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Font drawing in linux [message #33014]

Thu, 30 June 2011 13:10

Zbych
Messages: 327
Registered: July 2009

Senior Member

Hi,

I am writing an application that shows information on small (44x16 pixel) LED display. The problem is that ttf fonts in NOGTK version of UPP look worse that in GTK. I thought that font rendering is the same in GTK and NOGTK version. Any ideas how to correct font drawing?

Test code:

#include <CtrlLib/CtrlLib.h>
#include <Draw/Draw.h>

using namespace Upp;

GUI_APP_MAIN
{
	Size sz(55,24);
	Font fnt(Font::FindFaceNameIndex("Impact"), 14);
	fnt.NonAntiAliased();
	ImageDraw id(sz);
	id.DrawRect(0, 0, sz.cx, sz.cy, Black());
	id.DrawText(0, -4, "PO LINE1", fnt, White());
	id.DrawText(0, 8, "PO LINE2", fnt, White());
	PNGEncoder png;
	png.SaveFile("FontTest.png", Image(id));
}

Attachment: zrzut_ekranu.png
(Size: 5.89KB, Downloaded 1047 times)

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Re: Font drawing in linux [message #33015 is a reply to message #33014]

Thu, 30 June 2011 15:06

dolik.rce
Messages: 1789
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi Zbych,

Wild guess before someone competent answers: Have you tried using Painter? It generally creates much nicer images than Draw. Also, you might try rendering a bigger image and then scaling it down. Of course, this doesn't answer the question why there is a difference between NOGTK and regular...

Anyway, it sounds like an interesting project Wink

Best regards,
Honza

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Re: Font drawing in linux [message #33016 is a reply to message #33015]

Thu, 30 June 2011 16:04

Zbych
Messages: 327
Registered: July 2009

Senior Member

With painter it looks great. How can I turn off antialiasing?

index.php?t=getfile&id=3336&private=0

Ok. I've found how to turnoff AA. MODE_NOAA must be added to ImagePainter initialization. But IMHO it's a pity that ImagePainter doesn't respect font properties (NonAntiAliased flag) like ImageDraw does.

Attachment: zrzut_ekranu.png
(Size: 2.61KB, Downloaded 960 times)

[Updated on: Thu, 30 June 2011 17:06]

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Re: Font drawing in linux [message #33017 is a reply to message #33014]

Thu, 30 June 2011 20:17

mr_ped
Messages: 825
Registered: November 2005
Location: Czech Republic - Praha

Experienced Contributor

I think ImageDraw does use OS API to draw fonts whenever possible, which looks to be in both GTK and NOGTK case of your test.

Painter is complete SW renderer from U++, so it is not affected by OS libraries, but on the other hand the level of features supported like using all the info out of font is limited.

With Painter you can anytime jump into the source, and suggest patches to improve it or just bend it for your custom needs. Smile

With classic ImageDraw you can just take it or leave it, the code is inside OS, not U++. (maybe you can patch slightly the way how OS font rendering is called)

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