Ideas or hints to implement custom image loading in imgui_sw?

Hi,
i modified the original source code of this software renderer for imgui to run in the recent stable version of Dear ImGui and using the Allegro 4.2.2 for a retro project, the repository README claims the code can't load textures that are not the font textures from ImGUI, there's a way to implement those?, basically i'm lost.

**P.D:** This code was compared with sronsse code, using both Allegro 4.2.2, sronsse runs slightly faster but it has visual glitches or limitations when using color wheels or gradient pickers where this code excels at.

*Fun Fact:* i ran this code in MS-DOS, in a real retro machine a Pentium III Toshiba Satellite laptop, it ran somewhat decently, used the VESA 2.0 800x600 mode, for the 32-bit color support.