newlines fixed

git-svn-id: svn://svn.icculus.org/quake3/trunk@6 edf5b092-35ff-0310-97b2-ce42778d08ea

1 files changed, 519 insertions, 519 deletions

diff --git a/code/jpeg-6/jcsample.c b/code/jpeg-6/jcsample.c
index 06b18f4..bf0fb46 100755
--- a/code/jpeg-6/jcsample.c
+++ b/code/jpeg-6/jcsample.c
@@ -1,519 +1,519 @@
-/*

- * jcsample.c

- *

- * Copyright (C) 1991-1994, Thomas G. Lane.

- * 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 downsampling routines.

- *

- * Downsampling input data is counted in "row groups".  A row group

- * is defined to be max_v_samp_factor pixel rows of each component,

- * from which the downsampler produces v_samp_factor sample rows.

- * A single row group is processed in each call to the downsampler module.

- *

- * The downsampler is responsible for edge-expansion of its output data

- * to fill an integral number of DCT blocks horizontally.  The source buffer

- * may be modified if it is helpful for this purpose (the source buffer is

- * allocated wide enough to correspond to the desired output width).

- * The caller (the prep controller) is responsible for vertical padding.

- *

- * The downsampler may request "context rows" by setting need_context_rows

- * during startup.  In this case, the input arrays will contain at least

- * one row group's worth of pixels above and below the passed-in data;

- * the caller will create dummy rows at image top and bottom by replicating

- * the first or last real pixel row.

- *

- * An excellent reference for image resampling is

- *   Digital Image Warping, George Wolberg, 1990.

- *   Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.

- *

- * The downsampling algorithm used here is a simple average of the source

- * pixels covered by the output pixel.  The hi-falutin sampling literature

- * refers to this as a "box filter".  In general the characteristics of a box

- * filter are not very good, but for the specific cases we normally use (1:1

- * and 2:1 ratios) the box is equivalent to a "triangle filter" which is not

- * nearly so bad.  If you intend to use other sampling ratios, you'd be well

- * advised to improve this code.

- *

- * A simple input-smoothing capability is provided.  This is mainly intended

- * for cleaning up color-dithered GIF input files (if you find it inadequate,

- * we suggest using an external filtering program such as pnmconvol).  When

- * enabled, each input pixel P is replaced by a weighted sum of itself and its

- * eight neighbors.  P's weight is 1-8*SF and each neighbor's weight is SF,

- * where SF = (smoothing_factor / 1024).

- * Currently, smoothing is only supported for 2h2v sampling factors.

- */

-

-#define JPEG_INTERNALS

-#include "jinclude.h"

-#include "jpeglib.h"

-

-

-/* Pointer to routine to downsample a single component */

-typedef JMETHOD(void, downsample1_ptr,

-		(j_compress_ptr cinfo, jpeg_component_info * compptr,

-		 JSAMPARRAY input_data, JSAMPARRAY output_data));

-

-/* Private subobject */

-

-typedef struct {

-  struct jpeg_downsampler pub;	/* public fields */

-

-  /* Downsampling method pointers, one per component */

-  downsample1_ptr methods[MAX_COMPONENTS];

-} my_downsampler;

-

-typedef my_downsampler * my_downsample_ptr;

-

-

-/*

- * Initialize for a downsampling pass.

- */

-

-METHODDEF void

-start_pass_downsample (j_compress_ptr cinfo)

-{

-  /* no work for now */

-}

-

-

-/*

- * Expand a component horizontally from width input_cols to width output_cols,

- * by duplicating the rightmost samples.

- */

-

-LOCAL void

-expand_right_edge (JSAMPARRAY image_data, int num_rows,

-		   JDIMENSION input_cols, JDIMENSION output_cols)

-{

-  register JSAMPROW ptr;

-  register JSAMPLE pixval;

-  register int count;

-  int row;

-  int numcols = (int) (output_cols - input_cols);

-

-  if (numcols > 0) {

-    for (row = 0; row < num_rows; row++) {

-      ptr = image_data[row] + input_cols;

-      pixval = ptr[-1];		/* don't need GETJSAMPLE() here */

-      for (count = numcols; count > 0; count--)

-	*ptr++ = pixval;

-    }

-  }

-}

-

-

-/*

- * Do downsampling for a whole row group (all components).

- *

- * In this version we simply downsample each component independently.

