dlls/user32/desktop.c

   1 /*
   2  * Desktop window class.
   3  *
   4  * Copyright 1994 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winnls.h"
  34 #include "controls.h"
  35 #include "wine/unicode.h"
  36
  37 static HBRUSH hbrushPattern;
  38 static HBITMAP hbitmapWallPaper;
  39 static SIZE bitmapSize;
  40 static BOOL fTileWallPaper;
  41
  42
  43 /*********************************************************************
  44  * desktop class descriptor
  45  */
  46 const struct builtin_class_descr DESKTOP_builtin_class =
  47 {
  48     (LPCWSTR)DESKTOP_CLASS_ATOM, /* name */
  49     CS_DBLCLKS,           /* style */
  50     WINPROC_DESKTOP,      /* proc */
  51     0,                    /* extra */
  52     0,                    /* cursor */
  53     (HBRUSH)(COLOR_BACKGROUND+1)    /* brush */
  54 };
  55
  56
  57 /***********************************************************************
  58  *           DESKTOP_LoadBitmap
  59  */
  60 static HBITMAP DESKTOP_LoadBitmap( const WCHAR *filename )
  61 {
  62     HBITMAP hbitmap;
  63
  64     if (!filename[0]) return 0;
  65     hbitmap = LoadImageW( 0, filename, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  66     if (!hbitmap)
  67     {
  68         WCHAR buffer[MAX_PATH];
  69         UINT len = GetWindowsDirectoryW( buffer, MAX_PATH - 2 );
  70         if (buffer[len - 1] != '\\') buffer[len++] = '\\';
  71         lstrcpynW( buffer + len, filename, MAX_PATH - len );
  72         hbitmap = LoadImageW( 0, buffer, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  73     }
  74     return hbitmap;
  75 }
  76
  77 /***********************************************************************
  78  *           init_wallpaper
  79  */
  80 static void init_wallpaper( const WCHAR *wallpaper )
  81 {
  82     HBITMAP hbitmap = DESKTOP_LoadBitmap( wallpaper );
  83
  84     if (hbitmapWallPaper) DeleteObject( hbitmapWallPaper );
  85     hbitmapWallPaper = hbitmap;
  86     if (hbitmap)
  87     {
  88         BITMAP bmp;
  89         GetObjectA( hbitmap, sizeof(bmp), &bmp );
  90         bitmapSize.cx = (bmp.bmWidth != 0) ? bmp.bmWidth : 1;
  91         bitmapSize.cy = (bmp.bmHeight != 0) ? bmp.bmHeight : 1;
  92         fTileWallPaper = GetProfileIntA( "desktop", "TileWallPaper", 0 );
  93     }
  94 }
  95
  96 /***********************************************************************
  97  *           DesktopWndProc
  98  */
  99 LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
 100 {
 101     static const WCHAR display_device_guid_propW[] = {
 102         '_','_','w','i','n','e','_','d','i','s','p','l','a','y','_',
 103         'd','e','v','i','c','e','_','g','u','i','d',0 };
 104     static const WCHAR guid_formatW[] = {
 105         '%','0','8','x','-','%','0','4','x','-','%','0','4','x','-','%','0','2','x','%','0','2','x','-',
 106         '%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x',0};
 107
 108     switch (message)
 109     {
 110     case WM_NCCREATE:
 111     {
 112         CREATESTRUCTW *cs = (CREATESTRUCTW *)lParam;
 113         const GUID *guid = cs->lpCreateParams;
 114
 115         if (guid)
 116         {
 117             ATOM atom;
 118             WCHAR buffer[37];
 119
 120             if (GetAncestor( hwnd, GA_PARENT )) return FALSE;  /* refuse to create non-desktop window */
 121
 122             sprintfW( buffer, guid_formatW, guid->Data1, guid->Data2, guid->Data3,
 123                       guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3],
 124                       guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7] );
 125             atom = GlobalAddAtomW( buffer );
 126             SetPropW( hwnd, display_device_guid_propW, ULongToHandle( atom ) );
 127         }
 128         return TRUE;
 129     }
