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
  36 static HBRUSH hbrushPattern;
  37 static HBITMAP hbitmapWallPaper;
  38 static SIZE bitmapSize;
  39 static BOOL fTileWallPaper;
  40
  41
  42 /*********************************************************************
  43  * desktop class descriptor
  44  */
  45 const struct builtin_class_descr DESKTOP_builtin_class =
  46 {
  47     (LPCWSTR)DESKTOP_CLASS_ATOM, /* name */
  48     CS_DBLCLKS,           /* style */
  49     WINPROC_DESKTOP,      /* proc */
  50     0,                    /* extra */
  51     0,                    /* cursor */
  52     (HBRUSH)(COLOR_BACKGROUND+1)    /* brush */
  53 };
  54
  55
  56 /***********************************************************************
  57  *           DESKTOP_LoadBitmap
  58  */
  59 static HBITMAP DESKTOP_LoadBitmap( const WCHAR *filename )
  60 {
  61     HBITMAP hbitmap;
  62
  63     if (!filename[0]) return 0;
  64     hbitmap = LoadImageW( 0, filename, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  65     if (!hbitmap)
  66     {
  67         WCHAR buffer[MAX_PATH];
  68         UINT len = GetWindowsDirectoryW( buffer, MAX_PATH - 2 );
  69         if (buffer[len - 1] != '\\') buffer[len++] = '\\';
  70         lstrcpynW( buffer + len, filename, MAX_PATH - len );
  71         hbitmap = LoadImageW( 0, buffer, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  72     }
  73     return hbitmap;
  74 }
  75
  76 /***********************************************************************
  77  *           init_wallpaper
  78  */
  79 static void init_wallpaper( const WCHAR *wallpaper )
  80 {
  81     HBITMAP hbitmap = DESKTOP_LoadBitmap( wallpaper );
  82
  83     if (hbitmapWallPaper) DeleteObject( hbitmapWallPaper );
  84     hbitmapWallPaper = hbitmap;
  85     if (hbitmap)
  86     {
  87         BITMAP bmp;
  88         GetObjectA( hbitmap, sizeof(bmp), &bmp );
  89         bitmapSize.cx = (bmp.bmWidth != 0) ? bmp.bmWidth : 1;
  90         bitmapSize.cy = (bmp.bmHeight != 0) ? bmp.bmHeight : 1;
  91         fTileWallPaper = GetProfileIntA( "desktop", "TileWallPaper", 0 );
  92     }
  93 }
  94
  95 /***********************************************************************
  96  *           DesktopWndProc
  97  */
  98 LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
  99 {
 100     if (message == WM_NCCREATE) return TRUE;
 101     return 0;  /* all other messages are ignored */
 102 }
 103
 104 /***********************************************************************
 105  *           PaintDesktop   (USER32.@)
 106  *
 107  */
 108 BOOL WINAPI PaintDesktop(HDC hdc)
 109 {
 110     HWND hwnd = GetDesktopWindow();
 111
 112     /* check for an owning thread; otherwise don't paint anything (non-desktop mode) */
 113     if (GetWindowThreadProcessId( hwnd, NULL ))
 114     {
 115         RECT rect;
 116
 117         GetClientRect( hwnd, &rect );
 118
 119         /* Paint desktop pattern (only if wall paper does not cover everything) */
 120
 121         if (!hbitmapWallPaper ||
 122             (!fTileWallPaper && ((bitmapSize.cx < rect.right) || (bitmapSize.cy < rect.bottom))))
 123         {
 124             HBRUSH brush = hbrushPattern;
 125             if (!brush) brush = (HBRUSH)GetClassLongPtrW( hwnd, GCLP_HBRBACKGROUND );
 126             /* Set colors in case pattern is a monochrome bitmap */
 127             SetBkColor( hdc, RGB(0,0,0) );
 128             SetTextColor( hdc, GetSysColor(COLOR_BACKGROUND) );
 129             FillRect( hdc, &rect, brush );
 130         }
 131
 132         /* Paint wall paper */
 133
 134         if (hbitmapWallPaper)
 135         {
 136             INT x, y;
 137             HDC hMemDC = CreateCompatibleDC( hdc );
 138
 139             SelectObject( hMemDC, hbitmapWallPaper );
 140
 141             if (fTileWallPaper)
 142             {
 143                 for (y = 0; y < rect.bottom; y += bitmapSize.cy)
 144                     for (x = 0; x < rect.right; x += bitmapSize.cx)
 145                         BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 146             }
 147             else
 148             {
 149                 x = (rect.left + rect.right - bitmapSize.cx) / 2;
 150                 y = (rect.top + rect.bottom - bitmapSize.cy) / 2;
 151                 if (x < 0) x = 0;
 152                 if (y < 0) y = 0;
 153                 BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 154             }
 155             DeleteDC( hMemDC );
 156         }
 157     }
 158     return TRUE;
 159 }
 160
 161 /***********************************************************************
 162  *           SetDeskWallPaper   (USER32.@)
 163  *
 164  * FIXME: is there a unicode version?
 165  */
 166 BOOL WINAPI SetDeskWallPaper( LPCSTR filename )
 167 {
 168     return SystemParametersInfoA( SPI_SETDESKWALLPAPER, MAX_PATH, (void *)filename, SPIF_UPDATEINIFILE );
 169 }
 170
 171
 172 /***********************************************************************
 173  *           update_wallpaper
 174  */
 175 BOOL update_wallpaper( const WCHAR *wallpaper, const WCHAR *pattern )
 176 {
 177     int pat[8];
 178
 179     if (hbrushPattern) DeleteObject( hbrushPattern );
 180     hbrushPattern = 0;
 181     memset( pat, 0, sizeof(pat) );
 182     if (pattern)
 183     {
 184         char buffer[64];
 185         WideCharToMultiByte( CP_ACP, 0, pattern, -1, buffer, sizeof(buffer), NULL, NULL );
 186         if (sscanf( buffer, " %d %d %d %d %d %d %d %d",
 187                     &pat[0], &pat[1], &pat[2], &pat[3],
 188                     &pat[4], &pat[5], &pat[6], &pat[7] ))
 189         {
 190             WORD ptrn[8];
 191             HBITMAP hbitmap;
 192             int i;
 193
 194             for (i = 0; i < 8; i++) ptrn[i] = pat[i] & 0xffff;
 195             hbitmap = CreateBitmap( 8, 8, 1, 1, ptrn );
 196             hbrushPattern = CreatePatternBrush( hbitmap );
 197             DeleteObject( hbitmap );
 198         }
 199     }
 200     init_wallpaper( wallpaper );
 201     RedrawWindow( GetDesktopWindow(), 0, 0, RDW_INVALIDATE | RDW_ERASE | RDW_NOCHILDREN );
 202     return TRUE;
 203 }