L_Jp2SaveMemory

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#include "l_bitmap.h"

L_LTJP2_API L_INT EXT_FUNCTION L_Jp2SaveMemory(hJp2, lpBuffer, puBufferSize, pBitmap, eFormat, nBitsPerPixel, nQFactor, pSaveOptions, pSaveCallBack, pUserData)

L_HJP2 hJp2;	/* JPEG 2000 engine handle */
L_UINT8 ** lpBuffer;	/* pointer to pointer */
L_SIZE_T *puBufferSize;	/* pointer to a variable to be updated */
pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
eJP2FILEFORMAT eFormat;	/* output file format */
L_INT nBitsPerPixel;	/* resulting files pixel depth */
L_INT nQFactor;	/* quality factor */
pSAVEFILEOPTION pSaveOptions;	/* pointer to optional extended save options */
FILESAVECALLBACK pSaveCallBack;	/* optional callback function */
L_VOID * pUserData;	/* pointer to more parameters for the callback */

Creates a file in memory in any of the supported JPEG 2000 file formats.

Parameter	Description
hJp2	JPEG 2000 engine handle that was created by the L_Jp2Create function.
lpBuffer	Pointer to a memory buffer pointer that will be updated with a new memory buffer pointer that contains the saved image. You must free this buffer by calling the Windows GlobalFree () function.
puBufferSize	Address of a variable to be updated with the size of the memory buffer in bytes.
pBitmap	Pointer to the bitmap handle that describes the data to be saved.
eFormat	Output JPEG 2000 file format.
nBitsPerPixel	Resulting files pixel depth. Possible values are: 8, 12, 16, 24, 32, 48, 64, and 0. Zero [0] means that each bitmap will be saved with its bits per pixel value, if that value is equal to one of the possible values (8, 12, 16, 24, 32, 48, or 64). If it is not one of the possible values, it will return: ERROR_J2K_UNSUPPORTED.
nQFactor	Quality factor. This value determines the degree of loss in the compression process. Possible values are from 0 to 255. Zero (0) represents lossless compression. Values between 1 and 255 are interpreted as a compression ratio.
pSaveOptions	Pointer to optional extended save options. Pass NULL to use the default save options.
pSaveCallBack	Optional callback function for additional processing. If you do not provide a callback function, pass NULL. If you provide a callback function, use the function pointer as the value of this parameter. The callback function must adhere to the syntax described in FILESAVECALLBACK.
pUserData	Void pointer you can use to pass one or more additional parameters used by the callback function. To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If additional parameters are not needed, pass NULL.

Returns

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

Comments

L_Jp2SaveMemory creates a file in memory in any of the supported JPEG 2000 file formats. All of the currently-set engines boxes will also be saved in this file.

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_Jp2ReadList, L_Jp2ReadComposite, L_Jp2ReadFrames, L_Jp2Save, L_Jp2SaveList, L_Jp2SaveComposite, L_Jp2AppendFrames, L_Jp2ReadMemory, L_Jp2ReadListMemory, L_Jp2ReadCompositeMemory, L_Jp2ReadFramesMemory, L_Jp2SaveListMemory, L_Jp2SaveCompositeMemory, L_Jp2AppendFramesMemory, L_SaveBitmapList
Topics:	Programming with JPEG 2000 Features
`	Programming with JPX Features
	Raster Image Functions: Working with JPEG 2000
	Raster Image Functions: Working with JPX

Example

This example saves/loads bitmap in JPEG 2000 file format

L_LTJP2TEX_API L_INT Jp2SaveMemoryExample(pBITMAPHANDLE pBitmap, L_UINT8 * pXMLData, L_SIZE_T uSize)
{
   L_HJP2 hEngine;
   L_INT  nRet;
   L_JP2_XML_BOX XMLBox;
   L_UINT8* pFileBuffer;
   L_SIZE_T uFileSize;

   /*Create JPEG  2000 engine handle*/
   hEngine = L_Jp2Create();

   /*Create an XML box*/
   XMLBox.uStructSize = sizeof(L_JP2_XML_BOX);
   XMLBox.pData = pXMLData;
   XMLBox.uDataSize = uSize;
   /*Set XML box of JPX engine*/
   L_Jp2SetBoxes(hEngine,L_JPXB_XML,&XMLBox,1);
   /*Save the image in JPx format*/
   nRet = L_Jp2SaveMemory(hEngine, &pFileBuffer, &uFileSize, pBitmap,LEADJP2_JPX, 24, 5,NULL, NULL, NULL);
   if(nRet != SUCCESS)
      return nRet;

   L_FreeBitmap(pBitmap);
   /*Load the saved image*/
   nRet = L_Jp2ReadMemory(hEngine,pFileBuffer, uFileSize,pBitmap,0,ORDER_BGR,NULL, NULL, NULL, NULL);
   if(nRet != SUCCESS)
      return nRet;

   /*Destroy engine handle*/
   L_Jp2Destroy(hEngine);
   GlobalFree(pFileBuffer);
   return SUCCESS;
}