[pdf] Wrong glyph displayed on iOS and Adobe Reader (fine for other font)

[oliverpool]

I generated the following pdf by running this program:
bug.pdf

package main

import (
	"image/color"
	"os"

	"github.com/tdewolff/canvas"
	"github.com/tdewolff/canvas/pdf"
)

func fontOTF() *canvas.FontFamily {
	fontFamily := canvas.NewFontFamily("SourceSerifPro")
	fontFamily.Use(canvas.CommonLigatures)
	err := fontFamily.LoadFontFile("SourceSerifPro-Regular.otf", canvas.FontRegular)
	if err != nil {
		panic(err)
	}
	return fontFamily
}

func fontDejaVuTTF() *canvas.FontFamily {
	fontFamily := canvas.NewFontFamily("times")
	fontFamily.Use(canvas.CommonLigatures)
	if err := fontFamily.LoadLocalFont("NimbusRoman-Regular", canvas.FontRegular); err != nil {
		panic(err)
	}
	return fontFamily
}

func main() {
	f, err := os.Create("bug.pdf")
	if err != nil {
		panic(nil)
	}
	defer f.Close()
	pdf := pdf.New(f, 100, 100)

	////////////////
	face := fontOTF().Face(16, color.Black, canvas.FontRegular, canvas.FontNormal)
	txt := canvas.NewTextLine(face, "SourceSerifPro-Regular.otf\nL (big l) is like I (big i) on iOS (/ is like [)", canvas.Left)
	pdf.RenderText(txt, canvas.Identity.Translate(0, 50))
	////////////////
	face = fontDejaVuTTF().Face(16, color.Black, canvas.FontRegular, canvas.FontNormal)
	txt = canvas.NewTextLine(face, "NimbusRoman-Regular\nL (big l) is like I (big i) on iOS (/ is like [)", canvas.Left)
	pdf.RenderText(txt, canvas.Identity.Translate(0, 20))

	err = pdf.Close()
	if err != nil {
		panic(nil)
	}
}

(you can get the OTF font at https://github.com/adobe-fonts/source-serif-pro)

It produces the following pdf:
bug.pdf

It displays fine on all PDF reader that I could test on linux (evince, firefox, chromium), but on the first line is wrong on Adobe Reader and iOS: the L is displayed like a I (the other letters look ok)

Do you have any idea what might be wrong ? (or at least in which direction should I search?)

[tdewolff]

Pretty sure this has to do with #60 where we use the wrong encoding. It might also be related to the fact that copying text from the PDF gives garbage...

[tdewolff]

This should be fixed in the develop branch, see the roadmap for more information: #74