/// <summary>
/// Initializes a new instance of the <see cref="GlyphMetric"/> struct.
/// </summary>
/// <param name="codePoint">Unicode codepoint of the character.</param>
/// <param name="bounds">The bounds.</param>
/// <param name="isControlCharacter">Whether the character is a control character.</param>
public GlyphMetric(int codePoint, FontRectangle bounds, bool isControlCharacter)
{
this.Codepoint = codePoint;
this.Character = char.ConvertFromUtf32(codePoint);
this.Bounds = bounds;
this.IsControlCharacter = isControlCharacter;
}
internal FontRectangle BoundingBox(Vector2 dpi)
{
FontRectangle box = this.Glyph.BoundingBox(this.Location * dpi, dpi);
if (this.IsWhiteSpace)
{
box = new FontRectangle(box.X, box.Y, this.Width * dpi.X, box.Height);
}
return(box);
}
internal static FontRectangle GetBounds(IReadOnlyList <GlyphLayout> glyphLayouts, Vector2 dpi)
{
if (glyphLayouts.Count == 0)
{
return(FontRectangle.Empty);
}
bool hasSize = false;
float left = int.MaxValue;
float top = int.MaxValue;
float bottom = int.MinValue;
float right = int.MinValue;
for (int i = 0; i < glyphLayouts.Count; i++)
{
GlyphLayout c = glyphLayouts[i];
if (!c.IsControlCharacter)
{
hasSize = true;
FontRectangle box = c.BoundingBox(dpi);
if (left > box.Left)
{
left = box.Left;
}
if (top > box.Top)
{
top = box.Top;
}
if (bottom < box.Bottom)
{
bottom = box.Bottom;
}
if (right < box.Right)
{
right = box.Right;
}
}
}
if (!hasSize)
{
return(FontRectangle.Empty);
}
float width = right - left;
float height = bottom - top;
return(new FontRectangle(left, top, width, height));
}
/// <summary>
/// Renders the text.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="options">The style.</param>
public void RenderText(ReadOnlySpan <char> text, TextOptions options)
{
IReadOnlyList <GlyphLayout> glyphsToRender = this.layoutEngine.GenerateLayout(text, options);
FontRectangle rect = TextMeasurer.GetBounds(glyphsToRender, options.Dpi);
this.renderer.BeginText(rect);
foreach (GlyphLayout g in glyphsToRender)
{
if (g.IsWhiteSpace())
{
continue;
}
g.Glyph.RenderTo(this.renderer, g.Location, options);
}
this.renderer.EndText();
}
internal static FontRectangle GetBounds(IReadOnlyList <GlyphLayout> glyphLayouts, float dpi)
{
if (glyphLayouts.Count == 0)
{
return(FontRectangle.Empty);
}
float left = int.MaxValue;
float top = int.MaxValue;
float bottom = int.MinValue;
float right = int.MinValue;
for (int i = 0; i < glyphLayouts.Count; i++)
{
FontRectangle box = glyphLayouts[i].BoundingBox(dpi);
if (left > box.Left)
{
left = box.Left;
}
if (top > box.Top)
{
top = box.Top;
}
if (bottom < box.Bottom)
{
bottom = box.Bottom;
}
if (right < box.Right)
{
right = box.Right;
}
}
return(FontRectangle.FromLTRB(left, top, right, bottom));
}
/// <summary>
/// Initializes a new instance of the <see cref="GlyphBounds"/> struct.
/// </summary>
/// <param name="codePoint">The Unicode codepoint for the glyph.</param>
/// <param name="bounds">The glyph bounds.</param>
public GlyphBounds(CodePoint codePoint, FontRectangle bounds)
{
this.Codepoint = codePoint;
this.Bounds = bounds;
}
/// <summary>
/// Renders the glyph to the render surface in font units relative to a bottom left origin at (0,0)
/// </summary>
/// <param name="surface">The surface.</param>
/// <param name="pointSize">Size of the point.</param>
/// <param name="location">The location.</param>
/// <param name="dpi">The dpi.</param>
/// <param name="lineHeight">The lineHeight the current glyph was draw agains to offset topLeft while calling out to IGlyphRenderer.</param>
/// <exception cref="NotSupportedException">Too many control points</exception>
public void RenderTo(IGlyphRenderer surface, float pointSize, Vector2 location, Vector2 dpi, float lineHeight)
{
location = location * dpi;
Vector2 firstPoint = Vector2.Zero;
Vector2 scaledPoint = dpi * pointSize;
FontRectangle box = this.BoundingBox(location, scaledPoint);
var paramaters = new GlyphRendererParameters(this, pointSize, dpi);
if (surface.BeginGlyph(box, paramaters))
{
int startOfContor = 0;
int endOfContor = -1;
for (int i = 0; i < this.endPoints.Length; i++)
{
surface.BeginFigure();
startOfContor = endOfContor + 1;
endOfContor = this.endPoints[i];
Vector2 prev = Vector2.Zero;
Vector2 curr = this.GetPoint(ref scaledPoint, endOfContor) + location;
Vector2 next = this.GetPoint(ref scaledPoint, startOfContor) + location;
if (this.onCurves[endOfContor])
{
surface.MoveTo(curr);
}
else
{
if (this.onCurves[startOfContor])
{
surface.MoveTo(next);
}
else
{
// If both first and last points are off-curve, start at their middle.
Vector2 startPoint = (curr + next) / 2;
surface.MoveTo(startPoint);
}
}
int length = (endOfContor - startOfContor) + 1;
for (int p = 0; p < length; p++)
{
prev = curr;
curr = next;
int currentIndex = startOfContor + p;
int nextIndex = startOfContor + ((p + 1) % length);
int prevIndex = startOfContor + (((length + p) - 1) % length);
next = this.GetPoint(ref scaledPoint, nextIndex) + location;
if (this.onCurves[currentIndex])
{
// This is a straight line.
surface.LineTo(curr);
}
else
{
Vector2 prev2 = prev;
Vector2 next2 = next;
if (!this.onCurves[prevIndex])
{
prev2 = (curr + prev) / 2;
surface.LineTo(prev2);
}
if (!this.onCurves[nextIndex])
{
next2 = (curr + next) / 2;
}
surface.LineTo(prev2);
surface.QuadraticBezierTo(curr, next2);
}
}
surface.EndFigure();
}
}
surface.EndGlyph();
}