/*
 * wrppm.c
 *
 * Copyright (C) 1991-1996, Thomas G. Lane.
 * Modified 2009 by Guido Vollbeding.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains routines to write output images in PPM/PGM format.
 * The extended 2-byte-per-sample raw PPM/PGM formats are supported.
 * The PBMPLUS library is NOT required to compile this software
 * (but it is highly useful as a set of PPM image manipulation programs).
 *
 * These routines may need modification for non-Unix environments or
 * specialized applications.  As they stand, they assume output to
 * an ordinary stdio stream.
 */

#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */

#ifdef PPM_SUPPORTED


/*
 * For 12-bit JPEG data, we either downscale the values to 8 bits
 * (to write standard byte-per-sample PPM/PGM files), or output
 * nonstandard word-per-sample PPM/PGM files.  Downscaling is done
 * if PPM_NORAWWORD is defined (this can be done in the Makefile
 * or in jconfig.h).
 * (When the core library supports data precision reduction, a cleaner
 * implementation will be to ask for that instead.)
 */

#if BITS_IN_JSAMPLE == 8
#define PUTPPMSAMPLE(ptr,v)  *ptr++ = (char) (v)
#define BYTESPERSAMPLE 1
#define PPM_MAXVAL 255
#else
#ifdef PPM_NORAWWORD
#define PUTPPMSAMPLE(ptr,v)  *ptr++ = (char) ((v) >> (BITS_IN_JSAMPLE-8))
#define BYTESPERSAMPLE 1
#define PPM_MAXVAL 255
#else
/* The word-per-sample format always puts the MSB first. */
#define PUTPPMSAMPLE(ptr,v)			\
	{ register int val_ = v;		\
	  *ptr++ = (char) ((val_ >> 8) & 0xFF);	\
	  *ptr++ = (char) (val_ & 0xFF);	\
	}
#define BYTESPERSAMPLE 2
#define PPM_MAXVAL ((1<<BITS_IN_JSAMPLE)-1)
#endif
#endif


/*
 * When JSAMPLE is the same size as char, we can just fwrite() the
 * decompressed data to the PPM or PGM file.  On PCs, in order to make this
 * work the output buffer must be allocated in near data space, because we are
 * assuming small-data memory model wherein fwrite() can't reach far memory.
 * If you need to process very wide images on a PC, you might have to compile
 * in large-memory model, or else replace fwrite() with a putc() loop ---
 * which will be much slower.
 */


