--- /dev/null
+/*=========================================================================
+
+ Program: gdcm
+ Module: $RCSfile: gdcmJpeg.cxx,v $
+ Language: C++
+ Date: $Date: 2004/10/14 22:16:33 $
+ Version: $Revision: 1.25 $
+
+ Copyright (c) CREATIS (Centre de Recherche et d'Applications en Traitement de
+ l'Image). All rights reserved. See Doc/License.txt or
+ http://www.creatis.insa-lyon.fr/Public/Gdcm/License.html for details.
+
+ This software is distributed WITHOUT ANY WARRANTY; without even
+ the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ PURPOSE. See the above copyright notices for more information.
+
+=========================================================================*/
+#include "gdcmFile.h"
+
+/*
+DICOM provides a mechanism for supporting the use of JPEG Image Compression
+through the Encapsulated Format (see PS 3.3 of the DICOM Standard).
+Annex A defines a number of Transfer Syntaxes which reference
+the JPEG Standard and provide a number of lossless (bit preserving)
+and lossy compression schemes.
+In order to facilitate interoperability of implementations conforming
+to the DICOM Standard which elect to use one or more
+of the Transfer Syntaxes for JPEG Image Compression, the following policy is specified:
+
+ Any implementation which conforms to the DICOM Standard and has elected
+ to support any one of the Transfer Syntaxes for lossless JPEG Image Compression,
+ shall support the following lossless compression:
+ The subset (first-order horizontal prediction [Selection Value 1) of JPEG Process 14
+ (DPCM, non-hierarchical with Huffman coding) (see Annex F of the DICOM Standard).
+
+ Any implementation which conforms to the DICOM Standard and has elected
+ to support any one of the Transfer Syntaxes for 8-bit lossy JPEG Image Compression,
+ shall support the JPEG Baseline Compression (coding Process 1).
+
+ Any implementation which conforms to the DICOM Standard and has elected
+ to support any one of the Transfer Syntaxes for 12-bit lossy JPEG Image Compression,
+ shall support the JPEG Compression Process 4.
+
+Note: The DICOM conformance statement shall differentiate between implementations
+that can simply receive JPEG encoded images and those that can receive and process
+JPEG encoded images (see PS 3.2 of the DICOM Standard).
+
+The use of the DICOM Encapsulated Format to support JPEG Compressed Pixel Data
+implies that the Data Elements which are related to the Native Format Pixel Data encoding
+(e.g. Bits Allocated, Bits Stored, High Bit, Pixel Representation, Rows, Columns, etc.)
+shall contain values which are consistent with the characteristics
+of the uncompressed pixel data from which the compressed Data Stream was derived.
+The Pixel Data characteristics included in the JPEG Interchange Format
+shall be used to decode the compressed data stream.
+
+Run Length Encoding Compression
+
+DICOM provides a mechanism for supporting the use of Run Length Encoding (RLE)
+Compression which is a byte oriented lossless compression scheme through
+the encapsulated Format (see PS 3.3 of this Standard).
+Annex G of the DICOM Standard defines RLE Compression and its Transfer Syntax.
+
+Note: The RLE Compression algorithm described in Annex G
+of the DICOM Standard is the compression used in
+the TIFF 6.0 specification known as the "PackBits" scheme.
+
+The use of the DICOM Encapsulated Format to support RLE Compressed Pixel Data
+implies that the Data Elements which are related to the Native Format Pixel Data encoding (
+e.g. Bits Allocated, Bits Stored, High Bit, Pixel Representation, Rows, Columns, etc.)
+shall contain values which are consistent with the characteristics
+of the uncompressed pixel data from which the compressed data is derived
+*/
+
+/*
+ * <setjmp.h> is used for the optional error recovery mechanism shown in
+ * the second part of the example.
+ */
+
+/*
+ * Include file for users of JPEG library.
+ * You will need to have included system headers that define at least
+ * the typedefs FILE and size_t before you can include jpeglib.h.
