LCOV - code coverage report
Current view: directory - media/libjpeg - jdsample.c (source / functions) Found Hit Coverage
Test: app.info Lines: 177 71 40.1 %
Date: 2012-06-02 Functions: 10 4 40.0 %

       1                 : /*
       2                 :  * jdsample.c
       3                 :  *
       4                 :  * Copyright (C) 1991-1996, Thomas G. Lane.
       5                 :  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
       6                 :  * Copyright (C) 2010, D. R. Commander.
       7                 :  * This file is part of the Independent JPEG Group's software.
       8                 :  * For conditions of distribution and use, see the accompanying README file.
       9                 :  *
      10                 :  * This file contains upsampling routines.
      11                 :  *
      12                 :  * Upsampling input data is counted in "row groups".  A row group
      13                 :  * is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size)
      14                 :  * sample rows of each component.  Upsampling will normally produce
      15                 :  * max_v_samp_factor pixel rows from each row group (but this could vary
      16                 :  * if the upsampler is applying a scale factor of its own).
      17                 :  *
      18                 :  * An excellent reference for image resampling is
      19                 :  *   Digital Image Warping, George Wolberg, 1990.
      20                 :  *   Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
      21                 :  */
      22                 : 
      23                 : #define JPEG_INTERNALS
      24                 : #include "jinclude.h"
      25                 : #include "jpeglib.h"
      26                 : #include "jsimd.h"
      27                 : #include "jpegcomp.h"
      28                 : 
      29                 : 
      30                 : /* Pointer to routine to upsample a single component */
      31                 : typedef JMETHOD(void, upsample1_ptr,
      32                 :                 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
      33                 :                  JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr));
      34                 : 
      35                 : /* Private subobject */
      36                 : 
      37                 : typedef struct {
      38                 :   struct jpeg_upsampler pub;    /* public fields */
      39                 : 
      40                 :   /* Color conversion buffer.  When using separate upsampling and color
      41                 :    * conversion steps, this buffer holds one upsampled row group until it
      42                 :    * has been color converted and output.
      43                 :    * Note: we do not allocate any storage for component(s) which are full-size,
      44                 :    * ie do not need rescaling.  The corresponding entry of color_buf[] is
      45                 :    * simply set to point to the input data array, thereby avoiding copying.
      46                 :    */
      47                 :   JSAMPARRAY color_buf[MAX_COMPONENTS];
      48                 : 
      49                 :   /* Per-component upsampling method pointers */
      50                 :   upsample1_ptr methods[MAX_COMPONENTS];
      51                 : 
      52                 :   int next_row_out;             /* counts rows emitted from color_buf */
      53                 :   JDIMENSION rows_to_go;        /* counts rows remaining in image */
      54                 : 
      55                 :   /* Height of an input row group for each component. */
      56                 :   int rowgroup_height[MAX_COMPONENTS];
      57                 : 
      58                 :   /* These arrays save pixel expansion factors so that int_expand need not
      59                 :    * recompute them each time.  They are unused for other upsampling methods.
      60                 :    */
      61                 :   UINT8 h_expand[MAX_COMPONENTS];
      62                 :   UINT8 v_expand[MAX_COMPONENTS];
      63                 : } my_upsampler;
      64                 : 
      65                 : typedef my_upsampler * my_upsample_ptr;
      66                 : 
      67                 : 
      68                 : /*
      69                 :  * Initialize for an upsampling pass.
      70                 :  */
      71                 : 
      72                 : METHODDEF(void)
      73               5 : start_pass_upsample (j_decompress_ptr cinfo)
      74                 : {
      75               5 :   my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
      76                 : 
      77                 :   /* Mark the conversion buffer empty */
      78               5 :   upsample->next_row_out = cinfo->max_v_samp_factor;
      79                 :   /* Initialize total-height counter for detecting bottom of image */
      80               5 :   upsample->rows_to_go = cinfo->output_height;
      81               5 : }
      82                 : 
      83                 : 
      84                 : /*
      85                 :  * Control routine to do upsampling (and color conversion).
