blender-archive/intern/ghost/GHOST_C-api.h

/**
 * $Id$
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */
/**
 * @file	GHOST_C-api.h
 * GHOST C-API function and type declarations.
 * The C-API wraps the C++ objects with the 
 */

#ifndef	GHOST_C_API_H
#define GHOST_C_API_H

#include "GHOST_Types.h"

#ifdef __cplusplus
extern "C" { 
#endif

/**
 * Creates a "handle" for a C++ GHOST object.
 * A handle is just an opaque pointer to an empty struct.
 * In the API the pointer is casted to the actual C++ class.
 * @param	name	Name of the handle to create.
 */
#define GHOST_DECLARE_HANDLE(name) typedef struct name##__ { int unused; } *name

GHOST_DECLARE_HANDLE(GHOST_SystemHandle);
GHOST_DECLARE_HANDLE(GHOST_TimerTaskHandle);
GHOST_DECLARE_HANDLE(GHOST_WindowHandle);
GHOST_DECLARE_HANDLE(GHOST_EventHandle);
GHOST_DECLARE_HANDLE(GHOST_RectangleHandle);
GHOST_DECLARE_HANDLE(GHOST_EventConsumerHandle);


/**
 * Definition of a callback routine that receives events.
 * @param event The event received.
 * @param userdata The callback's user data, supplied to GHOST_CreateSystem.
 */
typedef int (*GHOST_EventCallbackProcPtr)(GHOST_EventHandle event, GHOST_TUserDataPtr userdata);


/**
 * Creates the one and only system.
 * @return a handle to the system.
 */
extern GHOST_SystemHandle GHOST_CreateSystem(void);

/**
 * Disposes the one and only system.
 * @param systemhandle The handle to the system
 * @return An indication of success.
 */
extern GHOST_TSuccess GHOST_DisposeSystem(GHOST_SystemHandle systemhandle);


/**
 * Creates an event consumer object
 * @param eventCallback The event callback routine.
 * @param userdata		Pointer to user data returned to the callback routine.
 */
extern GHOST_EventConsumerHandle GHOST_CreateEventConsumer(GHOST_EventCallbackProcPtr eventCallback, GHOST_TUserDataPtr userdata);

/**
 * Disposes an event consumer object
 * @param consumerhandle	Handle to the event consumer.
 * @return An indication of success.
 */
extern GHOST_TSuccess GHOST_DisposeEventConsumer(GHOST_EventConsumerHandle consumerhandle);


/**
 * Returns the system time.
 * Returns the number of milliseconds since the start of the system process.
 * Based on ANSI clock() routine.
 * @param systemhandle The handle to the system
 * @return The number of milliseconds.
 */
extern GHOST_TUns64 GHOST_GetMilliSeconds(GHOST_SystemHandle systemhandle);

/**
 * Installs a timer.
 * Note that, on most operating systems, messages need to be processed in order 
 * for the timer callbacks to be invoked.
 * @param systemhandle The handle to the system
 * @param delay		The time to wait for the first call to the timerProc (in milliseconds)
 * @param interval	The interval between calls to the timerProc (in milliseconds)
 * @param timerProc	The callback invoked when the interval expires,
 * @param userData	Placeholder for user data.
 * @return A timer task (0 if timer task installation failed).
 */
extern GHOST_TimerTaskHandle GHOST_InstallTimer(GHOST_SystemHandle systemhandle,
												GHOST_TUns64 delay,
												GHOST_TUns64 interval,
												GHOST_TimerProcPtr timerProc,
												GHOST_TUserDataPtr userData);

/**
 * Removes a timer.
 * @param systemhandle The handle to the system
 * @param timerTask Timer task to be removed.
 * @return Indication of success.
 */
extern GHOST_TSuccess GHOST_RemoveTimer(GHOST_SystemHandle systemhandle,
										GHOST_TimerTaskHandle timertaskhandle);

/***************************************************************************************
 ** Display/window management functionality
 ***************************************************************************************/

/**
 * Returns the number of displays on this system.
 * @param systemhandle The handle to the system
 * @return The number of displays.
 */
extern GHOST_TUns8 GHOST_GetNumDisplays(GHOST_SystemHandle systemhandle);