+ * (stdio.h is sufficient on ANSI-conforming systems.)
+ * You may also wish to include "jerror.h".
+ */
+
+#include <setjmp.h>
+
+namespace gdcm
+{
+
+/******************** JPEG COMPRESSION SAMPLE INTERFACE *******************/
+
+/* This half of the example shows how to feed data into the JPEG compressor.
+ * We present a minimal version that does not worry about refinements such
+ * as error recovery (the JPEG code will just exit() if it gets an error).
+ */
+
+/*
+ * IMAGE DATA FORMATS:
+ *
+ * The standard input image format is a rectangular array of pixels, with
+ * each pixel having the same number of "component" values (color channels).
+ * Each pixel row is an array of JSAMPLEs (which typically are unsigned chars).
+ * If you are working with color data, then the color values for each pixel
+ * must be adjacent in the row; for example, R,G,B,R,G,B,R,G,B,... for 24-bit
+ * RGB color.
+ *
+ * For this example, we'll assume that this data structure matches the way
+ * our application has stored the image in memory, so we can just pass a
+ * pointer to our image buffer. In particular, let's say that the image is
+ * RGB color and is described by:
+ */
+
+
+//extern JSAMPLE * image_buffer; /* Points to large array of R,G,B-order data */
+//extern int image_height; /* Number of rows in image */
+//extern int image_width; /* Number of columns in image */
+
+
+
+/*
+ * Sample routine for JPEG compression. We assume that the target file name
+ * and a compression quality factor are passed in.
+ */
+
+ /**
+ * \ingroup File
+ * \brief routine for JPEG decompression
+ * @param fp pointer to an already open file descriptor
+ * 8 significant bits per pixel
+ * @param im_buf Points to array (of R,G,B-order) data to compress
+ * @param quality compression quality
+ * @param image_height Number of rows in image
+ * @param image_width Number of columns in image
+ * @return 1 on success, 0 on error
+ */
+
+bool gdcm_write_JPEG_file (FILE* fp, void* im_buf,
+ int image_width, int image_height, int quality)
+{
+
+ JSAMPLE* image_buffer = (JSAMPLE*) im_buf;
+
+ /* This struct contains the JPEG compression parameters and pointers to
+ * working space (which is allocated as needed by the JPEG library).
+ * It is possible to have several such structures, representing multiple
+ * compression/decompression processes, in existence at once. We refer
+ * to any one struct (and its associated working data) as a "JPEG object".
+ */
+ struct jpeg_compress_struct cinfo;
+ /* This struct represents a JPEG error handler. It is declared separately
+ * because applications often want to supply a specialized error handler
+ * (see the second half of this file for an example). But here we just
+ * take the easy way out and use the standard error handler, which will
+ * print a message on stderr and call exit() if compression fails.
+ * Note that this struct must live as long as the main JPEG parameter
+ * struct, to avoid dangling-pointer problems.
+ */
+ struct jpeg_error_mgr jerr;
+ /* More stuff */
+ //FILE* outfile; /* target FILE* /
+ JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
+ int row_stride; /* physical row width in image buffer */
+
+ /* Step 1: allocate and initialize JPEG compression object */
+
+ /* We have to set up the error handler first, in case the initialization
+ * step fails. (Unlikely, but it could happen if you are out of memory.)
+ * This routine fills in the contents of struct jerr, and returns jerr's
+ * address which we place into the link field in cinfo.
+ */
+ cinfo.err = jpeg_std_error(&jerr);
+ /* Now we can initialize the JPEG compression object. */
+ jpeg_create_compress(&cinfo);
+
+ /* Step 2: specify data destination (eg, a file) */
+ /* Note: steps 2 and 3 can be done in either order. */
+
+ /* Here we use the library-supplied code to send compressed data to a
+ * stdio stream. You can also write your own code to do something else.
+ * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
+ * requires it in order to write binary files.
