skcms_internals.h File Reference

#include <stdbool.h>
#include <stdint.h>

Go to the source code of this file.

Classes
struct	skcms_ICCTag

Macros
#define	ARRAY_COUNT(arr)   (int)(sizeof((arr)) / sizeof(*(arr)))
#define	SKCMS_FALLTHROUGH
#define	SKCMS_HAS_MUSTTAIL   0
#define	SKCMS_MAYBE_UNUSED
#define	SAFE_SIZEOF(x)   ((uint64_t)sizeof(x))
#define	SAFE_FIXED_SIZE(type)   ((uint64_t)offsetof(type, variable))
#define	SKCMS_PORTABLE   1
#define	SKCMS_DISABLE_HSW   1
#define	SKCMS_DISABLE_SKX   1

Typedefs
typedef struct skcms_ICCTag	skcms_ICCTag
typedef struct skcms_ICCProfile	skcms_ICCProfile
typedef struct skcms_TransferFunction	skcms_TransferFunction
typedef union skcms_Curve	skcms_Curve

Functions
void	skcms_GetTagByIndex (const skcms_ICCProfile *, uint32_t idx, skcms_ICCTag *)
bool	skcms_GetTagBySignature (const skcms_ICCProfile *, uint32_t sig, skcms_ICCTag *)
float	skcms_MaxRoundtripError (const skcms_Curve *curve, const skcms_TransferFunction *inv_tf)
static float	floorf_ (float x)
static float	fabsf_ (float x)
float	powf_ (float, float)

Variables
const uint8_t	skcms_252_random_bytes [252]

Macro Definition Documentation

ARRAY_COUNT

#define ARRAY_COUNT

(

arr

)

(int)(sizeof((arr)) / sizeof(*(arr)))

Definition at line 22 of file skcms_internals.h.

SAFE_FIXED_SIZE

#define SAFE_FIXED_SIZE

(

type

)

((uint64_t)offsetof(type, variable))

Definition at line 83 of file skcms_internals.h.

SAFE_SIZEOF

#define SAFE_SIZEOF

(

x

)

((uint64_t)sizeof(x))

Definition at line 80 of file skcms_internals.h.

SKCMS_DISABLE_HSW

#define SKCMS_DISABLE_HSW   1

Definition at line 97 of file skcms_internals.h.

SKCMS_DISABLE_SKX

#define SKCMS_DISABLE_SKX   1

Definition at line 102 of file skcms_internals.h.

SKCMS_FALLTHROUGH

#define SKCMS_FALLTHROUGH

Definition at line 58 of file skcms_internals.h.

SKCMS_HAS_MUSTTAIL

#define SKCMS_HAS_MUSTTAIL   0

Definition at line 61 of file skcms_internals.h.

SKCMS_MAYBE_UNUSED

#define SKCMS_MAYBE_UNUSED

Definition at line 72 of file skcms_internals.h.

SKCMS_PORTABLE

#define SKCMS_PORTABLE   1

Definition at line 89 of file skcms_internals.h.

Typedef Documentation

skcms_Curve

typedef union skcms_Curve skcms_Curve

Definition at line 116 of file skcms_internals.h.

skcms_ICCProfile

typedef struct skcms_ICCProfile skcms_ICCProfile

Definition at line 114 of file skcms_internals.h.

skcms_ICCTag

typedef struct skcms_ICCTag skcms_ICCTag

skcms_TransferFunction

typedef struct skcms_TransferFunction skcms_TransferFunction

Definition at line 115 of file skcms_internals.h.

Function Documentation

fabsf_()

static float fabsf_ ( float  x )

inlinestatic

Definition at line 133 of file skcms_internals.h.

{ return x < 0 ? -x : x; }

floorf_()

static float floorf_ ( float  x )

inlinestatic

Definition at line 129 of file skcms_internals.h.

                                     {
    float roundtrip = (float)((int)x);
    return roundtrip > x ? roundtrip - 1 : roundtrip;
}

powf_()

float powf_	(	float	x,
		float	y
	)

Definition at line 93 of file skcms.cc.

                              {
    if (x <= 0.f) {
        return 0.f;
    }
    if (x == 1.f) {
        return 1.f;
    }
    return exp2f_(log2f_(x) * y);
}

skcms_GetTagByIndex()

void skcms_GetTagByIndex	(	const skcms_ICCProfile *	profile,
		uint32_t	idx,
		skcms_ICCTag *	tag
	)

Definition at line 1211 of file skcms.cc.

                                                                                           {
    if (!profile || !profile->buffer || !tag) { return; }
    if (idx > profile->tag_count) { return; }
    const tag_Layout* tags = get_tag_table(profile);
    tag->signature = read_big_u32(tags[idx].signature);
    tag->size      = read_big_u32(tags[idx].size);
    tag->buf       = read_big_u32(tags[idx].offset) + profile->buffer;
    tag->type      = read_big_u32(tag->buf);
}

skcms_GetTagBySignature()

bool skcms_GetTagBySignature	(	const skcms_ICCProfile *	profile,
		uint32_t	sig,
		skcms_ICCTag *	tag
	)

Definition at line 1221 of file skcms.cc.

                                                                                               {
    if (!profile || !profile->buffer || !tag) { return false; }
    const tag_Layout* tags = get_tag_table(profile);
    for (uint32_t i = 0; i < profile->tag_count; ++i) {
        if (read_big_u32(tags[i].signature) == sig) {
            tag->signature = sig;
            tag->size      = read_big_u32(tags[i].size);
            tag->buf       = read_big_u32(tags[i].offset) + profile->buffer;
            tag->type      = read_big_u32(tag->buf);
            return true;
        }
    }
    return false;
}

skcms_MaxRoundtripError()

float skcms_MaxRoundtripError	(	const skcms_Curve *	curve,
		const skcms_TransferFunction *	inv_tf
	)

Definition at line 273 of file skcms.cc.

                                                                                              {
    uint32_t N = curve->table_entries > 256 ? curve->table_entries : 256;
    const float dx = 1.0f / static_cast<float>(N - 1);
    float err = 0;
    for (uint32_t i = 0; i < N; i++) {
        float x = static_cast<float>(i) * dx,
              y = eval_curve(curve, x);
        err = fmaxf_(err, fabsf_(x - skcms_TransferFunction_eval(inv_tf, y)));
    }
    return err;
}

Variable Documentation

skcms_252_random_bytes

const uint8_t skcms_252_random_bytes[252]

extern

Definition at line 1602 of file skcms.cc.