L_Jp2SaveCompositeMemory
#include "l_bitmap.h"
L_LTJP2_API L_INT
EXT_FUNCTION L_Jp2SaveCompositeMemory(hJp2, lpBuffer, puBufferSize, pComposite,
eFormat, nBitsPerPixel, nQFactor, pSaveOptions, pSaveCallBack, pUserData)
Creates a file in memory in any of the supported JPEG 2000 file formats,
using the layer information you provide in pComposite.
This
function is available in the Document/Medical
Toolkits.
|
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. |
|
pComposite |
Pointer to the L_JP2_JPXCOMPOSITE structure that provides information
(color, opacity, pre-opacity, and compression) for all layers 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_Jp2SaveCompositeMemory creates
a file in memory in any of the supported JPEG 2000 file formats, using
the layer information you provide in pComposite.
The color bitmap must be allocated in all layers. If any color bitmap
is not allocated, the function will return: ERROR_NO_BITMAP. All of the
engines boxes will be reset. The JPEG 2000 part 1 (JP2) file format supports
only one layer. If you set more than one layer in pComposite,
only the first layer will be saved. Also, the JPEG 2000 part 1 (JP2) file
format does not support multiple codestreams, so only the color bitmap
will be saved. All of the currently-set engines boxes will also be saved
in this file.
Required DLLs and Libraries
Platforms
Windows 2000 / XP/Vista.
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_Jp2SaveMemory, L_Jp2SaveListMemory, L_Jp2AppendFramesMemory, L_SaveBitmapList |
|
Topics: |
Programming
with JPEG 2000 Features
Raster Image Functions: Working with JPEG 2000 |
Example
This example saves/loads composite bitmaps in JPEG 2000 file format
L_LTJP2TEX_API L_INT Jp2SaveCompositeMemoryExample(pL_JP2_JPXCOMPOSITE pComposite, L_UINT8 * pXMLData, L_SIZE_T uSize)
{
L_HJP2 hEngine;
L_INT nRet;
L_UINT i;
L_JP2_XML_BOX XMLBox;
L_UINT8* pFileBuffer;
L_SIZE_T uFileSize;
L_JP2_JPXCOMPOSITE Composite = {0};
/*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_Jp2SaveCompositeMemory(hEngine, &pFileBuffer, &uFileSize, pComposite,LEADJP2_JPX, 24, 5,NULL, NULL, NULL);
if(nRet != SUCCESS)
return nRet;
Composite.uStructSize = sizeof(L_JP2_JPXCOMPOSITE);
/*Load the compiste images*/
nRet = L_Jp2ReadCompositeMemory(hEngine, pFileBuffer, uFileSize, &Composite,0,ORDER_BGR,NULL, NULL, NULL, NULL);
if(nRet != SUCCESS)
return nRet;
/*Free the read composite bitmaps*/
for(i = 0; i < Composite.uNumOfBitmaps; i++)
{
if(Composite.pBitmaps[i].ColorBitmap.Flags.Allocated)
L_FreeBitmap(&Composite.pBitmaps[i].ColorBitmap);
if(Composite.pBitmaps[i].OpacityBitmap.Flags.Allocated)
L_FreeBitmap(&Composite.pBitmaps[i].OpacityBitmap);
if(Composite.pBitmaps[i].PreOpacityBitmap.Flags.Allocated)
L_FreeBitmap(&Composite.pBitmaps[i].PreOpacityBitmap);
}
/*Free composite structure*/
L_Jp2FreeComposite(hEngine, &Composite);
/*Destroy engine handle*/
L_Jp2Destroy(hEngine);
GlobalFree(pFileBuffer);
return SUCCESS;
}