L_AntiAliasBitmap
#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_AntiAliasBitmap(pBitmap, nThreshold, uDim, uFilter)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_INT nThreshold; |
/* threshold value */ |
L_UINT uDim; |
/* mask size */ |
L_UINT uFilter; |
/* anti-aliasing filter */ |
Applies an anti-aliasing filter to the specified bitmap.
Parameter |
Description |
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pBitmap |
Pointer to the bitmap handle that references the bitmap on which to apply the filter. |
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nThreshold |
Threshold value that indicates which pixels to smooth. The application of the anti-aliasing filter on the image associates a value with each pixel. Only pixels with values above this threshold are smoothed. |
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uDim |
Value that indicates the size of the anti-aliasing mask. For example, a value of three indicates an anti-aliasing mask of 3 X 3. |
|
uFilter |
Flag that indicates the type of anti-aliasing filter to use. Possible values are: |
|
|
Value |
Meaning |
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ANTIALIAS_1 |
[0x0000] Anti-alias the bitmap vertically and horizontally. |
|
ANTIALIAS_2 |
[0x0001] Anti-alias the bitmap in all directions. |
|
ANTIALIAS_3 |
[0x0002] Anti-alias the bitmap in all directions. The filter used for this option is different from the filter used for the ANTIALIAS_2 option. |
|
ANTIALIAS_DIAG |
[0x0003] Anti-alias the bitmap diagonally. |
|
ANTIALIAS_HORZ |
[0x0004] Anti-alias the bitmap horizontally. |
|
ANTIALIAS_VERT |
[0x0005] Anti-alias the bitmap vertically. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function can process the whole image or a region of the image.
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.
The best results for anti-aliasing text can be obtained with the filter ANTIALIAS_2.
The value of the uDim parameter determines the extent of the anti-aliasing.
The threshold range for 16, 48 and 64-bit images is from 0 to 65535 for unsigned images, and from –32768 to +32767 for signed images. For 12-bit images, the threshold range is from 0 to 4095 for unsigned images, and from –2048 to +2047 for signed images. Otherwise, it is from 0 to 255. The threshold is applied to channels separately.
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
Functions: |
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Topics: |
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Example
L_INT AntiAliasBitmapExample(L_VOID) { L_INT nRet; BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */ /* Load the bitmap, keeping the bits per pixel of the file */ nRet = L_LoadBitmap (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); if(nRet !=SUCCESS) return nRet; /* do the anti-aliasing on the bitmap */ nRet = L_AntiAliasBitmap (&LeadBitmap, 128, 3, ANTIALIAS_1); if(nRet !=SUCCESS) return nRet; nRet = L_SaveBitmap(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\Result.BMP"), &LeadBitmap, FILE_BMP, 24, 0, NULL); if(nRet !=SUCCESS) return nRet; //free bitmap if(LeadBitmap.Flags.Allocated) L_FreeBitmap(&LeadBitmap); return SUCCESS; }