+ */
+ // if ((outfile = fopen(filename, "wb")) == NULL) {
+ // fprintf(stderr, "can't open %s\n", filename);
+ // exit(1);
+ //
+ // }
+ jpeg_stdio_dest(&cinfo, fp);
+
+ /* Step 3: set parameters for compression */
+
+ /* First we supply a description of the input image.
+ * Four fields of the cinfo struct must be filled in:
+ */
+ cinfo.image_width = image_width;/* image width and height, in pixels */
+ cinfo.image_height = image_height;
+ cinfo.input_components = 3; /* # of color components per pixel */
+ cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
+ /* Now use the library's routine to set default compression parameters.
+ * (You must set at least cinfo.in_color_space before calling this,
+ * since the defaults depend on the source color space.)
+ */
+ jpeg_set_defaults(&cinfo);
+ /* Now you can set any non-default parameters you wish to.
+ * Here we just illustrate the use of quality (quantization table) scaling:
+ */
+ jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
+
+ /* Step 4: Start compressor */
+
+ /* TRUE ensures that we will write a complete interchange-JPEG file.
+ * Pass TRUE unless you are very sure of what you're doing.
+ */
+ jpeg_start_compress(&cinfo, TRUE);
+
+ /* Step 5: while (scan lines remain to be written) */
+ /* jpeg_write_scanlines(...); */
+
+ /* Here we use the library's state variable cinfo.next_scanline as the
+ * loop counter, so that we don't have to keep track ourselves.
+ * To keep things simple, we pass one scanline per call; you can pass
+ * more if you wish, though.
+ */
+ row_stride = image_width * 3;/* JSAMPLEs per row in image_buffer */
+
+ while (cinfo.next_scanline < cinfo.image_height) {
+ /* jpeg_write_scanlines expects an array of pointers to scanlines.
+ * Here the array is only one element long, but you could pass
+ * more than one scanline at a time if that's more convenient.
+ */
+ row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
+
+ (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
+ }
+
+ /* Step 6: Finish compression */
+
+ jpeg_finish_compress(&cinfo);
+
+ /* After finish_compress, we can close the output file. */
+
+ // fclose(fp); --> the caller will close (multiframe treatement)
+
+ /* Step 7: release JPEG compression object */
+
+ /* This is an important step since it will release a good deal of memory. */
+ jpeg_destroy_compress(&cinfo);
+
+ /* And we're done! */
+
+ return true; //???
+}
+
+
+
+/*
+ * SOME FINE POINTS:
+ *
+ * In the above loop, we ignored the return value of jpeg_write_scanlines,
+ * which is the number of scanlines actually written. We could get away
+ * with this because we were only relying on the value of cinfo.next_scanline,
+ * which will be incremented correctly. If you maintain additional loop
+ * variables then you should be careful to increment them properly.
+ * Actually, for output to a stdio stream you needn't worry, because
+ * then jpeg_write_scanlines will write all the lines passed (or else exit
+ * with a fatal error). Partial writes can only occur if you use a data
+ * destination module that can demand suspension of the compressor.
+ * (If you don't know what that's for, you don't need it.)
+ *
+ * If the compressor requires full-image buffers (for entropy-coding
+ * optimization or a multi-scan JPEG file), it will create temporary
+ * files for anything that doesn't fit within the maximum-memory setting.
+ * (Note that temp files are NOT needed if you use the default parameters.)
+ * On some systems you may need to set up a signal handler to ensure that
+ * temporary files are deleted if the program is interrupted. See libjpeg.doc.
+ *
+ * Scanlines MUST be supplied in top-to-bottom order if you want your JPEG
+ * files to be compatible with everyone else's. If you cannot readily read
+ * your data in that order, you'll need an intermediate array to hold the
+ * image. See rdtarga.c or rdbmp.c for examples of handling bottom-to-top
+ * source data using the JPEG code's internal virtual-array mechanisms.
+ */
+
+
+
+/******************** JPEG DECOMPRESSION SAMPLE INTERFACE *******************/
+
+/* This half of the example shows how to read data from the JPEG decompressor.
