source/graphics/imageloader.cpp

   1 #include <msp/core/refptr.h>
   2 #include <msp/io/file.h>
   3 #include <msp/strings/format.h>
   4 #include <msp/strings/utils.h>
   5 #include "bmploader.h"
   6 #include "imageloader.h"
   7 #ifdef WITH_LIBPNG
   8 #include "png/pngloader.h"
   9 #endif
  10 #ifdef WITH_LIBJPEG
  11 #include "jpeg/jpegloader.h"
  12 #endif
  13 #ifdef WITH_DEVIL
  14 #include "devil/devilloader.h"
  15 #endif
  16 #ifdef WITH_QUARTZ
  17 #include "quartz/quartzloader.h"
  18 #endif
  19
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace Graphics {
  24
  25 ImageLoader::ImageLoader():
  26         source(0),
  27         state(INITIAL)
  28 { }
  29
  30 ImageLoader::~ImageLoader()
  31 {
  32         delete source;
  33 }
  34
  35 ImageLoader *ImageLoader::open_file(const string &fn)
  36 {
  37         try
  38         {
  39                 RefPtr<IO::BufferedFile> file = new IO::BufferedFile(fn);
  40                 ImageLoader *loader = open_io(*file);
  41                 loader->source = file.release();
  42                 return loader;
  43         }
  44         catch(const unsupported_image_format &e)
  45         {
  46                 throw unsupported_image_format(format("%s: %s", fn, e.what()));
  47         }
  48 }
  49
  50 ImageLoader *ImageLoader::open_io(IO::Seekable &io)
  51 {
  52         Registry &registry = get_registry();
  53         if(registry.changed)
  54         {
  55                 registry.changed = false;
  56                 registry.loaders.sort(signature_size_compare);
  57         }
  58
  59         if(registry.loaders.empty())
  60                 throw unsupported_image_format("no loaders");
  61
  62         string signature(registry.loaders.back()->get_signature_size(), 0);
  63         unsigned sig_len = io.read(&signature[0], signature.size());
  64
  65         ImageLoader *loader = 0;
  66         for(list<RegisterBase *>::const_iterator i=registry.loaders.begin(); (!loader && i!=registry.loaders.end()); ++i)
  67                 if((*i)->detect(signature))
  68                         loader = (*i)->create(io);
  69
  70         io.seek(0, IO::S_BEG);
  71
  72         if(!loader)
  73         {
  74                 string sig_hex;
  75                 for(unsigned i=0; i<sig_len; ++i)
  76                         append(sig_hex, " ", format("%02X", static_cast<unsigned char>(signature[i])));
  77                 throw unsupported_image_format(sig_hex);
  78         }
  79
  80         return loader;
  81 }
  82
  83 void ImageLoader::load(Image::Data &data)
  84 {
  85         if(state>=FINISHED)
  86                 throw logic_error("already loaded");
  87
  88         if(state<HEADERS_LOADED)
  89                 load_headers_(data);
  90         if(!data.pixels)
  91                 data.pixels = data.owned_pixels = new char[data.stride*data.height];
  92         load_pixels_(data);
  93         state = FINISHED;
  94 }
  95
  96 void ImageLoader::load_headers(Image::Data &data)
  97 {
  98         if(state>=HEADERS_LOADED)
  99                 throw logic_error("headers already loaded");
 100
 101         load_headers_(data);
 102         state = HEADERS_LOADED;
 103 }
 104
 105 ImageLoader::Registry &ImageLoader::get_registry()
 106 {
 107         static Registry registry;
 108         static bool initialized = false;
 109         if(!initialized)
 110         {
 111                 initialized = true;
 112                 register_loader<BmpLoader>();
 113 #ifdef WITH_LIBPNG
 114                 register_loader<PngLoader>();
 115 #endif
 116 #ifdef WITH_LIBJPEG
 117                 register_loader<JpegLoader>();
 118 #endif
 119 #ifdef WITH_DEVIL
 120                 register_loader<DevilLoader>();
 121 #endif
 122 #ifdef WITH_QUARTZ
 123                 register_loader<QuartzLoader>();
 124 #endif
 125         }
 126         return registry;
 127 }
 128
 129 bool ImageLoader::signature_size_compare(RegisterBase *r1, RegisterBase *r2)
 130 {
 131         return r1->get_signature_size()<r2->get_signature_size();
 132 }
 133
 134
 135 ImageLoader::Registry::Registry():
 136         changed(false)
 137 { }
 138
 139 ImageLoader::Registry::~Registry()
 140 {
 141         for(list<RegisterBase *>::iterator i=loaders.begin(); i!=loaders.end(); ++i)
 142                 delete *i;
 143 }
 144
 145 } // namespace Graphics
 146 } // namespace Msp