Source Code 1994 March/Source_Code_CD-ROM_Walnut_Creek_March_1994.iso/compsrcs/misc/volume34/jpeg/part07

Text File | 1992-12-16 | 58.4 KB | 1,220 lines

Newsgroups: comp.sources.misc
From: [e-mail] (Independent JPEG Group)
Subject:  v34i061:  jpeg - JPEG image compression, Part07/18
Message-ID: <[e-mail]>
X-Md4-Signature: 51d1adee0a296b28b49d70084b7a46fa
Date: Thu, 17 Dec 1992 04:17:56 GMT
Approved: [e-mail]

Submitted-by: [e-mail] (Independent JPEG Group)
Posting-number: Volume 34, Issue 61
Archive-name: jpeg/part07
Environment: UNIX, VMS, MS-DOS, Mac, Amiga, Atari, Cray
Supersedes: jpeg: Volume 29, Issue 1-18

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then feed it
# into a shell via "sh file" or similar.  To overwrite existing files,
# type "sh file -c".
# Contents:  jquant1.c timg.ppm.UU.B
# Wrapped by kent@sparky on Wed Dec 16 20:52:27 1992
PATH=/bin:/usr/bin:/usr/ucb:/usr/local/bin:/usr/lbin ; export PATH
echo If this archive is complete, you will see the following message:
echo '          "shar: End of archive 7 (of 18)."'
if test -f 'jquant1.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'jquant1.c'\"
else
  echo shar: Extracting \"'jquant1.c'\" \(22021 characters\)
  sed "s/^X//" >'jquant1.c' <<'END_OF_FILE'
X/*
X * jquant1.c
X *
X * Copyright (C) 1991, 1992, Thomas G. Lane.
X * This file is part of the Independent JPEG Group's software.
X * For conditions of distribution and use, see the accompanying README file.
X *
X * This file contains 1-pass color quantization (color mapping) routines.
X * These routines are invoked via the methods color_quantize
X * and color_quant_init/term.
X */
X
X#include "jinclude.h"
X
X#ifdef QUANT_1PASS_SUPPORTED
X
X
X/*
X * The main purpose of 1-pass quantization is to provide a fast, if not very
X * high quality, colormapped output capability.  A 2-pass quantizer usually
X * gives better visual quality; however, for quantized grayscale output this
X * quantizer is perfectly adequate.  Dithering is highly recommended with this
X * quantizer, though you can turn it off if you really want to.
X *
X * This implementation quantizes in the output colorspace.  This has a couple
X * of disadvantages: each pixel must be individually color-converted, and if
X * the color conversion includes gamma correction then quantization is done in
X * a nonlinear space, which is less desirable.  The major advantage is that
X * with the usual output color spaces (RGB, grayscale) an orthogonal grid of
X * representative colors can be used, thus permitting the very simple and fast
X * color lookup scheme used here.  The standard JPEG colorspace (YCbCr) cannot
X * be effectively handled this way, because only about a quarter of an
X * orthogonal grid would fall within the gamut of realizable colors.  Another
X * advantage is that when the user wants quantized grayscale output from a
X * color JPEG file, this quantizer can provide a high-quality result with no
X * special hacking.
X *
X * The gamma-correction problem could be eliminated by adjusting the grid
X * spacing to counteract the gamma correction applied by color_convert.
X * At this writing, gamma correction is not implemented by jdcolor, so
X * nothing is done here.
X *
X * In 1-pass quantization the colormap must be chosen in advance of seeing the
X * image.  We use a map consisting of all combinations of Ncolors[i] color
X * values for the i'th component.  The Ncolors[] values are chosen so that
X * their product, the total number of colors, is no more than that requested.
X * (In most cases, the product will be somewhat less.)
X *
X * Since the colormap is orthogonal, the representative value for each color
X * component can be determined without considering the other components;
X * then these indexes can be combined into a colormap index by a standard
X * N-dimensional-array-subscript calculation.  Most of the arithmetic involved
X * can be precalculated and stored in the lookup table colorindex[].
