LPaint::PaintRgnDCBuffer

#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.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

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.

Platforms

Win32, x64.

See Also

Functions:

Class Members, LBitmapBase::RectToBitmap, LBitmapBase::RectFromBitmap

Topics:

Raster Image Functions: Displaying Images

 

Raster Image Functions: Palettes

 

Defining and Using a Bitmap Region

 

Handling Palette Changes

Example

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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