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LEADTOOLS Raster Imaging C DLL Help

L_Jp2ReadList

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#include "l_bitmap.h"

L_LTJP2_API L_INT EXT_FUNCTION L_Jp2ReadList(hJp2, pszFile, phList, nBitsPerPixel, nOrder, pLoadOptions, pFileInfo, pReadCallBack, pUserData)

L_HJP2 hJp2;

/* JPEG 2000 engine handle */

L_TCHAR * pszFile;

/* JPEG 2000 file name*/

pHBITMAPLIST phList;

/* address of the variable to be updated */

L_INT nBitsPerPixel;

/* resulting bitmaps pixel depth */

L_INT nOrder;

/* desired color order */

pLOADFILEOPTION pLoadOptions;

/* pointer to optional extended load options */

pFILEINFO pFileInfo;

/* pointer to a structure */

FILEREADCALLBACK pReadCallBack;

/* optional callback function */

L_VOID * pUserData;

/* pointer to more parameters for the callback */

Creates a bitmap list and loads all frames (images) stored in JPEG 2000 file.

Parameter

Description

hJp2

JPEG 2000 engine handle.

pszFile

Character string that contains the name of the JPEG 2000 file.

phList

Address of the HBITMAPLIST variable for the new list.

nBitsPerPixel

Resulting bitmap pixel depth. If zero [0], the bitmap will have the original files pixel depth (do not convert).

nOrder

The desired color order. Possible values are:

Value

Meaning

ORDER_RGB

[0] Read-green-blue order.

ORDER_BGR

[1] Blue green-red order.

ORDER_GRAY

[2] 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in Document and Medical imaging products only.

0

The data is 8 bits per pixel or less.

ORDER_RGBORGRAY

[3] Load the image as red, green, blue, OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in Document/Medical imaging products only.

ORDER_BGRORGRAY

[4] Load the image as blue, green, red, OR as a 12 or 16-bit grayscale image. 12 and 16-bit grayscale images are supported in Document/Medical imaging products only.

ORDER_ROMM

[5] ROMM order. ROMM only supports 24 and 48-bit images.

ORDER_BGRORGRAYORROMM

[6] Load the image as blue, green, red, OR as a 12 or 16-bit grayscale image OR as ROMM. 12 and 16-bit grayscale images are supported in Document/Medical imaging products only.

pLoadOptions

Pointer to optional extended load options. Pass NULL to use the default load options.

pFileInfo

Pointer to a FILEINFO structure. If nothing is known about the file pass NULL.

pReadCallBack

Optional callback function for additional processing.

If you do not provide a callback function, pass NULL.

If you do provide a callback function, use the function pointer as the value of this parameter.

The callback function must adhere to the function prototype described in the FILEREADCALLBACK function.

pUserData

Void pointer that you can use to pass one or more additional parameters used by the callback function.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

L_Jp2ReadList creates a bitmap list and loads all frames (images) stored in JPEG 2000 file in memory. If any of the layers has opacity channels it will be applied on the list bitmap unless ELO_COLOR_COMPONENT_ONLY flag is set in pLoadOptions. All of the engines boxes will be reset and updated with the new loaded boxes only.

Required DLLs and Libraries

LTJP2
LFJ2K
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

Win32, x64.

See Also

Functions:

L_Jp2Read, L_Jp2ReadComposite, L_Jp2ReadFrames, L_Jp2Save, L_Jp2SaveList, L_Jp2SaveComposite, L_Jp2AppendFrames, L_Jp2ReadMemory, L_Jp2ReadListMemory, L_Jp2ReadCompositeMemory, L_Jp2ReadFramesMemory, L_Jp2SaveMemory, L_Jp2SaveListMemory, L_Jp2SaveCompositeMemory, L_Jp2AppendFramesMemory

Topics:

Programming with JPEG 2000 Features

`

Programming with JPX Features

 

Raster Image Functions: Working with JPEG 2000

 

Raster Image Functions: Working with JPX

Example

For an example, refer to L_Jp2SaveList.

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