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draw2d
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Add emoji support

This commit is contained in:
Hamcha 2018-11-16 12:21:26 +01:00
parent 219501b99b
commit e3566f7fc4
Signed by: hamcha
GPG Key ID: A40413D21021EAEE
1 changed files with 22 additions and 4 deletions
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26
draw2dimg/ftgc.go
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@ -35,10 +35,11 @@ type GraphicContext struct {
painter Painter
fillRasterizer *raster.Rasterizer
strokeRasterizer *raster.Rasterizer
FontCache draw2d.FontCache
FontCache draw2d.FontCache
glyphCache draw2dbase.GlyphCache
glyphBuf *truetype.GlyphBuf
DPI int
Emojis emoji.Table
}
// ImageFilter defines the type of filter to use
@ -79,6 +80,7 @@ func NewGraphicContextWithPainter(img draw.Image, painter Painter) *GraphicConte
draw2dbase.NewGlyphCache(),
&truetype.GlyphBuf{},
dpi,
make(emoji.Table),
}
return gc
}
@ -124,6 +126,9 @@ func (gc *GraphicContext) FillString(text string) (width float64) {
return gc.FillStringAt(text, 0, 0)
}
const emojiSpacing = 10
const emojiScale = 110
// FillStringAt draws the text at the specified point (x, y)
func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64) {
f, err := gc.loadCurrentFont()
@ -134,12 +139,25 @@ func (gc *GraphicContext) FillStringAt(text string, x, y float64) (width float64
startx := x
prev, hasPrev := truetype.Index(0), false
fontName := gc.GetFontName()
for _, r := range text {
index := f.Index(r)
for fragment := range gc.Emojis.Iterate(text) {
if fragment.IsEmoji {
img, err := LoadFromPngFile(fragment.Emoji.Path)
if err == nil {
gc.Save()
scale := gc.GetFontSize() / 100
gc.Translate(x+scale*emojiSpacing, y-scale*emojiScale)
gc.Scale(scale, scale)
gc.DrawImage(img)
gc.Restore()
x += scale*float64(img.Bounds().Size().X) + scale*emojiSpacing*2
}
continue
}
index := f.Index(fragment.Rune)
if hasPrev {
x += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
}
glyph := gc.glyphCache.Fetch(gc, fontName, r)
glyph := gc.glyphCache.Fetch(gc, fontName, fragment.Rune)
x += glyph.Fill(gc, x, y)
prev, hasPrev = index, true
}