      86                 :  *
      87                 :  * In this version we upsample each component independently.
      88                 :  * We upsample one row group into the conversion buffer, then apply
      89                 :  * color conversion a row at a time.
      90                 :  */
      91                 : 
      92                 : METHODDEF(void)
      93             231 : sep_upsample (j_decompress_ptr cinfo,
      94                 :               JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
      95                 :               JDIMENSION in_row_groups_avail,
      96                 :               JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
      97                 :               JDIMENSION out_rows_avail)
      98                 : {
      99             231 :   my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
     100                 :   int ci;
     101                 :   jpeg_component_info * compptr;
     102                 :   JDIMENSION num_rows;
     103                 : 
     104                 :   /* Fill the conversion buffer, if it's empty */
     105             231 :   if (upsample->next_row_out >= cinfo->max_v_samp_factor) {
     106             580 :     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     107             348 :          ci++, compptr++) {
     108                 :       /* Invoke per-component upsample method.  Notice we pass a POINTER
     109                 :        * to color_buf[ci], so that fullsize_upsample can change it.
     110                 :        */
     111            1392 :       (*upsample->methods[ci]) (cinfo, compptr,
     112             348 :         input_buf[ci] + (*in_row_group_ctr * upsample->rowgroup_height[ci]),
     113             696 :         upsample->color_buf + ci);
     114                 :     }
     115             116 :     upsample->next_row_out = 0;
     116                 :   }
     117                 : 
     118                 :   /* Color-convert and emit rows */
     119                 : 
     120                 :   /* How many we have in the buffer: */
     121             231 :   num_rows = (JDIMENSION) (cinfo->max_v_samp_factor - upsample->next_row_out);
     122                 :   /* Not more than the distance to the end of the image.  Need this test
     123                 :    * in case the image height is not a multiple of max_v_samp_factor:
     124                 :    */
     125             231 :   if (num_rows > upsample->rows_to_go) 
     126               1 :     num_rows = upsample->rows_to_go;
     127                 :   /* And not more than what the client can accept: */
     128             231 :   out_rows_avail -= *out_row_ctr;
     129             231 :   if (num_rows > out_rows_avail)
     130             115 :     num_rows = out_rows_avail;
     131                 : 
     132             693 :   (*cinfo->cconvert->color_convert) (cinfo, upsample->color_buf,
     133             231 :                                      (JDIMENSION) upsample->next_row_out,
     134             231 :                                      output_buf + *out_row_ctr,
     135                 :                                      (int) num_rows);
     136                 : 
     137                 :   /* Adjust counts */
     138             231 :   *out_row_ctr += num_rows;
     139             231 :   upsample->rows_to_go -= num_rows;
     140             231 :   upsample->next_row_out += num_rows;
     141                 :   /* When the buffer is emptied, declare this input row group consumed */
     142             231 :   if (upsample->next_row_out >= cinfo->max_v_samp_factor)
     143             115 :     (*in_row_group_ctr)++;
     144             231 : }
     145                 : 
     146                 : 
     147                 : /*
     148                 :  * These are the routines invoked by sep_upsample to upsample pixel values
     149                 :  * of a single component.  One row group is processed per call.
     150                 :  */
     151                 : 
     152                 : 
     153                 : /*
     154                 :  * For full-size components, we just make color_buf[ci] point at the
     155                 :  * input buffer, and thus avoid copying any data.  Note that this is
     156                 :  * safe only because sep_upsample doesn't declare the input row group
     157                 :  * "consumed" until we are done color converting and emitting it.
     158                 :  */
     159                 : 
     160                 : METHODDEF(void)
     161             116 : fullsize_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     162                 :                    JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     163                 : {
     164             116 :   *output_data_ptr = input_data;
     165             116 : }
     166                 : 
     167                 : 
     168                 : /*
     169                 :  * This is a no-op version used for "uninteresting" components.
     170                 :  * These components will not be referenced by color conversion.
     171                 :  */
     172                 : 
     173                 : METHODDEF(void)
     174               0 : noop_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     175                 :                JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     176                 : {
     177               0 :   *output_data_ptr = NULL;      /* safety check */
     178               0 : }
     179                 : 
     180                 : 
     181                 : /*
     182                 :  * This version handles any integral sampling ratios.
