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 <stdarg.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "winnls.h"
  29 #include "controls.h"
  30
  31 static HBRUSH hbrushPattern;
  32 static HBITMAP hbitmapWallPaper;
  33 static SIZE bitmapSize;
  34 static BOOL fTileWallPaper;
  35
  36
  37 /*********************************************************************
  38  * desktop class descriptor
  39  */
  40 const struct builtin_class_descr DESKTOP_builtin_class =
  41 {
  42     (LPCWSTR)DESKTOP_CLASS_ATOM, /* name */
  43     CS_DBLCLKS,           /* style */
  44     WINPROC_DESKTOP,      /* proc */
  45     0,                    /* extra */
  46     0,                    /* cursor */
  47     (HBRUSH)(COLOR_BACKGROUND+1)    /* brush */
  48 };
  49
  50
  51 /***********************************************************************
  52  *           DESKTOP_LoadBitmap
  53  */
  54 static HBITMAP DESKTOP_LoadBitmap( const WCHAR *filename )
  55 {
  56     HBITMAP hbitmap;
  57
  58     if (!filename[0]) return 0;
  59     hbitmap = LoadImageW( 0, filename, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  60     if (!hbitmap)
  61     {
  62         WCHAR buffer[MAX_PATH];
  63         UINT len = GetWindowsDirectoryW( buffer, MAX_PATH - 2 );
  64         if (buffer[len - 1] != '\\') buffer[len++] = '\\';
  65         lstrcpynW( buffer + len, filename, MAX_PATH - len );
  66         hbitmap = LoadImageW( 0, buffer, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  67     }
  68     return hbitmap;
  69 }
  70
  71 /***********************************************************************
  72  *           init_wallpaper
  73  */
  74 static void init_wallpaper( const WCHAR *wallpaper )
  75 {
  76     HBITMAP hbitmap = DESKTOP_LoadBitmap( wallpaper );
  77
  78     if (hbitmapWallPaper) DeleteObject( hbitmapWallPaper );
  79     hbitmapWallPaper = hbitmap;
  80     if (hbitmap)
  81     {
  82         BITMAP bmp;
  83         GetObjectA( hbitmap, sizeof(bmp), &bmp );
  84         bitmapSize.cx = (bmp.bmWidth != 0) ? bmp.bmWidth : 1;
  85         bitmapSize.cy = (bmp.bmHeight != 0) ? bmp.bmHeight : 1;
  86         fTileWallPaper = GetProfileIntA( "desktop", "TileWallPaper", 0 );
  87     }
  88 }
  89
  90 /***********************************************************************
  91  *           DesktopWndProc
  92  */
  93 LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
  94 {
  95     switch (message)
  96     {
  97     case WM_NCCREATE:
  98     case WM_NCCALCSIZE:
  99     case WM_PARENTNOTIFY:
 100         return NtUserMessageCall( hwnd, message, wParam, lParam, 0, NtUserDesktopWindowProc, FALSE );
 101
 102     default:
 103         if (message < WM_USER)
 104             return DefWindowProcW( hwnd, message, wParam, lParam );
 105         return NtUserMessageCall( hwnd, message, wParam, lParam, 0, NtUserDesktopWindowProc, FALSE );
 106     }
 107 }
 108
 109 /***********************************************************************
 110  *           PaintDesktop   (USER32.@)
 111  *
 112  */
 113 BOOL WINAPI PaintDesktop(HDC hdc)
 114 {
 115     HWND hwnd = GetDesktopWindow();
 116
 117     /* check for an owning thread; otherwise don't paint anything (non-desktop mode) */
 118     if (GetWindowThreadProcessId( hwnd, NULL ))
 119     {
 120         RECT rect;
 121
 122         GetClientRect( hwnd, &rect );
 123
 124         /* Paint desktop pattern (only if wall paper does not cover everything) */
 125
 126         if (!hbitmapWallPaper ||
 127             (!fTileWallPaper && ((bitmapSize.cx < rect.right) || (bitmapSize.cy < rect.bottom))))
 128         {
 129             HBRUSH brush = hbrushPattern;
 130             if (!brush) brush = (HBRUSH)GetClassLongPtrW( hwnd, GCLP_HBRBACKGROUND );
 131             /* Set colors in case pattern is a monochrome bitmap */
 132             SetBkColor( hdc, RGB(0,0,0) );
 133             SetTextColor( hdc, GetSysColor(COLOR_BACKGROUND) );
 134             FillRect( hdc, &rect, brush );
 135         }
 136
 137         /* Paint wall paper */
 138
 139         if (hbitmapWallPaper)
 140         {
 141             INT x, y;
 142             HDC hMemDC = CreateCompatibleDC( hdc );
 143
 144             SelectObject( hMemDC, hbitmapWallPaper );
 145
 146             if (fTileWallPaper)
 147             {
 148                 for (y = 0; y < rect.bottom; y += bitmapSize.cy)
 149                     for (x = 0; x < rect.right; x += bitmapSize.cx)
 150                         BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 151             }
 152             else
 153             {
 154                 x = (rect.left + rect.right - bitmapSize.cx) / 2;
 155                 y = (rect.top + rect.bottom - bitmapSize.cy) / 2;
 156                 if (x < 0) x = 0;
 157                 if (y < 0) y = 0;
 158                 BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 159             }
 160             DeleteDC( hMemDC );
 161         }
 162     }
 163     return TRUE;
 164 }
 165
 166 /***********************************************************************
 167  *           SetDeskWallPaper   (USER32.@)
 168  *
 169  * FIXME: is there a unicode version?
 170  */
 171 BOOL WINAPI SetDeskWallPaper( LPCSTR filename )
 172 {
 173     return SystemParametersInfoA( SPI_SETDESKWALLPAPER, MAX_PATH, (void *)filename, SPIF_UPDATEINIFILE );
 174 }
 175
 176
 177 /***********************************************************************
 178  *           update_wallpaper
 179  */
 180 BOOL update_wallpaper( const WCHAR *wallpaper, const WCHAR *pattern )
 181 {
 182     int pat[8];
 183
 184     if (hbrushPattern) DeleteObject( hbrushPattern );
 185     hbrushPattern = 0;
 186     memset( pat, 0, sizeof(pat) );
 187     if (pattern)
 188     {
 189         char buffer[64];
 190         WideCharToMultiByte( CP_ACP, 0, pattern, -1, buffer, sizeof(buffer), NULL, NULL );
 191         if (sscanf( buffer, " %d %d %d %d %d %d %d %d",
 192                     &pat[0], &pat[1], &pat[2], &pat[3],
 193                     &pat[4], &pat[5], &pat[6], &pat[7] ))
 194         {
 195             WORD ptrn[8];
 196             HBITMAP hbitmap;
 197             int i;
 198
 199             for (i = 0; i < 8; i++) ptrn[i] = pat[i] & 0xffff;
 200             hbitmap = CreateBitmap( 8, 8, 1, 1, ptrn );
 201             hbrushPattern = CreatePatternBrush( hbitmap );
 202             DeleteObject( hbitmap );
 203         }
 204     }
 205     init_wallpaper( wallpaper );
 206     NtUserRedrawWindow( GetDesktopWindow(), 0, 0, RDW_INVALIDATE | RDW_ERASE | RDW_NOCHILDREN );
 207     return TRUE;
 208 }