This is a small demonstration program I put together to understand how to use stb_truetype.h. It creates a window and renders the text parameter to the window based on the parameters specified.

• make
• gcc
• sdl2
• doxygen (For documentation generation)

This is developed for Linux and no effort has been made to support it elsewhere. That said, with the exception of main.c using getopt.h for arg parsing and time.h for nanosleep(), I think the rest of the code should compile with little to no issue on other platforms. I would expect this to build on OSX with little issue.

There are four targets in the Makefile:

• clean
• debug
• release
• docs

The default target is release. release builds gstxt at release/gstxt. debug builds gstxt at debug/gsxtxt. docs builds the documentation with Doxygen.

There is help built into the program. Invoke the program with -h or --help:

debug/gstxt -h
Usage: gstxt text [OPTIONS] ttf_file

Renders text on screen in software.

OPTIONS:
    --help|-h:   Show this help text
    --width|-w:  Screen width (defaults to 600)
    --height|-v: Screen height (defaults to 300)
    --x:         Text x position (defaults to 20)
    --y:         Text y position (defaults to 150)
    --scale|-s:  Scale of text (defaults to 40)
    --fg|-f:     Foreground color as a 32-bit hexadecimal RGBA value (defaults to 0x000000FF)
    --bg|-b:     Background color as a 32-bit hexadecimal RGBA value (defaults to 0xFFFFFFFF)

Here's a sample invocation that changes several attributes of the resulting image:

debug/gstxt "a quick brown fox jumped" /usr/share/fonts/truetype/noto/NotoMono-Regular.ttf -f 0xFF00FFFF -b 0x000000ff -v 150 -y 50 -s 80 -w 1000

ESC quits the program, as does closing the window.