In This Topic ▼

LJp2FileFormat::Read

#include "ltwrappr.h"

L_INT LJp2FileFormat::Read(pszFile, pBitmap, nBitsPerPixel, nOrder, pLoadOptions, pFileInfo, pReadCallBack, pUserData)

Loads a JPEG 2000 file.

Parameters

L_TCHAR * pszFile

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

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap to be filled with image data.

L_INT nBitsPerPixel

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

L_INT 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/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.

pLOADFILEOPTION pLoadOptions

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

pFILEINFO pFileInfo

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

LFile::LoadFileCallBack 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 LFile::LoadFileCallBack function.

L_VOID * pUserData

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

Returns

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

Comments

LJp2FileFormat::Read loads a JPEG 2000 file. If the file contains multiple images only the first image is returned. To load all images use either LJp2FileFormat::ReadListMemory or LJp2FileFormat::ReadCompositeMemory functions. To load a specific frame or frames, use the LJp2FileFormat::ReadFramesMemory function. pLoadOptions is used for loading code streams such as J2K code streams. If any of the layers has opacity channels, it will be applied on the list bitmap unless the ELO_COLOR_COMPONENT_ONLY flag is set in pLoadOptions. All engine 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.