libjpeg update

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

1 files changed, 858 insertions, 858 deletions

diff --git a/plugins/AdvaImg/src/LibJPEG/jcmaster.c b/plugins/AdvaImg/src/LibJPEG/jcmaster.c
index caf80a53b3..ef73194b8b 100644
--- a/plugins/AdvaImg/src/LibJPEG/jcmaster.c
+++ b/plugins/AdvaImg/src/LibJPEG/jcmaster.c
@@ -1,858 +1,858 @@
-/*
- * jcmaster.c
- *
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * Modified 2003-2011 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 master control logic for the JPEG compressor.
- * These routines are concerned with parameter validation, initial setup,
- * and inter-pass control (determining the number of passes and the work 
- * to be done in each pass).
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-/* Private state */
-
-typedef enum {
-	main_pass,		/* input data, also do first output step */
-	huff_opt_pass,		/* Huffman code optimization pass */
-	output_pass		/* data output pass */
-} c_pass_type;
-
-typedef struct {
-  struct jpeg_comp_master pub;	/* public fields */
-
-  c_pass_type pass_type;	/* the type of the current pass */
-
-  int pass_number;		/* # of passes completed */
-  int total_passes;		/* total # of passes needed */
-
-  int scan_number;		/* current index in scan_info[] */
-} my_comp_master;
-
-typedef my_comp_master * my_master_ptr;
-
-
-/*
- * Support routines that do various essential calculations.
- */
-
-/*
- * Compute JPEG image dimensions and related values.
- * NOTE: this is exported for possible use by application.
- * Hence it mustn't do anything that can't be done twice.
- */
-
-GLOBAL(void)
-jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
-/* Do computations that are needed before master selection phase */
-{
-#ifdef DCT_SCALING_SUPPORTED
-
-  /* Sanity check on input image dimensions to prevent overflow in
-   * following calculation.
-   * We do check jpeg_width and jpeg_height in initial_setup below,
-   * but image_width and image_height can come from arbitrary data,
-   * and we need some space for multiplication by block_size.
-   */
-  if (((long) cinfo->image_width >> 24) || ((long) cinfo->image_height >> 24))
-    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
-
-  /* Compute actual JPEG image dimensions and DCT scaling choices. */
-  if (cinfo->scale_num >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/1 scaling */
-    cinfo->jpeg_width = cinfo->image_width * cinfo->block_size;
-    cinfo->jpeg_height = cinfo->image_height * cinfo->block_size;
-    cinfo->min_DCT_h_scaled_size = 1;
-    cinfo->min_DCT_v_scaled_size = 1;
-  } else if (cinfo->scale_num * 2 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/2 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 2L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 2L);
-    cinfo->min_DCT_h_scaled_size = 2;
-    cinfo->min_DCT_v_scaled_size = 2;
-  } else if (cinfo->scale_num * 3 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/3 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 3L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 3L);
-    cinfo->min_DCT_h_scaled_size = 3;
-    cinfo->min_DCT_v_scaled_size = 3;
-  } else if (cinfo->scale_num * 4 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/4 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 4L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 4L);
-    cinfo->min_DCT_h_scaled_size = 4;
-    cinfo->min_DCT_v_scaled_size = 4;
-  } else if (cinfo->scale_num * 5 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/5 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 5L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 5L);
-    cinfo->min_DCT_h_scaled_size = 5;
-    cinfo->min_DCT_v_scaled_size = 5;
-  } else if (cinfo->scale_num * 6 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/6 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 6L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 6L);
-    cinfo->min_DCT_h_scaled_size = 6;
-    cinfo->min_DCT_v_scaled_size = 6;
-  } else if (cinfo->scale_num * 7 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/7 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 7L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 7L);
-    cinfo->min_DCT_h_scaled_size = 7;
-    cinfo->min_DCT_v_scaled_size = 7;
-  } else if (cinfo->scale_num * 8 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/8 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 8L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 8L);
-    cinfo->min_DCT_h_scaled_size = 8;
-    cinfo->min_DCT_v_scaled_size = 8;
-  } else if (cinfo->scale_num * 9 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/9 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 9L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 9L);
-    cinfo->min_DCT_h_scaled_size = 9;
-    cinfo->min_DCT_v_scaled_size = 9;
-  } else if (cinfo->scale_num * 10 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/10 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 10L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 10L);
-    cinfo->min_DCT_h_scaled_size = 10;
-    cinfo->min_DCT_v_scaled_size = 10;
-  } else if (cinfo->scale_num * 11 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/11 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 11L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 11L);
-    cinfo->min_DCT_h_scaled_size = 11;
-    cinfo->min_DCT_v_scaled_size = 11;
-  } else if (cinfo->scale_num * 12 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/12 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 12L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 12L);
-    cinfo->min_DCT_h_scaled_size = 12;
-    cinfo->min_DCT_v_scaled_size = 12;
-  } else if (cinfo->scale_num * 13 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/13 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 13L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 13L);
-    cinfo->min_DCT_h_scaled_size = 13;
-    cinfo->min_DCT_v_scaled_size = 13;
-  } else if (cinfo->scale_num * 14 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/14 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 14L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 14L);
-    cinfo->min_DCT_h_scaled_size = 14;
-    cinfo->min_DCT_v_scaled_size = 14;
-  } else if (cinfo->scale_num * 15 >= cinfo->scale_denom * cinfo->block_size) {
-    /* Provide block_size/15 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 15L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 15L);
-    cinfo->min_DCT_h_scaled_size = 15;
-    cinfo->min_DCT_v_scaled_size = 15;
-  } else {
-    /* Provide block_size/16 scaling */
-    cinfo->jpeg_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 16L);
-    cinfo->jpeg_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 16L);
-    cinfo->min_DCT_h_scaled_size = 16;
-    cinfo->min_DCT_v_scaled_size = 16;
-  }
-
-#else /* !DCT_SCALING_SUPPORTED */
-
-  /* Hardwire it to "no scaling" */
-  cinfo->jpeg_width = cinfo->image_width;
-  cinfo->jpeg_height = cinfo->image_height;
-  cinfo->min_DCT_h_scaled_size = DCTSIZE;
-  cinfo->min_DCT_v_scaled_size = DCTSIZE;
-
-#endif /* DCT_SCALING_SUPPORTED */
-}
-
-
-LOCAL(void)
-jpeg_calc_trans_dimensions (j_compress_ptr cinfo)
-{
-  if (cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size)
-    ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
-	     cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size);
-
-  cinfo->block_size = cinfo->min_DCT_h_scaled_size;