/**
 * Returns the dimensions of the main display on this system.
 * @param systemhandle The handle to the system
 * @param width		A pointer the width gets put in
 * @param height	A pointer the height gets put in
 * @return void.
 */
extern void GHOST_GetMainDisplayDimensions(GHOST_SystemHandle systemhandle,
										   GHOST_TUns32* width,
										   GHOST_TUns32* height);

/**
 * Create a new window.
 * The new window is added to the list of windows managed. 
 * Never explicitly delete the window, use disposeWindow() instead.
 * @param systemhandle The handle to the system
 * @param	title	The name of the window (displayed in the title bar of the window if the OS supports it).
 * @param	left	The coordinate of the left edge of the window.
 * @param	top		The coordinate of the top edge of the window.
 * @param	width	The width the window.
 * @param	height	The height the window.
 * @param	state	The state of the window when opened.
 * @param	type	The type of drawing context installed in this window.
 * @return	A handle to the new window ( == NULL if creation failed).
 */
extern GHOST_WindowHandle GHOST_CreateWindow(GHOST_SystemHandle systemhandle,
	char* title,
	GHOST_TInt32 left,
	GHOST_TInt32 top,
	GHOST_TUns32 width,
	GHOST_TUns32 height,
	GHOST_TWindowState state,
	GHOST_TDrawingContextType type,
	const int stereoVisual);

/**
 * Returns the window user data.
 * @param windowhandle	The handle to the window
 * @return The window user data.
 */
extern GHOST_TUserDataPtr GHOST_GetWindowUserData(GHOST_WindowHandle windowhandle);
	
/**
 * Changes the window user data.
 * @param windowhandle	The handle to the window
 * @param data The window user data.
 */
extern void GHOST_SetWindowUserData(GHOST_WindowHandle windowhandle, 
	GHOST_TUserDataPtr userdata);

/**
 * Dispose a window.
 * @param systemhandle The handle to the system
 * @param	window Handle to the window to be disposed.
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_DisposeWindow(GHOST_SystemHandle systemhandle,
										  GHOST_WindowHandle windowhandle);

/**
 * Returns whether a window is valid.
 * @param systemhandle The handle to the system
 * @param	window Handle to the window to be checked.
 * @return	Indication of validity.
 */
extern int GHOST_ValidWindow(GHOST_SystemHandle systemhandle,
										GHOST_WindowHandle windowhandle);

/**
 * Begins full screen mode.
 * @param systemhandle The handle to the system
 * @param setting	The new setting of the display.
 * @return			A handle to the window displayed in full screen.
 *					This window is invalid after full screen has been ended.
 */
extern GHOST_WindowHandle GHOST_BeginFullScreen(GHOST_SystemHandle systemhandle,
	GHOST_DisplaySetting* setting,
	const int stereoVisual);

/**
 * Ends full screen mode.
 * @param systemhandle The handle to the system
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_EndFullScreen(GHOST_SystemHandle systemhandle);

/**
 * Returns current full screen mode status.
 * @param systemhandle The handle to the system
 * @return The current status.
 */
extern int GHOST_GetFullScreen(GHOST_SystemHandle systemhandle);

/***************************************************************************************
 ** Event management functionality
 ***************************************************************************************/

/**
 * Retrieves events from the system and stores them in the queue.
 * @param systemhandle The handle to the system
 * @param waitForEvent Boolean to indicate that ProcessEvents should
 * wait (block) until the next event before returning.
 * @return Indication of the presence of events.
 */
extern int GHOST_ProcessEvents(GHOST_SystemHandle systemhandle, int waitForEvent);

/**
 * Retrieves events from the queue and send them to the event consumers.
 * @param systemhandle The handle to the system
 * @return Indication of the presence of events.
 */
extern int GHOST_DispatchEvents(GHOST_SystemHandle systemhandle);

/**
 * Adds the given event consumer to our list.
 * @param systemhandle The handle to the system
 * @param consumerhandle The event consumer to add.
 * @return Indication of success.
 */
extern GHOST_TSuccess GHOST_AddEventConsumer(GHOST_SystemHandle systemhandle,
											  GHOST_EventConsumerHandle consumerhandle);
	


/***************************************************************************************
 ** Cursor management functionality
 ***************************************************************************************/

