libjpeg update

git-svn-id: http://svn.miranda-ng.org/main/trunk@5843 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 637 insertions, 632 deletions

diff --git a/plugins/AdvaImg/src/LibJPEG/jcparam.c b/plugins/AdvaImg/src/LibJPEG/jcparam.c
index c5e85dda55..f440bc9d0e 100644
--- a/plugins/AdvaImg/src/LibJPEG/jcparam.c
+++ b/plugins/AdvaImg/src/LibJPEG/jcparam.c
@@ -1,632 +1,637 @@
-/*
- * jcparam.c
- *
- * Copyright (C) 1991-1998, Thomas G. Lane.
- * Modified 2003-2008 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 optional default-setting code for the JPEG compressor.
- * Applications do not have to use this file, but those that don't use it
- * must know a lot more about the innards of the JPEG code.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-/*
- * Quantization table setup routines
- */
-
-GLOBAL(void)
-jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
-		      const unsigned int *basic_table,
-		      int scale_factor, boolean force_baseline)
-/* Define a quantization table equal to the basic_table times
- * a scale factor (given as a percentage).
- * If force_baseline is TRUE, the computed quantization table entries
- * are limited to 1..255 for JPEG baseline compatibility.
- */
-{
-  JQUANT_TBL ** qtblptr;
-  int i;
-  long temp;
-
-  /* Safety check to ensure start_compress not called yet. */
-  if (cinfo->global_state != CSTATE_START)
-    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
-  if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
-    ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
-
-  qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
-
-  if (*qtblptr == NULL)
-    *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
-
-  for (i = 0; i < DCTSIZE2; i++) {
-    temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
-    /* limit the values to the valid range */
-    if (temp <= 0L) temp = 1L;
-    if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
-    if (force_baseline && temp > 255L)
-      temp = 255L;		/* limit to baseline range if requested */
-    (*qtblptr)->quantval[i] = (UINT16) temp;
-  }
-
-  /* Initialize sent_table FALSE so table will be written to JPEG file. */
-  (*qtblptr)->sent_table = FALSE;
-}
-
-
-/* These are the sample quantization tables given in JPEG spec section K.1.
- * The spec says that the values given produce "good" quality, and
- * when divided by 2, "very good" quality.
- */
-static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
-  16,  11,  10,  16,  24,  40,  51,  61,
-  12,  12,  14,  19,  26,  58,  60,  55,
-  14,  13,  16,  24,  40,  57,  69,  56,
-  14,  17,  22,  29,  51,  87,  80,  62,
-  18,  22,  37,  56,  68, 109, 103,  77,
-  24,  35,  55,  64,  81, 104, 113,  92,
-  49,  64,  78,  87, 103, 121, 120, 101,
-  72,  92,  95,  98, 112, 100, 103,  99
-};
-static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
-  17,  18,  24,  47,  99,  99,  99,  99,
-  18,  21,  26,  66,  99,  99,  99,  99,
-  24,  26,  56,  99,  99,  99,  99,  99,
-  47,  66,  99,  99,  99,  99,  99,  99,
-  99,  99,  99,  99,  99,  99,  99,  99,
-  99,  99,  99,  99,  99,  99,  99,  99,
-  99,  99,  99,  99,  99,  99,  99,  99,
-  99,  99,  99,  99,  99,  99,  99,  99
-};
-
-
-GLOBAL(void)
-jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
-/* Set or change the 'quality' (quantization) setting, using default tables
- * and straight percentage-scaling quality scales.
- * This entry point allows different scalings for luminance and chrominance.
- */
-{
-  /* Set up two quantization tables using the specified scaling */
-  jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
-		       cinfo->q_scale_factor[0], force_baseline);
-  jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
-		       cinfo->q_scale_factor[1], force_baseline);
-}
-
-
-GLOBAL(void)
-jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
-			 boolean force_baseline)
-/* Set or change the 'quality' (quantization) setting, using default tables
- * and a straight percentage-scaling quality scale.  In most cases it's better
- * to use jpeg_set_quality (below); this entry point is provided for
- * applications that insist on a linear percentage scaling.
- */
-{
-  /* Set up two quantization tables using the specified scaling */
-  jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
-		       scale_factor, force_baseline);
-  jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
-		       scale_factor, force_baseline);
-}
-
-
-GLOBAL(int)
-jpeg_quality_scaling (int quality)
-/* Convert a user-specified quality rating to a percentage scaling factor
- * for an underlying quantization table, using our recommended scaling curve.
- * The input 'quality' factor should be 0 (terrible) to 100 (very good).
- */
-{
-  /* Safety limit on quality factor.  Convert 0 to 1 to avoid zero divide. */
-  if (quality <= 0) quality = 1;
-  if (quality > 100) quality = 100;
-
-  /* The basic table is used as-is (scaling 100) for a quality of 50.
-   * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
-   * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
-   * to make all the table entries 1 (hence, minimum quantization loss).
-   * Qualities 1..50 are converted to scaling percentage 5000/Q.
-   */
-  if (quality < 50)
-    quality = 5000 / quality;
-  else
-    quality = 200 - quality*2;
-
-  return quality;
-}
-
-
-GLOBAL(void)
-jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
-/* Set or change the 'quality' (quantization) setting, using default tables.
- * This is the standard quality-adjusting entry point for typical user
- * interfaces; only those who want detailed control over quantization tables
- * would use the preceding three routines directly.
- */
-{
-  /* Convert user 0-100 rating to percentage scaling */