-}
-
-
-LOCAL(void)
-initial_setup (j_compress_ptr cinfo, boolean transcode_only)
-/* Do computations that are needed before master selection phase */
-{
-  int ci, ssize;
-  jpeg_component_info *compptr;
-  long samplesperrow;
-  JDIMENSION jd_samplesperrow;
-
-  if (transcode_only)
-    jpeg_calc_trans_dimensions(cinfo);
-  else
-    jpeg_calc_jpeg_dimensions(cinfo);
-
-  /* Sanity check on block_size */
-  if (cinfo->block_size < 1 || cinfo->block_size > 16)
-    ERREXIT2(cinfo, JERR_BAD_DCTSIZE, cinfo->block_size, cinfo->block_size);
-
-  /* Derive natural_order from block_size */
-  switch (cinfo->block_size) {
-  case 2: cinfo->natural_order = jpeg_natural_order2; break;
-  case 3: cinfo->natural_order = jpeg_natural_order3; break;
-  case 4: cinfo->natural_order = jpeg_natural_order4; break;
-  case 5: cinfo->natural_order = jpeg_natural_order5; break;
-  case 6: cinfo->natural_order = jpeg_natural_order6; break;
-  case 7: cinfo->natural_order = jpeg_natural_order7; break;
-  default: cinfo->natural_order = jpeg_natural_order; break;
-  }
-
-  /* Derive lim_Se from block_size */
-  cinfo->lim_Se = cinfo->block_size < DCTSIZE ?
-    cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1;
-
-  /* Sanity check on image dimensions */
-  if (cinfo->jpeg_height <= 0 || cinfo->jpeg_width <= 0 ||
-      cinfo->num_components <= 0 || cinfo->input_components <= 0)
-    ERREXIT(cinfo, JERR_EMPTY_IMAGE);
-
-  /* Make sure image isn't bigger than I can handle */
-  if ((long) cinfo->jpeg_height > (long) JPEG_MAX_DIMENSION ||
-      (long) cinfo->jpeg_width > (long) JPEG_MAX_DIMENSION)
-    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
-
-  /* Width of an input scanline must be representable as JDIMENSION. */
-  samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;
-  jd_samplesperrow = (JDIMENSION) samplesperrow;
-  if ((long) jd_samplesperrow != samplesperrow)
-    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
-
-  /* For now, precision must match compiled-in value... */
-  if (cinfo->data_precision != BITS_IN_JSAMPLE)
-    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
-
-  /* Check that number of components won't exceed internal array sizes */
-  if (cinfo->num_components > MAX_COMPONENTS)
-    ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
-	     MAX_COMPONENTS);
-
-  /* Compute maximum sampling factors; check factor validity */
-  cinfo->max_h_samp_factor = 1;
-  cinfo->max_v_samp_factor = 1;
-  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-       ci++, compptr++) {
-    if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
-	compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
-      ERREXIT(cinfo, JERR_BAD_SAMPLING);
-    cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
-				   compptr->h_samp_factor);
-    cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
-				   compptr->v_samp_factor);
-  }
-
-  /* Compute dimensions of components */
-  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-       ci++, compptr++) {
-    /* Fill in the correct component_index value; don't rely on application */
-    compptr->component_index = ci;
-    /* In selecting the actual DCT scaling for each component, we try to
-     * scale down the chroma components via DCT scaling rather than downsampling.
-     * This saves time if the downsampler gets to use 1:1 scaling.
-     * Note this code adapts subsampling ratios which are powers of 2.
-     */
-    ssize = 1;
-#ifdef DCT_SCALING_SUPPORTED
-    while (cinfo->min_DCT_h_scaled_size * ssize <=
-	   (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&
-	   (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) {
-      ssize = ssize * 2;
-    }
-#endif
-    compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize;
-    ssize = 1;
-#ifdef DCT_SCALING_SUPPORTED
-    while (cinfo->min_DCT_v_scaled_size * ssize <=
-	   (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&
-	   (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) {
-      ssize = ssize * 2;
-    }
-#endif
-    compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize;
-
-    /* We don't support DCT ratios larger than 2. */
-    if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2)
-	compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2;
-    else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2)
-	compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2;
-
-    /* Size in DCT blocks */
-    compptr->width_in_blocks = (JDIMENSION)
-      jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor,
-		    (long) (cinfo->max_h_samp_factor * cinfo->block_size));
-    compptr->height_in_blocks = (JDIMENSION)
-      jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor,
-		    (long) (cinfo->max_v_samp_factor * cinfo->block_size));
-    /* Size in samples */
-    compptr->downsampled_width = (JDIMENSION)
-      jdiv_round_up((long) cinfo->jpeg_width *
-		    (long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),
-		    (long) (cinfo->max_h_samp_factor * cinfo->block_size));
-    compptr->downsampled_height = (JDIMENSION)
-      jdiv_round_up((long) cinfo->jpeg_height *
-		    (long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),
-		    (long) (cinfo->max_v_samp_factor * cinfo->block_size));
-    /* Mark component needed (this flag isn't actually used for compression) */
-    compptr->component_needed = TRUE;
-  }
-
-  /* Compute number of fully interleaved MCU rows (number of times that
-   * main controller will call coefficient controller).
-   */
-  cinfo->total_iMCU_rows = (JDIMENSION)
-    jdiv_round_up((long) cinfo->jpeg_height,
-		  (long) (cinfo->max_v_samp_factor * cinfo->block_size));
-}
-
-
-#ifdef C_MULTISCAN_FILES_SUPPORTED
-
-LOCAL(void)
-validate_script (j_compress_ptr cinfo)
-/* Verify that the scan script in cinfo->scan_info[] is valid; also
- * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.
- */
-{
-  const jpeg_scan_info * scanptr;
-  int scanno, ncomps, ci, coefi, thisi;
-  int Ss, Se, Ah, Al;
-  boolean component_sent[MAX_COMPONENTS];
-#ifdef C_PROGRESSIVE_SUPPORTED
-  int * last_bitpos_ptr;
-  int last_bitpos[MAX_COMPONENTS][DCTSIZE2];
-  /* -1 until that coefficient has been seen; then last Al for it */
-#endif
-
-  if (cinfo->num_scans <= 0)
-    ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);
-
-  /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;
-   * for progressive JPEG, no scan can have this.
-   */
-  scanptr = cinfo->scan_info;
-  if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {
-#ifdef C_PROGRESSIVE_SUPPORTED
-    cinfo->progressive_mode = TRUE;
-    last_bitpos_ptr = & last_bitpos[0][0];
-    for (ci = 0; ci < cinfo->num_components; ci++) 
-      for (coefi = 0; coefi < DCTSIZE2; coefi++)
-	*last_bitpos_ptr++ = -1;
-#else
-    ERREXIT(cinfo, JERR_NOT_COMPILED);
-#endif
-  } else {
-    cinfo->progressive_mode = FALSE;
-    for (ci = 0; ci < cinfo->num_components; ci++) 
-      component_sent[ci] = FALSE;
-  }
-
-  for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {
-    /* Validate component indexes */
-    ncomps = scanptr->comps_in_scan;
-    if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)
-      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);
-    for (ci = 0; ci < ncomps; ci++) {
-      thisi = scanptr->component_index[ci];
-      if (thisi < 0 || thisi >= cinfo->num_components)
-	ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
-      /* Components must appear in SOF order within each scan */
