts[5];
+};
+
+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_PANGO_H */