Update libjpeg_turbo to 1.4.90 from https://github.com/libjpeg-turbo/

jcprepct.c

 /*
  * jcprepct.c
  *
+ * This file is part of the Independent JPEG Group's software:
  * Copyright (C) 1994-1996, 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.
+ * It was modified by The libjpeg-turbo Project to include only code relevant
+ * to libjpeg-turbo.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
  *
  * This file contains the compression preprocessing controller.
  * This controller manages the color conversion, downsampling,
  * and edge expansion steps.
  *
  * Most of the complexity here is associated with buffering input rows
  * as required by the downsampler.  See the comments at the head of
  * jcsample.c for the downsampler's needs.
  */
 
@@ skipping 34 matching lines @@
 /* Private buffer controller object */
 
 typedef struct {
   struct jpeg_c_prep_controller pub; /* public fields */
 
   /* Downsampling input buffer.  This buffer holds color-converted data
    * until we have enough to do a downsample step.
    */
   JSAMPARRAY color_buf[MAX_COMPONENTS];
 
-  JDIMENSION rows_to_go;        /* counts rows remaining in source image */
-  int next_buf_row;             /* index of next row to store in color_buf */
+  JDIMENSION rows_to_go;        /* counts rows remaining in source image */
+  int next_buf_row;             /* index of next row to store in color_buf */
 
-#ifdef CONTEXT_ROWS_SUPPORTED   /* only needed for context case */
-  int this_row_group;           /* starting row index of group to process */
-  int next_buf_stop;            /* downsample when we reach this index */
+#ifdef CONTEXT_ROWS_SUPPORTED   /* only needed for context case */
+  int this_row_group;           /* starting row index of group to process */
+  int next_buf_stop;            /* downsample when we reach this index */
 #endif
 } my_prep_controller;
 
-typedef my_prep_controller * my_prep_ptr;
+typedef my_prep_controller *my_prep_ptr;
 
 
 /*
  * Initialize for a processing pass.
  */
 
 METHODDEF(void)
 start_pass_prep (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
 {
   my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
@@ skipping 16 matching lines @@
 }
 
 
 /*
  * Expand an image vertically from height input_rows to height output_rows,
  * by duplicating the bottom row.
  */
 
 LOCAL(void)
 expand_bottom_edge (JSAMPARRAY image_data, JDIMENSION num_cols,
-                    int input_rows, int output_rows)
+                    int input_rows, int output_rows)
 {
   register int row;
 
   for (row = input_rows; row < output_rows; row++) {
     jcopy_sample_rows(image_data, input_rows-1, image_data, row,
-                      1, num_cols);
+                      1, num_cols);
   }
 }
 
 
 /*
  * Process some data in the simple no-context case.
  *
  * Preprocessor output data is counted in "row groups".  A row group
  * is defined to be v_samp_factor sample rows of each component.
  * Downsampling will produce this much data from each max_v_samp_factor
  * input rows.
  */
 
 METHODDEF(void)
 pre_process_data (j_compress_ptr cinfo,
-                  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
-                  JDIMENSION in_rows_avail,
-                  JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
-                  JDIMENSION out_row_groups_avail)
+                  JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+                  JDIMENSION in_rows_avail,
+                  JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
+                  JDIMENSION out_row_groups_avail)
 {
   my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
   int numrows, ci;
   JDIMENSION inrows;
-  jpeg_component_info * compptr;
+  jpeg_component_info *compptr;
 
