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ImageFormat.cpp

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//*** ImageFormat.cpp ***

#include "ImageFormat.h"
#include "Debug.h"
#include "Asset.h"
#include "StandardLibrary.h"

Array<ImageFormat::ImageFormatEntry> ImageFormat::imageFormats_;

//*** RegisterImageFormat ***

void ImageFormat::RegisterImageFormat(bool (*TestFunction)(const Asset&),ImageFormat* (*CreateFunction)(const Asset&))
   {
   ImageFormatEntry entry;
   entry.TestFunction=TestFunction;
   entry.CreateFunction=CreateFunction;
   imageFormats_.Add(entry);
   }


//*** CreateImageFormat ***

ImageFormat* ImageFormat::CreateImageFormat(const Asset& asset)
   {
   // Make sure asset exists
   #ifdef _DEBUG
   if (!asset.Open())
      {
      const char* filename=asset.GetFilename().GetString();
      if (filename)
         {
         char errorMessage[1024];
         SNPrintF(errorMessage,1024,"File not found: %s",filename);
         Assert(false,errorMessage);
         }
      else
         {
         Assert(false,"An asset could not be accessed.");
         }

      return 0;
      }
   asset.Close();
   #endif

   for (int i=0; i<imageFormats_.GetItemCount(); i++)
      {
      ImageFormatEntry entry=imageFormats_.Get(i);
      if (entry.TestFunction(asset))
         {
         return entry.CreateFunction(asset);
         }
      }

   // Report unknown image format
   #ifdef _DEBUG
   const char* filename=asset.GetFilename().GetString();
   if (filename)
      {
      char errorMessage[1024];
      SNPrintF(errorMessage,1024,"Unknown image format: %s",filename);
      Assert(false,errorMessage);
      }
   else
      {
      Assert(false,"Unknown image format.");
      }
   #endif

   return 0;
   }

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