45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
package draw2dbase
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import "github.com/llgcode/draw2d"
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var (
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DefaultGlyphCache = &defaultGlyphCache{make(map[string]map[rune]*draw2d.Glyph)}
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)
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type defaultGlyphCache struct {
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glyphMap map[string]map[rune]*draw2d.Glyph
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}
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// Fetch fetches a glyph from the cache, storing with Render first if it doesn't already exist
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func (cache *defaultGlyphCache) Fetch(gc draw2d.GraphicContext, fontName string, chr rune) *draw2d.Glyph {
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if cache.glyphMap[fontName] == nil {
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cache.glyphMap[fontName] = make(map[rune]*draw2d.Glyph, 60)
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}
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if cache.glyphMap[fontName][chr] == nil {
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cache.glyphMap[fontName][chr] = cache.Render(gc, fontName, chr)
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}
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return cache.glyphMap[fontName][chr].Copy()
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}
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// Render renders a glyph then returns it
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func (cache *defaultGlyphCache) Render(gc draw2d.GraphicContext, fontName string, chr rune) *draw2d.Glyph {
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gc.Save()
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defer gc.Restore()
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gc.BeginPath()
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width := gc.CreateStringPath(string(chr), 0, 0)
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path := gc.GetPath()
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return &draw2d.Glyph{
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Path: &path,
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Width: width,
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}
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}
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// FetchGlyph fetches a glyph from the cache, calling renderGlyph first if it doesn't already exist
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func FetchGlyph(gc draw2d.GraphicContext, fontName string, chr rune) *draw2d.Glyph {
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return gc.GetGlyphCache().Fetch(gc, fontName, chr)
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}
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// renderGlyph renders a glyph then caches and returns it
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func renderGlyph(gc draw2d.GraphicContext, fontName string, chr rune) *draw2d.Glyph {
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return gc.GetGlyphCache().Render(gc, fontName, chr)
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}
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