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src/Source/FreeImageToolkit/JPEGTransform.cpp  view on Meta::CPAN

// ==========================================================
// JPEG lossless transformations
//
// Design and implementation by
// - Petr Pytelka (pyta@lightcomp.com)
// - Hervé Drolon (drolon@infonie.fr)
// - Mihail Naydenov (mnaydenov@users.sourceforge.net)
//
// This file is part of FreeImage 3
//
// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
// THIS DISCLAIMER.
//
// Use at your own risk!
// ==========================================================

extern "C" {
#define XMD_H
#undef FAR
#include <setjmp.h>

#include "../LibJPEG/jinclude.h"
#include "../LibJPEG/jpeglib.h"
#include "../LibJPEG/jerror.h"
#include "../LibJPEG/transupp.h"
}

#include "FreeImage.h"
#include "Utilities.h"
#include "FreeImageIO.h"

// ----------------------------------------------------------
//   Source manager & Destination manager setup
//   (see PluginJPEG.cpp)
// ----------------------------------------------------------

void jpeg_freeimage_src(j_decompress_ptr cinfo, fi_handle infile, FreeImageIO *io);
void jpeg_freeimage_dst(j_compress_ptr cinfo, fi_handle outfile, FreeImageIO *io);

// ----------------------------------------------------------
//   Error handling
//   (see also PluginJPEG.cpp)
// ----------------------------------------------------------

/**
	Receives control for a fatal error.  Information sufficient to
	generate the error message has been stored in cinfo->err; call
	output_message to display it.  Control must NOT return to the caller;
	generally this routine will exit() or longjmp() somewhere.
*/
METHODDEF(void)
ls_jpeg_error_exit (j_common_ptr cinfo) {
	// always display the message
	(*cinfo->err->output_message)(cinfo);

	// allow JPEG with a premature end of file
	if((cinfo)->err->msg_parm.i[0] != 13) {

		// let the memory manager delete any temp files before we die
		jpeg_destroy(cinfo);

		throw FIF_JPEG;
	}
}

/**
	Actual output of any JPEG message.  Note that this method does not know
	how to generate a message, only where to send it.
*/
METHODDEF(void)
ls_jpeg_output_message (j_common_ptr cinfo) {
	char buffer[JMSG_LENGTH_MAX];

	// create the message
	(*cinfo->err->format_message)(cinfo, buffer);
	// send it to user's message proc
	FreeImage_OutputMessageProc(FIF_JPEG, buffer);
}

// ----------------------------------------------------------
//   Main program
// ----------------------------------------------------------

/**
Build a crop string. 

@param crop Output crop string
@param left Specifies the left position of the cropped rectangle
@param top Specifies the top position of the cropped rectangle
@param right Specifies the right position of the cropped rectangle
@param bottom Specifies the bottom position of the cropped rectangle
@param width Image width
@param height Image height
@return Returns TRUE if successful, returns FALSE otherwise
*/
static BOOL
getCropString(char* crop, int* left, int* top, int* right, int* bottom, int width, int height) {
	if(!left || !top || !right || !bottom) {