snes_ntsc_impl.h File Reference

#include <retro_assert.h>
#include <math.h>
#include <limits.h>

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Classes
struct	init_t
struct	pixel_info_t

Macros
#define	DISABLE_CORRECTION   0
#define	PI   3.14159265358979323846f
#define	LUMA_CUTOFF   0.20
#define	gamma_size   1
#define	rgb_bits   8
#define	artifacts_max   (artifacts_mid * 1.5f)
#define	fringing_max   (fringing_mid * 2)
#define	STD_HUE_CONDITION(setup)   1
#define	ext_decoder_hue   (std_decoder_hue + 15)
#define	rgb_unit   (1 << rgb_bits)
#define	rgb_offset   (rgb_unit * 2 + 0.5f)
#define	ROTATE_IQ(i, q, sin_b, cos_b)
#define	RGB_TO_YIQ(r, g, b, y, i)
#define	YIQ_TO_RGB(y, i, q, to_rgb, type, r, g)
#define	PACK_RGB(r, g, b)   ((r) << 21 | (g) << 11 | (b) << 1)
#define	PIXEL_OFFSET(ntsc, scaled)
#define	CORRECT_ERROR(a)   { out [a] += error; }
#define	DISTRIBUTE_ERROR(a, b, c)
#define	RGB_PALETTE_OUT(rgb, out_)
#define	restrict

Typedefs
typedef struct init_t	init_t
typedef struct pixel_info_t	pixel_info_t

Enumerations
enum	{ burst_size = snes_ntsc_entry_size / burst_count }
enum	{ kernel_half = 16 }
enum	{ kernel_size = kernel_half * 2 + 1 }
enum	{ rgb_kernel_size = burst_size / alignment_count }
enum	{ rgb_bias = rgb_unit * 2 * snes_ntsc_rgb_builder }

Functions
static void	init_filters (init_t *impl, snes_ntsc_setup_t const *setup)
static void	init (init_t *impl, snes_ntsc_setup_t const *setup)
static void	gen_kernel (init_t *impl, float y, float i, float q, snes_ntsc_rgb_t *out)
static void	correct_errors (snes_ntsc_rgb_t color, snes_ntsc_rgb_t *out)

Variables
static float const	default_decoder [6]
pixel_info_t const	snes_ntsc_pixels [alignment_count]

Macro Definition Documentation

artifacts_max

#define artifacts_max   (artifacts_mid * 1.5f)

CORRECT_ERROR

#define CORRECT_ERROR

(

a

)

{ out [a] += error; }

DISABLE_CORRECTION

#define DISABLE_CORRECTION   0

DISTRIBUTE_ERROR

#define DISTRIBUTE_ERROR	(		a,
			b,
			c
	)

Value:

{\
        snes_ntsc_rgb_t fourth = (error + 2 * snes_ntsc_rgb_builder) >> 2;\
        fourth &= (rgb_bias >> 1) - snes_ntsc_rgb_builder;\
        fourth -= rgb_bias >> 2;\
        out [a] += fourth;\
        out [b] += fourth;\
        out [c] += fourth;\
        out [i] += error - (fourth * 3);\
    }

ext_decoder_hue

#define ext_decoder_hue   (std_decoder_hue + 15)

fringing_max

#define fringing_max   (fringing_mid * 2)

gamma_size

#define gamma_size   1

LUMA_CUTOFF

#define LUMA_CUTOFF   0.20

PACK_RGB

#define PACK_RGB	(		r,
			g,
			b
	)		((r) << 21 | (g) << 11 | (b) << 1)

PI

#define PI   3.14159265358979323846f

PIXEL_OFFSET

#define PIXEL_OFFSET	(		ntsc,
			scaled
	)

Value:

(kernel_size / 2 + (ntsc) - (scaled)),\
        (1.0f - (((ntsc) + 100) & 2))

restrict

#define restrict

rgb_bits

#define rgb_bits   8

rgb_offset

#define rgb_offset   (rgb_unit * 2 + 0.5f)

RGB_PALETTE_OUT

#define RGB_PALETTE_OUT	(		rgb,
			out_
	)

Value:

{\
    unsigned char* out = (out_);\
    snes_ntsc_rgb_t clamped = (rgb);\
    SNES_NTSC_CLAMP_( clamped, (8 - rgb_bits) );\
    out [0] = (unsigned char) (clamped >> 21);\
    out [1] = (unsigned char) (clamped >> 11);\
    out [2] = (unsigned char) (clamped >>  1);\
}

RGB_TO_YIQ

#define RGB_TO_YIQ	(		r,
			g,
			b,
			y,
			i
	)

Value:

(\
    (y = (r) * 0.299f + (g) * 0.587f + (b) * 0.114f),\
    (i = (r) * 0.596f - (g) * 0.275f - (b) * 0.321f),\
    ((r) * 0.212f - (g) * 0.523f + (b) * 0.311f)\
)

rgb_unit

#define rgb_unit   (1 << rgb_bits)

ROTATE_IQ

#define ROTATE_IQ	(		i,
			q,
			sin_b,
			cos_b
	)

Value:

{\
    float t;\
    t = i * cos_b - q * sin_b;\
    q = i * sin_b + q * cos_b;\
    i = t;\
}

STD_HUE_CONDITION

#define STD_HUE_CONDITION

(

setup

)

1

YIQ_TO_RGB

#define YIQ_TO_RGB	(		y,
			i,
			q,
			to_rgb,
			type,
			r,
			g
	)

Value:

(\
    r = (type) (y + to_rgb [0] * i + to_rgb [1] * q),\
    g = (type) (y + to_rgb [2] * i + to_rgb [3] * q),\
    (type) (y + to_rgb [4] * i + to_rgb [5] * q)\
)

Typedef Documentation

init_t

typedef struct init_t init_t

pixel_info_t

typedef struct pixel_info_t pixel_info_t

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
burst_size

anonymous enum

anonymous enum

Enumerator
kernel_half

anonymous enum

anonymous enum

Enumerator
kernel_size

anonymous enum

anonymous enum

Enumerator
rgb_kernel_size

anonymous enum

anonymous enum

Enumerator
rgb_bias

Function Documentation

correct_errors()

static void correct_errors ( snes_ntsc_rgb_t  color, snes_ntsc_rgb_t *  out  )

static

gen_kernel()

static void gen_kernel ( init_t *  impl, float  y, float  i, float  q, snes_ntsc_rgb_t *  out  )

static

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init()

static void init ( init_t *  impl, snes_ntsc_setup_t const *  setup  )

static

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init_filters()

static void init_filters ( init_t *  impl, snes_ntsc_setup_t const *  setup  )

static

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Variable Documentation

default_decoder

float const default_decoder[6]

static

Initial value:

=
    { 0.956f, 0.621f, -0.272f, -0.647f, -1.105f, 1.702f }

snes_ntsc_pixels

pixel_info_t const snes_ntsc_pixels[alignment_count]