/// <summary>
/// Reads backgrounds from GM file.
/// </summary>
private GMList<GMBackground> ReadBackgrounds()
{
// Get version.
int version = ReadInt();
// Check version.
if (version != 400 && version != 800)
throw new Exception("Unsupported Pre-Background object version.");
// Create a new list of backgrounds.
GMList<GMBackground> backgrounds = new GMList<GMBackground>();
// Amount of background ids.
int num = ReadInt();
// Iterate through backgrounds.
for (int i = 0; i < num; i++)
{
// If version is 8.0, start inflate.
if (version == 800)
Decompress();
// If the background at index does not exists, continue.
if (ReadBool() == false)
{
backgrounds.LastId++;
EndDecompress();
continue;
}
// Create a new background object.
GMBackground background = new GMBackground();
// Set background id
background.Id = i;
// Get background data.
background.Name = ReadString();
// If version is 8.0, get last changed.
if (version == 800)
background.LastChanged = ReadDouble();
// Get version.
version = ReadInt();
// Check version.
if (version != 400 && version != 543 && version != 710)
throw new Exception("Unsupported Background object version.");
// If version is less than 7.1.
if (version < 710)
{
// Background data
background.Width = ReadInt();
background.Height = ReadInt();
background.Transparent = ReadBool();
// Check version.
if (version > 400)
{
// Read background data.
background.SmoothEdges = ReadBool();
background.Preload = ReadBool();
background.UseAsTileSet = ReadBool();
background.TileWidth = ReadInt();
background.TileHeight = ReadInt();
background.HorizontalOffset = ReadInt();
background.VerticalOffset = ReadInt();
background.HorizontalSeperation = ReadInt();
background.VerticalSeperation = ReadInt();
}
else
{
// Read background data.
background.UseVideoMemory = ReadBool();
background.LoadOnlyOnUse = ReadBool();
}
// If image data exists.
if (ReadBool())
{
// If pixel data does not exist.
if (ReadInt() == -1)
continue;
// Create a new image.
GMImage image = new GMImage();
// Get size of image data.
int size = ReadInt();
// Get compressed image data.
image.Data = ReadBytes(size);
// Set background image.
background.Image = image;
}
}
else
{
// Get background data.
background.UseAsTileSet = ReadBool();
background.TileWidth = ReadInt();
background.TileHeight = ReadInt();
background.HorizontalOffset = ReadInt();
background.VerticalOffset = ReadInt();
background.HorizontalSeperation = ReadInt();
background.VerticalSeperation = ReadInt();
// Get version.
version = ReadInt();
// Check version.
if (version != 800)
throw new Exception("Unsupported Background object version.");
// Get image data.
background.Width = ReadInt();
background.Height = ReadInt();
// If the sprite size is not zero.
if (background.Width != 0 && background.Height != 0)
{
// Create a new image object.
GMImage image = new GMImage();
image.Compressed = false;
// Set image data.
image.Width = background.Width;
image.Height = background.Height;
// Get size of image data.
int size = ReadInt();
// Get image data.
image.Data = ReadBytes(size);
// Insert compressed image data.
background.Image = image;
}
}
// End object inflate.
EndDecompress();
// Add background.
backgrounds.Add(background);
}
// Return backgrounds.
return backgrounds;
}
