L_DitherLine

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_DitherLine(pBitmap, pBufferSrc, pBufferDst)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_UCHAR L_FAR * pBufferSrc;	/* pointer to the input buffer */
L_UCHAR L_FAR * pBufferDst;	/* pointer to the output buffer */

Used in a loop, dithers the line in a specified input buffer, and writes it to the output buffer. You must supply the function to process data in the input buffer.

Parameter	Description
pBitmap	Pointer to the bitmap handle that has all the information about the input image. It is the same bitmap handle that is passed by the L_StartDithering function. The bitmap does not have to exist, but the information must be complete. The DitheringMethod field in the bitmap handle specifies the dithering method to be used for color reduction.
pBufferSrc	Pointer to the input buffer.
pBufferDst	Pointer to the output buffer. You must allocate space to hold the output data.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function uses the dithering method specified in the bitmap handle. Therefore, it provides better 4- or 8-bit output than the L_ConvertBuffer function.

This function uses the palette that the L_StartDithering function specifies. The output of the L_DitherLine function is made up of 1-, 4-, or 8-bit indexes to the specified palette. L_StopDithering cleans up the allocated variables and buffers. For a description of how the functions relate to each other, refer to the L_StartDithering function description.

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

LTKRN

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, Windows CE.

Functions:	L_ConvertBuffer, L_StartDithering, L_StopDithering
Topics:	Raster Image Functions: Doing Color Expansion or Reduction
	Raster Image Functions: Doing Color Space Conversions