hvirtual/cinelerra/filegif.C

   1 #include "assets.h"
   2 #include "file.h"
   3 #include "filetiff.h"
   4 #include "vframe.h"
   5
   6
   7 FileGIF::FileGIF(Asset *asset) : FileBase(asset)
   8 {
   9         reset_parameters();
  10         asset->video_data = 1;
  11         asset->format = FILE_GIF;
  12 }
  13
  14 FileGIF::~FileGIF()
  15 {
  16         close_file();
  17 }
  18
  19 int FileGIF::reset_parameters_derived()
  20 {
  21         data = 0;
  22 }
  23
  24 int FileGIF::open_file(int rd, int wr)
  25 {
  26         this->rd = rd;
  27         this->wr = wr;
  28
  29 // skip header for write
  30         if(wr)
  31         {
  32         }
  33         else
  34         if(rd)
  35         {
  36                 return read_header();
  37         }
  38         return 0;
  39 }
  40
  41 int64_t FileGIF::get_video_length()
  42 {
  43         return -1;    // infinity
  44 // should be determined by whether the GIF is animated
  45 }
  46
  47 int64_t FileGIF::get_memory_usage()
  48 {
  49 // give buffer length plus padding
  50         if(data)
  51                 return asset->width * asset->height * sizeof(VPixel);
  52         else
  53                 return 256;
  54 }
  55
  56 int FileGIF::close_file_derived()
  57 {
  58         if(data) delete data;
  59         reset_parameters();
  60 }
  61
  62 int FileGIF::read_header()
  63 {
  64         GIF *stream;
  65
  66         if(!(stream = GIFOpen(asset->path, "r")))
  67         {
  68                 perror("FileGIF::read_header");
  69                 return 1;
  70         }
  71
  72         GIFGetField(stream, GIFTAG_IMAGEWIDTH, &(asset->width));
  73         GIFGetField(stream, GIFTAG_IMAGELENGTH, &(asset->height));
  74         asset->layers = 1;
  75
  76         GIFClose(stream);
  77         return 0;
  78 }
  79
  80
  81 VFrame* FileGIF::read_frame(int use_alpha, int use_float)
  82 {
  83         read_raw();
  84         return data;
  85 }
  86
  87 int FileGIF::read_raw()
  88 {
  89         if(!data)
  90         {
  91 // read the raw data
  92                 GIF *stream;
  93                 unsigned char *raw_data;
  94                 int i;
  95
  96                 if(!(stream = GIFOpen(asset->path, "r")))
  97                 {
  98                         perror("FileGIF::read_raw");
  99                         return 1;
 100                 }
 101
 102                 raw_data = new unsigned char[asset->width * asset->height * 4];
 103                 GIFReadRGBAImage(stream, asset->width, asset->height, (uint32*)raw_data, 0);
 104
 105                 GIFClose(stream);
 106
 107 // convert to a Bcast 2000 Frame
 108                 data = new VFrame(asset->width, asset->height);
 109
 110                 for(i = 0; i < asset->height; i++)
 111                 {
 112                         import_row(data->rows[asset->height - i - 1], &raw_data[i * asset->width * 4]);
 113                 }
 114
 115 // delete temporary buffers
 116                 delete raw_data;
 117         }
 118         return 0;
 119 }
 120
 121 int FileGIF::import_row(VPixel *output, unsigned char *row_pointer)
 122 {
 123         for(int i = 0, j = 0; j < asset->width; j++)
 124         {
 125 #if (VMAX == 65535)
 126                 output[j].red =  ((VWORD)row_pointer[i++]) << 8;
 127                 output[j].green =  ((VWORD)row_pointer[i++]) << 8;
 128                 output[j].blue = ((VWORD)row_pointer[i++]) << 8;
 129                 output[j].alpha = ((VWORD)row_pointer[i++]) << 8;
 130 #else
 131                 output[j].red =  (VWORD)row_pointer[i++];
 132                 output[j].green =  (VWORD)row_pointer[i++];
 133                 output[j].blue = (VWORD)row_pointer[i++];
 134                 output[j].alpha = (VWORD)row_pointer[i++];
 135 #endif
 136         }
 137 }