Function DrawSelectionSprite

src/viewport.cpp:897–906

* Draws sprites between ground sprite and everything above. * * The sprite is either drawn as TileSprite or as ChildSprite of the active foundation. * * @param image the image to draw. * @param pal the provided palette. * @param ti TileInfo Tile that is being drawn * @param z_offset Z offset relative to the groundsprite. Only used for the sprite position, not for sprite sorting. * @param f

 * @param extra_offs_y Pixel Y offset for the sprite position.
 */
static void DrawSelectionSprite(SpriteID image, PaletteID pal, const TileInfo *ti, int z_offset, FoundationPart foundation_part, int extra_offs_x = 0, int extra_offs_y = 0)
{
	if (_vd.foundation[foundation_part] == -1) {
		/* draw on real ground */
		AddTileSpriteToDraw(image, pal, ti->x, ti->y, ti->z + z_offset, nullptr, extra_offs_x, extra_offs_y);
	} else {
		/* draw on top of foundation */
		AddChildSpriteToFoundation(image, pal, nullptr, foundation_part, extra_offs_x, extra_offs_y - z_offset * ZOOM_BASE);
	}
}

/**
 * Draws a selection rectangle on a tile.