     183                 :  * This is not used for typical JPEG files, so it need not be fast.
     184                 :  * Nor, for that matter, is it particularly accurate: the algorithm is
     185                 :  * simple replication of the input pixel onto the corresponding output
     186                 :  * pixels.  The hi-falutin sampling literature refers to this as a
     187                 :  * "box filter".  A box filter tends to introduce visible artifacts,
     188                 :  * so if you are actually going to use 3:1 or 4:1 sampling ratios
     189                 :  * you would be well advised to improve this code.
     190                 :  */
     191                 : 
     192                 : METHODDEF(void)
     193               0 : int_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     194                 :               JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     195                 : {
     196               0 :   my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
     197               0 :   JSAMPARRAY output_data = *output_data_ptr;
     198                 :   register JSAMPROW inptr, outptr;
     199                 :   register JSAMPLE invalue;
     200                 :   register int h;
     201                 :   JSAMPROW outend;
     202                 :   int h_expand, v_expand;
     203                 :   int inrow, outrow;
     204                 : 
     205               0 :   h_expand = upsample->h_expand[compptr->component_index];
     206               0 :   v_expand = upsample->v_expand[compptr->component_index];
     207                 : 
     208               0 :   inrow = outrow = 0;
     209               0 :   while (outrow < cinfo->max_v_samp_factor) {
     210                 :     /* Generate one output row with proper horizontal expansion */
     211               0 :     inptr = input_data[inrow];
     212               0 :     outptr = output_data[outrow];
     213               0 :     outend = outptr + cinfo->output_width;
     214               0 :     while (outptr < outend) {
     215               0 :       invalue = *inptr++;       /* don't need GETJSAMPLE() here */
     216               0 :       for (h = h_expand; h > 0; h--) {
     217               0 :         *outptr++ = invalue;
     218                 :       }
     219                 :     }
     220                 :     /* Generate any additional output rows by duplicating the first one */
     221               0 :     if (v_expand > 1) {
     222               0 :       jcopy_sample_rows(output_data, outrow, output_data, outrow+1,
     223                 :                         v_expand-1, cinfo->output_width);
     224                 :     }
     225               0 :     inrow++;
     226               0 :     outrow += v_expand;
     227                 :   }
     228               0 : }
     229                 : 
     230                 : 
     231                 : /*
     232                 :  * Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
     233                 :  * It's still a box filter.
     234                 :  */
     235                 : 
     236                 : METHODDEF(void)
     237               0 : h2v1_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     238                 :                JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     239                 : {
     240               0 :   JSAMPARRAY output_data = *output_data_ptr;
     241                 :   register JSAMPROW inptr, outptr;
     242                 :   register JSAMPLE invalue;
     243                 :   JSAMPROW outend;
     244                 :   int inrow;
     245                 : 
     246               0 :   for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
     247               0 :     inptr = input_data[inrow];
     248               0 :     outptr = output_data[inrow];
     249               0 :     outend = outptr + cinfo->output_width;
     250               0 :     while (outptr < outend) {
     251               0 :       invalue = *inptr++;       /* don't need GETJSAMPLE() here */
     252               0 :       *outptr++ = invalue;
     253               0 :       *outptr++ = invalue;
     254                 :     }
     255                 :   }
     256               0 : }
     257                 : 
     258                 : 
     259                 : /*
     260                 :  * Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
     261                 :  * It's still a box filter.
