Font size calculation discrepancy

[DanRStevens]

There is a discrepancy in how the size of Font text is calculated between the Font class and the RendererOpenGL class.

The Font class calculates width of text using:

width += gml[glyph].advance + gml[glyph].minX;

This appears to give a larger width than is actually displayed.

Meanwhile, the RendererOpenGL class advances Font position using:

offset += gm.advance;

These two should match up.

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SDL TTF documentation:

• https://www.libsdl.org/projects/old/SDL_ttf/docs/index.html

The most relevant section appears to be for TTF_GlyphMetrics:

• https://www.libsdl.org/projects/old/SDL_ttf/docs/SDL_ttf.html#SEC38

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Related:

• Issue Increase Font size OutpostUniverse/OPHD#1548 (comment)

Here it was noted the Button font text didn't look very centered