tcl.git - Tcl is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful.

Tcl is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful.

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generic/tcl.h

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/*
 * tkWinWm.c --
 *
 *	This module takes care of the interactions between a Tk-based
 *	application and the window manager. Among other things, it implements
 *	the "wm" command and passes geometry information to the window
 *	manager.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 by Scriptics Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkWinInt.h"
#include <shellapi.h>

/*
 * These next two defines are only valid on Win2K/XP+.
 */

#ifndef WS_EX_LAYERED
#define WS_EX_LAYERED	0x00080000
#endif
#ifndef LWA_COLORKEY
#define LWA_COLORKEY	0x00000001
#endif
#ifndef LWA_ALPHA
#define LWA_ALPHA	0x00000002
#endif

/*
 * Event structure for synthetic activation events. These events are placed on
 * the event queue whenever a toplevel gets a WM_MOUSEACTIVATE message or
 * a WM_ACTIVATE. If the window is being moved (*flagPtr will be true)
 * then the handling of this event must be delayed until the operation
 * has completed to avoid a premature WM_EXITSIZEMOVE event.
 */

typedef struct ActivateEvent {
    Tcl_Event ev;
    TkWindow *winPtr;
    const int *flagPtr;
    HWND hwnd;
} ActivateEvent;

/*
 * A data structure of the following type holds information for each window
 * manager protocol (such as WM_DELETE_WINDOW) for which a handler (i.e. a Tcl
 * command) has been defined for a particular top-level window.
 */

typedef struct ProtocolHandler {
    Atom protocol;		/* Identifies the protocol. */
    struct ProtocolHandler *nextPtr;
				/* Next in list of protocol handlers for the
				 * same top-level window, or NULL for end of
				 * list. */
    Tcl_Interp *interp;		/* Interpreter in which to invoke command. */
    char command[1];		/* Tcl command to invoke when a client message
				 * for this protocol arrives. The actual size
				 * of the structure varies to accommodate the
				 * needs of the actual command. THIS MUST BE
				 * THE LAST FIELD OF THE STRUCTURE. */
} ProtocolHandler;

#define HANDLER_SIZE(cmdLength) \
    ((unsigned) ((Tk_Offset(ProtocolHandler, command) + 1) + cmdLength))

/*
 * Helper type passed via lParam to TkWmStackorderToplevelEnumProc
 */

typedef struct TkWmStackorderToplevelPair {
    Tcl_HashTable *table;
    TkWindow **windowPtr;
} TkWmStackorderToplevelPair;

/*
 * This structure represents the contents of a icon, in terms of its image.
 * The HICON is an internal Windows format. Most of these icon-specific
 * structures originated with the Winico extension. We stripped out unused
 * parts of that code, and integrated the code more naturally with Tcl.
 */

typedef struct {
    UINT Width, Height, Colors;	/* Width, Height and bpp */
    LPBYTE lpBits;		/* Ptr to DIB bits */
    DWORD dwNumBytes;		/* How many bytes? */
    LPBITMAPINFO lpbi;		/* Ptr to header */
    LPBYTE lpXOR;		/* Ptr to XOR image bits */
    LPBYTE lpAND;		/* Ptr to AND image bits */
    HICON hIcon;		/* DAS ICON */
} ICONIMAGE, *LPICONIMAGE;

/*
 * This structure is how we represent a block of the above items. We will
 * reallocate these structures according to how many images they need to
 * contain.
 */

typedef struct {
    int nNumImages;		/* How many images? */
    ICONIMAGE IconImages[1];	/* Image entries */
} BlockOfIconImages, *BlockOfIconImagesPtr;

/*
 * These two structures are used to read in icons from an 'icon directory'
 * (i.e. the contents of a .icr file, say). We only use these structures
 * temporarily, since we copy the information we want into a
 * BlockOfIconImages.
 */

typedef struct {
    BYTE bWidth;		/* Width of the image */
    BYTE bHeight;		/* Height of the image (times 2) */
    BYTE bColorCount;		/* Number of colors in image (0 if >=8bpp) */
    BYTE bReserved;		/* Reserved */
    WORD wPlanes;		/* Color Planes */
    WORD wBitCount;		/* Bits per pixel */
    DWORD dwBytesInRes;		/* How many bytes in this resource? */
    DWORD dwImageOffset;	/* Where in the file is this image */
} ICONDIRENTRY, *LPICONDIRENTRY;

typedef struct {
    WORD idReserved;		/* Reserved */
    WORD idType;		/* Resource type (1 for icons) */
    WORD idCount;		/* How many images? */
    ICONDIRENTRY idEntries[1];	/* The entries for each image */
} ICONDIR, *LPICONDIR;

