LBitmapBase::AlphaBlend

#include "ltwrappr.h"

virtual L_INT LBitmapBase::AlphaBlend (nXDst, nYDst, nWidth, nHeight, pBitmapSrc, nXSrc, nYSrc, nOpacity, uFlags=0)

L_INT nXDst;

x coordinate

L_INT nYDst;

y coordinate

L_INT nWidth;

width

L_INT nHeight;

height

LBitmapBase *pBitmapSrc;

pointer to an LBitmapBase object

L_INT nXSrc;

x coordinate

L_INT nYSrc;

y coordinate

L_INT nOpacity;

opacity value

L_UINT32 uFlags;

flags

Combines image data of both the class object's bitmap and the specified bitmap, using the specified opacity value. The class object's bitmap is considered as the destination bitmap and it will be updated with the result of the operation. The specified bitmap is considered as the source bitmap.

Parameter

Description

nXDst

The X coordinate of the origin of the destination rectangle.

nYDst

The Y coordinate of the origin of the destination rectangle.

nWidth

Width of the area to be combined, in pixels. This width applies to both the source and the destination areas.

nHeight

Height of the area to be combined, in pixels. This height applies to both the source and the destination areas.

pBitmapSrc

Pointer to the LBitmapBase that contains the source bitmap.

nXSrc

The X coordinate of the origin of the source rectangle.

nYSrc

The Y coordinate of the origin of the source rectangle.

nOpacity

Opacity value used when combining the areas from the source and destination bitmaps. The valid range is from 0 - 65535 for 64-bit, 48-bit and 16-bit grayscale images and from 0 - 4095 for 12-bit grayscale images. Otherwise, it is from 0 to 255.

uFlags

Reserved for future use. Must be 0.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

The opacity determines how much the destination bitmap will show through the source bitmap. For example, if the opacity is 255 (completely opaque) then the source image will appear and the destination image will not show through the source image at all. If the opacity is 128 (half opacity), then the pixels for that area will consist of 50 percent from the source image and 50 percent from the destination image.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTDIS
LTFIL
LTIMGEFX

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:

LBitmap::BricksTexture, LBitmap::Canvas, LBitmap::DisplaceMap, LBitmap::Fragment, LBitmap::Vignette, LBitmapBase::Underlay, LBitmapBase::Combine, LBitmapBase::FeatherAlphaBlend, LBitmapBase::CreateFadedMask

Topics:

Raster Image Functions: Combining Images

 

Processing an Image

 

Raster Image Functions: Processing an Image

Example

L_INT LBitmapBase__AlphaBlendExample(LBitmapBase & Bitmap, L_TCHAR * szFile1,  
                                                         L_TCHAR * szFile2) 
{ 
   L_INT nRet; 
   LBitmapBase BitmapSrc; 
 
   nRet =Bitmap.Load(szFile1); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet =BitmapSrc.Load(szFile2); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet =BitmapSrc.Size(2 * Bitmap.GetWidth() / 3, 
                        2 * Bitmap.GetHeight() / 3, 
                        SIZE_RESAMPLE); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet =Bitmap.AlphaBlend(Bitmap.GetWidth() / 6, 
                     Bitmap.GetHeight() / 6, 
                     BitmapSrc.GetWidth(), 
                     BitmapSrc.GetHeight(), 
                     &BitmapSrc, 
                     0, 
                     0, 
                     150); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
} 
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