/**
 * Returns the current cursor shape.
 * @param windowhandle The handle to the window
 * @return	The current cursor shape.
 */
extern GHOST_TStandardCursor GHOST_GetCursorShape(GHOST_WindowHandle windowhandle);

/**
 * Set the shape of the cursor.
 * @param windowhandle The handle to the window
 * @param	cursor	The new cursor shape type id.
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_SetCursorShape(GHOST_WindowHandle windowhandle,
										   GHOST_TStandardCursor cursorshape);

/**
 * Set the shape of the cursor to a custom cursor.
 * @param windowhandle The handle to the window
 * @param	bitmap	The bitmap data for the cursor.
 * @param	mask	The mask data for the cursor.
 * @param	hotX	The X coordinate of the cursor hotspot.
 * @param	hotY	The Y coordinate of the cursor hotspot.
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_SetCustomCursorShape(GHOST_WindowHandle windowhandle,
												 GHOST_TUns8 bitmap[16][2], 
												 GHOST_TUns8 mask[16][2], 
												 int hotX, 
												 int hotY);

/**
 * Returns the visibility state of the cursor.
 * @param windowhandle The handle to the window
 * @return	The visibility state of the cursor.
 */
extern int GHOST_GetCursorVisibility(GHOST_WindowHandle windowhandle);

/**
 * Shows or hides the cursor.
 * @param windowhandle The handle to the window
 * @param	visible The new visibility state of the cursor.
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_SetCursorVisibility(GHOST_WindowHandle windowhandle,
												int visible);

/**
 * Returns the current location of the cursor (location in screen coordinates)
 * @param systemhandle The handle to the system
 * @param x			The x-coordinate of the cursor.
 * @param y			The y-coordinate of the cursor.
 * @return			Indication of success.
 */
extern GHOST_TSuccess GHOST_GetCursorPosition(GHOST_SystemHandle systemhandle,
											  GHOST_TInt32* x,
											  GHOST_TInt32* y);

/**
 * Updates the location of the cursor (location in screen coordinates).
 * Not all operating systems allow the cursor to be moved (without the input device being moved).
 * @param systemhandle The handle to the system
 * @param x			The x-coordinate of the cursor.
 * @param y			The y-coordinate of the cursor.
 * @return			Indication of success.
 */
extern GHOST_TSuccess GHOST_SetCursorPosition(GHOST_SystemHandle systemhandle,
											  GHOST_TInt32 x,
											  GHOST_TInt32 y);

/***************************************************************************************
 ** Access to mouse button and keyboard states.
 ***************************************************************************************/

/**
 * Returns the state of a modifier key (ouside the message queue).
 * @param systemhandle The handle to the system
 * @param mask		The modifier key state to retrieve.
 * @param isDown	Pointer to return modifier state in.
 * @return			Indication of success.
 */
extern GHOST_TSuccess GHOST_GetModifierKeyState(GHOST_SystemHandle systemhandle,
												GHOST_TModifierKeyMask mask,
												int* isDown);

/**
 * Returns the state of a mouse button (ouside the message queue).
 * @param systemhandle The handle to the system
 * @param mask		The button state to retrieve.
 * @param isDown	Pointer to return button state in.
 * @return			Indication of success.
 */
extern GHOST_TSuccess GHOST_GetButtonState(GHOST_SystemHandle systemhandle,
										   GHOST_TButtonMask mask,
										   int* isDown);

/**
 * Returns the event type.
 * @param eventhandle The handle to the event
 * @return The event type.
 */
extern GHOST_TEventType GHOST_GetEventType(GHOST_EventHandle eventhandle);

/**
 * Returns the time this event was generated.
 * @param eventhandle The handle to the event
 * @return The event generation time.
 */
extern GHOST_TUns64 GHOST_GetEventTime(GHOST_EventHandle eventhandle);

/**
 * Returns the window this event was generated on, 
 * or NULL if it is a 'system' event.
 * @param eventhandle The handle to the event
 * @return The generating window.
 */
extern GHOST_WindowHandle GHOST_GetEventWindow(GHOST_EventHandle eventhandle);

/**
 * Returns the event data.
 * @param eventhandle The handle to the event
 * @return The event data.
 */
extern GHOST_TEventDataPtr GHOST_GetEventData(GHOST_EventHandle eventhandle);

