protected override bool Insert(IntSize size, out IntRectangle rect)
{
// Find first acceptable insertion
for (var i = 0; i < Strips.Count; i++)
{
// Try to fit compact
if (CheckFit(i, in size))
{
// Anchor image to
rect = new IntRectangle(Strips[i].Position, size);
InsertStrip(new Strip(rect.X, rect.Y + size.Height, size.Width));
return(true);
}
}
// No acceptable insertion, try to place on "shelf"
if (CheckFitShelf(size, out var shelf))
{
rect = new IntRectangle((0, shelf), size);
InsertStrip(new Strip(0, shelf + size.Height, size.Width));
return(true);
}
// Unable to find a place to insert
rect = default;
return(false);
}
internal Surface(IntSize size, MultisampleQuality multisample, SurfaceType surfaceType, bool isScreenBound)
{
if (size.Width <= 0 || size.Height <= 0)
{
throw new ArgumentException("Surface dimensions must be greater than zero.");
}
Size = size;
IsScreenBound = isScreenBound;
SurfaceType = surfaceType;
// Keep highest supported MSAA level.
Multisample = Calc.Min(multisample, GraphicsAdapter.SurfaceFactory.MaxSupportedMultisampleQuality);
if (Multisample != multisample)
{
Log.Warning($"Requested MSAA level '{multisample}' was not supported on this device.");
}
if (!IsScreenBound)
{
// Surface is an offscreen render target
Native = GraphicsAdapter.SurfaceFactory.Create(this);
Multisample = multisample;
}
else
{
if (SurfaceType != SurfaceType.UnsignedByte)
{
throw new ArgumentException($"Screen bound surfaces must be have type '{nameof(SurfaceType.UnsignedByte)}'.");
}
}
}
/// <summary>
/// Constructs a new blank image of the specified size.
/// </summary>
/// <param name="width">The width of the image in pixels.</param>
/// <param name="height">The height of the image in pixels.</param>
/// <exception cref="ArgumentException">Thrown when any dimension is negative or exceeds <see cref="MaxImageDimension"/>.</exception>
public Image(int width, int height)
{
ValidateImageSize(in width, in height);
// Allocate pixels
Pixels = new ColorBytes[width * height];
_size = new IntSize(width, height);
}
public SkylinePacker(IntSize size)
: base(size)
{
Strips = new List <Strip>();
// Start clean
Clear();
}
static bool minimizeArea(IntRectangle a, IntRectangle b, IntSize item)
{
var x0 = a.Width - item.Width;
var y0 = a.Height - item.Height;
var x1 = b.Width - item.Width;
var y1 = b.Height - item.Height;
return((x0 + y0) <= (x1 + y1));
}
private static Queue <Surface> GetPool(IntSize size, MultisampleQuality multisample)
{
var key = (multisample, size);
if (_pools.TryGetValue(key, out var pool))
{
// Return already known pool
return(pool);
}
else
{
// Construct pool
_pools[key] = new Queue <Surface>();
return(_pools[key]);
}
}
public bool TryAdd(TElement element, IntSize itemSize)
{
if (Contains(element))
{
// Already packed.
return(false);
}
else if (Insert(itemSize, out var rectangle))
{
// Rectangle was inserted, store element.
_elements[element] = rectangle;
return(true);
}
else
{
// Failed to insert
return(false);
}
}
protected override bool Insert(IntSize itemSize, out IntRectangle itemRect)
{
// Try to find suitable rectangle for item
if (TryGetSuitableFreeRect(itemSize, out var freeRect))
{
// Store the element and associate rectangle
itemRect = new IntRectangle(freeRect.Position, itemSize);
// Partition and merge the free rects
Partition(itemRect);
return(true);
}
else
{
// Unable to fit item into any rectangle
itemRect = default;
return(false);
}
}
/// <summary>
/// Loads an image directly from a block of bytes.
/// </summary>
/// <exception cref="InvalidOperationException">Thrown if an error was encountered when loading the image.</exception>
public unsafe Image(byte[] file)
{
// Decode from file to raw RGBA bytes
var result = ImageResult.FromMemory(file, ColorComponents.RedGreenBlueAlpha);
var width = result.Width;
var height = result.Height;
// Ensure image size is acceptable and no error while loading occurred
ValidateImageSize(in width, in height);
// Allocate pixels
Pixels = new ColorBytes[width * height];
_size = new IntSize(width, height);
// Copy grabbed pixels to image
fixed(byte *ptr = result.Data)
{
Copy((ColorBytes *)ptr, width, (0, 0, width, height), this, IntVector.Zero);
}
}
/// <summary>
/// Requests a temporary surface.
