Help troubleshoot drawing auto-generated font outline

[edmundito]

Hello, I am working on a port of the engine for a new platform (more info is coming soon, but I am still not ready to go public with it). Unfortunately, the auto-generated font outlines are not rendering for whatever reason.

I am unfamiliar with this area, but here is what I understood from the code: The text is rendered into an allegro bitmap along with the outline. Am I correct?

Does anyone know where to start looking for answers? I'd love to get an explanation of how the font outline is rendered to see if I can troubleshoot it somehow.

Here are some specs about the game I'm using to test:

Resolution: 320x180
Color: 32-bit
Engine version: 3.6.1 P9
Renderer: OpenGL ES

Font settings;

attn @ivan-mogilko

[ivan-mogilko]

The automatic outlines are created by function wouttextxy_AutoOutline:

ags/Engine/ac/display.cpp

Line 526 in 50da366

void wouttextxy_AutoOutline(Bitmap *ds, size_t font, int32_t color, const char *texx, int &xxp, int &yyp)

The implementation is:

• draw a text with outline color on a temporary bitmap called "stencil"
• draw the stencil bitmap onto the destination bitmap N times with certain offsets (-X, +X)
• draw the text with text color over the destination bitmap.

This whole operation is done using software drawing, and therefore is supposed to be both platform independent and graphics renderer independent.