+ * It's a bit more refined than the above, in that we show:
+ * (a) how to modify the JPEG library's standard error-reporting behavior;
+ * (b) how to allocate workspace using the library's memory manager.
+ *
+ * Just to make this example a little different from the first one, we'll
+ * assume that we do not intend to put the whole image into an in-memory
+ * buffer, but to send it line-by-line someplace else. We need a one-
+ * scanline-high JSAMPLE array as a work buffer, and we will let the JPEG
+ * memory manager allocate it for us. This approach is actually quite useful
+ * because we don't need to remember to deallocate the buffer separately: it
+ * will go away automatically when the JPEG object is cleaned up.
+ */
+
+/*
+ * ERROR HANDLING:
+ *
+ * The JPEG library's standard error handler (jerror.c) is divided into
+ * several "methods" which you can override individually. This lets you
+ * adjust the behavior without duplicating a lot of code, which you might
+ * have to update with each future release.
+ *
+ * Our example here shows how to override the "error_exit" method so that
+ * control is returned to the library's caller when a fatal error occurs,
+ * rather than calling exit() as the standard error_exit method does.
+ *
+ * We use C's setjmp/longjmp facility to return control. This means that the
+ * routine which calls the JPEG library must first execute a setjmp() call to
+ * establish the return point. We want the replacement error_exit to do a
+ * longjmp(). But we need to make the setjmp buffer accessible to the
+ * error_exit routine. To do this, we make a private extension of the
+ * standard JPEG error handler object. (If we were using C++, we'd say we
+ * were making a subclass of the regular error handler.)
+ *
+ * Here's the extended error handler struct:
+ */
+
+//-----------------------------------------------------------------------------
+struct my_error_mgr {
+ struct jpeg_error_mgr pub; /* "public" fields */
+ jmp_buf setjmp_buffer; /* for return to caller */
+};
+
+//-----------------------------------------------------------------------------
+typedef struct my_error_mgr* my_error_ptr;
+
+/*
+ * Here's the routine that will replace the standard error_exit method:
+ */
+METHODDEF(void) my_error_exit (j_common_ptr cinfo) {
+ /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
+ my_error_ptr myerr = (my_error_ptr) cinfo->err;
+
+ /* Always display the message. */
+ /* We could postpone this until after returning, if we chose. */
+ (*cinfo->err->output_message) (cinfo);
+
+ /* Return control to the setjmp point */
+ longjmp(myerr->setjmp_buffer, 1);
+}
+
+//-----------------------------------------------------------------------------
+/*
+ * Sample routine for JPEG decompression. We assume that the source file name
+ * is passed in. We want to return 1 on success, 0 on error.
+ */
+
+ /**
+ * \brief routine for JPEG decompression
+ * @param fp pointer to an already open file descriptor
+ * 8 significant bits per pixel
+ * @param image_buffer to receive uncompressed pixels
+ * @return 1 on success, 0 on error
+ */
+
+bool gdcm_read_JPEG_file ( FILE* fp, void* image_buffer )
+{
+ char* pimage;
+
+ /* This struct contains the JPEG decompression parameters and pointers to
+ * working space (which is allocated as needed by the JPEG library).
+ */
+ struct jpeg_decompress_struct cinfo;
+
+ /* -------------- inside, we found :
+ * JDIMENSION image_width; // input image width
+ * JDIMENSION image_height; // input image height
+ * int input_components; // nb of color components in input image
+ * J_COLOR_SPACE in_color_space; // colorspace of input image
+ * double input_gamma; // image gamma of input image
+ * -------------- */
+
+ /* We use our private extension JPEG error handler.
+ * Note that this struct must live as long as the main JPEG parameter
+ * struct, to avoid dangling-pointer problems.
