jcmainct.c File Reference

#include "jinclude.h"
#include "jpeglib.h"

Include dependency graph for jcmainct.c:

Go to the source code of this file.

Classes
struct	my_main_controller

Macros
#define	JPEG_INTERNALS

Typedefs
typedef my_main_controller *	my_main_ptr

Functions
	METHODDEF (void)
	process_data_simple_main (j_compress_ptr cinfo, JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail)
	jinit_c_main_controller (j_compress_ptr cinfo, boolean need_full_buffer)

Macro Definition Documentation

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 14 of file jcmainct.c.

Typedef Documentation

my_main_ptr

typedef my_main_controller* my_main_ptr

Definition at line 51 of file jcmainct.c.

Function Documentation

jinit_c_main_controller()

jinit_c_main_controller	(	j_compress_ptr	cinfo,
		boolean	need_full_buffer
	)

Definition at line 248 of file jcmainct.c.

{
  my_main_ptr mainp;
  int ci;
  jpeg_component_info *compptr;
 
  mainp = (my_main_ptr)
    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
                SIZEOF(my_main_controller));
  cinfo->main = &mainp->pub;
  mainp->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++) {
      mainp->whole_image[ci] = (*cinfo->mem->request_virt_sarray)
    ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
     compptr->width_in_blocks * ((JDIMENSION) compptr->DCT_h_scaled_size),
     ((JDIMENSION) jround_up((long) compptr->height_in_blocks,
                 (long) compptr->v_samp_factor)) *
     ((JDIMENSION) cinfo->min_DCT_v_scaled_size),
     (JDIMENSION) (compptr->v_samp_factor * compptr->DCT_v_scaled_size));
    }
#else
    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
#endif
  } else {
#ifdef FULL_MAIN_BUFFER_SUPPORTED
    mainp->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++) {
      mainp->buffer[ci] = (*cinfo->mem->alloc_sarray)
    ((j_common_ptr) cinfo, JPOOL_IMAGE,
     compptr->width_in_blocks * ((JDIMENSION) compptr->DCT_h_scaled_size),
     (JDIMENSION) (compptr->v_samp_factor * compptr->DCT_v_scaled_size));
    }
  }
}

Referenced by jinit_compress_master().

METHODDEF()

METHODDEF

(

void

)

Definition at line 55 of file jcmainct.c.

{
  my_main_ptr mainp = (my_main_ptr) cinfo->main;
 
  /* Do nothing in raw-data mode. */
  if (cinfo->raw_data_in)
    return;
 
  mainp->cur_iMCU_row = 0;  /* initialize counters */
  mainp->rowgroup_ctr = 0;
  mainp->suspended = FALSE;
  mainp->pass_mode = pass_mode; /* save mode for use by process_data */
 
  switch (pass_mode) {
  case JBUF_PASS_THRU:
#ifdef FULL_MAIN_BUFFER_SUPPORTED
    if (mainp->whole_image[0] != NULL)
      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
#endif
    mainp->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 (mainp->whole_image[0] == NULL)
      ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
    mainp->pub.process_data = process_data_buffer_main;
    break;
#endif
  default:
    ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
    break;
  }
}

process_data_simple_main()

process_data_simple_main	(	j_compress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JDIMENSION *	in_row_ctr,
		JDIMENSION	in_rows_avail
	)

Definition at line 114 of file jcmainct.c.

{
  my_main_ptr mainp = (my_main_ptr) cinfo->main;
 
  while (mainp->cur_iMCU_row < cinfo->total_iMCU_rows) {
    /* Read input data if we haven't filled the main buffer yet */
    if (mainp->rowgroup_ctr < (JDIMENSION) cinfo->min_DCT_v_scaled_size)
      (*cinfo->prep->pre_process_data) (cinfo,
                    input_buf, in_row_ctr, in_rows_avail,
                    mainp->buffer, &mainp->rowgroup_ctr,
                    (JDIMENSION) cinfo->min_DCT_v_scaled_size);
 
    /* 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 (mainp->rowgroup_ctr != (JDIMENSION) cinfo->min_DCT_v_scaled_size)
      return;
 
    /* Send the completed row to the compressor */
    if (! (*cinfo->coef->compress_data) (cinfo, mainp->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 (! mainp->suspended) {
    (*in_row_ctr)--;
    mainp->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 (mainp->suspended) {
      (*in_row_ctr)++;
      mainp->suspended = FALSE;
    }
    mainp->rowgroup_ctr = 0;
    mainp->cur_iMCU_row++;
  }
}