private void CalcBounds(DisplayObject obj,
Stage stage,
float scale,
bool intersectWithStage,
out Rectangle bounds,
out Rectangle boundsPOT)
{
float marginX;
float marginY;
// optimize for full-screen effects
if (obj == stage || obj == SparrowSharpApp.Root)
{
marginX = marginY = 0;
bounds = new Rectangle(0, 0, stage.Width, stage.Height);
}
else
{
marginX = MarginX;
marginY = MarginY;
bounds = obj.BoundsInSpace(stage);
}
if (intersectWithStage)
{
bounds = bounds.Intersection(stage.Bounds);
}
boundsPOT = null;
Rectangle result = bounds;
if (!result.IsEmpty())
{
// the bounds are a rectangle around the object, in stage coordinates,
// and with an optional margin.
bounds.Inflate(marginX, marginY);
// To fit into a POT-texture, we extend it towards the right and bottom.
int minSize = (int)(MIN_TEXTURE_SIZE / scale);
float minWidth = result.Width > minSize ? result.Width : minSize;
float minHeight = result.Height > minSize ? result.Height : minSize;
boundsPOT = new Rectangle(result.X,
result.Top,
NumberUtil.NextPowerOfTwo(minWidth * scale) / scale,
NumberUtil.NextPowerOfTwo(minHeight * scale) / scale);
}
}
private Texture CreateTexture(int width, int height, float scale)
{
int legalWidth = NumberUtil.NextPowerOfTwo(width * scale);
int legalHeight = NumberUtil.NextPowerOfTwo(height * scale);
TextureProperties texProps = new TextureProperties
{
TextureFormat = TextureFormat.Rgba8888,
Scale = scale,
Width = legalWidth,
Height = legalHeight,
NumMipmaps = 0,
PremultipliedAlpha = true
};
return(new GLTexture(IntPtr.Zero, texProps));
}
public static CutTree <U> Build <U>(IList <U> source, int from, int to, Func <CutTree <U>, CutTree <U>, U> calc)
{
if (to < from)
{
return(null);
}
int length = to - from + 1;
if (length == 1)
{
return(new CutTree <U>(from, to, source[from]));
}
int leftSize = NumberUtil.IsPowerOfTwo(length) ?
length / 2 :
NumberUtil.NextPowerOfTwo(length) / 2;
var leftTree = Build(source, from, from + leftSize - 1, calc);
var rightTree = Build(source, from + leftSize, to, calc);
return(new CutTree <U>(from, to, calc(leftTree, rightTree), leftTree, rightTree));
}
/// <summary>
/// Initializes a render texture with a certain ARGB color (0xAARRGGBB) and a scale factor.
/// </summary>
public RenderTexture(float width, float height, uint argbFillColor = 0x0, float scale = 1.0f)
{
int legalWidth = NumberUtil.NextPowerOfTwo(width * scale);
int legalHeight = NumberUtil.NextPowerOfTwo(height * scale);
TextureProperties properties = new TextureProperties
{
TextureFormat = Sparrow.Textures.TextureFormat.Rgba8888,
Scale = scale,
Width = legalWidth,
Height = legalHeight,
NumMipmaps = 0,
PremultipliedAlpha = true
};
Rectangle region = new Rectangle(0, 0, width, height);
GLTexture glTexture = new GLTexture(IntPtr.Zero, properties);
Init(glTexture, region);
_renderSupport = new RenderSupport();
Clear(argbFillColor, ColorUtil.GetA(argbFillColor) / 255.0f);
}
