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)
#define	MULTIPLY(var, const)
#define	DEQUANTIZE(coef, quantval)
#define	ISHIFT_TEMPS
#define	IRIGHT_SHIFT(x, shft)
#define	IDESCALE(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

DEQUANTIZE

#define DEQUANTIZE	(		coef,
			quantval )

Value:

(((IFAST_MULT_TYPE) (coef)) * (quantval))

DESCALE

#define DESCALE	(		x,
			n )

Value:

RIGHT_SHIFT(x, n)

FIX_1_082392200

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

FIX_1_414213562

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

FIX_1_847759065

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

FIX_2_613125930

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

IDESCALE

#define IDESCALE	(		x,
			n )

Value:

((int) IRIGHT_SHIFT(x, n))

IRIGHT_SHIFT

#define IRIGHT_SHIFT	(		x,
			shft )

Value:

((x) >> (shft))

ISHIFT_TEMPS

#define ISHIFT_TEMPS

JPEG_INTERNALS

#define JPEG_INTERNALS

MULTIPLY

#define MULTIPLY	(		var,
			const )

Value:

((DCTELEM) DESCALE((var) * (const), CONST_BITS))

PASS1_BITS

#define PASS1_BITS   2

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 )