synfig-core/trunk/src/synfig/time.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file time.cpp
   3 **      \brief Template File
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **  Copyright (c) 2008 Gerco Ballintijn
  11 **  Copyright (c) 2008 Carlos López
  12 **
  13 **      This package is free software; you can redistribute it and/or
  14 **      modify it under the terms of the GNU General Public License as
  15 **      published by the Free Software Foundation; either version 2 of
  16 **      the License, or (at your option) any later version.
  17 **
  18 **      This package is distributed in the hope that it will be useful,
  19 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  21 **      General Public License for more details.
  22 **      \endlegal
  23 */
  24 /* ========================================================================= */
  25
  26 /* === H E A D E R S ======================================================= */
  27
  28 #ifdef USING_PCH
  29 #       include "pch.h"
  30 #else
  31 #ifdef HAVE_CONFIG_H
  32 #       include <config.h>
  33 #endif
  34
  35 #include "time.h"
  36 #include <ETL/stringf>
  37 #include <ETL/misc>
  38 #include "general.h"
  39 #include <cmath>
  40 #include <cassert>
  41 #include <algorithm>
  42 #include <cstdio>
  43 #include <ctype.h>
  44 #include <math.h>
  45
  46
  47 #ifdef WIN32
  48 #include <float.h>
  49 #ifndef isnan
  50 extern "C" { int _isnan(double x); }
  51 #define isnan _isnan
  52 #endif
  53 #endif
  54
  55 // For some reason isnan() isn't working on macosx any more.
  56 // This is a quick fix.
  57 #if defined(__APPLE__) && !defined(SYNFIG_ISNAN_FIX)
  58 #ifdef isnan
  59 #undef isnan
  60 #endif
  61 inline bool isnan(double x) { return x != x; }
  62 inline bool isnan(float x) { return x != x; }
  63 #define SYNFIG_ISNAN_FIX 1
  64 #endif
  65
  66
  67 #endif
  68
  69 /* === U S I N G =========================================================== */
  70
  71 using namespace std;
  72 using namespace etl;
  73 using namespace synfig;
  74
  75 #define tolower ::tolower
  76
  77 /* === M A C R O S ========================================================= */
  78
  79 /* === G L O B A L S ======================================================= */
  80
  81 /* === M E T H O D S ======================================================= */
  82
  83 Time::Time(const String &str_, float fps):
  84         value_(0)
  85 {
  86         String str(str_);
  87         std::transform(str.begin(),str.end(),str.begin(),&tolower);
  88
  89         // Start/Begin Of Time
  90         if(str=="sot" || str=="bot")
  91         {
  92                 operator=(begin());
  93                 return;
  94         }
  95         // End Of Time
  96         if(str=="eot")
  97         {
  98                 operator=(end());
  99                 return;
 100         }
 101
 102
 103         unsigned int pos=0;
 104         int read;
 105         float amount;
 106
 107         // Now try to read it in the letter-abbreviated format
 108         while(pos<str.size() && sscanf(String(str,pos).c_str(),"%f%n",&amount,&read))
 109         {
 110                 pos+=read;
 111                 if(pos>=str.size() || read==0)
 112                 {
 113                         // Throw up a warning if there are no units
 114                         // and the amount isn't zero. There is no need
 115                         // to warn about units if the value is zero
 116                         // it is the only case where units are irrelevant.
 117                         if(amount!=0)
 118                                 synfig::warning("Time(): No unit provided in time code, assuming SECONDS (\"%s\")",str.c_str());
 119                         value_+=amount;
 120                         return;
 121                 }
 122                 switch(str[pos])
 123                 {
 124                         case 'h':
 125                         case 'H':
 126                                 value_+=amount*3600;
 127                                 break;
 128                         case 'm':
 129                         case 'M':
 130                                 value_+=amount*60;
 131                                 break;
 132                         case 's':
 133                         case 'S':
 134                                 value_+=amount;
 135                                 break;
 136                         case 'f':
 137                         case 'F':
 138                                 if(fps)
 139                                         value_+=amount/fps;
 140                                 else
 141                                         synfig::warning("Time(): Individual frames referenced, but frame rate is unknown");
 142                                 break;
 143                         case ':':
 144                                 // try to read it in as a traditional time format
 145                                 {
 146                                         int hour,minute,second;
 147                                         float frame;
 148                                         if(fps && sscanf(str.c_str(),"%d:%d:%d.%f",&hour,&minute,&second,&frame)==4)
 149                                         {
 150                                                         value_=frame/fps+(hour*3600+minute*60+second);
 151                                                         return;
 152                                         }
 153
 154                                         if(sscanf(str.c_str(),"%d:%d:%d",&hour,&minute,&second)==3)
 155                                         {
 156                                                 value_=hour*3600+minute*60+second;
 157                                                 return;
 158                                         }
 159                                 }
 160                                 synfig::warning("Time(): Bad time format");
 161                                 break;
 162
 163                         default:
 164                                 value_+=amount;
 165                                 synfig::warning("Time(): Unexpected character '%c' when parsing time string \"%s\"",str[pos],str.c_str());
 166                                 break;
 167                 }
 168                 pos++;
 169                 amount=0;
 170         }
 171 }
 172
 173 String
 174 Time::get_string(float fps, Time::Format format)const
 175 {
 176         Time time(*this);
 177
 178         if(time<=begin())
 179                 return "SOT";   // Start Of Time
 180         if(time>=end())
 181                 return "EOT";   // End Of Time
 182
 183         if(fps<0)fps=0;
 184
 185         if(ceil(time.value_)-time.value_<epsilon_())
 186                 time.value_=ceil(time.value_);
 187
 188         int hour = 0, minute = 0;
 189         if(!(format<=FORMAT_FRAMES))
 190         {
 191                 hour=time/3600;time-=hour*3600;
 192                 minute=time/60;time-=minute*60;
 193         }
 194         // <= is redefined, so this means "is the FORMAT_VIDEO bit set in the format?"