- */

-

-METHODDEF void

-sep_downsample (j_compress_ptr cinfo,

-		JSAMPIMAGE input_buf, JDIMENSION in_row_index,

-		JSAMPIMAGE output_buf, JDIMENSION out_row_group_index)

-{

-  my_downsample_ptr downsample = (my_downsample_ptr) cinfo->downsample;

-  int ci;

-  jpeg_component_info * compptr;

-  JSAMPARRAY in_ptr, out_ptr;

-

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

-       ci++, compptr++) {

-    in_ptr = input_buf[ci] + in_row_index;

-    out_ptr = output_buf[ci] + (out_row_group_index * compptr->v_samp_factor);

-    (*downsample->methods[ci]) (cinfo, compptr, in_ptr, out_ptr);

-  }

-}

-

-

-/*

- * Downsample pixel values of a single component.

- * One row group is processed per call.

- * This version handles arbitrary integral sampling ratios, without smoothing.

- * Note that this version is not actually used for customary sampling ratios.

- */

-

-METHODDEF void

-int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,

-		JSAMPARRAY input_data, JSAMPARRAY output_data)

-{

-  int inrow, outrow, h_expand, v_expand, numpix, numpix2, h, v;

-  JDIMENSION outcol, outcol_h;	/* outcol_h == outcol*h_expand */

-  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;

-  JSAMPROW inptr, outptr;

-  INT32 outvalue;

-

-  h_expand = cinfo->max_h_samp_factor / compptr->h_samp_factor;

-  v_expand = cinfo->max_v_samp_factor / compptr->v_samp_factor;

-  numpix = h_expand * v_expand;

-  numpix2 = numpix/2;

-

-  /* Expand input data enough to let all the output samples be generated

-   * by the standard loop.  Special-casing padded output would be more

-   * efficient.

-   */

-  expand_right_edge(input_data, cinfo->max_v_samp_factor,

-		    cinfo->image_width, output_cols * h_expand);

-

-  inrow = 0;

-  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {

-    outptr = output_data[outrow];

-    for (outcol = 0, outcol_h = 0; outcol < output_cols;

-	 outcol++, outcol_h += h_expand) {

-      outvalue = 0;

-      for (v = 0; v < v_expand; v++) {

-	inptr = input_data[inrow+v] + outcol_h;

-	for (h = 0; h < h_expand; h++) {

-	  outvalue += (INT32) GETJSAMPLE(*inptr++);

-	}

-      }

-      *outptr++ = (JSAMPLE) ((outvalue + numpix2) / numpix);

-    }

-    inrow += v_expand;

-  }

-}

-

-

-/*

- * Downsample pixel values of a single component.

- * This version handles the special case of a full-size component,

- * without smoothing.

- */

-

-METHODDEF void

-fullsize_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,

-		     JSAMPARRAY input_data, JSAMPARRAY output_data)

-{

-  /* Copy the data */

-  jcopy_sample_rows(input_data, 0, output_data, 0,

-		    cinfo->max_v_samp_factor, cinfo->image_width);

-  /* Edge-expand */

-  expand_right_edge(output_data, cinfo->max_v_samp_factor,

-		    cinfo->image_width, compptr->width_in_blocks * DCTSIZE);

-}

-

-

-/*

- * Downsample pixel values of a single component.

- * This version handles the common case of 2:1 horizontal and 1:1 vertical,

- * without smoothing.

- *

- * A note about the "bias" calculations: when rounding fractional values to

- * integer, we do not want to always round 0.5 up to the next integer.

- * If we did that, we'd introduce a noticeable bias towards larger values.

- * Instead, this code is arranged so that 0.5 will be rounded up or down at

- * alternate pixel locations (a simple ordered dither pattern).

- */

-

-METHODDEF void

-h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,

-		 JSAMPARRAY input_data, JSAMPARRAY output_data)

-{

-  int outrow;

-  JDIMENSION outcol;

-  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;

-  register JSAMPROW inptr, outptr;

-  register int bias;

-

-  /* Expand input data enough to let all the output samples be generated

-   * by the standard loop.  Special-casing padded output would be more

-   * efficient.

-   */

-  expand_right_edge(input_data, cinfo->max_v_samp_factor,

-		    cinfo->image_width, output_cols * 2);

-

-  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {

-    outptr = output_data[outrow];

-    inptr = input_data[outrow];

-    bias = 0;			/* bias = 0,1,0,1,... for successive samples */

-    for (outcol = 0; outcol < output_cols; outcol++) {

-      *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr) + GETJSAMPLE(inptr[1])

-			      + bias) >> 1);

-      bias ^= 1;		/* 0=>1, 1=>0 */

-      inptr += 2;

-    }

-  }

-}

-

-

-/*

- * Downsample pixel values of a single component.

- * This version handles the standard case of 2:1 horizontal and 2:1 vertical,

- * without smoothing.

