jdct.h File Reference

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Macros
#define	IFAST_SCALE_BITS   13 /* fractional bits in scale factors */
#define	RANGE_MASK   (RANGE_CENTER * 2 - 1)
#define	RANGE_SUBSET   (RANGE_CENTER - CENTERJSAMPLE)
#define	IDCT_range_limit(cinfo)   ((cinfo)->sample_range_limit - RANGE_SUBSET)
#define	ONE   ((INT32) 1)
#define	CONST_SCALE   (ONE << CONST_BITS)
#define	FIX(x)   ((INT32) ((x) * CONST_SCALE + 0.5))
#define	MULTIPLY16C16(var, const)   ((var) * (const))
#define	MULTIPLY16V16(var1, var2)   ((var1) * (var2))
#define	ISHIFT_TEMPS
#define	IRIGHT_SHIFT(x, shft)   ((x) >> (shft))

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

Macro Definition Documentation

CONST_SCALE

#define CONST_SCALE   (ONE << CONST_BITS)

Definition at line 352 of file jdct.h.

FIX

#define FIX

(

x

)

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

Definition at line 359 of file jdct.h.

IDCT_range_limit

#define IDCT_range_limit

(

cinfo

)

((cinfo)->sample_range_limit - RANGE_SUBSET)

Definition at line 90 of file jdct.h.

IFAST_SCALE_BITS

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

Definition at line 72 of file jdct.h.

IRIGHT_SHIFT

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

Definition at line 408 of file jdct.h.

ISHIFT_TEMPS

#define ISHIFT_TEMPS

Definition at line 407 of file jdct.h.

MULTIPLY16C16

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

Definition at line 378 of file jdct.h.

MULTIPLY16V16

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

Definition at line 388 of file jdct.h.

ONE

#define ONE   ((INT32) 1)

Definition at line 351 of file jdct.h.

RANGE_MASK

#define RANGE_MASK   (RANGE_CENTER * 2 - 1)

Definition at line 87 of file jdct.h.

RANGE_SUBSET

#define RANGE_SUBSET   (RANGE_CENTER - CENTERJSAMPLE)

Definition at line 88 of file jdct.h.

Typedef Documentation

DCTELEM

typedef INT32 DCTELEM

Definition at line 38 of file jdct.h.

FLOAT_MULT_TYPE

typedef FAST_FLOAT FLOAT_MULT_TYPE

Definition at line 74 of file jdct.h.

IFAST_MULT_TYPE

typedef INT32 IFAST_MULT_TYPE

Definition at line 71 of file jdct.h.

ISLOW_MULT_TYPE

typedef MULTIPLIER ISLOW_MULT_TYPE

Definition at line 66 of file jdct.h.

Function Documentation

EXTERN()

EXTERN

(

void

)

JMETHOD() [1/2]

typedef JMETHOD	(	void	,
		float_DCT_method_ptr	,
		(FAST_FLOAT *data, JSAMPARRAY sample_data, JDIMENSION start_col)
	)

JMETHOD() [2/2]

typedef JMETHOD	(	void	,
		forward_DCT_method_ptr	,
		(DCTELEM *data, JSAMPARRAY sample_data, JDIMENSION start_col)
	)

Variable Documentation

coef_block

jpeg_component_info JCOEFPTR coef_block

Definition at line 239 of file jdct.h.

compptr

jpeg_component_info * compptr

Definition at line 238 of file jdct.h.

Referenced by compress_data(), compress_output(), decode_mcu(), decode_mcu_DC_first(), decompress_onepass(), emit_dac(), emit_restart(), emit_sof(), emit_sos(), encode_mcu(), encode_mcu_gather(), encode_mcu_huff(), finish_pass_gather(), forward_DCT(), fullsize_downsample(), get_sof(), get_sos(), h2v1_downsample(), h2v2_downsample(), initial_setup(), int_downsample(), int_upsample(), jinit_c_coef_controller(), jinit_c_main_controller(), jinit_c_prep_controller(), jinit_d_coef_controller(), jinit_d_main_controller(), jinit_downsampler(), jinit_forward_dct(), jinit_inverse_dct(), jinit_upsampler(), jpeg_calc_output_dimensions(), jpeg_set_colorspace(), latch_quant_tables(), make_funny_pointers(), per_scan_setup(), pre_process_data(), process_restart(), sep_downsample(), sep_upsample(), set_bottom_pointers(), set_wraparound_pointers(), start_pass(), start_pass_fdctmgr(), start_pass_huff(), start_pass_huff_decoder(), write_frame_header(), and write_scan_header().

output_buf

jpeg_component_info JCOEFPTR JSAMPARRAY output_buf

Definition at line 239 of file jdct.h.

Referenced by cmyk_ycck_convert(), decompress_onepass(), gray_rgb_convert(), grayscale_convert(), null_convert(), post_process_1pass(), pre_process_data(), process_data_context_main(), process_data_simple_main(), rgb1_gray_convert(), rgb1_rgb_convert(), rgb_convert(), rgb_gray_convert(), rgb_rgb1_convert(), rgb_ycc_convert(), sep_downsample(), sep_upsample(), ycc_rgb_convert(), and ycck_cmyk_convert().

output_col

jpeg_component_info JCOEFPTR JSAMPARRAY JDIMENSION output_col

Definition at line 239 of file jdct.h.

Referenced by decompress_onepass().

sample_data

JSAMPARRAY sample_data

Definition at line 169 of file jdct.h.

Referenced by forward_DCT().

start_col

JSAMPARRAY JDIMENSION start_col

Definition at line 169 of file jdct.h.

Referenced by compress_output(), decompress_onepass(), and forward_DCT().