X * colorindex[i][j] maps pixel value j in component i to the nearest
X * representative value (grid plane) for that component; this index is
X * multiplied by the array stride for component i, so that the
X * index of the colormap entry closest to a given pixel value is just
X *    sum( colorindex[component-number][pixel-component-value] )
X * Aside from being fast, this scheme allows for variable spacing between
X * representative values with no additional lookup cost.
X */
X
X
X#define MAX_COMPONENTS 4    /* max components I can handle */
X
Xstatic JSAMPARRAY colormap;    /* The actual color map */
X/* colormap[i][j] = value of i'th color component for output pixel value j */
X
Xstatic JSAMPARRAY colorindex;    /* Precomputed mapping for speed */
X/* colorindex[i][j] = index of color closest to pixel value j in component i,
X * premultiplied as described above.  Since colormap indexes must fit into
X * JSAMPLEs, the entries of this array will too.
X */
X
Xstatic JSAMPARRAY input_buffer;    /* color conversion workspace */
X/* Since our input data is presented in the JPEG colorspace, we have to call
X * color_convert to get it into the output colorspace.  input_buffer is a
X * one-row-high workspace for the result of color_convert.
X */
X
X
X/* Declarations for Floyd-Steinberg dithering.
X *
X * Errors are accumulated into the arrays evenrowerrs[] and oddrowerrs[].
X * These have resolutions of 1/16th of a pixel count.  The error at a given
X * pixel is propagated to its unprocessed neighbors using the standard F-S
X * fractions,
X *        ...    (here)    7/16
X *        3/16    5/16    1/16
X * We work left-to-right on even rows, right-to-left on odd rows.
X *
X * In each of the xxxrowerrs[] arrays, indexing is [component#][position].
X * We provide (#columns + 2) entries per component; the extra entry at each
X * end saves us from special-casing the first and last pixels.
X * In evenrowerrs[], the entries for a component are stored left-to-right, but
X * in oddrowerrs[] they are stored right-to-left.  This means we always
X * process the current row's error entries in increasing order and the next
X * row's error entries in decreasing order, regardless of whether we are
X * working L-to-R or R-to-L in the pixel data!
X *
X * Note: on a wide image, we might not have enough room in a PC's near data
X * segment to hold the error arrays; so they are allocated with alloc_medium.
X */
X
X#ifdef EIGHT_BIT_SAMPLES
Xtypedef INT16 FSERROR;        /* 16 bits should be enough */
X#else
Xtypedef INT32 FSERROR;        /* may need more than 16 bits? */
X#endif
X
Xtypedef FSERROR FAR *FSERRPTR;    /* pointer to error array (in FAR storage!) */
X
Xstatic FSERRPTR evenrowerrs[MAX_COMPONENTS]; /* errors for even rows */
Xstatic FSERRPTR oddrowerrs[MAX_COMPONENTS];  /* errors for odd rows */
Xstatic boolean on_odd_row;    /* flag to remember which row we are on */
X
X
X/*
X * Policy-making subroutines for color_quant_init: these routines determine
X * the colormap to be used.  The rest of the module only assumes that the
X * colormap is orthogonal.
X *
X *  * select_ncolors decides how to divvy up the available colors
X *    among the components.
X *  * output_value defines the set of representative values for a component.
X *  * largest_input_value defines the mapping from input values to
X *    representative values for a component.
X * Note that the latter two routines may impose different policies for
X * different components, though this is not currently done.
X */
X
X
XLOCAL int
Xselect_ncolors (decompress_info_ptr cinfo, int Ncolors[])
X/* Determine allocation of desired colors to components, */
X/* and fill in Ncolors[] array to indicate choice. */
X/* Return value is total number of colors (product of Ncolors[] values). */
X{
X  int nc = cinfo->color_out_comps; /* number of color components */
X  int max_colors = cinfo->desired_number_of_colors;
X  int total_colors, iroot, i;
X  long temp;
X  boolean changed;
X
X  /* We can allocate at least the nc'th root of max_colors per component. */
X  /* Compute floor(nc'th root of max_colors). */
X  iroot = 1;
X  do {
X    iroot++;
X    temp = iroot;        /* set temp = iroot ** nc */
X    for (i = 1; i < nc; i++)
X      temp *= iroot;
X  } while (temp <= (long) max_colors); /* repeat till iroot exceeds root */
X  iroot--;            /* now iroot = floor(root) */
X
X  /* Must have at least 2 color values per component */
X  if (iroot < 2)
X    ERREXIT1(cinfo->emethods, "Cannot quantize to fewer than %d colors",
X         (int) temp);
X
X  if (cinfo->out_color_space == CS_RGB && nc == 3) {
X    /* We provide a special policy for quantizing in RGB space.
