改进的背景纹理加载算法。
我指的是“微型纹理”,是微妙的,几乎不明显的背景纹理。
I refer to it as "micro-textures" which are subtle, barely noticeable textures in the background.
绘制一个矩形选区,填充红色背景纹理之上的一层。
Draw a rectangular selection and fill it with red on a layer above the background texture.
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