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.

                                         {
    8, 179, 128, 204, 253, 38, 134, 184, 68, 102, 32, 138, 99, 39, 169, 215,
    119, 26, 3, 223, 95, 239, 52, 132, 114, 74, 81, 234, 97, 116, 244, 205, 30,
    154, 173, 12, 51, 159, 122, 153, 61, 226, 236, 178, 229, 55, 181, 220, 191,
    194, 160, 126, 168, 82, 131, 18, 180, 245, 163, 22, 246, 69, 235, 252, 57,
    108, 14, 6, 152, 240, 255, 171, 242, 20, 227, 177, 238, 96, 85, 16, 211,
    70, 200, 149, 155, 146, 127, 145, 100, 151, 109, 19, 165, 208, 195, 164,
    137, 254, 182, 248, 64, 201, 45, 209, 5, 147, 207, 210, 113, 162, 83, 225,
    9, 31, 15, 231, 115, 37, 58, 53, 24, 49, 197, 56, 120, 172, 48, 21, 214,
    129, 111, 11, 50, 187, 196, 34, 60, 103, 71, 144, 47, 203, 77, 80, 232,
    140, 222, 250, 206, 166, 247, 139, 249, 221, 72, 106, 27, 199, 117, 54,
    219, 135, 118, 40, 79, 41, 251, 46, 93, 212, 92, 233, 148, 28, 121, 63,
    123, 158, 105, 59, 29, 42, 143, 23, 0, 107, 176, 87, 104, 183, 156, 193,
    189, 90, 188, 65, 190, 17, 198, 7, 186, 161, 1, 124, 78, 125, 170, 133,
    174, 218, 67, 157, 75, 101, 89, 217, 62, 33, 141, 228, 25, 35, 91, 230, 4,
    2, 13, 73, 86, 167, 237, 84, 243, 44, 185, 66, 130, 110, 150, 142, 216, 88,
    112, 36, 224, 136, 202, 76, 94, 98, 175, 213
};