 130     default:
 131         return 0;  /* all other messages are ignored */
 132     }
 133 }
 134
 135 /***********************************************************************
 136  *           PaintDesktop   (USER32.@)
 137  *
 138  */
 139 BOOL WINAPI PaintDesktop(HDC hdc)
 140 {
 141     HWND hwnd = GetDesktopWindow();
 142
 143     /* check for an owning thread; otherwise don't paint anything (non-desktop mode) */
 144     if (GetWindowThreadProcessId( hwnd, NULL ))
 145     {
 146         RECT rect;
 147
 148         GetClientRect( hwnd, &rect );
 149
 150         /* Paint desktop pattern (only if wall paper does not cover everything) */
 151
 152         if (!hbitmapWallPaper ||
 153             (!fTileWallPaper && ((bitmapSize.cx < rect.right) || (bitmapSize.cy < rect.bottom))))
 154         {
 155             HBRUSH brush = hbrushPattern;
 156             if (!brush) brush = (HBRUSH)GetClassLongPtrW( hwnd, GCLP_HBRBACKGROUND );
 157             /* Set colors in case pattern is a monochrome bitmap */
 158             SetBkColor( hdc, RGB(0,0,0) );
 159             SetTextColor( hdc, GetSysColor(COLOR_BACKGROUND) );
 160             FillRect( hdc, &rect, brush );
 161         }
 162
 163         /* Paint wall paper */
 164
 165         if (hbitmapWallPaper)
 166         {
 167             INT x, y;
 168             HDC hMemDC = CreateCompatibleDC( hdc );
 169
 170             SelectObject( hMemDC, hbitmapWallPaper );
 171
 172             if (fTileWallPaper)
 173             {
 174                 for (y = 0; y < rect.bottom; y += bitmapSize.cy)
 175                     for (x = 0; x < rect.right; x += bitmapSize.cx)
 176                         BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 177             }
 178             else
 179             {
 180                 x = (rect.left + rect.right - bitmapSize.cx) / 2;
 181                 y = (rect.top + rect.bottom - bitmapSize.cy) / 2;
 182                 if (x < 0) x = 0;
 183                 if (y < 0) y = 0;
 184                 BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 185             }
 186             DeleteDC( hMemDC );
 187         }
 188     }
 189     return TRUE;
 190 }
 191
 192 /***********************************************************************
 193  *           SetDeskWallPaper   (USER32.@)
 194  *
 195  * FIXME: is there a unicode version?
 196  */
 197 BOOL WINAPI SetDeskWallPaper( LPCSTR filename )
 198 {
 199     return SystemParametersInfoA( SPI_SETDESKWALLPAPER, MAX_PATH, (void *)filename, SPIF_UPDATEINIFILE );
 200 }
 201
 202
 203 /***********************************************************************
 204  *           update_wallpaper
 205  */
 206 BOOL update_wallpaper( const WCHAR *wallpaper, const WCHAR *pattern )
 207 {
 208     int pat[8];
 209
 210     if (hbrushPattern) DeleteObject( hbrushPattern );
 211     hbrushPattern = 0;
 212     memset( pat, 0, sizeof(pat) );
 213     if (pattern)
 214     {
 215         char buffer[64];
 216         WideCharToMultiByte( CP_ACP, 0, pattern, -1, buffer, sizeof(buffer), NULL, NULL );
 217         if (sscanf( buffer, " %d %d %d %d %d %d %d %d",
 218                     &pat[0], &pat[1], &pat[2], &pat[3],
 219                     &pat[4], &pat[5], &pat[6], &pat[7] ))
 220         {
 221             WORD ptrn[8];
 222             HBITMAP hbitmap;
 223             int i;
 224
 225             for (i = 0; i < 8; i++) ptrn[i] = pat[i] & 0xffff;
 226             hbitmap = CreateBitmap( 8, 8, 1, 1, ptrn );
 227             hbrushPattern = CreatePatternBrush( hbitmap );
 228             DeleteObject( hbitmap );
 229         }
 230     }
 231     init_wallpaper( wallpaper );
 232     RedrawWindow( GetDesktopWindow(), 0, 0, RDW_INVALIDATE | RDW_ERASE | RDW_NOCHILDREN );
 233     return TRUE;
 234 }