diff --git a/app/ime_test.go b/app/ime_test.go
index 61399c48..13abf902 100644
--- a/app/ime_test.go
+++ b/app/ime_test.go
@@ -29,7 +29,7 @@ func FuzzIME(f *testing.F) {
 	f.Add([]byte("20007800002\x02000"))
 	f.Add([]byte("200A02000990\x19002\x17\x0200"))
 	f.Fuzz(func(t *testing.T, cmds []byte) {
-		cache := text.NewShaper(gofont.Collection())
+		cache := text.NewShaper(text.WithCollection(gofont.Collection()))
 		e := new(widget.Editor)
 		e.Focus()
 
diff --git a/app/window.go b/app/window.go
index 93b3247a..342d2f62 100644
--- a/app/window.go
+++ b/app/window.go
@@ -26,6 +26,7 @@ import (
 	"gioui.org/io/system"
 	"gioui.org/layout"
 	"gioui.org/op"
+	"gioui.org/text"
 	"gioui.org/unit"
 	"gioui.org/widget"
 	"gioui.org/widget/material"
@@ -140,7 +141,8 @@ func NewWindow(options ...Option) *Window {
 	debug.Parse()
 	// Measure decoration height.
 	deco := new(widget.Decorations)
-	theme := material.NewTheme(gofont.Regular())
+	theme := material.NewTheme()
+	theme.Shaper = text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Regular()))
 	decoStyle := material.Decorations(theme, deco, 0, "")
 	gtx := layout.Context{
 		Ops: new(op.Ops),
diff --git a/font/font.go b/font/font.go
index 17628dfc..03d2485c 100644
--- a/font/font.go
+++ b/font/font.go
@@ -3,7 +3,9 @@ Package font provides type describing font faces attributes.
 */
 package font
 
-import "github.com/go-text/typesetting/font"
+import (
+	"github.com/go-text/typesetting/font"
+)
 
 // A FontFace is a Font and a matching Face.
 type FontFace struct {
diff --git a/go.mod b/go.mod
index 82fee842..733f01d5 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d
 	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2
 	gioui.org/shader v1.0.6
-	github.com/go-text/typesetting v0.0.0-20230602202114-9797aefac433
+	github.com/go-text/typesetting v0.0.0-20230717141307-09c70c30a055
 	golang.org/x/exp v0.0.0-20221012211006-4de253d81b95
 	golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91
 	golang.org/x/image v0.5.0
diff --git a/go.sum b/go.sum
index 935e3963..c6d4115f 100644
--- a/go.sum
+++ b/go.sum
@@ -5,9 +5,17 @@ gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJG
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
 gioui.org/shader v1.0.6 h1:cvZmU+eODFR2545X+/8XucgZdTtEjR3QWW6W65b0q5Y=
 gioui.org/shader v1.0.6/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
-github.com/go-text/typesetting v0.0.0-20230602202114-9797aefac433 h1:Pdyvqsfi1QYgFfZa4R8otBOtgO+CGyBDMEG8cM3jwvE=
-github.com/go-text/typesetting v0.0.0-20230602202114-9797aefac433/go.mod h1:KmrpWuSMFcO2yjmyhGpnBGQHSKAoEgMTSSzvLDzCuEA=
-github.com/go-text/typesetting-utils v0.0.0-20230412163830-89e4bcfa3ecc h1:9Kf84pnrmmjdRzZIkomfjowmGUhHs20jkrWYw/I6CYc=
+github.com/go-text/typesetting v0.0.0-20230707164345-04125e0ababa h1:Xmgc5QeEosRYq+xA98softsWg59xsxTxVkz3H0/YGrg=
+github.com/go-text/typesetting v0.0.0-20230707164345-04125e0ababa/go.mod h1:evDBbvNR/KaVFZ2ZlDSOWWXIUKq0wCOEtzLxRM8SG3k=
+github.com/go-text/typesetting v0.0.0-20230710184056-47dfb050bdaf h1:O193R8qIrI3mQ4mvqvY0jQZG34baUYquSMkPVQ1WPKo=
+github.com/go-text/typesetting v0.0.0-20230710184056-47dfb050bdaf/go.mod h1:evDBbvNR/KaVFZ2ZlDSOWWXIUKq0wCOEtzLxRM8SG3k=
+github.com/go-text/typesetting v0.0.0-20230712125615-69b99aaa3a6e h1:d7u1AMCEr4ICoqZfbPCKOTRr+x3c8mitMgn+JaPPgLU=
+github.com/go-text/typesetting v0.0.0-20230712125615-69b99aaa3a6e/go.mod h1:evDBbvNR/KaVFZ2ZlDSOWWXIUKq0wCOEtzLxRM8SG3k=
+github.com/go-text/typesetting v0.0.0-20230712171355-59e4e8ecaa7b h1:kNuq6ZZRTU8algnUUBqbwUnlHo1U2mbnpi6SaZPnnn0=
+github.com/go-text/typesetting v0.0.0-20230712171355-59e4e8ecaa7b/go.mod h1:evDBbvNR/KaVFZ2ZlDSOWWXIUKq0wCOEtzLxRM8SG3k=
+github.com/go-text/typesetting v0.0.0-20230717141307-09c70c30a055 h1:aUv3DYpk2eraRoyB7QZkyxgTVF7DrWcUui93iFRYO+8=
+github.com/go-text/typesetting v0.0.0-20230717141307-09c70c30a055/go.mod h1:evDBbvNR/KaVFZ2ZlDSOWWXIUKq0wCOEtzLxRM8SG3k=
+github.com/go-text/typesetting-utils v0.0.0-20230616150549-2a7df14b6a22 h1:LBQTFxP2MfsyEDqSKmUBZaDuDHN1vpqDyOZjcqS7MYI=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
diff --git a/gpu/internal/rendertest/bench_test.go b/gpu/internal/rendertest/bench_test.go
index 3ac066c7..7baece05 100644
--- a/gpu/internal/rendertest/bench_test.go
+++ b/gpu/internal/rendertest/bench_test.go
@@ -15,6 +15,7 @@ import (
 	"gioui.org/op"
 	"gioui.org/op/clip"
 	"gioui.org/op/paint"
+	"gioui.org/text"
 	"gioui.org/widget/material"
 )
 
@@ -33,7 +34,8 @@ func setupBenchmark(b *testing.B) (layout.Context, *headless.Window, *material.T
 		Ops:         ops,
 		Constraints: layout.Exact(sz),
 	}
-	th := material.NewTheme(gofont.Collection())
+	th := material.NewTheme()
+	th.Shaper = text.NewShaper(text.WithCollection(gofont.Collection()))
 	return gtx, w, th
 }
 
diff --git a/text/gotext.go b/text/gotext.go
index 6d729da8..00b039e1 100644
--- a/text/gotext.go
+++ b/text/gotext.go
@@ -6,12 +6,15 @@ import (
 	"bytes"
 	"image"
 	"io"
-	"sort"
+	"log"
+	"os"
 
 	"github.com/go-text/typesetting/di"
 	"github.com/go-text/typesetting/font"
+	"github.com/go-text/typesetting/fontscan"
 	"github.com/go-text/typesetting/language"
 	"github.com/go-text/typesetting/opentype/api"
+	"github.com/go-text/typesetting/opentype/api/metadata"
 	"github.com/go-text/typesetting/shaping"
 	"golang.org/x/exp/slices"
 	"golang.org/x/image/math/fixed"
@@ -19,6 +22,8 @@ import (
 
