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Add layout info to MathImage

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This makes it possible to align images generated by MathImage alongside text, in an AttributedString for example.
This commit is contained in:
Daniel Resnick
2025-05-16 18:34:39 -06:00
parent 28184a044c
commit a73bf8d3f1
2 changed files with 20 additions and 7 deletions
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17
Sources/SwiftMath/MathBundle/MathImage.swift
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@@ -46,7 +46,16 @@ extension MathImage {
CGSize(width: displayList.width + contentInsets.left + contentInsets.right,
height: displayList.ascent + displayList.descent + contentInsets.top + contentInsets.bottom)
}
public mutating func asImage() -> (NSError?, MTImage?) {
public struct LayoutInfo {
public var ascent: CGFloat = 0
public var descent: CGFloat = 0
public init(ascent: CGFloat, descent: CGFloat) {
self.ascent = ascent
self.descent = descent
}
}
public mutating func asImage() -> (NSError?, MTImage?, LayoutInfo?) {
func layoutImage(size: CGSize, displayList: MTMathListDisplay) {
var textX = CGFloat(0)
switch self.textAlignment {
@@ -69,7 +78,7 @@ extension MathImage {
guard let mathList = MTMathListBuilder.build(fromString: latex, error: &error), error == nil,
let displayList = MTTypesetter.createLineForMathList(mathList, font: mtfont, style: currentStyle) else {
return (error, nil)
return (error, nil, nil)
}
intrinsicContentSize = intrinsicContentSize(displayList)
@@ -86,7 +95,7 @@ extension MathImage {
displayList.draw(rendererContext.cgContext)
rendererContext.cgContext.restoreGState()
}
return (nil, image)
return (nil, image, LayoutInfo(ascent: displayList.ascent, descent: displayList.descent))
#endif
#if os(macOS)
let image = NSImage(size: size, flipped: false) { bounds in
@@ -96,7 +105,7 @@ extension MathImage {
context.restoreGState()
return true
}
return (nil, image)
return (nil, image, LayoutInfo(ascent: displayList.ascent, descent: displayList.descent))
#endif
}
}