Update libjpeg-turbo to r722.

jcmainct.c

 /*
  * jcmainct.c
  *
  * 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.
  *
  * This file contains the main buffer controller for compression.
  * The main buffer lies between the pre-processor and the JPEG
  * compressor proper; it holds downsampled data in the JPEG colorspace.
@@ skipping 50 matching lines @@
 #endif
 
 
 /*
  * Initialize for a processing pass.
  */
 
 METHODDEF(void)
 start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
 {
-  my_main_ptr main = (my_main_ptr) cinfo->main;
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
 
   /* Do nothing in raw-data mode. */
   if (cinfo->raw_data_in)
     return;
 
-  main->cur_iMCU_row = 0;       /* initialize counters */
-  main->rowgroup_ctr = 0;
-  main->suspended = FALSE;
-  main->pass_mode = pass_mode;  /* save mode for use by process_data */
+  main_ptr->cur_iMCU_row = 0;   /* initialize counters */
+  main_ptr->rowgroup_ctr = 0;
+  main_ptr->suspended = FALSE;
+  main_ptr->pass_mode = pass_mode;      /* save mode for use by process_data */
 
   switch (pass_mode) {
   case JBUF_PASS_THRU:
 #ifdef FULL_MAIN_BUFFER_SUPPORTED
-    if (main->whole_image[0] != NULL)
+    if (main_ptr->whole_image[0] != NULL)
       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
 #endif
-    main->pub.process_data = process_data_simple_main;
+    main_ptr->pub.process_data = process_data_simple_main;
     break;
 #ifdef FULL_MAIN_BUFFER_SUPPORTED
   case JBUF_SAVE_SOURCE:
   case JBUF_CRANK_DEST:
   case JBUF_SAVE_AND_PASS:
-    if (main->whole_image[0] == NULL)
+    if (main_ptr->whole_image[0] == NULL)
       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-    main->pub.process_data = process_data_buffer_main;
+    main_ptr->pub.process_data = process_data_buffer_main;
     break;
 #endif
   default:
     ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
     break;
   }
 }
 
 
 /*
  * Process some data.
  * This routine handles the simple pass-through mode,
  * where we have only a strip buffer.
  */
 
 METHODDEF(void)
 process_data_simple_main (j_compress_ptr cinfo,
                           JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
                           JDIMENSION in_rows_avail)
 {
-  my_main_ptr main = (my_main_ptr) cinfo->main;
+  my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
 
-  while (main->cur_iMCU_row < cinfo->total_iMCU_rows) {
+  while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
     /* Read input data if we haven't filled the main buffer yet */
-    if (main->rowgroup_ctr < DCTSIZE)
+    if (main_ptr->rowgroup_ctr < DCTSIZE)
       (*cinfo->prep->pre_process_data) (cinfo,
                                         input_buf, in_row_ctr, in_rows_avail,
-                                        main->buffer, &main->rowgroup_ctr,
+                                        main_ptr->buffer, &main_ptr->rowgroup_ctr,
                                         (JDIMENSION) DCTSIZE);
 
     /* If we don't have a full iMCU row buffered, return to application for
      * more data.  Note that preprocessor will always pad to fill the iMCU row
      * at the bottom of the image.
      */
-    if (main->rowgroup_ctr != DCTSIZE)
+    if (main_ptr->rowgroup_ctr != DCTSIZE)
       return;
 
     /* Send the completed row to the compressor */
-    if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) {
+    if (! (*cinfo->coef->compress_data) (cinfo, main_ptr->buffer)) {
       /* If compressor did not consume the whole row, then we must need to
        * suspend processing and return to the application.  In this situation
        * we pretend we didn't yet consume the last input row; otherwise, if
        * it happened to be the last row of the image, the application would
        * think we were done.
        */
-      if (! main->suspended) {
+      if (! main_ptr->suspended) {
         (*in_row_ctr)--;
-        main->suspended = TRUE;
+        main_ptr->suspended = TRUE;
       }
       return;
     }
     /* We did finish the row.  Undo our little suspension hack if a previous
      * call suspended; then mark the main buffer empty.
      */
-    if (main->suspended) {
+    if (main_ptr->suspended) {
       (*in_row_ctr)++;
-      main->suspended = FALSE;
+      main_ptr->suspended = FALSE;
     }
-    main->rowgroup_ctr = 0;
-    main->cur_iMCU_row++;
+    main_ptr->rowgroup_ctr = 0;
+    main_ptr->cur_iMCU_row++;
   }
 }
 
 
 #ifdef FULL_MAIN_BUFFER_SUPPORTED
 
 /*
  * Process some data.
  * This routine handles all of the modes that use a full-size buffer.
  */
 
 METHODDEF(void)
 process_data_buffer_main (j_compress_ptr cinfo,
                           JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
                           JDIMENSION in_rows_avail)
 {
   my_main_ptr main = (my_main_ptr) cinfo->main;
   int ci;
   jpeg_component_info *compptr;
-  boolean writing = (main->pass_mode != JBUF_CRANK_DEST);
+  boolean writing = (main_ptr->pass_mode != JBUF_CRANK_DEST);
 
