jutils.c File Reference

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

Include dependency graph for jutils.c:

Go to the source code of this file.

Macros
#define	JPEG_INTERNALS
#define	FMEMCOPY(dest, src, size)   MEMCOPY(dest,src,size)

Functions
	jdiv_round_up (long a, long b)
	jround_up (long a, long b)
	jcopy_sample_rows (JSAMPARRAY input_array, int source_row, JSAMPARRAY output_array, int dest_row, int num_rows, JDIMENSION num_cols)
	jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row, JDIMENSION num_blocks)

Variables
const int	jpeg_natural_order [DCTSIZE2+16]
const int	jpeg_natural_order7 [7 *7+16]
const int	jpeg_natural_order6 [6 *6+16]
const int	jpeg_natural_order5 [5 *5+16]
const int	jpeg_natural_order4 [4 *4+16]
const int	jpeg_natural_order3 [3 *3+16]
const int	jpeg_natural_order2 [2 *2+16]

Macro Definition Documentation

FMEMCOPY

#define FMEMCOPY	(		dest,
			src,
			size
	)		MEMCOPY(dest,src,size)

Definition at line 152 of file jutils.c.

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 15 of file jutils.c.

Function Documentation

jcopy_block_row()

jcopy_block_row	(	JBLOCKROW	input_row,
		JBLOCKROW	output_row,
		JDIMENSION	num_blocks
	)

Definition at line 211 of file jutils.c.

{
#ifdef FMEMCOPY
  FMEMCOPY(output_row, input_row, (size_t) num_blocks * (DCTSIZE2 * SIZEOF(JCOEF)));
#else
  register JCOEFPTR inptr, outptr;
  register long count;
 
  inptr = (JCOEFPTR) input_row;
  outptr = (JCOEFPTR) output_row;
  for (count = (long) num_blocks * DCTSIZE2; count > 0; count--) {
    *outptr++ = *inptr++;
  }
#endif
}

jcopy_sample_rows()

jcopy_sample_rows	(	JSAMPARRAY	input_array,
		int	source_row,
		JSAMPARRAY	output_array,
		int	dest_row,
		int	num_rows,
		JDIMENSION	num_cols
	)

Definition at line 177 of file jutils.c.

{
  register JSAMPROW inptr, outptr;
#ifdef FMEMCOPY
  register size_t count = (size_t) num_cols * SIZEOF(JSAMPLE);
#else
  register JDIMENSION count;
#endif
  register int row;
 
  input_array += source_row;
  output_array += dest_row;
 
  for (row = num_rows; row > 0; row--) {
    inptr = *input_array++;
    outptr = *output_array++;
#ifdef FMEMCOPY
    FMEMCOPY(outptr, inptr, count);
#else
    for (count = num_cols; count > 0; count--)
      *outptr++ = *inptr++; /* needn't bother with GETJSAMPLE() here */
#endif
  }
}

Referenced by expand_bottom_edge(), fullsize_downsample(), grayscale_convert(), h2v2_upsample(), and int_upsample().

jdiv_round_up()

jdiv_round_up	(	long	a,
		long	b
	)

Definition at line 124 of file jutils.c.

{
  return (a + b - 1L) / b;
}

Referenced by initial_setup(), jpeg_calc_jpeg_dimensions(), jpeg_calc_output_dimensions(), and per_scan_setup().

jround_up()

jround_up	(	long	a,
		long	b
	)

Definition at line 133 of file jutils.c.

{
  a += b - 1L;
  return a - (a % b);
}

Referenced by jinit_c_coef_controller(), jinit_c_main_controller(), jinit_d_coef_controller(), jinit_d_post_controller(), and jinit_upsampler().

Variable Documentation

jpeg_natural_order

const int jpeg_natural_order[DCTSIZE2+16]

Initial value:

= {
  0,  1,  8, 16,  9,  2,  3, 10,
 17, 24, 32, 25, 18, 11,  4,  5,
 12, 19, 26, 33, 40, 48, 41, 34,
 27, 20, 13,  6,  7, 14, 21, 28,
 35, 42, 49, 56, 57, 50, 43, 36,
 29, 22, 15, 23, 30, 37, 44, 51,
 58, 59, 52, 45, 38, 31, 39, 46,
 53, 60, 61, 54, 47, 55, 62, 63,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 54 of file jutils.c.

Referenced by decode_mcu(), get_dqt(), initial_setup(), and jpeg_CreateCompress().

jpeg_natural_order2

const int jpeg_natural_order2[2 *2+16]

Initial value:

= {
  0,  1,  8,  9,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 112 of file jutils.c.

Referenced by get_dqt(), and initial_setup().

jpeg_natural_order3

const int jpeg_natural_order3[3 *3+16]

Initial value:

= {
  0,  1,  8, 16,  9,  2, 10, 17,
 18,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 105 of file jutils.c.

Referenced by get_dqt(), and initial_setup().

jpeg_natural_order4

const int jpeg_natural_order4[4 *4+16]

Initial value:

= {
  0,  1,  8, 16,  9,  2,  3, 10,
 17, 24, 25, 18, 11, 19, 26, 27,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 98 of file jutils.c.

Referenced by get_dqt(), and initial_setup().

jpeg_natural_order5

const int jpeg_natural_order5[5 *5+16]

Initial value:

= {
  0,  1,  8, 16,  9,  2,  3, 10,
 17, 24, 32, 25, 18, 11,  4, 12,
 19, 26, 33, 34, 27, 20, 28, 35,
 36,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 89 of file jutils.c.

Referenced by get_dqt(), and initial_setup().

jpeg_natural_order6

const int jpeg_natural_order6[6 *6+16]

Initial value:

= {
  0,  1,  8, 16,  9,  2,  3, 10,
 17, 24, 32, 25, 18, 11,  4,  5,
 12, 19, 26, 33, 40, 41, 34, 27,
 20, 13, 21, 28, 35, 42, 43, 36,
 29, 37, 44, 45,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 79 of file jutils.c.

Referenced by get_dqt(), and initial_setup().

jpeg_natural_order7

const int jpeg_natural_order7[7 *7+16]

Initial value:

= {
  0,  1,  8, 16,  9,  2,  3, 10,
 17, 24, 32, 25, 18, 11,  4,  5,
 12, 19, 26, 33, 40, 48, 41, 34,
 27, 20, 13,  6, 14, 21, 28, 35,
 42, 49, 50, 43, 36, 29, 22, 30,
 37, 44, 51, 52, 45, 38, 46, 53,
 54,
 63, 63, 63, 63, 63, 63, 63, 63, 
 63, 63, 63, 63, 63, 63, 63, 63
}

Definition at line 67 of file jutils.c.

Referenced by get_dqt(), and initial_setup().