/*
 * A pointer to one of these strucutures is associated with each toplevel.
 * This allows us to free up all memory associated with icon resources when a
 * window is deleted or if the window's icon is changed. They are simply
 * reference counted according to:
 *
 * (1) How many WmInfo structures point to this object
 * (2) Whether the ThreadSpecificData defined in this file contains a pointer
 *     to this object.
 *
 * The former count is for windows whose icons are individually set, and the
 * latter is for the global default icon choice.
 *
 * Icons loaded from .icr/.icr use the iconBlock field, icons loaded from
 * .exe/.dll use the hIcon field.
 */

typedef struct WinIconInstance {
    int refCount;		/* Number of instances that share this data
				 * structure. */
    BlockOfIconImagesPtr iconBlock;
				/* Pointer to icon resource data for image */
} WinIconInstance;

typedef struct WinIconInstance *WinIconPtr;

/*
 * A data structure of the following type holds window-manager-related
 * information for each top-level window in an application.
 */

typedef struct TkWmInfo {
    TkWindow *winPtr;		/* Pointer to main Tk information for this
				 * window. */
    HWND wrapper;		/* This is the decorative frame window created
				 * by the window manager to wrap a toplevel
				 * window. This window is a direct child of
				 * the root window. */
    char *title;		/* Title to display in window caption. If
				 * NULL, use name of widget. Malloced. */
    char *iconName;		/* Name to display in icon. Malloced. */
    XWMHints hints;		/* Various pieces of information for window
				 * manager. */
    char *leaderName;		/* Path name of leader of window group
				 * (corresponds to hints.window_group).
				 * Malloc-ed. Note: this field doesn't get
				 * updated if leader is destroyed. */
    TkWindow *masterPtr;	/* Master window for TRANSIENT_FOR property,
				 * or NULL. */
    Tk_Window icon;		/* Window to use as icon for this window, or
				 * NULL. */
    Tk_Window iconFor;		/* Window for which this window is icon, or
				 * NULL if this isn't an icon for anyone. */

    /*
     * Information used to construct an XSizeHints structure for the window
     * manager:
     */

    int defMinWidth, defMinHeight, defMaxWidth, defMaxHeight;
				/* Default resize limits given by system. */
    int sizeHintsFlags;		/* Flags word for XSizeHints structure. If the
				 * PBaseSize flag is set then the window is
				 * gridded; otherwise it isn't gridded. */
    int minWidth, minHeight;	/* Minimum dimensions of window, in pixels or
				 * grid units. */
    int maxWidth, maxHeight;	/* Maximum dimensions of window, in pixels or
				 * grid units. 0 to default. */
    Tk_Window gridWin;		/* Identifies the window that controls
				 * gridding for this top-level, or NULL if the
				 * top-level isn't currently gridded. */
    int widthInc, heightInc;	/* Increments for size changes (# pixels per
				 * step). */
    struct {
	int x;	/* numerator */
	int y;	/* denominator */
    } minAspect, maxAspect;	/* Min/max aspect ratios for window. */
    int reqGridWidth, reqGridHeight;
				/* The dimensions of the window (in grid
				 * units) requested through the geometry
				 * manager. */
    int gravity;		/* Desired window gravity. */

