diff --git a/src/graphics.h b/src/graphics.h
index 7f97a95..c13805f 100644
--- a/src/graphics.h
+++ b/src/graphics.h
@@ -180,7 +180,7 @@ MP_API bool mg_canvas_is_nil(mg_canvas canvas);
 
 MP_API mg_canvas mg_canvas_create(void);
 MP_API void mg_canvas_destroy(mg_canvas canvas);
-mg_canvas mg_canvas_set_current(mg_canvas canvas);
+MP_API mg_canvas mg_canvas_set_current(mg_canvas canvas);
 MP_API void mg_render(mg_surface surface, mg_canvas canvas);
 
 //------------------------------------------------------------------------------------------
diff --git a/src/graphics_common.h b/src/graphics_common.h
index d884392..9596694 100644
--- a/src/graphics_common.h
+++ b/src/graphics_common.h
@@ -1,82 +1,82 @@
-/************************************************************//**
-*
-*	@file: graphics_common.h
-*	@author: Martin Fouilleul
-*	@date: 26/04/2023
-*
-*****************************************************************/
-#ifndef __GRAPHICS_COMMON_H_
-#define __GRAPHICS_COMMON_H_
-
-#include"graphics.h"
-
-//------------------------------------------------------------------------
-// canvas structs
-//------------------------------------------------------------------------
-typedef enum { MG_PATH_MOVE,
-               MG_PATH_LINE,
-	           MG_PATH_QUADRATIC,
-	           MG_PATH_CUBIC } mg_path_elt_type;
-
-typedef struct mg_path_elt
-{
-	mg_path_elt_type type;
-	vec2 p[3];
-
-} mg_path_elt;
-
-typedef struct mg_path_descriptor
-{
-	u32 startIndex;
-	u32 count;
-	vec2 startPoint;
-
-} mg_path_descriptor;
-
-typedef struct mg_attributes
-{
-	f32 width;
-	f32 tolerance;
-	mg_color color;
-	mg_joint_type joint;
-	f32 maxJointExcursion;
-	mg_cap_type cap;
-
-	mg_font font;
-	f32 fontSize;
-
-	mg_image image;
-	mp_rect srcRegion;
-
-	mg_mat2x3 transform;
-	mp_rect clip;
-
-} mg_attributes;
-
-typedef enum { MG_CMD_FILL,
-	           MG_CMD_STROKE,
-	           MG_CMD_JUMP
-	     } mg_primitive_cmd;
-
-typedef struct mg_primitive
-{
-	mg_primitive_cmd cmd;
-	mg_attributes attributes;
-
-	union
-	{
-		mg_path_descriptor path;
-		mp_rect rect;
-		u32 jump;
-	};
-
-} mg_primitive;
-
-void mg_surface_render_commands(mg_surface surface,
-                                mg_color clearColor,
-                                u32 primitiveCount,
-                                mg_primitive* primitives,
-                                u32 eltCount,
-                                mg_path_elt* elements);
-
-#endif //__GRAPHICS_COMMON_H_
+/************************************************************//**
+*
+*	@file: graphics_common.h
+*	@author: Martin Fouilleul
+*	@date: 26/04/2023
+*
+*****************************************************************/
+#ifndef __GRAPHICS_COMMON_H_
+#define __GRAPHICS_COMMON_H_
+
+#include"graphics.h"
+
+//------------------------------------------------------------------------
+// canvas structs
+//------------------------------------------------------------------------
+typedef enum { MG_PATH_MOVE,
+               MG_PATH_LINE,
+	           MG_PATH_QUADRATIC,
+	           MG_PATH_CUBIC } mg_path_elt_type;
+
+typedef struct mg_path_elt
+{
+	mg_path_elt_type type;
+	vec2 p[3];
+
+} mg_path_elt;
+
+typedef struct mg_path_descriptor
+{
+	u32 startIndex;
+	u32 count;
+	vec2 startPoint;
+
+} mg_path_descriptor;
+
+typedef struct mg_attributes
+{
+	f32 width;
+	f32 tolerance;
+	mg_color color;
+	mg_joint_type joint;
+	f32 maxJointExcursion;
+	mg_cap_type cap;
+
+	mg_font font;
+	f32 fontSize;
+
+	mg_image image;
+	mp_rect srcRegion;
+
+	mg_mat2x3 transform;
+	mp_rect clip;
+
+} mg_attributes;
+
+typedef enum { MG_CMD_FILL,
+	           MG_CMD_STROKE,
+	           MG_CMD_JUMP
+	     } mg_primitive_cmd;
+
+typedef struct mg_primitive
+{
+	mg_primitive_cmd cmd;
+	mg_attributes attributes;
+
+	union
+	{
+		mg_path_descriptor path;
+		mp_rect rect;
+		u32 jump;
+	};
+
+} mg_primitive;
+
+MP_API void mg_surface_render_commands(mg_surface surface,
+                                       mg_color clearColor,
+                                       u32 primitiveCount,
+                                       mg_primitive* primitives,
+                                       u32 eltCount,
+                                       mg_path_elt* elements);
+
+#endif //__GRAPHICS_COMMON_H_
diff --git a/src/platform/platform_io_internal.h b/src/platform/platform_io_internal.h
index f115056..318ef27 100644
--- a/src/platform/platform_io_internal.h
+++ b/src/platform/platform_io_internal.h
@@ -51,7 +51,7 @@ void file_slot_recycle(file_table* table, file_slot* slot);
 file_handle file_handle_from_slot(file_table* table, file_slot* slot);
 file_slot* file_slot_from_handle(file_table* table, file_handle handle);
 
-io_cmp io_wait_single_req_with_table(io_req* req, file_table* table);
+MP_API io_cmp io_wait_single_req_with_table(io_req* req, file_table* table);
 
 
 //-----------------------------------------------------------------------
diff --git a/src/win32_app.c b/src/win32_app.c
index c0cac7c..258e1e4 100644
--- a/src/win32_app.c
+++ b/src/win32_app.c
@@ -771,6 +771,32 @@ mp_rect mp_window_get_content_rect(mp_window window)
 	return(rect);
 }
 
+//TODO: set content rect, center
+void mp_window_center(mp_window window)
+{
+	mp_window_data* windowData = mp_window_ptr_from_handle(window);
+	if(windowData)
+	{
+		RECT winRect;
+		GetWindowRect(windowData->win32.hWnd, &winRect);
+
+		HMONITOR monitor = MonitorFromPoint((POINT){winRect.left, winRect.top}, MONITOR_DEFAULTTOPRIMARY);
+		MONITORINFO monitorInfo = {.cbSize = sizeof(MONITORINFO)};
+		GetMonitorInfoW(monitor, &monitorInfo);
+
+		int monW = monitorInfo.rcWork.right - monitorInfo.rcWork.left;
+		int monH = monitorInfo.rcWork.bottom - monitorInfo.rcWork.top;
+		int winW = winRect.right - winRect.left;
+		int winH = winRect.bottom - winRect.top;
+
+		int winX = 0.5*(monW-winW);
+		int winY = 0.5*(monW-winW);
+
+		SetWindowPos(windowData->win32.hWnd, NULL, winX, winY, winW, winH, SWP_NOZORDER|SWP_NOACTIVATE);
+	}
+}
+
+
 //--------------------------------------------------------------------------------
 // clipboard functions
 //--------------------------------------------------------------------------------