libass/ass_utils.h

   1 /*
   2  * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
   3  *
   4  * This file is part of libass.
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #ifndef LIBASS_UTILS_H
  20 #define LIBASS_UTILS_H
  21
  22 #include <stdio.h>
  23 #include <stdarg.h>
  24 #include <stdint.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <assert.h>
  28
  29 #ifdef CONFIG_ENCA
  30 #include <enca.h>
  31 #endif
  32
  33 #include "ass.h"
  34
  35 #define MSGL_FATAL 0
  36 #define MSGL_ERR 1
  37 #define MSGL_WARN 2
  38 #define MSGL_INFO 4
  39 #define MSGL_V 6
  40 #define MSGL_DBG2 7
  41
  42 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
  43 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
  44 #define FFMINMAX(c,a,b) FFMIN(FFMAX(c, a), b)
  45
  46 int mystrtoi(char **p, int *res);
  47 int mystrtoll(char **p, long long *res);
  48 int mystrtou32(char **p, int base, uint32_t *res);
  49 int mystrtod(char **p, double *res);
  50 int strtocolor(ASS_Library *library, char **q, uint32_t *res, int hex);
  51 char parse_bool(char *str);
  52 unsigned ass_utf8_get_char(char **str);
  53 void ass_msg(ASS_Library *priv, int lvl, char *fmt, ...);
  54 #ifdef CONFIG_ENCA
  55 void *ass_guess_buffer_cp(ASS_Library *library, unsigned char *buffer,
  56                           int buflen, char *preferred_language,
  57                           char *fallback);
  58 #endif
  59
  60 /* defined in ass_strtod.c */
  61 double ass_strtod(const char *string, char **endPtr);
  62
  63 static inline int d6_to_int(int x)
  64 {
  65     return (x + 32) >> 6;
  66 }
  67 static inline int d16_to_int(int x)
  68 {
  69     return (x + 32768) >> 16;
  70 }
  71 static inline int int_to_d6(int x)
  72 {
  73     return x << 6;
  74 }
  75 static inline int int_to_d16(int x)
  76 {
  77     return x << 16;
  78 }
  79 static inline int d16_to_d6(int x)
  80 {
  81     return (x + 512) >> 10;
  82 }
  83 static inline int d6_to_d16(int x)
  84 {
  85     return x << 10;
  86 }
  87 static inline double d6_to_double(int x)
  88 {
  89     return x / 64.;
  90 }
  91 static inline int double_to_d6(double x)
  92 {
  93     return (int) (x * 64);
  94 }
  95 static inline double d16_to_double(int x)
  96 {
  97     return ((double) x) / 0x10000;
  98 }
  99 static inline int double_to_d16(double x)
 100 {
 101     return (int) (x * 0x10000);
 102 }
 103 static inline double d22_to_double(int x)
 104 {
 105     return ((double) x) / 0x400000;
 106 }
 107 static inline int double_to_d22(double x)
 108 {
 109     return (int) (x * 0x400000);
 110 }
 111
 112 // Calculate cache key for a rotational angle in degrees
 113 static inline int rot_key(double a)
 114 {
 115     const int m = double_to_d22(360.0);
 116     return double_to_d22(a) % m;
 117 }
 118
 119 #define FNV1_32A_INIT (unsigned)0x811c9dc5
 120
 121 static inline unsigned fnv_32a_buf(void *buf, size_t len, unsigned hval)
 122 {
 123     unsigned char *bp = buf;
 124     unsigned char *be = bp + len;
 125     while (bp < be) {
 126         hval ^= (unsigned) *bp++;
 127         hval +=
 128             (hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) +
 129             (hval << 24);
 130     }
 131     return hval;
 132 }
 133 static inline unsigned fnv_32a_str(char *str, unsigned hval)
 134 {
 135     unsigned char *s = (unsigned char *) str;
 136     while (*s) {
 137         hval ^= (unsigned) *s++;
 138         hval +=
 139             (hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) +
 140             (hval << 24);
 141     }
 142     return hval;
 143 }
 144
 145 #endif                          /* LIBASS_UTILS_H */