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     IDC_ARROW,            /* cursor */
  52     (HBRUSH)(COLOR_BACKGROUND+1)    /* brush */
  53 };
  54
  55
  56 /***********************************************************************
  57  *           DESKTOP_LoadBitmap
  58  *
  59  * Load a bitmap from a file. Used by SetDeskWallPaper().
  60  */
  61 static HBITMAP DESKTOP_LoadBitmap( HDC hdc, const char *filename )
  62 {
  63     BITMAPFILEHEADER *fileHeader;
  64     BITMAPINFO *bitmapInfo;
  65     HBITMAP hbitmap;
  66     HFILE file;
  67     LPSTR buffer;
  68     LONG size;
  69
  70     /* Read all the file into memory */
  71
  72     if ((file = _lopen( filename, OF_READ )) == HFILE_ERROR)
  73     {
  74         UINT len = GetWindowsDirectoryA( NULL, 0 );
  75         if (!(buffer = HeapAlloc( GetProcessHeap(), 0,
  76                                   len + strlen(filename) + 2 )))
  77             return 0;
  78         GetWindowsDirectoryA( buffer, len + 1 );
  79         strcat( buffer, "\\" );
  80         strcat( buffer, filename );
  81         file = _lopen( buffer, OF_READ );
  82         HeapFree( GetProcessHeap(), 0, buffer );
  83     }
  84     if (file == HFILE_ERROR) return 0;
  85     size = _llseek( file, 0, 2 );
  86     if (!(buffer = HeapAlloc( GetProcessHeap(), 0, size )))
  87     {
  88         _lclose( file );
  89         return 0;
  90     }
  91     _llseek( file, 0, 0 );
  92     size = _lread( file, buffer, size );
  93     _lclose( file );
  94     fileHeader = (BITMAPFILEHEADER *)buffer;
  95     bitmapInfo = (BITMAPINFO *)(buffer + sizeof(BITMAPFILEHEADER));
  96
  97       /* Check header content */
  98     if ((fileHeader->bfType != 0x4d42) || (size < fileHeader->bfSize))
  99     {
 100         HeapFree( GetProcessHeap(), 0, buffer );
 101         return 0;
 102     }
 103     hbitmap = CreateDIBitmap( hdc, &bitmapInfo->bmiHeader, CBM_INIT,
 104                                 buffer + fileHeader->bfOffBits,
 105                                 bitmapInfo, DIB_RGB_COLORS );
 106     HeapFree( GetProcessHeap(), 0, buffer );
 107     return hbitmap;
 108 }
 109
 110
 111
 112 /***********************************************************************
 113  *           DesktopWndProc
 114  */
 115 LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
 116 {
 117     if (message == WM_NCCREATE) return TRUE;
 118     return 0;  /* all other messages are ignored */
 119 }
 120
 121 /***********************************************************************
 122  *           PaintDesktop   (USER32.@)
 123  *
 124  */
 125 BOOL WINAPI PaintDesktop(HDC hdc)
 126 {
 127     HWND hwnd = GetDesktopWindow();
 128
 129     /* check for an owning thread; otherwise don't paint anything (non-desktop mode) */
 130     if (GetWindowThreadProcessId( hwnd, NULL ))
 131     {
 132         RECT rect;
 133
 134         GetClientRect( hwnd, &rect );
 135
 136         /* Paint desktop pattern (only if wall paper does not cover everything) */
 137
 138         if (!hbitmapWallPaper ||
 139             (!fTileWallPaper && ((bitmapSize.cx < rect.right) || (bitmapSize.cy < rect.bottom))))
 140         {
 141             HBRUSH brush = hbrushPattern;
 142             if (!brush) brush = (HBRUSH)GetClassLongPtrW( hwnd, GCLP_HBRBACKGROUND );
 143             /* Set colors in case pattern is a monochrome bitmap */