 	"gioui.org/f32"
 	giofont "gioui.org/font"
+	"gioui.org/font/opentype"
+	"gioui.org/internal/debug"
 	"gioui.org/io/system"
 	"gioui.org/op"
 	"gioui.org/op/clip"
@@ -152,112 +157,17 @@ type runLayout struct {
 	truncator bool
 }
 
-// faceOrderer chooses the order in which faces should be applied to text.
-type faceOrderer struct {
-	def                 giofont.Font
-	faceScratch         []font.Face
-	fontDefaultOrder    map[giofont.Font]int
-	defaultOrderedFonts []giofont.Font
-	faces               map[giofont.Font]font.Face
-	faceToIndex         map[font.Face]int
-	fonts               []giofont.Font
-}
-
-func (f *faceOrderer) insert(fnt giofont.Font, face font.Face) {
-	if len(f.fonts) == 0 {
-		f.def = fnt
-	}
-	if f.fontDefaultOrder == nil {
-		f.fontDefaultOrder = make(map[giofont.Font]int)
-	}
-	if f.faces == nil {
-		f.faces = make(map[giofont.Font]font.Face)
-		f.faceToIndex = make(map[font.Face]int)
-	}
-	f.fontDefaultOrder[fnt] = len(f.faceScratch)
-	f.defaultOrderedFonts = append(f.defaultOrderedFonts, fnt)
-	f.faceScratch = append(f.faceScratch, face)
-	f.fonts = append(f.fonts, fnt)
-	f.faces[fnt] = face
-	f.faceToIndex[face] = f.fontDefaultOrder[fnt]
-}
-
-// resetFontOrder restores the fonts to a predictable order. It should be invoked
-// before any operation searching the fonts.
-func (c *faceOrderer) resetFontOrder() {
-	copy(c.fonts, c.defaultOrderedFonts)
-}
-
-func (c *faceOrderer) indexFor(face font.Face) int {
-	return c.faceToIndex[face]
-}
-
-func (c *faceOrderer) faceFor(idx int) font.Face {
-	if idx < len(c.defaultOrderedFonts) {
-		return c.faces[c.defaultOrderedFonts[idx]]
-	}
-	panic("face index not found")
-}
-
-// TODO(whereswaldon): this function could sort all faces by appropriateness for the
-// given font characteristics. This would ensure that (if possible) text using a
-// fallback font would select similar weights and emphases to the primary font.
-func (c *faceOrderer) sortedFacesForStyle(font giofont.Font) []font.Face {
-	c.resetFontOrder()
-	primary, ok := c.fontForStyle(font)
-	if !ok {
-		font.Typeface = c.def.Typeface
-		primary, ok = c.fontForStyle(font)
-		if !ok {
-			primary = c.def
-		}
-	}
-	return c.sorted(primary)
-}
-
-// fontForStyle returns the closest existing font to the requested font within the
-// same typeface.
-func (c *faceOrderer) fontForStyle(font giofont.Font) (giofont.Font, bool) {
-	if closest, ok := closestFont(font, c.fonts); ok {
-		return closest, true
-	}
-	font.Style = giofont.Regular
-	if closest, ok := closestFont(font, c.fonts); ok {
-		return closest, true
-	}
-	return font, false
-}
-
-// faces returns a slice of faces with primary as the first element and
-// the remaining faces ordered by insertion order.
-func (f *faceOrderer) sorted(primary giofont.Font) []font.Face {
-	// If we find primary, put it first, and omit it from the below sort.
-	lowest := 0
-	for i := range f.fonts {
-		if f.fonts[i] == primary {
-			if i != 0 {
-				f.fonts[0], f.fonts[i] = f.fonts[i], f.fonts[0]
-			}
-			lowest = 1
-			break
-		}
-	}
-	sorting := f.fonts[lowest:]
-	sort.Slice(sorting, func(i, j int) bool {
-		a := sorting[i]
-		b := sorting[j]
-		return f.fontDefaultOrder[a] < f.fontDefaultOrder[b]
-	})
-	for i, font := range f.fonts {
-		f.faceScratch[i] = f.faces[font]
-	}
-	return f.faceScratch
-}
-
 // shaperImpl implements the shaping and line-wrapping of opentype fonts.
 type shaperImpl struct {
 	// Fields for tracking fonts/faces.
-	orderer faceOrderer
+	fontMap      *fontscan.FontMap
+	faces        []font.Face
+	faceToIndex  map[font.Font]int
+	faceMeta     []giofont.Font
+	defaultFaces []string
+	logger       interface {
+		Printf(format string, args ...any)
+	}
 
 	// Shaping and wrapping state.
 	shaper        shaping.HarfbuzzShaper
@@ -274,11 +184,60 @@ type shaperImpl struct {
 	bitmapGlyphCache bitmapCache
 }
 
+// debugLogger only logs messages if debug.Text is true.
+type debugLogger struct {
+	*log.Logger
+}
+
+func newDebugLogger() debugLogger {
+	return debugLogger{Logger: log.New(log.Writer(), "[text] ", log.Default().Flags())}
+}
+
+func (d debugLogger) Printf(format string, args ...any) {
+	if debug.Text.Load() {
+		d.Logger.Printf(format, args...)
+	}
+}
+
+func newShaperImpl(systemFonts bool, collection []FontFace) *shaperImpl {
+	var shaper shaperImpl
+	shaper.logger = newDebugLogger()
+	shaper.fontMap = fontscan.NewFontMap(shaper.logger)
+	shaper.faceToIndex = make(map[font.Font]int)
+	if systemFonts {
+		str, err := os.UserCacheDir()
+		if err != nil {
+			shaper.logger.Printf("failed resolving font cache dir: %v", err)
+			shaper.logger.Printf("skipping system font load")
+		}
+		if err := shaper.fontMap.UseSystemFonts(str); err != nil {
+			shaper.logger.Printf("failed loading system fonts: %v", err)
+		}
+	}
+	for _, f := range collection {
+		shaper.Load(f)
+		shaper.defaultFaces = append(shaper.defaultFaces, string(f.Font.Typeface))
+	}
+	shaper.shaper.SetFontCacheSize(32)
+	return &shaper
+}
+
 // Load registers the provided FontFace with the shaper, if it is compatible.
 // It returns whether the face is now available for use. FontFaces are prioritized
 // in the order in which they are loaded, with the first face being the default.
 func (s *shaperImpl) Load(f FontFace) {
-	s.orderer.insert(f.Font, f.Face.Face())
+	s.fontMap.AddFace(f.Face.Face(), opentype.FontToDescription(f.Font))
+	s.addFace(f.Face.Face(), f.Font)
+}
+
+func (s *shaperImpl) addFace(f font.Face, md giofont.Font) {
+	if _, ok := s.faceToIndex[f.Font]; ok {
+		return
+	}
+	idx := len(s.faces)
+	s.faceToIndex[f.Font] = idx
+	s.faces = append(s.faces, f)
+	s.faceMeta = append(s.faceMeta, md)
 }
 
