private Rectangle32 Blit(
IntPtr source,
Rectangle32 sourceRectangle,
IntPtr destination,
Point32 destinationPosition)
{
Span <int> rects = stackalloc int[]
{
sourceRectangle.Position.X,
sourceRectangle.Position.Y,
sourceRectangle.Size.X,
sourceRectangle.Size.Y,
destinationPosition.X,
destinationPosition.Y,
0,
0
};
var result = _sdl.BlitSurface(
source,
rects[0],
destination,
ref rects[4]);
if (result < 0)
{
throw new SdlException("Error on surface blit: " + _sdl.GetError());
}
return(new Rectangle32(
new Point32(rects[4], rects[5]),
new Point32(rects[6], rects[7])));
}
private static void InnerPack(
this Rectangle32 r,
Point32 size,
int rightHeight,
int bottomWidth,
out Rectangle32 rx,
out Rectangle32 ry)
{
rx = new Rectangle32(
new Point32(r.Position.X + size.X, r.Position.Y),
new Point32(r.Size.X - size.X, rightHeight));
ry = new Rectangle32(
new Point32(r.Position.X, r.Position.Y + size.Y),
new Point32(bottomWidth, r.Size.Y - size.Y));
}
public static void Pack(
this Rectangle32 r,
Point32 size,
out Rectangle32 rx,
out Rectangle32 ry)
{
var fit = r.Size - size;
if (fit.X < fit.Y)
{
r.PackSmallX(size, out rx, out ry);
}
else
{
r.PackSmallY(size, out rx, out ry);
}
}
public Rectangle32(Point32 position, Point32 size)
{
Position = position;
Size = size;
}
public LineSegment32(Point32 a, Point32 b)
{
A = a;
B = b;
}
public static Rectangle32 Moved(this Rectangle32 r, Point32 offset) => new(r.Position + offset, r.Size);
public static void PackSmallY(
this Rectangle32 r,
Point32 size,
out Rectangle32 rx,
out Rectangle32 ry) => r.InnerPack(size, r.Size.Y, size.X, out rx, out ry);
public static int Min(this Point32 p) => Math.Min(p.X, p.Y);
public static bool AnyNegative(this Point32 p) => p.X < 0 || p.Y < 0;
public static bool AllPositive(this Point32 p) => 0 < p.X && 0 < p.Y;
public static Point32 Moved(this Point32 p, int dx, int dy) => new(p.X + dx, p.Y + dy);
public static int Max(this Point32 p) => Math.Max(p.X, p.Y);
public Circle32(Point32 center, int radius)
{
Center = center;
Radius = radius;
}