Referencia del Archivo src/qt/src/3rdparty/libjpeg/jquant2.c

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

Clases
struct	my_cquantizer
struct	box
'defines'
#define	JPEG_INTERNALS
#define	R_SCALE   2
#define	G_SCALE   3
#define	B_SCALE   1
#define	C0_SCALE   R_SCALE
#define	C1_SCALE   G_SCALE
#define	C2_SCALE   B_SCALE
#define	MAXNUMCOLORS   (MAXJSAMPLE+1)
#define	HIST_C0_BITS   5
#define	HIST_C1_BITS   6
#define	HIST_C2_BITS   5
#define	HIST_C0_ELEMS   (1<<HIST_C0_BITS)
#define	HIST_C1_ELEMS   (1<<HIST_C1_BITS)
#define	HIST_C2_ELEMS   (1<<HIST_C2_BITS)
#define	C0_SHIFT   (BITS_IN_JSAMPLE-HIST_C0_BITS)
#define	C1_SHIFT   (BITS_IN_JSAMPLE-HIST_C1_BITS)
#define	C2_SHIFT   (BITS_IN_JSAMPLE-HIST_C2_BITS)
#define	BOX_C0_LOG   (HIST_C0_BITS-3)
#define	BOX_C1_LOG   (HIST_C1_BITS-3)
#define	BOX_C2_LOG   (HIST_C2_BITS-3)
#define	BOX_C0_ELEMS   (1<<BOX_C0_LOG)
#define	BOX_C1_ELEMS   (1<<BOX_C1_LOG)
#define	BOX_C2_ELEMS   (1<<BOX_C2_LOG)
#define	BOX_C0_SHIFT   (C0_SHIFT + BOX_C0_LOG)
#define	BOX_C1_SHIFT   (C1_SHIFT + BOX_C1_LOG)
#define	BOX_C2_SHIFT   (C2_SHIFT + BOX_C2_LOG)
#define	STEP_C0   ((1 << C0_SHIFT) * C0_SCALE)
#define	STEP_C1   ((1 << C1_SHIFT) * C1_SCALE)
#define	STEP_C2   ((1 << C2_SHIFT) * C2_SCALE)
#define	STEPSIZE   ((MAXJSAMPLE+1)/16)
'typedefs'
typedef UINT16	histcell
typedef histcell FAR *	histptr
typedef histcell	hist1d [HIST_C2_ELEMS]
typedef hist1d FAR *	hist2d
typedef hist2d *	hist3d
typedef INT16	FSERROR
typedef int	LOCFSERROR
typedef FSERROR FAR *	FSERRPTR
typedef my_cquantizer *	my_cquantize_ptr
typedef box *	boxptr
Funciones
	prescan_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	find_biggest_color_pop (boxptr boxlist, int numboxes)
	find_biggest_volume (boxptr boxlist, int numboxes)
	update_box (j_decompress_ptr cinfo, boxptr boxp)
	median_cut (j_decompress_ptr cinfo, boxptr boxlist, int numboxes, int desired_colors)
	compute_color (j_decompress_ptr cinfo, boxptr boxp, int icolor)
	select_colors (j_decompress_ptr cinfo, int desired_colors)
	find_nearby_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2, JSAMPLE colorlist[])
	find_best_colors (j_decompress_ptr cinfo, int minc0, int minc1, int minc2, int numcolors, JSAMPLE colorlist[], JSAMPLE bestcolor[])
	fill_inverse_cmap (j_decompress_ptr cinfo, int c0, int c1, int c2)
	pass2_no_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	pass2_fs_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows)
	init_error_limit (j_decompress_ptr cinfo)
	finish_pass1 (j_decompress_ptr cinfo)
	finish_pass2 (j_decompress_ptr cinfo)
	start_pass_2_quant (j_decompress_ptr cinfo, boolean is_pre_scan)
	new_color_map_2_quant (j_decompress_ptr cinfo)
	jinit_2pass_quantizer (j_decompress_ptr cinfo)

---

Documentación de los 'defines'

#define B_SCALE   1

#define BOX_C0_ELEMS   (1<<BOX_C0_LOG)

#define BOX_C0_LOG   (HIST_C0_BITS-3)