 // splitByScript divides the inputs into new, smaller inputs on script boundaries
@@ -362,9 +321,26 @@ func (s *shaperImpl) splitBidi(input shaping.Input) []shaping.Input {
 	return splitInputs
 }
 
+// ResolveFace allows shaperImpl to implement shaping.FontMap, wrapping its fontMap
+// field and ensuring that any faces loaded as part of the search are registered with
+// ids so that they can be referred to by a GlyphID.
+func (s *shaperImpl) ResolveFace(r rune) font.Face {
+	face := s.fontMap.ResolveFace(r)
+	if face != nil {
+		family, aspect := s.fontMap.FontMetadata(face.Font)
+		md := opentype.DescriptionToFont(metadata.Description{
+			Family: family,
+			Aspect: aspect,
+		})
+		s.addFace(face, md)
+		return face
+	}
+	return nil
+}
+
 // splitByFaces divides the inputs by font coverage in the provided faces. It will use the slice provided in buf
 // as the backing storage of the returned slice if buf is non-nil.
-func (s *shaperImpl) splitByFaces(inputs []shaping.Input, faces []font.Face, buf []shaping.Input) []shaping.Input {
+func (s *shaperImpl) splitByFaces(inputs []shaping.Input, buf []shaping.Input) []shaping.Input {
 	var split []shaping.Input
 	if buf == nil {
 		split = make([]shaping.Input, 0, len(inputs))
@@ -372,34 +348,78 @@ func (s *shaperImpl) splitByFaces(inputs []shaping.Input, faces []font.Face, buf
 		split = buf
 	}
 	for _, input := range inputs {
-		split = append(split, shaping.SplitByFontGlyphs(input, faces)...)
+		split = append(split, shaping.SplitByFace(input, s)...)
 	}
 	return split
 }
 
 // shapeText invokes the text shaper and returns the raw text data in the shaper's native
 // format. It does not wrap lines.
-func (s *shaperImpl) shapeText(faces []font.Face, ppem fixed.Int26_6, lc system.Locale, txt []rune) []shaping.Output {
-	if len(faces) < 1 {
-		return nil
-	}
+func (s *shaperImpl) shapeText(ppem fixed.Int26_6, lc system.Locale, txt []rune) []shaping.Output {
 	lcfg := langConfig{
 		Language:  language.NewLanguage(lc.Language),
 		Direction: mapDirection(lc.Direction),
 	}
 	// Create an initial input.
-	input := toInput(faces[0], ppem, lcfg, txt)
+	input := toInput(nil, ppem, lcfg, txt)
+	if input.RunStart == input.RunEnd && len(s.faces) > 0 {
+		// Give the empty string a face. This is a necessary special case because
+		// the face splitting process works by resolving faces for each rune, and
+		// the empty string contains no runes.
+		input.Face = s.faces[0]
+	}
 	// Break input on font glyph coverage.
 	inputs := s.splitBidi(input)
-	inputs = s.splitByFaces(inputs, faces, s.splitScratch1[:0])
+	inputs = s.splitByFaces(inputs, s.splitScratch1[:0])
 	inputs = splitByScript(inputs, lcfg.Direction, s.splitScratch2[:0])
 	// Shape all inputs.
 	if needed := len(inputs) - len(s.outScratchBuf); needed > 0 {
 		s.outScratchBuf = slices.Grow(s.outScratchBuf, needed)
 	}
-	s.outScratchBuf = s.outScratchBuf[:len(inputs)]
-	for i := range inputs {
-		s.outScratchBuf[i] = s.shaper.Shape(inputs[i])
+	s.outScratchBuf = s.outScratchBuf[:0]
+	for _, input := range inputs {
+		if input.Face != nil {
+			s.outScratchBuf = append(s.outScratchBuf, s.shaper.Shape(input))
+		} else {
+			s.outScratchBuf = append(s.outScratchBuf, shaping.Output{
+				// Use the text size as the advance of the entire fake run so that
+				// it doesn't occupy zero space.
+				Advance: input.Size,
+				Size:    input.Size,
+				Glyphs: []shaping.Glyph{
+					{
+						Width:        input.Size,
+						Height:       input.Size,
+						XBearing:     0,
+						YBearing:     0,
+						XAdvance:     input.Size,
+						YAdvance:     input.Size,
+						XOffset:      0,
+						YOffset:      0,
+						ClusterIndex: input.RunStart,
+						RuneCount:    input.RunEnd - input.RunStart,
+						GlyphCount:   1,
+						GlyphID:      0,
+						Mask:         0,
+					},
+				},
+				LineBounds: shaping.Bounds{
+					Ascent:  input.Size,
+					Descent: 0,
+					Gap:     0,
+				},
+				GlyphBounds: shaping.Bounds{
+					Ascent:  input.Size,
+					Descent: 0,
+					Gap:     0,
+				},
+				Direction: input.Direction,
+				Runes: shaping.Range{
+					Offset: input.RunStart,
+					Count:  input.RunEnd - input.RunStart,
+				},
+			})
+		}
 	}
 	return s.outScratchBuf
 }
@@ -416,22 +436,26 @@ func wrapPolicyToGoText(p WrapPolicy) shaping.LineBreakPolicy {
 }
 
 // shapeAndWrapText invokes the text shaper and returns wrapped lines in the shaper's native format.
-func (s *shaperImpl) shapeAndWrapText(faces []font.Face, params Parameters, txt []rune) (_ []shaping.Line, truncated int) {
+func (s *shaperImpl) shapeAndWrapText(params Parameters, txt []rune) (_ []shaping.Line, truncated int) {
 	wc := shaping.WrapConfig{
 		TruncateAfterLines: params.MaxLines,
 		TextContinues:      params.forceTruncate,
 		BreakPolicy:        wrapPolicyToGoText(params.WrapPolicy),
 	}
+	s.fontMap.SetQuery(fontscan.Query{
+		Families: []string{string(params.Font.Typeface)},
+		Aspect:   opentype.FontToDescription(params.Font).Aspect,
+	})
 	if wc.TruncateAfterLines > 0 {
 		if len(params.Truncator) == 0 {
 			params.Truncator = "…"
 		}
 		// We only permit a single run as the truncator, regardless of whether more were generated.
 		// Just use the first one.
-		wc.Truncator = s.shapeText(faces, params.PxPerEm, params.Locale, []rune(params.Truncator))[0]
+		wc.Truncator = s.shapeText(params.PxPerEm, params.Locale, []rune(params.Truncator))[0]
 	}
 	// Wrap outputs into lines.
-	return s.wrapper.WrapParagraph(wc, params.MaxWidth, txt, shaping.NewSliceIterator(s.shapeText(faces, params.PxPerEm, params.Locale, txt)))
+	return s.wrapper.WrapParagraph(wc, params.MaxWidth, txt, shaping.NewSliceIterator(s.shapeText(params.PxPerEm, params.Locale, txt)))
 }
 
 // replaceControlCharacters replaces problematic unicode
@@ -494,7 +518,7 @@ func (s *shaperImpl) LayoutRunes(params Parameters, txt []rune) document {
 	if hasNewline {
 		txt = txt[:len(txt)-1]
 	}
-	ls, truncated := s.shapeAndWrapText(s.orderer.sortedFacesForStyle(params.Font), params, replaceControlCharacters(txt))
+	ls, truncated := s.shapeAndWrapText(params, replaceControlCharacters(txt))
 
 	didTruncate := truncated > 0 || (params.forceTruncate && params.MaxLines == len(ls))
 
