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