jquant1.c File Reference

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

Go to the source code of this file.

Classes
struct	my_cquantizer

Macros
#define	JPEG_INTERNALS
#define	ODITHER_SIZE   16 /* dimension of dither matrix */
#define	ODITHER_CELLS   (ODITHER_SIZE*ODITHER_SIZE) /* # cells in matrix */
#define	ODITHER_MASK   (ODITHER_SIZE-1) /* mask for wrapping around counters */
#define	MAX_Q_COMPS   4 /* max components I can handle */

Typedefs
typedef int	ODITHER_MATRIX[ODITHER_SIZE][ODITHER_SIZE]
typedef int(*	ODITHER_MATRIX_PTR)[ODITHER_SIZE]
typedef INT16	FSERROR
typedef int	LOCFSERROR
typedef FSERROR FAR *	FSERRPTR
typedef my_cquantizer *	my_cquantize_ptr

Functions
	select_ncolors (j_decompress_ptr cinfo, int Ncolors[])
	output_value (j_decompress_ptr, int, int j, int maxj)
	largest_input_value (j_decompress_ptr, int, int j, int maxj)
	create_colormap (j_decompress_ptr cinfo)
	create_colorindex (j_decompress_ptr cinfo)
	make_odither_array (j_decompress_ptr cinfo, int ncolors)
	create_odither_tables (j_decompress_ptr cinfo)
	color_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	color_quantize3 (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	quantize3_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	quantize_fs_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	alloc_fs_workspace (j_decompress_ptr cinfo)
	start_pass_1_quant (j_decompress_ptr cinfo, boolean)
	finish_pass_1_quant (j_decompress_ptr)
	new_color_map_1_quant (j_decompress_ptr cinfo)
	jinit_1pass_quantizer (j_decompress_ptr cinfo)

Variables
static const UINT8	base_dither_matrix [ODITHER_SIZE][ODITHER_SIZE]

Macro Definition Documentation

JPEG_INTERNALS

#define JPEG_INTERNALS

MAX_Q_COMPS

#define MAX_Q_COMPS   4 /* max components I can handle */

ODITHER_CELLS

#define ODITHER_CELLS   (ODITHER_SIZE*ODITHER_SIZE) /* # cells in matrix */

ODITHER_MASK

#define ODITHER_MASK   (ODITHER_SIZE-1) /* mask for wrapping around counters */

ODITHER_SIZE

#define ODITHER_SIZE   16 /* dimension of dither matrix */

Typedef Documentation

FSERROR

typedef INT16 FSERROR

FSERRPTR

typedef FSERROR FAR* FSERRPTR

LOCFSERROR

typedef int LOCFSERROR

my_cquantize_ptr

typedef my_cquantizer* my_cquantize_ptr

ODITHER_MATRIX

typedef int ODITHER_MATRIX[ODITHER_SIZE][ODITHER_SIZE]

ODITHER_MATRIX_PTR

typedef int(* ODITHER_MATRIX_PTR)[ODITHER_SIZE]

Function Documentation

alloc_fs_workspace()

alloc_fs_workspace

(

j_decompress_ptr

cinfo

)

color_quantize()

color_quantize	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows )

color_quantize3()

color_quantize3	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows )

create_colorindex()

create_colorindex

(

j_decompress_ptr

cinfo

)

create_colormap()

create_colormap

(

j_decompress_ptr

cinfo

)

create_odither_tables()

create_odither_tables

(

j_decompress_ptr

cinfo

)

finish_pass_1_quant()

finish_pass_1_quant

(

j_decompress_ptr

)

jinit_1pass_quantizer()

jinit_1pass_quantizer

(

j_decompress_ptr

cinfo

)

largest_input_value()

largest_input_value	(	j_decompress_ptr	,
		int	,
		int	j,
		int	maxj )

make_odither_array()

make_odither_array	(	j_decompress_ptr	cinfo,
		int	ncolors )

new_color_map_1_quant()

new_color_map_1_quant

(

j_decompress_ptr

cinfo

)

output_value()

output_value	(	j_decompress_ptr	,
		int	,
		int	j,
		int	maxj )

quantize3_ord_dither()

quantize3_ord_dither	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows )

quantize_fs_dither()

quantize_fs_dither	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows )

quantize_ord_dither()

quantize_ord_dither	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows )

select_ncolors()

select_ncolors	(	j_decompress_ptr	cinfo,
		int	Ncolors[] )

start_pass_1_quant()

start_pass_1_quant	(	j_decompress_ptr	cinfo,
		boolean	)

Variable Documentation

base_dither_matrix

const UINT8 base_dither_matrix[ODITHER_SIZE][ODITHER_SIZE]

static

Initial value:

                                      = {
  
  {   0,192, 48,240, 12,204, 60,252,  3,195, 51,243, 15,207, 63,255 },
  { 128, 64,176,112,140, 76,188,124,131, 67,179,115,143, 79,191,127 },
  {  32,224, 16,208, 44,236, 28,220, 35,227, 19,211, 47,239, 31,223 },
  { 160, 96,144, 80,172,108,156, 92,163, 99,147, 83,175,111,159, 95 },
  {   8,200, 56,248,  4,196, 52,244, 11,203, 59,251,  7,199, 55,247 },
  { 136, 72,184,120,132, 68,180,116,139, 75,187,123,135, 71,183,119 },
  {  40,232, 24,216, 36,228, 20,212, 43,235, 27,219, 39,231, 23,215 },
  { 168,104,152, 88,164,100,148, 84,171,107,155, 91,167,103,151, 87 },
  {   2,194, 50,242, 14,206, 62,254,  1,193, 49,241, 13,205, 61,253 },
  { 130, 66,178,114,142, 78,190,126,129, 65,177,113,141, 77,189,125 },
  {  34,226, 18,210, 46,238, 30,222, 33,225, 17,209, 45,237, 29,221 },
  { 162, 98,146, 82,174,110,158, 94,161, 97,145, 81,173,109,157, 93 },
  {  10,202, 58,250,  6,198, 54,246,  9,201, 57,249,  5,197, 53,245 },
  { 138, 74,186,122,134, 70,182,118,137, 73,185,121,133, 69,181,117 },
  {  42,234, 26,218, 38,230, 22,214, 41,233, 25,217, 37,229, 21,213 },
  { 170,106,154, 90,166,102,150, 86,169,105,153, 89,165,101,149, 85 }
}