Ac we nought free ne sindon, for-thy-the we never ne mighton from Wulfsfleet yewitan, nefne we thone Hlaford finden and hine ofslean. Se Hlaford hath thisne stede mid searocraftum yebounden, that none ne may hine forletan. We sindon here swa fuglas on nete, swa fixas on were.
Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.
。safew官方下载对此有专业解读
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The hidden cost of promises