// Draw the background and return it as blitimage.
public BlitImage RenderBackground(int index)
{
if (index >= 0 && index < Backgrounds.Count)
{
BackgroundTiles tiles = ((Background)Backgrounds [index]).MyBackgroundTiles;
if (tiles != null)
{
byte [] b = tiles.Render(ActiveTileSet);
return(new BlitImage(b, 256));
}
}
var image = new BlitImage(256, 256);
image.Black();
return(image);
}
// Read data from ROM at given PC address.
public override bool ReadFromROM(Rom rom, int addressPC)
{
int TilesPtr = 0;
byte [] b = new byte [11];
rom.Seek(addressPC);
if (!rom.Read(b, 0, 2))
{
return(false);
}
int blockSize;
int totalSize = 0;
while (b [0] != 0 || b [1] != 0)
{
int type = Tools.ConcatBytes(b [0], b [1]);
// Bytes.Add (b [0]);
// Bytes.Add (b [1]);
switch (type)
{
default:
Console.WriteLine("Unknown BG block type found: {0}", Tools.IntToHex(type));
return(false);
case 0x000A:
case 0x000C:
blockSize = 2;
break;
case 0x0004:
blockSize = 7;
break;
case 0x0002:
case 0x0008:
blockSize = 9;
break;
case 0x000E:
blockSize = 11;
break;
}
if (!rom.Read(b, 2, blockSize - 2))
{
return(false);
}
for (int i = 0; i < blockSize; i++)
{
Bytes.Add(b [i]);
}
if (type == 0x0004)
{
if (TilesPtr == 0)
{
TilesPtr = Tools.ConcatBytes(b [2], b [3], b [4]);
}
else
{
TilesPtr = 0; // [wip] still an ugly hack to skip Kraid background
}
}
totalSize += blockSize;
if (!rom.Read(b, 0, 2))
{
return(false);
}
}
if (TilesPtr != 0)
{
MyBackgroundTiles = new BackgroundTiles();
MyBackgroundTiles.ReadFromROM(rom, Tools.LRtoPC(TilesPtr));
}
startAddressPC = addressPC;
return(true);
}