+ */
+ struct my_error_mgr jerr;
+ /* More stuff */
+
+ JSAMPARRAY buffer;/* Output row buffer */
+
+ // rappel :
+ // ------
+ // typedef unsigned char JSAMPLE;
+ // typedef JSAMPLE FAR *JSAMPROW;/* ptr to one image row of pixel samples. */
+ // typedef JSAMPROW *JSAMPARRAY;/* ptr to some rows (a 2-D sample array) */
+ // typedef JSAMPARRAY *JSAMPIMAGE;/* a 3-D sample array: top index is color */
+
+ int row_stride;/* physical row width in output buffer */
+
+#ifdef GDCM_JPG_DEBUG
+ printf("entree dans File::gdcm_read_JPEG_file (i.e. 8), depuis gdcmJpeg\n");
+#endif //GDCM_JPG_DEBUG
+
+ /* In this example we want to open the input file before doing anything else,
+ * so that the setjmp() error recovery below can assume the file is open.
+ * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
+ * requires it in order to read binary files.
+ */
+
+ /* Step 1: allocate and initialize JPEG decompression object */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 1\n");
+#endif //GDCM_JPG_DEBUG
+
+ /* We set up the normal JPEG error routines, then override error_exit. */
+
+ cinfo.err = jpeg_std_error(&jerr.pub);
+ jerr.pub.error_exit = my_error_exit;
+
+ /* Establish the setjmp return context for my_error_exit to use. */
+ if (setjmp(jerr.setjmp_buffer))
+ {
+ /* If we get here, the JPEG code has signaled an error.
+ * We need to clean up the JPEG object, close the input file, and return.
+ */
+ jpeg_destroy_decompress(&cinfo);
+ return 0;
+ }
+ /* Now we can initialize the JPEG decompression object. */
+ jpeg_create_decompress(&cinfo);
+
+ /* Step 2: specify data source (eg, a file) */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 2\n");
+#endif //GDCM_JPG_DEBUG
+
+ jpeg_stdio_src(&cinfo, fp);
+
+ /* Step 3: read file parameters with jpeg_read_header() */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 3\n");
+#endif //GDCM_JPG_DEBUG
+
+ (void) jpeg_read_header(&cinfo, TRUE);
+
+ /* We can ignore the return value from jpeg_read_header since
+ * (a) suspension is not possible with the stdio data source, and
+ * (b) we passed TRUE to reject a tables-only JPEG file as an error.
+ * See libjpeg.doc for more info.
+ */
+
+ // prevent the library from performing any color space conversion
+ if( cinfo.process == JPROC_LOSSLESS )
+ {
+ cinfo.jpeg_color_space = JCS_UNKNOWN;
+ cinfo.out_color_space = JCS_UNKNOWN;
+ }
+
+
+#ifdef GDCM_JPG_DEBUG
+ printf("--------------Header contents :----------------\n");
+ printf("image_width %d image_height %d\n",
+ cinfo.image_width , cinfo.image_height);
+ printf("bits of precision in image data %d \n",
+ cinfo.output_components);
+ printf("nb of color components returned %d \n",
+ cinfo.data_precision);
+#endif //GDCM_JPG_DEBUG
+
+
+ /*
+ * JDIMENSION image_width; // input image width
+ * JDIMENSION image_height; // input image height
+ * int output_components; // # of color components returned
+ * J_COLOR_SPACE in_color_space; // colorspace of input image
+ * double input_gamma; // image gamma of input image
+ * int data_precision; // bits of precision in image data
+ */
+
+ /* Step 4: set parameters for decompression */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 4\n");
+#endif //GDCM_JPG_DEBUG
+ /* In this example, we don't need to change any of the defaults set by
+ * jpeg_read_header(), so we do nothing here.
+ */
+
+ /* Step 5: Start decompressor */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 5\n");
+#endif //GDCM_JPG_DEBUG
+
+ (void) jpeg_start_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* We may need to do some setup of our own at this point before reading
+ * the data. After jpeg_start_decompress() we have the correct scaled
+ * output image dimensions available, as well as the output colormap
+ * if we asked for color quantization.
+ * In this example, we need to make an output work buffer of the right size.