X     * If 256 colors are requested, we allocate 8 red, 8 green, 4 blue levels;
X     * this corresponds to the common 3/3/2-bit scheme.  For other totals,
X     * the counts are set so that the number of colors allocated to each
X     * component are roughly in the proportion R 3, G 4, B 2.
X     * For low color counts, it's easier to hardwire the optimal choices
X     * than try to tweak the algorithm to generate them.
X     */
X    if (max_colors == 256) {
X      Ncolors[0] = 8;  Ncolors[1] = 8;  Ncolors[2] = 4;
X      return 256;
X    }
X    if (max_colors < 12) {
X      /* Fixed mapping for 8 colors */
X      Ncolors[0] = Ncolors[1] = Ncolors[2] = 2;
X    } else if (max_colors < 18) {
X      /* Fixed mapping for 12 colors */
X      Ncolors[0] = 2;  Ncolors[1] = 3;  Ncolors[2] = 2;
X    } else if (max_colors < 24) {
X      /* Fixed mapping for 18 colors */
X      Ncolors[0] = 3;  Ncolors[1] = 3;  Ncolors[2] = 2;
X    } else if (max_colors < 27) {
X      /* Fixed mapping for 24 colors */
X      Ncolors[0] = 3;  Ncolors[1] = 4;  Ncolors[2] = 2;
X    } else if (max_colors < 36) {
X      /* Fixed mapping for 27 colors */
X      Ncolors[0] = 3;  Ncolors[1] = 3;  Ncolors[2] = 3;
X    } else {
X      /* these weights are readily derived with a little algebra */
X      Ncolors[0] = (iroot * 266) >> 8; /* R weight is 1.0400 */
X      Ncolors[1] = (iroot * 355) >> 8; /* G weight is 1.3867 */
X      Ncolors[2] = (iroot * 177) >> 8; /* B weight is 0.6934 */
X    }
X    total_colors = Ncolors[0] * Ncolors[1] * Ncolors[2];
X    /* The above computation produces "floor" values, so we may be able to
X     * increment the count for one or more components without exceeding
X     * max_colors.  We try in the order B, G, R.
X     */
X    do {
X      changed = FALSE;
X      for (i = 2; i >= 0; i--) {
X    /* calculate new total_colors if Ncolors[i] is incremented */
X    temp = total_colors / Ncolors[i];
X    temp *= Ncolors[i]+1;    /* done in long arith to avoid oflo */
X    if (temp <= (long) max_colors) {
X      Ncolors[i]++;        /* OK, apply the increment */
X      total_colors = (int) temp;
X      changed = TRUE;
X    }
X      }
X    } while (changed);        /* loop until no increment is possible */
X  } else {
X    /* For any colorspace besides RGB, treat all the components equally. */
X
X    /* Initialize to iroot color values for each component */
X    total_colors = 1;
X    for (i = 0; i < nc; i++) {
X      Ncolors[i] = iroot;
X      total_colors *= iroot;
X    }
X    /* We may be able to increment the count for one or more components without
X     * exceeding max_colors, though we know not all can be incremented.
X     */
X    for (i = 0; i < nc; i++) {
X      /* calculate new total_colors if Ncolors[i] is incremented */
X      temp = total_colors / Ncolors[i];
X      temp *= Ncolors[i]+1;    /* done in long arith to avoid oflo */
X      if (temp > (long) max_colors)
X    break;            /* won't fit, done */
X      Ncolors[i]++;        /* OK, apply the increment */
X      total_colors = (int) temp;
X    }
X  }
X
X  return total_colors;
X}
X
X
XLOCAL int
Xoutput_value (decompress_info_ptr cinfo, int ci, int j, int maxj)
X/* Return j'th output value, where j will range from 0 to maxj */
X/* The output values must fall in 0..MAXJSAMPLE in increasing order */
X{
X  /* We always provide values 0 and MAXJSAMPLE for each component;
X   * any additional values are equally spaced between these limits.