- */

-

-METHODDEF void

-h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,

-		 JSAMPARRAY input_data, JSAMPARRAY output_data)

-{

-  int inrow, outrow;

-  JDIMENSION outcol;

-  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;

-  register JSAMPROW inptr0, inptr1, outptr;

-  register int bias;

-

-  /* Expand input data enough to let all the output samples be generated

-   * by the standard loop.  Special-casing padded output would be more

-   * efficient.

-   */

-  expand_right_edge(input_data, cinfo->max_v_samp_factor,

-		    cinfo->image_width, output_cols * 2);

-

-  inrow = 0;

-  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {

-    outptr = output_data[outrow];

-    inptr0 = input_data[inrow];

-    inptr1 = input_data[inrow+1];

-    bias = 1;			/* bias = 1,2,1,2,... for successive samples */

-    for (outcol = 0; outcol < output_cols; outcol++) {

-      *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +

-			      GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1])

-			      + bias) >> 2);

-      bias ^= 3;		/* 1=>2, 2=>1 */

-      inptr0 += 2; inptr1 += 2;

-    }

-    inrow += 2;

-  }

-}

-

-

-#ifdef INPUT_SMOOTHING_SUPPORTED

-

-/*

- * Downsample pixel values of a single component.

- * This version handles the standard case of 2:1 horizontal and 2:1 vertical,

- * with smoothing.  One row of context is required.

- */

-

-METHODDEF void

-h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,

-			JSAMPARRAY input_data, JSAMPARRAY output_data)

-{

-  int inrow, outrow;

-  JDIMENSION colctr;

-  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;

-  register JSAMPROW inptr0, inptr1, above_ptr, below_ptr, outptr;

-  INT32 membersum, neighsum, memberscale, neighscale;

-

-  /* Expand input data enough to let all the output samples be generated

-   * by the standard loop.  Special-casing padded output would be more

-   * efficient.

-   */

-  expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,

-		    cinfo->image_width, output_cols * 2);

-

-  /* We don't bother to form the individual "smoothed" input pixel values;

-   * we can directly compute the output which is the average of the four

-   * smoothed values.  Each of the four member pixels contributes a fraction

-   * (1-8*SF) to its own smoothed image and a fraction SF to each of the three

-   * other smoothed pixels, therefore a total fraction (1-5*SF)/4 to the final

-   * output.  The four corner-adjacent neighbor pixels contribute a fraction

-   * SF to just one smoothed pixel, or SF/4 to the final output; while the

-   * eight edge-adjacent neighbors contribute SF to each of two smoothed

-   * pixels, or SF/2 overall.  In order to use integer arithmetic, these

-   * factors are scaled by 2^16 = 65536.

-   * Also recall that SF = smoothing_factor / 1024.

-   */

-

-  memberscale = 16384 - cinfo->smoothing_factor * 80; /* scaled (1-5*SF)/4 */

-  neighscale = cinfo->smoothing_factor * 16; /* scaled SF/4 */

-

-  inrow = 0;

-  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {

-    outptr = output_data[outrow];

-    inptr0 = input_data[inrow];

-    inptr1 = input_data[inrow+1];

-    above_ptr = input_data[inrow-1];

-    below_ptr = input_data[inrow+2];

-

-    /* Special case for first column: pretend column -1 is same as column 0 */

-    membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +

-		GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);

-    neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +

-	       GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +

-	       GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[2]) +

-	       GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[2]);

-    neighsum += neighsum;

-    neighsum += GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[2]) +

-		GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[2]);

-    membersum = membersum * memberscale + neighsum * neighscale;

-    *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);

-    inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;

-

-    for (colctr = output_cols - 2; colctr > 0; colctr--) {

-      /* sum of pixels directly mapped to this output element */

-      membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +

-		  GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);

-      /* sum of edge-neighbor pixels */

-      neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +

-		 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +

-		 GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[2]) +

-		 GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[2]);

-      /* The edge-neighbors count twice as much as corner-neighbors */

-      neighsum += neighsum;

-      /* Add in the corner-neighbors */

-      neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[2]) +

-		  GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[2]);

-      /* form final output scaled up by 2^16 */

-      membersum = membersum * memberscale + neighsum * neighscale;

-      /* round, descale and output it */

-      *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);

-      inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;

-    }

-

-    /* Special case for last column */

-    membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +

-		GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);

-    neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +

-	       GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +

-	       GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[1]) +

-	       GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[1]);

-    neighsum += neighsum;

-    neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[1]) +

-		GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[1]);

-    membersum = membersum * memberscale + neighsum * neighscale;

-    *outptr = (JSAMPLE) ((membersum + 32768) >> 16);

-

-    inrow += 2;

-  }

-}

-

-

-/*

- * Downsample pixel values of a single component.