   while (*in_row_ctr < in_rows_avail &&
-         *out_row_group_ctr < out_row_groups_avail) {
+         *out_row_group_ctr < out_row_groups_avail) {
     /* Do color conversion to fill the conversion buffer. */
     inrows = in_rows_avail - *in_row_ctr;
     numrows = cinfo->max_v_samp_factor - prep->next_buf_row;
     numrows = (int) MIN((JDIMENSION) numrows, inrows);
     (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
-                                       prep->color_buf,
-                                       (JDIMENSION) prep->next_buf_row,
-                                       numrows);
+                                       prep->color_buf,
+                                       (JDIMENSION) prep->next_buf_row,
+                                       numrows);
     *in_row_ctr += numrows;
     prep->next_buf_row += numrows;
     prep->rows_to_go -= numrows;
     /* If at bottom of image, pad to fill the conversion buffer. */
     if (prep->rows_to_go == 0 &&
-        prep->next_buf_row < cinfo->max_v_samp_factor) {
+        prep->next_buf_row < cinfo->max_v_samp_factor) {
       for (ci = 0; ci < cinfo->num_components; ci++) {
-        expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
-                           prep->next_buf_row, cinfo->max_v_samp_factor);
+        expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
+                           prep->next_buf_row, cinfo->max_v_samp_factor);
       }
       prep->next_buf_row = cinfo->max_v_samp_factor;
     }
     /* If we've filled the conversion buffer, empty it. */
     if (prep->next_buf_row == cinfo->max_v_samp_factor) {
       (*cinfo->downsample->downsample) (cinfo,
-                                        prep->color_buf, (JDIMENSION) 0,
-                                        output_buf, *out_row_group_ctr);
+                                        prep->color_buf, (JDIMENSION) 0,
+                                        output_buf, *out_row_group_ctr);
       prep->next_buf_row = 0;
       (*out_row_group_ctr)++;
     }
     /* If at bottom of image, pad the output to a full iMCU height.
      * Note we assume the caller is providing a one-iMCU-height output buffer!
      */
     if (prep->rows_to_go == 0 &&
-        *out_row_group_ctr < out_row_groups_avail) {
+        *out_row_group_ctr < out_row_groups_avail) {
       for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-           ci++, compptr++) {
-        expand_bottom_edge(output_buf[ci],
-                           compptr->width_in_blocks * DCTSIZE,
-                           (int) (*out_row_group_ctr * compptr->v_samp_factor),
-                           (int) (out_row_groups_avail * compptr->v_samp_factor));
+           ci++, compptr++) {
+        expand_bottom_edge(output_buf[ci],
+                           compptr->width_in_blocks * DCTSIZE,
+                           (int) (*out_row_group_ctr * compptr->v_samp_factor),
+                           (int) (out_row_groups_avail * compptr->v_samp_factor));
       }
       *out_row_group_ctr = out_row_groups_avail;
-      break;                    /* can exit outer loop without test */
+      break;                    /* can exit outer loop without test */
     }
   }
 }
 
 
 #ifdef CONTEXT_ROWS_SUPPORTED
 
 /*
  * Process some data in the context case.
  */
 
 METHODDEF(void)
 pre_process_context (j_compress_ptr cinfo,
-                     JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
-                     JDIMENSION in_rows_avail,
-                     JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
-                     JDIMENSION out_row_groups_avail)
+                     JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+                     JDIMENSION in_rows_avail,
+                     JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
+                     JDIMENSION out_row_groups_avail)
 {
   my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
   int numrows, ci;
   int buf_height = cinfo->max_v_samp_factor * 3;
   JDIMENSION inrows;
 
   while (*out_row_group_ctr < out_row_groups_avail) {
     if (*in_row_ctr < in_rows_avail) {
       /* Do color conversion to fill the conversion buffer. */
       inrows = in_rows_avail - *in_row_ctr;
       numrows = prep->next_buf_stop - prep->next_buf_row;
       numrows = (int) MIN((JDIMENSION) numrows, inrows);
       (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
-                                         prep->color_buf,
-                                         (JDIMENSION) prep->next_buf_row,
-                                         numrows);
+                                         prep->color_buf,
+                                         (JDIMENSION) prep->next_buf_row,
+                                         numrows);
       /* Pad at top of image, if first time through */
       if (prep->rows_to_go == cinfo->image_height) {
-        for (ci = 0; ci < cinfo->num_components; ci++) {
-          int row;
-          for (row = 1; row <= cinfo->max_v_samp_factor; row++) {
-            jcopy_sample_rows(prep->color_buf[ci], 0,
-                              prep->color_buf[ci], -row,
-                              1, cinfo->image_width);
-          }
-        }
+        for (ci = 0; ci < cinfo->num_components; ci++) {
+          int row;
+          for (row = 1; row <= cinfo->max_v_samp_factor; row++) {
+            jcopy_sample_rows(prep->color_buf[ci], 0,
+                              prep->color_buf[ci], -row,
+                              1, cinfo->image_width);
+          }
+        }
       }
       *in_row_ctr += numrows;
       prep->next_buf_row += numrows;
       prep->rows_to_go -= numrows;
     } else {
       /* Return for more data, unless we are at the bottom of the image. */
       if (prep->rows_to_go != 0)
-        break;
+        break;
       /* When at bottom of image, pad to fill the conversion buffer. */
       if (prep->next_buf_row < prep->next_buf_stop) {
-        for (ci = 0; ci < cinfo->num_components; ci++) {
-          expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
-                             prep->next_buf_row, prep->next_buf_stop);
-        }
-        prep->next_buf_row = prep->next_buf_stop;
+        for (ci = 0; ci < cinfo->num_components; ci++) {
+          expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
+                             prep->next_buf_row, prep->next_buf_stop);
+        }
+        prep->next_buf_row = prep->next_buf_stop;
       }
     }
     /* If we've gotten enough data, downsample a row group. */
     if (prep->next_buf_row == prep->next_buf_stop) {
       (*cinfo->downsample->downsample) (cinfo,
-                                        prep->color_buf,
-                                        (JDIMENSION) prep->this_row_group,
-                                        output_buf, *out_row_group_ctr);
+                                        prep->color_buf,
+                                        (JDIMENSION) prep->this_row_group,
+                                        output_buf, *out_row_group_ctr);
       (*out_row_group_ctr)++;
       /* Advance pointers with wraparound as necessary. */
       prep->this_row_group += cinfo->max_v_samp_factor;
       if (prep->this_row_group >= buf_height)
-        prep->this_row_group = 0;
+        prep->this_row_group = 0;
       if (prep->next_buf_row >= buf_height)
-        prep->next_buf_row = 0;
+        prep->next_buf_row = 0;
       prep->next_buf_stop = prep->next_buf_row + cinfo->max_v_samp_factor;
     }
   }
 }
 