X   * (Forcing the upper and lower values to the limits ensures that
X   * dithering can't produce a color outside the selected gamut.)
X   */
X  return (int) (((INT32) j * MAXJSAMPLE + maxj/2) / maxj);
X}
X
X
XLOCAL int
Xlargest_input_value (decompress_info_ptr cinfo, int ci, int j, int maxj)
X/* Return largest input value that should map to j'th output value */
X/* Must have largest(j=0) >= 0, and largest(j=maxj) >= MAXJSAMPLE */
X{
X  /* Breakpoints are halfway between values returned by output_value */
X  return (int) (((INT32) (2*j + 1) * MAXJSAMPLE + maxj) / (2*maxj));
X}
X
X
X/*
X * Initialize for one-pass color quantization.
X */
X
XMETHODDEF void
Xcolor_quant_init (decompress_info_ptr cinfo)
X{
X  int total_colors;        /* Number of distinct output colors */
X  int Ncolors[MAX_COMPONENTS];    /* # of values alloced to each component */
X  int i,j,k, nci, blksize, blkdist, ptr, val;
X
X  /* Make sure my internal arrays won't overflow */
X  if (cinfo->num_components > MAX_COMPONENTS ||
X      cinfo->color_out_comps > MAX_COMPONENTS)
X    ERREXIT1(cinfo->emethods, "Cannot quantize more than %d color components",
X         MAX_COMPONENTS);
X  /* Make sure colormap indexes can be represented by JSAMPLEs */
X  if (cinfo->desired_number_of_colors > (MAXJSAMPLE+1))
X    ERREXIT1(cinfo->emethods, "Cannot request more than %d quantized colors",
X         MAXJSAMPLE+1);
X
X  /* Select number of colors for each component */
X  total_colors = select_ncolors(cinfo, Ncolors);
X
X  /* Report selected color counts */
X  if (cinfo->color_out_comps == 3)
X    TRACEMS4(cinfo->emethods, 1, "Quantizing to %d = %d*%d*%d colors",
X         total_colors, Ncolors[0], Ncolors[1], Ncolors[2]);
X  else
X    TRACEMS1(cinfo->emethods, 1, "Quantizing to %d colors", total_colors);
X
X  /* Allocate and fill in the colormap and color index. */
X  /* The colors are ordered in the map in standard row-major order, */
X  /* i.e. rightmost (highest-indexed) color changes most rapidly. */
X
X  colormap = (*cinfo->emethods->alloc_small_sarray)
X        ((long) total_colors, (long) cinfo->color_out_comps);
X  colorindex = (*cinfo->emethods->alloc_small_sarray)
X        ((long) (MAXJSAMPLE+1), (long) cinfo->color_out_comps);
X
X  /* blksize is number of adjacent repeated entries for a component */
X  /* blkdist is distance between groups of identical entries for a component */
X  blkdist = total_colors;
X
X  for (i = 0; i < cinfo->color_out_comps; i++) {
X    /* fill in colormap entries for i'th color component */
X    nci = Ncolors[i];        /* # of distinct values for this color */
X    blksize = blkdist / nci;
X    for (j = 0; j < nci; j++) {
X      /* Compute j'th output value (out of nci) for component */
X      val = output_value(cinfo, i, j, nci-1);
X      /* Fill in all colormap entries that have this value of this component */
X      for (ptr = j * blksize; ptr < total_colors; ptr += blkdist) {
X    /* fill in blksize entries beginning at ptr */
X    for (k = 0; k < blksize; k++)
X      colormap[i][ptr+k] = (JSAMPLE) val;
X      }
X    }
X    blkdist = blksize;        /* blksize of this color is blkdist of next */
X
X    /* fill in colorindex entries for i'th color component */
X    /* in loop, val = index of current output value, */
X    /* and k = largest j that maps to current val */
X    val = 0;
X    k = largest_input_value(cinfo, i, 0, nci-1);
X    for (j = 0; j <= MAXJSAMPLE; j++) {
X      while (j > k)        /* advance val if past boundary */
X    k = largest_input_value(cinfo, i, ++val, nci-1);
