// Measure the length of the span of the text. Currently, this is only used to compute the length
// of ellipsis, assuming that the ellipsis does not contain any tab, tab is not considered for simplicity
public static float measureText(string text, TextStyle style)
{
char startingChar = text[0];
float totalWidth = 0;
if (char.IsHighSurrogate(startingChar) || EmojiUtils.isSingleCharEmoji(startingChar))
{
float advance = style.fontSize * EmojiUtils.advanceFactor + style.letterSpacing;
for (int i = 0; i < text.Length; i++)
{
char ch = text[i];
if (char.IsHighSurrogate(ch) || EmojiUtils.isSingleCharNonEmptyEmoji(ch))
{
totalWidth += advance;
}
}
}
else
{
Font font = FontManager.instance.getOrCreate(style.fontFamily, style.fontWeight, style.fontStyle).font;
font.RequestCharactersInTextureSafe(text, style.UnityFontSize, style.UnityFontStyle);
for (int i = 0; i < text.Length; i++)
{
char ch = text[i];
if (font.getGlyphInfo(ch, out var glyphInfo, style.UnityFontSize, style.UnityFontStyle))
{
totalWidth += glyphInfo.advance + style.letterSpacing;
}
void layoutEmoji(string text, TextStyle style, Font font, int start, int count)
{
for (int i = 0; i < count; i++)
{
char c = text[i];
float x = this._advance;
if (EmojiUtils.isSingleCharNonEmptyEmoji(c) || char.IsHighSurrogate(c))
{
float letterSpace = style.letterSpacing;
float letterSpaceHalfLeft = letterSpace * 0.5f;
float letterSpaceHalfRight = letterSpace - letterSpaceHalfLeft;
x += letterSpaceHalfLeft;
this._advances[i] += letterSpaceHalfLeft;
var metrics = FontMetrics.fromFont(font, style.UnityFontSize);
var minX = x;
var maxX = metrics.descent - metrics.ascent + x;
var minY = metrics.ascent;
var maxY = metrics.descent;
if (this._bounds.width <= 0 || this._bounds.height <= 0)
{
this._bounds = UnityEngine.Rect.MinMaxRect(
minX, minY, maxX, maxY);
}
else
{
if (minX < this._bounds.x)
{
this._bounds.x = minX;
}
if (minY < this._bounds.y)
{
this._bounds.y = minY;
}
if (maxX > this._bounds.xMax)
{
this._bounds.xMax = maxX;
}
if (maxY > this._bounds.yMax)
{
this._bounds.yMax = maxY;
}
}
this._positions[i] = x;
float advance = style.fontSize;
x += advance;
this._advances[i] += advance;
this._advances[i] += letterSpaceHalfRight;
x += letterSpaceHalfRight;
}
else
{
this._advances[i] = 0;
this._positions[i] = x;
}
this._advance = x;
}
}