 
 /*
  * Create the wrapped-around downsampling input buffer needed for context mode.
  */
 
 LOCAL(void)
 create_context_buffer (j_compress_ptr cinfo)
 {
   my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
   int rgroup_height = cinfo->max_v_samp_factor;
   int ci, i;
-  jpeg_component_info * compptr;
+  jpeg_component_info *compptr;
   JSAMPARRAY true_buffer, fake_buffer;
 
   /* Grab enough space for fake row pointers for all the components;
    * we need five row groups' worth of pointers for each component.
    */
   fake_buffer = (JSAMPARRAY)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                (cinfo->num_components * 5 * rgroup_height) *
-                                SIZEOF(JSAMPROW));
+                                (cinfo->num_components * 5 * rgroup_height) *
+                                sizeof(JSAMPROW));
 
   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
        ci++, compptr++) {
     /* Allocate the actual buffer space (3 row groups) for this component.
      * We make the buffer wide enough to allow the downsampler to edge-expand
      * horizontally within the buffer, if it so chooses.
      */
     true_buffer = (*cinfo->mem->alloc_sarray)
       ((j_common_ptr) cinfo, JPOOL_IMAGE,
        (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
-                      cinfo->max_h_samp_factor) / compptr->h_samp_factor),
+                      cinfo->max_h_samp_factor) / compptr->h_samp_factor),
        (JDIMENSION) (3 * rgroup_height));
     /* Copy true buffer row pointers into the middle of the fake row array */
     MEMCOPY(fake_buffer + rgroup_height, true_buffer,
-            3 * rgroup_height * SIZEOF(JSAMPROW));
+            3 * rgroup_height * sizeof(JSAMPROW));
     /* Fill in the above and below wraparound pointers */
     for (i = 0; i < rgroup_height; i++) {
       fake_buffer[i] = true_buffer[2 * rgroup_height + i];
       fake_buffer[4 * rgroup_height + i] = true_buffer[i];
     }
     prep->color_buf[ci] = fake_buffer + rgroup_height;
     fake_buffer += 5 * rgroup_height; /* point to space for next component */
   }
 }
 
 #endif /* CONTEXT_ROWS_SUPPORTED */
 
 
 /*
  * Initialize preprocessing controller.
  */
 
 GLOBAL(void)
 jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer)
 {
   my_prep_ptr prep;
   int ci;
-  jpeg_component_info * compptr;
+  jpeg_component_info *compptr;
 
-  if (need_full_buffer)         /* safety check */
+  if (need_full_buffer)         /* safety check */
     ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
 
   prep = (my_prep_ptr)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                SIZEOF(my_prep_controller));
+                                sizeof(my_prep_controller));
   cinfo->prep = (struct jpeg_c_prep_controller *) prep;
   prep->pub.start_pass = start_pass_prep;
 
   /* Allocate the color conversion buffer.
    * We make the buffer wide enough to allow the downsampler to edge-expand
    * horizontally within the buffer, if it so chooses.
    */
   if (cinfo->downsample->need_context_rows) {
     /* Set up to provide context rows */
 #ifdef CONTEXT_ROWS_SUPPORTED
     prep->pub.pre_process_data = pre_process_context;
     create_context_buffer(cinfo);
 #else
     ERREXIT(cinfo, JERR_NOT_COMPILED);
 #endif
   } else {
     /* No context, just make it tall enough for one row group */
     prep->pub.pre_process_data = pre_process_data;
     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-         ci++, compptr++) {
+         ci++, compptr++) {
       prep->color_buf[ci] = (*cinfo->mem->alloc_sarray)
-        ((j_common_ptr) cinfo, JPOOL_IMAGE,
-         (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
-                        cinfo->max_h_samp_factor) / compptr->h_samp_factor),
-         (JDIMENSION) cinfo->max_v_samp_factor);
+        ((j_common_ptr) cinfo, JPOOL_IMAGE,
+         (JDIMENSION) (((long) compptr->width_in_blocks * DCTSIZE *
+                        cinfo->max_h_samp_factor) / compptr->h_samp_factor),
+         (JDIMENSION) cinfo->max_v_samp_factor);
     }
   }
 }