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Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
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Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
L_HalfToneBitmap
#include "l_bitmap.h"
L_LTIMGCOR_API L_INT L_HalfToneBitmap(pBitmap, uType, nAngle, uDim, hList, uFlags)
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pBITMAPHANDLE pBitmap; |
/* Pointer to the bitmap handle */ |
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L_UINT uType; |
/* Type of halftoning to do */ |
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L_INT32 nAngle; |
/* Angle of rotation */ |
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L_UINT uDim; |
/* Size of the grain */ |
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HBITMAPLIST hList; |
/* Handle to the list of bitmaps */ |
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L_UINT32 uFlags; |
/* flags*/ |
Converts a 1-, 4-, 8-, 16-, 24-, or 32-bit bitmap to a halftoned bitmap, with a specified pattern rotation. A halftoned bitmap is a 1-bit bitmap that has been dithered for black and white printing or display.
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Parameter |
Description |
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pBitmap |
Pointer to the bitmap handle referencing the bitmap to be converted. |
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uType |
Value that indicates the type of halftoning to perform. Possible values are: |
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Value |
Meaning |
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HT_PRINT |
[0x0000] Halftone for printing |
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HT_VIEW |
[0x0001] Halftone for display |
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HT_RECT |
[0x0002] Rectangular halftone |
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HT_CIRC |
[0x0003] Circular halftone |
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HT_ELLIPS |
[0x0004] Elliptical halftone |
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HT_RAND |
[0x0005] Random halftone |
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HT_LINEAR |
[0x0006] Linear halftone |
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HT_USERDEF |
[0x0007] User defined halftone |
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nAngle |
The angle of rotation, expressed in hundredths of degrees. A value of 0 produces a horizontal halftone pattern. This parameter specifies the number of degrees to change the pattern. Positive values rotate the pattern clockwise; negative values rotate the pattern counterclockwise. This value is ignored if the selected halftone pattern is HT_RECT, HT_CIRC or HT_RAND or HT_USERDEF. |
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uDim |
Value that indicates the size of the grain. This value is ignored if the selected halftone pattern is HT_VIEW or HT_PRINT. If the pattern is not HT_VIEW or HT_PRINT, uDim should be >= 1. If this parameter is < 1 this function will return ERROR_INV_PARAMETER (-13). |
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hList |
Handle to the list of bitmaps that will be used in half toning if the HT_USERDEF option is selected. |
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uFlags |
Reserved for future use. Must be 0. |
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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 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.
For the HT_USERDEF option, the number of bitmaps in the list must be at least equal to (uDim * uDim + 1). Bitmaps with higher indexes correspond to higher intensity values.
This function can process the whole image or a region of the image.
This function does not support 12 and 16-bit grayscale and 48 and 64-bit color images.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
This function supports 32-bit grayscale images.
Required DLLs and Libraries
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LTIMGCOR 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
#if defined (LEADTOOLS_V16_OR_LATER)
L_INT HalfToneBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
BITMAPHANDLE TmpBitmap; /* Temporary bitmap for building the list */
HBITMAPLIST hList;
L_INT i;
/* Load a bitmap at its own bits per pixel */
nRet = L_LoadBitmap (TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\image3.cmp"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet !=SUCCESS)
return nRet;
nRet = L_CreateBitmapList(&hList);
if(nRet !=SUCCESS)
return nRet;
for (i = 0; i <= 36; ++ i)
{
nRet = L_CopyBitmap(&TmpBitmap, &LeadBitmap, sizeof(BITMAPHANDLE));
if(nRet !=SUCCESS)
return nRet;
/* Rotate, using the transparent color as the fill color */
nRet = L_RotateBitmap (&TmpBitmap, 1000 * i, 0, RGB(0,0,0));
if(nRet !=SUCCESS)
return nRet;
nRet = L_InsertBitmapListItem(hList, (L_UINT)-1, &TmpBitmap);
if(nRet !=SUCCESS)
return nRet;
}
/* fill hList by at least 26 bitmaps*/
/* Halftone the bitmap */
nRet = L_HalfToneBitmap(&LeadBitmap, HT_USERDEF,0, 5, hList, 0);
if(nRet !=SUCCESS)
return nRet;
nRet = L_DestroyBitmapList(hList);
if(nRet !=SUCCESS)
return nRet;
nRet = L_SaveBitmap(TEXT("%UserProfile%\\My Documents\\LEADTOOLS 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;
}
#else
L_INT HalfToneBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
BITMAPHANDLE TmpBitmap; /* Temporary bitmap for building the list */
HBITMAPLIST hList;
L_INT i;
/* Load a bitmap at its own bits per pixel */
nRet = L_LoadBitmap (TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\image3.cmp"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet !=SUCCESS)
return nRet;
nRet = L_CreateBitmapList(&hList);
if(nRet !=SUCCESS)
return nRet;
for (i = 0; i <= 36; ++ i)
{
nRet = L_CopyBitmap(&TmpBitmap, &LeadBitmap, sizeof(BITMAPHANDLE));
if(nRet !=SUCCESS)
return nRet;
/* Rotate, using the transparent color as the fill color */
nRet = L_RotateBitmap (&TmpBitmap, 1000 * i, 0, RGB(0,0,0));
if(nRet !=SUCCESS)
return nRet;
nRet = L_InsertBitmapListItem(hList, (L_UINT)-1, &TmpBitmap);
if(nRet !=SUCCESS)
return nRet;
}
/* fill hList by at least 26 bitmaps*/
/* Halftone the bitmap */
nRet = L_HalfToneBitmap(&LeadBitmap, HT_USERDEF,0, 5, hList);
if(nRet !=SUCCESS)
return nRet;
nRet = L_DestroyBitmapList(hList);
if(nRet !=SUCCESS)
return nRet;
nRet = L_SaveBitmap(TEXT("%UserProfile%\\My Documents\\LEADTOOLS 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;
}
#endif // LEADTOOLS_V16_OR_LATER