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  * libass is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * libass is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with libass; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #ifndef LIBASS_UTILS_H
  22 #define LIBASS_UTILS_H
  23
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include <stdint.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <assert.h>
  30
  31 #ifdef CONFIG_ENCA
  32 #include <enca.h>
  33 #endif
  34
  35 #include "ass.h"
  36
  37 #define MSGL_FATAL 0
  38 #define MSGL_ERR 1
  39 #define MSGL_WARN 2
  40 #define MSGL_INFO 4
  41 #define MSGL_V 6
  42 #define MSGL_DBG2 7
  43
  44 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
  45 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
  46 #define FFMINMAX(c,a,b) FFMIN(FFMAX(c, a), b)
  47
  48 int mystrtoi(char **p, int *res);
  49 int mystrtoll(char **p, long long *res);
  50 int mystrtou32(char **p, int base, uint32_t *res);
  51 int mystrtod(char **p, double *res);
  52 int strtocolor(ASS_Library *library, char **q, uint32_t *res, int hex);
  53 char parse_bool(char *str);
  54 unsigned ass_utf8_get_char(char **str);
  55 void ass_msg(ASS_Library *priv, int lvl, char *fmt, ...);
  56 #ifdef CONFIG_ENCA
  57 void *ass_guess_buffer_cp(ASS_Library *library, unsigned char *buffer,
  58                           int buflen, char *preferred_language,
  59                           char *fallback);
  60 #endif
  61
  62 /* defined in ass_strtod.c */
  63 double ass_strtod(const char *string, char **endPtr);
  64
  65 static inline int d6_to_int(int x)
  66 {
  67     return (x + 32) >> 6;
  68 }
  69 static inline int d16_to_int(int x)
  70 {
  71     return (x + 32768) >> 16;
  72 }
  73 static inline int int_to_d6(int x)
  74 {
  75     return x << 6;
  76 }
  77 static inline int int_to_d16(int x)
  78 {
  79     return x << 16;
  80 }
  81 static inline int d16_to_d6(int x)
  82 {
  83     return (x + 512) >> 10;
  84 }
  85 static inline int d6_to_d16(int x)
  86 {
  87     return x << 10;
  88 }
  89 static inline double d6_to_double(int x)
  90 {
  91     return x / 64.;
  92 }
  93 static inline int double_to_d6(double x)
  94 {
  95     return (int) (x * 64);
  96 }
  97 static inline double d16_to_double(int x)
  98 {
  99     return ((double) x) / 0x10000;
 100 }
 101 static inline int double_to_d16(double x)
 102 {
 103     return (int) (x * 0x10000);
 104 }
 105 static inline double d22_to_double(int x)
 106 {
 107     return ((double) x) / 0x400000;
 108 }
 109 static inline int double_to_d22(double x)
 110 {
 111     return (int) (x * 0x400000);
 112 }
 113
 114 // Calculate cache key for a rotational angle in degrees
 115 static inline int rot_key(double a)
 116 {
 117     const int m = double_to_d22(360.0);
 118     return double_to_d22(a) % m;
 119 }
 120
 121 #define FNV1_32A_INIT (unsigned)0x811c9dc5
 122
 123 static inline unsigned fnv_32a_buf(void *buf, size_t len, unsigned hval)
 124 {
 125     unsigned char *bp = buf;
 126     unsigned char *be = bp + len;
 127     while (bp < be) {
 128         hval ^= (unsigned) *bp++;
 129         hval +=
 130             (hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) +
 131             (hval << 24);
 132     }
 133     return hval;
 134 }
 135 static inline unsigned fnv_32a_str(char *str, unsigned hval)
 136 {
 137     unsigned char *s = (unsigned char *) str;
 138     while (*s) {
 139         hval ^= (unsigned) *s++;
 140         hval +=
 141             (hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) +
 142             (hval << 24);
 143     }
 144     return hval;
 145 }
 146
 147 #endif                          /* LIBASS_UTILS_H */