Use lambdas for comparison functions

[libs/gui.git] / source / graphics / imageloader.cpp

diff --git a/source/graphics/imageloader.cpp b/source/graphics/imageloader.cpp
index 6cdaef912e65062740c284559b3851c742bd102b..55d2dfb1b8f8c3f4cab2ebd3c9bcd93a0a0e547e 100644 (file)
--- a/source/graphics/imageloader.cpp
+++ b/source/graphics/imageloader.cpp
@@ -1,28 +1,42 @@
+#include "imageloader.h"
+#include <msp/core/algorithm.h>
 #include <msp/core/refptr.h>
 #include <msp/io/file.h>
 #include <msp/strings/format.h>
-#include "imageloader.h"
+#include <msp/strings/utils.h>
+#include "bmploader.h"
 #ifdef WITH_LIBPNG
 #include "png/pngloader.h"
 #endif
+#ifdef WITH_LIBJPEG
+#include "jpeg/jpegloader.h"
+#endif
 #ifdef WITH_DEVIL
 #include "devil/devilloader.h"
 #endif
+#ifdef WITH_QUARTZ
+#include "quartz/quartzloader.h"
+#endif
 
 using namespace std;
 
 namespace Msp {
 namespace Graphics {
 
-ImageLoader::ImageLoader():
-       source(0)
-{ }
-
 ImageLoader::~ImageLoader()
 {
        delete source;
 }
 
+bool ImageLoader::detect_signature(const string &sig)
+{
+       Registry &registry = get_registry();
+       for(const RegisterBase *r: registry.loaders)
+               if(r->detect(sig))
+                       return true;
+       return false;
+}
+
 ImageLoader *ImageLoader::open_file(const string &fn)
 {
        try
@@ -40,37 +54,91 @@ ImageLoader *ImageLoader::open_file(const string &fn)
 
 ImageLoader *ImageLoader::open_io(IO::Seekable &io)
 {
-       char sig_buf[8];
-       unsigned sig_len = io.read(sig_buf, sizeof(sig_buf));
-       string sig(sig_buf, sig_len);
+       Registry &registry = get_registry();
+       if(registry.changed)
+       {
+               registry.changed = false;
+               sort(registry.loaders,  [](RegisterBase *r1, RegisterBase *r2){
+                       return r1->get_signature_size()<r2->get_signature_size();
+               });
+       }
+
+       if(registry.loaders.empty())
+               throw unsupported_image_format("no loaders");
+
+       string signature(registry.loaders.back()->get_signature_size(), 0);
+       unsigned sig_len = io.read(&signature[0], signature.size());
+
+       ImageLoader *loader = nullptr;
+       for(auto i=registry.loaders.begin(); (!loader && i!=registry.loaders.end()); ++i)
+               if((*i)->detect(signature))
+                       loader = (*i)->create(io);
+
        io.seek(0, IO::S_BEG);
 
-       // TODO register loader classes automatically
-       ImageLoader *loader = 0;
-       if(0)
-               ;
-#ifdef WITH_LIBPNG
-       else if(PngLoader::detect(sig))
-               loader = new PngLoader(io);
-#endif
-#ifdef WITH_DEVIL
-       else if(DevilLoader::detect(sig))
-               loader = new DevilLoader(io);
-#endif
-       else
+       if(!loader)
        {
                string sig_hex;
                for(unsigned i=0; i<sig_len; ++i)
-               {
-                       if(i)
-                               sig_hex += ' ';
-                       sig_hex += format("%02X", static_cast<unsigned char>(sig_buf[i]));
-               }
+                       append(sig_hex, " ", format("%02X", static_cast<unsigned char>(signature[i])));
                throw unsupported_image_format(sig_hex);
        }
 
        return loader;
 }
 
+void ImageLoader::load(Image::Data &data)
+{
+       if(state>=FINISHED)
+               throw logic_error("already loaded");
+
+       if(state<HEADERS_LOADED)
+               load_headers_(data);
+       if(!data.pixels)
+               data.pixels = data.owned_pixels = new char[data.stride*data.height];
+       load_pixels_(data);
+       state = FINISHED;
+}
+
+void ImageLoader::load_headers(Image::Data &data)
+{
+       if(state>=HEADERS_LOADED)
+               throw logic_error("headers already loaded");
+
+       load_headers_(data);
+       state = HEADERS_LOADED;
+}
+
+ImageLoader::Registry &ImageLoader::get_registry()
+{
+       static Registry registry;
+       static bool initialized = false;
+       if(!initialized)
+       {
+               initialized = true;
+               register_loader<BmpLoader>();
+#ifdef WITH_LIBPNG
+               register_loader<PngLoader>();
+#endif
+#ifdef WITH_LIBJPEG
+               register_loader<JpegLoader>();
+#endif
+#ifdef WITH_DEVIL
+               register_loader<DevilLoader>();
+#endif
+#ifdef WITH_QUARTZ
+               register_loader<QuartzLoader>();
+#endif
+       }
+       return registry;
+}
+
+
+ImageLoader::Registry::~Registry()
+{
+       for(auto l: loaders)
+               delete l;
+}
+
 } // namespace Graphics
 } // namespace Msp