window.c 80.6 KB
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/*
 * Server-side window handling
 *
 * Copyright (C) 2001 Alexandre Julliard
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 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */

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#include "config.h"
#include "wine/port.h"

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#include <assert.h>
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#include <stdarg.h>
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#include "ntstatus.h"
#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
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#include "winternl.h"
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#include "object.h"
#include "request.h"
#include "thread.h"
#include "process.h"
#include "user.h"
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#include "unicode.h"
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/* a window property */
struct property
{
    unsigned short type;     /* property type (see below) */
    atom_t         atom;     /* property atom */
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    obj_handle_t   handle;   /* property handle (user-defined storage) */
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};

enum property_type
{
    PROP_TYPE_FREE,   /* free entry */
    PROP_TYPE_STRING, /* atom that was originally a string */
    PROP_TYPE_ATOM    /* plain atom */
};


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struct window
{
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    struct window   *parent;          /* parent window */
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    user_handle_t    owner;           /* owner of this window */
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    struct list      children;        /* list of children in Z-order */
    struct list      unlinked;        /* list of children not linked in the Z-order list */
    struct list      entry;           /* entry in parent's children list */
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    user_handle_t    handle;          /* full handle for this window */
    struct thread   *thread;          /* thread owning the window */
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    struct desktop  *desktop;         /* desktop that the window belongs to */
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    struct window_class *class;       /* window class */
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    atom_t           atom;            /* class atom */
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    user_handle_t    last_active;     /* last active popup */
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    rectangle_t      window_rect;     /* window rectangle (relative to parent client area) */
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    rectangle_t      visible_rect;    /* visible part of window rect (relative to parent client area) */
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    rectangle_t      client_rect;     /* client rectangle (relative to parent client area) */
    struct region   *win_region;      /* region for shaped windows (relative to window rect) */
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    struct region   *update_region;   /* update region (relative to window rect) */
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    unsigned int     style;           /* window style */
    unsigned int     ex_style;        /* window extended style */
    unsigned int     id;              /* window id */
    void*            instance;        /* creator instance */
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    unsigned int     is_unicode : 1;  /* ANSI or unicode */
    unsigned int     is_linked : 1;   /* is it linked into the parent z-order list? */
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    unsigned int     is_layered : 1;  /* has layered info been set? */
    unsigned int     color_key;       /* color key for a layered window */
    unsigned int     alpha;           /* alpha value for a layered window */
    unsigned int     layered_flags;   /* flags for a layered window */
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    unsigned long    user_data;       /* user-specific data */
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    WCHAR           *text;            /* window caption text */
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    unsigned int     paint_flags;     /* various painting flags */
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    int              prop_inuse;      /* number of in-use window properties */
    int              prop_alloc;      /* number of allocated window properties */
    struct property *properties;      /* window properties array */
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    int              nb_extra_bytes;  /* number of extra bytes */
    char             extra_bytes[1];  /* extra bytes storage */
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};

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#define PAINT_INTERNAL      0x01  /* internal WM_PAINT pending */
#define PAINT_ERASE         0x02  /* needs WM_ERASEBKGND */
#define PAINT_NONCLIENT     0x04  /* needs WM_NCPAINT */
#define PAINT_DELAYED_ERASE 0x08  /* still needs erase after WM_ERASEBKGND */
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/* growable array of user handles */
struct user_handle_array
{
    user_handle_t *handles;
    int            count;
    int            total;
};

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/* global window pointers */
static struct window *shell_window;
static struct window *shell_listview;
static struct window *progman_window;
static struct window *taskman_window;
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/* magic HWND_TOP etc. pointers */
#define WINPTR_TOP       ((struct window *)1L)
#define WINPTR_BOTTOM    ((struct window *)2L)
#define WINPTR_TOPMOST   ((struct window *)3L)
#define WINPTR_NOTOPMOST ((struct window *)4L)

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/* retrieve a pointer to a window from its handle */
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static inline struct window *get_window( user_handle_t handle )
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{
    struct window *ret = get_user_object( handle, USER_WINDOW );
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    if (!ret) set_win32_error( ERROR_INVALID_WINDOW_HANDLE );
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    return ret;
}

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/* check if window is the desktop */
static inline int is_desktop_window( const struct window *win )
{
    return !win->parent;  /* only desktop windows have no parent */
}

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/* get next window in Z-order list */
static inline struct window *get_next_window( struct window *win )
{
    struct list *ptr = list_next( &win->parent->children, &win->entry );
    return ptr ? LIST_ENTRY( ptr, struct window, entry ) : NULL;
}

/* get previous window in Z-order list */
static inline struct window *get_prev_window( struct window *win )
{
    struct list *ptr = list_prev( &win->parent->children, &win->entry );
    return ptr ? LIST_ENTRY( ptr, struct window, entry ) : NULL;
}

/* get first child in Z-order list */
static inline struct window *get_first_child( struct window *win )
{
    struct list *ptr = list_head( &win->children );
    return ptr ? LIST_ENTRY( ptr, struct window, entry ) : NULL;
}

/* get last child in Z-order list */
static inline struct window *get_last_child( struct window *win )
{
    struct list *ptr = list_tail( &win->children );
    return ptr ? LIST_ENTRY( ptr, struct window, entry ) : NULL;
}

/* link a window at the right place in the siblings list */
static void link_window( struct window *win, struct window *previous )
{
    if (previous == WINPTR_NOTOPMOST)
    {
        if (!(win->ex_style & WS_EX_TOPMOST) && win->is_linked) return;  /* nothing to do */
        win->ex_style &= ~WS_EX_TOPMOST;
        previous = WINPTR_TOP;  /* fallback to the HWND_TOP case */
    }

    list_remove( &win->entry );  /* unlink it from the previous location */

    if (previous == WINPTR_BOTTOM)
    {
        list_add_tail( &win->parent->children, &win->entry );
        win->ex_style &= ~WS_EX_TOPMOST;
    }
    else if (previous == WINPTR_TOPMOST)
    {
        list_add_head( &win->parent->children, &win->entry );
        win->ex_style |= WS_EX_TOPMOST;
    }
    else if (previous == WINPTR_TOP)
    {
        struct list *entry = win->parent->children.next;
        if (!(win->ex_style & WS_EX_TOPMOST))  /* put it above the first non-topmost window */
        {
            while (entry != &win->parent->children &&
                   LIST_ENTRY( entry, struct window, entry )->ex_style & WS_EX_TOPMOST)
                entry = entry->next;
        }
        list_add_before( entry, &win->entry );
    }
    else
    {
        list_add_after( &previous->entry, &win->entry );
        if (!(previous->ex_style & WS_EX_TOPMOST)) win->ex_style &= ~WS_EX_TOPMOST;
        else
        {
            struct window *next = get_next_window( win );
            if (next && (next->ex_style & WS_EX_TOPMOST)) win->ex_style |= WS_EX_TOPMOST;
        }
    }

    win->is_linked = 1;
}

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/* change the parent of a window (or unlink the window if the new parent is NULL) */
static int set_parent_window( struct window *win, struct window *parent )
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{
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    struct window *ptr;

    /* make sure parent is not a child of window */
    for (ptr = parent; ptr; ptr = ptr->parent)
    {
        if (ptr == win)
        {
            set_error( STATUS_INVALID_PARAMETER );
            return 0;
        }
    }

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    if (parent)
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    {
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        win->parent = parent;
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        link_window( win, WINPTR_TOP );
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        /* if parent belongs to a different thread and the window isn't */
        /* top-level, attach the two threads */
        if (parent->thread && parent->thread != win->thread && !is_desktop_window(parent))
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            attach_thread_input( win->thread, parent->thread );
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    }
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    else  /* move it to parent unlinked list */
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    {
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        list_remove( &win->entry );  /* unlink it from the previous location */
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        list_add_head( &win->parent->unlinked, &win->entry );
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        win->is_linked = 0;
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    }
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    return 1;
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}

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/* append a user handle to a handle array */
static int add_handle_to_array( struct user_handle_array *array, user_handle_t handle )
{
    if (array->count >= array->total)
    {
        int new_total = max( array->total * 2, 32 );
        user_handle_t *new_array = realloc( array->handles, new_total * sizeof(*new_array) );
        if (!new_array)
        {
            free( array->handles );
            set_error( STATUS_NO_MEMORY );
            return 0;
        }
        array->handles = new_array;
        array->total = new_total;
    }
    array->handles[array->count++] = handle;
    return 1;
}

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/* set a window property */
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static void set_property( struct window *win, atom_t atom, obj_handle_t handle, enum property_type type )
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{
    int i, free = -1;
    struct property *new_props;

    /* check if it exists already */
    for (i = 0; i < win->prop_inuse; i++)
    {
        if (win->properties[i].type == PROP_TYPE_FREE)
        {
            free = i;
            continue;
        }
        if (win->properties[i].atom == atom)
        {
            win->properties[i].type = type;
            win->properties[i].handle = handle;
            return;
        }
    }

    /* need to add an entry */
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    if (!grab_global_atom( NULL, atom )) return;
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    if (free == -1)
    {
        /* no free entry */
        if (win->prop_inuse >= win->prop_alloc)
        {
            /* need to grow the array */
            if (!(new_props = realloc( win->properties,
                                       sizeof(*new_props) * (win->prop_alloc + 16) )))
            {
                set_error( STATUS_NO_MEMORY );
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                release_global_atom( NULL, atom );
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                return;
            }
            win->prop_alloc += 16;
            win->properties = new_props;
        }
        free = win->prop_inuse++;
    }
    win->properties[free].atom   = atom;
    win->properties[free].type   = type;
    win->properties[free].handle = handle;
}

/* remove a window property */
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static obj_handle_t remove_property( struct window *win, atom_t atom )
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{
    int i;

    for (i = 0; i < win->prop_inuse; i++)
    {
        if (win->properties[i].type == PROP_TYPE_FREE) continue;
        if (win->properties[i].atom == atom)
        {
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            release_global_atom( NULL, atom );
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            win->properties[i].type = PROP_TYPE_FREE;
            return win->properties[i].handle;
        }
    }
    /* FIXME: last error? */
    return 0;
}

/* find a window property */
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static obj_handle_t get_property( struct window *win, atom_t atom )
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{
    int i;

    for (i = 0; i < win->prop_inuse; i++)
    {
        if (win->properties[i].type == PROP_TYPE_FREE) continue;
        if (win->properties[i].atom == atom) return win->properties[i].handle;
    }
    /* FIXME: last error? */
    return 0;
}

/* destroy all properties of a window */
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static inline void destroy_properties( struct window *win )
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{
    int i;

    if (!win->properties) return;
    for (i = 0; i < win->prop_inuse; i++)
    {
        if (win->properties[i].type == PROP_TYPE_FREE) continue;
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        release_global_atom( NULL, win->properties[i].atom );
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    }
    free( win->properties );
}