- * This version handles the special case of a full-size component,

- * with smoothing.  One row of context is required.

- */

-

-METHODDEF void

-fullsize_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,

-			    JSAMPARRAY input_data, JSAMPARRAY output_data)

-{

-  int outrow;

-  JDIMENSION colctr;

-  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;

-  register JSAMPROW inptr, above_ptr, below_ptr, outptr;

-  INT32 membersum, neighsum, memberscale, neighscale;

-  int colsum, lastcolsum, nextcolsum;

-

-  /* Expand input data enough to let all the output samples be generated

-   * by the standard loop.  Special-casing padded output would be more

-   * efficient.

-   */

-  expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,

-		    cinfo->image_width, output_cols);

-

-  /* Each of the eight neighbor pixels contributes a fraction SF to the

-   * smoothed pixel, while the main pixel contributes (1-8*SF).  In order

-   * to use integer arithmetic, these factors are multiplied by 2^16 = 65536.

-   * Also recall that SF = smoothing_factor / 1024.

-   */

-

-  memberscale = 65536L - cinfo->smoothing_factor * 512L; /* scaled 1-8*SF */

-  neighscale = cinfo->smoothing_factor * 64; /* scaled SF */

-

-  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {

-    outptr = output_data[outrow];

-    inptr = input_data[outrow];

-    above_ptr = input_data[outrow-1];

-    below_ptr = input_data[outrow+1];

-

-    /* Special case for first column */

-    colsum = GETJSAMPLE(*above_ptr++) + GETJSAMPLE(*below_ptr++) +

-	     GETJSAMPLE(*inptr);

-    membersum = GETJSAMPLE(*inptr++);

-    nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +

-		 GETJSAMPLE(*inptr);

-    neighsum = colsum + (colsum - membersum) + nextcolsum;

-    membersum = membersum * memberscale + neighsum * neighscale;

-    *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);

-    lastcolsum = colsum; colsum = nextcolsum;

-

-    for (colctr = output_cols - 2; colctr > 0; colctr--) {

-      membersum = GETJSAMPLE(*inptr++);

-      above_ptr++; below_ptr++;

-      nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +

-		   GETJSAMPLE(*inptr);

-      neighsum = lastcolsum + (colsum - membersum) + nextcolsum;

-      membersum = membersum * memberscale + neighsum * neighscale;

-      *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);

-      lastcolsum = colsum; colsum = nextcolsum;

-    }

-

-    /* Special case for last column */

-    membersum = GETJSAMPLE(*inptr);

-    neighsum = lastcolsum + (colsum - membersum) + colsum;

-    membersum = membersum * memberscale + neighsum * neighscale;

-    *outptr = (JSAMPLE) ((membersum + 32768) >> 16);

-

-  }

-}

-

-#endif /* INPUT_SMOOTHING_SUPPORTED */

-

-

-/*

- * Module initialization routine for downsampling.

- * Note that we must select a routine for each component.

- */

-

-GLOBAL void

-jinit_downsampler (j_compress_ptr cinfo)

-{

-  my_downsample_ptr downsample;

-  int ci;

-  jpeg_component_info * compptr;

-  boolean smoothok = TRUE;

-

-  downsample = (my_downsample_ptr)

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

-				SIZEOF(my_downsampler));

-  cinfo->downsample = (struct jpeg_downsampler *) downsample;

-  downsample->pub.start_pass = start_pass_downsample;

-  downsample->pub.downsample = sep_downsample;

-  downsample->pub.need_context_rows = FALSE;

-

-  if (cinfo->CCIR601_sampling)

-    ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);

-

-  /* Verify we can handle the sampling factors, and set up method pointers */

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

-       ci++, compptr++) {

-    if (compptr->h_samp_factor == cinfo->max_h_samp_factor &&

-	compptr->v_samp_factor == cinfo->max_v_samp_factor) {

-#ifdef INPUT_SMOOTHING_SUPPORTED

-      if (cinfo->smoothing_factor) {

-	downsample->methods[ci] = fullsize_smooth_downsample;

-	downsample->pub.need_context_rows = TRUE;

-      } else

-#endif

-	downsample->methods[ci] = fullsize_downsample;

-    } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&

-	       compptr->v_samp_factor == cinfo->max_v_samp_factor) {

-      smoothok = FALSE;

-      downsample->methods[ci] = h2v1_downsample;

