jdct.h File Reference

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Defines
#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, JSAMPARRAY sample_data, JDIMENSION start_col))
typedef	JMETHOD (void, float_DCT_method_ptr,(FAST_FLOAT *data, JSAMPARRAY sample_data, JDIMENSION start_col))
	EXTERN (void) jpeg_fdct_islow JPP((DCTELEM *data
Variables
JSAMPARRAY	sample_data
JSAMPARRAY JDIMENSION	start_col
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