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/* detach a window from its owner thread but keep the window around */
static void detach_window_thread( struct window *win )
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{
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    struct thread *thread = win->thread;

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    if (!thread) return;
    if (thread->queue)
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    {
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        if (win->update_region) inc_queue_paint_count( thread, -1 );
        if (win->paint_flags & PAINT_INTERNAL) inc_queue_paint_count( thread, -1 );
        queue_cleanup_window( thread, win->handle );
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    }
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    assert( thread->desktop_users > 0 );
    thread->desktop_users--;
    release_class( win->class );
    win->class = NULL;

    /* don't hold a reference to the desktop so that the desktop window can be */
    /* destroyed when the desktop ref count reaches zero */
    release_object( win->desktop );
    win->thread = NULL;
}

/* destroy a window */
void destroy_window( struct window *win )
{
    /* destroy all children */
    while (!list_empty(&win->children))
        destroy_window( LIST_ENTRY( list_head(&win->children), struct window, entry ));
    while (!list_empty(&win->unlinked))
        destroy_window( LIST_ENTRY( list_head(&win->unlinked), struct window, entry ));
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    /* reset global window pointers, if the corresponding window is destroyed */
    if (win == shell_window) shell_window = NULL;
    if (win == shell_listview) shell_listview = NULL;
    if (win == progman_window) progman_window = NULL;
    if (win == taskman_window) taskman_window = NULL;
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    free_user_handle( win->handle );
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    destroy_properties( win );
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    list_remove( &win->entry );
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    if (is_desktop_window(win))
    {
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        struct desktop *desktop = win->desktop;
        assert( desktop->top_window == win || desktop->msg_window == win );
        if (desktop->top_window == win) desktop->top_window = NULL;
        else desktop->msg_window = NULL;
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    }
    detach_window_thread( win );
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    if (win->win_region) free_region( win->win_region );
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    if (win->update_region) free_region( win->update_region );
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    if (win->class) release_class( win->class );
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    free( win->text );
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    memset( win, 0x55, sizeof(*win) + win->nb_extra_bytes - 1 );
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    free( win );
}

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/* get the process owning the top window of a given desktop */
struct process *get_top_window_owner( struct desktop *desktop )
{
    struct window *win = desktop->top_window;
    if (!win || !win->thread) return NULL;
    return win->thread->process;
}

/* attempt to close the desktop window when the last process using it is gone */
void close_desktop_window( struct desktop *desktop )
{
    struct window *win = desktop->top_window;
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    if (win && win->thread) post_message( win->handle, WM_CLOSE, 0, 0 );
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}

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/* create a new window structure (note: the window is not linked in the window tree) */
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static struct window *create_window( struct window *parent, struct window *owner,
                                     atom_t atom, void *instance )
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{
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    static const rectangle_t empty_rect;
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    int extra_bytes;
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    struct window *win = NULL;
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    struct desktop *desktop;
    struct window_class *class;

    if (!(desktop = get_thread_desktop( current, DESKTOP_CREATEWINDOW ))) return NULL;
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    if (!(class = grab_class( current->process, atom, instance, &extra_bytes )))
    {
        release_object( desktop );
        return NULL;
    }
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    if (!parent)  /* null parent is only allowed for desktop or HWND_MESSAGE top window */
    {
        if (is_desktop_class( class ))
            parent = desktop->top_window;  /* use existing desktop if any */
        else if (is_hwnd_message_class( class ))
            /* use desktop window if message window is already created */
            parent = desktop->msg_window ? desktop->top_window : NULL;
        else if (!(parent = desktop->top_window))  /* must already have a desktop then */
        {
            set_error( STATUS_ACCESS_DENIED );
            goto failed;
        }
    }

    /* parent must be on the same desktop */
    if (parent && parent->desktop != desktop)
    {
        set_error( STATUS_ACCESS_DENIED );
        goto failed;
    }

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    if (!(win = mem_alloc( sizeof(*win) + extra_bytes - 1 ))) goto failed;
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    if (!(win->handle = alloc_user_handle( win, USER_WINDOW ))) goto failed;
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    win->parent         = parent;
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    win->owner          = owner ? owner->handle : 0;
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    win->thread         = current;
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    win->desktop        = desktop;
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    win->class          = class;
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    win->atom           = atom;
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    win->last_active    = win->handle;
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    win->win_region     = NULL;
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    win->update_region  = NULL;
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    win->style          = 0;
    win->ex_style       = 0;
    win->id             = 0;
    win->instance       = NULL;
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    win->is_unicode     = 1;
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    win->is_linked      = 0;
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    win->is_layered     = 0;
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    win->user_data      = 0;
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    win->text           = NULL;
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    win->paint_flags    = 0;
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    win->prop_inuse     = 0;
    win->prop_alloc     = 0;
    win->properties     = NULL;
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    win->nb_extra_bytes = extra_bytes;
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    win->window_rect = win->visible_rect = win->client_rect = empty_rect;
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    memset( win->extra_bytes, 0, extra_bytes );
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    list_init( &win->children );
    list_init( &win->unlinked );
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    /* if parent belongs to a different thread and the window isn't */
    /* top-level, attach the two threads */
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    if (parent && parent->thread && parent->thread != current && !is_desktop_window(parent))
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    {
        if (!attach_thread_input( current, parent->thread )) goto failed;
    }
    else  /* otherwise just make sure that the thread has a message queue */
    {
        if (!current->queue && !init_thread_queue( current )) goto failed;
    }

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    /* put it on parent unlinked list */
    if (parent) list_add_head( &parent->unlinked, &win->entry );
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    else
    {
        list_init( &win->entry );
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        if (is_desktop_class( class ))
        {
            assert( !desktop->top_window );
            desktop->top_window = win;
            set_process_default_desktop( current->process, desktop, current->desktop );
        }
        else
        {
            assert( !desktop->msg_window );
            desktop->msg_window = win;
        }
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    }
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    current->desktop_users++;
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    return win;
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failed:
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    if (win)
    {
        if (win->handle) free_user_handle( win->handle );
        free( win );
    }
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    release_object( desktop );
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    release_class( class );
    return NULL;
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}

/* destroy all windows belonging to a given thread */
void destroy_thread_windows( struct thread *thread )
{
    user_handle_t handle = 0;
    struct window *win;

    while ((win = next_user_handle( &handle, USER_WINDOW )))
    {
        if (win->thread != thread) continue;
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        if (is_desktop_window( win )) detach_window_thread( win );
        else destroy_window( win );
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    }
}

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/* get the desktop window */
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static struct window *get_desktop_window( struct thread *thread )
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{
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    struct window *top_window;
    struct desktop *desktop = get_thread_desktop( thread, 0 );

    if (!desktop) return NULL;
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    top_window = desktop->top_window;
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    release_object( desktop );
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    return top_window;
}

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/* check whether child is a descendant of parent */
int is_child_window( user_handle_t parent, user_handle_t child )
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{
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    struct window *child_ptr = get_user_object( child, USER_WINDOW );
    struct window *parent_ptr = get_user_object( parent, USER_WINDOW );
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    if (!child_ptr || !parent_ptr) return 0;
    while (child_ptr->parent)
    {
        if (child_ptr->parent == parent_ptr) return 1;
        child_ptr = child_ptr->parent;
    }
    return 0;
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}

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/* check whether window is a top-level window */
int is_top_level_window( user_handle_t window )
{
    struct window *win = get_user_object( window, USER_WINDOW );
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    return (win && (is_desktop_window(win) || is_desktop_window(win->parent)));
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}

/* make a window active if possible */
int make_window_active( user_handle_t window )
{
    struct window *owner, *win = get_window( window );

    if (!win) return 0;

    /* set last active for window and its owner */
    win->last_active = win->handle;
    if ((owner = get_user_object( win->owner, USER_WINDOW ))) owner->last_active = win->handle;
    return 1;
}

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/* increment (or decrement) the window paint count */
static inline void inc_window_paint_count( struct window *win, int incr )
{
    if (win->thread) inc_queue_paint_count( win->thread, incr );
}

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/* check if window and all its ancestors are visible */
static int is_visible( const struct window *win )
{
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    while (win)
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    {
        if (!(win->style & WS_VISIBLE)) return 0;
        win = win->parent;
        /* if parent is minimized children are not visible */
        if (win && (win->style & WS_MINIMIZE)) return 0;
    }
    return 1;
}

/* same as is_visible but takes a window handle */
int is_window_visible( user_handle_t window )
{
    struct window *win = get_user_object( window, USER_WINDOW );
    if (!win) return 0;
    return is_visible( win );
}

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/* check if point is inside the window */
static inline int is_point_in_window( struct window *win, int x, int y )
{
    if (!(win->style & WS_VISIBLE)) return 0; /* not visible */
    if ((win->style & (WS_POPUP|WS_CHILD|WS_DISABLED)) == (WS_CHILD|WS_DISABLED))
        return 0;  /* disabled child */
    if ((win->ex_style & (WS_EX_LAYERED|WS_EX_TRANSPARENT)) == (WS_EX_LAYERED|WS_EX_TRANSPARENT))
        return 0;  /* transparent */
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    if (x < win->visible_rect.left || x >= win->visible_rect.right ||
        y < win->visible_rect.top || y >= win->visible_rect.bottom)
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        return 0;  /* not in window */
    if (win->win_region &&
        !point_in_region( win->win_region, x - win->window_rect.left, y - win->window_rect.top ))
        return 0;  /* not in window region */
    return 1;
}

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/* fill an array with the handles of the children of a specified window */
static unsigned int get_children_windows( struct window *parent, atom_t atom, thread_id_t tid,
                                          user_handle_t *handles, unsigned int max_count )
{
    struct window *ptr;
    unsigned int count = 0;

    if (!parent) return 0;

    LIST_FOR_EACH_ENTRY( ptr, &parent->children, struct window, entry )
    {
        if (atom && get_class_atom(ptr->class) != atom) continue;
        if (tid && get_thread_id(ptr->thread) != tid) continue;
        if (handles)
        {
            if (count >= max_count) break;
            handles[count] = ptr->handle;
        }
        count++;
    }
    return count;
}

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/* find child of 'parent' that contains the given point (in parent-relative coords) */
static struct window *child_window_from_point( struct window *parent, int x, int y )
{
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    struct window *ptr;
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    LIST_FOR_EACH_ENTRY( ptr, &parent->children, struct window, entry )
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    {
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        if (!is_point_in_window( ptr, x, y )) continue;  /* skip it */
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        /* if window is minimized or disabled, return at once */
        if (ptr->style & (WS_MINIMIZE|WS_DISABLED)) return ptr;

