Can't load font with glyphs. #353

ShaiAvr · 2023-10-12T15:20:15Z

I am new to ImGui and I am trying to make a log window that shows the log messages I receive in the console:

As you can see, the log messages contain emojis and I'd like to display them too. Right now, It shows them as question marks:

I tried searching online and from this documentation of ImGui and this documentation of pyimgui it seems that I need to load a custom font with glyph ranges.

Loading a simple font with io.font.add_font_from_file_ttf(font, 16) works just fine, but when I try to add glyphs with io.fonts.get_glyph_ranges_chinese() or something similar, it just crashes and I don't understand why.

I am using pygame as a backend (pygame-ce actually). Here's the sample code I tried to use:

from imgui.integrations.pygame import PygameRenderer
import imgui
import moderngl as mgl
import pygame


def main():
    pygame.init()
    pygame.display.gl_set_attribute(
        pygame.GL_CONTEXT_PROFILE_MASK, pygame.GL_CONTEXT_PROFILE_CORE
    )
    size = 1600, 900

    pygame.display.set_mode(size, pygame.DOUBLEBUF | pygame.OPENGL)

    ctx = mgl.create_context(require=330)
    context = imgui.create_context()
    impl = PygameRenderer()
    clock = pygame.time.Clock()

    io = imgui.get_io()
    io.display_size = size

    f = io.fonts.add_font_from_file_ttf(
        r"C:\Windows\Fonts\calibri.ttf",  # Just a sample font
        16,
        io.fonts.get_glyph_ranges_chinese(),  # Adding this causes ImGui to crash!
    )
    impl.refresh_font_texture()

    show_custom_window = True

    # Note the emoji at the end
    example_msg = "12.10.2023 18:00:35.464 | INFO       ℹ️ |"

    running = True
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False
            impl.process_event(event)
        impl.process_inputs()

        imgui.new_frame()

        if imgui.begin_main_menu_bar():
            if imgui.begin_menu("File", True):
                clicked_quit, selected_quit = imgui.menu_item(
                    "Quit", "Ctrl+Q", False, True
                )

                if clicked_quit:
                    running = False

                imgui.end_menu()
            imgui.end_main_menu_bar()

        imgui.show_test_window()

        if show_custom_window:
            is_expand, show_custom_window = imgui.begin("Custom window", True)
            if is_expand:
                imgui.text(example_msg)  # Doesn't work with normal font
                with imgui.font(f):  # Doesn't work without the third argument which I can't get to work
                    imgui.text(example_msg)
            imgui.end()

        ctx.clear(0.08, 0.16, 0.18)
        imgui.render()
        impl.render(imgui.get_draw_data())

        pygame.display.flip()
        clock.tick(60)
    impl.shutdown()
    imgui.destroy_context(context)
    ctx.release()
    pygame.quit()


if __name__ == "__main__":
    main()

I don't understand why adding io.fonts.get_glyph_ranges_chinese() causes it to crash because it seems to be the correct way to add glyph ranges. What am I missing here? How can I fix this code to render emojis correctly?

The text was updated successfully, but these errors were encountered:

learn-more · 2023-10-16T08:58:44Z

Are there any relevant details in the crash?
Is it a python exception or a straight-out process going down crash?

ShaiAvr · 2023-10-16T09:58:52Z

@learn-more It's an ImGuiError. Here's the traceback:

It seems to come from the C++ code. Other than that, I can't really understand anything from this error.

pyimgui/pyimgui#353

RainbowUnicorn7297 added a commit to RainbowUnicorn7297/mltd-relive that referenced this issue Oct 16, 2023

Revert breaking changes from pyimgui 2.0.0

91b4547

pyimgui/pyimgui#353

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Can't load font with glyphs. #353

Can't load font with glyphs. #353

Can't load font with glyphs. #353

Can't load font with glyphs. #353

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