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text/v2: add copyCheck to GoTextFaceSource

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This commit is contained in:
Hajime Hoshi 2023-11-19 23:15:18 +09:00
parent d2d86fbddd
commit 7a08737326
1 changed files with 12 additions and 0 deletions
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12
text/v2/gotextfacesource.go
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@ -58,6 +58,8 @@ type GoTextFaceSource struct {
outputCache map[goTextOutputCacheKey]*goTextOutputCacheValue outputCache map[goTextOutputCacheKey]*goTextOutputCacheValue
addr *GoTextFaceSource
m sync.Mutex m sync.Mutex
} }
@ -95,6 +97,7 @@ func NewGoTextFaceSource(source io.ReadSeeker) (*GoTextFaceSource, error) {
f: f, f: f,
id: nextUniqueID(), id: nextUniqueID(),
} }
s.addr = s
runtime.SetFinalizer(s, finalizeGoTextFaceSource) runtime.SetFinalizer(s, finalizeGoTextFaceSource)
return s, nil return s, nil
} }
@ -117,6 +120,7 @@ func NewGoTextFaceSourcesFromCollection(source io.ReadSeeker) ([]*GoTextFaceSour
f: f, f: f,
id: nextUniqueID(), id: nextUniqueID(),
} }
s.addr = s
runtime.SetFinalizer(s, finalizeGoTextFaceSource) runtime.SetFinalizer(s, finalizeGoTextFaceSource)
sources[i] = s sources[i] = s
} }
@ -130,7 +134,15 @@ func finalizeGoTextFaceSource(source *GoTextFaceSource) {
}) })
} }
func (g *GoTextFaceSource) copyCheck() {
if g.addr != g {
panic("text: illegal use of non-zero GoTextFaceSource copied by value")
}
}
func (g *GoTextFaceSource) shape(text string, face *GoTextFace) (shaping.Output, []glyph) { func (g *GoTextFaceSource) shape(text string, face *GoTextFace) (shaping.Output, []glyph) {
g.copyCheck()
g.m.Lock() g.m.Lock()
defer g.m.Unlock() defer g.m.Unlock()