        /* if point is not in client area, return at once */
        if (x < ptr->client_rect.left || x >= ptr->client_rect.right ||
            y < ptr->client_rect.top || y >= ptr->client_rect.bottom)
            return ptr;

        return child_window_from_point( ptr, x - ptr->client_rect.left, y - ptr->client_rect.top );
    }
    return parent;  /* not found any child */
}

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/* find all children of 'parent' that contain the given point */
static int get_window_children_from_point( struct window *parent, int x, int y,
                                           struct user_handle_array *array )
{
    struct window *ptr;

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    LIST_FOR_EACH_ENTRY( ptr, &parent->children, struct window, entry )
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    {
        if (!is_point_in_window( ptr, x, y )) continue;  /* skip it */

        /* if point is in client area, and window is not minimized or disabled, check children */
        if (!(ptr->style & (WS_MINIMIZE|WS_DISABLED)) &&
            x >= ptr->client_rect.left && x < ptr->client_rect.right &&
            y >= ptr->client_rect.top && y < ptr->client_rect.bottom)
        {
            if (!get_window_children_from_point( ptr, x - ptr->client_rect.left,
                                                 y - ptr->client_rect.top, array ))
                return 0;
        }

        /* now add window to the array */
        if (!add_handle_to_array( array, ptr->handle )) return 0;
    }
    return 1;
}

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/* find window containing point (in absolute coords) */
719
user_handle_t window_from_point( struct desktop *desktop, int x, int y )
720
{
721
    struct window *ret;
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    if (!desktop->top_window) return 0;
    ret = child_window_from_point( desktop->top_window, x, y );
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    return ret->handle;
}
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/* return list of all windows containing point (in absolute coords) */
static int all_windows_from_point( struct window *top, int x, int y, struct user_handle_array *array )
{
    struct window *ptr;

    /* make point relative to top window */
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    for (ptr = top->parent; ptr && !is_desktop_window(ptr); ptr = ptr->parent)
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    {
        x -= ptr->client_rect.left;
        y -= ptr->client_rect.top;
    }

    if (!is_point_in_window( top, x, y )) return 1;

    /* if point is in client area, and window is not minimized or disabled, check children */
    if (!(top->style & (WS_MINIMIZE|WS_DISABLED)) &&
        x >= top->client_rect.left && x < top->client_rect.right &&
        y >= top->client_rect.top && y < top->client_rect.bottom)
    {
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        if (!is_desktop_window(top))
        {
            x -= top->client_rect.left;
            y -= top->client_rect.top;
        }
        if (!get_window_children_from_point( top, x, y, array )) return 0;
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    }
    /* now add window to the array */
    if (!add_handle_to_array( array, top->handle )) return 0;
    return 1;
}


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/* return the thread owning a window */
struct thread *get_window_thread( user_handle_t handle )
{
    struct window *win = get_user_object( handle, USER_WINDOW );
    if (!win || !win->thread) return NULL;
    return (struct thread *)grab_object( win->thread );
}
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/* check if any area of a window needs repainting */
static inline int win_needs_repaint( struct window *win )
{
    return win->update_region || (win->paint_flags & PAINT_INTERNAL);
}


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/* find a child of the specified window that needs repainting */
static struct window *find_child_to_repaint( struct window *parent, struct thread *thread )
{
    struct window *ptr, *ret = NULL;

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    LIST_FOR_EACH_ENTRY( ptr, &parent->children, struct window, entry )
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    {
        if (!(ptr->style & WS_VISIBLE)) continue;
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        if (ptr->thread == thread && win_needs_repaint( ptr ))
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            ret = ptr;
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        else if (!(ptr->style & WS_MINIMIZE)) /* explore its children */
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            ret = find_child_to_repaint( ptr, thread );
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        if (ret) break;
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    }

    if (ret && (ret->ex_style & WS_EX_TRANSPARENT))
    {
        /* transparent window, check for non-transparent sibling to paint first */
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        for (ptr = get_next_window(ret); ptr; ptr = get_next_window(ptr))
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        {
            if (!(ptr->style & WS_VISIBLE)) continue;
            if (ptr->ex_style & WS_EX_TRANSPARENT) continue;
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            if (ptr->thread != thread) continue;
            if (win_needs_repaint( ptr )) return ptr;
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        }
    }
    return ret;
}


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/* find a window that needs to receive a WM_PAINT; also clear its internal paint flag */
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user_handle_t find_window_to_repaint( user_handle_t parent, struct thread *thread )
{
809
    struct window *ptr, *win, *top_window = get_desktop_window( thread );
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    if (!top_window) return 0;
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    if (top_window->thread == thread && win_needs_repaint( top_window )) win = top_window;
    else win = find_child_to_repaint( top_window, thread );

816
    if (win && parent)
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    {
        /* check that it is a child of the specified parent */
        for (ptr = win; ptr; ptr = ptr->parent)
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            if (ptr->handle == parent) break;
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        /* otherwise don't return any window, we don't repaint a child before its parent */
822
        if (!ptr) win = NULL;
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    }
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    if (!win) return 0;
    win->paint_flags &= ~PAINT_INTERNAL;
    return win->handle;
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}


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/* intersect the window region with the specified region, relative to the window parent */
static struct region *intersect_window_region( struct region *region, struct window *win )
{
    /* make region relative to window rect */
    offset_region( region, -win->window_rect.left, -win->window_rect.top );
    if (!intersect_region( region, region, win->win_region )) return NULL;
    /* make region relative to parent again */
    offset_region( region, win->window_rect.left, win->window_rect.top );
    return region;
}


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/* convert coordinates from client to screen coords */
static inline void client_to_screen( struct window *win, int *x, int *y )
{
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    for ( ; win && !is_desktop_window(win); win = win->parent)
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    {
        *x += win->client_rect.left;
        *y += win->client_rect.top;
    }
}

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/* convert coordinates from client to screen coords */
static inline void client_to_screen_rect( struct window *win, rectangle_t *rect )
{
    for ( ; win && !is_desktop_window(win); win = win->parent)
    {
        rect->left   += win->client_rect.left;
        rect->right  += win->client_rect.left;
        rect->top    += win->client_rect.top;
        rect->bottom += win->client_rect.top;
    }
}

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/* map the region from window to screen coordinates */
static inline void map_win_region_to_screen( struct window *win, struct region *region )
{
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    if (!is_desktop_window(win))
    {
        int x = win->window_rect.left;
        int y = win->window_rect.top;
        client_to_screen( win->parent, &x, &y );
        offset_region( region, x, y );
    }
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}


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/* clip all children of a given window out of the visible region */
static struct region *clip_children( struct window *parent, struct window *last,
                                     struct region *region, int offset_x, int offset_y )
{
    struct window *ptr;
    struct region *tmp = create_empty_region();

    if (!tmp) return NULL;
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    LIST_FOR_EACH_ENTRY( ptr, &parent->children, struct window, entry )
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    {
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        if (ptr == last) break;
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        if (!(ptr->style & WS_VISIBLE)) continue;
        if (ptr->ex_style & WS_EX_TRANSPARENT) continue;
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        set_region_rect( tmp, &ptr->visible_rect );
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        if (ptr->win_region && !intersect_window_region( tmp, ptr ))
        {
            free_region( tmp );
            return NULL;
        }
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        offset_region( tmp, offset_x, offset_y );
        if (!(region = subtract_region( region, region, tmp ))) break;
        if (is_region_empty( region )) break;
    }
    free_region( tmp );
    return region;
}


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/* compute the intersection of two rectangles; return 0 if the result is empty */
static inline int intersect_rect( rectangle_t *dst, const rectangle_t *src1, const rectangle_t *src2 )
{
    dst->left   = max( src1->left, src2->left );
    dst->top    = max( src1->top, src2->top );
    dst->right  = min( src1->right, src2->right );
    dst->bottom = min( src1->bottom, src2->bottom );
    return (dst->left < dst->right && dst->top < dst->bottom);
}


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/* offset the coordinates of a rectangle */
static inline void offset_rect( rectangle_t *rect, int offset_x, int offset_y )
{
    rect->left   += offset_x;
    rect->top    += offset_y;
    rect->right  += offset_x;
    rect->bottom += offset_y;
}


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/* set the region to the client rect clipped by the window rect, in parent-relative coordinates */
static void set_region_client_rect( struct region *region, struct window *win )
{
    rectangle_t rect;

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    intersect_rect( &rect, &win->window_rect, &win->client_rect );
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    set_region_rect( region, &rect );
}


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/* get the top-level window to clip against for a given window */
static inline struct window *get_top_clipping_window( struct window *win )
{
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    while (win->parent && !is_desktop_window(win->parent)) win = win->parent;
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    return win;
}


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/* compute the visible region of a window, in window coordinates */
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static struct region *get_visible_region( struct window *win, unsigned int flags )
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{
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    struct region *tmp = NULL, *region;
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    int offset_x, offset_y;

    if (!(region = create_empty_region())) return NULL;

    /* first check if all ancestors are visible */

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    if (!is_visible( win )) return region;  /* empty region */
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    /* create a region relative to the window itself */
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    if ((flags & DCX_PARENTCLIP) && win->parent && !is_desktop_window(win->parent))
959
    {
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        set_region_client_rect( region, win->parent );
        offset_region( region, -win->parent->client_rect.left, -win->parent->client_rect.top );
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    }
    else if (flags & DCX_WINDOW)
    {
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        set_region_rect( region, &win->visible_rect );
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        if (win->win_region && !intersect_window_region( region, win )) goto error;
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    }
    else
    {
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        set_region_client_rect( region, win );
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        if (win->win_region && !intersect_window_region( region, win )) goto error;
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    }

    /* clip children */

    if (flags & DCX_CLIPCHILDREN)
    {
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        if (is_desktop_window(win)) offset_x = offset_y = 0;
        else
        {
            offset_x = win->client_rect.left;
            offset_y = win->client_rect.top;
        }
        if (!clip_children( win, NULL, region, offset_x, offset_y )) goto error;
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    }

    /* clip siblings of ancestors */

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    if (is_desktop_window(win)) offset_x = offset_y = 0;
    else
    {
        offset_x = win->window_rect.left;
        offset_y = win->window_rect.top;
    }

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    if ((tmp = create_empty_region()) != NULL)
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    {
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        while (win->parent)
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        {
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            /* we don't clip out top-level siblings as that's up to the native windowing system */
            if ((win->style & WS_CLIPSIBLINGS) && !is_desktop_window( win->parent ))
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            {
                if (!clip_children( win->parent, win, region, 0, 0 )) goto error;
                if (is_region_empty( region )) break;
            }
            /* clip to parent client area */
            win = win->parent;
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            if (!is_desktop_window(win))
            {
                offset_x += win->client_rect.left;
                offset_y += win->client_rect.top;
                offset_region( region, win->client_rect.left, win->client_rect.top );
            }
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            set_region_client_rect( tmp, win );
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            if (win->win_region && !intersect_window_region( tmp, win )) goto error;
            if (!intersect_region( region, region, tmp )) goto error;
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            if (is_region_empty( region )) break;
        }
        free_region( tmp );
    }
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    offset_region( region, -offset_x, -offset_y );  /* make it relative to target window */
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    return region;

error:
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    if (tmp) free_region( tmp );
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    free_region( region );
    return NULL;
}


