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The rendering mode used for Android is called GPU Vector. Both the creation of individual pixel buffers and scene compositing are done by the GPU. The GPU is particularly useful in this performance-constrained environment.
The GPU rendering technique only benefits vector art. It reduces the time needed to rasterize vector graphics, especially complex ones, to a bitmap. A bitmap is already a pixel buffer, also called a texture. There is no need to duplicate it. In fact, doing so would waste precious memory.