jfdctfst.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	FIX_0_382683433   ((INT32) 98) /* FIX(0.382683433) */
#define	FIX_0_541196100   ((INT32) 139) /* FIX(0.541196100) */
#define	FIX_0_707106781   ((INT32) 181) /* FIX(0.707106781) */
#define	FIX_1_306562965   ((INT32) 334) /* FIX(1.306562965) */
#define	DESCALE(x, n)   RIGHT_SHIFT(x, n)
#define	MULTIPLY(var, const)   ((DCTELEM) DESCALE((var) * (const), CONST_BITS))

Functions
	jpeg_fdct_ifast (DCTELEM *data)

Macro Definition Documentation

CONST_BITS

#define CONST_BITS   8

Definition at line 68 of file jfdctfst.c.

DESCALE

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

Definition at line 98 of file jfdctfst.c.

FIX_0_382683433

#define FIX_0_382683433   ((INT32) 98) /* FIX(0.382683433) */

Definition at line 79 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

FIX_0_541196100

#define FIX_0_541196100   ((INT32) 139) /* FIX(0.541196100) */

Definition at line 80 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

FIX_0_707106781

#define FIX_0_707106781   ((INT32) 181) /* FIX(0.707106781) */

Definition at line 81 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

FIX_1_306562965

#define FIX_1_306562965   ((INT32) 334) /* FIX(1.306562965) */

Definition at line 82 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 33 of file jfdctfst.c.

MULTIPLY

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

Definition at line 106 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

Function Documentation

jpeg_fdct_ifast()

jpeg_fdct_ifast

(

DCTELEM *

data

)

Definition at line 114 of file jfdctfst.c.

References dataptr, DCTSIZE, FIX_0_382683433, FIX_0_541196100, FIX_0_707106781, FIX_1_306562965, MULTIPLY, and SHIFT_TEMPS.

Referenced by jinit_forward_dct().