LibGfx: Clip edges above or below the visible area in the rasterizer

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This avoids doing pointless plotting for scanlines that will never be
seen.

Note: This currently can only clip edges vertically. Horizontal clipping
is more tricky, since edges that are not visible can still change how
things accumulate across the scanline.

Fixes #22382

Sadly, this causes a bunch of LibWeb test churn as this change
imperceptibly changes the final rasterized output.

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MacDue 2023-12-23 23:58:38 +00:00 • committed by Andreas Kling

parent fe04d83ef5

commit 64411127cb

18 changed files with 58 additions and 38 deletions

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