LJp2FileFormat::ReadComposite

#include "ltwrappr.h"

L_INT LJp2FileFormat::ReadComposite(pszFile, pComposite, nBitsPerPixel, nOrder, pLoadOptions, pFileInfo, pReadCallBack, pUserData)

L_TCHAR * pszFile;

/* JPEG 2000 file name */

pL_JP2_JPXCOMPOSITE pComposite;

/* pointer to a L_JP2_JPXCOMPOSITE structure */

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 */

LFile::LoadFileCallBack pReadCallBack;

/* optional callback function */

L_VOID * pUserData;

/* pointer to more parameters for the callback */

Loads all frames bitmaps stored in the specified JPEG 2000 file (Color, Opacity and Pre-multiplied opacity).

Parameter

Description

pszFile

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

pComposite

Pointer to the L_JP2_JPXCOMPOSITE structure that references L_JP2_JPXBITMAPS bitmaps to be filled with image data.

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/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 LFile::LoadFileCallBack 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

LJp2FileFormat::ReadComposite loads all frames bitmaps stored in the specified JPEG 2000 file (Color, Opacity and Pre-multiplied opacity). You must free this structure by calling the LJp2FileFormat::FreeComposite function. Also you must free structure bitmaps by calling the LBitmapBase::Free function. 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:

LJp2FileFormat::Read, LJp2FileFormat::ReadList, LJp2FileFormat::ReadFrames, LJp2FileFormat::Save, LJp2FileFormat::SaveList, LJp2FileFormat::SaveComposite, LJp2FileFormat::AppendFrames

Topics:

Implementing JPEG 2000 Features

 

Raster Image Functions: Working with JPEG 2000

 

Programming with JPX Features

 

JPX File Comments

 

Raster Image Functions: Working with JPX

Example

For an example, refer to LJp2FileFormat::SaveComposite.