1 files changed, 68 insertions, 0 deletions
diff --git a/src/common/backend.h b/src/common/backend.h
new file mode 100644
index 0000000..c1d878b
--- /dev/null
+++ b/src/common/backend.h
@@ -0,0 +1,68 @@
+#ifndef YASL_BACKEND_H
+#define YASL_BACKEND_H
+
+#include "yasl/yasl.h"
+
+struct yasl_backend_ops;
+
+struct yasl_display {
+    const struct yasl_backend_ops *ops;
+};
+
+struct yasl_surface {
+    struct yasl_display *display;
+};
+
+struct yasl_backend_ops {
+    enum yasl_backend type;
+    struct yasl_display *(*display_open)(struct yasl_loop *loop, const struct yasl_display_spec *spec);
+    void (*display_close)(struct yasl_display *d);
+    uint32_t (*display_caps)(const struct yasl_display *d);
+    void (*display_dispatch)(struct yasl_display *d);
+    int (*display_dispatch_timeout)(struct yasl_display *d, int timeout_ms);
+    void (*display_flush)(struct yasl_display *d);
+    int (*display_modifiers)(const struct yasl_display *d);
+    void (*display_copy)(struct yasl_display *d, enum yasl_selection sel, const char *text);
+    void (*display_paste)(struct yasl_display *d, enum yasl_selection sel, struct yasl_surface *target);
+    bool (*display_drag_start)(struct yasl_display *d, struct yasl_surface *origin, const struct yasl_drag_image *image, const struct yasl_drag_listener *l, void *ud);
+    void (*display_drag_cancel)(struct yasl_display *d);
+    struct yasl_surface *(*surface_create_toplevel)(struct yasl_display *d, const struct yasl_surface_spec *spec);
+    struct yasl_surface *(*surface_create_popup)(struct yasl_surface *parent, const struct yasl_popup_spec *spec);
+    bool (*surface_popup_reposition)(struct yasl_surface *popup, const struct yasl_popup_spec *spec);
+    void (*surface_destroy)(struct yasl_surface *s);
+    struct yasl_display *(*surface_display)(const struct yasl_surface *s);
+    void (*surface_set_callbacks)(struct yasl_surface *s, const struct yasl_surface_cbs *cbs, void *ud);
+    void (*surface_set_title)(struct yasl_surface *s, const char *title);
+    void (*surface_schedule_redraw)(struct yasl_surface *s);
+    bool (*surface_present)(struct yasl_surface *s, const struct yasl_framebuffer *fb, const struct yasl_damage_list *damage);
+    bool (*surface_input_poll)(struct yasl_surface *s, struct yasl_input_event *ev);
+    struct yasl_vector2i (*surface_size)(const struct yasl_surface *s);
+    uint32_t (*surface_scale_120)(const struct yasl_surface *s);
+    uint32_t (*surface_state)(const struct yasl_surface *s);
+    struct yasl_timing (*surface_timing)(const struct yasl_surface *s);
+    uint64_t (*surface_frame_time_ns)(struct yasl_surface *s, uint64_t now);
+    void (*surface_set_cursor)(struct yasl_surface *s, enum yasl_cursor cursor);
+    void (*surface_set_background_color)(struct yasl_surface *s, uint32_t bg);
+    const char *(*surface_ime_preedit)(const struct yasl_surface *s);
+    bool (*surface_ime_preedit_cursor)(const struct yasl_surface *s, int *begin, int *end);
+    void (*surface_set_ime_caret)(struct yasl_surface *s, struct yasl_rect2i caret);
+    bool (*surface_start_interactive_move)(struct yasl_surface *s);
+    bool (*surface_start_interactive_resize)(struct yasl_surface *s, enum yasl_resize_edge edge);
+    bool (*surface_show_window_menu)(struct yasl_surface *s, struct yasl_vector2i pos);
+    bool (*surface_drag_carry)(struct yasl_surface *s, struct yasl_vector2i offset);
+    bool (*surface_place_under_pointer)(struct yasl_surface *s, struct yasl_vector2i at);
+    void *(*display_get_native_handle)(struct yasl_display *d);
+    void *(*surface_get_native_handle)(struct yasl_surface *s);
+};
+
+#if YASL_HAS_WAYLAND
+extern const struct yasl_backend_ops yasl_wayland_backend;
+#endif
+#if YASL_HAS_X11
+extern const struct yasl_backend_ops yasl_x11_backend;
+#endif
+#if YASL_HAS_COCOA
+extern const struct yasl_backend_ops yasl_cocoa_backend;
+#endif
+
+#endif