-      if (ci > 0 && thisi <= scanptr->component_index[ci-1])
-	ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
-    }
-    /* Validate progression parameters */
-    Ss = scanptr->Ss;
-    Se = scanptr->Se;
-    Ah = scanptr->Ah;
-    Al = scanptr->Al;
-    if (cinfo->progressive_mode) {
-#ifdef C_PROGRESSIVE_SUPPORTED
-      /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that
-       * seems wrong: the upper bound ought to depend on data precision.
-       * Perhaps they really meant 0..N+1 for N-bit precision.
-       * Here we allow 0..10 for 8-bit data; Al larger than 10 results in
-       * out-of-range reconstructed DC values during the first DC scan,
-       * which might cause problems for some decoders.
-       */
-#if BITS_IN_JSAMPLE == 8
-#define MAX_AH_AL 10
-#else
-#define MAX_AH_AL 13
-#endif
-      if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||
-	  Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL)
-	ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-      if (Ss == 0) {
-	if (Se != 0)		/* DC and AC together not OK */
-	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-      } else {
-	if (ncomps != 1)	/* AC scans must be for only one component */
-	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-      }
-      for (ci = 0; ci < ncomps; ci++) {
-	last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];
-	if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */
-	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-	for (coefi = Ss; coefi <= Se; coefi++) {
-	  if (last_bitpos_ptr[coefi] < 0) {
-	    /* first scan of this coefficient */
-	    if (Ah != 0)
-	      ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-	  } else {
-	    /* not first scan */
-	    if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)
-	      ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-	  }
-	  last_bitpos_ptr[coefi] = Al;
-	}
-      }
-#endif
-    } else {
-      /* For sequential JPEG, all progression parameters must be these: */
-      if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
-	ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
-      /* Make sure components are not sent twice */
-      for (ci = 0; ci < ncomps; ci++) {
-	thisi = scanptr->component_index[ci];
-	if (component_sent[thisi])
-	  ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
-	component_sent[thisi] = TRUE;
-      }
-    }
-  }
-
-  /* Now verify that everything got sent. */
-  if (cinfo->progressive_mode) {
-#ifdef C_PROGRESSIVE_SUPPORTED
-    /* For progressive mode, we only check that at least some DC data
-     * got sent for each component; the spec does not require that all bits
-     * of all coefficients be transmitted.  Would it be wiser to enforce
-     * transmission of all coefficient bits??
-     */
-    for (ci = 0; ci < cinfo->num_components; ci++) {
-      if (last_bitpos[ci][0] < 0)
-	ERREXIT(cinfo, JERR_MISSING_DATA);
-    }
-#endif
-  } else {
-    for (ci = 0; ci < cinfo->num_components; ci++) {
-      if (! component_sent[ci])
-	ERREXIT(cinfo, JERR_MISSING_DATA);
-    }
-  }
-}
-
-
-LOCAL(void)
-reduce_script (j_compress_ptr cinfo)
-/* Adapt scan script for use with reduced block size;
- * assume that script has been validated before.
- */
-{
-  jpeg_scan_info * scanptr;
-  int idxout, idxin;
-
-  /* Circumvent const declaration for this function */
-  scanptr = (jpeg_scan_info *) cinfo->scan_info;
-  idxout = 0;
-
-  for (idxin = 0; idxin < cinfo->num_scans; idxin++) {
-    /* After skipping, idxout becomes smaller than idxin */
-    if (idxin != idxout)
-      /* Copy rest of data;
-       * note we stay in given chunk of allocated memory.
-       */
-      scanptr[idxout] = scanptr[idxin];
-    if (scanptr[idxout].Ss > cinfo->lim_Se)
-      /* Entire scan out of range - skip this entry */
-      continue;
-    if (scanptr[idxout].Se > cinfo->lim_Se)
-      /* Limit scan to end of block */
-      scanptr[idxout].Se = cinfo->lim_Se;
-    idxout++;
-  }
-
-  cinfo->num_scans = idxout;
-}
-
-#endif /* C_MULTISCAN_FILES_SUPPORTED */
-
-
-LOCAL(void)
-select_scan_parameters (j_compress_ptr cinfo)
-/* Set up the scan parameters for the current scan */
-{
-  int ci;
-
-#ifdef C_MULTISCAN_FILES_SUPPORTED
-  if (cinfo->scan_info != NULL) {
-    /* Prepare for current scan --- the script is already validated */
-    my_master_ptr master = (my_master_ptr) cinfo->master;
-    const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;
-
-    cinfo->comps_in_scan = scanptr->comps_in_scan;
-    for (ci = 0; ci < scanptr->comps_in_scan; ci++) {
-      cinfo->cur_comp_info[ci] =
-	&cinfo->comp_info[scanptr->component_index[ci]];
-    }
-    if (cinfo->progressive_mode) {
-      cinfo->Ss = scanptr->Ss;
-      cinfo->Se = scanptr->Se;
-      cinfo->Ah = scanptr->Ah;
-      cinfo->Al = scanptr->Al;
-      return;
-    }
-  }
-  else
-#endif
-  {
-    /* Prepare for single sequential-JPEG scan containing all components */
-    if (cinfo->num_components > MAX_COMPS_IN_SCAN)
-      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
-	       MAX_COMPS_IN_SCAN);
-    cinfo->comps_in_scan = cinfo->num_components;
-    for (ci = 0; ci < cinfo->num_components; ci++) {
-      cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
-    }
-  }
-  cinfo->Ss = 0;
-  cinfo->Se = cinfo->block_size * cinfo->block_size - 1;
-  cinfo->Ah = 0;
-  cinfo->Al = 0;
-}
-
-
-LOCAL(void)
-per_scan_setup (j_compress_ptr cinfo)
-/* Do computations that are needed before processing a JPEG scan */
-/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */
-{
-  int ci, mcublks, tmp;
-  jpeg_component_info *compptr;
-  
-  if (cinfo->comps_in_scan == 1) {
-    
-    /* Noninterleaved (single-component) scan */
-    compptr = cinfo->cur_comp_info[0];
-    
-    /* Overall image size in MCUs */
-    cinfo->MCUs_per_row = compptr->width_in_blocks;
-    cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
-    
-    /* For noninterleaved scan, always one block per MCU */
-    compptr->MCU_width = 1;
-    compptr->MCU_height = 1;
-    compptr->MCU_blocks = 1;
-    compptr->MCU_sample_width = compptr->DCT_h_scaled_size;
-    compptr->last_col_width = 1;
-    /* For noninterleaved scans, it is convenient to define last_row_height
-     * as the number of block rows present in the last iMCU row.
-     */
-    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
-    if (tmp == 0) tmp = compptr->v_samp_factor;
-    compptr->last_row_height = tmp;
-    
-    /* Prepare array describing MCU composition */
-    cinfo->blocks_in_MCU = 1;
-    cinfo->MCU_membership[0] = 0;
-    
-  } else {
-    
-    /* Interleaved (multi-component) scan */
-    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
-      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
-	       MAX_COMPS_IN_SCAN);
-    
-    /* Overall image size in MCUs */
-    cinfo->MCUs_per_row = (JDIMENSION)
-      jdiv_round_up((long) cinfo->jpeg_width,
-		    (long) (cinfo->max_h_samp_factor * cinfo->block_size));
-    cinfo->MCU_rows_in_scan = (JDIMENSION)
-      jdiv_round_up((long) cinfo->jpeg_height,
-		    (long) (cinfo->max_v_samp_factor * cinfo->block_size));
-    
-    cinfo->blocks_in_MCU = 0;
-    
-    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
-      compptr = cinfo->cur_comp_info[ci];
-      /* Sampling factors give # of blocks of component in each MCU */
-      compptr->MCU_width = compptr->h_samp_factor;
-      compptr->MCU_height = compptr->v_samp_factor;
-      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