 144             SetBkColor( hdc, RGB(0,0,0) );
 145             SetTextColor( hdc, GetSysColor(COLOR_BACKGROUND) );
 146             FillRect( hdc, &rect, brush );
 147         }
 148
 149         /* Paint wall paper */
 150
 151         if (hbitmapWallPaper)
 152         {
 153             INT x, y;
 154             HDC hMemDC = CreateCompatibleDC( hdc );
 155
 156             SelectObject( hMemDC, hbitmapWallPaper );
 157
 158             if (fTileWallPaper)
 159             {
 160                 for (y = 0; y < rect.bottom; y += bitmapSize.cy)
 161                     for (x = 0; x < rect.right; x += bitmapSize.cx)
 162                         BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 163             }
 164             else
 165             {
 166                 x = (rect.left + rect.right - bitmapSize.cx) / 2;
 167                 y = (rect.top + rect.bottom - bitmapSize.cy) / 2;
 168                 if (x < 0) x = 0;
 169                 if (y < 0) y = 0;
 170                 BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 171             }
 172             DeleteDC( hMemDC );
 173         }
 174     }
 175     return TRUE;
 176 }
 177
 178 /***********************************************************************
 179  *           SetDeskWallPaper   (USER32.@)
 180  *
 181  * FIXME: is there a unicode version?
 182  */
 183 BOOL WINAPI SetDeskWallPaper( LPCSTR filename )
 184 {
 185     HBITMAP hbitmap;
 186     HDC hdc;
 187     char buffer[256];
 188
 189     if (filename == (LPSTR)-1)
 190     {
 191         GetProfileStringA( "desktop", "WallPaper", "(None)", buffer, 256 );
 192         filename = buffer;
 193     }
 194     hdc = GetDC( 0 );
 195     hbitmap = DESKTOP_LoadBitmap( hdc, filename );
 196     ReleaseDC( 0, hdc );
 197     if (hbitmapWallPaper) DeleteObject( hbitmapWallPaper );
 198     hbitmapWallPaper = hbitmap;
 199     fTileWallPaper = GetProfileIntA( "desktop", "TileWallPaper", 0 );
 200     if (hbitmap)
 201     {
 202         BITMAP bmp;
 203         GetObjectA( hbitmap, sizeof(bmp), &bmp );
 204         bitmapSize.cx = (bmp.bmWidth != 0) ? bmp.bmWidth : 1;
 205         bitmapSize.cy = (bmp.bmHeight != 0) ? bmp.bmHeight : 1;
 206     }
 207     return TRUE;
 208 }
 209
 210
 211 /***********************************************************************
 212  *           DESKTOP_SetPattern
 213  *
 214  * Set the desktop pattern.
 215  */
 216 BOOL DESKTOP_SetPattern( LPCWSTR pattern )
 217 {
 218     int pat[8];
 219
 220     if (hbrushPattern) DeleteObject( hbrushPattern );
 221     hbrushPattern = 0;
 222     memset( pat, 0, sizeof(pat) );
 223     if (pattern)
 224     {
 225         char buffer[64];
 226         WideCharToMultiByte( CP_ACP, 0, pattern, -1, buffer, sizeof(buffer), NULL, NULL );
 227         if (sscanf( buffer, " %d %d %d %d %d %d %d %d",
 228                     &pat[0], &pat[1], &pat[2], &pat[3],
 229                     &pat[4], &pat[5], &pat[6], &pat[7] ))
 230         {
 231             WORD ptrn[8];
 232             HBITMAP hbitmap;
 233             int i;
 234
 235             for (i = 0; i < 8; i++) ptrn[i] = pat[i] & 0xffff;
 236             hbitmap = CreateBitmap( 8, 8, 1, 1, ptrn );
 237             hbrushPattern = CreatePatternBrush( hbitmap );
 238             DeleteObject( hbitmap );
 239         }
 240     }
 241     return TRUE;
 242 }