得到指向位图一个实际像素值的指针。
Retrieves a pointer to the actual pixel values of the bitmap.
另一方面，只有人们相信那些帐目，像素，绿皮书的边角确有实际价值，这种机制才能得以运作。
On the other hand, this engine revs only if people have faith that those ledger entries, those pixels, those scraps of green paper, represent actual value.
为保证这些图像组件按正确顺序绘制，每个像素 — 或 块（详见下文）—的帧在实际的位块传输步骤开始之前就已经确定。
To keep these image components drawn in the correct order, each pixel's — or chunk's (more on that below) — frame is determined prior to the actual blitting steps.
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