-  quality = jpeg_quality_scaling(quality);
-
-  /* Set up standard quality tables */
-  jpeg_set_linear_quality(cinfo, quality, force_baseline);
-}
-
-
-/*
- * Huffman table setup routines
- */
-
-LOCAL(void)
-add_huff_table (j_compress_ptr cinfo,
-		JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
-/* Define a Huffman table */
-{
-  int nsymbols, len;
-
-  if (*htblptr == NULL)
-    *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
-
-  /* Copy the number-of-symbols-of-each-code-length counts */
-  MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
-
-  /* Validate the counts.  We do this here mainly so we can copy the right
-   * number of symbols from the val[] array, without risking marching off
-   * the end of memory.  jchuff.c will do a more thorough test later.
-   */
-  nsymbols = 0;
-  for (len = 1; len <= 16; len++)
-    nsymbols += bits[len];
-  if (nsymbols < 1 || nsymbols > 256)
-    ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
-
-  MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));
-
-  /* Initialize sent_table FALSE so table will be written to JPEG file. */
-  (*htblptr)->sent_table = FALSE;
-}
-
-
-LOCAL(void)
-std_huff_tables (j_compress_ptr cinfo)
-/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
-/* IMPORTANT: these are only valid for 8-bit data precision! */
-{
-  static const UINT8 bits_dc_luminance[17] =
-    { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
-  static const UINT8 val_dc_luminance[] =
-    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
-  
-  static const UINT8 bits_dc_chrominance[17] =
-    { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
-  static const UINT8 val_dc_chrominance[] =
-    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
-  
-  static const UINT8 bits_ac_luminance[17] =
-    { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
-  static const UINT8 val_ac_luminance[] =
-    { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
-      0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
-      0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
-      0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
-      0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
-      0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
-      0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
-      0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
-      0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
-      0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
-      0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
-      0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
-      0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
-      0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
-      0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
-      0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
-      0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
-      0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
-      0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
-      0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
-      0xf9, 0xfa };
-  
-  static const UINT8 bits_ac_chrominance[17] =
-    { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
-  static const UINT8 val_ac_chrominance[] =
-    { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
-      0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
-      0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
-      0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
-      0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
-      0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
-      0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
-      0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
-      0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
-      0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
-      0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
-      0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
-      0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
-      0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
-      0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
-      0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
-      0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
-      0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
-      0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
-      0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
-      0xf9, 0xfa };
-  
-  add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0],
-		 bits_dc_luminance, val_dc_luminance);
-  add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0],
-		 bits_ac_luminance, val_ac_luminance);
-  add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1],
-		 bits_dc_chrominance, val_dc_chrominance);
-  add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1],
-		 bits_ac_chrominance, val_ac_chrominance);
-}
-
-
-/*
- * Default parameter setup for compression.
- *
- * Applications that don't choose to use this routine must do their
- * own setup of all these parameters.  Alternately, you can call this
- * to establish defaults and then alter parameters selectively.  This
- * is the recommended approach since, if we add any new parameters,
- * your code will still work (they'll be set to reasonable defaults).
- */
-
-GLOBAL(void)
-jpeg_set_defaults (j_compress_ptr cinfo)
-{
-  int i;
-
-  /* Safety check to ensure start_compress not called yet. */
-  if (cinfo->global_state != CSTATE_START)
-    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
-  /* Allocate comp_info array large enough for maximum component count.