-    } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&

-	       compptr->v_samp_factor * 2 == cinfo->max_v_samp_factor) {

-#ifdef INPUT_SMOOTHING_SUPPORTED

-      if (cinfo->smoothing_factor) {

-	downsample->methods[ci] = h2v2_smooth_downsample;

-	downsample->pub.need_context_rows = TRUE;

-      } else

-#endif

-	downsample->methods[ci] = h2v2_downsample;

-    } else if ((cinfo->max_h_samp_factor % compptr->h_samp_factor) == 0 &&

-	       (cinfo->max_v_samp_factor % compptr->v_samp_factor) == 0) {

-      smoothok = FALSE;

-      downsample->methods[ci] = int_downsample;

-    } else

-      ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);

-  }

-

-#ifdef INPUT_SMOOTHING_SUPPORTED

-  if (cinfo->smoothing_factor && !smoothok)

-    TRACEMS(cinfo, 0, JTRC_SMOOTH_NOTIMPL);

-#endif

-}

+/*
+ * jcsample.c
+ *
+ * Copyright (C) 1991-1994, Thomas G. Lane.
+ * 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 downsampling routines.
+ *
+ * Downsampling input data is counted in "row groups".  A row group
+ * is defined to be max_v_samp_factor pixel rows of each component,
+ * from which the downsampler produces v_samp_factor sample rows.
+ * A single row group is processed in each call to the downsampler module.
+ *
+ * The downsampler is responsible for edge-expansion of its output data
+ * to fill an integral number of DCT blocks horizontally.  The source buffer
+ * may be modified if it is helpful for this purpose (the source buffer is
+ * allocated wide enough to correspond to the desired output width).
+ * The caller (the prep controller) is responsible for vertical padding.
+ *
+ * The downsampler may request "context rows" by setting need_context_rows
+ * during startup.  In this case, the input arrays will contain at least
+ * one row group's worth of pixels above and below the passed-in data;
+ * the caller will create dummy rows at image top and bottom by replicating
+ * the first or last real pixel row.
+ *
+ * An excellent reference for image resampling is
+ *   Digital Image Warping, George Wolberg, 1990.
+ *   Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
+ *
+ * The downsampling algorithm used here is a simple average of the source
+ * pixels covered by the output pixel.  The hi-falutin sampling literature
+ * refers to this as a "box filter".  In general the characteristics of a box
+ * filter are not very good, but for the specific cases we normally use (1:1
+ * and 2:1 ratios) the box is equivalent to a "triangle filter" which is not
+ * nearly so bad.  If you intend to use other sampling ratios, you'd be well
+ * advised to improve this code.
+ *
+ * A simple input-smoothing capability is provided.  This is mainly intended
+ * for cleaning up color-dithered GIF input files (if you find it inadequate,
+ * we suggest using an external filtering program such as pnmconvol).  When
+ * enabled, each input pixel P is replaced by a weighted sum of itself and its
+ * eight neighbors.  P's weight is 1-8*SF and each neighbor's weight is SF,
+ * where SF = (smoothing_factor / 1024).
+ * Currently, smoothing is only supported for 2h2v sampling factors.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Pointer to routine to downsample a single component */
+typedef JMETHOD(void, downsample1_ptr,
+		(j_compress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY output_data));
+
+/* Private subobject */
+
+typedef struct {
+  struct jpeg_downsampler pub;	/* public fields */
+
+  /* Downsampling method pointers, one per component */
+  downsample1_ptr methods[MAX_COMPONENTS];
+} my_downsampler;
+
+typedef my_downsampler * my_downsample_ptr;
+
+
+/*
+ * Initialize for a downsampling pass.
+ */
+
+METHODDEF void
+start_pass_downsample (j_compress_ptr cinfo)
+{
+  /* no work for now */
+}
+
+
+/*
+ * Expand a component horizontally from width input_cols to width output_cols,
+ * by duplicating the rightmost samples.
+ */
+
+LOCAL void
+expand_right_edge (JSAMPARRAY image_data, int num_rows,
+		   JDIMENSION input_cols, JDIMENSION output_cols)
+{
+  register JSAMPROW ptr;
+  register JSAMPLE pixval;
+  register int count;
+  int row;
+  int numcols = (int) (output_cols - input_cols);
+
+  if (numcols > 0) {
+    for (row = 0; row < num_rows; row++) {
+      ptr = image_data[row] + input_cols;
+      pixval = ptr[-1];		/* don't need GETJSAMPLE() here */
+      for (count = numcols; count > 0; count--)
+	*ptr++ = pixval;
+    }
+  }
+}
+
+
+/*
+ * Do downsampling for a whole row group (all components).
+ *
+ * In this version we simply downsample each component independently.
+ */
+
+METHODDEF void