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/* get the window class of a window */
struct window_class* get_window_class( user_handle_t window )
{
    struct window *win;
    if (!(win = get_window( window ))) return NULL;
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    if (!win->class) set_error( STATUS_ACCESS_DENIED );
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    return win->class;
}

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/* determine the window visible rectangle, i.e. window or client rect cropped by parent rects */
/* the returned rectangle is in window coordinates; return 0 if rectangle is empty */
static int get_window_visible_rect( struct window *win, rectangle_t *rect, int frame )
{
    int offset_x = 0, offset_y = 0;

    if (!(win->style & WS_VISIBLE)) return 0;

    *rect = frame ? win->window_rect : win->client_rect;
    if (!is_desktop_window(win))
    {
        offset_x = win->window_rect.left;
        offset_y = win->window_rect.top;
    }

    while (win->parent)
    {
        win = win->parent;
        if (!(win->style & WS_VISIBLE) || win->style & WS_MINIMIZE) return 0;
        if (!is_desktop_window(win))
        {
            offset_x += win->client_rect.left;
            offset_y += win->client_rect.top;
            offset_rect( rect, win->client_rect.left, win->client_rect.top );
        }
        if (!intersect_rect( rect, rect, &win->client_rect )) return 0;
        if (!intersect_rect( rect, rect, &win->window_rect )) return 0;
    }
    offset_rect( rect, -offset_x, -offset_y );
    return 1;
}

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/* return a copy of the specified region cropped to the window client or frame rectangle, */
/* and converted from client to window coordinates. Helper for (in)validate_window. */
static struct region *crop_region_to_win_rect( struct window *win, struct region *region, int frame )
{
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    rectangle_t rect;
    struct region *tmp;
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    if (!get_window_visible_rect( win, &rect, frame )) return NULL;
    if (!(tmp = create_empty_region())) return NULL;
    set_region_rect( tmp, &rect );
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    if (region)
    {
        /* map it to client coords */
        offset_region( tmp, win->window_rect.left - win->client_rect.left,
                       win->window_rect.top - win->client_rect.top );
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        /* intersect specified region with bounding rect */
        if (!intersect_region( tmp, region, tmp )) goto done;
        if (is_region_empty( tmp )) goto done;
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        /* map it back to window coords */
        offset_region( tmp, win->client_rect.left - win->window_rect.left,
                       win->client_rect.top - win->window_rect.top );
    }
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    return tmp;

done:
    free_region( tmp );
    return NULL;
}


/* set a region as new update region for the window */
static void set_update_region( struct window *win, struct region *region )
{
    if (region && !is_region_empty( region ))
    {
        if (!win->update_region) inc_window_paint_count( win, 1 );
        else free_region( win->update_region );
        win->update_region = region;
    }
    else
    {
Rob Shearman's avatar
Rob Shearman committed
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        if (win->update_region)
        {
            inc_window_paint_count( win, -1 );
            free_region( win->update_region );
        }
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        win->paint_flags &= ~(PAINT_ERASE | PAINT_DELAYED_ERASE | PAINT_NONCLIENT);
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        win->update_region = NULL;
        if (region) free_region( region );
    }
}


/* add a region to the update region; the passed region is freed or reused */
static int add_update_region( struct window *win, struct region *region )
{
    if (win->update_region && !union_region( region, win->update_region, region ))
    {
        free_region( region );
        return 0;
    }
    set_update_region( win, region );
    return 1;
}


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/* crop the update region of children to the specified rectangle, in client coords */
static void crop_children_update_region( struct window *win, rectangle_t *rect )
{
    struct window *child;
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    struct region *tmp;
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    rectangle_t child_rect;

    LIST_FOR_EACH_ENTRY( child, &win->children, struct window, entry )
    {
        if (!(child->style & WS_VISIBLE)) continue;
        if (!rect)  /* crop everything out */
        {
            crop_children_update_region( child, NULL );
            set_update_region( child, NULL );
            continue;
        }

        /* nothing to do if child is completely inside rect */
        if (child->window_rect.left >= rect->left &&
            child->window_rect.top >= rect->top &&
            child->window_rect.right <= rect->right &&
            child->window_rect.bottom <= rect->bottom) continue;

        /* map to child client coords and crop grand-children */
        child_rect = *rect;
        offset_rect( &child_rect, -child->client_rect.left, -child->client_rect.top );
        crop_children_update_region( child, &child_rect );

        /* now crop the child itself */
        if (!child->update_region) continue;
        if (!(tmp = create_empty_region())) continue;
        set_region_rect( tmp, rect );
        offset_region( tmp, -child->window_rect.left, -child->window_rect.top );
        if (intersect_region( tmp, child->update_region, tmp )) set_update_region( child, tmp );
        else free_region( tmp );
    }
}


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/* validate the non client area of a window */
static void validate_non_client( struct window *win )
{
    struct region *tmp;
    rectangle_t rect;

    if (!win->update_region) return;  /* nothing to do */

    /* get client rect in window coords */
    rect.left   = win->client_rect.left - win->window_rect.left;
    rect.top    = win->client_rect.top - win->window_rect.top;
    rect.right  = win->client_rect.right - win->window_rect.left;
    rect.bottom = win->client_rect.bottom - win->window_rect.top;

1194
    if ((tmp = create_empty_region()))
1195
    {
1196
        set_region_rect( tmp, &rect );
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        if (intersect_region( tmp, win->update_region, tmp ))
            set_update_region( win, tmp );
        else
            free_region( tmp );
    }
    win->paint_flags &= ~PAINT_NONCLIENT;
}


/* validate a window completely so that we don't get any further paint messages for it */
static void validate_whole_window( struct window *win )
{
    set_update_region( win, NULL );

    if (win->paint_flags & PAINT_INTERNAL)
    {
        win->paint_flags &= ~PAINT_INTERNAL;
        inc_window_paint_count( win, -1 );
    }
}


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/* validate a window's children so that we don't get any further paint messages for it */
static void validate_children( struct window *win )
{
    struct window *child;

    LIST_FOR_EACH_ENTRY( child, &win->children, struct window, entry )
    {
        if (!(child->style & WS_VISIBLE)) continue;
        validate_children(child);
        validate_whole_window(child);
    }
}


1233
/* validate the update region of a window on all parents; helper for get_update_region */
1234 1235 1236 1237 1238 1239 1240 1241
static void validate_parents( struct window *child )
{
    int offset_x = 0, offset_y = 0;
    struct window *win = child;
    struct region *tmp = NULL;

    if (!child->update_region) return;

1242
    while (win->parent)
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
    {
        /* map to parent client coords */
        offset_x += win->window_rect.left;
        offset_y += win->window_rect.top;

        win = win->parent;

        /* and now map to window coords */
        offset_x += win->client_rect.left - win->window_rect.left;
        offset_y += win->client_rect.top - win->window_rect.top;

        if (win->update_region && !(win->style & WS_CLIPCHILDREN))
        {
            if (!tmp && !(tmp = create_empty_region())) return;
            offset_region( child->update_region, offset_x, offset_y );
            if (subtract_region( tmp, win->update_region, child->update_region ))
            {
                set_update_region( win, tmp );
                tmp = NULL;
            }
            /* restore child coords */
            offset_region( child->update_region, -offset_x, -offset_y );
        }
    }
    if (tmp) free_region( tmp );
}


/* add/subtract a region (in client coordinates) to the update region of the window */
static void redraw_window( struct window *win, struct region *region, int frame, unsigned int flags )
{
    struct region *tmp;
    struct window *child;

    if (flags & RDW_INVALIDATE)
    {
        if (!(tmp = crop_region_to_win_rect( win, region, frame ))) return;

        if (!add_update_region( win, tmp )) return;

        if (flags & RDW_FRAME) win->paint_flags |= PAINT_NONCLIENT;
        if (flags & RDW_ERASE) win->paint_flags |= PAINT_ERASE;
    }
    else if (flags & RDW_VALIDATE)
    {
        if (!region && (flags & RDW_NOFRAME))  /* shortcut: validate everything */
        {
            set_update_region( win, NULL );
        }
        else if (win->update_region)
        {
            if ((tmp = crop_region_to_win_rect( win, region, frame )))
            {
                if (!subtract_region( tmp, win->update_region, tmp ))
                {
                    free_region( tmp );
                    return;
                }
                set_update_region( win, tmp );
            }
            if (flags & RDW_NOFRAME) validate_non_client( win );
1304
            if (flags & RDW_NOERASE) win->paint_flags &= ~(PAINT_ERASE | PAINT_DELAYED_ERASE);
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
        }
    }

    if ((flags & RDW_INTERNALPAINT) && !(win->paint_flags & PAINT_INTERNAL))
    {
        win->paint_flags |= PAINT_INTERNAL;
        inc_window_paint_count( win, 1 );
    }
    else if ((flags & RDW_NOINTERNALPAINT) && (win->paint_flags & PAINT_INTERNAL))
    {
        win->paint_flags &= ~PAINT_INTERNAL;
        inc_window_paint_count( win, -1 );
    }

    /* now process children recursively */

    if (flags & RDW_NOCHILDREN) return;
    if (win->style & WS_MINIMIZE) return;
    if ((win->style & WS_CLIPCHILDREN) && !(flags & RDW_ALLCHILDREN)) return;

    if (!(tmp = crop_region_to_win_rect( win, region, 0 ))) return;

    /* map to client coordinates */
    offset_region( tmp, win->window_rect.left - win->client_rect.left,
                   win->window_rect.top - win->client_rect.top );

    if (flags & RDW_INVALIDATE) flags |= RDW_FRAME | RDW_ERASE;

1333
    LIST_FOR_EACH_ENTRY( child, &win->children, struct window, entry )
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
    {
        if (!(child->style & WS_VISIBLE)) continue;
        if (!rect_in_region( tmp, &child->window_rect )) continue;
        offset_region( tmp, -child->client_rect.left, -child->client_rect.top );
        redraw_window( child, tmp, 1, flags );
        offset_region( tmp, child->client_rect.left, child->client_rect.top );
    }
    free_region( tmp );
}