-   * Array is made permanent in case application wants to compress
-   * multiple images at same param settings.
-   */
-  if (cinfo->comp_info == NULL)
-    cinfo->comp_info = (jpeg_component_info *)
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
-				  MAX_COMPONENTS * SIZEOF(jpeg_component_info));
-
-  /* Initialize everything not dependent on the color space */
-
-  cinfo->scale_num = 1;		/* 1:1 scaling */
-  cinfo->scale_denom = 1;
-  cinfo->data_precision = BITS_IN_JSAMPLE;
-  /* Set up two quantization tables using default quality of 75 */
-  jpeg_set_quality(cinfo, 75, TRUE);
-  /* Set up two Huffman tables */
-  std_huff_tables(cinfo);
-
-  /* Initialize default arithmetic coding conditioning */
-  for (i = 0; i < NUM_ARITH_TBLS; i++) {
-    cinfo->arith_dc_L[i] = 0;
-    cinfo->arith_dc_U[i] = 1;
-    cinfo->arith_ac_K[i] = 5;
-  }
-
-  /* Default is no multiple-scan output */
-  cinfo->scan_info = NULL;
-  cinfo->num_scans = 0;
-
-  /* Expect normal source image, not raw downsampled data */
-  cinfo->raw_data_in = FALSE;
-
-  /* Use Huffman coding, not arithmetic coding, by default */
-  cinfo->arith_code = FALSE;
-
-  /* By default, don't do extra passes to optimize entropy coding */
-  cinfo->optimize_coding = FALSE;
-  /* The standard Huffman tables are only valid for 8-bit data precision.
-   * If the precision is higher, force optimization on so that usable
-   * tables will be computed.  This test can be removed if default tables
-   * are supplied that are valid for the desired precision.
-   */
-  if (cinfo->data_precision > 8)
-    cinfo->optimize_coding = TRUE;
-
-  /* By default, use the simpler non-cosited sampling alignment */
-  cinfo->CCIR601_sampling = FALSE;
-
-  /* By default, apply fancy downsampling */
-  cinfo->do_fancy_downsampling = TRUE;
-
-  /* No input smoothing */
-  cinfo->smoothing_factor = 0;
-
-  /* DCT algorithm preference */
-  cinfo->dct_method = JDCT_DEFAULT;
-
-  /* No restart markers */
-  cinfo->restart_interval = 0;
-  cinfo->restart_in_rows = 0;
-
-  /* Fill in default JFIF marker parameters.  Note that whether the marker
-   * will actually be written is determined by jpeg_set_colorspace.
-   *
-   * By default, the library emits JFIF version code 1.01.
-   * An application that wants to emit JFIF 1.02 extension markers should set
-   * JFIF_minor_version to 2.  We could probably get away with just defaulting
-   * to 1.02, but there may still be some decoders in use that will complain
-   * about that; saying 1.01 should minimize compatibility problems.
-   */
-  cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
-  cinfo->JFIF_minor_version = 1;
-  cinfo->density_unit = 0;	/* Pixel size is unknown by default */
-  cinfo->X_density = 1;		/* Pixel aspect ratio is square by default */
-  cinfo->Y_density = 1;
-
-  /* Choose JPEG colorspace based on input space, set defaults accordingly */
-
-  jpeg_default_colorspace(cinfo);
-}
-
-
-/*
- * Select an appropriate JPEG colorspace for in_color_space.
- */
-
-GLOBAL(void)
-jpeg_default_colorspace (j_compress_ptr cinfo)
-{
-  switch (cinfo->in_color_space) {
-  case JCS_GRAYSCALE:
-    jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
-    break;
-  case JCS_RGB:
-    jpeg_set_colorspace(cinfo, JCS_YCbCr);
-    break;
-  case JCS_YCbCr:
-    jpeg_set_colorspace(cinfo, JCS_YCbCr);
-    break;
-  case JCS_CMYK:
-    jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
-    break;
-  case JCS_YCCK:
-    jpeg_set_colorspace(cinfo, JCS_YCCK);
-    break;
-  case JCS_UNKNOWN:
-    jpeg_set_colorspace(cinfo, JCS_UNKNOWN);
-    break;
-  default:
-    ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
-  }
-}
-
-
-/*
- * Set the JPEG colorspace, and choose colorspace-dependent default values.
- */
-
-GLOBAL(void)
-jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
-{
-  jpeg_component_info * compptr;
-  int ci;
-
-#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl)  \
-  (compptr = &cinfo->comp_info[index], \
-   compptr->component_id = (id), \
-   compptr->h_samp_factor = (hsamp), \
-   compptr->v_samp_factor = (vsamp), \
-   compptr->quant_tbl_no = (quant), \
-   compptr->dc_tbl_no = (dctbl), \
-   compptr->ac_tbl_no = (actbl) )
-
-  /* Safety check to ensure start_compress not called yet. */
-  if (cinfo->global_state != CSTATE_START)
-    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
-  /* For all colorspaces, we use Q and Huff tables 0 for luminance components,
-   * tables 1 for chrominance components.
-   */
-
-  cinfo->jpeg_color_space = colorspace;
-
-  cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
-  cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
-
-  switch (colorspace) {
-  case JCS_GRAYSCALE:
-    cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
-    cinfo->num_components = 1;
-    /* JFIF specifies component ID 1 */
-    SET_COMP(0, 1, 1,1, 0, 0,0);
-    break;
-  case JCS_RGB:
-    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
-    cinfo->num_components = 3;
-    SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
-    SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
-    SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
-    break;
-  case JCS_YCbCr:
-    cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
-    cinfo->num_components = 3;
-    /* JFIF specifies component IDs 1,2,3 */
-    /* We default to 2x2 subsamples of chrominance */
-    SET_COMP(0, 1, 2,2, 0, 0,0);
-    SET_COMP(1, 2, 1,1, 1, 1,1);
-    SET_COMP(2, 3, 1,1, 1, 1,1);
-    break;
-  case JCS_CMYK:
-    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
-    cinfo->num_components = 4;
-    SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
-    SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