@@ -508,7 +532,7 @@ func (s *shaperImpl) LayoutRunes(params Parameters, txt []rune) document {
 	textLines := make([]line, len(ls))
 	maxHeight := fixed.Int26_6(0)
 	for i := range ls {
-		otLine := toLine(&s.orderer, ls[i], params.Locale.Direction)
+		otLine := toLine(s.faceToIndex, ls[i], params.Locale.Direction)
 		if otLine.lineHeight > maxHeight {
 			maxHeight = otLine.lineHeight
 		}
@@ -597,7 +621,13 @@ func (s *shaperImpl) Shape(pathOps *op.Ops, gs []Glyph) clip.PathSpec {
 			x = g.X
 		}
 		ppem, faceIdx, gid := splitGlyphID(g.ID)
-		face := s.orderer.faceFor(faceIdx)
+		if faceIdx >= len(s.faces) {
+			continue
+		}
+		face := s.faces[faceIdx]
+		if face == nil {
+			continue
+		}
 		scaleFactor := fixedToFloat(ppem) / float32(face.Upem())
 		glyphData := face.GlyphData(gid)
 		switch glyphData := glyphData.(type) {
@@ -671,7 +701,13 @@ func (s *shaperImpl) Bitmaps(ops *op.Ops, gs []Glyph) op.CallOp {
 			x = g.X
 		}
 		_, faceIdx, gid := splitGlyphID(g.ID)
-		face := s.orderer.faceFor(faceIdx)
+		if faceIdx >= len(s.faces) {
+			continue
+		}
+		face := s.faces[faceIdx]
+		if face == nil {
+			continue
+		}
 		glyphData := face.GlyphData(gid)
 		switch glyphData := glyphData.(type) {
 		case api.GlyphBitmap:
@@ -799,7 +835,7 @@ func toGioGlyphs(in []shaping.Glyph, ppem fixed.Int26_6, faceIdx int) []glyph {
 }
 
 // toLine converts the output into a Line with the provided dominant text direction.
-func toLine(orderer *faceOrderer, o shaping.Line, dir system.TextDirection) line {
+func toLine(faceToIndex map[font.Font]int, o shaping.Line, dir system.TextDirection) line {
 	if len(o) < 1 {
 		return line{}
 	}
@@ -813,8 +849,12 @@ func toLine(orderer *faceOrderer, o shaping.Line, dir system.TextDirection) line
 		if run.Size > maxSize {
 			maxSize = run.Size
 		}
+		var font font.Font
+		if run.Face != nil {
+			font = run.Face.Font
+		}
 		line.runs[i] = runLayout{
-			Glyphs: toGioGlyphs(run.Glyphs, run.Size, orderer.indexFor(run.Face)),
+			Glyphs: toGioGlyphs(run.Glyphs, run.Size, faceToIndex[font]),
 			Runes: Range{
 				Count:  run.Runes.Count,
 				Offset: line.runeCount,
@@ -916,43 +956,3 @@ func computeVisualOrder(l *line) {
 		x += l.runs[runIdx].Advance
 	}
 }
-
-// closestFont returns the closest Font in available by weight.
-// In case of equality the lighter weight will be returned.
-func closestFont(lookup giofont.Font, available []giofont.Font) (giofont.Font, bool) {
-	found := false
-	var match giofont.Font
-	for _, cf := range available {
-		if cf == lookup {
-			return lookup, true
-		}
-		if cf.Typeface != lookup.Typeface || cf.Style != lookup.Style {
-			continue
-		}
-		if !found {
-			found = true
-			match = cf
-			continue
-		}
-		cDist := weightDistance(lookup.Weight, cf.Weight)
-		mDist := weightDistance(lookup.Weight, match.Weight)
-		if cDist < mDist {
-			match = cf
-		} else if cDist == mDist && cf.Weight < match.Weight {
-			match = cf
-		}
-	}
-	return match, found
-}
-
-// weightDistance returns the distance value between two font weights.
-func weightDistance(wa giofont.Weight, wb giofont.Weight) int {
-	// Avoid dealing with negative Weight values.
-	a := int(wa) + 400
-	b := int(wb) + 400
-	diff := a - b
-	if diff < 0 {
-		return -diff
-	}
-	return diff
-}
diff --git a/text/gotext_test.go b/text/gotext_test.go
index aec3af5a..71356c0b 100644
--- a/text/gotext_test.go
+++ b/text/gotext_test.go
@@ -30,11 +30,12 @@ var arabic = system.Locale{
 }
 
 func testShaper(faces ...giofont.Face) *shaperImpl {
-	shaper := shaperImpl{}
+	ff := make([]FontFace, 0, len(faces))
 	for _, face := range faces {
-		shaper.Load(FontFace{Face: face})
+		ff = append(ff, FontFace{Face: face})
 	}
-	return &shaper
+	shaper := newShaperImpl(false, ff)
+	return shaper
 }
 
 func TestEmptyString(t *testing.T) {
@@ -64,6 +65,18 @@ func TestEmptyString(t *testing.T) {
 	}
 }
 
+func TestNoFaces(t *testing.T) {
+	ppem := fixed.I(200)
+	shaper := testShaper()
+
+	// Ensure shaping text with no faces does not panic.
+	shaper.LayoutRunes(Parameters{
+		PxPerEm:  ppem,
+		MaxWidth: 2000,
+		Locale:   english,
+	}, []rune("✨ⷽℎ↞⋇ⱜ⪫⢡⽛⣦␆Ⱨⳏ⳯⒛⭣╎⌞⟻⢇┃➡⬎⩱⸇ⷎ⟅▤⼶⇺⩳⎏⤬⬞ⴈ⋠⿶⢒₍☟⽂ⶦ⫰⭢⌹∼▀⾯⧂❽⩏ⓖ⟅⤔⍇␋⽓ₑ⢳⠑❂⊪⢘⽨⃯▴ⷿ"))
+}
+
 func TestAlignWidth(t *testing.T) {
 	lines := []line{
 		{width: fixed.I(50)},
@@ -288,13 +301,13 @@ func makeTestText(shaper *shaperImpl, primaryDir system.TextDirection, fontSize,
 			rtlSource = string(complexRunes[:runeLimit])
 		}
 	}
-	simpleText, _ := shaper.shapeAndWrapText(shaper.orderer.sortedFacesForStyle(giofont.Font{}), Parameters{
+	simpleText, _ := shaper.shapeAndWrapText(Parameters{
 		PxPerEm:  fixed.I(fontSize),
 		MaxWidth: lineWidth,
 		Locale:   locale,
 	}, []rune(simpleSource))
 	simpleText = copyLines(simpleText)
-	complexText, _ := shaper.shapeAndWrapText(shaper.orderer.sortedFacesForStyle(giofont.Font{}), Parameters{
+	complexText, _ := shaper.shapeAndWrapText(Parameters{
 		PxPerEm:  fixed.I(fontSize),
 		MaxWidth: lineWidth,
 		Locale:   locale,
@@ -378,7 +391,7 @@ func TestToLine(t *testing.T) {
 					totalInputGlyphs += len(run.Glyphs)
 					totalInputRunes += run.Runes.Count
 				}
-				output := toLine(&shaper.orderer, input, tc.dir)
+				output := toLine(shaper.faceToIndex, input, tc.dir)
 				if output.bounds.Min == (fixed.Point26_6{}) {
 					t.Errorf("line %d: Bounds.Min not populated", i)
 				}
@@ -662,106 +675,6 @@ func TestTextAppend(t *testing.T) {
 	}
 }
 
