PDF copy/past text from Acrobat Reader store unicode id in clipboard

[Nohbo]

Hi,
Thank you for creating this package!

I have a problem when I use Acrobat Reader on Windows (no problem with Firefox or XpdfReader), the copied text becomes unreadable and displays unicodes : 􀀁􀀂􀀃􀀄􀀅􀀃􀀄􀀅􀀁􀀂􀀃􀀁
Probably something to do with Cmap, but that's outside my field of knowledge…

I use canvas.RichText to create text.

File: doc.pdf

Thank you !

[tdewolff]

Are you sure you used canvas and used the latest version to generate this PDF? The unique tag at the start of the file is different than what canvas generates.

EDIT: I did find a possible bug that trips up some readers, maybe that fixes it for you?

[Nohbo]

The PDF file sent may have been altered by an optimisation programme.
Here is the PDF directly from Canvas: file.pdf
The build is indeed the latest: 19559a9.

I've tested the Barlow and DejaVu fonts, with and without the subset option, on two Windows, and the problem persists.

[tdewolff]

That is still not a PDF from Canvas!

However, there may be a bug in the CIDToGID array which is invalid for embedded CFF fonts. However, the DejaVu fonts ares TrueType fonts if I remember correctly, so this may not be it. Furthermore, I'm getting Syntax Warning: Mismatch between font type and embedded font file when using Linux tools, so this may also be an indication.

[tdewolff]

I've added a change that removes the warnings for a mismatch of type and font file. Maybe this works for you now? Can you try with both a TTF and a CFF font? In this repository there is an example CFF font in resources/EBGaramond12-Regular.otf (.ttf is always TrueType, but .otf may be either).

[Nohbo]

Problem not solved. I tested both types of font, TTF and OTF.
Version: c15dfee
PDF: file.pdf
Code:

package main

import (
	"log"
	"os"
	"path/filepath"

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

	"github.com/tdewolff/canvas"
)

func main() {

	dir, err := os.Getwd()
	if err != nil {
		log.Println(err)
	}

	path := filepath.Join(dir, "file.pdf")

	println(path)

	f, err := os.Create(path)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	doc := pdf.New(f, 210, 297, &pdf.Options{
		Compress:    false,
		SubsetFonts: true,
	})

	ctx := canvas.NewContext(doc)
	ctx.SetCoordSystem(canvas.CartesianIV)
	ctx.SetFillColor(canvas.Black)

	barlow := canvas.NewFontFamily("Barlow")
	garamond := canvas.NewFontFamily("EBGaramond12")

	barlowRegularPath := filepath.Join(dir, "assets/Barlow-Regular.ttf")
	if err := barlow.LoadFontFile(barlowRegularPath, canvas.FontRegular); err != nil {
		panic(err)
	}

	barlowBoldPath := filepath.Join(dir, "assets/Barlow-Bold.ttf")
	if err := barlow.LoadFontFile(barlowBoldPath, canvas.FontBold); err != nil {
		panic(err)
	}

	garamondBPath := filepath.Join(dir, "assets/EBGaramond12-Regular.otf")
	if err := garamond.LoadFontFile(garamondBPath, canvas.FontBold); err != nil {
		panic(err)
	}

	barlowRegular := barlow.Face(9.0, canvas.FontRegular, canvas.FontNormal, canvas.RGBA(0, 0, 0, 1.0))
	barlowBold := barlow.Face(9.0, canvas.FontBold, canvas.FontNormal, canvas.RGBA(0, 0, 0, 1.0))
	garamondRegular := garamond.Face(9.0, canvas.FontRegular, canvas.FontNormal, canvas.RGBA(0, 0, 0, 1.0))

	richTextTTF := canvas.NewRichText(barlowRegular)
	richTextTTF.WriteString("This is ")
	richTextTTF.WriteFace(barlowBold, "TTF")

	richTextOTF := canvas.NewRichText(garamondRegular)
	richTextOTF.WriteString("This is OTF")

	ctx.DrawText(25, 25, richTextTTF.ToText(160, 25, canvas.Left, canvas.Top, 0, 0))
	ctx.DrawText(25, 50, richTextOTF.ToText(160, 25, canvas.Left, canvas.Top, 0, 0))
	doc.Close()
}

I don't know if this is a source that can help, but there was a similar problem for a javascript package: Hopding/pdf-lib#245

[tdewolff]

There was a bug in CMap generation, thanks for the link! Can you please try again? I can't reproduce locally, even Chrome always copied text fine.

[Nohbo]

It works great! Thank you very much for your nice work!
file.pdf

[tdewolff]

Thank you for raising this issue and helping debug this on Windows!