Type TextEngine

type TextEngine interface {
	// Width is the advance of the whole line; 0 only for an empty line.
	Width(value string, size, weight float32) float32
	// Caret is the x of the caret at offset: the leading edge of the character at
	// offset, the trailing edge of the last one at the end, and where the display
	// puts that boundary in right-to-left text.
	Caret(value string, size, weight float32, offset int) float32
	// Selection appends the extents of [start, end) to dst, left to right: one span,
	// or several where the selection crosses a change of direction.
	Selection(dst []TextSpan, value string, size, weight float32, start, end int) []TextSpan
	// OffsetAt is the byte offset of the character boundary nearest x.
	OffsetAt(value string, size, weight, x float32) int
}