-func TestClosestFontByWeight(t *testing.T) {
-	const (
-		testTF1 giofont.Typeface = "MockFace"
-		testTF2 giofont.Typeface = "TestFace"
-		testTF3 giofont.Typeface = "AnotherFace"
-	)
-	fonts := []giofont.Font{
-		{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Normal},
-		{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Light},
-		{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Bold},
-		{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Thin},
-	}
-	weightOnlyTests := []struct {
-		Lookup   giofont.Weight
-		Expected giofont.Weight
-	}{
-		// Test for existing weights.
-		{Lookup: giofont.Normal, Expected: giofont.Normal},
-		{Lookup: giofont.Light, Expected: giofont.Light},
-		{Lookup: giofont.Bold, Expected: giofont.Bold},
-		// Test for missing weights.
-		{Lookup: giofont.Thin, Expected: giofont.Light},
-		{Lookup: giofont.ExtraLight, Expected: giofont.Light},
-		{Lookup: giofont.Medium, Expected: giofont.Normal},
-		{Lookup: giofont.SemiBold, Expected: giofont.Bold},
-		{Lookup: giofont.ExtraBold, Expected: giofont.Bold},
-	}
-	for _, test := range weightOnlyTests {
-		got, ok := closestFont(giofont.Font{Typeface: testTF1, Weight: test.Lookup}, fonts)
-		if !ok {
-			t.Errorf("expected closest font for %v to exist", test.Lookup)
-		}
-		if got.Weight != test.Expected {
-			t.Errorf("got weight %v, expected %v", got.Weight, test.Expected)
-		}
-	}
-	fonts = []giofont.Font{
-		{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Light},
-		{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Bold},
-		{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Normal},
-		{Typeface: testTF3, Style: giofont.Italic, Weight: giofont.Bold},
-	}
-	otherTests := []struct {
-		Lookup         giofont.Font
-		Expected       giofont.Font
-		ExpectedToFail bool
-	}{
-		// Test for existing fonts.
-		{
-			Lookup:   giofont.Font{Typeface: testTF1, Weight: giofont.Light},
-			Expected: giofont.Font{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Light},
-		},
-		{
-			Lookup:   giofont.Font{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Normal},
-			Expected: giofont.Font{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Normal},
-		},
-		// Test for missing fonts.
-		{
-			Lookup:   giofont.Font{Typeface: testTF1, Weight: giofont.Normal},
-			Expected: giofont.Font{Typeface: testTF1, Style: giofont.Regular, Weight: giofont.Light},
-		},
-		{
-			Lookup:   giofont.Font{Typeface: testTF3, Style: giofont.Italic, Weight: giofont.Normal},
-			Expected: giofont.Font{Typeface: testTF3, Style: giofont.Italic, Weight: giofont.Bold},
-		},
-		{
-			Lookup:   giofont.Font{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Thin},
-			Expected: giofont.Font{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Normal},
-		},
-		{
-			Lookup:   giofont.Font{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Bold},
-			Expected: giofont.Font{Typeface: testTF1, Style: giofont.Italic, Weight: giofont.Normal},
-		},
-		{
-			Lookup:         giofont.Font{Typeface: testTF2, Weight: giofont.Normal},
-			ExpectedToFail: true,
-		},
-		{
-			Lookup:         giofont.Font{Typeface: testTF2, Style: giofont.Italic, Weight: giofont.Normal},
-			ExpectedToFail: true,
-		},
-	}
-	for _, test := range otherTests {
-		got, ok := closestFont(test.Lookup, fonts)
-		if test.ExpectedToFail {
-			if ok {
-				t.Errorf("expected closest font for %v to not exist", test.Lookup)
-			} else {
-				continue
-			}
-		}
-		if !ok {
-			t.Errorf("expected closest font for %v to exist", test.Lookup)
-		}
-		if got != test.Expected {
-			t.Errorf("got %v, expected %v", got, test.Expected)
-		}
-	}
-}
-
 func TestGlyphIDPacking(t *testing.T) {
 	const maxPPem = fixed.Int26_6((1 << sizebits) - 1)
 	type testcase struct {
diff --git a/text/shaper.go b/text/shaper.go
index bcab39e3..f5d347fe 100644
--- a/text/shaper.go
+++ b/text/shaper.go
@@ -201,6 +201,11 @@ type GlyphID uint64
 
 // Shaper converts strings of text into glyphs that can be displayed.
 type Shaper struct {
+	config struct {
+		disableSystemFonts bool
+		collection         []FontFace
+	}
+	initialized      bool
 	shaper           shaperImpl
 	pathCache        pathCache
 	bitmapShapeCache bitmapShapeCache
@@ -223,26 +228,53 @@ type Shaper struct {
 	err  error
 }
 
+// ShaperOptions configure text shapers.
+type ShaperOption func(*Shaper)
+
+// NoSystemFonts can be used to disable system font loading.
+func NoSystemFonts() ShaperOption {
+	return func(s *Shaper) {
+		s.config.disableSystemFonts = true
+	}
+}
+
+// WithCollection can be used to provide a collection of pre-loaded fonts to the shaper.
+func WithCollection(collection []FontFace) ShaperOption {
+	return func(s *Shaper) {
+		s.config.collection = collection
+	}
+}
+
 // NewShaper constructs a shaper with the provided collection of font faces
 // available.
-func NewShaper(collection []FontFace) *Shaper {
+func NewShaper(options ...ShaperOption) *Shaper {
 	l := &Shaper{}
-	for _, f := range collection {
-		l.shaper.Load(f)
+	for _, opt := range options {
+		opt(l)
 	}
-	l.shaper.shaper.SetFontCacheSize(32)
-	l.reader = bufio.NewReader(nil)
+	l.init()
 	return l
 }
 
+func (l *Shaper) init() {
+	if l.initialized {
+		return
+	}
+	l.initialized = true
+	l.reader = bufio.NewReader(nil)
+	l.shaper = *newShaperImpl(!l.config.disableSystemFonts, l.config.collection)
+}
+
 // Layout text from an io.Reader according to a set of options. Results can be retrieved by
 // iteratively calling NextGlyph.
 func (l *Shaper) Layout(params Parameters, txt io.Reader) {
+	l.init()
 	l.layoutText(params, txt, "")
 }
 
 // LayoutString is Layout for strings.
 func (l *Shaper) LayoutString(params Parameters, str string) {
+	l.init()
 	l.layoutText(params, nil, str)
 }
 