-    SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
-    SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
-    break;
-  case JCS_YCCK:
-    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
-    cinfo->num_components = 4;
-    SET_COMP(0, 1, 2,2, 0, 0,0);
-    SET_COMP(1, 2, 1,1, 1, 1,1);
-    SET_COMP(2, 3, 1,1, 1, 1,1);
-    SET_COMP(3, 4, 2,2, 0, 0,0);
-    break;
-  case JCS_UNKNOWN:
-    cinfo->num_components = cinfo->input_components;
-    if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
-      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
-	       MAX_COMPONENTS);
-    for (ci = 0; ci < cinfo->num_components; ci++) {
-      SET_COMP(ci, ci, 1,1, 0, 0,0);
-    }
-    break;
-  default:
-    ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
-  }
-}
-
-
-#ifdef C_PROGRESSIVE_SUPPORTED
-
-LOCAL(jpeg_scan_info *)
-fill_a_scan (jpeg_scan_info * scanptr, int ci,
-	     int Ss, int Se, int Ah, int Al)
-/* Support routine: generate one scan for specified component */
-{
-  scanptr->comps_in_scan = 1;
-  scanptr->component_index[0] = ci;
-  scanptr->Ss = Ss;
-  scanptr->Se = Se;
-  scanptr->Ah = Ah;
-  scanptr->Al = Al;
-  scanptr++;
-  return scanptr;
-}
-
-LOCAL(jpeg_scan_info *)
-fill_scans (jpeg_scan_info * scanptr, int ncomps,
-	    int Ss, int Se, int Ah, int Al)
-/* Support routine: generate one scan for each component */
-{
-  int ci;
-
-  for (ci = 0; ci < ncomps; ci++) {
-    scanptr->comps_in_scan = 1;
-    scanptr->component_index[0] = ci;
-    scanptr->Ss = Ss;
-    scanptr->Se = Se;
-    scanptr->Ah = Ah;
-    scanptr->Al = Al;
-    scanptr++;
-  }
-  return scanptr;
-}
-
-LOCAL(jpeg_scan_info *)
-fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)
-/* Support routine: generate interleaved DC scan if possible, else N scans */
-{
-  int ci;
-
-  if (ncomps <= MAX_COMPS_IN_SCAN) {
-    /* Single interleaved DC scan */
-    scanptr->comps_in_scan = ncomps;
-    for (ci = 0; ci < ncomps; ci++)
-      scanptr->component_index[ci] = ci;
-    scanptr->Ss = scanptr->Se = 0;
-    scanptr->Ah = Ah;
-    scanptr->Al = Al;
-    scanptr++;
-  } else {
-    /* Noninterleaved DC scan for each component */
-    scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);
-  }
-  return scanptr;
-}
-
-
-/*
- * Create a recommended progressive-JPEG script.
- * cinfo->num_components and cinfo->jpeg_color_space must be correct.
- */
-
-GLOBAL(void)
-jpeg_simple_progression (j_compress_ptr cinfo)
-{
-  int ncomps = cinfo->num_components;
-  int nscans;
-  jpeg_scan_info * scanptr;
-
-  /* Safety check to ensure start_compress not called yet. */
-  if (cinfo->global_state != CSTATE_START)
-    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
-
-  /* Figure space needed for script.  Calculation must match code below! */
-  if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
-    /* Custom script for YCbCr color images. */
-    nscans = 10;
-  } else {
-    /* All-purpose script for other color spaces. */
-    if (ncomps > MAX_COMPS_IN_SCAN)
-      nscans = 6 * ncomps;	/* 2 DC + 4 AC scans per component */
-    else
-      nscans = 2 + 4 * ncomps;	/* 2 DC scans; 4 AC scans per component */
-  }
-
-  /* Allocate space for script.
-   * We need to put it in the permanent pool in case the application performs
-   * multiple compressions without changing the settings.  To avoid a memory
-   * leak if jpeg_simple_progression is called repeatedly for the same JPEG
-   * object, we try to re-use previously allocated space, and we allocate
-   * enough space to handle YCbCr even if initially asked for grayscale.
-   */
-  if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
-    cinfo->script_space_size = MAX(nscans, 10);
-    cinfo->script_space = (jpeg_scan_info *)
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
-			cinfo->script_space_size * SIZEOF(jpeg_scan_info));
-  }
-  scanptr = cinfo->script_space;
-  cinfo->scan_info = scanptr;
-  cinfo->num_scans = nscans;
-
-  if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
-    /* Custom script for YCbCr color images. */
-    /* Initial DC scan */
-    scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
-    /* Initial AC scan: get some luma data out in a hurry */
-    scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);
-    /* Chroma data is too small to be worth expending many scans on */
-    scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);
-    scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);
-    /* Complete spectral selection for luma AC */
-    scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);
-    /* Refine next bit of luma AC */
-    scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
-    /* Finish DC successive approximation */
-    scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
-    /* Finish AC successive approximation */
-    scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);
-    scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);
-    /* Luma bottom bit comes last since it's usually largest scan */
-    scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
-  } else {
-    /* All-purpose script for other color spaces. */
-    /* Successive approximation first pass */
-    scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
-    scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);
-    scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
-    /* Successive approximation second pass */
-    scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
-    /* Successive approximation final pass */
-    scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
-    scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
-  }
-}
-
-#endif /* C_PROGRESSIVE_SUPPORTED */
+/*

