Update to libjpeg_turbo 1.4.90

jcmainct.c

 /*
  * jcmainct.c
  *
+ * This file was 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 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.
  */
 
 #define JPEG_INTERNALS
 #include "jinclude.h"
 #include "jpeglib.h"
 
 
-/* Note: currently, there is no operating mode in which a full-image buffer
- * is needed at this step.  If there were, that mode could not be used with
- * "raw data" input, since this module is bypassed in that case.  However,
- * we've left the code here for possible use in special applications.
- */
-#undef FULL_MAIN_BUFFER_SUPPORTED
-
-
 /* Private buffer controller object */
 
 typedef struct {
   struct jpeg_c_main_controller pub; /* public fields */
 
-  JDIMENSION cur_iMCU_row;      /* number of current iMCU row */
-  JDIMENSION rowgroup_ctr;      /* counts row groups received in iMCU row */
-  boolean suspended;            /* remember if we suspended output */
-  J_BUF_MODE pass_mode;         /* current operating mode */
+  JDIMENSION cur_iMCU_row;      /* number of current iMCU row */
+  JDIMENSION rowgroup_ctr;      /* counts row groups received in iMCU row */
+  boolean suspended;            /* remember if we suspended output */
+  J_BUF_MODE pass_mode;         /* current operating mode */
 
   /* If using just a strip buffer, this points to the entire set of buffers
    * (we allocate one for each component).  In the full-image case, this
    * points to the currently accessible strips of the virtual arrays.
    */
   JSAMPARRAY buffer[MAX_COMPONENTS];
-
-#ifdef FULL_MAIN_BUFFER_SUPPORTED
-  /* If using full-image storage, this array holds pointers to virtual-array
-   * control blocks for each component.  Unused if not full-image storage.
-   */
-  jvirt_sarray_ptr whole_image[MAX_COMPONENTS];
-#endif
 } my_main_controller;
 
-typedef my_main_controller * my_main_ptr;
+typedef my_main_controller *my_main_ptr;
 
 
 /* Forward declarations */
 METHODDEF(void) process_data_simple_main
-        JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf,
-             JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail));
-#ifdef FULL_MAIN_BUFFER_SUPPORTED
-METHODDEF(void) process_data_buffer_main
-        JPP((j_compress_ptr cinfo, JSAMPARRAY input_buf,
-             JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail));
-#endif
+        (j_compress_ptr cinfo, JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+         JDIMENSION in_rows_avail);
 
 
 /*
  * Initialize for a processing pass.
  */
 
 METHODDEF(void)
 start_pass_main (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
 {
   my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
 
   /* Do nothing in raw-data mode. */
   if (cinfo->raw_data_in)
     return;
 
-  main_ptr->cur_iMCU_row = 0;   /* initialize counters */
+  if (pass_mode != JBUF_PASS_THRU)
+    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
+
+  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_ptr->whole_image[0] != NULL)
-      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-#endif
-    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_ptr->whole_image[0] == NULL)
-      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-    main_ptr->pub.process_data = process_data_buffer_main;
-    break;
-#endif
-  default:
-    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-    break;
-  }
+  main_ptr->pass_mode = pass_mode;      /* save mode for use by process_data */
+  main_ptr->pub.process_data = process_data_simple_main;
 }
 
 
 /*
  * 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)
+                          JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
+                          JDIMENSION in_rows_avail)
 {
   my_main_ptr main_ptr = (my_main_ptr) cinfo->main;
 
   while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
     /* Read input data if we haven't filled the main buffer yet */
     if (main_ptr->rowgroup_ctr < DCTSIZE)
       (*cinfo->prep->pre_process_data) (cinfo,
-                                        input_buf, in_row_ctr, in_rows_avail,
-                                        main_ptr->buffer, &main_ptr->rowgroup_ctr,
-                                        (JDIMENSION) DCTSIZE);
+                                        input_buf, in_row_ctr, in_rows_avail,
+                                        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_ptr->rowgroup_ctr != DCTSIZE)
       return;
 
     /* Send the completed row to the compressor */
     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_ptr->suspended) {
-        (*in_row_ctr)--;
-        main_ptr->suspended = TRUE;
+        (*in_row_ctr)--;
+        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_ptr->suspended) {
       (*in_row_ctr)++;
       main_ptr->suspended = FALSE;
     }
     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_ptr = (my_main_ptr) cinfo->main;
-  int ci;
-  jpeg_component_info *compptr;
-  boolean writing = (main_ptr->pass_mode != JBUF_CRANK_DEST);
-
-  while (main_ptr->cur_iMCU_row < cinfo->total_iMCU_rows) {
-    /* Realign the virtual buffers if at the start of an iMCU row. */
-    if (main_ptr->rowgroup_ctr == 0) {
-      for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
-           ci++, compptr++) {
-        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_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_ptr->buffer, &main_ptr->rowgroup_ctr,
-                                        (JDIMENSION) DCTSIZE);
-      /* Return to application if we need more data to fill the iMCU row. */
-      if (main_ptr->rowgroup_ctr < DCTSIZE)
-        return;
-    }
-
-    /* Emit data, unless this is a sink-only pass. */
-    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_ptr->suspended) {
-          (*in_row_ctr)--;
-          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_ptr->suspended) {
-        (*in_row_ctr)++;
-        main_ptr->suspended = FALSE;
-      }
-    }
-
-    /* If get here, we are done with this iMCU row.  Mark buffer empty. */
-    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_ptr;
   int ci;
   jpeg_component_info *compptr;
 
   main_ptr = (my_main_ptr)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
-                                SIZEOF(my_main_controller));
+                                sizeof(my_main_controller));
   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_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_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++) {
+         ci++, compptr++) {
       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));
+        ((j_common_ptr) cinfo, JPOOL_IMAGE,
+         compptr->width_in_blocks * DCTSIZE,
+         (JDIMENSION) (compptr->v_samp_factor * DCTSIZE));
     }
   }
 }