[feat] Layers mangaing

include/graphics/layer.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <efi.h>
+
+#define LAYER_MAX 32
+#define LAYER_NAME_LEN 32
+
+typedef enum {
+    LAYER_TYPE_DESKTOP,
+    LAYER_TYPE_WINDOW,
+    LAYER_TYPE_MOUSE,
+    LAYER_TYPE_OVERLAY,
+} layer_type_t;
+
+typedef struct layer {
+    UINT32 id;
+    char name[LAYER_NAME_LEN];
+    layer_type_t type;
+    int x, y;
+    UINT32 w, h;
+    int z;
+    bool visible;
+    EFI_GRAPHICS_OUTPUT_BLT_PIXEL* buffer;
+    struct layer* next;
+} layer_t;
+
+// Initialization — allocates back buffer, registers keyboard handler
+void layer_init(void);
+
+// Layer management
+layer_t* layer_create(const char* name, layer_type_t type, UINT32 w, UINT32 h);
+void     layer_destroy(layer_t* layer);
+void     layer_set_z(layer_t* layer, int z);
+void     layer_set_pos(layer_t* layer, int x, int y);
+void     layer_set_visible(layer_t* layer, bool visible);
+layer_t* layer_get_by_id(UINT32 id);
+layer_t* layer_get_focused(void);
+
+// Compositor task entry
+void layer_compositor_task(void);