/**
 * Returns the timer callback.
 * @param timertaskhandle	The handle to the timertask
 * @return The timer callback.
 */
extern GHOST_TimerProcPtr GHOST_GetTimerProc(GHOST_TimerTaskHandle timertaskhandle);

/**
 * Changes the timer callback.
 * @param timertaskhandle The handle to the timertask
 * @param timerProc The timer callback.
 */
extern void GHOST_SetTimerProc(GHOST_TimerTaskHandle timertaskhandle,
							   GHOST_TimerProcPtr timerProc);

/**
 * Returns the timer user data.
 * @param timertaskhandle	The handle to the timertask
 * @return The timer user data.
 */
extern GHOST_TUserDataPtr GHOST_GetTimerTaskUserData(GHOST_TimerTaskHandle timertaskhandle);
	
/**
 * Changes the time user data.
 * @param timertaskhandle	The handle to the timertask
 * @param data The timer user data.
 */
extern void GHOST_SetTimerTaskUserData(GHOST_TimerTaskHandle timertaskhandle,
									   GHOST_TUserDataPtr userData);

/**
 * Returns indication as to whether the window is valid.
 * @param windowhandle The handle to the window
 * @return The validity of the window.
 */
extern int GHOST_GetValid(GHOST_WindowHandle windowhandle) ;

/**
 * Returns the type of drawing context used in this window.
 * @param windowhandle The handle to the window
 * @return The current type of drawing context.
 */
extern GHOST_TDrawingContextType GHOST_GetDrawingContextType(GHOST_WindowHandle windowhandle);

/**
 * Tries to install a rendering context in this window.
 * @param windowhandle The handle to the window
 * @param type	The type of rendering context installed.
 * @return Indication as to whether installation has succeeded.
 */
extern GHOST_TSuccess GHOST_SetDrawingContextType(GHOST_WindowHandle windowhandle,
												  GHOST_TDrawingContextType type);

/**
 * Sets the title displayed in the title bar.
 * @param windowhandle The handle to the window
 * @param title	The title to display in the title bar.
 */
extern void GHOST_SetTitle(GHOST_WindowHandle windowhandle,
						   char* title);

/**
 * Returns the title displayed in the title bar. The title
 * should be free'd with free().
 * 
 * @param windowhandle The handle to the window
 * @return The title, free with free().
 */
extern char* GHOST_GetTitle(GHOST_WindowHandle windowhandle);

/**
 * Returns the window rectangle dimensions.
 * These are screen coordinates.
 * @param windowhandle The handle to the window
 * @return A handle to the bounding rectangle of the window.
 */
extern GHOST_RectangleHandle GHOST_GetWindowBounds(GHOST_WindowHandle windowhandle);

/**
 * Returns the client rectangle dimensions.
 * The left and top members of the rectangle are always zero.
 * @param windowhandle The handle to the window
 * @return A handle to the bounding rectangle of the window.
 */
extern GHOST_RectangleHandle GHOST_GetClientBounds(GHOST_WindowHandle windowhandle);

/**
 * Disposes a rectangle object
 * @param rectanglehandle	Handle to the rectangle.
 */
void GHOST_DisposeRectangle(GHOST_RectangleHandle rectanglehandle);

/**
 * Resizes client rectangle width.
 * @param windowhandle The handle to the window
 * @param width The new width of the client area of the window.
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_SetClientWidth(GHOST_WindowHandle windowhandle,
										   GHOST_TUns32 width);

/**
 * Resizes client rectangle height.
 * @param windowhandle The handle to the window
 * @param height The new height of the client area of the window.
 * @return	Indication of success.
 */
extern GHOST_TSuccess GHOST_SetClientHeight(GHOST_WindowHandle windowhandle,
											GHOST_TUns32 height);

/**
 * Resizes client rectangle.
 * @param windowhandle The handle to the window
 * @param width		The new width of the client area of the window.
 * @param height	The new height of the client area of the window.
 * @return			Indication of success.
 */
extern GHOST_TSuccess GHOST_SetClientSize(GHOST_WindowHandle windowhandle,
										  GHOST_TUns32 width,
										  GHOST_TUns32 height);