-      compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_h_scaled_size;
-      /* Figure number of non-dummy blocks in last MCU column & row */
-      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
-      if (tmp == 0) tmp = compptr->MCU_width;
-      compptr->last_col_width = tmp;
-      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
-      if (tmp == 0) tmp = compptr->MCU_height;
-      compptr->last_row_height = tmp;
-      /* Prepare array describing MCU composition */
-      mcublks = compptr->MCU_blocks;
-      if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)
-	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
-      while (mcublks-- > 0) {
-	cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
-      }
-    }
-    
-  }
-
-  /* Convert restart specified in rows to actual MCU count. */
-  /* Note that count must fit in 16 bits, so we provide limiting. */
-  if (cinfo->restart_in_rows > 0) {
-    long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;
-    cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);
-  }
-}
-
-
-/*
- * Per-pass setup.
- * This is called at the beginning of each pass.  We determine which modules
- * will be active during this pass and give them appropriate start_pass calls.
- * We also set is_last_pass to indicate whether any more passes will be
- * required.
- */
-
-METHODDEF(void)
-prepare_for_pass (j_compress_ptr cinfo)
-{
-  my_master_ptr master = (my_master_ptr) cinfo->master;
-
-  switch (master->pass_type) {
-  case main_pass:
-    /* Initial pass: will collect input data, and do either Huffman
-     * optimization or data output for the first scan.
-     */
-    select_scan_parameters(cinfo);
-    per_scan_setup(cinfo);
-    if (! cinfo->raw_data_in) {
-      (*cinfo->cconvert->start_pass) (cinfo);
-      (*cinfo->downsample->start_pass) (cinfo);
-      (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);
-    }
-    (*cinfo->fdct->start_pass) (cinfo);
-    (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);
-    (*cinfo->coef->start_pass) (cinfo,
-				(master->total_passes > 1 ?
-				 JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
-    (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
-    if (cinfo->optimize_coding) {
-      /* No immediate data output; postpone writing frame/scan headers */
-      master->pub.call_pass_startup = FALSE;
-    } else {
-      /* Will write frame/scan headers at first jpeg_write_scanlines call */
-      master->pub.call_pass_startup = TRUE;
-    }
-    break;
-#ifdef ENTROPY_OPT_SUPPORTED
-  case huff_opt_pass:
-    /* Do Huffman optimization for a scan after the first one. */
-    select_scan_parameters(cinfo);
-    per_scan_setup(cinfo);
-    if (cinfo->Ss != 0 || cinfo->Ah == 0) {
-      (*cinfo->entropy->start_pass) (cinfo, TRUE);
-      (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
-      master->pub.call_pass_startup = FALSE;
-      break;
-    }
-    /* Special case: Huffman DC refinement scans need no Huffman table
-     * and therefore we can skip the optimization pass for them.
-     */
-    master->pass_type = output_pass;
-    master->pass_number++;
-    /*FALLTHROUGH*/
-#endif
-  case output_pass:
-    /* Do a data-output pass. */
-    /* We need not repeat per-scan setup if prior optimization pass did it. */
-    if (! cinfo->optimize_coding) {
-      select_scan_parameters(cinfo);
-      per_scan_setup(cinfo);
-    }
-    (*cinfo->entropy->start_pass) (cinfo, FALSE);
-    (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
-    /* We emit frame/scan headers now */
-    if (master->scan_number == 0)
-      (*cinfo->marker->write_frame_header) (cinfo);
-    (*cinfo->marker->write_scan_header) (cinfo);
-    master->pub.call_pass_startup = FALSE;
-    break;
-  default:
-    ERREXIT(cinfo, JERR_NOT_COMPILED);
-  }
-
-  master->pub.is_last_pass = (master->pass_number == master->total_passes-1);
-
-  /* Set up progress monitor's pass info if present */
-  if (cinfo->progress != NULL) {
-    cinfo->progress->completed_passes = master->pass_number;
-    cinfo->progress->total_passes = master->total_passes;
-  }
-}
-
-
-/*
- * Special start-of-pass hook.
- * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
- * In single-pass processing, we need this hook because we don't want to
- * write frame/scan headers during jpeg_start_compress; we want to let the
- * application write COM markers etc. between jpeg_start_compress and the
- * jpeg_write_scanlines loop.
- * In multi-pass processing, this routine is not used.
- */
-
-METHODDEF(void)
-pass_startup (j_compress_ptr cinfo)
-{
-  cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */
-
-  (*cinfo->marker->write_frame_header) (cinfo);
-  (*cinfo->marker->write_scan_header) (cinfo);
-}
-
-
-/*
- * Finish up at end of pass.
- */
-
-METHODDEF(void)
-finish_pass_master (j_compress_ptr cinfo)
-{
-  my_master_ptr master = (my_master_ptr) cinfo->master;
-
-  /* The entropy coder always needs an end-of-pass call,
-   * either to analyze statistics or to flush its output buffer.
-   */
-  (*cinfo->entropy->finish_pass) (cinfo);
-
-  /* Update state for next pass */
-  switch (master->pass_type) {
-  case main_pass:
-    /* next pass is either output of scan 0 (after optimization)
-     * or output of scan 1 (if no optimization).
-     */
-    master->pass_type = output_pass;
-    if (! cinfo->optimize_coding)
-      master->scan_number++;
-    break;
-  case huff_opt_pass:
-    /* next pass is always output of current scan */
-    master->pass_type = output_pass;
-    break;
-  case output_pass:
-    /* next pass is either optimization or output of next scan */
-    if (cinfo->optimize_coding)
-      master->pass_type = huff_opt_pass;
-    master->scan_number++;
-    break;
-  }
-
-  master->pass_number++;
-}
-
-
-/*
- * Initialize master compression control.
- */
-
-GLOBAL(void)
-jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
-{
-  my_master_ptr master;
-
-  master = (my_master_ptr)
-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-				  SIZEOF(my_comp_master));
-  cinfo->master = (struct jpeg_comp_master *) master;
-  master->pub.prepare_for_pass = prepare_for_pass;
-  master->pub.pass_startup = pass_startup;
-  master->pub.finish_pass = finish_pass_master;
-  master->pub.is_last_pass = FALSE;
-
-  /* Validate parameters, determine derived values */
-  initial_setup(cinfo, transcode_only);
-
-  if (cinfo->scan_info != NULL) {
-#ifdef C_MULTISCAN_FILES_SUPPORTED
-    validate_script(cinfo);
-    if (cinfo->block_size < DCTSIZE)
-      reduce_script(cinfo);
-#else
-    ERREXIT(cinfo, JERR_NOT_COMPILED);
-#endif
-  } else {
-    cinfo->progressive_mode = FALSE;
-    cinfo->num_scans = 1;
-  }
-
-  if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) &&
-      !cinfo->arith_code)			/*  TEMPORARY HACK ??? */
-    /* assume default tables no good for progressive or downscale mode */
-    cinfo->optimize_coding = TRUE;
-
-  /* Initialize my private state */
-  if (transcode_only) {
-    /* no main pass in transcoding */
-    if (cinfo->optimize_coding)
-      master->pass_type = huff_opt_pass;
-    else
-      master->pass_type = output_pass;
-  } else {
-    /* for normal compression, first pass is always this type: */
-    master->pass_type = main_pass;
-  }
-  master->scan_number = 0;
-  master->pass_number = 0;
-  if (cinfo->optimize_coding)
-    master->total_passes = cinfo->num_scans * 2;
-  else
-    master->total_passes = cinfo->num_scans;
-}
+/*