+ * jcparam.c

+ *

+ * Copyright (C) 1991-1998, Thomas G. Lane.

+ * Modified 2003-2012 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 optional default-setting code for the JPEG compressor.

+ * Applications do not have to use this file, but those that don't use it

+ * must know a lot more about the innards of the JPEG code.

+ */

+

+#define JPEG_INTERNALS

+#include "jinclude.h"

+#include "jpeglib.h"

+

+

+/*

+ * Quantization table setup routines

+ */

+

+GLOBAL(void)

+jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,

+		      const unsigned int *basic_table,

+		      int scale_factor, boolean force_baseline)

+/* Define a quantization table equal to the basic_table times

+ * a scale factor (given as a percentage).

+ * If force_baseline is TRUE, the computed quantization table entries

+ * are limited to 1..255 for JPEG baseline compatibility.

+ */

+{

+  JQUANT_TBL ** qtblptr;

+  int i;

+  long temp;

+

+  /* Safety check to ensure start_compress not called yet. */

+  if (cinfo->global_state != CSTATE_START)

+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

+

+  if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)

+    ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);

+

+  qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];

+

+  if (*qtblptr == NULL)

+    *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);

+

+  for (i = 0; i < DCTSIZE2; i++) {

+    temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;

+    /* limit the values to the valid range */

+    if (temp <= 0L) temp = 1L;

+    if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */

+    if (force_baseline && temp > 255L)

+      temp = 255L;		/* limit to baseline range if requested */

+    (*qtblptr)->quantval[i] = (UINT16) temp;

+  }

+

+  /* Initialize sent_table FALSE so table will be written to JPEG file. */

+  (*qtblptr)->sent_table = FALSE;

+}

+

+

+/* These are the sample quantization tables given in JPEG spec section K.1.

+ * The spec says that the values given produce "good" quality, and

+ * when divided by 2, "very good" quality.

+ */

+static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {

+  16,  11,  10,  16,  24,  40,  51,  61,

+  12,  12,  14,  19,  26,  58,  60,  55,

+  14,  13,  16,  24,  40,  57,  69,  56,

+  14,  17,  22,  29,  51,  87,  80,  62,

+  18,  22,  37,  56,  68, 109, 103,  77,

+  24,  35,  55,  64,  81, 104, 113,  92,

+  49,  64,  78,  87, 103, 121, 120, 101,

+  72,  92,  95,  98, 112, 100, 103,  99

+};

+static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {

+  17,  18,  24,  47,  99,  99,  99,  99,

+  18,  21,  26,  66,  99,  99,  99,  99,

+  24,  26,  56,  99,  99,  99,  99,  99,

+  47,  66,  99,  99,  99,  99,  99,  99,

+  99,  99,  99,  99,  99,  99,  99,  99,

+  99,  99,  99,  99,  99,  99,  99,  99,

+  99,  99,  99,  99,  99,  99,  99,  99,

+  99,  99,  99,  99,  99,  99,  99,  99

+};

+

+

+GLOBAL(void)

+jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)

+/* Set or change the 'quality' (quantization) setting, using default tables

+ * and straight percentage-scaling quality scales.

+ * This entry point allows different scalings for luminance and chrominance.

+ */

+{

+  /* Set up two quantization tables using the specified scaling */

+  jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,

+		       cinfo->q_scale_factor[0], force_baseline);

+  jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,

+		       cinfo->q_scale_factor[1], force_baseline);

+}

+

+

+GLOBAL(void)

+jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,

+			 boolean force_baseline)

+/* Set or change the 'quality' (quantization) setting, using default tables

+ * and a straight percentage-scaling quality scale.  In most cases it's better

+ * to use jpeg_set_quality (below); this entry point is provided for

+ * applications that insist on a linear percentage scaling.

+ */

+{

+  /* Set up two quantization tables using the specified scaling */

+  jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,

+		       scale_factor, force_baseline);

+  jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,

+		       scale_factor, force_baseline);

+}

+

+

+GLOBAL(int)

+jpeg_quality_scaling (int quality)

+/* Convert a user-specified quality rating to a percentage scaling factor

+ * for an underlying quantization table, using our recommended scaling curve.

+ * The input 'quality' factor should be 0 (terrible) to 100 (very good).

+ */

+{

+  /* Safety limit on quality factor.  Convert 0 to 1 to avoid zero divide. */

+  if (quality <= 0) quality = 1;

+  if (quality > 100) quality = 100;

+

+  /* The basic table is used as-is (scaling 100) for a quality of 50.

+   * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;

+   * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table

+   * to make all the table entries 1 (hence, minimum quantization loss).

+   * Qualities 1..50 are converted to scaling percentage 5000/Q.

+   */

+  if (quality < 50)

+    quality = 5000 / quality;

+  else

+    quality = 200 - quality*2;

+

+  return quality;

+}

+

+

+GLOBAL(void)

+jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)

+/* Set or change the 'quality' (quantization) setting, using default tables.

+ * This is the standard quality-adjusting entry point for typical user

+ * interfaces; only those who want detailed control over quantization tables

+ * would use the preceding routines directly.

