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_t) 1)
#define	CONST_SCALE   (ONE << CONST_BITS)
#define	FIX(x)   ((int32_t) ((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_t	DCTELEM
typedef MULTIPLIER	ISLOW_MULT_TYPE
typedef int32_t	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))

Variables
jpeg_component_info *	compptr
jpeg_component_info JCOEFPTR	coef_block
jpeg_component_info JCOEFPTR JSAMPARRAY	output_buf
jpeg_component_info JCOEFPTR JSAMPARRAY JDIMENSION	output_col

Macro Definition Documentation

#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_t) 1)

#define CONST_SCALE   (ONE << CONST_BITS)

#define FIX

(

x

)

((int32_t) ((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))

Typedef Documentation

typedef int32_t DCTELEM

typedef MULTIPLIER ISLOW_MULT_TYPE

typedef int32_t IFAST_MULT_TYPE

typedef FAST_FLOAT FLOAT_MULT_TYPE

Function Documentation

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

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

EXTERN

(

void

)

Variable Documentation

jpeg_component_info * compptr

jpeg_component_info JCOEFPTR coef_block

jpeg_component_info JCOEFPTR JSAMPARRAY output_buf

jpeg_component_info JCOEFPTR JSAMPARRAY JDIMENSION output_col