/*

 * wrppm.c

 *

 * This file was part of the Independent JPEG Group's software:

 * Copyright (C) 1991-1996, Thomas G. Lane.

 * Modified 2009 by Guido Vollbeding.

 * libjpeg-turbo Modifications:

 * Copyright (C) 2017, 2019-2020, D. R. Commander.

 * For conditions of distribution and use, see the accompanying README.ijg

 * 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 "cmyk.h"

#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.

 */

/* Private version of data destination object */

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;

#if BITS_IN_JSAMPLE != 8 || (!defined(HAVE_UNSIGNED_CHAR) && !defined(__CHAR_UNSIGNED__))

  register JDIMENSION col;

#endif

  ptr = dest->pub.buffer[0];

  bufferptr = dest->iobuffer;

#if BITS_IN_JSAMPLE == 8 && (defined(HAVE_UNSIGNED_CHAR) || defined(__CHAR_UNSIGNED__))

  MEMCOPY(bufferptr, ptr, dest->samples_per_row);

#else

  for (col = dest->samples_per_row; col > 0; col--) {

    PUTPPMSAMPLE(bufferptr, GETJSAMPLE(*ptr++));

  }

#endif

  (void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);

}

/*

 * Convert extended RGB to RGB.

 */

METHODDEF(void)

put_rgb(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;

  register int rindex = rgb_red[cinfo->out_color_space];

  register int gindex = rgb_green[cinfo->out_color_space];

  register int bindex = rgb_blue[cinfo->out_color_space];

  register int ps = rgb_pixelsize[cinfo->out_color_space];

  ptr = dest->pub.buffer[0];

  bufferptr = dest->iobuffer;

  for (col = cinfo->output_width; col > 0; col--) {

    PUTPPMSAMPLE(bufferptr, ptr[rindex]);

    PUTPPMSAMPLE(bufferptr, ptr[gindex]);

    PUTPPMSAMPLE(bufferptr, ptr[bindex]);

    ptr += ps;

  }

  (void)JFWRITE(dest->pub.output_file, dest->iobuffer, dest->buffer_width);

}

/*

 * Convert CMYK to RGB.

 */

METHODDEF(void)

put_cmyk(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 = cinfo->output_width; col > 0; col--) {

    JSAMPLE r, g, b, c = *ptr++, m = *ptr++, y = *ptr++, k = *ptr++;

    cmyk_to_rgb(c, m, y, k, &r, &g, &b);

    PUTPPMSAMPLE(bufferptr, r);

    PUTPPMSAMPLE(bufferptr, g);

    PUTPPMSAMPLE(bufferptr, b);

  }

  (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:

  case JCS_EXT_RGB:

  case JCS_EXT_RGBX:

  case JCS_EXT_BGR:

  case JCS_EXT_BGRX:

  case JCS_EXT_XBGR:

  case JCS_EXT_XRGB:

  case JCS_EXT_RGBA:

  case JCS_EXT_BGRA:

  case JCS_EXT_ABGR:

  case JCS_EXT_ARGB:

  case JCS_CMYK:

    if (!IsExtRGB(cinfo->out_color_space) && cinfo->quantize_colors)

      ERREXIT(cinfo, JERR_PPM_COLORSPACE);

    /* 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);

}

/*

 * Re-calculate buffer dimensions based on output dimensions.

 */

METHODDEF(void)

calc_buffer_dimensions_ppm(j_decompress_ptr cinfo, djpeg_dest_ptr dinfo)

{

  ppm_dest_ptr dest = (ppm_dest_ptr)dinfo;

  if (cinfo->out_color_space == JCS_GRAYSCALE)

    dest->samples_per_row = cinfo->output_width * cinfo->out_color_components;

  else

    dest->samples_per_row = cinfo->output_width * 3;

  dest->buffer_width = dest->samples_per_row * (BYTESPERSAMPLE * sizeof(char));

}

/*

 * 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;

  dest->pub.calc_buffer_dimensions = calc_buffer_dimensions_ppm;

  /* Calculate output image dimensions so we can allocate space */

  jpeg_calc_output_dimensions(cinfo);

  /* Create physical I/O buffer */

  dest->pub.calc_buffer_dimensions(cinfo, (djpeg_dest_ptr)dest);

  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) ||

#if RGB_RED == 0 && RGB_GREEN == 1 && RGB_BLUE == 2 && RGB_PIXELSIZE == 3

      (cinfo->out_color_space != JCS_EXT_RGB &&

       cinfo->out_color_space != JCS_RGB)) {

#else

      cinfo->out_color_space != JCS_EXT_RGB) {

#endif

    /* 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) {

      if (IsExtRGB(cinfo->out_color_space))

        dest->pub.put_pixel_rows = put_rgb;

      else if (cinfo->out_color_space == JCS_CMYK)

        dest->pub.put_pixel_rows = put_cmyk;

      else

        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 */

    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 */