#include "ltwrappr.h"
virtual L_INT LPaint::PaintRgnDCBuffer(LBuff, nRow, nCount=1, uROP3=SRCCOPY)
LBuffer& LBuff; |
an LBuffer object |
L_INT nRow; |
first row to paint |
L_INT nCount; |
number of rows to paint |
L_UINT32 uROP3; |
windows ROP code for display |
Paints image data into a device context from a buffer. This function works the same as LPaint::PaintDCBuffer, except that only the bitmap region is painted.
Parameter |
Description |
LBuff |
A LEAD buffer of type LBuffer that contains the image data to paint. |
nRow |
The first row to paint. The painted portion of any row may be limited by the bitmap object rectangles. |
nCount |
The number of rows to paint. The painted portion of any row may be limited by the bitmap object rectangles. |
uROP3 |
The Windows ROP code that determines how the destination rectangle is updated. This parameter takes the same codes as the Windows BitBlt() function. For ordinary painting, use SRCCOPY. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
The bitmap must be allocated before you can create a region for it. Therefore, if you use this function in a paint-while-load routine, you must use your callback function to create the region after the bitmap is allocated.
The LBuff parameter is passed by reference, and is a required parameter.
Required DLLs and Libraries
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64.
Functions: |
Class Members, LBitmapBase::RectToBitmap, LBitmapBase::RectFromBitmap |
Topics: |
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L_INT LPaint__PaintRgnDCBufferExample(LBitmapBase& LeadBitmap,HDC hDC)
{
L_INT nRet;
LPaint LeadPaint(&LeadBitmap,hDC);
LBitmapRgn LeadRegion;
L_INT i,nBytesPerLine ;
RECT Rect ;
Rect.left = 10 ;
Rect.top = 10 ;
Rect.right = 50 ;
Rect.bottom = 50 ;
LeadRegion.SetBitmap(&LeadBitmap) ;
nRet = LeadRegion.SetRgnRect(&Rect);
if(nRet != SUCCESS)
return nRet;
nBytesPerLine = LeadBitmap.GetBytesPerLine() ;
LBuffer LeadBuffer((DWORD)nBytesPerLine);
for (i=0;i<LeadBitmap.GetHeight();i++)
{
LeadBitmap.GetRow(&LeadBuffer,i) ;
nRet = LeadPaint.PaintRgnDCBuffer(LeadBuffer,i) ;
if(nRet != SUCCESS)
return nRet;
}
return SUCCESS;
}
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