Remove setter.go

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 8
+charset = utf-8
+
+[*.md]
+indent_style = space
+indent_size = 2

README.md

@@ -2,7 +2,20 @@
 
 [![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/tomo/typeset.svg)](https://pkg.go.dev/git.tebibyte.media/tomo/typeset)
 
-Typeset provides utilities for text layout, wrapping, and rendering.
+Typeset provides utilities for text layout, wrapping, and rendering. It is
+designed to avoid redundant work and minimize memory allocations wherever
+posible in situations where the bounds of a section of text may change
+frequently and its content semi-frequently. Text layout is performed by the
+TypeSetter struct, which operates in a three-phase process:
 
-The state of a text layout is stored in a TypeSetter, and it can be drawn to any
-draw.Image using a Drawer which "extends" TypeSetter.
+1. Tokenization
+2. Measurement
+3. Layout, alignment
+
+The results of these phases are memoized. When the state of the TypeSetter is
+queried, it will run through only the required phases before returning a value.
+
+The contents of a TypeSetter can be drawn onto any draw.Image using the Draw
+function included within this package, but it is entirely possible to create a
+custom draw function that iterates over TypeSetter.Runes that uses some other
+method of drawing that's faster than five gazillion virtual method calls.

old/layout.go

@@ -149,6 +149,7 @@ func DoLine (text []rune, face font.Face, wrap bool, width fixed.Int26_6) (line
 
 	// set the width of the line's content.
 	line.Width = width
+	// TODO: just have RecommendedHeight want aligned layout?
 	if len(line.Words) > 0 {
 		lastWord := line.Words[len(line.Words) - 1]
 		line.ContentWidth = x - lastWord.SpaceAfter
@@ -228,6 +229,10 @@ func (line *LineLayout) justify (tabWidth fixed.Int26_6) {
 	}
 }
 
+func tabStop (x, tabWidth fixed.Int26_6, delta int) fixed.Int26_6 {
+	return fixed.I((tabWidth * 64 / x).Floor() + delta).Mul(tabWidth)
+}
+
 func tofuAdvance (face font.Face) fixed.Int26_6 {
 	if advance, ok := face.GlyphAdvance('M'); ok {
 		return advance