/* retrieve the update flags for a window depending on the state of the update region */
static unsigned int get_update_flags( struct window *win, unsigned int flags )
{
    unsigned int ret = 0;

    if (flags & UPDATE_NONCLIENT)
    {
        if ((win->paint_flags & PAINT_NONCLIENT) && win->update_region) ret |= UPDATE_NONCLIENT;
    }
    if (flags & UPDATE_ERASE)
    {
        if ((win->paint_flags & PAINT_ERASE) && win->update_region) ret |= UPDATE_ERASE;
    }
    if (flags & UPDATE_PAINT)
    {
1360 1361 1362 1363 1364
        if (win->update_region)
        {
            if (win->paint_flags & PAINT_DELAYED_ERASE) ret |= UPDATE_DELAYED_ERASE;
            ret |= UPDATE_PAINT;
        }
1365 1366 1367
    }
    if (flags & UPDATE_INTERNALPAINT)
    {
1368 1369 1370 1371 1372
        if (win->paint_flags & PAINT_INTERNAL)
        {
            ret |= UPDATE_INTERNALPAINT;
            if (win->paint_flags & PAINT_DELAYED_ERASE) ret |= UPDATE_DELAYED_ERASE;
        }
1373 1374 1375 1376 1377 1378
    }
    return ret;
}


/* iterate through the children of the given window until we find one with some update flags */
1379 1380
static unsigned int get_child_update_flags( struct window *win, struct window *from_child,
                                            unsigned int flags, struct window **child )
1381 1382 1383 1384
{
    struct window *ptr;
    unsigned int ret = 0;

1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
    /* first make sure we want to iterate children at all */

    if (win->style & WS_MINIMIZE) return 0;

    /* note: the WS_CLIPCHILDREN test is the opposite of the invalidation case,
     * here we only want to repaint children of windows that clip them, others
     * need to wait for WM_PAINT to be done in the parent first.
     */
    if (!(flags & UPDATE_ALLCHILDREN) && !(win->style & WS_CLIPCHILDREN)) return 0;

1395
    LIST_FOR_EACH_ENTRY( ptr, &win->children, struct window, entry )
1396
    {
1397 1398 1399 1400 1401
        if (from_child)  /* skip all children until from_child is found */
        {
            if (ptr == from_child) from_child = NULL;
            continue;
        }
1402 1403 1404 1405 1406 1407
        if (!(ptr->style & WS_VISIBLE)) continue;
        if ((ret = get_update_flags( ptr, flags )) != 0)
        {
            *child = ptr;
            break;
        }
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
        if ((ret = get_child_update_flags( ptr, NULL, flags, child ))) break;
    }
    return ret;
}

/* iterate through children and siblings of the given window until we find one with some update flags */
static unsigned int get_window_update_flags( struct window *win, struct window *from_child,
                                             unsigned int flags, struct window **child )
{
    unsigned int ret;
    struct window *ptr, *from_sibling = NULL;

    /* if some parent is not visible start from the next sibling */

    if (!is_visible( win )) return 0;
1423
    for (ptr = from_child; ptr; ptr = ptr->parent)
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433
    {
        if (!(ptr->style & WS_VISIBLE) || (ptr->style & WS_MINIMIZE)) from_sibling = ptr;
        if (ptr == win) break;
    }

    /* non-client painting must be delayed if one of the parents is going to
     * be repainted and doesn't clip children */

    if ((flags & UPDATE_NONCLIENT) && !(flags & (UPDATE_PAINT|UPDATE_INTERNALPAINT)))
    {
1434
        for (ptr = win->parent; ptr; ptr = ptr->parent)
1435
        {
1436 1437 1438 1439 1440
            if (!(ptr->style & WS_CLIPCHILDREN) && win_needs_repaint( ptr ))
                return 0;
        }
        if (from_child && !(flags & UPDATE_ALLCHILDREN))
        {
1441
            for (ptr = from_sibling ? from_sibling : from_child; ptr; ptr = ptr->parent)
1442 1443 1444 1445
            {
                if (!(ptr->style & WS_CLIPCHILDREN) && win_needs_repaint( ptr )) from_sibling = ptr;
                if (ptr == win) break;
            }
1446
        }
1447
    }
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479


    /* check window itself (only if not restarting from a child) */

    if (!from_child)
    {
        if ((ret = get_update_flags( win, flags )))
        {
            *child = win;
            return ret;
        }
        from_child = win;
    }

    /* now check children */

    if (flags & UPDATE_NOCHILDREN) return 0;
    if (!from_sibling)
    {
        if ((ret = get_child_update_flags( from_child, NULL, flags, child ))) return ret;
        from_sibling = from_child;
    }

    /* then check siblings and parent siblings */

    while (from_sibling->parent && from_sibling != win)
    {
        if ((ret = get_child_update_flags( from_sibling->parent, from_sibling, flags, child )))
            return ret;
        from_sibling = from_sibling->parent;
    }
    return 0;
1480 1481 1482
}


1483 1484 1485 1486
/* expose the areas revealed by a vis region change on the window parent */
/* returns the region exposed on the window itself (in client coordinates) */
static struct region *expose_window( struct window *win, const rectangle_t *old_window_rect,
                                     struct region *old_vis_rgn )
1487
{
1488
    struct region *new_vis_rgn, *exposed_rgn;
1489

1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
    if (!(new_vis_rgn = get_visible_region( win, DCX_WINDOW ))) return NULL;

    if ((exposed_rgn = create_empty_region()))
    {
        if (subtract_region( exposed_rgn, new_vis_rgn, old_vis_rgn ) && !is_region_empty( exposed_rgn ))
        {
            /* make it relative to the new client area */
            offset_region( exposed_rgn, win->window_rect.left - win->client_rect.left,
                           win->window_rect.top - win->client_rect.top );
        }
        else
        {
            free_region( exposed_rgn );
            exposed_rgn = NULL;
        }
    }

1507
    if (win->parent)
1508
    {
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
        /* make it relative to the old window pos for subtracting */
        offset_region( new_vis_rgn, win->window_rect.left - old_window_rect->left,
                       win->window_rect.top - old_window_rect->top  );

        if ((win->parent->style & WS_CLIPCHILDREN) ?
            subtract_region( new_vis_rgn, old_vis_rgn, new_vis_rgn ) :
            xor_region( new_vis_rgn, old_vis_rgn, new_vis_rgn ))
        {
            if (!is_region_empty( new_vis_rgn ))
            {
1519 1520
                /* make it relative to parent */
                offset_region( new_vis_rgn, old_window_rect->left, old_window_rect->top );
1521 1522 1523
                redraw_window( win->parent, new_vis_rgn, 0, RDW_INVALIDATE | RDW_ERASE | RDW_ALLCHILDREN );
            }
        }
1524
    }
1525 1526
    free_region( new_vis_rgn );
    return exposed_rgn;
1527 1528 1529 1530
}


/* set the window and client rectangles, updating the update region if necessary */
1531
static void set_window_pos( struct window *win, struct window *previous,
1532
                            unsigned int swp_flags, const rectangle_t *window_rect,
1533 1534
                            const rectangle_t *client_rect, const rectangle_t *visible_rect,
                            const rectangle_t *valid_rects )
1535
{
1536
    struct region *old_vis_rgn = NULL, *exposed_rgn = NULL;
1537
    const rectangle_t old_window_rect = win->window_rect;
1538
    const rectangle_t old_visible_rect = win->visible_rect;
1539
    const rectangle_t old_client_rect = win->client_rect;
1540
    rectangle_t rect;
1541
    int client_changed, frame_changed;
1542
    int visible = (win->style & WS_VISIBLE) || (swp_flags & SWP_SHOWWINDOW);
1543

1544
    if (win->parent && !is_visible( win->parent )) visible = 0;
1545

1546
    if (visible && !(old_vis_rgn = get_visible_region( win, DCX_WINDOW ))) return;
1547 1548 1549

    /* set the new window info before invalidating anything */

1550
    win->window_rect  = *window_rect;
1551
    win->visible_rect = *visible_rect;
1552
    win->client_rect  = *client_rect;
1553
    if (!(swp_flags & SWP_NOZORDER) && win->parent) link_window( win, previous );
1554 1555 1556
    if (swp_flags & SWP_SHOWWINDOW) win->style |= WS_VISIBLE;
    else if (swp_flags & SWP_HIDEWINDOW) win->style &= ~WS_VISIBLE;

1557 1558 1559
    /* if the window is not visible, everything is easy */
    if (!visible) return;

1560 1561
    /* expose anything revealed by the change */

1562
    if (!(swp_flags & SWP_NOREDRAW))
1563
        exposed_rgn = expose_window( win, &old_window_rect, old_vis_rgn );
1564 1565 1566 1567 1568

    if (!(win->style & WS_VISIBLE))
    {
        /* clear the update region since the window is no longer visible */
        validate_whole_window( win );
1569
        validate_children( win );
1570 1571 1572
        goto done;
    }

1573 1574
    /* crop update region to the new window rect */

1575
    if (win->update_region)
1576
    {
1577
        if (get_window_visible_rect( win, &rect, 1 ))
1578
        {
1579 1580 1581 1582 1583 1584 1585 1586 1587
            struct region *tmp = create_empty_region();
            if (tmp)
            {
                set_region_rect( tmp, &rect );
                if (intersect_region( tmp, win->update_region, tmp ))
                    set_update_region( win, tmp );
                else
                    free_region( tmp );
            }
1588
        }
1589
        else set_update_region( win, NULL ); /* visible rect is empty */
1590 1591
    }

1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
    /* crop children regions to the new window rect */

    if (get_window_visible_rect( win, &rect, 0 ))
    {
        /* map to client coords */
        offset_rect( &rect, win->window_rect.left - win->client_rect.left,
                     win->window_rect.top - win->client_rect.top );
        crop_children_update_region( win, &rect );
    }
    else crop_children_update_region( win, NULL );

1603 1604
    if (swp_flags & SWP_NOREDRAW) goto done;  /* do not repaint anything */

1605 1606
    /* expose the whole non-client area if it changed in any way */

1607 1608 1609
    if (swp_flags & SWP_NOCOPYBITS)
    {
        frame_changed = ((swp_flags & SWP_FRAMECHANGED) ||
1610 1611
                         memcmp( window_rect, &old_window_rect, sizeof(old_window_rect) ) ||
                         memcmp( visible_rect, &old_visible_rect, sizeof(old_visible_rect) ));
1612 1613 1614 1615 1616 1617 1618 1619 1620
        client_changed = memcmp( client_rect, &old_client_rect, sizeof(old_client_rect) );
    }
    else
    {
        /* assume the bits have been moved to follow the window rect */
        int x_offset = window_rect->left - old_window_rect.left;
        int y_offset = window_rect->top - old_window_rect.top;
        frame_changed = ((swp_flags & SWP_FRAMECHANGED) ||
                         window_rect->right  - old_window_rect.right != x_offset ||
1621 1622 1623 1624 1625
                         window_rect->bottom - old_window_rect.bottom != y_offset ||
                         visible_rect->left   - old_visible_rect.left   != x_offset ||
                         visible_rect->right  - old_visible_rect.right  != x_offset ||
                         visible_rect->top    - old_visible_rect.top    != y_offset ||
                         visible_rect->bottom - old_visible_rect.bottom != y_offset);
1626 1627 1628
        client_changed = (client_rect->left   - old_client_rect.left   != x_offset ||
                          client_rect->right  - old_client_rect.right  != x_offset ||
                          client_rect->top    - old_client_rect.top    != y_offset ||
1629 1630 1631
                          client_rect->bottom - old_client_rect.bottom != y_offset ||
                          !valid_rects ||
                          memcmp( &valid_rects[0], client_rect, sizeof(*client_rect) ));
1632 1633 1634
    }

    if (frame_changed || client_changed)
1635
    {
1636
        struct region *win_rgn = old_vis_rgn;  /* reuse previous region */
1637

