1/*
2 * Copyright 2018 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#pragma once
9
10// skcms_internal.h contains APIs shared by skcms' internals and its test tools.
11// Please don't use this header from outside the skcms repo.
12
13#include "skcms.h"
14#include <stdbool.h>
15#include <stdint.h>
16
17#ifdef __cplusplus
18extern "C" {
19#endif
20
21// ~~~~ General Helper Macros ~~~~
22 #define ARRAY_COUNT(arr) (int)(sizeof((arr)) / sizeof(*(arr)))
23
24 typedef struct skcms_ICCTag {
25 uint32_t signature;
26 uint32_t type;
27 uint32_t size;
28 const uint8_t* buf;
29 } skcms_ICCTag;
30
31 void skcms_GetTagByIndex (const skcms_ICCProfile*, uint32_t idx, skcms_ICCTag*);
32 bool skcms_GetTagBySignature(const skcms_ICCProfile*, uint32_t sig, skcms_ICCTag*);
33
34 float skcms_MaxRoundtripError(const skcms_Curve* curve, const skcms_TransferFunction* inv_tf);
35
36 // 252 of a random shuffle of all possible bytes.
37 // 252 is evenly divisible by 3 and 4. Only 192, 10, 241, and 43 are missing.
38 // Used for ICC profile equivalence testing.
39 extern const uint8_t skcms_252_random_bytes[252];
40
41// ~~~~ Portable Math ~~~~
42 static inline float floorf_(float x) {
43 float roundtrip = (float)((int)x);
44 return roundtrip > x ? roundtrip - 1 : roundtrip;
45 }
46 static inline float fabsf_(float x) { return x < 0 ? -x : x; }
47 float powf_(float, float);
48
49// ~~~~ Does this pixel format need a palette pointer to be usable? ~~~~
50 static inline bool needs_palette(skcms_PixelFormat fmt) {
51 return (fmt >> 1) == (skcms_PixelFormat_RGBA_8888_Palette8 >> 1);
52 }
53
54#ifdef __cplusplus
55}
56#endif
57