fixed dependencies

vendor/github.com/go-latex/latex/mtex/render.go

@@ -0,0 +1,50 @@
+// Copyright ©2020 The go-latex Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mtex
+
+import (
+	"fmt"
+	"math"
+
+	"github.com/go-latex/latex/drawtex"
+	"github.com/go-latex/latex/font/ttf"
+	"github.com/go-latex/latex/tex"
+)
+
+type Renderer interface {
+	Render(w, h, dpi float64, cnv *drawtex.Canvas) error
+}
+
+func Render(dst Renderer, expr string, size, dpi float64, fonts *ttf.Fonts) error {
+	var (
+		canvas  = drawtex.New()
+		backend *ttf.Backend
+	)
+	switch fonts {
+	case nil:
+		backend = ttf.New(canvas)
+	default:
+		backend = ttf.NewFrom(canvas, fonts)
+	}
+
+	box, err := Parse(expr, size, 72, backend)
+	if err != nil {
+		return fmt.Errorf("could not parse math expression: %w", err)
+	}
+
+	var sh tex.Ship
+	sh.Call(0, 0, box.(tex.Tree))
+
+	w := box.Width()
+	h := box.Height()
+	d := box.Depth()
+
+	err = dst.Render(w/72, math.Ceil(h+math.Max(d, 0))/72, dpi, canvas)
+	if err != nil {
+		return fmt.Errorf("could not render math expression: %w", err)
+	}
+
+	return nil
+}