1638 1639
        set_region_rect( win_rgn, window_rect );
        if (valid_rects)
1640
        {
1641
            /* subtract the valid portion of client rect from the total region */
1642 1643
            struct region *tmp = create_empty_region();
            if (tmp)
1644
            {
1645 1646 1647
                set_region_rect( tmp, &valid_rects[0] );
                if (subtract_region( tmp, win_rgn, tmp )) win_rgn = tmp;
                else free_region( tmp );
1648 1649
            }
        }
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
        if (!is_desktop_window(win))
            offset_region( win_rgn, -client_rect->left, -client_rect->top );
        if (exposed_rgn)
        {
            union_region( exposed_rgn, exposed_rgn, win_rgn );
            if (win_rgn != old_vis_rgn) free_region( win_rgn );
        }
        else
        {
            exposed_rgn = win_rgn;
            if (win_rgn == old_vis_rgn) old_vis_rgn = NULL;
        }
1662 1663
    }

1664 1665 1666
    if (exposed_rgn)
        redraw_window( win, exposed_rgn, 1, RDW_INVALIDATE | RDW_ERASE | RDW_FRAME | RDW_ALLCHILDREN );

1667
done:
1668
    if (old_vis_rgn) free_region( old_vis_rgn );
1669
    if (exposed_rgn) free_region( exposed_rgn );
1670 1671 1672
    clear_error();  /* we ignore out of memory errors once the new rects have been set */
}

1673

1674 1675 1676
/* set the window region, updating the update region if necessary */
static void set_window_region( struct window *win, struct region *region, int redraw )
{
1677
    struct region *old_vis_rgn = NULL, *exposed_rgn;
1678 1679 1680 1681

    /* no need to redraw if window is not visible */
    if (redraw && !is_visible( win )) redraw = 0;

1682
    if (redraw) old_vis_rgn = get_visible_region( win, DCX_WINDOW );
1683 1684 1685 1686

    if (win->win_region) free_region( win->win_region );
    win->win_region = region;

1687 1688
    /* expose anything revealed by the change */
    if (old_vis_rgn && ((exposed_rgn = expose_window( win, &win->window_rect, old_vis_rgn ))))
1689
    {
1690 1691
        redraw_window( win, exposed_rgn, 1, RDW_INVALIDATE | RDW_ERASE | RDW_FRAME | RDW_ALLCHILDREN );
        free_region( exposed_rgn );
1692 1693 1694 1695 1696 1697 1698
    }

    if (old_vis_rgn) free_region( old_vis_rgn );
    clear_error();  /* we ignore out of memory errors since the region has been set */
}


1699 1700
/* create a window */
DECL_HANDLER(create_window)
1701
{
1702
    struct window *win, *parent = NULL, *owner = NULL;
1703
    struct unicode_str cls_name;
1704
    atom_t atom;
1705

1706
    reply->handle = 0;
1707
    if (req->parent && !(parent = get_window( req->parent ))) return;
1708

1709 1710 1711 1712
    if (req->owner)
    {
        if (!(owner = get_window( req->owner ))) return;
        if (is_desktop_window(owner)) owner = NULL;
1713
        else if (parent && !is_desktop_window(parent))
1714
        {
1715
            /* an owned window must be created as top-level */
1716 1717 1718
            set_error( STATUS_ACCESS_DENIED );
            return;
        }
1719 1720
        else /* owner must be a top-level window */
            while (!is_desktop_window(owner->parent)) owner = owner->parent;
1721
    }
1722

1723 1724
    get_req_unicode_str( &cls_name );
    atom = cls_name.len ? find_global_atom( NULL, &cls_name ) : req->atom;
1725 1726

    if (!(win = create_window( parent, owner, atom, req->instance ))) return;
1727

1728
    reply->handle    = win->handle;
1729 1730
    reply->parent    = win->parent ? win->parent->handle : 0;
    reply->owner     = win->owner;
1731 1732
    reply->extra     = win->nb_extra_bytes;
    reply->class_ptr = get_class_client_ptr( win->class );
1733 1734 1735
}


1736 1737
/* set the parent of a window */
DECL_HANDLER(set_parent)
1738
{
1739
    struct window *win, *parent = NULL;
1740

1741 1742
    if (!(win = get_window( req->handle ))) return;
    if (req->parent && !(parent = get_window( req->parent ))) return;
1743

1744
    if (is_desktop_window(win))
1745 1746 1747 1748
    {
        set_error( STATUS_INVALID_PARAMETER );
        return;
    }
1749
    reply->old_parent  = win->parent->handle;
1750
    reply->full_parent = parent ? parent->handle : 0;
1751
    set_parent_window( win, parent );
1752 1753 1754 1755 1756 1757
}


/* destroy a window */
DECL_HANDLER(destroy_window)
{
1758
    struct window *win = get_window( req->handle );
1759 1760
    if (win)
    {
1761
        if (!is_desktop_window(win)) destroy_window( win );
1762
        else if (win->thread == current) detach_window_thread( win );
1763 1764 1765 1766 1767
        else set_error( STATUS_ACCESS_DENIED );
    }
}


1768 1769 1770
/* retrieve the desktop window for the current thread */
DECL_HANDLER(get_desktop_window)
{
1771
    struct desktop *desktop = get_thread_desktop( current, 0 );
1772

1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798
    if (!desktop) return;

    if (!desktop->top_window && req->force)  /* create it */
    {
        if ((desktop->top_window = create_window( NULL, NULL, DESKTOP_ATOM, 0 )))
        {
            detach_window_thread( desktop->top_window );
            desktop->top_window->style  = WS_POPUP | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
        }
    }

    if (!desktop->msg_window && req->force)  /* create it */
    {
        static const WCHAR messageW[] = {'M','e','s','s','a','g','e'};
        static const struct unicode_str name = { messageW, sizeof(messageW) };
        atom_t atom = add_global_atom( NULL, &name );
        if (atom && (desktop->msg_window = create_window( NULL, NULL, atom, 0 )))
        {
            detach_window_thread( desktop->msg_window );
            desktop->msg_window->style = WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
        }
    }

    reply->top_window = desktop->top_window ? desktop->top_window->handle : 0;
    reply->msg_window = desktop->msg_window ? desktop->msg_window->handle : 0;
    release_object( desktop );
1799 1800 1801
}


1802 1803 1804 1805
/* set a window owner */
DECL_HANDLER(set_window_owner)
{
    struct window *win = get_window( req->handle );
1806
    struct window *owner = NULL;
1807

1808 1809
    if (!win) return;
    if (req->owner && !(owner = get_window( req->owner ))) return;
1810
    if (is_desktop_window(win))
1811 1812 1813 1814
    {
        set_error( STATUS_ACCESS_DENIED );
        return;
    }
1815 1816
    reply->prev_owner = win->owner;
    reply->full_owner = win->owner = owner ? owner->handle : 0;
1817 1818 1819
}


1820
/* get information from a window handle */
1821 1822
DECL_HANDLER(get_window_info)
{
1823
    struct window *win = get_window( req->handle );
1824

1825 1826
    reply->full_handle = 0;
    reply->tid = reply->pid = 0;
1827 1828
    if (win)
    {
1829
        reply->full_handle = win->handle;
1830
        reply->last_active = win->handle;
1831
        reply->is_unicode  = win->is_unicode;
1832
        if (get_user_object( win->last_active, USER_WINDOW )) reply->last_active = win->last_active;
1833 1834
        if (win->thread)
        {
1835 1836
            reply->tid  = get_thread_id( win->thread );
            reply->pid  = get_process_id( win->thread->process );
1837
            reply->atom = win->class ? get_class_atom( win->class ) : DESKTOP_ATOM;
1838 1839 1840
        }
    }
}
1841 1842


1843 1844 1845 1846
/* set some information in a window */
DECL_HANDLER(set_window_info)
{
    struct window *win = get_window( req->handle );
1847

1848
    if (!win) return;
1849
    if (req->flags && is_desktop_window(win) && win->thread != current)
1850 1851 1852 1853
    {
        set_error( STATUS_ACCESS_DENIED );
        return;
    }
1854 1855 1856
    if (req->extra_size > sizeof(req->extra_value) ||
        req->extra_offset < -1 ||
        req->extra_offset > win->nb_extra_bytes - (int)req->extra_size)
1857
    {
1858
        set_win32_error( ERROR_INVALID_INDEX );
1859 1860 1861 1862
        return;
    }
    if (req->extra_offset != -1)
    {
1863
        memcpy( &reply->old_extra_value, win->extra_bytes + req->extra_offset, req->extra_size );
1864
    }
1865
    else if (req->flags & SET_WIN_EXTRA)
1866
    {
1867
        set_win32_error( ERROR_INVALID_INDEX );
1868 1869
        return;
    }
1870 1871 1872 1873 1874
    reply->old_style     = win->style;
    reply->old_ex_style  = win->ex_style;
    reply->old_id        = win->id;
    reply->old_instance  = win->instance;
    reply->old_user_data = win->user_data;
1875
    if (req->flags & SET_WIN_STYLE) win->style = req->style;
1876 1877 1878 1879 1880
    if (req->flags & SET_WIN_EXSTYLE)
    {
        /* WS_EX_TOPMOST can only be changed for unlinked windows */
        if (!win->is_linked) win->ex_style = req->ex_style;
        else win->ex_style = (req->ex_style & ~WS_EX_TOPMOST) | (win->ex_style & WS_EX_TOPMOST);
1881
        if (!(win->ex_style & WS_EX_LAYERED)) win->is_layered = 0;
1882
    }
1883 1884
    if (req->flags & SET_WIN_ID) win->id = req->id;
    if (req->flags & SET_WIN_INSTANCE) win->instance = req->instance;
1885
    if (req->flags & SET_WIN_UNICODE) win->is_unicode = req->is_unicode;
1886
    if (req->flags & SET_WIN_USERDATA) win->user_data = req->user_data;
1887 1888
    if (req->flags & SET_WIN_EXTRA) memcpy( win->extra_bytes + req->extra_offset,
                                            &req->extra_value, req->extra_size );
1889 1890 1891