+ * jcmaster.c

+ *

+ * Copyright (C) 1991-1997, Thomas G. Lane.

+ * Modified 2003-2011 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 master control logic for the JPEG compressor.

+ * These routines are concerned with parameter validation, initial setup,

+ * and inter-pass control (determining the number of passes and the work 

+ * to be done in each pass).

+ */

+

+#define JPEG_INTERNALS

+#include "jinclude.h"

+#include "jpeglib.h"

+

+

+/* Private state */

+

+typedef enum {

+	main_pass,		/* input data, also do first output step */

+	huff_opt_pass,		/* Huffman code optimization pass */

+	output_pass		/* data output pass */

+} c_pass_type;

+

+typedef struct {

+  struct jpeg_comp_master pub;	/* public fields */

+

+  c_pass_type pass_type;	/* the type of the current pass */

+

+  int pass_number;		/* # of passes completed */

+  int total_passes;		/* total # of passes needed */

+

+  int scan_number;		/* current index in scan_info[] */

+} my_comp_master;

+

+typedef my_comp_master * my_master_ptr;

+

+

+/*

+ * Support routines that do various essential calculations.

+ */

+

+/*

+ * Compute JPEG image dimensions and related values.

+ * NOTE: this is exported for possible use by application.

+ * Hence it mustn't do anything that can't be done twice.

+ */

+

+GLOBAL(void)

+jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)

+/* Do computations that are needed before master selection phase */

+{

+#ifdef DCT_SCALING_SUPPORTED

+

+  /* Sanity check on input image dimensions to prevent overflow in

+   * following calculation.

+   * We do check jpeg_width and jpeg_height in initial_setup below,

+   * but image_width and image_height can come from arbitrary data,

+   * and we need some space for multiplication by block_size.

+   */

+  if (((long) cinfo->image_width >> 24) || ((long) cinfo->image_height >> 24))

+    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);

+

+  /* Compute actual JPEG image dimensions and DCT scaling choices. */

+  if (cinfo->scale_num >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/1 scaling */

+    cinfo->jpeg_width = cinfo->image_width * cinfo->block_size;

+    cinfo->jpeg_height = cinfo->image_height * cinfo->block_size;

+    cinfo->min_DCT_h_scaled_size = 1;

+    cinfo->min_DCT_v_scaled_size = 1;

+  } else if (cinfo->scale_num * 2 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/2 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 2L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 2L);

+    cinfo->min_DCT_h_scaled_size = 2;

+    cinfo->min_DCT_v_scaled_size = 2;

+  } else if (cinfo->scale_num * 3 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/3 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 3L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 3L);

+    cinfo->min_DCT_h_scaled_size = 3;

+    cinfo->min_DCT_v_scaled_size = 3;

+  } else if (cinfo->scale_num * 4 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/4 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 4L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 4L);

+    cinfo->min_DCT_h_scaled_size = 4;

+    cinfo->min_DCT_v_scaled_size = 4;

+  } else if (cinfo->scale_num * 5 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/5 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 5L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 5L);

+    cinfo->min_DCT_h_scaled_size = 5;

+    cinfo->min_DCT_v_scaled_size = 5;

+  } else if (cinfo->scale_num * 6 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/6 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 6L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 6L);

+    cinfo->min_DCT_h_scaled_size = 6;

+    cinfo->min_DCT_v_scaled_size = 6;

+  } else if (cinfo->scale_num * 7 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/7 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 7L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 7L);

+    cinfo->min_DCT_h_scaled_size = 7;

+    cinfo->min_DCT_v_scaled_size = 7;

+  } else if (cinfo->scale_num * 8 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/8 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 8L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 8L);

+    cinfo->min_DCT_h_scaled_size = 8;

+    cinfo->min_DCT_v_scaled_size = 8;

+  } else if (cinfo->scale_num * 9 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/9 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 9L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 9L);

+    cinfo->min_DCT_h_scaled_size = 9;

+    cinfo->min_DCT_v_scaled_size = 9;

+  } else if (cinfo->scale_num * 10 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/10 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 10L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 10L);

+    cinfo->min_DCT_h_scaled_size = 10;

+    cinfo->min_DCT_v_scaled_size = 10;

+  } else if (cinfo->scale_num * 11 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/11 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 11L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 11L);

+    cinfo->min_DCT_h_scaled_size = 11;

+    cinfo->min_DCT_v_scaled_size = 11;

+  } else if (cinfo->scale_num * 12 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/12 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 12L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 12L);

+    cinfo->min_DCT_h_scaled_size = 12;

+    cinfo->min_DCT_v_scaled_size = 12;

+  } else if (cinfo->scale_num * 13 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/13 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 13L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 13L);

+    cinfo->min_DCT_h_scaled_size = 13;

+    cinfo->min_DCT_v_scaled_size = 13;

+  } else if (cinfo->scale_num * 14 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/14 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 14L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 14L);

+    cinfo->min_DCT_h_scaled_size = 14;

+    cinfo->min_DCT_v_scaled_size = 14;

+  } else if (cinfo->scale_num * 15 >= cinfo->scale_denom * cinfo->block_size) {

+    /* Provide block_size/15 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 15L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 15L);

+    cinfo->min_DCT_h_scaled_size = 15;

+    cinfo->min_DCT_v_scaled_size = 15;

+  } else {

+    /* Provide block_size/16 scaling */

+    cinfo->jpeg_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 16L);

+    cinfo->jpeg_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 16L);

+    cinfo->min_DCT_h_scaled_size = 16;

+    cinfo->min_DCT_v_scaled_size = 16;

+  }

+

+#else /* !DCT_SCALING_SUPPORTED */

+

+  /* Hardwire it to "no scaling" */

+  cinfo->jpeg_width = cinfo->image_width;

+  cinfo->jpeg_height = cinfo->image_height;

+  cinfo->min_DCT_h_scaled_size = DCTSIZE;

+  cinfo->min_DCT_v_scaled_size = DCTSIZE;

+

+#endif /* DCT_SCALING_SUPPORTED */

+}

+

+

+LOCAL(void)

+jpeg_calc_trans_dimensions (j_compress_ptr cinfo)

+{

+  if (cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size)

+    ERREXIT2(cinfo, JERR_BAD_DCTSIZE,

+	     cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size);

+

+  cinfo->block_size = cinfo->min_DCT_h_scaled_size;

+}

+

+

+LOCAL(void)

+initial_setup (j_compress_ptr cinfo, boolean transcode_only)

+/* Do computations that are needed before master selection phase */

+{

+  int ci, ssize;

+  jpeg_component_info *compptr;

+  long samplesperrow;

+  JDIMENSION jd_samplesperrow;

+

+  if (transcode_only)

+    jpeg_calc_trans_dimensions(cinfo);

+  else

+    jpeg_calc_jpeg_dimensions(cinfo);

+

+  /* Sanity check on block_size */

+  if (cinfo->block_size < 1 || cinfo->block_size > 16)

+    ERREXIT2(cinfo, JERR_BAD_DCTSIZE, cinfo->block_size, cinfo->block_size);

+

+  /* Derive natural_order from block_size */

+  switch (cinfo->block_size) {

+  case 2: cinfo->natural_order = jpeg_natural_order2; break;

+  case 3: cinfo->natural_order = jpeg_natural_order3; break;

+  case 4: cinfo->natural_order = jpeg_natural_order4; break;

+  case 5: cinfo->natural_order = jpeg_natural_order5; break;

+  case 6: cinfo->natural_order = jpeg_natural_order6; break;

+  case 7: cinfo->natural_order = jpeg_natural_order7; break;

+  default: cinfo->natural_order = jpeg_natural_order; break;

+  }

+

+  /* Derive lim_Se from block_size */

+  cinfo->lim_Se = cinfo->block_size < DCTSIZE ?