#define BOX_C0_SHIFT   (C0_SHIFT + BOX_C0_LOG)

#define BOX_C1_ELEMS   (1<<BOX_C1_LOG)

#define BOX_C1_LOG   (HIST_C1_BITS-3)

#define BOX_C1_SHIFT   (C1_SHIFT + BOX_C1_LOG)

#define BOX_C2_ELEMS   (1<<BOX_C2_LOG)

#define BOX_C2_LOG   (HIST_C2_BITS-3)

#define BOX_C2_SHIFT   (C2_SHIFT + BOX_C2_LOG)

#define C0_SCALE   R_SCALE

#define C0_SHIFT   (BITS_IN_JSAMPLE-HIST_C0_BITS)

#define C1_SCALE   G_SCALE

#define C1_SHIFT   (BITS_IN_JSAMPLE-HIST_C1_BITS)

#define C2_SCALE   B_SCALE

#define C2_SHIFT   (BITS_IN_JSAMPLE-HIST_C2_BITS)

#define G_SCALE   3

#define HIST_C0_BITS   5

#define HIST_C0_ELEMS   (1<<HIST_C0_BITS)

#define HIST_C1_BITS   6

#define HIST_C1_ELEMS   (1<<HIST_C1_BITS)

#define HIST_C2_BITS   5

#define HIST_C2_ELEMS   (1<<HIST_C2_BITS)

#define JPEG_INTERNALS

#define MAXNUMCOLORS   (MAXJSAMPLE+1)

#define R_SCALE   2

#define STEP_C0   ((1 << C0_SHIFT) * C0_SCALE)

#define STEP_C1   ((1 << C1_SHIFT) * C1_SCALE)

#define STEP_C2   ((1 << C2_SHIFT) * C2_SCALE)

#define STEPSIZE   ((MAXJSAMPLE+1)/16)

---

Documentación de los 'typedefs'

typedef box* boxptr

typedef INT16 FSERROR

typedef FSERROR FAR* FSERRPTR

typedef histcell hist1d[HIST_C2_ELEMS]

typedef hist1d FAR* hist2d

typedef hist2d* hist3d

typedef UINT16 histcell

typedef histcell FAR* histptr

typedef int LOCFSERROR

typedef my_cquantizer* my_cquantize_ptr

---

Documentación de las funciones

compute_color	(	j_decompress_ptr	cinfo,
		boxptr	boxp,
		int	icolor
	)

fill_inverse_cmap	(	j_decompress_ptr	cinfo,
		int	c0,
		int	c1,
		int	c2
	)

find_best_colors	(	j_decompress_ptr	cinfo,
		int	minc0,
		int	minc1,
		int	minc2,
		int	numcolors,
		JSAMPLE	colorlist[],
		JSAMPLE	bestcolor[]
	)

find_biggest_color_pop	(	boxptr	boxlist,
		int	numboxes
	)

find_biggest_volume	(	boxptr	boxlist,
		int	numboxes
	)

find_nearby_colors	(	j_decompress_ptr	cinfo,
		int	minc0,
		int	minc1,
		int	minc2,
		JSAMPLE	colorlist[]
	)

finish_pass1

(

j_decompress_ptr

cinfo

)

finish_pass2

(

j_decompress_ptr

cinfo

)

init_error_limit

(

j_decompress_ptr

cinfo

)

jinit_2pass_quantizer

(

j_decompress_ptr

cinfo

)

median_cut	(	j_decompress_ptr	cinfo,
		boxptr	boxlist,
		int	numboxes,
		int	desired_colors
	)

new_color_map_2_quant

(

j_decompress_ptr

cinfo

)

pass2_fs_dither	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows
	)

pass2_no_dither	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows
	)

prescan_quantize	(	j_decompress_ptr	cinfo,
		JSAMPARRAY	input_buf,
		JSAMPARRAY	output_buf,
		int	num_rows
	)

select_colors	(	j_decompress_ptr	cinfo,
		int	desired_colors
	)

start_pass_2_quant	(	j_decompress_ptr	cinfo,
		boolean	is_pre_scan
	)

update_box	(	j_decompress_ptr	cinfo,
		boxptr	boxp
	)