@@ -368,6 +400,7 @@ func (l *Shaper) layoutParagraph(params Parameters, asStr string, asBytes []byte
 // NextGlyph returns the next glyph from the most recent shaping operation, if
 // any. If there are no more glyphs, ok will be false.
 func (l *Shaper) NextGlyph() (_ Glyph, ok bool) {
+	l.init()
 	if l.done {
 		return Glyph{}, false
 	}
@@ -535,6 +568,7 @@ func splitGlyphID(g GlyphID) (fixed.Int26_6, int, font.GID) {
 // of all vector glyphs.
 // All glyphs are expected to be from a single line of text (their Y offsets are ignored).
 func (l *Shaper) Shape(gs []Glyph) clip.PathSpec {
+	l.init()
 	key := l.pathCache.hashGlyphs(gs)
 	shape, ok := l.pathCache.Get(key, gs)
 	if ok {
@@ -551,6 +585,7 @@ func (l *Shaper) Shape(gs []Glyph) clip.PathSpec {
 // same gs slice.
 // All glyphs are expected to be from a single line of text (their Y offsets are ignored).
 func (l *Shaper) Bitmaps(gs []Glyph) op.CallOp {
+	l.init()
 	key := l.bitmapShapeCache.hashGlyphs(gs)
 	call, ok := l.bitmapShapeCache.Get(key, gs)
 	if ok {
diff --git a/text/shaper_test.go b/text/shaper_test.go
index 05cb694f..909fc2d0 100644
--- a/text/shaper_test.go
+++ b/text/shaper_test.go
@@ -22,7 +22,7 @@ func TestWrappingTruncation(t *testing.T) {
 	textInput := "Lorem ipsum dolor sit amet, consectetur adipiscing elit,\nsed do eiusmod tempor incididunt ut labore et\ndolore magna aliqua.\n"
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	collection := []FontFace{{Face: ltrFace}}
-	cache := NewShaper(collection)
+	cache := NewShaper(NoSystemFonts(), WithCollection(collection))
 	cache.LayoutString(Parameters{
 		Alignment: Middle,
 		PxPerEm:   fixed.I(10),
@@ -89,7 +89,7 @@ func TestWrappingForcedTruncation(t *testing.T) {
 	textInput := "Lorem ipsum\ndolor sit\namet"
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	collection := []FontFace{{Face: ltrFace}}
-	cache := NewShaper(collection)
+	cache := NewShaper(NoSystemFonts(), WithCollection(collection))
 	cache.LayoutString(Parameters{
 		Alignment: Middle,
 		PxPerEm:   fixed.I(10),
@@ -165,7 +165,7 @@ func TestShapingNewlineHandling(t *testing.T) {
 		t.Run(fmt.Sprintf("%q", tc.textInput), func(t *testing.T) {
 			ltrFace, _ := opentype.Parse(goregular.TTF)
 			collection := []FontFace{{Face: ltrFace}}
-			cache := NewShaper(collection)
+			cache := NewShaper(NoSystemFonts(), WithCollection(collection))
 			checkGlyphs := func() {
 				glyphs := []Glyph{}
 				for g, ok := cache.NextGlyph(); ok; g, ok = cache.NextGlyph() {
@@ -234,7 +234,7 @@ func TestShapingNewlineHandling(t *testing.T) {
 func TestCacheEmptyString(t *testing.T) {
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	collection := []FontFace{{Face: ltrFace}}
-	cache := NewShaper(collection)
+	cache := NewShaper(NoSystemFonts(), WithCollection(collection))
 	cache.LayoutString(Parameters{
 		Alignment: Middle,
 		PxPerEm:   fixed.I(10),
@@ -273,7 +273,7 @@ func TestCacheEmptyString(t *testing.T) {
 func TestCacheAlignment(t *testing.T) {
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	collection := []FontFace{{Face: ltrFace}}
-	cache := NewShaper(collection)
+	cache := NewShaper(NoSystemFonts(), WithCollection(collection))
 	params := Parameters{
 		Alignment: Start,
 		PxPerEm:   fixed.I(10),
@@ -339,7 +339,7 @@ func TestCacheGlyphConverstion(t *testing.T) {
 		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
-			cache := NewShaper(collection)
+			cache := NewShaper(NoSystemFonts(), WithCollection(collection))
 			cache.LayoutString(Parameters{
 				PxPerEm:  fixed.I(10),
 				MaxWidth: 200,
@@ -481,7 +481,7 @@ func TestShapeStringRuneAccounting(t *testing.T) {
 				},
 			} {
 				t.Run(setup.kind, func(t *testing.T) {
-					shaper := NewShaper(gofont.Collection())
+					shaper := NewShaper(NoSystemFonts(), WithCollection(gofont.Collection()))
 					setup.do(shaper, tc.params, tc.input)
 
 					glyphs := []Glyph{}
diff --git a/widget/editor_test.go b/widget/editor_test.go
index 119f21ff..707b6080 100644
--- a/widget/editor_test.go
+++ b/widget/editor_test.go
@@ -108,7 +108,7 @@ func TestEditorReadOnly(t *testing.T) {
 			key.FocusEvent{Focus: true},
 		},
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	e := new(Editor)
@@ -187,7 +187,7 @@ func TestEditorConfigurations(t *testing.T) {
 		Constraints: layout.Exact(image.Pt(300, 300)),
 		Locale:      english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	sentence := "\n\n\n\n\n\n\n\n\n\n\n\nthe quick brown fox jumps over the lazy dog"
@@ -241,7 +241,7 @@ func TestEditor(t *testing.T) {
 		Constraints: layout.Exact(image.Pt(100, 100)),
 		Locale:      english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 
@@ -349,7 +349,7 @@ func TestEditorRTL(t *testing.T) {
 		Constraints: layout.Exact(image.Pt(100, 100)),
 		Locale:      arabic,
 	}
-	cache := text.NewShaper(arabicCollection)
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(arabicCollection))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 
@@ -419,14 +419,14 @@ func TestEditorLigature(t *testing.T) {
 	if err != nil {
 		t.Skipf("failed parsing test font: %v", err)
 	}
-	cache := text.NewShaper([]font.FontFace{
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection([]font.FontFace{
 		{
 			Font: font.Font{
 				Typeface: "Roboto",
 			},
 			Face: face,
 		},
-	})
+	}))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 
@@ -540,7 +540,7 @@ func TestEditorDimensions(t *testing.T) {
 		Queue:       tq,
 		Locale:      english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	dims := e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
@@ -587,7 +587,7 @@ func TestEditorCaretConsistency(t *testing.T) {
 		Constraints: layout.Exact(image.Pt(100, 100)),
 		Locale:      english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	for _, a := range []text.Alignment{text.Start, text.Middle, text.End} {
@@ -679,7 +679,7 @@ func TestEditorMoveWord(t *testing.T) {
 			Constraints: layout.Exact(image.Pt(100, 100)),
 			Locale:      english,
 		}
-		cache := text.NewShaper(gofont.Collection())
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 		fontSize := unit.Sp(10)
 		font := font.Font{}
 		e.SetText(t)
@@ -784,7 +784,7 @@ func TestEditorInsert(t *testing.T) {
 			Constraints: layout.Exact(image.Pt(100, 100)),
 			Locale:      english,
 		}
-		cache := text.NewShaper(gofont.Collection())
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 		fontSize := unit.Sp(10)
 		font := font.Font{}
 		e.SetText(t)
@@ -874,7 +874,7 @@ func TestEditorDeleteWord(t *testing.T) {
 			Constraints: layout.Exact(image.Pt(100, 100)),
 			Locale:      english,
 		}
-		cache := text.NewShaper(gofont.Collection())
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 		fontSize := unit.Sp(10)
 		font := font.Font{}
 		e.SetText(t)
@@ -928,7 +928,7 @@ g 2 4 6 8 g
 		Ops:    new(op.Ops),
 		Locale: english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	font := font.Font{}
 	fontSize := unit.Sp(10)
 
