subsys/win32k/eng/transblt.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * COPYRIGHT:        See COPYING in the top level directory
  22  * PROJECT:          ReactOS kernel
  23  * PURPOSE:          GDI TransparentBlt Function
  24  * FILE:             subsys/win32k/eng/transblt.c
  25  * PROGRAMER:        Jason Filby
  26  * REVISION HISTORY:
  27  *        4/6/2001: Created
  28  */
  29
  30 #include <ddk/winddi.h>
  31 #include <ddk/ntddk.h>
  32 #include <ddk/ntddmou.h>
  33 #include <ntos/minmax.h>
  34 #include <include/dib.h>
  35 #include <include/object.h>
  36 #include <include/surface.h>
  37
  38 #include "brush.h"
  39 #include "clip.h"
  40 #include "objects.h"
  41
  42 #include <include/mouse.h>
  43
  44 BOOL STDCALL
  45 EngTransparentBlt(PSURFOBJ Dest,
  46                   PSURFOBJ Source,
  47                   PCLIPOBJ Clip,
  48                   PXLATEOBJ ColorTranslation,
  49                   PRECTL DestRect,
  50                   PRECTL SourceRect,
  51                   ULONG TransparentColor,
  52                   ULONG Reserved)
  53 {
  54   PSURFGDI DestGDI   = (PSURFGDI)AccessInternalObjectFromUserObject(Dest),
  55            SourceGDI = (PSURFGDI)AccessInternalObjectFromUserObject(Source);
  56   HSURF     hTemp;
  57   PSURFOBJ  TempSurf;
  58   POINTL    TempPoint, SourcePoint;
  59   RECTL     TempRect;
  60   SIZEL     TempSize;
  61   BOOLEAN   ret;
  62   LONG dx, dy, sx, sy;
  63
  64   dx = abs(DestRect->right  - DestRect->left);
  65   dy = abs(DestRect->bottom - DestRect->top);
  66
  67   sx = abs(SourceRect->right  - SourceRect->left);
  68   sy = abs(SourceRect->bottom - SourceRect->top);
  69
  70   if(sx<dx) dx = sx;
  71   if(sy<dy) dy = sy;
  72
  73   MouseSafetyOnDrawStart(Source, SourceGDI, SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom);
  74   MouseSafetyOnDrawStart(Dest, DestGDI, DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);
  75
  76   if(DestGDI->TransparentBlt != NULL)
  77   {
  78     // The destination is device managed, therefore get the source into a format compatible surface
  79     TempPoint.x = 0;
  80     TempPoint.y = 0;
  81     TempRect.top    = 0;
  82     TempRect.left   = 0;
  83     TempRect.bottom = dy;
  84     TempRect.right  = dx;
  85     TempSize.cx = TempRect.right;
  86     TempSize.cy = TempRect.bottom;
  87
  88     hTemp = EngCreateBitmap(TempSize,
  89                             DIB_GetDIBWidthBytes(dx, BitsPerFormat(Dest->iBitmapFormat)),
  90                             Dest->iBitmapFormat, 0, NULL);
  91     TempSurf = (PSURFOBJ)AccessUserObject((ULONG)hTemp);
  92
  93     SourcePoint.x = SourceRect->left;
  94     SourcePoint.y = SourceRect->top;
  95
  96     // FIXME: Skip creating a TempSurf if we have the same BPP and palette
  97     EngBitBlt(TempSurf, Source, NULL, NULL, ColorTranslation, &TempRect, &SourcePoint, NULL, NULL, NULL, 0);
  98
  99     ret = DestGDI->TransparentBlt(Dest, TempSurf, Clip, NULL, DestRect, SourceRect,
 100                                   TransparentColor, Reserved);
 101
 102     MouseSafetyOnDrawEnd(Source, SourceGDI);
 103     MouseSafetyOnDrawEnd(Dest, DestGDI);
 104
 105     if(EngDeleteSurface(hTemp) == FALSE)
 106     {
 107       DbgPrint("Win32k: Failed to delete surface: %d\n", hTemp);
 108       return FALSE;
 109     }
 110
 111     return ret;
 112   }
 113
 114   // Simulate a transparent blt
 115
 116   MouseSafetyOnDrawEnd(Source, SourceGDI);
 117   MouseSafetyOnDrawEnd(Dest, DestGDI);
 118
 119   return TRUE;
 120 }
 121 /* EOF */