private Rectangle RenderHelper(SpriteList spriteList, ICaretPosition caret)
{
var lines = SplitText(DisplayText);
if (TrimWhitespaces)
{
TrimLinesWhitespaces(lines);
}
var pos = new Vector2(0, Padding.Top + CalcVerticalTextPosition(lines));
caret.StartSync();
if (String.IsNullOrEmpty(DisplayText))
{
pos.X = CalcXByAlignment(lineWidth: 0);
caret.EmptyText(pos);
return(Rectangle.Empty);
}
caret.ClampTextPos(DisplayText.Length);
caret.ClampLine(lines.Count);
Rectangle rect = new Rectangle(Vector2.PositiveInfinity, Vector2.NegativeInfinity);
int i = 0;
foreach (var line in lines)
{
bool lastLine = ++i == lines.Count;
caret.ClampCol(line.Length - (lastLine ? 0 : 1));
float lineWidth = MeasureTextLine(line).X;
pos.X = CalcXByAlignment(lineWidth);
if (spriteList != null)
{
Renderer.DrawTextLine(
Font, pos, line, Color4.White, FontHeight, 0, line.Length, letterSpacing, spriteList, caret.Sync, -1);
}
Rectangle lineRect = new Rectangle(pos.X, pos.Y, pos.X + lineWidth, pos.Y + FontHeight);
if (lastLine)
{
// There is no end-of-text character, so simulate it.
caret.Sync(line.Length, new Vector2(lineRect.Right, lineRect.Top), Vector2.Down * fontHeight);
}
pos.Y += Spacing + FontHeight;
caret.NextLine();
rect = Rectangle.Bounds(rect, lineRect);
}
caret.FinishSync();
return(rect);
}
private void EnsureSpriteLists()
{
if (spriteLists == null)
{
PrepareRenderer();
spriteLists = new SpriteList[renderer.Styles.Count];
for (int i = 0; i < spriteLists.Length; i++)
{
spriteLists[i] = new SpriteList();
}
renderer.Render(spriteLists, Size, HAlignment, VAlignment, maxDisplayCharacters);
gradientMapIndices = new int[renderer.Styles.Count];
for (var i = 0; i < gradientMapIndices.Length; i++)
{
gradientMapIndices[i] = renderer.Styles[i].GradientMapIndex;
}
}
}
private void PrepareSpriteListAndExtent()
{
if (spriteList != null)
{
return;
}
if (OverflowMode == TextOverflowMode.Minify)
{
var savedSpacing = spacing;
var savedHeight = fontHeight;
FitTextInsideWidgetArea();
spriteList = new SpriteList();
extent = RenderHelper(spriteList, Caret);
spacing = savedSpacing;
fontHeight = savedHeight;
}
else
{
spriteList = new SpriteList();
extent = RenderHelper(spriteList, Caret);
}
}
protected override void OnRelease()
{
SpriteList = null;
base.OnRelease();
}
public static void DrawTextLine(
IFont font, Vector2 position, string text, Color4 color, float fontHeight, int start, int length, float letterSpacing,
SpriteList list, Action <int, Vector2, Vector2> onDrawChar = null, int tag = -1)
{
int j = 0;
if (list != null)
{
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch != '\n' && ch != '\r' && font.CharSource.Get(ch, fontHeight) != FontChar.Null)
{
++j;
}
}
}
// Use array instead of list to reduce memory consumption.
var chars = new SpriteList.CharDef[j];
j = 0;
FontChar prevChar = null;
var halfLetterSpacing = letterSpacing * .5f;
float savedX = position.X;
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch == '\n')
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
position.X = savedX;
position.Y += fontHeight;
prevChar = null;
continue;
}
else if (ch == '\r')
{
continue;
}
FontChar fontChar = font.CharSource.Get(ch, fontHeight);
if (fontChar == FontChar.Null)
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
continue;
}
var scale = fontChar.Height != 0.0f ? fontHeight / fontChar.Height : 0.0f;
// Pen Position + Bearing + Kerning gives a proper letter position
// but we have to subtract left padding in order to avoid extra spacing
position.X += scale * (fontChar.ACWidths.X + fontChar.Kerning(prevChar) + halfLetterSpacing - fontChar.Padding);
var size = new Vector2(scale * fontChar.PaddedWidth, fontHeight + scale * (fontChar.PaddedHeight - fontChar.VerticalOffset));
var charPosition = new Vector2(position.X, position.Y + scale * (fontChar.VerticalOffset - fontChar.Padding));
if (font.RoundCoordinates)
{
charPosition = new Vector2(charPosition.X.Round(), charPosition.Y.Round());
}
onDrawChar?.Invoke(i, charPosition, size);
chars[j].FontChar = fontChar;
chars[j].Position = charPosition;
++j;
// We have to add left padding to get actual letter position
// Width + (Horizontal Advance - Bearing) will give a proper pen position for next letter
position.X += scale * (fontChar.Width + fontChar.ACWidths.Y + halfLetterSpacing + fontChar.Padding);
prevChar = fontChar;
}
list.Add(font, color, fontHeight, chars, tag);
}
public static void DrawTextLine(
IFont font, Vector2 position, string text, Color4 color, float fontHeight, int start, int length, float letterSpacing,
SpriteList list, Action <int, Vector2, Vector2> onDrawChar = null, int tag = -1)
{
int j = 0;
if (list != null)
{
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch != '\n' && ch != '\r' && font.Chars.Get(ch, fontHeight) != FontChar.Null)
{
++j;
}
}
}
// Use array instead of list to reduce memory consumption.
var chars = new SpriteList.CharDef[j];
j = 0;
FontChar prevChar = null;
float savedX = position.X;
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch == '\n')
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
position.X = savedX;
position.Y += fontHeight;
prevChar = null;
continue;
}
else if (ch == '\r')
{
continue;
}
FontChar fontChar = font.Chars.Get(ch, fontHeight);
if (fontChar == FontChar.Null)
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
continue;
}
float scale = fontChar.Height != 0.0f ? fontHeight / fontChar.Height : 0.0f;
var xDelta = scale * (fontChar.ACWidths.X + fontChar.Kerning(prevChar) + letterSpacing);
position.X += xDelta;
var size = new Vector2(scale * fontChar.Width, fontHeight - fontChar.VerticalOffset);
Vector2 roundPos;
if (font.RoundCoordinates)
{
roundPos = new Vector2(position.X.Round(), position.Y.Round() + fontChar.VerticalOffset);
onDrawChar?.Invoke(i, new Vector2((position.X - xDelta).Round(), position.Y.Round()), size);
}
else
{
roundPos = new Vector2(position.X, position.Y + fontChar.VerticalOffset);
onDrawChar?.Invoke(i, new Vector2(position.X - xDelta, position.Y), size);
}
chars[j].FontChar = fontChar;
chars[j].Position = roundPos;
++j;
position.X += scale * (fontChar.Width + fontChar.ACWidths.Y);
prevChar = fontChar;
}
list.Add(font, color, fontHeight, chars, tag);
}