Planning out a font atlas

font-atlas-plan.cpp

std::shared_ptr<FontAtlas> generateFontAtlas(int fontId, int fontSizeInPixels, int sdfPadding)
{
/*	ACTION PLAN:
	create a new list (vector) in which to stage a set of character glyphs, each prepared in isolation
	for each character:
		load the character and its metrics from the font engine, using a very large font size (10 times the requested font size)
		create a new image expanded to include padding for the distance field
		copy the character bitmap into the centre of the image
		render the distance field into the image
		downsize the image
		create a new glyph object and store the character metrics and downsized image
		add the glyph object to the list
	sort the list by descending image height, which will reduce the amount of space required by the atlas
	start with a smaller atlas size which is square, with dimensions that are a power of 2
	do until we can fit all of the glyphs in our chosen atlas size
		for each glyph in the list
			copy the image into the font atlas
			add the character metrics to the font atlas lookup table
		if all of the glyphs fit in the atlas then
			we're done (break)
		else
			double the atlas width and height and reset it to a blank image
*/
}