+sep_downsample (j_compress_ptr cinfo,
+		JSAMPIMAGE input_buf, JDIMENSION in_row_index,
+		JSAMPIMAGE output_buf, JDIMENSION out_row_group_index)
+{
+  my_downsample_ptr downsample = (my_downsample_ptr) cinfo->downsample;
+  int ci;
+  jpeg_component_info * compptr;
+  JSAMPARRAY in_ptr, out_ptr;
+
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    in_ptr = input_buf[ci] + in_row_index;
+    out_ptr = output_buf[ci] + (out_row_group_index * compptr->v_samp_factor);
+    (*downsample->methods[ci]) (cinfo, compptr, in_ptr, out_ptr);
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * One row group is processed per call.
+ * This version handles arbitrary integral sampling ratios, without smoothing.
+ * Note that this version is not actually used for customary sampling ratios.
+ */
+
+METHODDEF void
+int_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int inrow, outrow, h_expand, v_expand, numpix, numpix2, h, v;
+  JDIMENSION outcol, outcol_h;	/* outcol_h == outcol*h_expand */
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  JSAMPROW inptr, outptr;
+  INT32 outvalue;
+
+  h_expand = cinfo->max_h_samp_factor / compptr->h_samp_factor;
+  v_expand = cinfo->max_v_samp_factor / compptr->v_samp_factor;
+  numpix = h_expand * v_expand;
+  numpix2 = numpix/2;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, output_cols * h_expand);
+
+  inrow = 0;
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    for (outcol = 0, outcol_h = 0; outcol < output_cols;
+	 outcol++, outcol_h += h_expand) {
+      outvalue = 0;
+      for (v = 0; v < v_expand; v++) {
+	inptr = input_data[inrow+v] + outcol_h;
+	for (h = 0; h < h_expand; h++) {
+	  outvalue += (INT32) GETJSAMPLE(*inptr++);
+	}
+      }
+      *outptr++ = (JSAMPLE) ((outvalue + numpix2) / numpix);
+    }
+    inrow += v_expand;
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the special case of a full-size component,
+ * without smoothing.
+ */
+
+METHODDEF void
+fullsize_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		     JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  /* Copy the data */
+  jcopy_sample_rows(input_data, 0, output_data, 0,
+		    cinfo->max_v_samp_factor, cinfo->image_width);
+  /* Edge-expand */
+  expand_right_edge(output_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, compptr->width_in_blocks * DCTSIZE);
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the common case of 2:1 horizontal and 1:1 vertical,
+ * without smoothing.
+ *
+ * A note about the "bias" calculations: when rounding fractional values to
+ * integer, we do not want to always round 0.5 up to the next integer.
+ * If we did that, we'd introduce a noticeable bias towards larger values.
+ * Instead, this code is arranged so that 0.5 will be rounded up or down at
+ * alternate pixel locations (a simple ordered dither pattern).
+ */
+
+METHODDEF void
+h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int outrow;
+  JDIMENSION outcol;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr, outptr;
+  register int bias;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, output_cols * 2);
+
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr = input_data[outrow];
+    bias = 0;			/* bias = 0,1,0,1,... for successive samples */
+    for (outcol = 0; outcol < output_cols; outcol++) {
+      *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr) + GETJSAMPLE(inptr[1])
+			      + bias) >> 1);
+      bias ^= 1;		/* 0=>1, 1=>0 */
+      inptr += 2;
+    }
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the standard case of 2:1 horizontal and 2:1 vertical,
+ * without smoothing.
+ */
+
+METHODDEF void
+h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+		 JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int inrow, outrow;
+  JDIMENSION outcol;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr0, inptr1, outptr;
+  register int bias;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data, cinfo->max_v_samp_factor,
+		    cinfo->image_width, output_cols * 2);
+
+  inrow = 0;
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr0 = input_data[inrow];
+    inptr1 = input_data[inrow+1];
+    bias = 1;			/* bias = 1,2,1,2,... for successive samples */
+    for (outcol = 0; outcol < output_cols; outcol++) {
+      *outptr++ = (JSAMPLE) ((GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+			      GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1])
+			      + bias) >> 2);
+      bias ^= 3;		/* 1=>2, 2=>1 */
+      inptr0 += 2; inptr1 += 2;
+    }
+    inrow += 2;
+  }
+}
+
+
+#ifdef INPUT_SMOOTHING_SUPPORTED
