L_FeatherAlphaBlendBitmap
#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_FeatherAlphaBlendBitmap(pBitmapDst, nXDst, nYDst, nWidth, nHeight, pBitmapSrc, nXSrc, nYSrc, pBitmapMask, nXMaskShift, nYMaskShift)
|
pBITMAPHANDLE pBitmapDst; |
/* pointer to the bitmap handle */ |
|
L_INT nXDst; |
/* x coordinate */ |
|
L_INT nYDst; |
/* y coordinate */ |
|
L_INT nWidth; |
/* width */ |
|
L_INT nHeight; |
/* height */ |
|
pBITMAPHANDLE pBitmapSrc; |
/* pointer to a bitmap handle */ |
|
L_INT nXSrc; |
/* x coordinate */ |
|
L_INT nYSrc; |
/* y coordinate */ |
|
pBITMAPHANDLE pBitmapMask; |
/* pointer to a bitmap handle */ |
|
L_INT nXMaskShift; |
/* x coordinate */ |
|
L_INT nYMaskShift; |
/* y coordinate */ |
Combines image data from two bitmaps with feathering. The two bitmaps can be combined with a variable opacity applied by specifying the region of a fade mask.
|
Parameter |
Description |
|
pBitmapDst |
Pointer to the bitmap handle that references the destination bitmap. The function will update this bitmap. |
|
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 bitmap handle that references 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. |
|
pBitmapMask |
Pointer to the bitmap handle that references the fade mask. |
|
nXMaskShift |
The X coordinate of the origin of the mask rectangle. |
|
nYMaskShift |
The Y coordinate of the origin of the mask rectangle. |
Returns
|
SUCCESS |
The function was successful. |
|
< 1 |
An error occurred. Refer to Return Codes. |
Comments
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.
To combine two bitmaps with a fixed opacity, use the L_AlphaBlendBitmap function.
The L_FeatherAlphaBlendBitmap function achieves feathering between two bitmaps by using variable opacity values, obtained from the fade mask referenced by pBitmapMask. The origin coordinates of the region of the fade mask bitmap are specified by the values of nXMaskShift and nYMaskShift parameters.
To create a bitmap that contains a fade mask, use L_CreateFadedMask function.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
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 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
|
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
Windows 2000 / XP/Vista.
See Also
Example
L_INT FeatherAlphaBlendBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE BitmapDst; /* Bitmap handle to hold the loaded image */
BITMAPHANDLE BitmapSrc; /* source bitmap */
BITMAPHANDLE BitmapMask; /* Bitmap handle to the fade mask bitmap */
RECT rRgnRect; /* Rectangle that defines the region */
L_INT XDst; /* Column offset of the destination */
L_INT XSize; /* Pixel width of the rectangle to combine */
L_INT YDst; /* Row offset of the destination */
L_INT YSize; /* Pixel height of the rectangle to combine */
L_INT XSrc; /* Column offset of the source */
L_INT YSrc; /* Column offset of the source */
/* Load both bitmaps, at 24 bits per pixel */
nRet = L_LoadBitmap (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.CMP"), &BitmapDst, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL);
if(nRet != SUCCESS)
return nRet;
nRet = L_LoadBitmap (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE2.CMP"), &BitmapSrc, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL);
if(nRet != SUCCESS)
return nRet;
/* Specify a position in the top left part of the displayed image */
XDst = BITMAPWIDTH(&BitmapDst) / 8;
YDst = BITMAPHEIGHT(&BitmapDst) / 8;
/* Use the half size of the source bitmap */
YSize = BITMAPHEIGHT(&BitmapSrc) / 2;
XSize = BITMAPWIDTH(&BitmapSrc) / 2;
XSrc = 0;
YSrc = 0;
// specify a rectangle
SetRect(&rRgnRect, XSrc, YSrc, XSrc + XSize , YSrc + YSize);
/* Create a rectangular region */
nRet = L_SetBitmapRgnRect (&BitmapSrc, NULL, &rRgnRect, L_RGN_SET);
if(nRet != SUCCESS)
return nRet;
/* create the fade mask */
nRet = L_CreateFadedMask(&BitmapSrc, &BitmapMask, sizeof(BITMAPHANDLE), 60, 20, 3, 0, FADE_DUMPFILL | FADE_NOTRANSPARENCY, 255,RGB(0, 0, 255));
if(nRet != SUCCESS)
return nRet;
/* Combine BitmapSrc with BitmapDst, with fade mask bitmap */
nRet = L_FeatherAlphaBlendBitmap (&BitmapDst, XDst, YDst, XSize, YSize,
& BitmapSrc, XSrc, YSrc, &BitmapMask, 0,0);
if(nRet != SUCCESS)
return nRet;
nRet = L_SaveBitmap(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\Result.BMP"), &BitmapDst, FILE_BMP, 24, 0, NULL);
if(nRet != SUCCESS)
return nRet;
/* Free the temporary bitmap */
L_FreeBitmap(&BitmapSrc);
L_FreeBitmap(&BitmapMask);
L_FreeBitmap(&BitmapDst);
return SUCCESS;
}