-  while (main->cur_iMCU_row < cinfo->total_iMCU_rows) {
+  while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
     /* Realign the virtual buffers if at the start of an iMCU row. */
-    if (main->rowgroup_ctr == 0) {
+    if (main_ptr->rowgroup_ctr == 0) {
       for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
            ci++, compptr++) {
-        main->buffer[ci] = (*cinfo->mem->access_virt_sarray)
-          ((j_common_ptr) cinfo, main->whole_image[ci],
-           main->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE),
+        main_ptr->buffer[ci] = (*cinfo->mem->access_virt_sarray)
+          ((j_common_ptr) cinfo, main_ptr->whole_image[ci],
+           main_ptr->cur_iMCU_row * (compptr->v_samp_factor * DCTSIZE),
            (JDIMENSION) (compptr->v_samp_factor * DCTSIZE), writing);
       }
       /* In a read pass, pretend we just read some source data. */
       if (! writing) {
         *in_row_ctr += cinfo->max_v_samp_factor * DCTSIZE;
-        main->rowgroup_ctr = DCTSIZE;
+        main_ptr->rowgroup_ctr = DCTSIZE;
       }
     }
 
     /* If a write pass, read input data until the current iMCU row is full. */
     /* Note: preprocessor will pad if necessary to fill the last iMCU row. */
     if (writing) {
       (*cinfo->prep->pre_process_data) (cinfo,
                                         input_buf, in_row_ctr, in_rows_avail,
-                                        main->buffer, &main->rowgroup_ctr,
+                                        main_ptr->buffer, &main_ptr->rowgroup_ctr,
                                         (JDIMENSION) DCTSIZE);
       /* Return to application if we need more data to fill the iMCU row. */
-      if (main->rowgroup_ctr < DCTSIZE)
+      if (main_ptr->rowgroup_ctr < DCTSIZE)
         return;
     }
 
     /* Emit data, unless this is a sink-only pass. */
-    if (main->pass_mode != JBUF_SAVE_SOURCE) {
-      if (! (*cinfo->coef->compress_data) (cinfo, main->buffer)) {
+    if (main_ptr->pass_mode != JBUF_SAVE_SOURCE) {
+      if (! (*cinfo->coef->compress_data) (cinfo, main_ptr->buffer)) {
         /* If compressor did not consume the whole row, then we must need to
          * suspend processing and return to the application.  In this situation
          * we pretend we didn't yet consume the last input row; otherwise, if
          * it happened to be the last row of the image, the application would
          * think we were done.
          */
-        if (! main->suspended) {
+        if (! main_ptr->suspended) {
           (*in_row_ctr)--;
-          main->suspended = TRUE;
+          main_ptr->suspended = TRUE;
         }
         return;
       }
       /* We did finish the row.  Undo our little suspension hack if a previous
        * call suspended; then mark the main buffer empty.
        */
-      if (main->suspended) {
+      if (main_ptr->suspended) {
         (*in_row_ctr)++;
-        main->suspended = FALSE;
+        main_ptr->suspended = FALSE;
       }
     }
 
     /* If get here, we are done with this iMCU row.  Mark buffer empty. */
-    main->rowgroup_ctr = 0;
-    main->cur_iMCU_row++;
+    main_ptr->rowgroup_ctr = 0;
+    main_ptr->cur_iMCU_row++;
   }
 }
 
 #endif /* FULL_MAIN_BUFFER_SUPPORTED */
 
 
 /*
  * Initialize main buffer controller.
  */
 
 GLOBAL(void)
 jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer)
 {
-  my_main_ptr main;
+  my_main_ptr main_ptr;
   int ci;
   jpeg_component_info *compptr;
 
-  main = (my_main_ptr)
+  main_ptr = (my_main_ptr)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
                                 SIZEOF(my_main_controller));
-  cinfo->main = (struct jpeg_c_main_controller *) main;
-  main->pub.start_pass = start_pass_main;
+  cinfo->main = (struct jpeg_c_main_controller *) main_ptr;
+  main_ptr->pub.start_pass = start_pass_main;
 
   /* We don't need to create a buffer in raw-data mode. */
   if (cinfo->raw_data_in)
     return;
 
   /* Create the buffer.  It holds downsampled data, so each component
    * may be of a different size.
    */
   if (need_full_buffer) {
 #ifdef FULL_MAIN_BUFFER_SUPPORTED
     /* Allocate a full-image virtual array for each component */
     /* Note we pad the bottom to a multiple of the iMCU height */
     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
          ci++, compptr++) {
-      main->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
+      main_ptr->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
         ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
          compptr->width_in_blocks * DCTSIZE,
          (JDIMENSION) jround_up((long) compptr->height_in_blocks,
                                 (long) compptr->v_samp_factor) * DCTSIZE,
          (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
     }
 #else
     ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
 #endif
   } else {
 #ifdef FULL_MAIN_BUFFER_SUPPORTED
-    main->whole_image[0] = NULL; /* flag for no virtual arrays */
+    main_ptr->whole_image[0] = NULL; /* flag for no virtual arrays */
 #endif
     /* Allocate a strip buffer for each component */
     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
          ci++, compptr++) {
-      main->buffer[ci] = (*cinfo->mem->alloc_sarray)
+      main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray)
         ((j_common_ptr) cinfo, JPOOL_IMAGE,
          compptr->width_in_blocks * DCTSIZE,
          (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
     }
   }
 }