+    cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1;

+

+  /* Sanity check on image dimensions */

+  if (cinfo->jpeg_height <= 0 || cinfo->jpeg_width <= 0 ||

+      cinfo->num_components <= 0 || cinfo->input_components <= 0)

+    ERREXIT(cinfo, JERR_EMPTY_IMAGE);

+

+  /* Make sure image isn't bigger than I can handle */

+  if ((long) cinfo->jpeg_height > (long) JPEG_MAX_DIMENSION ||

+      (long) cinfo->jpeg_width > (long) JPEG_MAX_DIMENSION)

+    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);

+

+  /* Width of an input scanline must be representable as JDIMENSION. */

+  samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;

+  jd_samplesperrow = (JDIMENSION) samplesperrow;

+  if ((long) jd_samplesperrow != samplesperrow)

+    ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);

+

+  /* For now, precision must match compiled-in value... */

+  if (cinfo->data_precision != BITS_IN_JSAMPLE)

+    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);

+

+  /* Check that number of components won't exceed internal array sizes */

+  if (cinfo->num_components > MAX_COMPONENTS)

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

+	     MAX_COMPONENTS);

+

+  /* Compute maximum sampling factors; check factor validity */

+  cinfo->max_h_samp_factor = 1;

+  cinfo->max_v_samp_factor = 1;

+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

+       ci++, compptr++) {

+    if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||

+	compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)

+      ERREXIT(cinfo, JERR_BAD_SAMPLING);

+    cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,

+				   compptr->h_samp_factor);

+    cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,

+				   compptr->v_samp_factor);

+  }

+

+  /* Compute dimensions of components */

+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

+       ci++, compptr++) {

+    /* Fill in the correct component_index value; don't rely on application */

+    compptr->component_index = ci;

+    /* In selecting the actual DCT scaling for each component, we try to

+     * scale down the chroma components via DCT scaling rather than downsampling.

+     * This saves time if the downsampler gets to use 1:1 scaling.

+     * Note this code adapts subsampling ratios which are powers of 2.

+     */

+    ssize = 1;

+#ifdef DCT_SCALING_SUPPORTED

+    while (cinfo->min_DCT_h_scaled_size * ssize <=

+	   (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&

+	   (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) {

+      ssize = ssize * 2;

+    }

+#endif

+    compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize;

+    ssize = 1;

+#ifdef DCT_SCALING_SUPPORTED

+    while (cinfo->min_DCT_v_scaled_size * ssize <=

+	   (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&

+	   (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) {

+      ssize = ssize * 2;

+    }

+#endif

+    compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize;

+

+    /* We don't support DCT ratios larger than 2. */

+    if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2)

+	compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2;

+    else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2)

+	compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2;

+

+    /* Size in DCT blocks */

+    compptr->width_in_blocks = (JDIMENSION)

+      jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor,

+		    (long) (cinfo->max_h_samp_factor * cinfo->block_size));

+    compptr->height_in_blocks = (JDIMENSION)

+      jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor,

+		    (long) (cinfo->max_v_samp_factor * cinfo->block_size));

+    /* Size in samples */

+    compptr->downsampled_width = (JDIMENSION)

+      jdiv_round_up((long) cinfo->jpeg_width *

+		    (long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),

+		    (long) (cinfo->max_h_samp_factor * cinfo->block_size));

+    compptr->downsampled_height = (JDIMENSION)

+      jdiv_round_up((long) cinfo->jpeg_height *

+		    (long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),

+		    (long) (cinfo->max_v_samp_factor * cinfo->block_size));

+    /* Mark component needed (this flag isn't actually used for compression) */

+    compptr->component_needed = TRUE;

+  }

+

+  /* Compute number of fully interleaved MCU rows (number of times that

+   * main controller will call coefficient controller).

+   */

+  cinfo->total_iMCU_rows = (JDIMENSION)

+    jdiv_round_up((long) cinfo->jpeg_height,

+		  (long) (cinfo->max_v_samp_factor * cinfo->block_size));

+}

+

+

+#ifdef C_MULTISCAN_FILES_SUPPORTED

+

+LOCAL(void)

+validate_script (j_compress_ptr cinfo)

+/* Verify that the scan script in cinfo->scan_info[] is valid; also

+ * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.

+ */

+{

+  const jpeg_scan_info * scanptr;

+  int scanno, ncomps, ci, coefi, thisi;

+  int Ss, Se, Ah, Al;

+  boolean component_sent[MAX_COMPONENTS];

+#ifdef C_PROGRESSIVE_SUPPORTED

+  int * last_bitpos_ptr;

+  int last_bitpos[MAX_COMPONENTS][DCTSIZE2];

+  /* -1 until that coefficient has been seen; then last Al for it */

+#endif

+

+  if (cinfo->num_scans <= 0)

+    ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);

+

+  /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;

+   * for progressive JPEG, no scan can have this.

+   */

+  scanptr = cinfo->scan_info;

+  if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {

+#ifdef C_PROGRESSIVE_SUPPORTED

+    cinfo->progressive_mode = TRUE;

+    last_bitpos_ptr = & last_bitpos[0][0];

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

+      for (coefi = 0; coefi < DCTSIZE2; coefi++)

+	*last_bitpos_ptr++ = -1;

+#else

+    ERREXIT(cinfo, JERR_NOT_COMPILED);

+#endif

+  } else {

+    cinfo->progressive_mode = FALSE;

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

+      component_sent[ci] = FALSE;

+  }

+

+  for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {

+    /* Validate component indexes */

+    ncomps = scanptr->comps_in_scan;

+    if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)

+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);

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

+      thisi = scanptr->component_index[ci];

+      if (thisi < 0 || thisi >= cinfo->num_components)

+	ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);

+      /* Components must appear in SOF order within each scan */

+      if (ci > 0 && thisi <= scanptr->component_index[ci-1])

+	ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);

+    }

+    /* Validate progression parameters */

+    Ss = scanptr->Ss;

+    Se = scanptr->Se;

+    Ah = scanptr->Ah;

+    Al = scanptr->Al;

+    if (cinfo->progressive_mode) {

+#ifdef C_PROGRESSIVE_SUPPORTED

+      /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that

+       * seems wrong: the upper bound ought to depend on data precision.

+       * Perhaps they really meant 0..N+1 for N-bit precision.

+       * Here we allow 0..10 for 8-bit data; Al larger than 10 results in

+       * out-of-range reconstructed DC values during the first DC scan,

+       * which might cause problems for some decoders.