@@ -1026,7 +1026,7 @@ func TestSelectMove(t *testing.T) {
 		Ops:    new(op.Ops),
 		Locale: english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	font := font.Font{}
 	fontSize := unit.Sp(10)
 
@@ -1114,7 +1114,7 @@ func TestEditor_MaxLen(t *testing.T) {
 			key.SelectionEvent{Start: 4, End: 4},
 		),
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
@@ -1145,7 +1145,7 @@ func TestEditor_Filter(t *testing.T) {
 			key.SelectionEvent{Start: 4, End: 4},
 		),
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
@@ -1169,7 +1169,7 @@ func TestEditor_Submit(t *testing.T) {
 			key.EditEvent{Range: key.Range{Start: 0, End: 0}, Text: "ab1\n"},
 		),
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
diff --git a/widget/index_test.go b/widget/index_test.go
index ee86410a..7442245a 100644
--- a/widget/index_test.go
+++ b/widget/index_test.go
@@ -20,7 +20,7 @@ func makePosTestText(fontSize, lineWidth int, alignOpposite bool) (source string
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	rtlFace, _ := opentype.Parse(nsareg.TTF)
 
-	shaper := text.NewShaper([]font.FontFace{
+	shaper := text.NewShaper(text.NoSystemFonts(), text.WithCollection([]font.FontFace{
 		{
 			Font: font.Font{Typeface: "LTR"},
 			Face: ltrFace,
@@ -29,12 +29,11 @@ func makePosTestText(fontSize, lineWidth int, alignOpposite bool) (source string
 			Font: font.Font{Typeface: "RTL"},
 			Face: rtlFace,
 		},
-	})
+	}))
 	// bidiSource is crafted to contain multiple consecutive RTL runs (by
 	// changing scripts within the RTL).
 	bidiSource := "The quick سماء שלום لا fox تمط שלום غير the lazy dog."
 	ltrParams := text.Parameters{
-		Font:     font.Font{Typeface: "LTR"},
 		PxPerEm:  fixed.I(fontSize),
 		MaxWidth: lineWidth,
 		MinWidth: lineWidth,
@@ -42,7 +41,6 @@ func makePosTestText(fontSize, lineWidth int, alignOpposite bool) (source string
 	}
 	rtlParams := text.Parameters{
 		Alignment: text.End,
-		Font:      font.Font{Typeface: "RTL"},
 		PxPerEm:   fixed.I(fontSize),
 		MaxWidth:  lineWidth,
 		MinWidth:  lineWidth,
@@ -69,7 +67,7 @@ func makeAccountingTestText(str string, fontSize, lineWidth int) (txt []text.Gly
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	rtlFace, _ := opentype.Parse(nsareg.TTF)
 
-	shaper := text.NewShaper([]font.FontFace{{
+	shaper := text.NewShaper(text.NoSystemFonts(), text.WithCollection([]font.FontFace{{
 		Font: font.Font{Typeface: "LTR"},
 		Face: ltrFace,
 	},
@@ -77,7 +75,7 @@ func makeAccountingTestText(str string, fontSize, lineWidth int) (txt []text.Gly
 			Font: font.Font{Typeface: "RTL"},
 			Face: rtlFace,
 		},
-	})
+	}))
 	params := text.Parameters{
 		PxPerEm:  fixed.I(fontSize),
 		MaxWidth: lineWidth,
@@ -95,7 +93,7 @@ func getGlyphs(fontSize, minWidth, lineWidth int, align text.Alignment, str stri
 	ltrFace, _ := opentype.Parse(goregular.TTF)
 	rtlFace, _ := opentype.Parse(nsareg.TTF)
 
-	shaper := text.NewShaper([]font.FontFace{{
+	shaper := text.NewShaper(text.NoSystemFonts(), text.WithCollection([]font.FontFace{{
 		Font: font.Font{Typeface: "LTR"},
 		Face: ltrFace,
 	},
@@ -103,7 +101,7 @@ func getGlyphs(fontSize, minWidth, lineWidth int, align text.Alignment, str stri
 			Font: font.Font{Typeface: "RTL"},
 			Face: rtlFace,
 		},
-	})
+	}))
 	params := text.Parameters{
 		PxPerEm:   fixed.I(fontSize),
 		Alignment: align,
@@ -230,8 +228,11 @@ func TestIndexPositionBidi(t *testing.T) {
 			glyphs: bidiLTRText,
 			expectedXs: []fixed.Int26_6{
 				0, 626, 1196, 1766, 2051, 2621, 3191, 3444, 3956, 4468, 4753, 7133, 6330, 5738, 5440, 5019, 4753, // Positions on line 0.
+
 				3953, 3185, 2417, 1649, 881, 596, 298, 0, 3953, 4238, 4523, 5093, 5605, 5890, 7905, 7599, 7007, 6156, 5890, // Positions on line 1.
+
 				4660, 3892, 3124, 2356, 1588, 1303, 788, 406, 0, 4660, 4945, 5235, 5805, 6375, 6660, 6934, 7504, 8016, 8528, 8813, // Positions on line 2.
+
 				0, 570, 1140, 1710, 2034, // Positions on line 3.
 			},
 		},
@@ -239,9 +240,13 @@ func TestIndexPositionBidi(t *testing.T) {
 			name:   "bidi rtl",
 			glyphs: bidiRTLText,
 			expectedXs: []fixed.Int26_6{
-				5368, 5994, 6564, 7134, 7419, 7989, 8559, 8812, 9324, 9836, 5368, 5102, 4299, 3707, 3409, 2988, 2722, 2108, 1494, 880, 266, 0, // Positions on line 0.
-				8801, 8503, 8205, 7939, 6572, 6857, 7427, 7939, 6572, 6306, 6000, 5408, 4557, 4291, 3677, 3063, 2449, 1835, 1569, 1054, 672, 266, 0, // Positions on line 1.
-				274, 564, 1134, 1704, 1989, 2263, 2833, 3345, 3857, 4142, 4712, 5282, 5852, 274, 0, // Positions on line 2.
+				2665, 3291, 3861, 4431, 4716, 5286, 5856, 6109, 6621, 7133, 2665, 2380, 1577, 985, 687, 266, 0, // Positions on line 0.
+
+				7886, 7118, 6350, 5582, 4814, 4529, 4231, 3933, 3667, 2300, 2585, 3155, 3667, 2300, 2015, 1709, 1117, 266, 0, // Positions on line 1.
+
+				8794, 8026, 7258, 6490, 5722, 5437, 4922, 4540, 4134, 3868, 0, 290, 860, 1430, 1715, 1989, 2559, 3071, 3583, 3868, // Positions on line 2.
+
+				324, 894, 1464, 2034, 324, 0, // Positions on line 3.
 			},
 		},
 	} {
@@ -352,27 +357,35 @@ func TestIndexPositionLines(t *testing.T) {
 				{
 					xOff:    fixed.Int26_6(0),
 					yOff:    22,
-					glyphs:  20,
-					width:   fixed.Int26_6(9836),
+					glyphs:  15,
+					width:   fixed.Int26_6(7133),
 					ascent:  fixed.Int26_6(1407),
 					descent: fixed.Int26_6(756),
 				},
 				{
 					xOff:    fixed.Int26_6(0),
 					yOff:    41,
-					glyphs:  19,
-					width:   fixed.Int26_6(8801),
+					glyphs:  15,
+					width:   fixed.Int26_6(7886),
 					ascent:  fixed.Int26_6(1407),
 					descent: fixed.Int26_6(756),
 				},
 				{
 					xOff:    fixed.Int26_6(0),
 					yOff:    60,
-					glyphs:  13,
-					width:   fixed.Int26_6(5852),
+					glyphs:  18,
+					width:   fixed.Int26_6(8794),
 					ascent:  fixed.Int26_6(1407),
 					descent: fixed.Int26_6(756),
 				},
+				{
+					xOff:    fixed.Int26_6(0),
+					yOff:    80,
+					glyphs:  4,
+					width:   fixed.Int26_6(2034),
+					ascent:  fixed.Int26_6(968),
+					descent: fixed.Int26_6(216),
+				},
 			},
 		},
 		{
@@ -420,29 +433,37 @@ func TestIndexPositionLines(t *testing.T) {
 			glyphs: bidiRTLTextOpp,
 			expectedLines: []lineInfo{
 				{
-					xOff:    fixed.Int26_6(404),
+					xOff:    fixed.Int26_6(3107),
 					yOff:    22,
-					glyphs:  20,
-					width:   fixed.Int26_6(9836),
+					glyphs:  15,
+					width:   fixed.Int26_6(7133),
 					ascent:  fixed.Int26_6(1407),
 					descent: fixed.Int26_6(756),
 				},
 				{
-					xOff:    fixed.Int26_6(1439),
+					xOff:    fixed.Int26_6(2354),
 					yOff:    41,
-					glyphs:  19,
-					width:   fixed.Int26_6(8801),
+					glyphs:  15,
+					width:   fixed.Int26_6(7886),
 					ascent:  fixed.Int26_6(1407),
 					descent: fixed.Int26_6(756),
 				},
 				{
-					xOff:    fixed.Int26_6(4388),
+					xOff:    fixed.Int26_6(1446),
 					yOff:    60,
-					glyphs:  13,
-					width:   fixed.Int26_6(5852),
+					glyphs:  18,
+					width:   fixed.Int26_6(8794),
 					ascent:  fixed.Int26_6(1407),
 					descent: fixed.Int26_6(756),
 				},
+				{
+					xOff:    fixed.Int26_6(8206),
+					yOff:    80,
+					glyphs:  4,
+					width:   fixed.Int26_6(2034),
+					ascent:  fixed.Int26_6(968),
+					descent: fixed.Int26_6(216),
+				},
 			},
 		},
 	} {
diff --git a/widget/material/list_test.go b/widget/material/list_test.go
index a4fd370a..873e28d8 100644
--- a/widget/material/list_test.go
+++ b/widget/material/list_test.go
@@ -5,7 +5,6 @@ import (
 	"testing"
 	"time"
 
