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