LBitmapBase::GetPixelData

#include "ltwrappr.h"

virtual L_INT LBitmapBase::GetPixelData(pData, nRow, nCol, nBytes)

L_VOID *pData;

pointer to a buffer

L_INT nRow;

row number of the pixel

L_INT nCol;

column number of the pixel

L_INT nBytes;

size of the buffer

Gets the data of the specified pixel. No transformations are performed on the pixel data.

Parameter

Description

pData

Pointer to a buffer to be updated with the pixel data. This buffer should be able to store nBytes bytes.

nRow

The row number of the pixel.

nCol

The column number of the pixel.

nBytes

Size of the buffer pointed to by pData. The size should be large enough to contain the data for the pixel. The minimum size can be calculated with the following formula: (LBitmapBase::GetBitsPerPixel + 7) / 8.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

This function should be called only for 8, 16, 24, 32, 48 and 64-bit bitmaps:

This function will return an error if nBytes is smaller than it should be. The minimum value for nSize is indicated in a formula above.

Required DLLs and Libraries

LTDIS
LTFIL

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:

LBitmapBase::Access, LBitmapBase::Release, LBitmapBase::GetRow, LBitmapBase::PutRow, LBitmapBase::GetRowCol, LBitmapBase::PutRowCol, LBitmapBase::GetPixelColor, LBitmapBase::PutPixelColor, Class Members

Topics:

Raster Image Functions: Getting and Setting Pixel Values

 

Processing an Image

Example

L_INT LBitmapBase__GetPixelDataExample(LBitmapBase & Bitmap, L_TCHAR * pszFile, L_INT nRow,  
                                                        L_INT nCol) 
{ 
   L_INT nRet; 
   L_UINT uTempValue; 
 
   nRet =Bitmap.Load(pszFile); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   if (Bitmap.GetBitsPerPixel() == 24 ||  
       Bitmap.GetBitsPerPixel() == 32) 
   { 
      L_UCHAR aPixel[4]; // Make it large enough for both bitmap types 
       
      nRet =Bitmap.GetPixelData(aPixel, nRow, nCol, sizeof(aPixel)); 
      if(nRet !=SUCCESS) 
         return nRet; 
 
      // Swap the red and blue values 
      uTempValue = aPixel[0]; 
      aPixel[0] = aPixel[2]; 
      aPixel[2] = (L_UCHAR) uTempValue; 
 
      // Put back the transformed pixel 
      nRet =Bitmap.PutPixelData(aPixel, nRow, nCol, sizeof(aPixel)); 
      if(nRet !=SUCCESS) 
         return nRet; 
   } 
   else if (Bitmap.GetBitsPerPixel() == 48 ||  
            Bitmap.GetBitsPerPixel() == 64) 
   { 
      L_UINT16 aPixel[4]; // Make it large enough for both bitmap types 
       
      nRet =Bitmap.GetPixelData(aPixel, nRow, nCol, sizeof(aPixel)); 
      if(nRet !=SUCCESS) 
         return nRet; 
 
      // Swap the red and blue values 
      uTempValue = aPixel[0]; 
      aPixel[0] = aPixel[2]; 
      aPixel[2] = (L_UINT16) uTempValue; 
 
      // Put back the transformed pixel 
      nRet =Bitmap.PutPixelData(aPixel, nRow, nCol, sizeof(aPixel)); 
      if(nRet !=SUCCESS) 
         return nRet; 
   } 
   else 
   { 
      MessageBox(NULL, TEXT("This example works only with 24-, 32-, 48- and 64-bit bitmaps!"),  
                 TEXT("Testing"), MB_OK); 
      return FAILURE; 
   } 
   return SUCCESS; 
} 
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