-	"gioui.org/font/gofont"
 	"gioui.org/io/system"
 	"gioui.org/layout"
 	"gioui.org/op"
@@ -45,7 +44,7 @@ func TestListAnchorStrategies(t *testing.T) {
 	var list widget.List
 	list.Axis = layout.Vertical
 	elements := 100
-	th := material.NewTheme(gofont.Collection())
+	th := material.NewTheme()
 	materialList := material.List(th, &list)
 	indicatorWidth := gtx.Dp(materialList.Width())
 
diff --git a/widget/material/theme.go b/widget/material/theme.go
index 3e641c61..42f31130 100644
--- a/widget/material/theme.go
+++ b/widget/material/theme.go
@@ -7,7 +7,6 @@ import (
 
 	"golang.org/x/exp/shiny/materialdesign/icons"
 
-	"gioui.org/font"
 	"gioui.org/text"
 	"gioui.org/unit"
 	"gioui.org/widget"
@@ -47,10 +46,9 @@ type Theme struct {
 	FingerSize unit.Dp
 }
 
-func NewTheme(fontCollection []font.FontFace) *Theme {
-	t := &Theme{
-		Shaper: text.NewShaper(fontCollection),
-	}
+// NewTheme constructs a theme (and underlying text shaper).
+func NewTheme() *Theme {
+	t := &Theme{Shaper: &text.Shaper{}}
 	t.Palette = Palette{
 		Fg:         rgb(0x000000),
 		Bg:         rgb(0xffffff),
diff --git a/widget/selectable_test.go b/widget/selectable_test.go
index 45978a6f..0e4d751a 100644
--- a/widget/selectable_test.go
+++ b/widget/selectable_test.go
@@ -37,7 +37,7 @@ func TestSelectableMove(t *testing.T) {
 		Ops:    new(op.Ops),
 		Locale: english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fnt := font.Font{}
 	fontSize := unit.Sp(10)
 
@@ -82,7 +82,7 @@ func TestSelectableConfigurations(t *testing.T) {
 		Constraints: layout.Exact(image.Pt(300, 300)),
 		Locale:      english,
 	}
-	cache := text.NewShaper(gofont.Collection())
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	sentence := "\n\n\n\n\n\n\n\n\n\n\n\nthe quick brown fox jumps over the lazy dog"
diff --git a/widget/text_bench_test.go b/widget/text_bench_test.go
index 17a0ed82..a0d8e855 100644
--- a/widget/text_bench_test.go
+++ b/widget/text_bench_test.go
@@ -86,7 +86,7 @@ func BenchmarkLabelStatic(b *testing.B) {
 			},
 			Locale: locale,
 		}
-		cache := text.NewShaper(benchFonts)
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(benchFonts))
 		if render {
 			win, _ = headless.NewWindow(size.X, size.Y)
 			defer win.Release()
@@ -118,7 +118,7 @@ func BenchmarkLabelDynamic(b *testing.B) {
 			},
 			Locale: locale,
 		}
-		cache := text.NewShaper(benchFonts)
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(benchFonts))
 		if render {
 			win, _ = headless.NewWindow(size.X, size.Y)
 			defer win.Release()
@@ -153,7 +153,7 @@ func BenchmarkEditorStatic(b *testing.B) {
 			},
 			Locale: locale,
 		}
-		cache := text.NewShaper(benchFonts)
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(benchFonts))
 		if render {
 			win, _ = headless.NewWindow(size.X, size.Y)
 			defer win.Release()
@@ -186,7 +186,7 @@ func BenchmarkEditorDynamic(b *testing.B) {
 			},
 			Locale: locale,
 		}
-		cache := text.NewShaper(benchFonts)
+		cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(benchFonts))
 		if render {
 			win, _ = headless.NewWindow(size.X, size.Y)
 			defer win.Release()
@@ -224,7 +224,7 @@ func FuzzEditorEditing(f *testing.F) {
 		},
 		Locale: arabic,
 	}
-	cache := text.NewShaper(benchFonts)
+	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(benchFonts))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
 	e := Editor{}