+ */

+{

+  /* Convert user 0-100 rating to percentage scaling */

+  quality = jpeg_quality_scaling(quality);

+

+  /* Set up standard quality tables */

+  jpeg_set_linear_quality(cinfo, quality, force_baseline);

+}

+

+

+/*

+ * Huffman table setup routines

+ */

+

+LOCAL(void)

+add_huff_table (j_compress_ptr cinfo,

+		JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)

+/* Define a Huffman table */

+{

+  int nsymbols, len;

+

+  if (*htblptr == NULL)

+    *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);

+

+  /* Copy the number-of-symbols-of-each-code-length counts */

+  MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));

+

+  /* Validate the counts.  We do this here mainly so we can copy the right

+   * number of symbols from the val[] array, without risking marching off

+   * the end of memory.  jchuff.c will do a more thorough test later.

+   */

+  nsymbols = 0;

+  for (len = 1; len <= 16; len++)

+    nsymbols += bits[len];

+  if (nsymbols < 1 || nsymbols > 256)

+    ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);

+

+  MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));

+

+  /* Initialize sent_table FALSE so table will be written to JPEG file. */

+  (*htblptr)->sent_table = FALSE;

+}

+

+

+LOCAL(void)

+std_huff_tables (j_compress_ptr cinfo)

+/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */

+/* IMPORTANT: these are only valid for 8-bit data precision! */

+{

+  static const UINT8 bits_dc_luminance[17] =

+    { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };

+  static const UINT8 val_dc_luminance[] =

+    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

+  

+  static const UINT8 bits_dc_chrominance[17] =

+    { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };

+  static const UINT8 val_dc_chrominance[] =

+    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

+  

+  static const UINT8 bits_ac_luminance[17] =

+    { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };

+  static const UINT8 val_ac_luminance[] =

+    { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,

+      0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,

+      0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,

+      0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,

+      0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,

+      0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,

+      0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,

+      0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,

+      0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,

+      0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

+      0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

+      0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,

+      0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

+      0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,

+      0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,

+      0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,

+      0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,

+      0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,

+      0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,

+      0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

+      0xf9, 0xfa };

+  

+  static const UINT8 bits_ac_chrominance[17] =

+    { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };

+  static const UINT8 val_ac_chrominance[] =

+    { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,

+      0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,

+      0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,

+      0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,

+      0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,

+      0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,

+      0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,

+      0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,

+      0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,

+      0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,

+      0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,

+      0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

+      0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,

+      0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,

+      0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,

+      0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,

+      0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,

+      0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,

+      0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,

+      0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

+      0xf9, 0xfa };

+  

+  add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0],

+		 bits_dc_luminance, val_dc_luminance);

+  add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0],

+		 bits_ac_luminance, val_ac_luminance);

+  add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1],

+		 bits_dc_chrominance, val_dc_chrominance);

+  add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1],

+		 bits_ac_chrominance, val_ac_chrominance);

+}

+

+

+/*

+ * Default parameter setup for compression.

+ *

+ * Applications that don't choose to use this routine must do their

+ * own setup of all these parameters.  Alternately, you can call this

+ * to establish defaults and then alter parameters selectively.  This

+ * is the recommended approach since, if we add any new parameters,

+ * your code will still work (they'll be set to reasonable defaults).

+ */

+

+GLOBAL(void)

+jpeg_set_defaults (j_compress_ptr cinfo)

+{

+  int i;

+

+  /* Safety check to ensure start_compress not called yet. */

+  if (cinfo->global_state != CSTATE_START)

+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

+

+  /* Allocate comp_info array large enough for maximum component count.

+   * Array is made permanent in case application wants to compress

+   * multiple images at same param settings.

+   */

+  if (cinfo->comp_info == NULL)

+    cinfo->comp_info = (jpeg_component_info *)

+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

+				  MAX_COMPONENTS * SIZEOF(jpeg_component_info));

+

+  /* Initialize everything not dependent on the color space */

+

+  cinfo->scale_num = 1;		/* 1:1 scaling */

+  cinfo->scale_denom = 1;

+  cinfo->data_precision = BITS_IN_JSAMPLE;

+  /* Set up two quantization tables using default quality of 75 */

+  jpeg_set_quality(cinfo, 75, TRUE);

+  /* Set up two Huffman tables */

+  std_huff_tables(cinfo);

+

+  /* Initialize default arithmetic coding conditioning */

+  for (i = 0; i < NUM_ARITH_TBLS; i++) {

+    cinfo->arith_dc_L[i] = 0;

+    cinfo->arith_dc_U[i] = 1;

+    cinfo->arith_ac_K[i] = 5;

+  }

+

+  /* Default is no multiple-scan output */

+  cinfo->scan_info = NULL;

+  cinfo->num_scans = 0;

+

+  /* Expect normal source image, not raw downsampled data */

+  cinfo->raw_data_in = FALSE;

+

+  /* Use Huffman coding, not arithmetic coding, by default */

+  cinfo->arith_code = FALSE;

+

+  /* By default, don't do extra passes to optimize entropy coding */

+  cinfo->optimize_coding = FALSE;

+  /* The standard Huffman tables are only valid for 8-bit data precision.