     262                 :  */
     263                 : 
     264                 : METHODDEF(void)
     265               0 : h2v2_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     266                 :                JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     267                 : {
     268               0 :   JSAMPARRAY output_data = *output_data_ptr;
     269                 :   register JSAMPROW inptr, outptr;
     270                 :   register JSAMPLE invalue;
     271                 :   JSAMPROW outend;
     272                 :   int inrow, outrow;
     273                 : 
     274               0 :   inrow = outrow = 0;
     275               0 :   while (outrow < cinfo->max_v_samp_factor) {
     276               0 :     inptr = input_data[inrow];
     277               0 :     outptr = output_data[outrow];
     278               0 :     outend = outptr + cinfo->output_width;
     279               0 :     while (outptr < outend) {
     280               0 :       invalue = *inptr++;       /* don't need GETJSAMPLE() here */
     281               0 :       *outptr++ = invalue;
     282               0 :       *outptr++ = invalue;
     283                 :     }
     284               0 :     jcopy_sample_rows(output_data, outrow, output_data, outrow+1,
     285                 :                       1, cinfo->output_width);
     286               0 :     inrow++;
     287               0 :     outrow += 2;
     288                 :   }
     289               0 : }
     290                 : 
     291                 : 
     292                 : /*
     293                 :  * Fancy processing for the common case of 2:1 horizontal and 1:1 vertical.
     294                 :  *
     295                 :  * The upsampling algorithm is linear interpolation between pixel centers,
     296                 :  * also known as a "triangle filter".  This is a good compromise between
     297                 :  * speed and visual quality.  The centers of the output pixels are 1/4 and 3/4
     298                 :  * of the way between input pixel centers.
     299                 :  *
     300                 :  * A note about the "bias" calculations: when rounding fractional values to
     301                 :  * integer, we do not want to always round 0.5 up to the next integer.
     302                 :  * If we did that, we'd introduce a noticeable bias towards larger values.
     303                 :  * Instead, this code is arranged so that 0.5 will be rounded up or down at
     304                 :  * alternate pixel locations (a simple ordered dither pattern).
     305                 :  */
     306                 : 
     307                 : METHODDEF(void)
     308               0 : h2v1_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     309                 :                      JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     310                 : {
     311               0 :   JSAMPARRAY output_data = *output_data_ptr;
     312                 :   register JSAMPROW inptr, outptr;
     313                 :   register int invalue;
     314                 :   register JDIMENSION colctr;
     315                 :   int inrow;
     316                 : 
     317               0 :   for (inrow = 0; inrow < cinfo->max_v_samp_factor; inrow++) {
     318               0 :     inptr = input_data[inrow];
     319               0 :     outptr = output_data[inrow];
     320                 :     /* Special case for first column */
     321               0 :     invalue = GETJSAMPLE(*inptr++);
     322               0 :     *outptr++ = (JSAMPLE) invalue;
     323               0 :     *outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(*inptr) + 2) >> 2);
     324                 : 
     325               0 :     for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
     326                 :       /* General case: 3/4 * nearer pixel + 1/4 * further pixel */
     327               0 :       invalue = GETJSAMPLE(*inptr++) * 3;
     328               0 :       *outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(inptr[-2]) + 1) >> 2);
     329               0 :       *outptr++ = (JSAMPLE) ((invalue + GETJSAMPLE(*inptr) + 2) >> 2);
     330                 :     }
     331                 : 
     332                 :     /* Special case for last column */
     333               0 :     invalue = GETJSAMPLE(*inptr);
     334               0 :     *outptr++ = (JSAMPLE) ((invalue * 3 + GETJSAMPLE(inptr[-1]) + 1) >> 2);
     335               0 :     *outptr++ = (JSAMPLE) invalue;
     336                 :   }
     337               0 : }
     338                 : 
     339                 : 
     340                 : /*
     341                 :  * Fancy processing for the common case of 2:1 horizontal and 2:1 vertical.
     342                 :  * Again a triangle filter; see comments for h2v1 case, above.
     343                 :  *
     344                 :  * It is OK for us to reference the adjacent input rows because we demanded
     345                 :  * context from the main buffer controller (see initialization code).
