jidctfst.c File Reference

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

Go to the source code of this file.

Macros
#define	JPEG_INTERNALS
#define	CONST_BITS   8
#define	PASS1_BITS   2
#define	FIX_1_082392200   ((INT32) 277) /* FIX(1.082392200) */
#define	FIX_1_414213562   ((INT32) 362) /* FIX(1.414213562) */
#define	FIX_1_847759065   ((INT32) 473) /* FIX(1.847759065) */
#define	FIX_2_613125930   ((INT32) 669) /* FIX(2.613125930) */
#define	DESCALE(x, n)   RIGHT_SHIFT(x, n)
#define	MULTIPLY(var, const)   ((DCTELEM) DESCALE((var) * (const), CONST_BITS))
#define	DEQUANTIZE(coef, quantval)   (((IFAST_MULT_TYPE) (coef)) * (quantval))
#define	ISHIFT_TEMPS
#define	IRIGHT_SHIFT(x, shft)   ((x) >> (shft))
#define	IDESCALE(x, n)   ((int) IRIGHT_SHIFT(x, n))

Functions
	jpeg_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)

Macro Definition Documentation

CONST_BITS

#define CONST_BITS   8

Definition at line 77 of file jidctfst.c.

DEQUANTIZE

#define DEQUANTIZE	(		coef,
			quantval
	)		(((IFAST_MULT_TYPE) (coef)) * (quantval))

Definition at line 129 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

DESCALE

#define DESCALE	(		x,
			n
	)		RIGHT_SHIFT(x, n)

Definition at line 111 of file jidctfst.c.

FIX_1_082392200

#define FIX_1_082392200   ((INT32) 277) /* FIX(1.082392200) */

Definition at line 92 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

FIX_1_414213562

#define FIX_1_414213562   ((INT32) 362) /* FIX(1.414213562) */

Definition at line 93 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

FIX_1_847759065

#define FIX_1_847759065   ((INT32) 473) /* FIX(1.847759065) */

Definition at line 94 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

FIX_2_613125930

#define FIX_2_613125930   ((INT32) 669) /* FIX(2.613125930) */

Definition at line 95 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

IDESCALE

#define IDESCALE	(		x,
			n
	)		((int) IRIGHT_SHIFT(x, n))

Definition at line 159 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

IRIGHT_SHIFT

#define IRIGHT_SHIFT	(		x,
			shft
	)		((x) >> (shft))

Definition at line 153 of file jidctfst.c.

ISHIFT_TEMPS

#define ISHIFT_TEMPS

Definition at line 152 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 35 of file jidctfst.c.

MULTIPLY

#define MULTIPLY	(		var,
			const
	)		((DCTELEM) DESCALE((var) * (const), CONST_BITS))

Definition at line 119 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

PASS1_BITS

#define PASS1_BITS   2

Definition at line 78 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

Function Documentation

jpeg_idct_ifast()

jpeg_idct_ifast	(	j_decompress_ptr	cinfo,
		jpeg_component_info *	compptr,
		JCOEFPTR	coef_block,
		JSAMPARRAY	output_buf,
		JDIMENSION	output_col
	)

Definition at line 168 of file jidctfst.c.

References coef_block, jpeg_component_info::dct_table, DCTSIZE, DCTSIZE2, DEQUANTIZE, FIX_1_082392200, FIX_1_414213562, FIX_1_847759065, FIX_2_613125930, for(), IDCT_range_limit, IDESCALE, int, ISHIFT_TEMPS, MULTIPLY, output_col, PASS1_BITS, RANGE_MASK, and SHIFT_TEMPS.

Referenced by start_pass().