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 "controls.h"
  34 #include "wine/winuser16.h"
  35
  36 static HBRUSH hbrushPattern;
  37 static HBITMAP hbitmapWallPaper;
  38 static SIZE bitmapSize;
  39 static BOOL fTileWallPaper;
  40
  41 static LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam );
  42
  43
  44 /*********************************************************************
  45  * desktop class descriptor
  46  */
  47 const struct builtin_class_descr DESKTOP_builtin_class =
  48 {
  49     (LPCWSTR)DESKTOP_CLASS_ATOM, /* name */
  50     CS_DBLCLKS,           /* style */
  51     NULL,                 /* procA (winproc is Unicode only) */
  52     DesktopWndProc,       /* procW */
  53     0,                    /* extra */
  54     IDC_ARROW,            /* cursor */
  55     (HBRUSH)(COLOR_BACKGROUND+1)    /* brush */
  56 };
  57
  58
  59 /***********************************************************************
  60  *           DESKTOP_LoadBitmap
  61  *
  62  * Load a bitmap from a file. Used by SetDeskWallPaper().
  63  */
  64 static HBITMAP DESKTOP_LoadBitmap( HDC hdc, const char *filename )
  65 {
  66     BITMAPFILEHEADER *fileHeader;
  67     BITMAPINFO *bitmapInfo;
  68     HBITMAP hbitmap;
  69     HFILE file;
  70     LPSTR buffer;
  71     LONG size;
  72
  73     /* Read all the file into memory */
  74
  75     if ((file = _lopen( filename, OF_READ )) == HFILE_ERROR)
  76     {
  77         UINT len = GetWindowsDirectoryA( NULL, 0 );
  78         if (!(buffer = HeapAlloc( GetProcessHeap(), 0,
  79                                   len + strlen(filename) + 2 )))
  80             return 0;
  81         GetWindowsDirectoryA( buffer, len + 1 );
  82         strcat( buffer, "\\" );
  83         strcat( buffer, filename );
  84         file = _lopen( buffer, OF_READ );
  85         HeapFree( GetProcessHeap(), 0, buffer );
  86     }
  87     if (file == HFILE_ERROR) return 0;
  88     size = _llseek( file, 0, 2 );
  89     if (!(buffer = HeapAlloc( GetProcessHeap(), 0, size )))
  90     {
  91         _lclose( file );
  92         return 0;
  93     }
  94     _llseek( file, 0, 0 );
  95     size = _lread( file, buffer, size );
  96     _lclose( file );
  97     fileHeader = (BITMAPFILEHEADER *)buffer;
  98     bitmapInfo = (BITMAPINFO *)(buffer + sizeof(BITMAPFILEHEADER));
  99
 100       /* Check header content */
 101     if ((fileHeader->bfType != 0x4d42) || (size < fileHeader->bfSize))
 102     {
 103         HeapFree( GetProcessHeap(), 0, buffer );
 104         return 0;
 105     }
 106     hbitmap = CreateDIBitmap( hdc, &bitmapInfo->bmiHeader, CBM_INIT,
 107                                 buffer + fileHeader->bfOffBits,
 108                                 bitmapInfo, DIB_RGB_COLORS );
 109     HeapFree( GetProcessHeap(), 0, buffer );
 110     return hbitmap;
 111 }
 112
 113
 114
 115 /***********************************************************************
 116  *           DesktopWndProc
 117  */
 118 static LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
 119 {
 120     if (message == WM_NCCREATE) return TRUE;
 121     return 0;  /* all other messages are ignored */
 122 }
 123
 124 /***********************************************************************
 125  *           PaintDesktop   (USER32.@)
 126  *
 127  */
 128 BOOL WINAPI PaintDesktop(HDC hdc)
 129 {
 130     HWND hwnd = GetDesktopWindow();
 131
 132     /* check for an owning thread; otherwise don't paint anything (non-desktop mode) */
 133     if (GetWindowThreadProcessId( hwnd, NULL ))
 134     {
 135         RECT rect;
 136
 137         GetClientRect( hwnd, &rect );
 138
 139         /* Paint desktop pattern (only if wall paper does not cover everything) */
 140