     346                 :  */
     347                 : 
     348                 : METHODDEF(void)
     349               0 : h2v2_fancy_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
     350                 :                      JSAMPARRAY input_data, JSAMPARRAY * output_data_ptr)
     351                 : {
     352               0 :   JSAMPARRAY output_data = *output_data_ptr;
     353                 :   register JSAMPROW inptr0, inptr1, outptr;
     354                 : #if BITS_IN_JSAMPLE == 8
     355                 :   register int thiscolsum, lastcolsum, nextcolsum;
     356                 : #else
     357                 :   register INT32 thiscolsum, lastcolsum, nextcolsum;
     358                 : #endif
     359                 :   register JDIMENSION colctr;
     360                 :   int inrow, outrow, v;
     361                 : 
     362               0 :   inrow = outrow = 0;
     363               0 :   while (outrow < cinfo->max_v_samp_factor) {
     364               0 :     for (v = 0; v < 2; v++) {
     365                 :       /* inptr0 points to nearest input row, inptr1 points to next nearest */
     366               0 :       inptr0 = input_data[inrow];
     367               0 :       if (v == 0)               /* next nearest is row above */
     368               0 :         inptr1 = input_data[inrow-1];
     369                 :       else                      /* next nearest is row below */
     370               0 :         inptr1 = input_data[inrow+1];
     371               0 :       outptr = output_data[outrow++];
     372                 : 
     373                 :       /* Special case for first column */
     374               0 :       thiscolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
     375               0 :       nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
     376               0 :       *outptr++ = (JSAMPLE) ((thiscolsum * 4 + 8) >> 4);
     377               0 :       *outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4);
     378               0 :       lastcolsum = thiscolsum; thiscolsum = nextcolsum;
     379                 : 
     380               0 :       for (colctr = compptr->downsampled_width - 2; colctr > 0; colctr--) {
     381                 :         /* General case: 3/4 * nearer pixel + 1/4 * further pixel in each */
     382                 :         /* dimension, thus 9/16, 3/16, 3/16, 1/16 overall */
     383               0 :         nextcolsum = GETJSAMPLE(*inptr0++) * 3 + GETJSAMPLE(*inptr1++);
     384               0 :         *outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4);
     385               0 :         *outptr++ = (JSAMPLE) ((thiscolsum * 3 + nextcolsum + 7) >> 4);
     386               0 :         lastcolsum = thiscolsum; thiscolsum = nextcolsum;
     387                 :       }
     388                 : 
     389                 :       /* Special case for last column */
     390               0 :       *outptr++ = (JSAMPLE) ((thiscolsum * 3 + lastcolsum + 8) >> 4);
     391               0 :       *outptr++ = (JSAMPLE) ((thiscolsum * 4 + 7) >> 4);
     392                 :     }
     393               0 :     inrow++;
     394                 :   }
     395               0 : }
     396                 : 
     397                 : 
     398                 : /*
     399                 :  * Module initialization routine for upsampling.
     400                 :  */
     401                 : 
     402                 : GLOBAL(void)
     403               5 : jinit_upsampler (j_decompress_ptr cinfo)
     404                 : {
     405                 :   my_upsample_ptr upsample;
     406                 :   int ci;
     407                 :   jpeg_component_info * compptr;
     408                 :   boolean need_buffer, do_fancy;
     409                 :   int h_in_group, v_in_group, h_out_group, v_out_group;
     410                 : 
     411               5 :   upsample = (my_upsample_ptr)
     412               5 :     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
     413                 :                                 SIZEOF(my_upsampler));
     414               5 :   cinfo->upsample = (struct jpeg_upsampler *) upsample;
     415               5 :   upsample->pub.start_pass = start_pass_upsample;
     416               5 :   upsample->pub.upsample = sep_upsample;
     417               5 :   upsample->pub.need_context_rows = FALSE; /* until we find out differently */
     418                 : 
     419               5 :   if (cinfo->CCIR601_sampling)       /* this isn't supported */
     420               0 :     ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
     421                 : 
     422                 :   /* jdmainct.c doesn't support context rows when min_DCT_scaled_size = 1,
     423                 :    * so don't ask for it.
     424                 :    */
     425               5 :   do_fancy = cinfo->do_fancy_upsampling && cinfo->_min_DCT_scaled_size > 1;
     426                 : 
     427                 :   /* Verify we can handle the sampling factors, select per-component methods,
     428                 :    * and create storage as needed.