+       */

+#if BITS_IN_JSAMPLE == 8

+#define MAX_AH_AL 10

+#else

+#define MAX_AH_AL 13

+#endif

+      if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||

+	  Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL)

+	ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+      if (Ss == 0) {

+	if (Se != 0)		/* DC and AC together not OK */

+	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+      } else {

+	if (ncomps != 1)	/* AC scans must be for only one component */

+	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+      }

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

+	last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];

+	if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */

+	  ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+	for (coefi = Ss; coefi <= Se; coefi++) {

+	  if (last_bitpos_ptr[coefi] < 0) {

+	    /* first scan of this coefficient */

+	    if (Ah != 0)

+	      ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+	  } else {

+	    /* not first scan */

+	    if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)

+	      ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+	  }

+	  last_bitpos_ptr[coefi] = Al;

+	}

+      }

+#endif

+    } else {

+      /* For sequential JPEG, all progression parameters must be these: */

+      if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)

+	ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);

+      /* Make sure components are not sent twice */

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

+	thisi = scanptr->component_index[ci];

+	if (component_sent[thisi])

+	  ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);

+	component_sent[thisi] = TRUE;

+      }

+    }

+  }

+

+  /* Now verify that everything got sent. */

+  if (cinfo->progressive_mode) {

+#ifdef C_PROGRESSIVE_SUPPORTED

+    /* For progressive mode, we only check that at least some DC data

+     * got sent for each component; the spec does not require that all bits

+     * of all coefficients be transmitted.  Would it be wiser to enforce

+     * transmission of all coefficient bits??

+     */

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

+      if (last_bitpos[ci][0] < 0)

+	ERREXIT(cinfo, JERR_MISSING_DATA);

+    }

+#endif

+  } else {

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

+      if (! component_sent[ci])

+	ERREXIT(cinfo, JERR_MISSING_DATA);

+    }

+  }

+}

+

+

+LOCAL(void)

+reduce_script (j_compress_ptr cinfo)

+/* Adapt scan script for use with reduced block size;

+ * assume that script has been validated before.

+ */

+{

+  jpeg_scan_info * scanptr;

+  int idxout, idxin;

+

+  /* Circumvent const declaration for this function */

+  scanptr = (jpeg_scan_info *) cinfo->scan_info;

+  idxout = 0;

+

+  for (idxin = 0; idxin < cinfo->num_scans; idxin++) {

+    /* After skipping, idxout becomes smaller than idxin */

+    if (idxin != idxout)

+      /* Copy rest of data;

+       * note we stay in given chunk of allocated memory.

+       */

+      scanptr[idxout] = scanptr[idxin];

+    if (scanptr[idxout].Ss > cinfo->lim_Se)

+      /* Entire scan out of range - skip this entry */

+      continue;

+    if (scanptr[idxout].Se > cinfo->lim_Se)

+      /* Limit scan to end of block */

+      scanptr[idxout].Se = cinfo->lim_Se;

+    idxout++;

+  }

+

+  cinfo->num_scans = idxout;

+}

+

+#endif /* C_MULTISCAN_FILES_SUPPORTED */

+

+

+LOCAL(void)

+select_scan_parameters (j_compress_ptr cinfo)

+/* Set up the scan parameters for the current scan */

+{

+  int ci;

+

+#ifdef C_MULTISCAN_FILES_SUPPORTED

+  if (cinfo->scan_info != NULL) {

+    /* Prepare for current scan --- the script is already validated */

+    my_master_ptr master = (my_master_ptr) cinfo->master;

+    const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;

+

+    cinfo->comps_in_scan = scanptr->comps_in_scan;

+    for (ci = 0; ci < scanptr->comps_in_scan; ci++) {

+      cinfo->cur_comp_info[ci] =

+	&cinfo->comp_info[scanptr->component_index[ci]];

+    }

+    if (cinfo->progressive_mode) {

+      cinfo->Ss = scanptr->Ss;

+      cinfo->Se = scanptr->Se;

+      cinfo->Ah = scanptr->Ah;

+      cinfo->Al = scanptr->Al;

+      return;

+    }

+  }

+  else

+#endif

+  {

+    /* Prepare for single sequential-JPEG scan containing all components */

+    if (cinfo->num_components > MAX_COMPS_IN_SCAN)

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

+	       MAX_COMPS_IN_SCAN);

+    cinfo->comps_in_scan = cinfo->num_components;

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

+      cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];

+    }

+  }

+  cinfo->Ss = 0;

+  cinfo->Se = cinfo->block_size * cinfo->block_size - 1;

+  cinfo->Ah = 0;

+  cinfo->Al = 0;

+}

+

+

+LOCAL(void)

+per_scan_setup (j_compress_ptr cinfo)

+/* Do computations that are needed before processing a JPEG scan */

+/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */

+{

+  int ci, mcublks, tmp;

+  jpeg_component_info *compptr;

+  

+  if (cinfo->comps_in_scan == 1) {

+    

+    /* Noninterleaved (single-component) scan */

+    compptr = cinfo->cur_comp_info[0];

+    

+    /* Overall image size in MCUs */

+    cinfo->MCUs_per_row = compptr->width_in_blocks;

+    cinfo->MCU_rows_in_scan = compptr->height_in_blocks;

+    

+    /* For noninterleaved scan, always one block per MCU */

+    compptr->MCU_width = 1;

+    compptr->MCU_height = 1;

+    compptr->MCU_blocks = 1;

+    compptr->MCU_sample_width = compptr->DCT_h_scaled_size;

+    compptr->last_col_width = 1;

+    /* For noninterleaved scans, it is convenient to define last_row_height

+     * as the number of block rows present in the last iMCU row.

+     */

+    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);

+    if (tmp == 0) tmp = compptr->v_samp_factor;

+    compptr->last_row_height = tmp;

+    

+    /* Prepare array describing MCU composition */

+    cinfo->blocks_in_MCU = 1;

+    cinfo->MCU_membership[0] = 0;

+    

+  } else {

+    

+    /* Interleaved (multi-component) scan */

+    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)

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

+	       MAX_COMPS_IN_SCAN);

+    

+    /* Overall image size in MCUs */

+    cinfo->MCUs_per_row = (JDIMENSION)

+      jdiv_round_up((long) cinfo->jpeg_width,

+		    (long) (cinfo->max_h_samp_factor * cinfo->block_size));

+    cinfo->MCU_rows_in_scan = (JDIMENSION)

+      jdiv_round_up((long) cinfo->jpeg_height,

+		    (long) (cinfo->max_v_samp_factor * cinfo->block_size));

+    

+    cinfo->blocks_in_MCU = 0;

+    

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

+      compptr = cinfo->cur_comp_info[ci];

+      /* Sampling factors give # of blocks of component in each MCU */

+      compptr->MCU_width = compptr->h_samp_factor;

+      compptr->MCU_height = compptr->v_samp_factor;

+      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;

+      compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_h_scaled_size;

+      /* Figure number of non-dummy blocks in last MCU column & row */

+      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);

+      if (tmp == 0) tmp = compptr->MCU_width;

+      compptr->last_col_width = tmp;

+      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);

+      if (tmp == 0) tmp = compptr->MCU_height;

+      compptr->last_row_height = tmp;

+      /* Prepare array describing MCU composition */

+      mcublks = compptr->MCU_blocks;

+      if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)

+	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);

+      while (mcublks-- > 0) {

+	cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;

+      }

+    }

+    

+  }

+

+  /* Convert restart specified in rows to actual MCU count. */

+  /* Note that count must fit in 16 bits, so we provide limiting. */

+  if (cinfo->restart_in_rows > 0) {

+    long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;

+    cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);

+  }

+}

+

+

+/*

+ * Per-pass setup.

