jdct.h File Reference

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Macros
#define	IFAST_SCALE_BITS   13 /* fractional bits in scale factors */
#define	IDCT_range_limit(cinfo)   ((cinfo)->sample_range_limit + CENTERJSAMPLE)
#define	RANGE_MASK   (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */
#define	ONE   ((INT32) 1)
#define	CONST_SCALE   (ONE << CONST_BITS)
#define	FIX(x)   ((INT32) ((x) * CONST_SCALE + 0.5))
#define	DESCALE(x, n)   RIGHT_SHIFT((x) + (ONE << ((n)-1)), n)
#define	MULTIPLY16C16(var, const)   ((var) * (const))
#define	MULTIPLY16V16(var1, var2)   ((var1) * (var2))

Typedefs
typedef INT32	DCTELEM
typedef MULTIPLIER	ISLOW_MULT_TYPE
typedef INT32	IFAST_MULT_TYPE
typedef FAST_FLOAT	FLOAT_MULT_TYPE

Functions
typedef	JMETHOD (void, forward_DCT_method_ptr,(DCTELEM *data))
typedef	JMETHOD (void, float_DCT_method_ptr,(FAST_FLOAT *data))
EXTERN void jpeg_fdct_islow	JPP ((DCTELEM *data))
EXTERN void jpeg_fdct_float	JPP ((FAST_FLOAT *data))
EXTERN void jpeg_idct_islow	JPP ((j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col))

Macro Definition Documentation

#define CONST_SCALE   (ONE << CONST_BITS)

Definition at line 132 of file jdct.h.

#define DESCALE	(		x,
			n
	)		RIGHT_SHIFT((x) + (ONE << ((n)-1)), n)

Definition at line 146 of file jdct.h.

#define FIX

(

x

)

((INT32) ((x) * CONST_SCALE + 0.5))

Definition at line 139 of file jdct.h.

#define IDCT_range_limit

(

cinfo

)

((cinfo)->sample_range_limit + CENTERJSAMPLE)

Definition at line 76 of file jdct.h.

#define IFAST_SCALE_BITS   13 /* fractional bits in scale factors */

Definition at line 62 of file jdct.h.

#define MULTIPLY16C16	(		var,
			const
	)		((var) * (const))

Definition at line 165 of file jdct.h.

#define MULTIPLY16V16	(		var1,
			var2
	)		((var1) * (var2))

Definition at line 175 of file jdct.h.

#define ONE   ((INT32) 1)

Definition at line 131 of file jdct.h.

#define RANGE_MASK   (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */

Definition at line 78 of file jdct.h.

Typedef Documentation

typedef INT32 DCTELEM

Definition at line 32 of file jdct.h.

typedef FAST_FLOAT FLOAT_MULT_TYPE

Definition at line 64 of file jdct.h.

typedef INT32 IFAST_MULT_TYPE

Definition at line 61 of file jdct.h.

typedef MULTIPLIER ISLOW_MULT_TYPE

Definition at line 56 of file jdct.h.

Function Documentation

typedef JMETHOD	(	void	,
		forward_DCT_method_ptr	,
		(DCTELEM *data)
	)

typedef JMETHOD	(	void	,
		float_DCT_method_ptr	,
		(FAST_FLOAT *data)
	)

EXTERN void jpeg_fdct_ifast JPP

(

(DCTELEM *data)

)

EXTERN void jpeg_fdct_float JPP

(

(FAST_FLOAT *data)

)

EXTERN void jpeg_idct_1x1 JPP

(

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

)