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text,widget/material: make font collections explicit
Before this change, package font implemented a global font registry, with the usual problems of package global state. This change deletes the global registry and introduces the text.Collection type for representing a list of fonts and their faces. Collection exports Lookup that finds the closest match and its face. The existing FontRegistry is renamed to Cache to reflect its new limited functionality: a cache of shapes and measurements on top of a Collection. Then, material.NewTheme is changed to take a Collection and initialize a Cache. Updates gio#19 because multiple windows require a separate (writable) Cache per window, while (read-only) Collections may be shared. Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
+80
-56
@@ -28,94 +28,118 @@ type Shaper interface {
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Metrics(font Font, size fixed.Int26_6) font.Metrics
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}
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// FontRegistry implements layout and shaping of text from a set of
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// Collection maps Fonts to Faces.
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type Collection struct {
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def Typeface
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faces map[Font]Face
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}
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// Cache implements cached layout and shaping of text from a set of
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// registered fonts.
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//
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// If a font matches no registered shape, FontRegistry falls back to the
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// If a font matches no registered shape, Cache falls back to the
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// first registered face.
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//
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// The LayoutString and ShapeString results are cached and re-used if
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// possible.
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type FontRegistry struct {
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def Typeface
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faces map[Font]*face
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type Cache struct {
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col *Collection
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faces map[Font]*faceCache
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}
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type face struct {
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face Face
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type faceCache struct {
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layoutCache layoutCache
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pathCache pathCache
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}
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func (s *FontRegistry) Register(font Font, tf Face) {
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if s.faces == nil {
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s.def = font.Typeface
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s.faces = make(map[Font]*face)
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func (c *Collection) Register(font Font, tf Face) {
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if c.faces == nil {
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c.def = font.Typeface
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c.faces = make(map[Font]Face)
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}
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if font.Weight == 0 {
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font.Weight = Normal
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}
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s.faces[font] = &face{
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face: tf,
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c.faces[font] = tf
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}
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// Lookup a font and return the effective font and its
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// font face.
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func (c *Collection) Lookup(font Font) (Font, Face) {
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var f Face
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font, f = c.faceForStyle(font)
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if f == nil {
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font.Typeface = c.def
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font, f = c.faceForStyle(font)
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}
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return font, f
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}
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func (s *FontRegistry) Layout(font Font, size fixed.Int26_6, maxWidth int, txt io.Reader) ([]Line, error) {
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tf := s.faceForFont(font)
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return tf.face.Layout(size, maxWidth, txt)
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}
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func (s *FontRegistry) Shape(font Font, size fixed.Int26_6, layout []Glyph) op.CallOp {
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tf := s.faceForFont(font)
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return tf.face.Shape(size, layout)
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}
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func (s *FontRegistry) LayoutString(font Font, size fixed.Int26_6, maxWidth int, str string) []Line {
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tf := s.faceForFont(font)
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return tf.layout(size, maxWidth, str)
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}
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func (s *FontRegistry) ShapeString(font Font, size fixed.Int26_6, str string, layout []Glyph) op.CallOp {
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tf := s.faceForFont(font)
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return tf.shape(size, str, layout)
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}
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func (s *FontRegistry) Metrics(font Font, size fixed.Int26_6) font.Metrics {
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tf := s.faceForFont(font)
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return tf.metrics(size)
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}
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func (s *FontRegistry) faceForStyle(font Font) *face {
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tf := s.faces[font]
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func (c *Collection) faceForStyle(font Font) (Font, Face) {
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tf := c.faces[font]
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if tf == nil {
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font := font
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font.Weight = Normal
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tf = s.faces[font]
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tf = c.faces[font]
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}
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if tf == nil {
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font := font
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font.Style = Regular
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tf = s.faces[font]
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tf = c.faces[font]
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}
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if tf == nil {
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font := font
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font.Style = Regular
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font.Weight = Normal
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tf = s.faces[font]
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tf = c.faces[font]
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}
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return tf
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return font, tf
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}
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func (s *FontRegistry) faceForFont(font Font) *face {
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tf := s.faceForStyle(font)
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if tf == nil {
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font.Typeface = s.def
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tf = s.faceForStyle(font)
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func NewCache(fonts *Collection) *Cache {
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return &Cache{
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col: fonts,
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faces: make(map[Font]*faceCache),
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}
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return tf
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}
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func (t *face) layout(ppem fixed.Int26_6, maxWidth int, str string) []Line {
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func (s *Cache) Layout(font Font, size fixed.Int26_6, maxWidth int, txt io.Reader) ([]Line, error) {
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_, face := s.faceForFont(font)
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return face.Layout(size, maxWidth, txt)
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}
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func (s *Cache) Shape(font Font, size fixed.Int26_6, layout []Glyph) op.CallOp {
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_, face := s.faceForFont(font)
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return face.Shape(size, layout)
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}
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func (s *Cache) LayoutString(font Font, size fixed.Int26_6, maxWidth int, str string) []Line {
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cache, face := s.faceForFont(font)
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return cache.layout(face, size, maxWidth, str)
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}
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func (s *Cache) ShapeString(font Font, size fixed.Int26_6, str string, layout []Glyph) op.CallOp {
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cache, face := s.faceForFont(font)
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return cache.shape(face, size, str, layout)
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}
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func (s *Cache) Metrics(font Font, size fixed.Int26_6) font.Metrics {
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cache, face := s.faceForFont(font)
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return cache.metrics(face, size)
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}
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func (s *Cache) faceForFont(font Font) (*faceCache, Face) {
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var f Face
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font, f = s.col.Lookup(font)
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cache, exists := s.faces[font]
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if !exists {
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cache = new(faceCache)
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s.faces[font] = cache
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}
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return cache, f
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}
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func (t *faceCache) layout(face Face, ppem fixed.Int26_6, maxWidth int, str string) []Line {
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if t == nil {
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return nil
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}
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@@ -127,12 +151,12 @@ func (t *face) layout(ppem fixed.Int26_6, maxWidth int, str string) []Line {
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if l, ok := t.layoutCache.Get(lk); ok {
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return l
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}
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l, _ := t.face.Layout(ppem, maxWidth, strings.NewReader(str))
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l, _ := face.Layout(ppem, maxWidth, strings.NewReader(str))
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t.layoutCache.Put(lk, l)
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return l
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}
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func (t *face) shape(ppem fixed.Int26_6, str string, layout []Glyph) op.CallOp {
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func (t *faceCache) shape(face Face, ppem fixed.Int26_6, str string, layout []Glyph) op.CallOp {
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if t == nil {
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return op.CallOp{}
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}
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@@ -143,11 +167,11 @@ func (t *face) shape(ppem fixed.Int26_6, str string, layout []Glyph) op.CallOp {
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if clip, ok := t.pathCache.Get(pk); ok {
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return clip
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}
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clip := t.face.Shape(ppem, layout)
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clip := face.Shape(ppem, layout)
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t.pathCache.Put(pk, clip)
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return clip
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}
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func (t *face) metrics(ppem fixed.Int26_6) font.Metrics {
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return t.face.Metrics(ppem)
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func (t *faceCache) metrics(face Face, ppem fixed.Int26_6) font.Metrics {
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return face.Metrics(ppem)
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}
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