+ * This is called at the beginning of each pass.  We determine which modules

+ * will be active during this pass and give them appropriate start_pass calls.

+ * We also set is_last_pass to indicate whether any more passes will be

+ * required.

+ */

+

+METHODDEF(void)

+prepare_for_pass (j_compress_ptr cinfo)

+{

+  my_master_ptr master = (my_master_ptr) cinfo->master;

+

+  switch (master->pass_type) {

+  case main_pass:

+    /* Initial pass: will collect input data, and do either Huffman

+     * optimization or data output for the first scan.

+     */

+    select_scan_parameters(cinfo);

+    per_scan_setup(cinfo);

+    if (! cinfo->raw_data_in) {

+      (*cinfo->cconvert->start_pass) (cinfo);

+      (*cinfo->downsample->start_pass) (cinfo);

+      (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);

+    }

+    (*cinfo->fdct->start_pass) (cinfo);

+    (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);

+    (*cinfo->coef->start_pass) (cinfo,

+				(master->total_passes > 1 ?

+				 JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));

+    (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);

+    if (cinfo->optimize_coding) {

+      /* No immediate data output; postpone writing frame/scan headers */

+      master->pub.call_pass_startup = FALSE;

+    } else {

+      /* Will write frame/scan headers at first jpeg_write_scanlines call */

+      master->pub.call_pass_startup = TRUE;

+    }

+    break;

+#ifdef ENTROPY_OPT_SUPPORTED

+  case huff_opt_pass:

+    /* Do Huffman optimization for a scan after the first one. */

+    select_scan_parameters(cinfo);

+    per_scan_setup(cinfo);

+    if (cinfo->Ss != 0 || cinfo->Ah == 0) {

+      (*cinfo->entropy->start_pass) (cinfo, TRUE);

+      (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);

+      master->pub.call_pass_startup = FALSE;

+      break;

+    }

+    /* Special case: Huffman DC refinement scans need no Huffman table

+     * and therefore we can skip the optimization pass for them.

+     */

+    master->pass_type = output_pass;

+    master->pass_number++;

+    /*FALLTHROUGH*/

+#endif

+  case output_pass:

+    /* Do a data-output pass. */

+    /* We need not repeat per-scan setup if prior optimization pass did it. */

+    if (! cinfo->optimize_coding) {

+      select_scan_parameters(cinfo);

+      per_scan_setup(cinfo);

+    }

+    (*cinfo->entropy->start_pass) (cinfo, FALSE);

+    (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);

+    /* We emit frame/scan headers now */

+    if (master->scan_number == 0)

+      (*cinfo->marker->write_frame_header) (cinfo);

+    (*cinfo->marker->write_scan_header) (cinfo);

+    master->pub.call_pass_startup = FALSE;

+    break;

+  default:

+    ERREXIT(cinfo, JERR_NOT_COMPILED);

+  }

+

+  master->pub.is_last_pass = (master->pass_number == master->total_passes-1);

+

+  /* Set up progress monitor's pass info if present */

+  if (cinfo->progress != NULL) {

+    cinfo->progress->completed_passes = master->pass_number;

+    cinfo->progress->total_passes = master->total_passes;

+  }

+}

+

+

+/*

+ * Special start-of-pass hook.

+ * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.

+ * In single-pass processing, we need this hook because we don't want to

+ * write frame/scan headers during jpeg_start_compress; we want to let the

+ * application write COM markers etc. between jpeg_start_compress and the

+ * jpeg_write_scanlines loop.

+ * In multi-pass processing, this routine is not used.

+ */

+

+METHODDEF(void)

+pass_startup (j_compress_ptr cinfo)

+{

+  cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */

+

+  (*cinfo->marker->write_frame_header) (cinfo);

+  (*cinfo->marker->write_scan_header) (cinfo);

+}

+

+

+/*

+ * Finish up at end of pass.

+ */

+

+METHODDEF(void)

+finish_pass_master (j_compress_ptr cinfo)

+{

+  my_master_ptr master = (my_master_ptr) cinfo->master;

+

+  /* The entropy coder always needs an end-of-pass call,

+   * either to analyze statistics or to flush its output buffer.

+   */

+  (*cinfo->entropy->finish_pass) (cinfo);

+

+  /* Update state for next pass */

+  switch (master->pass_type) {

+  case main_pass:

+    /* next pass is either output of scan 0 (after optimization)

+     * or output of scan 1 (if no optimization).

+     */

+    master->pass_type = output_pass;

+    if (! cinfo->optimize_coding)

+      master->scan_number++;

+    break;

+  case huff_opt_pass:

+    /* next pass is always output of current scan */

+    master->pass_type = output_pass;

+    break;

+  case output_pass:

+    /* next pass is either optimization or output of next scan */

+    if (cinfo->optimize_coding)

+      master->pass_type = huff_opt_pass;

+    master->scan_number++;

+    break;

+  }

+

+  master->pass_number++;

+}

+

+

+/*

+ * Initialize master compression control.

+ */

+

+GLOBAL(void)

+jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)

+{

+  my_master_ptr master;

+

+  master = (my_master_ptr)

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

+				  SIZEOF(my_comp_master));

+  cinfo->master = (struct jpeg_comp_master *) master;

+  master->pub.prepare_for_pass = prepare_for_pass;

+  master->pub.pass_startup = pass_startup;

+  master->pub.finish_pass = finish_pass_master;

+  master->pub.is_last_pass = FALSE;

+

+  /* Validate parameters, determine derived values */

+  initial_setup(cinfo, transcode_only);

+

+  if (cinfo->scan_info != NULL) {

+#ifdef C_MULTISCAN_FILES_SUPPORTED

+    validate_script(cinfo);

+    if (cinfo->block_size < DCTSIZE)

+      reduce_script(cinfo);

+#else

+    ERREXIT(cinfo, JERR_NOT_COMPILED);

+#endif

+  } else {

+    cinfo->progressive_mode = FALSE;

+    cinfo->num_scans = 1;

+  }

+

+  if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) &&

+      !cinfo->arith_code)			/*  TEMPORARY HACK ??? */

+    /* assume default tables no good for progressive or downscale mode */

+    cinfo->optimize_coding = TRUE;

+

+  /* Initialize my private state */

+  if (transcode_only) {

+    /* no main pass in transcoding */

+    if (cinfo->optimize_coding)

+      master->pass_type = huff_opt_pass;

+    else

+      master->pass_type = output_pass;

+  } else {

+    /* for normal compression, first pass is always this type: */

+    master->pass_type = main_pass;

+  }

+  master->scan_number = 0;

+  master->pass_number = 0;

+  if (cinfo->optimize_coding)

+    master->total_passes = cinfo->num_scans * 2;

+  else

+    master->total_passes = cinfo->num_scans;

+}