We are going to write a function which simulates the recursive functions by creating and modifying StackFrame objects describing the computation as it runs. Consider the tree of function calls which occurs when the recursive functions are invoked; we are representing this exact tree as a data structure which we can traverse and mutate.
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纯色填充较为直接，渐变填充需将渐变定义编码至纹理缓冲区，供着色器根据像素位置计算色彩。数据包含渐变类型（线性/径向/锥形）及色标列表。片段着色器先计算渐变色彩，再与裁剪字形覆盖率相乘。（径向渐变实现较为复杂，可参考专业指南）。