L_AntiAliasBitmap
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_AntiAliasBitmap(pBitmap, uThreshold, uDim, uFilter)
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pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
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L_UINT uThreshold; |
/* threshold value */ |
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L_UINT uDim; |
/* mask size */ |
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L_UINT uFilter; |
/* anti-aliasing filter */ |
Applies an anti-aliasing filter to the specified bitmap.
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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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uThreshold |
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. |
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uFilter |
Flag that indicates the type of anti-aliasing filter to use. Possible values are: |
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Value |
Meaning |
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ANTIALIAS_1 |
[0x0000] Anti-alias the bitmap vertically and horizontally. |
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ANTIALIAS_2 |
[0x0001] Anti-alias the bitmap in all directions. |
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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. |
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ANTIALIAS_DIAG |
[0x0003] Anti-alias the bitmap diagonally. |
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ANTIALIAS_HORZ |
[0x0004] Anti-alias the bitmap horizontally. |
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ANTIALIAS_VERT |
[0x0005] Anti-alias the bitmap vertically. |
Returns
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SUCCESS |
The function was successful. |
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< 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 bitmaps is from 0 to 65535 and for 12-bit bitmaps the threshold range is from 0 to 4095. Otherwise, it is from 0 to 255. The threshold is applied on channels separately.
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.
Required DLLs and Libraries
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LTANN 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 95 / 98 / Me, Windows 2000 / XP.
See Also
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Functions: |
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Topics: |
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Example
/* This example loads a bitmap and does anti-aliasing on it*/
BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */
/* Load the bitmap, keeping the bits per pixel of the file */
L_LoadBitmap (TEXT("IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* do the anti-aliasing on the bitmap */
L_AntiAliasBitmap (&LeadBitmap, 128, 3, ANTIALIAS_1);