    /*
     * Information used to manage the size and location of a window.
     */

    int width, height;		/* Desired dimensions of window, specified in
				 * pixels or grid units. These values are set
				 * by the "wm geometry" command and by
				 * ConfigureNotify events (for when wm resizes
				 * window). -1 means user hasn't requested
				 * dimensions. */
    int x, y;			/* Desired X and Y coordinates for window.
				 * These values are set by "wm geometry", plus
				 * by ConfigureNotify events (when wm moves
				 * window). These numbers are different than
				 * the numbers stored in winPtr->changes
				 * because (a) they could be measured from the
				 * right or bottom edge of the screen (see
				 * WM_NEGATIVE_X and WM_NEGATIVE_Y flags) and
				 * (b) if the window has been reparented then
				 * they refer to the parent rather than the
				 * window itself. */
    int borderWidth, borderHeight;
				/* Width and height of window dressing, in
				 * pixels for the current style/exStyle. This
				 * includes the border on both sides of the
				 * window. */
    int configX, configY;	/* x,y position of toplevel when window is
				 * switched into fullscreen state, */
    int configWidth, configHeight;
				/* Dimensions passed to last request that we
				 * issued to change geometry of window. Used
				 * to eliminate redundant resize operations */
    HMENU hMenu;		/* the hMenu associated with this menu */
    DWORD style, exStyle;	/* Style flags for the wrapper window. */
    LONG styleConfig;		/* Extra user requested style bits */
    LONG exStyleConfig;		/* Extra user requested extended style bits */
    Tcl_Obj *crefObj;		/* COLORREF object for transparent handling */
    COLORREF colorref;		/* COLORREF for transparent handling */
    double alpha;		/* Alpha transparency level 0.0 (fully
				 * transparent) .. 1.0 (opaque) */

    /*
     * List of children of the toplevel which have private colormaps.
     */

    TkWindow **cmapList;	/* Array of window with private colormaps. */
    int cmapCount;		/* Number of windows in array. */

    /*
     * Miscellaneous information.
     */

    ProtocolHandler *protPtr;	/* First in list of protocol handlers for this
				 * window (NULL means none). */
    int cmdArgc;		/* Number of elements in cmdArgv below. */
    const char **cmdArgv;	/* Array of strings to store in the WM_COMMAND
				 * property. NULL means nothing available. */
    char *clientMachine;	/* String to store in WM_CLIENT_MACHINE
				 * property, or NULL. */
    int flags;			/* Miscellaneous flags, defined below. */
    int numTransients;		/* Number of transients on this window */
    WinIconPtr iconPtr;		/* Pointer to titlebar icon structure for this
				 * window, or NULL. */
    struct TkWmInfo *nextPtr;	/* Next in list of all top-level windows. */
} WmInfo;

/*
 * Flag values for WmInfo structures:
 *
 * WM_NEVER_MAPPED -		Non-zero means window has never been mapped;
 *				need to update all info when window is first
 *				mapped.
 * WM_UPDATE_PENDING -		Non-zero means a call to UpdateGeometryInfo
 *				has already been scheduled for this window;
 *				no need to schedule another one.
 * WM_NEGATIVE_X -		Non-zero means x-coordinate is measured in
 *				pixels from right edge of screen, rather than
 *				from left edge.
 * WM_NEGATIVE_Y -		Non-zero means y-coordinate is measured in
 *				pixels up from bottom of screen, rather than
 *				down from top.
 * WM_UPDATE_SIZE_HINTS -	Non-zero means that new size hints need to be
 *				propagated to window manager. Not used on Win.
 * WM_SYNC_PENDING -		Set to non-zero while waiting for the window
 *				manager to respond to some state change.
 * WM_MOVE_PENDING -		Non-zero means the application has requested a
 *				new position for the window, but it hasn't
 *				been reflected through the window manager yet.
 * WM_COLORMAPS_EXPLICIT -	Non-zero means the colormap windows were set
 *				explicitly via "wm colormapwindows".
 * WM_ADDED_TOPLEVEL_COLORMAP - Non-zero means that when "wm colormapwindows"
 *				was called the top-level itself wasn't
 *				specified, so we added it implicitly at the
 *				end of the list.
 * WM_WIDTH_NOT_RESIZABLE -	Non-zero means that we're not supposed to
 *				allow the user to change the width of the
 *				window (controlled by "wm resizable" command).
 * WM_HEIGHT_NOT_RESIZABLE -	Non-zero means that we're not supposed to
 *				allow the user to change the height of the
 *				window (controlled by "wm resizable" command).
 * WM_WITHDRAWN -		Non-zero means that this window has explicitly
 *				been withdrawn. If it's a transient, it should
 *				not mirror state changes in the master.
 * WM_FULLSCREEN -		Non-zero means that this window has been placed
 *				in the full screen mode. It should be mapped at
 *				0,0 and be the width and height of the screen.
 */

