C project now uses drawing contexts to draw faded glyph variants to a cache.

Switched to an opaque fade gradient and white-transparent drawing mode to avoid a bug discovered in the C SDK.

playdate/matrix_lua/main.lua

@@ -30,6 +30,7 @@ do
 			local variant = glyph:copy()
 			glyphs[i][j] = variant
 			gfx.pushContext(variant)
+			gfx.setImageDrawMode(gfx.kDrawModeWhiteTransparent);
 			fadeGradient:draw(fade * (glyphWidth - fadeGradient.width), 0)
 			gfx.popContext()
 		end