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the standard case of 2:1 horizontal and 2:1 vertical,
+ * with smoothing.  One row of context is required.
+ */
+
+METHODDEF void
+h2v2_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
+			JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int inrow, outrow;
+  JDIMENSION colctr;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr0, inptr1, above_ptr, below_ptr, outptr;
+  INT32 membersum, neighsum, memberscale, neighscale;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,
+		    cinfo->image_width, output_cols * 2);
+
+  /* We don't bother to form the individual "smoothed" input pixel values;
+   * we can directly compute the output which is the average of the four
+   * smoothed values.  Each of the four member pixels contributes a fraction
+   * (1-8*SF) to its own smoothed image and a fraction SF to each of the three
+   * other smoothed pixels, therefore a total fraction (1-5*SF)/4 to the final
+   * output.  The four corner-adjacent neighbor pixels contribute a fraction
+   * SF to just one smoothed pixel, or SF/4 to the final output; while the
+   * eight edge-adjacent neighbors contribute SF to each of two smoothed
+   * pixels, or SF/2 overall.  In order to use integer arithmetic, these
+   * factors are scaled by 2^16 = 65536.
+   * Also recall that SF = smoothing_factor / 1024.
+   */
+
+  memberscale = 16384 - cinfo->smoothing_factor * 80; /* scaled (1-5*SF)/4 */
+  neighscale = cinfo->smoothing_factor * 16; /* scaled SF/4 */
+
+  inrow = 0;
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr0 = input_data[inrow];
+    inptr1 = input_data[inrow+1];
+    above_ptr = input_data[inrow-1];
+    below_ptr = input_data[inrow+2];
+
+    /* Special case for first column: pretend column -1 is same as column 0 */
+    membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+		GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
+    neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
+	       GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
+	       GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[2]) +
+	       GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[2]);
+    neighsum += neighsum;
+    neighsum += GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[2]) +
+		GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[2]);
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+    inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;
+
+    for (colctr = output_cols - 2; colctr > 0; colctr--) {
+      /* sum of pixels directly mapped to this output element */
+      membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+		  GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
+      /* sum of edge-neighbor pixels */
+      neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
+		 GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
+		 GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[2]) +
+		 GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[2]);
+      /* The edge-neighbors count twice as much as corner-neighbors */
+      neighsum += neighsum;
+      /* Add in the corner-neighbors */
+      neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[2]) +
+		  GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[2]);
+      /* form final output scaled up by 2^16 */
+      membersum = membersum * memberscale + neighsum * neighscale;
+      /* round, descale and output it */
+      *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+      inptr0 += 2; inptr1 += 2; above_ptr += 2; below_ptr += 2;
+    }
+
+    /* Special case for last column */
+    membersum = GETJSAMPLE(*inptr0) + GETJSAMPLE(inptr0[1]) +
+		GETJSAMPLE(*inptr1) + GETJSAMPLE(inptr1[1]);
+    neighsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(above_ptr[1]) +
+	       GETJSAMPLE(*below_ptr) + GETJSAMPLE(below_ptr[1]) +
+	       GETJSAMPLE(inptr0[-1]) + GETJSAMPLE(inptr0[1]) +
+	       GETJSAMPLE(inptr1[-1]) + GETJSAMPLE(inptr1[1]);
+    neighsum += neighsum;
+    neighsum += GETJSAMPLE(above_ptr[-1]) + GETJSAMPLE(above_ptr[1]) +
+		GETJSAMPLE(below_ptr[-1]) + GETJSAMPLE(below_ptr[1]);
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr = (JSAMPLE) ((membersum + 32768) >> 16);
+
+    inrow += 2;
+  }
+}
+
+
+/*
+ * Downsample pixel values of a single component.
+ * This version handles the special case of a full-size component,
+ * with smoothing.  One row of context is required.
+ */
+
+METHODDEF void
+fullsize_smooth_downsample (j_compress_ptr cinfo, jpeg_component_info *compptr,
+			    JSAMPARRAY input_data, JSAMPARRAY output_data)