 141         if (!hbitmapWallPaper ||
 142             (!fTileWallPaper && ((bitmapSize.cx < rect.right) || (bitmapSize.cy < rect.bottom))))
 143         {
 144             HBRUSH brush = hbrushPattern;
 145             if (!brush) brush = (HBRUSH)GetClassLongPtrW( hwnd, GCLP_HBRBACKGROUND );
 146             /* Set colors in case pattern is a monochrome bitmap */
 147             SetBkColor( hdc, RGB(0,0,0) );
 148             SetTextColor( hdc, GetSysColor(COLOR_BACKGROUND) );
 149             FillRect( hdc, &rect, brush );
 150         }
 151
 152         /* Paint wall paper */
 153
 154         if (hbitmapWallPaper)
 155         {
 156             INT x, y;
 157             HDC hMemDC = CreateCompatibleDC( hdc );
 158
 159             SelectObject( hMemDC, hbitmapWallPaper );
 160
 161             if (fTileWallPaper)
 162             {
 163                 for (y = 0; y < rect.bottom; y += bitmapSize.cy)
 164                     for (x = 0; x < rect.right; x += bitmapSize.cx)
 165                         BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 166             }
 167             else
 168             {
 169                 x = (rect.left + rect.right - bitmapSize.cx) / 2;
 170                 y = (rect.top + rect.bottom - bitmapSize.cy) / 2;
 171                 if (x < 0) x = 0;
 172                 if (y < 0) y = 0;
 173                 BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 174             }
 175             DeleteDC( hMemDC );
 176         }
 177     }
 178     return TRUE;
 179 }
 180
 181 /***********************************************************************
 182  *           SetDeskWallPaper   (USER32.@)
 183  *
 184  * FIXME: is there a unicode version?
 185  */
 186 BOOL WINAPI SetDeskWallPaper( LPCSTR filename )
 187 {
 188     HBITMAP hbitmap;
 189     HDC hdc;
 190     char buffer[256];
 191
 192     if (filename == (LPSTR)-1)
 193     {
 194         GetProfileStringA( "desktop", "WallPaper", "(None)", buffer, 256 );
 195         filename = buffer;
 196     }
 197     hdc = GetDC( 0 );
 198     hbitmap = DESKTOP_LoadBitmap( hdc, filename );
 199     ReleaseDC( 0, hdc );
 200     if (hbitmapWallPaper) DeleteObject( hbitmapWallPaper );
 201     hbitmapWallPaper = hbitmap;
 202     fTileWallPaper = GetProfileIntA( "desktop", "TileWallPaper", 0 );
 203     if (hbitmap)
 204     {
 205         BITMAP bmp;
 206         GetObjectA( hbitmap, sizeof(bmp), &bmp );
 207         bitmapSize.cx = (bmp.bmWidth != 0) ? bmp.bmWidth : 1;
 208         bitmapSize.cy = (bmp.bmHeight != 0) ? bmp.bmHeight : 1;
 209     }
 210     return TRUE;
 211 }
 212
 213
 214 /***********************************************************************
 215  *           DESKTOP_SetPattern
 216  *
 217  * Set the desktop pattern.
 218  */
 219 BOOL DESKTOP_SetPattern( LPCWSTR pattern )
 220 {
 221     int pat[8];
 222
 223     if (hbrushPattern) DeleteObject( hbrushPattern );
 224     hbrushPattern = 0;
 225     memset( pat, 0, sizeof(pat) );
 226     if (pattern)
 227     {
 228         char buffer[64];
 229         WideCharToMultiByte( CP_ACP, 0, pattern, -1, buffer, sizeof(buffer), NULL, NULL );
 230         if (sscanf( buffer, " %d %d %d %d %d %d %d %d",
 231                     &pat[0], &pat[1], &pat[2], &pat[3],
 232                     &pat[4], &pat[5], &pat[6], &pat[7] ))
 233         {
 234             WORD pattern[8];
 235             HBITMAP hbitmap;
 236             int i;
 237
 238             for (i = 0; i < 8; i++) pattern[i] = pat[i] & 0xffff;
 239             hbitmap = CreateBitmap( 8, 8, 1, 1, pattern );
 240             hbrushPattern = CreatePatternBrush( hbitmap );
 241             DeleteObject( hbitmap );
 242         }
 243     }
 244     return TRUE;
 245 }