 195         if(format<=FORMAT_VIDEO)
 196         {
 197                 int second;
 198                 second=time;time-=second;
 199
 200                 if(fps && fps>1)
 201                 {
 202                         int frame;
 203                         frame=round_to_int(time*fps);
 204
 205                         return strprintf("%02d:%02d:%02d.%02d",hour,minute,second,frame);
 206                 }
 207                 else
 208                         return strprintf("%02d:%02d:%02d",hour,minute,second);
 209         }
 210
 211         if (format <= FORMAT_FRAMES)
 212         {
 213                 if (fps && fps>0)
 214                         return strprintf("%df", round_to_int(time * fps));
 215                 else
 216                         return strprintf("%ds", round_to_int(time * 1));
 217         }
 218
 219         String ret;
 220         bool started = false;
 221
 222         if(format<=FORMAT_FULL || hour)
 223         {
 224                 ret+=strprintf("%dh",hour);
 225                 started = true;
 226         }
 227
 228         if(format<=FORMAT_FULL || minute)
 229         {
 230                 if (!(format<=FORMAT_NOSPACES) && started)
 231                         ret += " ";
 232
 233                 ret += strprintf("%dm", minute);
 234                 started = true;
 235         }
 236
 237         if(fps && fps>1)
 238         {
 239                 int second;
 240                 float frame;
 241                 second=time;time-=second;
 242                 frame=time*fps;
 243
 244                 if(format<=FORMAT_FULL || second)
 245                 {
 246                         if (!(format<=FORMAT_NOSPACES) && started)
 247                                 ret += " ";
 248
 249                         ret += strprintf("%ds", (int)second);
 250                         started = true;
 251                 }
 252
 253                 if(format<=FORMAT_FULL || abs(frame) > epsilon_() || !started)
 254                 {
 255                         if (!(format<=FORMAT_NOSPACES) && started)
 256                                 ret += " ";
 257
 258                         if(abs(frame-floor(frame) >= epsilon_()))
 259                                 ret += strprintf("%0.3ff", frame);
 260                         else
 261                                 ret += strprintf("%0.0ff", frame);
 262                 }
 263         }
 264         else
 265         {
 266                 float second;
 267                 second=time;
 268                 if(format<=FORMAT_FULL || second || !started)
 269                 {
 270                         if (!(format<=FORMAT_NOSPACES) && started)
 271                                 ret += " ";
 272
 273                         if(abs(second-floor(second))>=epsilon_())
 274                         {
 275                                 String seconds(strprintf("%0.8f",second));
 276
 277                                 // skip trailing zeros
 278                                 int count = 0;
 279                                 String::reverse_iterator i = seconds.rbegin();
 280                                 for ( ; (*i) == '0'; i++)
 281                                         count++;
 282
 283                                 // if we removed too many, go back one place, leaving one zero
 284                                 if (*i < '0' || *i > '9') count--;
 285
 286                                 ret += seconds.substr(0, seconds.size()-count) + "s";
 287                         }
 288                         else
 289                                 ret+=strprintf("%0.0fs",second);
 290                 }
 291         }
 292
 293         return ret;
 294 }
 295
 296 Time
 297 Time::round(float fps)const
 298 {
 299         assert(fps>0);
 300
 301         value_type time(*this);
 302
 303         time*=fps;
 304
 305         if(abs(time-floor(time))<0.5)
 306                 return floor(time)/fps;
 307         else
 308                 return ceil(time)/fps;
 309 }
 310
 311 #ifdef _DEBUG
 312 const char *
 313 Time::c_str()const
 314 {
 315         return get_string().c_str();
 316 }
 317 #endif
 318
 319 //! \writeme
 320 bool
 321 Time::is_valid()const
 322 {
 323         return !isnan(value_);
 324 }