+{
+  int outrow;
+  JDIMENSION colctr;
+  JDIMENSION output_cols = compptr->width_in_blocks * DCTSIZE;
+  register JSAMPROW inptr, above_ptr, below_ptr, outptr;
+  INT32 membersum, neighsum, memberscale, neighscale;
+  int colsum, lastcolsum, nextcolsum;
+
+  /* Expand input data enough to let all the output samples be generated
+   * by the standard loop.  Special-casing padded output would be more
+   * efficient.
+   */
+  expand_right_edge(input_data - 1, cinfo->max_v_samp_factor + 2,
+		    cinfo->image_width, output_cols);
+
+  /* Each of the eight neighbor pixels contributes a fraction SF to the
+   * smoothed pixel, while the main pixel contributes (1-8*SF).  In order
+   * to use integer arithmetic, these factors are multiplied by 2^16 = 65536.
+   * Also recall that SF = smoothing_factor / 1024.
+   */
+
+  memberscale = 65536L - cinfo->smoothing_factor * 512L; /* scaled 1-8*SF */
+  neighscale = cinfo->smoothing_factor * 64; /* scaled SF */
+
+  for (outrow = 0; outrow < compptr->v_samp_factor; outrow++) {
+    outptr = output_data[outrow];
+    inptr = input_data[outrow];
+    above_ptr = input_data[outrow-1];
+    below_ptr = input_data[outrow+1];
+
+    /* Special case for first column */
+    colsum = GETJSAMPLE(*above_ptr++) + GETJSAMPLE(*below_ptr++) +
+	     GETJSAMPLE(*inptr);
+    membersum = GETJSAMPLE(*inptr++);
+    nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +
+		 GETJSAMPLE(*inptr);
+    neighsum = colsum + (colsum - membersum) + nextcolsum;
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+    lastcolsum = colsum; colsum = nextcolsum;
+
+    for (colctr = output_cols - 2; colctr > 0; colctr--) {
+      membersum = GETJSAMPLE(*inptr++);
+      above_ptr++; below_ptr++;
+      nextcolsum = GETJSAMPLE(*above_ptr) + GETJSAMPLE(*below_ptr) +
+		   GETJSAMPLE(*inptr);
+      neighsum = lastcolsum + (colsum - membersum) + nextcolsum;
+      membersum = membersum * memberscale + neighsum * neighscale;
+      *outptr++ = (JSAMPLE) ((membersum + 32768) >> 16);
+      lastcolsum = colsum; colsum = nextcolsum;
+    }
+
+    /* Special case for last column */
+    membersum = GETJSAMPLE(*inptr);
+    neighsum = lastcolsum + (colsum - membersum) + colsum;
+    membersum = membersum * memberscale + neighsum * neighscale;
+    *outptr = (JSAMPLE) ((membersum + 32768) >> 16);
+
+  }
+}
+
+#endif /* INPUT_SMOOTHING_SUPPORTED */
+
+
+/*
+ * Module initialization routine for downsampling.
+ * Note that we must select a routine for each component.
+ */
+
+GLOBAL void
+jinit_downsampler (j_compress_ptr cinfo)
+{
+  my_downsample_ptr downsample;
+  int ci;
+  jpeg_component_info * compptr;
+  boolean smoothok = TRUE;
+
+  downsample = (my_downsample_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				SIZEOF(my_downsampler));
+  cinfo->downsample = (struct jpeg_downsampler *) downsample;
+  downsample->pub.start_pass = start_pass_downsample;
+  downsample->pub.downsample = sep_downsample;
+  downsample->pub.need_context_rows = FALSE;
+
+  if (cinfo->CCIR601_sampling)
+    ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
+
+  /* Verify we can handle the sampling factors, and set up method pointers */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    if (compptr->h_samp_factor == cinfo->max_h_samp_factor &&
+	compptr->v_samp_factor == cinfo->max_v_samp_factor) {
+#ifdef INPUT_SMOOTHING_SUPPORTED
+      if (cinfo->smoothing_factor) {
+	downsample->methods[ci] = fullsize_smooth_downsample;
+	downsample->pub.need_context_rows = TRUE;
+      } else
+#endif
+	downsample->methods[ci] = fullsize_downsample;
+    } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
+	       compptr->v_samp_factor == cinfo->max_v_samp_factor) {
+      smoothok = FALSE;
+      downsample->methods[ci] = h2v1_downsample;
+    } else if (compptr->h_samp_factor * 2 == cinfo->max_h_samp_factor &&
+	       compptr->v_samp_factor * 2 == cinfo->max_v_samp_factor) {
+#ifdef INPUT_SMOOTHING_SUPPORTED
+      if (cinfo->smoothing_factor) {
+	downsample->methods[ci] = h2v2_smooth_downsample;
+	downsample->pub.need_context_rows = TRUE;
+      } else
+#endif
+	downsample->methods[ci] = h2v2_downsample;
+    } else if ((cinfo->max_h_samp_factor % compptr->h_samp_factor) == 0 &&
+	       (cinfo->max_v_samp_factor % compptr->v_samp_factor) == 0) {
+      smoothok = FALSE;
+      downsample->methods[ci] = int_downsample;
+    } else
+      ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
+  }
+
+#ifdef INPUT_SMOOTHING_SUPPORTED
+  if (cinfo->smoothing_factor && !smoothok)
+    TRACEMS(cinfo, 0, JTRC_SMOOTH_NOTIMPL);
+#endif
+}