From 9941d7746001563417ca26eee03488fb0918df7e Mon Sep 17 00:00:00 2001
From: Hamcha <zikyky@gmail.com>
Date: Fri, 16 Nov 2018 15:19:48 +0100
Subject: [PATCH] Add emojis to bound calculation

---
 draw2dimg/ftgc.go | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/draw2dimg/ftgc.go b/draw2dimg/ftgc.go
index 141ac63..5482a23 100644
--- a/draw2dimg/ftgc.go
+++ b/draw2dimg/ftgc.go
@@ -179,12 +179,25 @@ func (gc *GraphicContext) StrokeStringAt(text string, x, y float64) (width float
 	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.Stroke(gc, x, y)
 		prev, hasPrev = index, true
 	}
@@ -262,8 +275,12 @@ func (gc *GraphicContext) GetStringBounds(s string) (left, top, right, bottom fl
 	top, left, bottom, right = 10e6, 10e6, -10e6, -10e6
 	cursor := 0.0
 	prev, hasPrev := truetype.Index(0), false
-	for _, rune := range s {
-		index := f.Index(rune)
+	for fragment := range gc.Emojis.Iterate(s) {
+		if fragment.IsEmoji {
+			cursor += gc.Current.Scale*emojiScale + gc.Current.Scale*emojiSpacing*2
+			continue
+		}
+		index := f.Index(fragment.Rune)
 		if hasPrev {
 			cursor += fUnitsToFloat64(f.Kern(fixed.Int26_6(gc.Current.Scale), prev, index))
 		}