subsys/win32k/eng/transblt.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * PURPOSE:          GDI TransparentBlt Function
   5  * FILE:             subsys/win32k/eng/transblt.c
   6  * PROGRAMER:        Jason Filby
   7  * REVISION HISTORY:
   8  *        4/6/2001: Created
   9  */
  10
  11 #include <ddk/winddi.h>
  12 #include <ddk/ntddk.h>
  13 #include <ntos/minmax.h>
  14 #include <include/dib.h>
  15 #include <include/object.h>
  16 #include <include/surface.h>
  17
  18 #include "brush.h"
  19 #include "clip.h"
  20 #include "objects.h"
  21
  22 #include <include/mouse.h>
  23
  24 BOOL STDCALL
  25 EngTransparentBlt(PSURFOBJ Dest,
  26                   PSURFOBJ Source,
  27                   PCLIPOBJ Clip,
  28                   PXLATEOBJ ColorTranslation,
  29                   PRECTL DestRect,
  30                   PRECTL SourceRect,
  31                   ULONG TransparentColor,
  32                   ULONG Reserved)
  33 {
  34   PSURFGDI DestGDI   = (PSURFGDI)AccessInternalObjectFromUserObject(Dest),
  35            SourceGDI = (PSURFGDI)AccessInternalObjectFromUserObject(Source);
  36   HSURF     hTemp;
  37   PSURFOBJ  TempSurf;
  38   POINTL    TempPoint, SourcePoint;
  39   RECTL     TempRect;
  40   SIZEL     TempSize;
  41   BOOLEAN   ret;
  42   LONG dx, dy, sx, sy;
  43
  44   dx = abs(DestRect->right  - DestRect->left);
  45   dy = abs(DestRect->bottom - DestRect->top);
  46
  47   sx = abs(SourceRect->right  - SourceRect->left);
  48   sy = abs(SourceRect->bottom - SourceRect->top);
  49
  50   if(sx<dx) dx = sx;
  51   if(sy<dy) dy = sy;
  52
  53   MouseSafetyOnDrawStart(Source, SourceGDI, SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom);
  54   MouseSafetyOnDrawStart(Dest, DestGDI, DestRect->left, DestRect->top, DestRect->right, DestRect->bottom);
  55
  56   if(DestGDI->TransparentBlt != NULL)
  57   {
  58     // The destination is device managed, therefore get the source into a format compatible surface
  59     TempPoint.x = 0;
  60     TempPoint.y = 0;
  61     TempRect.top    = 0;
  62     TempRect.left   = 0;
  63     TempRect.bottom = dy;
  64     TempRect.right  = dx;
  65     TempSize.cx = TempRect.right;
  66     TempSize.cy = TempRect.bottom;
  67
  68     hTemp = EngCreateBitmap(TempSize,
  69                             DIB_GetDIBWidthBytes(dx, BitsPerFormat(Dest->iBitmapFormat)),
  70                             Dest->iBitmapFormat, 0, NULL);
  71     TempSurf = (PSURFOBJ)AccessUserObject((ULONG)hTemp);
  72
  73     SourcePoint.x = SourceRect->left;
  74     SourcePoint.y = SourceRect->top;
  75
  76     // FIXME: Skip creating a TempSurf if we have the same BPP and palette
  77     EngBitBlt(TempSurf, Source, NULL, NULL, ColorTranslation, &TempRect, &SourcePoint, NULL, NULL, NULL, 0);
  78
  79     ret = DestGDI->TransparentBlt(Dest, TempSurf, Clip, NULL, DestRect, SourceRect,
  80                                   TransparentColor, Reserved);
  81
  82     MouseSafetyOnDrawEnd(Source, SourceGDI);
  83     MouseSafetyOnDrawEnd(Dest, DestGDI);
  84
  85     if(EngDeleteSurface(hTemp) == FALSE)
  86     {
  87       DbgPrint("Win32k: Failed to delete surface: %d\n", hTemp);
  88       return FALSE;
  89     }
  90
  91     return ret;
  92   }
  93
  94   // Simulate a transparent blt
  95
  96   MouseSafetyOnDrawEnd(Source, SourceGDI);
  97   MouseSafetyOnDrawEnd(Dest, DestGDI);
  98
  99   return TRUE;
 100 }