+ */
+
+ /* JSAMPLEs per row in output buffer */
+ row_stride = cinfo.output_width * cinfo.output_components;
+
+#ifdef GDCM_JPG_DEBUG
+ printf ("cinfo.output_width %d cinfo.output_components %d row_stride %d\n",
+ cinfo.output_width, cinfo.output_components,row_stride);
+#endif //GDCM_JPG_DEBUG
+
+ /* Make a one-row-high sample array that will go away when done with image */
+ buffer = (*cinfo.mem->alloc_sarray)
+ ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+
+ /* Step 6: while (scan lines remain to be read) */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 6\n");
+#endif //GDCM_JPG_DEBUG
+ /* jpeg_read_scanlines(...); */
+
+ /* Here we use the library's state variable cinfo.output_scanline as the
+ * loop counter, so that we don't have to keep track ourselves.
+ */
+#ifdef GDCM_JPG_DEBUG
+ printf ("cinfo.output_height %d cinfo.output_width %d\n",
+ cinfo.output_height,cinfo.output_width);
+#endif //GDCM_JPG_DEBUG
+ pimage=(char *)image_buffer;
+
+ int bufsize = cinfo.output_width * cinfo.output_components;
+ size_t rowsize = bufsize * sizeof(JSAMPLE);
+
+ while (cinfo.output_scanline < cinfo.output_height) {
+ /* jpeg_read_scanlines expects an array of pointers to scanlines.
+ * Here the array is only one element long, but you could ask for
+ * more than one scanline at a time if that's more convenient.
+ */
+
+ (void) jpeg_read_scanlines(&cinfo, buffer, 1);
+ memcpy( pimage, *buffer,rowsize);
+ pimage+=rowsize;
+ }
+
+
+printf( "Image size read: %d\n\n\n\n", (cinfo.output_scanline) * rowsize);
+ /* Step 7: Finish decompression */
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 7\n");
+#endif //GDCM_JPG_DEBUG
+
+ (void) jpeg_finish_decompress(&cinfo);
+
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* Step 8: Release JPEG decompression object */
+
+#ifdef GDCM_JPG_DEBUG
+ printf("Entree Step 8\n");
+#endif //GDCM_JPG_DEBUG
+
+ /* This is an important step since it will release a good deal of memory. */
+
+ jpeg_destroy_decompress(&cinfo);
+
+ /* After finish_decompress, we can close the input file.
+ * Here we postpone it until after no more JPEG errors are possible,
+ * so as to simplify the setjmp error logic above. (Actually, I don't
+ * think that jpeg_destroy can do an error exit, but why assume anything...)
+ */
+
+ /* At this point you may want to check to see whether any corrupt-data
+ * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
+ */
+
+ /* And we're done! */
+
+ return true;
+}
+
+
+/*
+ * SOME FINE POINTS:
+ *
+ * In the above code, we ignored the return value of jpeg_read_scanlines,
+ * which is the number of scanlines actually read. We could get away with
+ * this because we asked for only one line at a time and we weren't using
+ * a suspending data source. See libjpeg.doc for more info.
+ *
+ * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress();
+ * we should have done it beforehand to ensure that the space would be
+ * counted against the JPEG max_memory setting. In some systems the above
+ * code would risk an out-of-memory error. However, in general we don't
+ * know the output image dimensions before jpeg_start_decompress(), unless we
+ * call jpeg_calc_output_dimensions(). See libjpeg.doc for more about this.
+ *
+ * Scanlines are returned in the same order as they appear in the JPEG file,
+ * which is standardly top-to-bottom. If you must emit data bottom-to-top,
+ * you can use one of the virtual arrays provided by the JPEG memory manager
+ * to invert the data. See wrbmp.c for an example.
+ *
+ * As with compression, some operating modes may require temporary files.
+ * On some systems you may need to set up a signal handler to ensure that
+ * temporary files are deleted if the program is interrupted. See libjpeg.doc.
+ */
+
+//----------------------------------------------------------------------------
+
+} // end namespace gdcm
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