+   * If the precision is higher, force optimization on so that usable

+   * tables will be computed.  This test can be removed if default tables

+   * are supplied that are valid for the desired precision.

+   */

+  if (cinfo->data_precision > 8)

+    cinfo->optimize_coding = TRUE;

+

+  /* By default, use the simpler non-cosited sampling alignment */

+  cinfo->CCIR601_sampling = FALSE;

+

+  /* By default, apply fancy downsampling */

+  cinfo->do_fancy_downsampling = TRUE;

+

+  /* No input smoothing */

+  cinfo->smoothing_factor = 0;

+

+  /* DCT algorithm preference */

+  cinfo->dct_method = JDCT_DEFAULT;

+

+  /* No restart markers */

+  cinfo->restart_interval = 0;

+  cinfo->restart_in_rows = 0;

+

+  /* Fill in default JFIF marker parameters.  Note that whether the marker

+   * will actually be written is determined by jpeg_set_colorspace.

+   *

+   * By default, the library emits JFIF version code 1.01.

+   * An application that wants to emit JFIF 1.02 extension markers should set

+   * JFIF_minor_version to 2.  We could probably get away with just defaulting

+   * to 1.02, but there may still be some decoders in use that will complain

+   * about that; saying 1.01 should minimize compatibility problems.

+   */

+  cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */

+  cinfo->JFIF_minor_version = 1;

+  cinfo->density_unit = 0;	/* Pixel size is unknown by default */

+  cinfo->X_density = 1;		/* Pixel aspect ratio is square by default */

+  cinfo->Y_density = 1;

+

+  /* No color transform */

+  cinfo->color_transform = JCT_NONE;

+

+  /* Choose JPEG colorspace based on input space, set defaults accordingly */

+

+  jpeg_default_colorspace(cinfo);

+}

+

+

+/*

+ * Select an appropriate JPEG colorspace for in_color_space.

+ */

+

+GLOBAL(void)

+jpeg_default_colorspace (j_compress_ptr cinfo)

+{

+  switch (cinfo->in_color_space) {

+  case JCS_GRAYSCALE:

+    jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);

+    break;

+  case JCS_RGB:

+    jpeg_set_colorspace(cinfo, JCS_YCbCr);

+    break;

+  case JCS_YCbCr:

+    jpeg_set_colorspace(cinfo, JCS_YCbCr);

+    break;

+  case JCS_CMYK:

+    jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */

+    break;

+  case JCS_YCCK:

+    jpeg_set_colorspace(cinfo, JCS_YCCK);

+    break;

+  case JCS_UNKNOWN:

+    jpeg_set_colorspace(cinfo, JCS_UNKNOWN);

+    break;

+  default:

+    ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);

+  }

+}

+

+

+/*

+ * Set the JPEG colorspace, and choose colorspace-dependent default values.

+ */

+

+GLOBAL(void)

+jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)

+{

+  jpeg_component_info * compptr;

+  int ci;

+

+#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl)  \

+  (compptr = &cinfo->comp_info[index], \

+   compptr->component_id = (id), \

+   compptr->h_samp_factor = (hsamp), \

+   compptr->v_samp_factor = (vsamp), \

+   compptr->quant_tbl_no = (quant), \

+   compptr->dc_tbl_no = (dctbl), \

+   compptr->ac_tbl_no = (actbl) )

+

+  /* Safety check to ensure start_compress not called yet. */

+  if (cinfo->global_state != CSTATE_START)

+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

+

+  /* For all colorspaces, we use Q and Huff tables 0 for luminance components,

+   * tables 1 for chrominance components.

+   */

+

+  cinfo->jpeg_color_space = colorspace;

+

+  cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */

+  cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */

+

+  switch (colorspace) {

+  case JCS_GRAYSCALE:

+    cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */

+    cinfo->num_components = 1;

+    /* JFIF specifies component ID 1 */

+    SET_COMP(0, 1, 1,1, 0, 0,0);

+    break;

+  case JCS_RGB:

+    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */

+    cinfo->num_components = 3;

+    SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);

+    SET_COMP(1, 0x47 /* 'G' */, 1,1, 0,

+		cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0,

+		cinfo->color_transform == JCT_SUBTRACT_GREEN ? 1 : 0);

+    SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);

+    break;

+  case JCS_YCbCr:

+    cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */

+    cinfo->num_components = 3;

+    /* JFIF specifies component IDs 1,2,3 */

+    /* We default to 2x2 subsamples of chrominance */

+    SET_COMP(0, 1, 2,2, 0, 0,0);

+    SET_COMP(1, 2, 1,1, 1, 1,1);

+    SET_COMP(2, 3, 1,1, 1, 1,1);

+    break;

+  case JCS_CMYK:

+    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */

+    cinfo->num_components = 4;

+    SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);

+    SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);

+    SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);

+    SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);

+    break;

+  case JCS_YCCK:

+    cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */

+    cinfo->num_components = 4;

+    SET_COMP(0, 1, 2,2, 0, 0,0);

+    SET_COMP(1, 2, 1,1, 1, 1,1);

+    SET_COMP(2, 3, 1,1, 1, 1,1);