X      /* premultiply so that no multiplication needed in main processing */
X      colorindex[i][j] = (JSAMPLE) (val * blksize);
X    }
X  }
X
X  /* Pass the colormap to the output module. */
X  /* NB: the output module may continue to use the colormap until shutdown. */
X  cinfo->colormap = colormap;
X  cinfo->actual_number_of_colors = total_colors;
X  (*cinfo->methods->put_color_map) (cinfo, total_colors, colormap);
X
X  /* Allocate workspace to hold one row of color-converted data */
X  input_buffer = (*cinfo->emethods->alloc_small_sarray)
X            (cinfo->image_width, (long) cinfo->color_out_comps);
X
X  /* Allocate Floyd-Steinberg workspace if necessary */
X  if (cinfo->use_dithering) {
X    size_t arraysize = (size_t) ((cinfo->image_width + 2L) * SIZEOF(FSERROR));
X
X    for (i = 0; i < cinfo->color_out_comps; i++) {
X      evenrowerrs[i] = (FSERRPTR) (*cinfo->emethods->alloc_medium) (arraysize);
X      oddrowerrs[i]  = (FSERRPTR) (*cinfo->emethods->alloc_medium) (arraysize);
X      /* we only need to zero the forward contribution for current row. */
X      jzero_far((void FAR *) evenrowerrs[i], arraysize);
X    }
X    on_odd_row = FALSE;
X  }
X}
X
X
X/*
X * Subroutines for color conversion methods.
X */
X
XLOCAL void
Xdo_color_conversion (decompress_info_ptr cinfo, JSAMPIMAGE input_data, int row)
X/* Convert the indicated row of the input data into output colorspace */
X/* in input_buffer.  This requires a little trickery since color_convert */
X/* expects to deal with 3-D arrays; fortunately we can fake it out */
X/* at fairly low cost. */
X{
X  short ci;
X  JSAMPARRAY input_hack[MAX_COMPONENTS];
X  JSAMPARRAY output_hack[MAX_COMPONENTS];
X
X  /* create JSAMPIMAGE pointing at specified row of input_data */
X  for (ci = 0; ci < cinfo->num_components; ci++)
X    input_hack[ci] = input_data[ci] + row;
X  /* Create JSAMPIMAGE pointing at input_buffer */
X  for (ci = 0; ci < cinfo->color_out_comps; ci++)
X    output_hack[ci] = &(input_buffer[ci]);
X
X  (*cinfo->methods->color_convert) (cinfo, 1, cinfo->image_width,
X                    input_hack, output_hack);
X}
X
X
X/*
X * Map some rows of pixels to the output colormapped representation.
X */
X
XMETHODDEF void
Xcolor_quantize (decompress_info_ptr cinfo, int num_rows,
X        JSAMPIMAGE input_data, JSAMPARRAY output_data)
X/* General case, no dithering */
X{
X  register int pixcode, ci;
X  register JSAMPROW ptrout;
X  register long col;
X  int row;
X  long width = cinfo->image_width;
X  register int nc = cinfo->color_out_comps;
X
X  for (row = 0; row < num_rows; row++) {
X    do_color_conversion(cinfo, input_data, row);
X    ptrout = output_data[row];
X    for (col = 0; col < width; col++) {
X      pixcode = 0;
X      for (ci = 0; ci < nc; ci++) {
X    pixcode += GETJSAMPLE(colorindex[ci]
X                  [GETJSAMPLE(input_buffer[ci][col])]);
X      }
X      *ptrout++ = (JSAMPLE) pixcode;
X    }
X  }
X}
X
X
XMETHODDEF void
Xcolor_quantize3 (decompress_info_ptr cinfo, int num_rows,
X         JSAMPIMAGE input_data, JSAMPARRAY output_data)
X/* Fast path for color_out_comps==3, no dithering */
X{
X  register int pixcode;
X  register JSAMPROW ptr0, ptr1, ptr2, ptrout;
X  register long col;
X  int row;
X  long width = cinfo->image_width;
X
X  for (row = 0; row < num_rows; row++) {
X    do_color_conversion(cinfo, input_data, row);
X    ptr0 = input_buffer[0];
X    ptr1 = input_buffer[1];
X    ptr2 = input_buffer[2];
X    ptrout = output_data[row];
X    for (col = width; col > 0; col--) {
X      pixcode  = GETJSAMPLE(colorindex[0][GETJSAMPLE(*ptr0++)]);
