jidctfst.c File Reference

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

Go to the source code of this file.

Defines
#define	JPEG_INTERNALS
#define	CONST_BITS   8
#define	PASS1_BITS   2
#define	FIX_1_082392200   ((INT32) 277)
#define	FIX_1_414213562   ((INT32) 362)
#define	FIX_1_847759065   ((INT32) 473)
#define	FIX_2_613125930   ((INT32) 669)
#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)

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Define Documentation

#define CONST_BITS   8

Definition at line 77 of file jidctfst.c.

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

Definition at line 129 of file jidctfst.c.

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

Definition at line 111 of file jidctfst.c.

#define FIX_1_082392200   ((INT32) 277)

Definition at line 92 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

#define FIX_1_414213562   ((INT32) 362)

Definition at line 93 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

#define FIX_1_847759065   ((INT32) 473)

Definition at line 94 of file jidctfst.c.

#define FIX_2_613125930   ((INT32) 669)

Definition at line 95 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

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

Definition at line 159 of file jidctfst.c.

Referenced by jpeg_idct_ifast().

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

Definition at line 153 of file jidctfst.c.

#define ISHIFT_TEMPS

Definition at line 152 of file jidctfst.c.

#define JPEG_INTERNALS

Definition at line 35 of file jidctfst.c.

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

Definition at line 119 of file jidctfst.c.

#define PASS1_BITS   2

Definition at line 78 of file jidctfst.c.

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Function Documentation

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 DCTSIZE, DCTSIZE2, DEQUANTIZE, FIX_1_082392200, FIX_1_414213562, FIX_1_847759065, FIX_2_613125930, for(), IDCT_range_limit, IDESCALE, int, ISHIFT_TEMPS, MULTIPLY, PASS1_BITS, RANGE_MASK, and SHIFT_TEMPS.

Referenced by start_pass().

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