INVERTEDTEXTCALLBACK

#include "l_bitmap.h"

L_INT pEXT_CALLBACK YourFunction(hRgn, pBoundingRect, iWhiteCount, iBlackCount, pUserData)

HRGN hRgn;

windows region

PRECT pBoundingRect;

pointer to a RECT structure

L_INT iWhiteCount;

number of white pixels

L_INT iBlackCount;

number of black pixels

L_VOID *pUserData;

pointer to additional parameters

Handles each inverted text segment found by L_InvertedTextBitmap.

Parameter

Description

hRgn

Windows region representing the inverted text to be removed. It is the programmers responsibility to delete this region (using DeleteObject()) when it is no longer needed.

pBoundingRect

Pointer to a RECT structure that contains the bounding rectangle of the inverted text region being processed.

iWhiteCount

Total number of white pixels in the inverted text region being processed.

iBlackCount

Total number of black pixels in the inverted text region being processed.

pUserData

A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of L_InvertedTextBitmap.)

 

Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.

Returns

SUCCESS_REMOVE

Invert the text.

SUCCESS_NOREMOVE

Do not invert the text.

Otherwise

An error occurred. Refer to Return Codes.

Comments

The callback is called once for each area of inverted text that is detected. Return SUCCESS_REMOVE to have the area modified. Return SUCCESS_NOREMOVE to leave the area unchanged. Pass any other value to abort. This value will be the return value of the L_InvertedTextBitmap() . If flags INVERTEDTEXT_IMAGE_UNCHANGED and INVERTEDTEXT _SINGLE_REGION are being used, then the return value of the callback affects only the internal single region that contains all the changes.

Required DLLs and Libraries

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.

See Also

Functions:

L_InvertedTextBitmap

Topics:

Cleaning Up 1-Bit Images

Example

For an example, refer to L_InvertedTextBitmap.

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