Custom font not properly loaded with auto renderer

[PFGimenez]

That's me again

Problem

When I load a custom non-square font with the auto renderer (GLSL), the font is not properly loaded. In this example, I try to print "Hello World!". It works fine with the SDL renderer.

What I expect (obtained with the SDL renderer):

What I see with the auto renderer (again, the yellow border is drawn by my OS):

Minimal example code

import time

import tcod

# Setup the font.
tcod.console_set_custom_font(
    'Andux_cp866ish.png',
    tcod.FONT_LAYOUT_ASCII_INROW,
    )

# Initialize the root console in a context.
with tcod.console_init_root(20, 10, 'title') as root_console:
    root_console.print_(x=0, y=0, string='Hello World!')
    tcod.console_flush() # Show the console.
    time.sleep(3) # Wait 3 seconds.
# The window is closed here, after the above context exits.

Configuration

I use python 3.7.2+, python-tcod 8.3.2 and SDL 2.0.9 on Debian testing. I got the same problem with another computer (Ubuntu 18.04) with SDL 2.0.8.

Resource

The custom font can be downloaded here: http://dwarffortresswiki.org/images/4/4a/Andux_cp866ish.png

[HexDecimal]

Does this issue persist if you change the flags to tcod.FONT_LAYOUT_ASCII_INROW | tcod.FONT_TYPE_GREYSCALE?

[PFGimenez]

I'm afk at the moment, I can test in about one hour.

[PFGimenez]

This is the result with tcod.FONT_LAYOUT_ASCII_INROW | tcod.FONT_TYPE_GREYSCALE:

(it's completely black)

[HexDecimal]

The magic pink background could mess up the font loader, anything other than white on black is ambiguous. Here's a version with a black background:

[PFGimenez]

It works ! Thank you. Is it normal that the pink version worked with the libtcod version of http://rogueliketutorials.com ?

[HexDecimal]

I'm not sure, maybe?

There are two font loaders in libtcod: the original one for the SDL, OPENGL, and GLSL renderers; and the one made by me for the SDL2 and OPENGL2 renderers.

When I tested the font with SDL, OPENGL, and GLSL I got three different results.

My font loader ignores the FONT_TYPE_GREYSCALE flag and individually converts greyscale glyphs to white-with-alpha, but assumes any glyph with colors will provide its own alpha. As expected the font loads as white on pink glyphs multiplied by the foreground color with this loader.

[PFGimenez]

If the problem comes from the font I used, I guess you can close this issue.

[HexDecimal]

I was confused about the tileset format for a little while but it looks like it's just using magic pink as a key-color. I could eventually add automatic support for this in the new font loader.

[PFGimenez]

I noticed that libtcod guesses automatically the key color using the space (' ') character, if it can help you : https://github.com/libtcod/libtcod/blob/master/src/libtcod/sys_sdl_c.cpp#L330

[HexDecimal]

You can now use those tilesets as-is in the latest versions of python-tcod and libtcod, as long as it's using one of the newer renderers.