/**
 * Converts a point in screen coordinates to client rectangle coordinates
 * @param windowhandle The handle to the window
 * @param inX	The x-coordinate on the screen.
 * @param inY	The y-coordinate on the screen.
 * @param outX	The x-coordinate in the client rectangle.
 * @param outY	The y-coordinate in the client rectangle.
 */
extern void GHOST_ScreenToClient(GHOST_WindowHandle windowhandle,
								 GHOST_TInt32 inX,
								 GHOST_TInt32 inY,
								 GHOST_TInt32* outX,
								 GHOST_TInt32* outY) ;

/**
 * Converts a point in screen coordinates to client rectangle coordinates
 * @param windowhandle The handle to the window
 * @param inX	The x-coordinate in the client rectangle.
 * @param inY	The y-coordinate in the client rectangle.
 * @param outX	The x-coordinate on the screen.
 * @param outY	The y-coordinate on the screen.
 */
extern void GHOST_ClientToScreen(GHOST_WindowHandle windowhandle,
								 GHOST_TInt32 inX,
								 GHOST_TInt32 inY,
								 GHOST_TInt32* outX,
								 GHOST_TInt32* outY);

/**
 * Returns the state of the window (normal, minimized, maximized).
 * @param windowhandle The handle to the window
 * @return The state of the window.
 */
extern GHOST_TWindowState GHOST_GetWindowState(GHOST_WindowHandle windowhandle);

/**
 * Sets the state of the window (normal, minimized, maximized).
 * @param windowhandle The handle to the window
 * @param state The state of the window.
 * @return Indication of success.
 */
extern GHOST_TSuccess GHOST_SetWindowState(GHOST_WindowHandle windowhandle,
										   GHOST_TWindowState state);

/**
 * Sets the order of the window (bottom, top).
 * @param windowhandle The handle to the window
 * @param order The order of the window.
 * @return Indication of success.
 */
extern GHOST_TSuccess GHOST_SetWindowOrder(GHOST_WindowHandle windowhandle,
										   GHOST_TWindowOrder order);

/**
 * Swaps front and back buffers of a window.
 * @param windowhandle The handle to the window
 * @return	An intean success indicator.
 */
extern GHOST_TSuccess GHOST_SwapWindowBuffers(GHOST_WindowHandle windowhandle);

/**
 * Activates the drawing context of this window.
 * @param windowhandle The handle to the window
 * @return	An intean success indicator.
 */
extern GHOST_TSuccess GHOST_ActivateWindowDrawingContext(GHOST_WindowHandle windowhandle);

/**
 * Invalidates the contents of this window.
 * @param windowhandle The handle to the window
 * @return Indication of success.
 */
extern GHOST_TSuccess GHOST_InvalidateWindow(GHOST_WindowHandle windowhandle);

/**
 * Access to rectangle width.
 * @param rectanglehandle The handle to the rectangle
 * @return	width of the rectangle
 */
extern GHOST_TInt32 GHOST_GetWidthRectangle(GHOST_RectangleHandle rectanglehandle);

/**
 * Access to rectangle height.
 * @param rectanglehandle The handle to the rectangle
 * @return	height of the rectangle
 */
extern GHOST_TInt32 GHOST_GetHeightRectangle(GHOST_RectangleHandle rectanglehandle);

/**
 * Gets all members of the rectangle.
 * @param rectanglehandle The handle to the rectangle
 * @param	l	Pointer to return left coordinate in.
 * @param	t	Pointer to return top coordinate in.
 * @param	r	Pointer to return right coordinate in.
 * @param	b	Pointer to return bottom coordinate in.
 */
extern void GHOST_GetRectangle(GHOST_RectangleHandle rectanglehandle,
							   GHOST_TInt32* l,
							   GHOST_TInt32* t,
							   GHOST_TInt32* r,
							   GHOST_TInt32* b);

/**
 * Sets all members of the rectangle.
 * @param rectanglehandle The handle to the rectangle
 * @param	l	requested left coordinate of the rectangle
 * @param	t	requested top coordinate of the rectangle
 * @param	r	requested right coordinate of the rectangle
 * @param	b	requested bottom coordinate of the rectangle
 */
extern void GHOST_SetRectangle(GHOST_RectangleHandle rectanglehandle,
							   GHOST_TInt32 l,
							   GHOST_TInt32 t,
							   GHOST_TInt32 r,
							   GHOST_TInt32 b);

