// 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 _drawTextBlob(TextBlob?textBlob, uiOffset offset, uiPaint paint)
{
D.assert(textBlob != null);
var state = this._currentLayer.currentState;
var scale = state.scale * this._devicePixelRatio;
var matrix = new uiMatrix3(state.matrix.Value);
matrix.preTranslate(offset.dx, offset.dy);
var mesh = TextBlobMesh.create(textBlob.Value, scale, matrix);
var textBlobBounds = matrix.mapRect(uiRectHelper.fromRect(textBlob.Value.boundsInText));
// request font texture so text mesh could be generated correctly
var style = textBlob.Value.style;
var font = FontManager.instance.getOrCreate(style.fontFamily, style.fontWeight, style.fontStyle).font;
var fontSizeToLoad = Mathf.CeilToInt(style.UnityFontSize * scale);
var subText = textBlob.Value.text.Substring(textBlob.Value.textOffset, textBlob.Value.textSize);
Texture tex = null;
bool notEmoji = !char.IsHighSurrogate(subText[0]) && !EmojiUtils.isSingleCharEmoji(subText[0]);
if (notEmoji)
{
font.RequestCharactersInTextureSafe(subText, fontSizeToLoad, style.UnityFontStyle);
tex = font.material.mainTexture;
}
if (paint.maskFilter != null && paint.maskFilter.Value.sigma != 0)
{
this._drawWithMaskFilter(textBlobBounds, paint, paint.maskFilter.Value, null, null, false, 0, 0, tex,
textBlobBounds, mesh, notEmoji, this.___drawTextDrawMeshCallback);
return;
}
this._drawTextDrawMeshCallback(paint, null, null, false, 0, 0, tex, textBlobBounds, mesh, notEmoji);
}
public void doLayout(float offset, TextBuff buff, int start, int count, TextStyle style)
{
this._start = start;
this._count = count;
this._advances.reset(count);
this._positions.reset(count);
this._advance = 0;
this._bounds = default;
Font font = FontManager.instance.getOrCreate(style.fontFamily, style.fontWeight, style.fontStyle).font;
char startingChar = buff.text[buff.offset + start];
if (char.IsHighSurrogate(startingChar) || EmojiUtils.isSingleCharEmoji(startingChar))
{
this.layoutEmoji(buff.text.Substring(buff.offset + start, count), style, font, start, count);
}
else
{
font.RequestCharactersInTextureSafe(buff.text, style.UnityFontSize, style.UnityFontStyle);
int wordstart = start == buff.size
? start
: LayoutUtils.getPrevWordBreakForCache(buff, start + 1);
int wordend;
for (int iter = start; iter < start + count; iter = wordend)
{
wordend = LayoutUtils.getNextWordBreakForCache(buff, iter);
int wordCount = Mathf.Min(start + count, wordend) - iter;
this.layoutWord(offset, iter - start, buff.subBuff(wordstart, wordend - wordstart),
iter - wordstart, wordCount, style, font);
wordstart = wordend;
}
}
this._count = count;
}
public uiMeshMesh resolveMesh()
{
if (this._resolved)
{
return(this._mesh);
}
this._resolved = true;
var style = this.textBlob.Value.style;
var text = this.textBlob.Value.text;
var key = MeshKey.create(this.textBlob.Value.instanceId, this.scale);
var fontInfo = FontManager.instance.getOrCreate(style.fontFamily, style.fontWeight, style.fontStyle);
var font = fontInfo.font;
_meshes.TryGetValue(key, out var meshInfo);
if (meshInfo != null && meshInfo.textureVersion == fontInfo.textureVersion)
{
ObjectPool <MeshKey> .release(key);
meshInfo.touch();
this._mesh = meshInfo.mesh.transform(this.matrix);
return(this._mesh);
}
// Handling Emoji
char startingChar = text[this.textBlob.Value.textOffset];
if (char.IsHighSurrogate(startingChar) || EmojiUtils.isSingleCharEmoji(startingChar))
{
var vert = ObjectPool <uiList <Vector3> > .alloc();
var tri = ObjectPool <uiList <int> > .alloc();
var uvCoord = ObjectPool <uiList <Vector2> > .alloc();
var metrics = FontMetrics.fromFont(font, style.UnityFontSize);
var minMaxRect = EmojiUtils.getMinMaxRect(style.fontSize, metrics.ascent, metrics.descent);
