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NtGdiGetPixel cleanup - fixed small bug with rect boundary checking, and cleaned up code to only unlock DC in one place.

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svn path=/trunk/; revision=8760
This commit is contained in:
Royce Mitchell III 2004-03-16 02:15:06 +00:00
parent ba96bd3821
commit 7d726b9519
2 changed files with 58 additions and 47 deletions
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24
reactos/include/rosrtl/gdimacro.h Normal file
View file

@ -0,0 +1,24 @@
/*
* gdimacro.h
*/
#ifndef ROSRTL_GDIMACRO_H
#define ROSRTL_GDIMACRO_H
#define IN_RECT(r,x,y) \
( \
(x) >= (r).left && \
(y) >= (r).top && \
(x) < (r).right && \
(y) < (r).bottom \
)
#define RECT_OVERLAP(a,b) \
( \
(a).left < (b).right && \
(b).left < (a).right && \
(a).top < (b).bottom && \
(b).top < (a).bottom \
)
#endif /* ROSRTL_GDIMACRO_H */

81
reactos/subsys/win32k/objects/bitmaps.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: bitmaps.c,v 1.62 2004/03/15 22:06:55 gvg Exp $ */
/* $Id: bitmaps.c,v 1.63 2004/03/16 02:15:06 royce Exp $ */
#undef WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdlib.h>
@ -33,6 +33,7 @@
#include <include/surface.h>
#include <include/palette.h>
#include <include/tags.h>
#include <rosrtl/gdimacro.h>
#define NDEBUG
#include <win32k/debug1.h>
@ -467,66 +468,52 @@ BOOL STDCALL NtGdiGetBitmapDimensionEx(HBITMAP hBitmap,
return TRUE;
}
COLORREF STDCALL NtGdiGetPixel(HDC hDC, INT XPos, INT YPos)
COLORREF
STDCALL
NtGdiGetPixel(HDC hDC, INT XPos, INT YPos)
{
PDC dc = NULL;
COLORREF Result = (COLORREF) 0;
COLORREF clrSource, Result = (COLORREF)CLR_INVALID; // default to failure
PSURFGDI Surface;
PSURFOBJ SurfaceObject;
HPALETTE Pal;
PPALGDI PalGDI;
USHORT PalMode;
PXLATEOBJ XlateObj = NULL;
PXLATEOBJ XlateObj;
dc = DC_LockDc (hDC);
if (dc == NULL)
if (dc != NULL)
{
return (COLORREF)CLR_INVALID;
}
if (XPos < dc->CombinedClip->rclBounds.left ||
XPos > dc->CombinedClip->rclBounds.right ||
YPos < dc->CombinedClip->rclBounds.top ||
YPos > dc->CombinedClip->rclBounds.bottom)
{
DC_UnlockDc(hDC);
return (COLORREF)CLR_INVALID;
}
SurfaceObject = (PSURFOBJ)AccessUserObject((ULONG)dc->Surface);
Surface = (PSURFGDI)AccessInternalObjectFromUserObject(SurfaceObject);
if (Surface == NULL || Surface->DIB_GetPixel == NULL)
{
DC_UnlockDc(hDC);
return (COLORREF)CLR_INVALID;
}
Result = Surface->DIB_GetPixel(SurfaceObject, XPos, YPos);
if ( IN_RECT(dc->CombinedClip->rclBounds,XPos,YPos) )
{
SurfaceObject = (PSURFOBJ)AccessUserObject((ULONG)dc->Surface);
ASSERT(SurfaceObject);
Surface = (PSURFGDI)AccessInternalObjectFromUserObject(SurfaceObject);
if ( Surface && Surface->DIB_GetPixel )
{
clrSource = Surface->DIB_GetPixel(SurfaceObject, XPos, YPos);
if (dc->w.hPalette != 0)
Pal = dc->w.hPalette;
else
Pal = NtGdiGetStockObject(DEFAULT_PALETTE);
PalGDI = PALETTE_LockPalette(Pal);
if ( PalGDI )
{
PalMode = PalGDI->Mode;
PALETTE_UnlockPalette(Pal);
if (dc->w.hPalette != 0)
{
Pal = dc->w.hPalette;
}
else
{
Pal = NtGdiGetStockObject(DEFAULT_PALETTE);
}
PalGDI = PALETTE_LockPalette(Pal);
if (NULL == PalGDI)
{
XlateObj = (PXLATEOBJ)IntEngCreateXlate ( PAL_RGB, PalMode, NULL, Pal );
if ( XlateObj )
{
Result = XLATEOBJ_iXlate(XlateObj, clrSource);
EngDeleteXlate(XlateObj);
}
}
}
}
DC_UnlockDc(hDC);
return (COLORREF)CLR_INVALID;
}
PalMode = PalGDI->Mode;
PALETTE_UnlockPalette(Pal);
XlateObj = (PXLATEOBJ) IntEngCreateXlate(PAL_RGB, PalMode, NULL, Pal);
if (NULL == XlateObj)
{
DC_UnlockDc(hDC);
return (COLORREF)CLR_INVALID;
}
Result = XLATEOBJ_iXlate(XlateObj, Result);
EngDeleteXlate(XlateObj);
DC_UnlockDc(hDC);
return Result;
}