/**
 * Returns whether this rectangle is empty.
 * Empty rectangles are rectangles that have width==0 and/or height==0.
 * @param rectanglehandle The handle to the rectangle
 * @return	intean value (true == empty rectangle)
 */
extern GHOST_TSuccess GHOST_IsEmptyRectangle(GHOST_RectangleHandle rectanglehandle);

/**
 * Returns whether this rectangle is valid.
 * Valid rectangles are rectangles that have m_l <= m_r and m_t <= m_b. Thus, emapty rectangles are valid.
 * @param rectanglehandle The handle to the rectangle
 * @return	intean value (true==valid rectangle)
 */
extern GHOST_TSuccess GHOST_IsValidRectangle(GHOST_RectangleHandle rectanglehandle);

/**
 * Grows (or shrinks the rectangle).
 * The method avoids negative insets making the rectangle invalid
 * @param rectanglehandle The handle to the rectangle
 * @param	i	The amount of offset given to each extreme (negative values shrink the rectangle).
 */
extern void GHOST_InsetRectangle(GHOST_RectangleHandle rectanglehandle,
								 GHOST_TInt32 i);

/**
 * Does a union of the rectangle given and this rectangle.
 * The result is stored in this rectangle.
 * @param rectanglehandle The handle to the rectangle
 * @param	r	The rectangle that is input for the union operation.
 */
extern void GHOST_UnionRectangle(GHOST_RectangleHandle rectanglehandle,
								 GHOST_RectangleHandle anotherrectanglehandle);

/**
 * Grows the rectangle to included a point.
 * @param rectanglehandle The handle to the rectangle
 * @param	x	The x-coordinate of the point.
 * @param	y	The y-coordinate of the point.
 */
extern void GHOST_UnionPointRectangle(GHOST_RectangleHandle rectanglehandle,
									  GHOST_TInt32 x,
									  GHOST_TInt32 y);

/**
 * Returns whether the point is inside this rectangle.
 * Point on the boundary is considered inside.
 * @param rectanglehandle The handle to the rectangle
 * @param x	x-coordinate of point to test.
 * @param y y-coordinate of point to test.
 * @return intean value (true if point is inside).
 */
extern GHOST_TSuccess GHOST_IsInsideRectangle(GHOST_RectangleHandle rectanglehandle,
											  GHOST_TInt32 x,
											  GHOST_TInt32 y);

/**
 * Returns whether the rectangle is inside this rectangle.
 * @param rectanglehandle The handle to the rectangle
 * @param	r	rectangle to test.
 * @return	visibility (not, partially or fully visible).
 */
extern GHOST_TVisibility GHOST_GetRectangleVisibility(GHOST_RectangleHandle rectanglehandle,
													  GHOST_RectangleHandle anotherrectanglehandle);

/**
 * Sets rectangle members.
 * Sets rectangle members such that it is centered at the given location.
 * @param rectanglehandle The handle to the rectangle
 * @param	cx	requested center x-coordinate of the rectangle
 * @param	cy	requested center y-coordinate of the rectangle
 */
extern void GHOST_SetCenterRectangle(GHOST_RectangleHandle rectanglehandle,
									 GHOST_TInt32 cx,
									 GHOST_TInt32 cy);

/**
 * Sets rectangle members.
 * Sets rectangle members such that it is centered at the given location,
 * with the width requested.
 * @param rectanglehandle The handle to the rectangle
 * @param	cx	requested center x-coordinate of the rectangle
 * @param	cy	requested center y-coordinate of the rectangle
 * @param	w	requested width of the rectangle
 * @param	h	requested height of the rectangle
 */
extern void GHOST_SetRectangleCenter(GHOST_RectangleHandle rectanglehandle,
									 GHOST_TInt32 cx,
									 GHOST_TInt32 cy,
									 GHOST_TInt32 w,
									 GHOST_TInt32 h);

/**
 * Clips a rectangle.
 * Updates the rectangle given such that it will fit within this one.
 * This can result in an empty rectangle.
 * @param rectanglehandle The handle to the rectangle
 * @param	r	the rectangle to clip
 * @return	whether clipping has occurred
 */
extern GHOST_TSuccess GHOST_ClipRectangle(GHOST_RectangleHandle rectanglehandle,
										  GHOST_RectangleHandle anotherrectanglehandle);

#ifdef __cplusplus
}
#endif

#endif