var minX = minMaxRect.left;
var maxX = minMaxRect.right;
var minY = minMaxRect.top;
var maxY = minMaxRect.bottom;
for (int i = 0; i < this.textBlob.Value.textSize; i++)
{
char a = text[this.textBlob.Value.textOffset + i];
int code = a;
if (char.IsHighSurrogate(a))
{
D.assert(i + 1 < this.textBlob.Value.textSize);
D.assert(this.textBlob.Value.textOffset + i + 1 < this.textBlob.Value.text.Length);
char b = text[this.textBlob.Value.textOffset + i + 1];
D.assert(char.IsLowSurrogate(b));
code = char.ConvertToUtf32(a, b);
}
else if (char.IsLowSurrogate(a) || EmojiUtils.isEmptyEmoji(a))
{
continue;
}
var uvRect = EmojiUtils.getUVRect(code);
var positionX = this.textBlob.Value.getPositionX(i);
int baseIndex = vert.Count;
vert.Add(new Vector3(positionX + minX, minY, 0));
vert.Add(new Vector3(positionX + maxX, minY, 0));
vert.Add(new Vector3(positionX + maxX, maxY, 0));
vert.Add(new Vector3(positionX + minX, maxY, 0));
tri.Add(baseIndex);
tri.Add(baseIndex + 1);
tri.Add(baseIndex + 2);
tri.Add(baseIndex);
tri.Add(baseIndex + 2);
tri.Add(baseIndex + 3);
uvCoord.Add(uvRect.bottomLeft.toVector());
uvCoord.Add(uvRect.bottomRight.toVector());
uvCoord.Add(uvRect.topRight.toVector());
uvCoord.Add(uvRect.topLeft.toVector());
if (char.IsHighSurrogate(a))
{
i++;
}
}
uiMeshMesh meshMesh = uiMeshMesh.create(null, vert, tri, uvCoord);
if (_meshes.ContainsKey(key))
{
ObjectPool <MeshInfo> .release(_meshes[key]);
_meshes.Remove(key);
}
_meshes[key] = MeshInfo.create(key, meshMesh, 0);
this._mesh = meshMesh.transform(this.matrix);
return(this._mesh);
}
var length = this.textBlob.Value.textSize;
var fontSizeToLoad = Mathf.CeilToInt(style.UnityFontSize * this.scale);
var vertices = ObjectPool <uiList <Vector3> > .alloc();
vertices.SetCapacity(length * 4);
var triangles = ObjectPool <uiList <int> > .alloc();
triangles.SetCapacity(length * 6);
var uv = ObjectPool <uiList <Vector2> > .alloc();
uv.SetCapacity(length * 4);
for (int charIndex = 0; charIndex < length; ++charIndex)
{
var ch = text[charIndex + this.textBlob.Value.textOffset];
// first char as origin for mesh position
var positionX = this.textBlob.Value.getPositionX(charIndex);
if (LayoutUtils.isWordSpace(ch) || LayoutUtils.isLineEndSpace(ch) || ch == '\t')
{
continue;
}
if (fontSizeToLoad == 0)
{
continue;
}
font.getGlyphInfo(ch, out var glyphInfo, fontSizeToLoad, style.UnityFontStyle);
var minX = glyphInfo.minX / this.scale;
var maxX = glyphInfo.maxX / this.scale;
var minY = -glyphInfo.maxY / this.scale;
var maxY = -glyphInfo.minY / this.scale;
var baseIndex = vertices.Count;
vertices.Add(new Vector3(positionX + minX, minY, 0));
vertices.Add(new Vector3(positionX + maxX, minY, 0));
vertices.Add(new Vector3(positionX + maxX, maxY, 0));
vertices.Add(new Vector3(positionX + minX, maxY, 0));
triangles.Add(baseIndex);
triangles.Add(baseIndex + 1);
triangles.Add(baseIndex + 2);
triangles.Add(baseIndex);
triangles.Add(baseIndex + 2);
triangles.Add(baseIndex + 3);
uv.Add(glyphInfo.uvTopLeft);
uv.Add(glyphInfo.uvTopRight);
uv.Add(glyphInfo.uvBottomRight);
uv.Add(glyphInfo.uvBottomLeft);
}
if (vertices.Count == 0)
{
this._mesh = null;
ObjectPool <uiList <Vector3> > .release(vertices);
ObjectPool <uiList <Vector2> > .release(uv);
ObjectPool <uiList <int> > .release(triangles);
ObjectPool <MeshKey> .release(key);
return(null);
}
uiMeshMesh mesh = vertices.Count > 0 ? uiMeshMesh.create(null, vertices, triangles, uv) : null;
if (_meshes.ContainsKey(key))
{
ObjectPool <MeshInfo> .release(_meshes[key]);
_meshes.Remove(key);
}
_meshes[key] = MeshInfo.create(key, mesh, fontInfo.textureVersion);
this._mesh = mesh.transform(this.matrix);
return(this._mesh);
}
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;
}
}