X      pixcode += GETJSAMPLE(colorindex[1][GETJSAMPLE(*ptr1++)]);
X      pixcode += GETJSAMPLE(colorindex[2][GETJSAMPLE(*ptr2++)]);
X      *ptrout++ = (JSAMPLE) pixcode;
X    }
X  }
X}
X
X
XMETHODDEF void
Xcolor_quantize_dither (decompress_info_ptr cinfo, int num_rows,
X               JSAMPIMAGE input_data, JSAMPARRAY output_data)
X/* General case, with Floyd-Steinberg dithering */
X{
X  register FSERROR val;
X  FSERROR two_val;
X  register FSERRPTR thisrowerr, nextrowerr;
X  register JSAMPROW input_ptr;
X  register JSAMPROW output_ptr;
X  JSAMPLE *range_limit = cinfo->sample_range_limit;
X  JSAMPROW colorindex_ci;
X  JSAMPROW colormap_ci;
X  register int pixcode;
X  int dir;            /* 1 for left-to-right, -1 for right-to-left */
X  int ci;
X  int nc = cinfo->color_out_comps;
X  int row;
X  long col_counter;
X  long width = cinfo->image_width;
X  SHIFT_TEMPS
X
X  for (row = 0; row < num_rows; row++) {
X    do_color_conversion(cinfo, input_data, row);
X    /* Initialize output values to 0 so can process components separately */
X    jzero_far((void FAR *) output_data[row],
X          (size_t) (width * SIZEOF(JSAMPLE)));
X    for (ci = 0; ci < nc; ci++) {
X      if (on_odd_row) {
X    /* work right to left in this row */
X    dir = -1;
X    input_ptr = input_buffer[ci] + (width-1);
X    output_ptr = output_data[row] + (width-1);
X    thisrowerr = oddrowerrs[ci] + 1;
X    nextrowerr = evenrowerrs[ci] + width;
X      } else {
X    /* work left to right in this row */
X    dir = 1;
X    input_ptr = input_buffer[ci];
X    output_ptr = output_data[row];
X    thisrowerr = evenrowerrs[ci] + 1;
X    nextrowerr = oddrowerrs[ci] + width;
X      }
X      colorindex_ci = colorindex[ci];
X      colormap_ci = colormap[ci];
X      *nextrowerr = 0;        /* need only initialize this one entry */
X      for (col_counter = width; col_counter > 0; col_counter--) {
X    /* Get accumulated error for this component, round to integer.
X     * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct
X     * for either sign of the error value.
X     */
X    val = RIGHT_SHIFT(*thisrowerr + 8, 4);
X    /* Compute pixel value + error compensation, range-limit to
X     * 0..MAXJSAMPLE.  Note max error value is +- MAXJSAMPLE.
X     */
X    val = GETJSAMPLE(range_limit[GETJSAMPLE(*input_ptr) + val]);
X    /* Select output value, accumulate into output code for this pixel */
X    pixcode = GETJSAMPLE(*output_ptr) + GETJSAMPLE(colorindex_ci[val]);
X    *output_ptr = (JSAMPLE) pixcode;
X    /* Compute actual representation error at this pixel */
X    /* Note: we can do this even though we don't yet have the final */
X    /* value of pixcode, because the colormap is orthogonal. */
X    val -= GETJSAMPLE(colormap_ci[pixcode]);
X    /* Propagate error to (same component of) adjacent pixels */
X    /* Remember that nextrowerr entries are in reverse order! */
X    two_val = val * 2;
X    nextrowerr[-1]  = val; /* not +=, since not initialized yet */
X    val += two_val;        /* form error * 3 */
X    nextrowerr[ 1] += val;
X    val += two_val;        /* form error * 5 */
X    nextrowerr[ 0] += val;
X    val += two_val;        /* form error * 7 */
X    thisrowerr[ 1] += val;
X    input_ptr += dir;    /* advance input ptr to next column */
X    output_ptr += dir;    /* advance output ptr to next column */
X    thisrowerr++;        /* cur-row error ptr advances to right */
X    nextrowerr--;        /* next-row error ptr advances to left */
X      }
X    }
X    on_odd_row = (on_odd_row ? FALSE : TRUE);
X  }
X}
X
X
X/*
X * Finish up at the end of the file.