#define WM_NEVER_MAPPED			(1<<0)
#define WM_UPDATE_PENDING		(1<<1)
#define WM_NEGATIVE_X			(1<<2)
#define WM_NEGATIVE_Y			(1<<3)
#define WM_UPDATE_SIZE_HINTS		(1<<4)
#define WM_SYNC_PENDING			(1<<5)
#define WM_CREATE_PENDING		(1<<6)
#define WM_MOVE_PENDING			(1<<7)
#define WM_COLORMAPS_EXPLICIT		(1<<8)
#define WM_ADDED_TOPLEVEL_COLORMAP	(1<<9)
#define WM_WIDTH_NOT_RESIZABLE		(1<<10)
#define WM_HEIGHT_NOT_RESIZABLE		(1<<11)
#define WM_WITHDRAWN			(1<<12)
#define WM_FULLSCREEN			(1<<13)

/*
 * Window styles for various types of toplevel windows.
 */

#define WM_OVERRIDE_STYLE (WS_CLIPCHILDREN|WS_CLIPSIBLINGS|CS_DBLCLKS)
#define EX_OVERRIDE_STYLE (WS_EX_TOOLWINDOW)

#define WM_FULLSCREEN_STYLE (WS_POPUP|WM_OVERRIDE_STYLE)
#define EX_FULLSCREEN_STYLE (WS_EX_APPWINDOW)

#define WM_TOPLEVEL_STYLE (WS_OVERLAPPEDWINDOW|WS_CLIPCHILDREN|CS_DBLCLKS)
#define EX_TOPLEVEL_STYLE (0)

#define WM_TRANSIENT_STYLE \
		(WS_POPUP|WS_CAPTION|WS_SYSMENU|WS_CLIPSIBLINGS|CS_DBLCLKS)
#define EX_TRANSIENT_STYLE (WS_EX_DLGMODALFRAME)

/*
 * The following structure is the official type record for geometry management
 * of top-level windows.
 */

static void		TopLevelReqProc(ClientData dummy, Tk_Window tkwin);
static void		RemapWindows(TkWindow *winPtr, HWND parentHWND);

static const Tk_GeomMgr wmMgrType = {
    "wm",			/* name */
    TopLevelReqProc,		/* requestProc */
    NULL,			/* lostSlaveProc */
};

typedef struct ThreadSpecificData {
    HPALETTE systemPalette;	/* System palette; refers to the currently
				 * installed foreground logical palette. */
    TkWindow *createWindow;	/* Window that is being constructed. This
				 * value is set immediately before a call to
				 * CreateWindowEx, and is used by SetLimits.
				 * This is a gross hack needed to work around
				 * Windows brain damage where it sends the
				 * WM_GETMINMAXINFO message before the
				 * WM_CREATE window. */
    int initialized;		/* Flag indicating whether thread-specific
				 * elements of module have been
				 * initialized. */
    int firstWindow;		/* Flag, cleared when the first window is
				 * mapped in a non-iconic state. */
    WinIconPtr iconPtr;		/* IconPtr being used as default for all
				 * toplevels, or NULL. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * The following variables cannot be placed in thread local storage because
 * they must be shared across threads.
 */

static int initialized;		/* Flag indicating whether module has been
				 * initialized. */

TCL_DECLARE_MUTEX(winWmMutex)

