public IRenderBlock CreateUsing(FileBlockParameters parameters)
{
if (new EgaSpriteBlockSpecification().IsSatisfiedBy(parameters))
return new EgaSpriteBlock(parameters);
if (new VgaStrataBlockSpecification().IsSatisfiedBy(parameters))
return new VgaStrataBlock(parameters);
if (new VgaSpriteBlockSpecification().IsSatisfiedBy(parameters))
return new VgaSpriteBlock(parameters);
if (new VgaMixedBlockSpecification().IsSatisfiedBy(parameters))
return new VgaMixedBlock(parameters);
if (new VgaBlockSpecification().IsSatisfiedBy(parameters))
return new VgaBlock(parameters);
if (new EgaBlockSpecification().IsSatisfiedBy(parameters))
return new EgaBlock(parameters);
if (new MonoBlockSpecification().IsSatisfiedBy(parameters))
return new MonoBlock(parameters);
return new UnknownBlock();
}
public bool IsSatisfiedBy(FileBlockParameters parameters)
{
var data = parameters.Data;
if (data.Length < 20)
return false;
int height = data[0];
int width = data[1];
var widthPx = width*8;
var heightPx = height;
if (widthPx < 1 || heightPx < 1 || widthPx > 320 || heightPx > 200)
return false;
var chunkCount = data[6] + (data[7] << 8);
var chunkSize = (widthPx * heightPx);
if ((chunkCount * chunkSize) > data.Length)
return false;
int clrBase = data[8];
int clrCount = data[9];
var clrs = EgaVgaPalette.ExtractPalette(data, clrCount, clrBase, 10);
return clrs != null;
}
public bool IsSatisfiedBy(FileBlockParameters parameters)
{
var data = parameters.Data;
if (data.Length < 20)
{
return(false);
}
int height = data[0];
int width = data[1];
var widthPx = width * 8;
var heightPx = height;
if (widthPx < 1 || heightPx < 1 || widthPx > 320 || heightPx > 200)
{
return(false);
}
var chunkCount = data[6] + (data[7] << 8);
var chunkSize = (widthPx * heightPx);
if ((chunkCount * chunkSize) > data.Length)
{
return(false);
}
int clrBase = data[8];
int clrCount = data[9];
var clrs = EgaVgaPalette.ExtractPalette(data, clrCount, clrBase, 10);
return(clrs != null);
}
public IRenderBlock CreateUsing(FileBlockParameters parameters)
{
if (new EgaSpriteBlockSpecification().IsSatisfiedBy(parameters))
{
return(new EgaSpriteBlock(parameters));
}
if (new VgaStrataBlockSpecification().IsSatisfiedBy(parameters))
{
return(new VgaStrataBlock(parameters));
}
if (new VgaSpriteBlockSpecification().IsSatisfiedBy(parameters))
{
return(new VgaSpriteBlock(parameters));
}
if (new VgaMixedBlockSpecification().IsSatisfiedBy(parameters))
{
return(new VgaMixedBlock(parameters));
}
if (new VgaBlockSpecification().IsSatisfiedBy(parameters))
{
return(new VgaBlock(parameters));
}
if (new EgaBlockSpecification().IsSatisfiedBy(parameters))
{
return(new EgaBlock(parameters));
}
if (new MonoBlockSpecification().IsSatisfiedBy(parameters))
{
return(new MonoBlock(parameters));
}
return(new UnknownBlock());
}