     429                 :    */
     430              25 :   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     431              15 :        ci++, compptr++) {
     432                 :     /* Compute size of an "input group" after IDCT scaling.  This many samples
     433                 :      * are to be converted to max_h_samp_factor * max_v_samp_factor pixels.
     434                 :      */
     435              30 :     h_in_group = (compptr->h_samp_factor * compptr->_DCT_scaled_size) /
     436              15 :                  cinfo->_min_DCT_scaled_size;
     437              30 :     v_in_group = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
     438              15 :                  cinfo->_min_DCT_scaled_size;
     439              15 :     h_out_group = cinfo->max_h_samp_factor;
     440              15 :     v_out_group = cinfo->max_v_samp_factor;
     441              15 :     upsample->rowgroup_height[ci] = v_in_group; /* save for use later */
     442              15 :     need_buffer = TRUE;
     443              15 :     if (! compptr->component_needed) {
     444                 :       /* Don't bother to upsample an uninteresting component. */
     445               0 :       upsample->methods[ci] = noop_upsample;
     446               0 :       need_buffer = FALSE;
     447              15 :     } else if (h_in_group == h_out_group && v_in_group == v_out_group) {
     448                 :       /* Fullsize components can be processed without any work. */
     449               5 :       upsample->methods[ci] = fullsize_upsample;
     450               5 :       need_buffer = FALSE;
     451              10 :     } else if (h_in_group * 2 == h_out_group &&
     452                 :                v_in_group == v_out_group) {
     453                 :       /* Special cases for 2h1v upsampling */
     454               0 :       if (do_fancy && compptr->downsampled_width > 2) {
     455               0 :         if (jsimd_can_h2v1_fancy_upsample())
     456               0 :           upsample->methods[ci] = jsimd_h2v1_fancy_upsample;
     457                 :         else
     458               0 :           upsample->methods[ci] = h2v1_fancy_upsample;
     459                 :       } else {
     460               0 :         if (jsimd_can_h2v1_upsample())
     461               0 :           upsample->methods[ci] = jsimd_h2v1_upsample;
     462                 :         else
     463               0 :           upsample->methods[ci] = h2v1_upsample;
     464                 :       }
     465              20 :     } else if (h_in_group * 2 == h_out_group &&
     466              10 :                v_in_group * 2 == v_out_group) {
     467                 :       /* Special cases for 2h2v upsampling */
     468              20 :       if (do_fancy && compptr->downsampled_width > 2) {
     469               6 :         if (jsimd_can_h2v2_fancy_upsample())
     470               6 :           upsample->methods[ci] = jsimd_h2v2_fancy_upsample;
     471                 :         else
     472               0 :           upsample->methods[ci] = h2v2_fancy_upsample;
     473               6 :         upsample->pub.need_context_rows = TRUE;
     474                 :       } else {
     475               4 :         if (jsimd_can_h2v2_upsample())
     476               4 :           upsample->methods[ci] = jsimd_h2v2_upsample;
     477                 :         else
     478               0 :           upsample->methods[ci] = h2v2_upsample;
     479                 :       }
     480               0 :     } else if ((h_out_group % h_in_group) == 0 &&
     481               0 :                (v_out_group % v_in_group) == 0) {
     482                 :       /* Generic integral-factors upsampling method */
     483               0 :       upsample->methods[ci] = int_upsample;
     484               0 :       upsample->h_expand[ci] = (UINT8) (h_out_group / h_in_group);
     485               0 :       upsample->v_expand[ci] = (UINT8) (v_out_group / v_in_group);
     486                 :     } else
     487               0 :       ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
     488              15 :     if (need_buffer) {
     489              20 :       upsample->color_buf[ci] = (*cinfo->mem->alloc_sarray)
     490              30 :         ((j_common_ptr) cinfo, JPOOL_IMAGE,
     491              10 :          (JDIMENSION) jround_up((long) cinfo->output_width,
     492              10 :                                 (long) cinfo->max_h_samp_factor),
     493              10 :          (JDIMENSION) cinfo->max_v_samp_factor);
     494                 :     }
     495                 :   }
     496               5 : }

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