X */
X
XMETHODDEF void
Xcolor_quant_term (decompress_info_ptr cinfo)
X{
X  /* no work (we let free_all release the workspace) */
X  /* Note that we *mustn't* free the colormap before free_all, */
X  /* since output module may use it! */
X}
X
X
X/*
X * Prescan some rows of pixels.
X * Not used in one-pass case.
X */
X
XMETHODDEF void
Xcolor_quant_prescan (decompress_info_ptr cinfo, int num_rows,
X             JSAMPIMAGE image_data, JSAMPARRAY workspace)
X{
X  ERREXIT(cinfo->emethods, "Should not get here!");
X}
X
X
X/*
X * Do two-pass quantization.
X * Not used in one-pass case.
X */
X
XMETHODDEF void
Xcolor_quant_doit (decompress_info_ptr cinfo, quantize_caller_ptr source_method)
X{
X  ERREXIT(cinfo->emethods, "Should not get here!");
X}
X
X
X/*
X * The method selection routine for 1-pass color quantization.
X */
X
XGLOBAL void
Xjsel1quantize (decompress_info_ptr cinfo)
X{
X  if (! cinfo->two_pass_quantize) {
X    cinfo->methods->color_quant_init = color_quant_init;
X    if (cinfo->use_dithering) {
X      cinfo->methods->color_quantize = color_quantize_dither;
X    } else {
X      if (cinfo->color_out_comps == 3)
X    cinfo->methods->color_quantize = color_quantize3;
X      else
X    cinfo->methods->color_quantize = color_quantize;
X    }
X    cinfo->methods->color_quant_prescan = color_quant_prescan;
X    cinfo->methods->color_quant_doit = color_quant_doit;
X    cinfo->methods->color_quant_term = color_quant_term;
X  }
X}
X
X#endif /* QUANT_1PASS_SUPPORTED */
END_OF_FILE
  if test 22021 -ne `wc -c <'jquant1.c'`; then
    echo shar: \"'jquant1.c'\" unpacked with wrong size!
  fi
  # end of 'jquant1.c'
fi
if test -f 'timg.ppm.UU.B' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'timg.ppm.UU.B'\"
else
  echo shar: Extracting \"'timg.ppm.UU.B'\" \(33672 characters\)
  sed "s/^X//" >'timg.ppm.UU.B' <<'END_OF_FILE'
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END_OF_FILE
  if test 33672 -ne `wc -c <'timg.ppm.UU.B'`; then
    echo shar: \"'timg.ppm.UU.B'\" unpacked with wrong size!
  elif test -f 'timg.ppm.UU.A'; then
    echo shar: Combining  \"'testimg.ppm.U'\" \(64632 characters\)
    cat 'timg.ppm.UU.A' 'timg.ppm.UU.B' > 'testimg.ppm.U'
    if test 64632 -ne `wc -c <'testimg.ppm.U'`; then
      echo shar: \"'testimg.ppm.U'\" combined with wrong size!
    else
      rm timg.ppm.UU.A timg.ppm.UU.B
      if test 64632 -ne `wc -c <'testimg.ppm.U'`; then
         echo shar: \"'testimg.ppm.U'\" unpacked with wrong size!
      else
         echo shar: Uudecoding \"'testimg.ppm'\" \(46890 characters\)
         cat testimg.ppm.U | uudecode
         if test 46890 -ne `wc -c <'testimg.ppm'`; then
           echo shar: \"'testimg.ppm'\" uudecoded with wrong size!
         else
           rm testimg.ppm.U
         fi
       fi
       # end of 'testimg.ppm.U'
    fi
  fi
  # end of 'timg.ppm.UU.B'
fi
echo shar: End of archive 7 \(of 18\).
cp /dev/null ark7isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 18 archives.
    rm -f ark[1-9]isdone ark[1-9][0-9]isdone
else
    echo You still must unpack the following archives:
    echo "        " ${MISSING}
fi
exit 0
exit 0 # Just in case...