In This Topic ▼

LJp2FileFormat::ReadCompositeMemory

#include "ltwrappr.h"

L_INT LJp2FileFormat::ReadCompositeMemory(pBuffer, uBufferSize, pComposite, nBitsPerPixel, nOrder, pLoadOptions, pFileInfo, pReadCallBack, pUserData)

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

Parameters

L_UINT8 * pBuffer

Pointer to a JPEG 2000 file in memory.

L_SIZE_T uBufferSize

Size of JPEG 2000 file in bytes.

pL_JP2_JPXCOMPOSITE pComposite

Pointer to the L_JP2_JPXCOMPOSITE structure that references L_JP2_JPXBITMAPS bitmaps 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::ReadCompositeMemory loads all frames bitmaps stored in the specified JPEG 2000 file in memory (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.