/*
 * Forward declarations for functions defined in this file:
 */

static int		ActivateWindow(Tcl_Event *evPtr, int flags);
static void		ConfigureTopLevel(WINDOWPOS *pos);
static void		GenerateConfigureNotify(TkWindow *winPtr);
static void		GenerateActivateEvent(TkWindow *winPtr, const int *flagPtr);
static void		GetMaxSize(WmInfo *wmPtr,
			    int *maxWidthPtr, int *maxHeightPtr);
static void		GetMinSize(WmInfo *wmPtr,
			    int *minWidthPtr, int *minHeightPtr);
static TkWindow *	GetTopLevel(HWND hwnd);
static void		InitWm(void);
static int		InstallColormaps(HWND hwnd, int message,
			    int isForemost);
static void		InvalidateSubTree(TkWindow *winPtr, Colormap colormap);
static void		InvalidateSubTreeDepth(TkWindow *winPtr);
static int		ParseGeometry(Tcl_Interp *interp, const char *string,
			    TkWindow *winPtr);
static void		RefreshColormap(Colormap colormap, TkDisplay *dispPtr);
static void		SetLimits(HWND hwnd, MINMAXINFO *info);
static void		TkWmStackorderToplevelWrapperMap(TkWindow *winPtr,
			    Display *display, Tcl_HashTable *table);
static LRESULT CALLBACK	TopLevelProc(HWND hwnd, UINT message,
			    WPARAM wParam, LPARAM lParam);
static void		TopLevelEventProc(ClientData clientData,
			    XEvent *eventPtr);
static void		TopLevelReqProc(ClientData dummy, Tk_Window tkwin);
static void		UpdateGeometryInfo(ClientData clientData);
static void		UpdateWrapper(TkWindow *winPtr);
static LRESULT CALLBACK	WmProc(HWND hwnd, UINT message,
			    WPARAM wParam, LPARAM lParam);
static void		WmWaitVisibilityOrMapProc(ClientData clientData,
			    XEvent *eventPtr);
static BlockOfIconImagesPtr ReadIconOrCursorFromFile(Tcl_Interp *interp,
			    Tcl_Obj* fileName, BOOL isIcon);
static WinIconPtr	ReadIconFromFile(Tcl_Interp *interp,
			    Tcl_Obj *fileName);
static WinIconPtr	GetIconFromPixmap(Display *dsPtr, Pixmap pixmap);
static int		ReadICOHeader(Tcl_Channel channel);
static BOOL		AdjustIconImagePointers(LPICONIMAGE lpImage);
static HICON		MakeIconOrCursorFromResource(LPICONIMAGE lpIcon,
			    BOOL isIcon);
static HICON		GetIcon(WinIconPtr titlebaricon, int icon_size);
static int		WinSetIcon(Tcl_Interp *interp,
			    WinIconPtr titlebaricon, Tk_Window tkw);
static void		FreeIconBlock(BlockOfIconImagesPtr lpIR);
static void		DecrIconRefCount(WinIconPtr titlebaricon);

static int		WmAspectCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmAttributesCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmClientCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmColormapwindowsCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmCommandCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmDeiconifyCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmFocusmodelCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmForgetCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmFrameCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmGeometryCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmGridCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmGroupCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconbitmapCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconifyCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconmaskCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconnameCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconphotoCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconpositionCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmIconwindowCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmManageCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmMaxsizeCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmMinsizeCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmOverrideredirectCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmPositionfromCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmProtocolCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmResizableCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmSizefromCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmStackorderCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmStateCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmTitleCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmTransientCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static int		WmWithdrawCmd(Tk_Window tkwin,
			    TkWindow *winPtr, Tcl_Interp *interp, int objc,
			    Tcl_Obj *const objv[]);
static void		WmUpdateGeom(WmInfo *wmPtr, TkWindow *winPtr);

/*
 * Used in BytesPerLine
 */

#define WIDTHBYTES(bits)	((((bits) + 31)>>5)<<2)

/*
 *----------------------------------------------------------------------
 *
 * DIBNumColors --
 *
 *	Calculates the number of entries in the color table, given by LPSTR
 *	lpbi - pointer to the CF_DIB memory block. Used by titlebar icon code.
 *
 * Results:
 *	WORD - Number of entries in the color table.
 *
 *----------------------------------------------------------------------
 */

static WORD
DIBNumColors(
    LPSTR lpbi)
{
    WORD wBitCount;
    DWORD dwClrUsed;

    dwClrUsed = ((LPBITMAPINFOHEADER) lpbi)->biClrUsed;

    if (dwClrUsed) {
	return (WORD) dwClrUsed;
    }

    wBitCount = ((LPBITMAPINFOHEADER) lpbi)->biBitCount;

    switch (wBitCount) {
    case 1:
	return 2;
    case 4:
	return 16;
    case 8:
	return 256;
    default:
	return 0;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PaletteSize --
 *
 *	Calculates the number of bytes in the color table, as given by LPSTR
 *	lpbi - pointer to the CF_DIB memory block. Used by titlebar icon code.
 *
 * Results:
 *	Number of bytes in the color table
 *
 *----------------------------------------------------------------------
 */
static WORD
PaletteSize(
    LPSTR lpbi)
{
    return (WORD) (DIBNumColors(lpbi) * sizeof(RGBQUAD));
}

