L_Jp2ReadFrames

#include "l_bitmap.h"

L_LTJP2_API L_INT EXT_FUNCTION L_Jp2ReadFrames(hJp2, pszFile, pComposite, pFrames, uNumOfFrames, nBitsPerPixel, nOrder, pLoadOptions, pFileInfo, pReadCallBack, pUserData)

L_HJP2 hJp2;	JPEG 2000 engine handle
L_TCHAR * pszFile;	JPEG 2000 file name
pL_JP2_JPXCOMPOSITE pComposite;	pointer to a L_JP2_JPXCOMPOSITE structure
L_UINT32 * pFrames;	frames indices
L_UINT32 uNumOfFrames;	number of frames
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

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

Parameter	Description
hJp2	JPEG 2000 engine handle that was created by the L_Jp2Create function.
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.
pFrames	Frames indices. An array of unsigned integers specifies the indices of the frames to be loaded from the file.
uNumOfFrames	Number of frames to be loaded. This value specifies the size of pFrames.
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_Jp2ReadFrames loads the specified frames bitmaps (Color, Opacity and Pre-multiplied opacity) stored in the specified JPEG 2000 file. You must free this structure by calling the L_Jp2FreeComposite function. Also you must free structure bitmaps by calling the L_FreeBitmap function. All of the engines boxes will be reset.

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.

Example

This example reads specific frame in JPEG 2000 file format

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName 
L_INT Jp2ReadFramesExample(pBITMAPHANDLE pBitmap) 
{ 
   L_HJP2 hEngine; 
   L_INT  nRet; 
   L_JP2_JPXCOMPOSITE Composite = {0}; 
   L_UINT32 puFrames[1] = {0}; 
   Composite.uStructSize = sizeof(L_JP2_JPXCOMPOSITE); 
   /*Create JPEG  2000 engine handle*/ 
   hEngine = L_Jp2Create(); 
   /*Read a frame*/ 
   puFrames[0] = 0; 
   nRet = L_Jp2ReadFrames(hEngine,MAKE_IMAGE_PATH(TEXT("image1.jpx")),&Composite,puFrames,1,24,ORDER_BGR,NULL,NULL,NULL, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
   *pBitmap = Composite.pBitmaps[0].ColorBitmap; 
   /*Free comoposite structure*/ 
   L_Jp2FreeComposite(hEngine, &Composite); 
   /*Destroy engine handle*/ 
   L_Jp2Destroy(hEngine); 
   return SUCCESS; 
}

Help Version 19.0.2017.10.27

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Redistributables/Files To Be Included With Your Application

Functions:	L_Jp2Read, L_Jp2ReadList, L_Jp2ReadComposite, 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