After the pattern has been edited, a sequence of default substitutions are performed to canonicalize the set of available properties; this avoids the need for the lower layers to constantly provide default values for various font properties during renderi
After the pattern has been edited, a sequence of default substitutions are performed to canonicalize the set of available properties; this avoids the need for the lower layers to constantly provide default values for various font properties during renderi
需求样式经过修改后，接下来就进行预设的替换，把不典型的性质换为典型的性质；这么一来下层的画字程序就不必一直提供默认值给不同的字型性质。