home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Komputer for Alle 1998 #2
/
K-CD 0298.iso
/
wing
/
tblt.c_
/
tblt.c
Wrap
Text File
|
1995-06-20
|
4KB
|
141 lines
/**************************************************************************
TBLT.C - transparent blt
**************************************************************************/
/**************************************************************************
(C) Copyright 1994 Microsoft Corp. All rights reserved.
You have a royalty-free right to use, modify, reproduce and
distribute the Sample Files (and/or any modified version) in
any way you find useful, provided that you agree that
Microsoft has no warranty obligations or liability for any
Sample Application Files which are modified.
**************************************************************************/
#include <windows.h>
#include <windowsx.h>
#include <wing.h>
#include "..\utils\utils.h"
extern void PASCAL far TransCopyDIBBits( WORD DestSelector, DWORD DestOffset,
void const far *pSource, DWORD Width, DWORD Height, long DestWidth,
long SourceWidth, char unsigned TransparentColor );
/*----------------------------------------------------------------------------
This function ignores the source origin and blts the entire source.
*/
BOOL TransparentDIBits( BITMAPINFO far *pBufferHeader,
void huge *pBufferBits,
int nXOriginDest, int nYOriginDest, void const far *pBits,
BITMAPINFO const far *pBitmapInfo, int nXOriginSrc, int nYOriginSrc,
int iUsage, char unsigned TransparentColor )
{
BOOL ReturnValue = FALSE;
int NewDestinationXOrigin;
int NewDestinationYOrigin;
int DestinationDeltaX;
int DestinationDeltaY;
int Width;
int Height;
int NewSourceXOrigin;
int NewSourceYOrigin;
int Orientation = 1;
int DestinationHeight = DibHeight(&pBufferHeader->bmiHeader);
int SourceWidth = DibWidth(&pBitmapInfo->bmiHeader);
int SourceHeight = DibHeight(&pBitmapInfo->bmiHeader);
char unsigned huge *pSource;
WORD DestSelector;
DWORD DestOffset;
RECT SourceRectangle = { nXOriginDest, nYOriginDest,
nXOriginDest + SourceWidth, nYOriginDest + SourceHeight };
RECT DestinationRectangle;
RECT ClippedRectangle;
if(DestinationHeight < 0) // check for top-down DIB
{
Orientation = -1;
DestinationHeight = -DestinationHeight;
}
DestinationRectangle.top = 0;
DestinationRectangle.left = 0;
DestinationRectangle.bottom = DestinationHeight;
DestinationRectangle.right = DibWidth(&pBufferHeader->bmiHeader);
// intersect the destination rectangle with the destination DIB
if(IntersectRect(&ClippedRectangle,&SourceRectangle,
&DestinationRectangle))
{
// default delta scan to width in bytes
long DestinationScanDelta = DibWidthBytes(&pBufferHeader->bmiHeader);
NewDestinationXOrigin = ClippedRectangle.left;
NewDestinationYOrigin = ClippedRectangle.top;
DestinationDeltaX = NewDestinationXOrigin - nXOriginDest;
DestinationDeltaY = NewDestinationYOrigin - nYOriginDest;
Width = ClippedRectangle.right - ClippedRectangle.left;
Height = ClippedRectangle.bottom - ClippedRectangle.top;
pSource = (char unsigned huge *)pBits;
NewSourceXOrigin = DestinationDeltaX;
NewSourceYOrigin = DestinationDeltaY;
pSource += ((long)SourceHeight - (NewSourceYOrigin + Height)) *
(long)DibWidthBytes(&pBitmapInfo->bmiHeader)
+ NewSourceXOrigin;
// now we'll calculate the starting destination pointer taking into
// account we may have a top-down destination
DestSelector = HIWORD(pBufferBits);
if(Orientation < 0)
{
// destination is top-down
DestinationScanDelta *= -1;
DestOffset = (long)(NewDestinationYOrigin + Height - 1) *
(long)DibWidthBytes(&pBufferHeader->bmiHeader) +
NewDestinationXOrigin;
}
else
{
// destination is bottom-up
DestOffset = ((long)DestinationHeight -
(NewDestinationYOrigin + Height))
* (long)DibWidthBytes(&pBufferHeader->bmiHeader) +
NewDestinationXOrigin;
}
TransCopyDIBBits(DestSelector,DestOffset,pSource,Width,Height,
DestinationScanDelta,
DibWidthBytes(&pBitmapInfo->bmiHeader),
TransparentColor);
ReturnValue = TRUE;
}
return ReturnValue;
}