ossimJpegMemDest.cpp File Reference

#include <ossim/imaging/ossimJpegMemDest.h>
#include <cstdlib>
#include <cstdio>
#include <csetjmp>
#include <ostream>
#include <jpeglib.h>

Go to the source code of this file.

Classes
struct	cpp_dest_mgr
	for jmp_buf More...

Macros
#define	OUTPUT_BUF_SIZE   4096 /* choose an efficiently fwrite'able size */

Functions
void	init_destination (j_compress_ptr cinfo)
boolean	empty_output_buffer (j_compress_ptr cinfo)
void	term_destination (j_compress_ptr cinfo)
void	jpeg_cpp_stream_dest (jpeg_compress_struct *cinfo, std::ostream &stream)
	Method which uses memory instead of a FILE* to write to. More...

Macro Definition Documentation

OUTPUT_BUF_SIZE

#define OUTPUT_BUF_SIZE   4096 /* choose an efficiently fwrite'able size */

Definition at line 29 of file ossimJpegMemDest.cpp.

Referenced by empty_output_buffer(), init_destination(), and term_destination().

Function Documentation

empty_output_buffer()

boolean empty_output_buffer

(

j_compress_ptr

cinfo

)

Definition at line 43 of file ossimJpegMemDest.cpp.

References cpp_dest_mgr::buffer, OUTPUT_BUF_SIZE, cpp_dest_mgr::pub, cpp_dest_mgr::stream, and TRUE.

Referenced by jpeg_cpp_stream_dest().

{
   cpp_dest_mgr* dest = (cpp_dest_mgr*) cinfo->dest;
   dest->stream->write ((char*)dest->buffer, OUTPUT_BUF_SIZE);

   dest->pub.next_output_byte = dest->buffer;
   dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;

   return TRUE;
}

init_destination()

void init_destination

(

j_compress_ptr

cinfo

)

Definition at line 31 of file ossimJpegMemDest.cpp.

References cpp_dest_mgr::buffer, OUTPUT_BUF_SIZE, and cpp_dest_mgr::pub.

Referenced by jpeg_cpp_stream_dest().

{
   cpp_dest_mgr* dest = (cpp_dest_mgr*) cinfo->dest;

   /* Allocate the output buffer --- it will be released when done with image */
   dest->buffer = (JOCTET *)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, OUTPUT_BUF_SIZE * sizeof(JOCTET));

   dest->pub.next_output_byte = dest->buffer;
   dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}

jpeg_cpp_stream_dest()

void jpeg_cpp_stream_dest	(	jpeg_compress_struct *	cinfo,
		std::ostream &	stream
	)

Method which uses memory instead of a FILE* to write to.

Note

Used in place of "jpeg_stdio_dest(&cinfo, outfile)".

Definition at line 69 of file ossimJpegMemDest.cpp.

References empty_output_buffer(), init_destination(), cpp_dest_mgr::pub, cpp_dest_mgr::stream, and term_destination().

Referenced by ossimJpegCodec::encode(), and ossimPdfWriter::writeJpegTile().

{
   cpp_dest_mgr* dest;

   /* first time for this JPEG object? */
   if (cinfo->dest == NULL) 
      cinfo->dest = (struct jpeg_destination_mgr *) malloc (sizeof(cpp_dest_mgr));

   dest = (cpp_dest_mgr*) cinfo->dest;
   dest->pub.init_destination = init_destination;
   dest->pub.empty_output_buffer = empty_output_buffer;
   dest->pub.term_destination = term_destination;
   dest->stream = &stream;
}

term_destination()

void term_destination

(

j_compress_ptr

cinfo

)

Definition at line 55 of file ossimJpegMemDest.cpp.

References cpp_dest_mgr::buffer, if(), OUTPUT_BUF_SIZE, cpp_dest_mgr::pub, and cpp_dest_mgr::stream.

Referenced by jpeg_cpp_stream_dest().

{
   cpp_dest_mgr* dest = (cpp_dest_mgr*) cinfo->dest;
   size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;

   /* Write any data remaining in the buffer */
   if (datacount > 0) 
      dest->stream->write ((char*)dest->buffer, datacount);

   dest->stream->flush();
   free (cinfo->dest);
}