/* Private version of data destination object */
//TODO UMBAU
//typedef struct {
//  struct djpeg_dest_struct pub;	/* public fields */
//
//  /* Usually these two pointers point to the same place: */
//  char *iobuffer;		/* fwrite's I/O buffer */
//  JSAMPROW pixrow;		/* decompressor output buffer */
//  size_t buffer_width;		/* width of I/O buffer */
//  JDIMENSION samples_per_row;	/* JSAMPLEs per output row */
//} ppm_dest_struct;
//
//typedef ppm_dest_struct * ppm_dest_ptr;
//
//
///*
// * Write some pixel data.
// * In this module rows_supplied will always be 1.
// *
// * put_pixel_rows handles the "normal" 8-bit case where the decompressor
// * output buffer is physically the same as the fwrite buffer.
// */
//
//METHODDEF(void)
//put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
//		JDIMENSION rows_supplied)
//{
//  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
//
//  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
//}
//
//
///*
// * This code is used when we have to copy the data and apply a pixel
// * format translation.  Typically this only happens in 12-bit mode.
// */
//
//METHODDEF(void)
//copy_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
//		 JDIMENSION rows_supplied)
//{
//  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
//  register char * bufferptr;
//  register JSAMPROW ptr;
//  register JDIMENSION col;
//
//  ptr = dest->pub.buffer[0];
//  bufferptr = dest->iobuffer;
//  for (col = dest->samples_per_row; col > 0; col--) {
//    PUTPPMSAMPLE(bufferptr, GETJSAMPLE(*ptr++));
//  }
//  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
//}
//
//
///*
// * Write some pixel data when color quantization is in effect.
// * We have to demap the color index values to straight data.
// */
//
//METHODDEF(void)
//put_demapped_rgb (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
//		  JDIMENSION rows_supplied)
//{
//  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
//  register char * bufferptr;
//  register int pixval;
//  register JSAMPROW ptr;
//  register JSAMPROW color_map0 = cinfo->colormap[0];
//  register JSAMPROW color_map1 = cinfo->colormap[1];
//  register JSAMPROW color_map2 = cinfo->colormap[2];
//  register JDIMENSION col;
//
//  ptr = dest->pub.buffer[0];
//  bufferptr = dest->iobuffer;
//  for (col = cinfo->output_width; col > 0; col--) {
//    pixval = GETJSAMPLE(*ptr++);
//    PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map0[pixval]));
//    PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map1[pixval]));
//    PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map2[pixval]));
//  }
//  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
//}
//
//
//METHODDEF(void)
//put_demapped_gray (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo,
//		   JDIMENSION rows_supplied)
//{
//  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
//  register char * bufferptr;
//  register JSAMPROW ptr;
//  register JSAMPROW color_map = cinfo->colormap[0];
//  register JDIMENSION col;
//
//  ptr = dest->pub.buffer[0];
//  bufferptr = dest->iobuffer;
//  for (col = cinfo->output_width; col > 0; col--) {
//    PUTPPMSAMPLE(bufferptr, GETJSAMPLE(color_map[GETJSAMPLE(*ptr++)]));
//  }
//  (void) JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);
//}
//
//
///*
// * Startup: write the file header.
// */
//
//METHODDEF(void)
//start_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
//{
//  ppm_dest_ptr dest = (ppm_dest_ptr) dinfo;
//
//  /* Emit file header */
//  switch (cinfo->out_color_space) {
//  case JCS_GRAYSCALE:
//    /* emit header for raw PGM format */
//    fprintf(dest->pub.output_file, "P5\n%ld %ld\n%d\n",
//	    (long) cinfo->output_width, (long) cinfo->output_height,
//	    PPM_MAXVAL);
//    break;
//  case JCS_RGB:
//    /* emit header for raw PPM format */
//    fprintf(dest->pub.output_file, "P6\n%ld %ld\n%d\n",
//	    (long) cinfo->output_width, (long) cinfo->output_height,
//	    PPM_MAXVAL);
//    break;
//  default:
//    ERREXIT(cinfo, JERR_PPM_COLORSPACE);
//  }
//}
//
//
///*
// * Finish up at the end of the file.
// */
//
//METHODDEF(void)
//finish_output_ppm (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)
//{
//  /* Make sure we wrote the output file OK */
//  fflush(dinfo->output_file);
//  if (ferror(dinfo->output_file))
//    ERREXIT(cinfo, JERR_FILE_WRITE);
//}
//
//
///*
// * The module selection routine for PPM format output.
// */
//
//GLOBAL(djpeg_dest_ptr)
//jinit_write_ppm (j_decompress_ptr cinfo)
//{
//  ppm_dest_ptr dest;
//
//  /* Create module interface object, fill in method pointers */
//  dest = (ppm_dest_ptr)
//      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
//				  SIZEOF(ppm_dest_struct));
//  dest->pub.start_output = start_output_ppm;
//  dest->pub.finish_output = finish_output_ppm;
//
//  /* Calculate output image dimensions so we can allocate space */
//  jpeg_calc_output_dimensions(cinfo);
//
//  /* Create physical I/O buffer.  Note we make this near on a PC. */
//  dest->samples_per_row = cinfo->output_width * cinfo->out_color_components;
//  dest->buffer_width = dest->samples_per_row * (BYTESPERSAMPLE * SIZEOF(char));
//  dest->iobuffer = (char *) (*cinfo->mem->alloc_small)
//    ((j_common_ptr) cinfo, JPOOL_IMAGE, dest->buffer_width);
//
//  if (cinfo->quantize_colors || BITS_IN_JSAMPLE != 8 ||
//      SIZEOF(JSAMPLE) != SIZEOF(char)) {
//    /* When quantizing, we need an output buffer for colormap indexes
//     * that's separate from the physical I/O buffer.  We also need a
//     * separate buffer if pixel format translation must take place.
//     */
//    dest->pub.buffer = (*cinfo->mem->alloc_sarray)
//      ((j_common_ptr) cinfo, JPOOL_IMAGE,
//       cinfo->output_width * cinfo->output_components, (JDIMENSION) 1);
//    dest->pub.buffer_height = 1;
//    if (! cinfo->quantize_colors)
//      dest->pub.put_pixel_rows = copy_pixel_rows;
//    else if (cinfo->out_color_space == JCS_GRAYSCALE)
//      dest->pub.put_pixel_rows = put_demapped_gray;
//    else
//      dest->pub.put_pixel_rows = put_demapped_rgb;
//  } else {
//    /* We will fwrite() directly from decompressor output buffer. */
//    /* Synthesize a JSAMPARRAY pointer structure */
//    /* Cast here implies near->far pointer conversion on PCs */
//    dest->pixrow = (JSAMPROW) dest->iobuffer;
//    dest->pub.buffer = & dest->pixrow;
//    dest->pub.buffer_height = 1;
//    dest->pub.put_pixel_rows = put_pixel_rows;
//  }
//
//  return (djpeg_dest_ptr) dest;
//}

#endif /* PPM_SUPPORTED */