    /* changing window style triggers a non-client paint */
    if (req->flags & SET_WIN_STYLE) win->paint_flags |= PAINT_NONCLIENT;
1892 1893 1894
}


1895 1896 1897 1898 1899
/* get a list of the window parents, up to the root of the tree */
DECL_HANDLER(get_window_parents)
{
    struct window *ptr, *win = get_window( req->handle );
    int total = 0;
1900
    user_handle_t *data;
1901
    data_size_t len;
1902 1903 1904

    if (win) for (ptr = win->parent; ptr; ptr = ptr->parent) total++;

1905 1906 1907
    reply->count = total;
    len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
    if (len && ((data = set_reply_data_size( len ))))
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917
    {
        for (ptr = win->parent; ptr && len; ptr = ptr->parent, len -= sizeof(*data))
            *data++ = ptr->handle;
    }
}


/* get a list of the window children */
DECL_HANDLER(get_window_children)
{
1918 1919
    struct window *parent = NULL;
    unsigned int total;
1920
    user_handle_t *data;
1921
    data_size_t len;
1922
    struct unicode_str cls_name;
1923
    atom_t atom = req->atom;
1924
    struct desktop *desktop = NULL;
1925

1926 1927 1928
    get_req_unicode_str( &cls_name );
    if (cls_name.len && !(atom = find_global_atom( NULL, &cls_name ))) return;

1929 1930
    if (req->desktop)
    {
1931
        if (!(desktop = get_desktop_obj( current->process, req->desktop, DESKTOP_ENUMERATE ))) return;
1932 1933
        parent = desktop->top_window;
    }
1934 1935 1936 1937 1938
    else
    {
        if (req->parent && !(parent = get_window( req->parent ))) return;
        if (!parent && !(desktop = get_thread_desktop( current, 0 ))) return;
    }
1939

1940 1941 1942 1943 1944 1945
    if (parent)
        total = get_children_windows( parent, atom, req->tid, NULL, 0 );
    else
        total = get_children_windows( desktop->top_window, atom, req->tid, NULL, 0 ) +
                get_children_windows( desktop->msg_window, atom, req->tid, NULL, 0 );

1946 1947 1948
    reply->count = total;
    len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
    if (len && ((data = set_reply_data_size( len ))))
1949
    {
1950 1951
        if (parent) get_children_windows( parent, atom, req->tid, data, len / sizeof(user_handle_t) );
        else
1952
        {
1953 1954 1955 1956 1957 1958 1959
            total = get_children_windows( desktop->top_window, atom, req->tid,
                                          data, len / sizeof(user_handle_t) );
            data += total;
            len -= total * sizeof(user_handle_t);
            if (len >= sizeof(user_handle_t))
                get_children_windows( desktop->msg_window, atom, req->tid,
                                      data, len / sizeof(user_handle_t) );
1960
        }
1961
    }
1962
    if (desktop) release_object( desktop );
1963 1964 1965
}


1966 1967 1968 1969 1970
/* get a list of the window children that contain a given point */
DECL_HANDLER(get_window_children_from_point)
{
    struct user_handle_array array;
    struct window *parent = get_window( req->parent );
1971
    data_size_t len;
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986

    if (!parent) return;

    array.handles = NULL;
    array.count = 0;
    array.total = 0;
    if (!all_windows_from_point( parent, req->x, req->y, &array )) return;

    reply->count = array.count;
    len = min( get_reply_max_size(), array.count * sizeof(user_handle_t) );
    if (len) set_reply_data_ptr( array.handles, len );
    else free( array.handles );
}


1987 1988 1989
/* get window tree information from a window handle */
DECL_HANDLER(get_window_tree)
{
1990
    struct window *ptr, *win = get_window( req->handle );
1991 1992 1993

    if (!win) return;

1994 1995 1996 1997 1998 1999 2000 2001 2002
    reply->parent        = 0;
    reply->owner         = 0;
    reply->next_sibling  = 0;
    reply->prev_sibling  = 0;
    reply->first_sibling = 0;
    reply->last_sibling  = 0;
    reply->first_child   = 0;
    reply->last_child    = 0;

2003 2004 2005
    if (win->parent)
    {
        struct window *parent = win->parent;
2006 2007
        reply->parent = parent->handle;
        reply->owner  = win->owner;
2008 2009 2010 2011 2012
        if (win->is_linked)
        {
            if ((ptr = get_next_window( win ))) reply->next_sibling = ptr->handle;
            if ((ptr = get_prev_window( win ))) reply->prev_sibling = ptr->handle;
        }
2013 2014 2015 2016 2017
        if ((ptr = get_first_child( parent ))) reply->first_sibling = ptr->handle;
        if ((ptr = get_last_child( parent ))) reply->last_sibling = ptr->handle;
    }
    if ((ptr = get_first_child( win ))) reply->first_child = ptr->handle;
    if ((ptr = get_last_child( win ))) reply->last_child = ptr->handle;
2018
}
2019 2020


2021 2022
/* set the position and Z order of a window */
DECL_HANDLER(set_window_pos)
2023
{
2024
    const rectangle_t *visible_rect = NULL, *valid_rects = NULL;
2025
    struct window *previous = NULL;
2026
    struct window *win = get_window( req->handle );
2027
    unsigned int flags = req->flags;
2028

2029 2030 2031 2032 2033
    if (!win) return;
    if (!win->parent) flags |= SWP_NOZORDER;  /* no Z order for the desktop */

    if (!(flags & SWP_NOZORDER))
    {
2034
        switch ((int)(unsigned long)req->previous)
2035
        {
2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
        case 0:   /* HWND_TOP */
            previous = WINPTR_TOP;
            break;
        case 1:   /* HWND_BOTTOM */
            previous = WINPTR_BOTTOM;
            break;
        case -1:  /* HWND_TOPMOST */
            previous = WINPTR_TOPMOST;
            break;
        case -2:  /* HWND_NOTOPMOST */
            previous = WINPTR_NOTOPMOST;
            break;
        default:
2049 2050 2051 2052 2053 2054 2055
            if (!(previous = get_window( req->previous ))) return;
            /* previous must be a sibling */
            if (previous->parent != win->parent)
            {
                set_error( STATUS_INVALID_PARAMETER );
                return;
            }
2056
            break;
2057 2058 2059 2060
        }
        if (previous == win) flags |= SWP_NOZORDER;  /* nothing to do */
    }

2061 2062
    /* window rectangle must be ordered properly */
    if (req->window.right < req->window.left || req->window.bottom < req->window.top)
2063 2064 2065 2066 2067
    {
        set_error( STATUS_INVALID_PARAMETER );
        return;
    }

2068 2069 2070 2071 2072
    if (get_req_data_size() >= sizeof(rectangle_t)) visible_rect = get_req_data();
    if (get_req_data_size() >= 3 * sizeof(rectangle_t)) valid_rects = visible_rect + 1;

    if (!visible_rect) visible_rect = &req->window;
    set_window_pos( win, previous, flags, &req->window, &req->client, visible_rect, valid_rects );
2073
    reply->new_style = win->style;
2074
    reply->new_ex_style = win->ex_style;
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084
}


/* get the window and client rectangles of a window */
DECL_HANDLER(get_window_rectangles)
{
    struct window *win = get_window( req->handle );

    if (win)
    {
2085 2086 2087
        reply->window  = win->window_rect;
        reply->visible = win->visible_rect;
        reply->client  = win->client_rect;
2088 2089 2090 2091
    }
}


2092 2093 2094 2095 2096 2097 2098
/* get the window text */
DECL_HANDLER(get_window_text)
{
    struct window *win = get_window( req->handle );

    if (win && win->text)
    {
2099
        data_size_t len = strlenW( win->text ) * sizeof(WCHAR);
2100 2101
        if (len > get_reply_max_size()) len = get_reply_max_size();
        set_reply_data( win->text, len );
2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113
    }
}


/* set the window text */
DECL_HANDLER(set_window_text)
{
    struct window *win = get_window( req->handle );

    if (win)
    {
        WCHAR *text = NULL;
2114
        data_size_t len = get_req_data_size() / sizeof(WCHAR);
2115 2116 2117
        if (len)
        {
            if (!(text = mem_alloc( (len+1) * sizeof(WCHAR) ))) return;
2118
            memcpy( text, get_req_data(), len * sizeof(WCHAR) );
2119 2120
            text[len] = 0;
        }
2121
        free( win->text );
2122 2123 2124 2125 2126
        win->text = text;
    }
}


2127 2128 2129 2130 2131
/* get the coordinates offset between two windows */
DECL_HANDLER(get_windows_offset)
{
    struct window *win;

2132
    reply->x = reply->y = 0;
2133 2134 2135
    if (req->from)
    {
        if (!(win = get_window( req->from ))) return;
2136
        while (win && !is_desktop_window(win))
2137
        {
2138 2139
            reply->x += win->client_rect.left;
            reply->y += win->client_rect.top;
2140 2141 2142 2143 2144 2145
            win = win->parent;
        }
    }
    if (req->to)
    {
        if (!(win = get_window( req->to ))) return;
2146
        while (win && !is_desktop_window(win))
2147
        {
2148 2149
            reply->x -= win->client_rect.left;
            reply->y -= win->client_rect.top;
2150 2151 2152 2153 2154 2155
            win = win->parent;
        }
    }
}


2156 2157 2158 2159
/* get the visible region of a window */
DECL_HANDLER(get_visible_region)
{
    struct region *region;
2160
    struct window *top, *win = get_window( req->window );
2161 2162 2163

    if (!win) return;

2164
    top = get_top_clipping_window( win );
2165
    if ((region = get_visible_region( win, req->flags )))
2166
    {
2167 2168 2169
        rectangle_t *data;
        map_win_region_to_screen( win, region );
        data = get_region_data_and_free( region, get_reply_max_size(), &reply->total_size );
2170
        if (data) set_reply_data_ptr( data, reply->total_size );
2171
    }
2172
    reply->top_win  = top->handle;
2173
    reply->top_rect = (top == win && (req->flags & DCX_WINDOW)) ? top->visible_rect : top->client_rect;
2174

2175 2176 2177 2178 2179 2180 2181
    if (!is_desktop_window(win))
    {
        reply->win_rect = (req->flags & DCX_WINDOW) ? win->window_rect : win->client_rect;
        client_to_screen_rect( top->parent, &reply->top_rect );
        client_to_screen_rect( win->parent, &reply->win_rect );
    }
    else
2182
    {
2183 2184 2185 2186
        reply->win_rect.left   = 0;
        reply->win_rect.top    = 0;
        reply->win_rect.right  = win->client_rect.right - win->client_rect.left;
        reply->win_rect.bottom = win->client_rect.bottom - win->client_rect.top;
2187
    }
2188 2189 2190
}


