Method setFormat

Engine/source/gfx/bitmap/gBitmap.cpp:567–683

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//--------------------------------------------------------------------------
bool GBitmap::setFormat(GFXFormat fmt)
{
   if (getFormat() == fmt)
      return true;

   PROFILE_SCOPE(GBitmap_setFormat);

   // this is a nasty pointer math hack
   // is there a quick way to calc pixels of a fully mipped bitmap?
   U32 pixels = 0;
   for (U32 i=0; i < mNumMipLevels; i++)
      pixels += getHeight(i) * getWidth(i);

   switch( getFormat() )
   {
      case GFXFormatR8G8B8:
         switch ( fmt )
         {
            case GFXFormatR5G5B5A1:
#ifdef _XBOX
               bitmapConvertRGB_to_1555(mBits, pixels);
#else
               bitmapConvertRGB_to_5551(mBits, pixels);
#endif
               mInternalFormat = GFXFormatR5G5B5A1;
               mBytesPerPixel  = 2;
               break;

            case GFXFormatR8G8B8A8:
            case GFXFormatR8G8B8X8:
               // Took this out, it may crash -patw
               //AssertFatal( mNumMipLevels == 1, "Do the mip-mapping in hardware." );

               bitmapConvertRGB_to_RGBX( &mBits, pixels );
               mInternalFormat = fmt;
               mBytesPerPixel = 4;
               mByteSize = pixels * 4;
               break;

            default:
               AssertWarn(0, "GBitmap::setFormat: unable to convert bitmap to requested format.");
               return false;
         }
         break;

      case GFXFormatR8G8B8X8:
         switch( fmt )
         {
            // No change needed for this
            case GFXFormatR8G8B8A8:
               mInternalFormat = GFXFormatR8G8B8A8;
               break;

            case GFXFormatR8G8B8:
               bitmapConvertRGBX_to_RGB( &mBits, pixels );
               mInternalFormat = GFXFormatR8G8B8;
               mBytesPerPixel = 3;
               mByteSize = pixels * 3;