jfdctfst.c File Reference

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

Include dependency graph for jfdctfst.c:

Go to the source code of this file.

Defines
#define	JPEG_INTERNALS
#define	CONST_BITS   8
#define	FIX_0_382683433   FIX(0.382683433)
#define	FIX_0_541196100   FIX(0.541196100)
#define	FIX_0_707106781   FIX(0.707106781)
#define	FIX_1_306562965   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)

---

Define Documentation

#define CONST_BITS   8

Definition at line 68 of file jfdctfst.c.

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

Definition at line 98 of file jfdctfst.c.

#define FIX_0_382683433   FIX(0.382683433)

Definition at line 84 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

#define FIX_0_541196100   FIX(0.541196100)

Definition at line 85 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

#define FIX_0_707106781   FIX(0.707106781)

Definition at line 86 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

#define FIX_1_306562965   FIX(1.306562965)

Definition at line 87 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

#define JPEG_INTERNALS

Definition at line 33 of file jfdctfst.c.

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

Definition at line 106 of file jfdctfst.c.

Referenced by jpeg_fdct_ifast().

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Function Documentation

jpeg_fdct_ifast

(

DCTELEM *

data

)

Definition at line 114 of file jfdctfst.c.

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

Referenced by jinit_forward_dct().