Refine source clipping coordinate adjustment #142
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The original code was functionally correct but semantically confusing. The delta (sdx, sdy) was calculated relative to dst_x/dst_y but applied to left/top in the rendering loop, which obscured the intent.
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The original code was functionally correct but semantically confusing. The delta (sdx, sdy) was calculated relative to dst_x/dst_y but applied to left/top in the rendering loop, which obscured the intent.
Summary by cubic
Clarified source/mask coordinate handling during clipping in _twin_composite_simple to make the 1:1 pixel mapping explicit. No functional changes; removes ambiguity and an outdated FIXME.