/// </summary>
/// <param name="size">The size of the surface.</param>
/// <param name="multisample">The multisample quality of the surface.</param>
/// <returns>A surface owned by this pool.</returns>
public static Surface Request(IntSize size, MultisampleQuality multisample = MultisampleQuality.None)
{
// Get the associated pool the specified multisample level
var pool = GetPool(size, multisample);
lock (pool)
{
if (pool.Count > 0)
{
// Return an existing surface
return(pool.Dequeue());
}
}
// The pool did not return a surface...
lock (_owned)
{
// Construct a new surface and return it.
var surface = new Surface(size, multisample);
_owned.Add(surface);
return(surface);
}
}
private bool TryGetSuitableFreeRect(IntSize itemSize, out IntRectangle freeRectangle)
{
freeRectangle = IntRectangle.Infinite;
var found = false;
//
foreach (var freeRect in _freeRects.OrderBy(r => r.Min.X + r.Min.Y))
{
// If the item can fit in here...
if (freeRect.Width >= itemSize.Width && freeRect.Height >= itemSize.Height)
{
// Select the free rect that causes minimal wasted area
if (minimizeArea(freeRectangle, freeRect, itemSize))
{
freeRectangle = freeRect;
found = true;
}
}
}
// Return if we found a suitable rectangle
return(found);
/// <summary>
/// Constructs a new instance of <see cref="IntRectangle"/>.
/// </summary>
/// <param name="position">The position of the rectangle.</param>
/// <param name="size">The size of the rectangle.</param>
public IntRectangle(IntVector position, IntSize size)
: this(position.X, position.Y, size.Width, size.Height)
{
}
/// <inheritdoc/>
public bool TryAdd(T element, IntSize itemSize)
{
return(((IRectanglePacker <T>)_impl).TryAdd(element, itemSize));
}
protected RectanglePackerImpl(IntSize size)
{
_elements = new Dictionary <TElement, IntRectangle>();
Size = size;
}
public MaxrectsPacker(IntSize size)
: base(size)
{
// Start clean
Clear();
}
protected abstract bool Insert(IntSize size, out IntRectangle rectangle);
/// <summary>
/// Creates a new surface.
/// </summary>
/// <param name="size">Size of the surface in pixels.</param>
/// <param name="multisample">MSAA to use on the surface</param>
/// <param name="surfaceType">The storage format of the surface.</param>
public Surface(IntSize size, MultisampleQuality multisample = MultisampleQuality.None, SurfaceType surfaceType = SurfaceType.UnsignedByte)
: this(size, multisample, surfaceType, false)
{
}
/// <summary>
/// Constructs a new blank image of the specified size.
/// </summary>
/// <param name="size">The size of the image in pixels.</param>
/// <exception cref="ArgumentException">Thrown when any dimension is negative or exceeds <see cref="MaxImageDimension"/>.</exception>
public Image(IntSize size)
: this(size.Width, size.Height)
{
}
internal void SetSize(IntSize size)
{
Size = size;
}
private bool CheckFitShelf(IntSize size, out int shelf)
{
shelf = Strips.Where(s => s.X < size.Width).Max(s => s.Y);
return(Size.Height - shelf >= size.Height);
}
/// <summary>
/// Rasterize a rectangular region.
/// </summary>
public static IEnumerable <IntVector> Rectangle(IntVector position, IntSize size)
{
return(Rectangle(position.X, position.Y, size.Width, size.Height));
}
/// <summary>
/// Constructs a new instance of <see cref="RectanglePacker{T}"/>.
/// </summary>
/// <param name="size">The size of the container rectangle.</param>
/// <param name="quality">The packing algorithm to use.</param>
public RectanglePacker(IntSize size, PackingAlgorithm quality = PackingAlgorithm.Maxrects)
: this(size.Width, size.Height, quality)
{
}
/// <summary>
/// Rasterize a rectangular region.
/// </summary>
public static IEnumerable <IntVector> Rectangle(IntSize size)
{
return(Rectangle(0, 0, size.Width, size.Height));
}