/*
 *----------------------------------------------------------------------
 *
 * FindDIBits --
 *
 *	Locate the image bits in a CF_DIB format DIB, as given by LPSTR lpbi -
 *	pointer to the CF_DIB memory block. Used by titlebar icon code.
 *
 * Results:
 *	pointer to the image bits
 *
 * Side effects: None
 *
 *
 *----------------------------------------------------------------------
 */

static LPSTR
FindDIBBits(
    LPSTR lpbi)
{
    return lpbi + *((LPDWORD) lpbi) + PaletteSize(lpbi);
}

/*
 *----------------------------------------------------------------------
 *
 * BytesPerLine --
 *
 *	Calculates the number of bytes in one scan line, as given by
 *	LPBITMAPINFOHEADER lpBMIH - pointer to the BITMAPINFOHEADER that
 *	begins the CF_DIB block. Used by titlebar icon code.
 *
 * Results:
 *	number of bytes in one scan line (DWORD aligned)
 *
 *----------------------------------------------------------------------
 */

static DWORD
BytesPerLine(
    LPBITMAPINFOHEADER lpBMIH)
{
    return WIDTHBYTES(lpBMIH->biWidth * lpBMIH->biPlanes * lpBMIH->biBitCount);
}

/*
 *----------------------------------------------------------------------
 *
 * AdjustIconImagePointers --
 *
 *	Adjusts internal pointers in icon resource struct, as given by
 *	LPICONIMAGE lpImage - the resource to handle. Used by titlebar icon
 *	code.
 *
 * Results:
 *	BOOL - TRUE for success, FALSE for failure
 *
 *----------------------------------------------------------------------
 */

static BOOL
AdjustIconImagePointers(
    LPICONIMAGE lpImage)
{
    /*
     * Sanity check.
     */

    if (lpImage == NULL) {
	return FALSE;
    }

    /*
     * BITMAPINFO is at beginning of bits.
     */

    lpImage->lpbi = (LPBITMAPINFO) lpImage->lpBits;

    /*
     * Width - simple enough.
     */

    lpImage->Width = lpImage->lpbi->bmiHeader.biWidth;

    /*
     * Icons are stored in funky format where height is doubled so account for
     * that.
     */

    lpImage->Height = (lpImage->lpbi->bmiHeader.biHeight)/2;

    /*
     * How many colors?
     */

    lpImage->Colors = lpImage->lpbi->bmiHeader.biPlanes
	    * lpImage->lpbi->bmiHeader.biBitCount;

    /*
     * XOR bits follow the header and color table.
     */

    lpImage->lpXOR = (LPBYTE) FindDIBBits((LPSTR) lpImage->lpbi);

    /*
     * AND bits follow the XOR bits.
     */

    lpImage->lpAND = lpImage->lpXOR +
	    lpImage->Height*BytesPerLine((LPBITMAPINFOHEADER) lpImage->lpbi);
    return TRUE;
}

/*
 *----------------------------------------------------------------------
 *
 * MakeIconOrCursorFromResource --
 *
 *	Construct an actual HICON structure from the information in a
 *	resource.
 *
 * Results:
 *	Icon
 *
 *----------------------------------------------------------------------
 */

static HICON
MakeIconOrCursorFromResource(
    LPICONIMAGE lpIcon,
    BOOL isIcon)
{
    HICON hIcon;

    /*
     * Sanity Check
     */

    if (lpIcon == NULL || lpIcon->lpBits == NULL) {
	return NULL;
    }

    /*
     * Let the OS do the real work :)
     */

    hIcon = (HICON) CreateIconFromResourceEx(lpIcon->lpBits,
	    lpIcon->dwNumBytes, isIcon, 0x00030000,
	    (*(LPBITMAPINFOHEADER) lpIcon->lpBits).biWidth,
	    (*(LPBITMAPINFOHEADER) lpIcon->lpBits).biHeight/2, 0);

    /*
     * It failed, odds are good we're on NT so try the non-Ex way.
     */

    if (hIcon == NULL) {
	/*
	 * We would break on NT if we try with a 16bpp image.
	 */

	if (lpIcon->lpbi->bmiHeader.biBitCount != 16) {
	    hIcon = CreateIconFromResource(lpIcon->lpBits, lpIcon->dwNumBytes,
		    isIcon, 0x00030000);
	}
    }
    return hIcon;
}