2191 2192 2193 2194 2195 2196 2197 2198 2199
/* get the window region */
DECL_HANDLER(get_window_region)
{
    struct window *win = get_window( req->window );

    if (!win) return;

    if (win->win_region)
    {
2200 2201
        rectangle_t *data = get_region_data( win->win_region, get_reply_max_size(), &reply->total_size );
        if (data) set_reply_data_ptr( data, reply->total_size );
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
    }
}


/* set the window region */
DECL_HANDLER(set_window_region)
{
    struct region *region = NULL;
    struct window *win = get_window( req->window );

    if (!win) return;

    if (get_req_data_size())  /* no data means remove the region completely */
    {
        if (!(region = create_region_from_req_data( get_req_data(), get_req_data_size() )))
            return;
    }
2219
    set_window_region( win, region, req->redraw );
2220 2221 2222
}


2223 2224 2225 2226 2227
/* get a window update region */
DECL_HANDLER(get_update_region)
{
    rectangle_t *data;
    unsigned int flags = req->flags;
2228
    struct window *from_child = NULL;
2229 2230 2231
    struct window *win = get_window( req->window );

    reply->flags = 0;
2232
    if (!win) return;
2233

2234
    if (req->from_child)
2235 2236 2237
    {
        struct window *ptr;

2238
        if (!(from_child = get_window( req->from_child ))) return;
2239

2240 2241 2242 2243
        /* make sure from_child is a child of win */
        ptr = from_child;
        while (ptr && ptr != win) ptr = ptr->parent;
        if (!ptr)
2244
        {
2245 2246
            set_error( STATUS_INVALID_PARAMETER );
            return;
2247 2248 2249
        }
    }

2250 2251 2252 2253 2254 2255
    if (flags & UPDATE_DELAYED_ERASE)  /* this means that the previous call didn't erase */
    {
        if (from_child) from_child->paint_flags |= PAINT_DELAYED_ERASE;
        else win->paint_flags |= PAINT_DELAYED_ERASE;
    }

2256
    reply->flags = get_window_update_flags( win, from_child, flags, &win );
2257 2258 2259 2260 2261 2262
    reply->child = win->handle;

    if (flags & UPDATE_NOREGION) return;

    if (win->update_region)
    {
2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274
        /* convert update region to screen coordinates */
        struct region *region = create_empty_region();

        if (!region) return;
        if (!copy_region( region, win->update_region ))
        {
            free_region( region );
            return;
        }
        map_win_region_to_screen( win, region );
        if (!(data = get_region_data_and_free( region, get_reply_max_size(),
                                               &reply->total_size ))) return;
2275 2276 2277 2278 2279
        set_reply_data_ptr( data, reply->total_size );
    }

    if (reply->flags & (UPDATE_PAINT|UPDATE_INTERNALPAINT)) /* validate everything */
    {
2280
        validate_parents( win );
2281 2282 2283 2284 2285
        validate_whole_window( win );
    }
    else
    {
        if (reply->flags & UPDATE_NONCLIENT) validate_non_client( win );
2286 2287
        if (reply->flags & UPDATE_ERASE)
        {
2288
            win->paint_flags &= ~(PAINT_ERASE | PAINT_DELAYED_ERASE);
2289
            /* desktop window only gets erased, not repainted */
2290
            if (is_desktop_window(win)) validate_whole_window( win );
2291
        }
2292 2293 2294 2295
    }
}


2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
/* update the z order of a window so that a given rectangle is fully visible */
DECL_HANDLER(update_window_zorder)
{
    rectangle_t tmp;
    struct window *ptr, *win = get_window( req->window );

    if (!win || !win->parent || !is_visible( win )) return;  /* nothing to do */

    LIST_FOR_EACH_ENTRY( ptr, &win->parent->children, struct window, entry )
    {
        if (ptr == win) break;
        if (!(ptr->style & WS_VISIBLE)) continue;
        if (ptr->ex_style & WS_EX_TRANSPARENT) continue;
        if (!intersect_rect( &tmp, &ptr->visible_rect, &req->rect )) continue;
        if (ptr->win_region && !rect_in_region( ptr->win_region, &req->rect )) continue;
        /* found a window obscuring the rectangle, now move win above this one */
2312 2313 2314 2315 2316 2317
        /* making sure to not violate the topmost rule */
        if (!(ptr->ex_style & WS_EX_TOPMOST) || (win->ex_style & WS_EX_TOPMOST))
        {
            list_remove( &win->entry );
            list_add_before( &ptr->entry, &win->entry );
        }
2318 2319 2320 2321 2322
        break;
    }
}


2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
/* mark parts of a window as needing a redraw */
DECL_HANDLER(redraw_window)
{
    struct region *region = NULL;
    struct window *win = get_window( req->window );

    if (!win) return;
    if (!is_visible( win )) return;  /* nothing to do */

    if (req->flags & (RDW_VALIDATE|RDW_INVALIDATE))
    {
        if (get_req_data_size())  /* no data means whole rectangle */
        {
            if (!(region = create_region_from_req_data( get_req_data(), get_req_data_size() )))
                return;
        }
    }

    redraw_window( win, region, (req->flags & RDW_INVALIDATE) && (req->flags & RDW_FRAME),
                   req->flags );
    if (region) free_region( region );
}


2347 2348 2349
/* set a window property */
DECL_HANDLER(set_window_property)
{
2350
    struct unicode_str name;
2351 2352
    struct window *win = get_window( req->window );

2353 2354
    if (!win) return;

2355 2356
    get_req_unicode_str( &name );
    if (name.len)
2357
    {
2358
        atom_t atom = add_global_atom( NULL, &name );
2359 2360
        if (atom)
        {
2361
            set_property( win, atom, req->handle, PROP_TYPE_STRING );
2362
            release_global_atom( NULL, atom );
2363 2364
        }
    }
2365
    else set_property( win, req->atom, req->handle, PROP_TYPE_ATOM );
2366 2367 2368 2369 2370 2371
}


/* remove a window property */
DECL_HANDLER(remove_window_property)
{
2372
    struct unicode_str name;
2373
    struct window *win = get_window( req->window );
2374

2375
    get_req_unicode_str( &name );
2376
    if (win)
2377
    {
2378
        atom_t atom = name.len ? find_global_atom( NULL, &name ) : req->atom;
2379
        if (atom) reply->handle = remove_property( win, atom );
2380
    }
2381 2382 2383 2384 2385 2386
}


/* get a window property */
DECL_HANDLER(get_window_property)
{
2387
    struct unicode_str name;
2388
    struct window *win = get_window( req->window );
2389

2390
    get_req_unicode_str( &name );
2391
    if (win)
2392
    {
2393
        atom_t atom = name.len ? find_global_atom( NULL, &name ) : req->atom;
2394 2395
        if (atom) reply->handle = get_property( win, atom );
    }
2396 2397 2398 2399 2400 2401
}


/* get the list of properties of a window */
DECL_HANDLER(get_window_properties)
{
2402 2403
    property_data_t *data;
    int i, count, max = get_reply_max_size() / sizeof(*data);
2404 2405
    struct window *win = get_window( req->window );

2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424
    reply->total = 0;
    if (!win) return;

    for (i = count = 0; i < win->prop_inuse; i++)
        if (win->properties[i].type != PROP_TYPE_FREE) count++;
    reply->total = count;

    if (count > max) count = max;
    if (!count || !(data = set_reply_data_size( count * sizeof(*data) ))) return;

    for (i = 0; i < win->prop_inuse && count; i++)
    {
        if (win->properties[i].type == PROP_TYPE_FREE) continue;
        data->atom   = win->properties[i].atom;
        data->string = (win->properties[i].type == PROP_TYPE_STRING);
        data->handle = win->properties[i].handle;
        data++;
        count--;
    }
2425
}
2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436


/* get the new window pointer for a global window, checking permissions */
/* helper for set_global_windows request */
static int get_new_global_window( struct window **win, user_handle_t handle )
{
    if (!handle)
    {
        *win = NULL;
        return 1;
    }
2437 2438 2439 2440 2441
    else if (*win)
    {
        set_error( STATUS_ACCESS_DENIED );
        return 0;
    }
2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476
    *win = get_window( handle );
    return (*win != NULL);
}

/* Set/get the global windows */
DECL_HANDLER(set_global_windows)
{
    struct window *new_shell_window   = shell_window;
    struct window *new_shell_listview = shell_listview;
    struct window *new_progman_window = progman_window;
    struct window *new_taskman_window = taskman_window;

    reply->old_shell_window   = shell_window ? shell_window->handle : 0;
    reply->old_shell_listview = shell_listview ? shell_listview->handle : 0;
    reply->old_progman_window = progman_window ? progman_window->handle : 0;
    reply->old_taskman_window = taskman_window ? taskman_window->handle : 0;

    if (req->flags & SET_GLOBAL_SHELL_WINDOWS)
    {
        if (!get_new_global_window( &new_shell_window, req->shell_window )) return;
        if (!get_new_global_window( &new_shell_listview, req->shell_listview )) return;
    }
    if (req->flags & SET_GLOBAL_PROGMAN_WINDOW)
    {
        if (!get_new_global_window( &new_progman_window, req->progman_window )) return;
    }
    if (req->flags & SET_GLOBAL_TASKMAN_WINDOW)
    {
        if (!get_new_global_window( &new_taskman_window, req->taskman_window )) return;
    }
    shell_window   = new_shell_window;
    shell_listview = new_shell_listview;
    progman_window = new_progman_window;
    taskman_window = new_taskman_window;
}
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/* retrieve layered info for a window */
DECL_HANDLER(get_window_layered_info)
{
    struct window *win = get_window( req->handle );

    if (!win) return;

    if (win->is_layered)
    {
        reply->color_key = win->color_key;
        reply->alpha     = win->alpha;
        reply->flags     = win->layered_flags;
    }
    else set_win32_error( ERROR_INVALID_WINDOW_HANDLE );
}


/* set layered info for a window */
DECL_HANDLER(set_window_layered_info)
{
    struct window *win = get_window( req->handle );

    if (!win) return;

    if (win->ex_style & WS_EX_LAYERED)
    {
        if (req->flags & LWA_ALPHA) win->alpha = req->alpha;
        else if (!win->is_layered) win->alpha = 0;  /* alpha init value is 0 */

        win->color_key     = req->color_key;
        win->layered_flags = req->flags;
        win->is_layered    = 1;
    }
    else set_win32_error( ERROR_INVALID_WINDOW_HANDLE );
}