+    SET_COMP(3, 4, 2,2, 0, 0,0);

+    break;

+  case JCS_UNKNOWN:

+    cinfo->num_components = cinfo->input_components;

+    if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)

+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,

+	       MAX_COMPONENTS);

+    for (ci = 0; ci < cinfo->num_components; ci++) {

+      SET_COMP(ci, ci, 1,1, 0, 0,0);

+    }

+    break;

+  default:

+    ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);

+  }

+}

+

+

+#ifdef C_PROGRESSIVE_SUPPORTED

+

+LOCAL(jpeg_scan_info *)

+fill_a_scan (jpeg_scan_info * scanptr, int ci,

+	     int Ss, int Se, int Ah, int Al)

+/* Support routine: generate one scan for specified component */

+{

+  scanptr->comps_in_scan = 1;

+  scanptr->component_index[0] = ci;

+  scanptr->Ss = Ss;

+  scanptr->Se = Se;

+  scanptr->Ah = Ah;

+  scanptr->Al = Al;

+  scanptr++;

+  return scanptr;

+}

+

+LOCAL(jpeg_scan_info *)

+fill_scans (jpeg_scan_info * scanptr, int ncomps,

+	    int Ss, int Se, int Ah, int Al)

+/* Support routine: generate one scan for each component */

+{

+  int ci;

+

+  for (ci = 0; ci < ncomps; ci++) {

+    scanptr->comps_in_scan = 1;

+    scanptr->component_index[0] = ci;

+    scanptr->Ss = Ss;

+    scanptr->Se = Se;

+    scanptr->Ah = Ah;

+    scanptr->Al = Al;

+    scanptr++;

+  }

+  return scanptr;

+}

+

+LOCAL(jpeg_scan_info *)

+fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)

+/* Support routine: generate interleaved DC scan if possible, else N scans */

+{

+  int ci;

+

+  if (ncomps <= MAX_COMPS_IN_SCAN) {

+    /* Single interleaved DC scan */

+    scanptr->comps_in_scan = ncomps;

+    for (ci = 0; ci < ncomps; ci++)

+      scanptr->component_index[ci] = ci;

+    scanptr->Ss = scanptr->Se = 0;

+    scanptr->Ah = Ah;

+    scanptr->Al = Al;

+    scanptr++;

+  } else {

+    /* Noninterleaved DC scan for each component */

+    scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);

+  }

+  return scanptr;

+}

+

+

+/*

+ * Create a recommended progressive-JPEG script.

+ * cinfo->num_components and cinfo->jpeg_color_space must be correct.

+ */

+

+GLOBAL(void)

+jpeg_simple_progression (j_compress_ptr cinfo)

+{

+  int ncomps = cinfo->num_components;

+  int nscans;

+  jpeg_scan_info * scanptr;

+

+  /* Safety check to ensure start_compress not called yet. */

+  if (cinfo->global_state != CSTATE_START)

+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);

+

+  /* Figure space needed for script.  Calculation must match code below! */

+  if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {

+    /* Custom script for YCbCr color images. */

+    nscans = 10;

+  } else {

+    /* All-purpose script for other color spaces. */

+    if (ncomps > MAX_COMPS_IN_SCAN)

+      nscans = 6 * ncomps;	/* 2 DC + 4 AC scans per component */

+    else

+      nscans = 2 + 4 * ncomps;	/* 2 DC scans; 4 AC scans per component */

+  }

+

+  /* Allocate space for script.

+   * We need to put it in the permanent pool in case the application performs

+   * multiple compressions without changing the settings.  To avoid a memory

+   * leak if jpeg_simple_progression is called repeatedly for the same JPEG

+   * object, we try to re-use previously allocated space, and we allocate

+   * enough space to handle YCbCr even if initially asked for grayscale.

+   */

+  if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {

+    cinfo->script_space_size = MAX(nscans, 10);

+    cinfo->script_space = (jpeg_scan_info *)

+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

+			cinfo->script_space_size * SIZEOF(jpeg_scan_info));

+  }

+  scanptr = cinfo->script_space;

+  cinfo->scan_info = scanptr;

+  cinfo->num_scans = nscans;

+

+  if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {

+    /* Custom script for YCbCr color images. */

+    /* Initial DC scan */

+    scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);

+    /* Initial AC scan: get some luma data out in a hurry */

+    scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);

+    /* Chroma data is too small to be worth expending many scans on */

+    scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);

+    scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);

+    /* Complete spectral selection for luma AC */

+    scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);

+    /* Refine next bit of luma AC */

+    scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);

+    /* Finish DC successive approximation */

+    scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);

+    /* Finish AC successive approximation */

+    scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);

+    scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);

+    /* Luma bottom bit comes last since it's usually largest scan */

+    scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);

+  } else {

+    /* All-purpose script for other color spaces. */

+    /* Successive approximation first pass */

+    scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);

+    scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);

+    scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);

+    /* Successive approximation second pass */

+    scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);

+    /* Successive approximation final pass */

+    scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);

+    scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);

+  }

+}

+

+#endif /* C_PROGRESSIVE_SUPPORTED */