/*
 *----------------------------------------------------------------------
 *
 * ReadICOHeader --
 *
 *	Reads the header from an ICO file, as specfied by channel.
 *
 * Results:
 *	UINT - Number of images in file, -1 for failure. If this succeeds,
 *	there is a decent chance this is a valid icon file.
 *
 *----------------------------------------------------------------------
 */

static int
ReadICOHeader(
    Tcl_Channel channel)
{
    union {
	WORD word;
	char bytes[sizeof(WORD)];
    } input;

    /*
     * Read the 'reserved' WORD, which should be a zero word.
     */

    if (Tcl_Read(channel, input.bytes, sizeof(WORD)) != sizeof(WORD)) {
	return -1;
    }
    if (input.word != 0) {
	return -1;
    }

    /*
     * Read the type WORD, which should be of type 1.
     */

    if (Tcl_Read(channel, input.bytes, sizeof(WORD)) != sizeof(WORD)) {
	return -1;
    }
    if (input.word != 1) {
	return -1;
    }

    /*
     * Get and return the count of images.
     */

    if (Tcl_Read(channel, input.bytes, sizeof(WORD)) != sizeof(WORD)) {
	return -1;
    }
    return (int) input.word;
}

/*
 *----------------------------------------------------------------------
 *
 * InitWindowClass --
 *
 *	This routine creates the Wm toplevel decorative frame class.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Registers a new window class.
 *
 *----------------------------------------------------------------------
 */

static int
InitWindowClass(
    WinIconPtr titlebaricon)
{
    ThreadSpecificData *tsdPtr =
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (!tsdPtr->initialized) {
	tsdPtr->initialized = 1;
	tsdPtr->firstWindow = 1;
	tsdPtr->iconPtr = NULL;
    }
    if (!initialized) {
	Tcl_MutexLock(&winWmMutex);
	if (!initialized) {
	    WNDCLASS class;

	    initialized = 1;

	    /*
	     * The only difference between WNDCLASSW and WNDCLASSA are in
	     * pointers, so we can use the generic structure WNDCLASS.
	     */

	    ZeroMemory(&class, sizeof(WNDCLASS));

	    class.style = CS_HREDRAW | CS_VREDRAW;
	    class.hInstance = Tk_GetHINSTANCE();
	    class.lpszClassName = TK_WIN_TOPLEVEL_CLASS_NAME;
	    class.lpfnWndProc = WmProc;
	    if (titlebaricon == NULL) {
		class.hIcon = LoadIcon(Tk_GetHINSTANCE(), TEXT("tk"));
	    } else {
		class.hIcon = GetIcon(titlebaricon, ICON_BIG);
		if (class.hIcon == NULL) {
		    return TCL_ERROR;
		}

		/*
		 * Store pointer to default icon so we know when we need to
		 * free that information
		 */

		tsdPtr->iconPtr = titlebaricon;
	    }
	    class.hCursor = LoadCursor(NULL, IDC_ARROW);

	    if (!RegisterClass(&class)) {
		Tcl_Panic("Unable to register TkTopLevel class");
	    }
	}
	Tcl_MutexUnlock(&winWmMutex);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * InitWm --
 *
 *	This initialises the window manager
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Registers a new window class.
 *
 *----------------------------------------------------------------------
 */

static void
InitWm(void)
{
    /* Ignore return result */
    (void) InitWindowClass(NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * WinSetIcon --
 *
 *	Sets either the default toplevel titlebar icon, or the icon for a
 *	specific toplevel (if tkw is given, then only that window is used).
 *
 *	The ref-count of the titlebaricon is NOT changed. If this function
 *	returns successfully, the caller should assume the icon was used (and
 *	therefore the ref-count should be adjusted to reflect that fact). If
 *	the function returned an error, the caller should assume the icon was
 *	not used (and may wish to free the memory associated with it).
 *
 * Results:
 *	A standard Tcl return code.
 *
 * Side effects:
 *	One or all windows may have their icon changed. The Tcl result may be
 *	modified. The window-manager will be initialised if it wasn't already.
 *	The given window will be forced into existence.
 *
 *----------------------------------------------------------------------
 */

static int
WinSetIcon(
    Tcl_Interp *interp,
    WinIconPtr titlebaricon,
    Tk_Window tkw)
{
    WmInfo *wmPtr;
    HWND hwnd;
    int application = 0;

    if (tkw == NULL) {
	tkw = Tk_MainWindow(interp);
	application = 1;
    }

    if (!(Tk_IsTopLevel(tkw))) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"window \"%s\" isn't a top-level window", Tk_PathName(tkw)));
	Tcl_SetErrorCode(interp, "TK", "LOOKUP", "TOPLEVEL", Tk_PathName(tkw),
		NULL);
	return TCL_ERROR;
    }
    if (Tk_WindowId(tkw) == None) {
	Tk_MakeWindowExist(tkw);
    }

    /*
     * We must get the window's wrapper, not the window itself.
     */

    wmPtr = ((TkWindow *) tkw)->wmInfoPtr;
    hwnd = wmPtr->wrapper;

    if (application) {
	if (hwnd == NULL) {
	    /*
	     * I don't actually think this is ever the correct thing, unless
	     * perhaps the window doesn't have a wrapper. But I believe all
	     * windows have wrappers.
	     */

	    hwnd = Tk_GetHWND(Tk_WindowId(tkw));
	}

	/*
	 * If we aren't initialised, then just initialise with the user's
	 * icon. Otherwise our icon choice will be ignored moments later when
	 * Tk finishes initialising.
	 */

	if (!initialized) {
	    if (InitWindowClass(titlebaricon) != TCL_OK) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"Unable to set icon", -1));
		Tcl_SetErrorCode(interp, "TK", "WM", "ICON", "FAILED", NULL);
		return TCL_ERROR;
	    }
	} else {
	    ThreadSpecificData *tsdPtr;

	    /*
	     * Don't check return result of SetClassLong() or
	     * SetClassLongPtr() since they return the previously set value
	     * which is zero on the initial call or in an error case. The MSDN
	     * documentation does not indicate that the result needs to be
	     * checked.
	     */

	    SetClassLongPtr(hwnd, GCLP_HICONSM,
		    (LPARAM) GetIcon(titlebaricon, ICON_SMALL));
	    SetClassLongPtr(hwnd, GCLP_HICON,
		    (LPARAM) GetIcon(titlebaricon, ICON_BIG));
	    tsdPtr = (ThreadSpecificData *)
		    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
	    if (tsdPtr->iconPtr != NULL) {
		DecrIconRefCount(tsdPtr->iconPtr);
	    }
	    tsdPtr->iconPtr = titlebaricon;
	}
    } else {
	if (!initialized) {
	    /*
	     * Need to initialise the wm otherwise we will fail on code which
	     * tries to set a toplevel's icon before that happens. Ignore
	     * return result.
	     */

	    (void) InitWindowClass(NULL);
	}

	/*
	 * The following code is exercised if you do
	 *
	 *	toplevel .t ; wm titlebaricon .t foo.icr
	 *
	 * i.e. the wm hasn't had time to properly create the '.t' window
	 * before you set the icon.
	 */

	if (hwnd == NULL) {
	    /*
	     * This little snippet is copied from the 'Map' function, and
	     * should probably be placed in one proper location.
	     */

	    UpdateWrapper(wmPtr->winPtr);
	    wmPtr = ((TkWindow *) tkw)->wmInfoPtr;
	    hwnd = wmPtr->wrapper;
	    if (hwnd == NULL) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"Can't set icon; window has no wrapper.", -1));
		Tcl_SetErrorCode(interp, "TK", "WM", "ICON", "WRAPPER", NULL);
		return TCL_ERROR;
	    }
	}
	SendMessage(hwnd, WM_SETICON, ICON_SMALL,
		(LPARAM) GetIcon(titlebaricon, ICON_SMALL));
	SendMessage(hwnd, WM_SETICON, ICON_BIG,
		(LPARAM) GetIcon(titlebaricon, ICON_BIG));

	/*
	 * Update the iconPtr we keep for each WmInfo structure.
	 */

	if (wmPtr->iconPtr != NULL) {
	    /*
	     * Free any old icon ptr which is associated with this window.
	     */

	    DecrIconRefCount(wmPtr->iconPtr);
	}

	/*
	 * We do not need to increment the ref count for the titlebaricon,
	 * because it was already incremented when we retrieved it.
	 */

	wmPtr->iconPtr = titlebaricon;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinGetIcon --
 *
 *	Gets either the default toplevel titlebar icon, or the icon for a
 *	specific toplevel (ICON_SMALL or ICON_BIG).
 *
 * Results:
 *	A Windows HICON.
 *
 * Side effects:


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