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commit 9aec8eefecbafab76c044907433286d16c36b679
Author:     Nico Weber <thakis@chromium.org>
AuthorDate: Sun Feb 16 21:49:14 2025 -0500
Commit:     Nico Weber <thakis@chromium.org>
CommitDate: Tue Feb 18 08:42:29 2025 -0500

    LibPDF: Implement painting of axial shadings
    
    Or, as they're called elsewhere, linear gradients.
    
    Since this uses PDF function objects and PDF color spaces, it can't use
    the existing gradient code in LibGfx.
    
    The way shadings are drawn with the `sh` operator is that one sets a
    clip path that's to be filled with the shading and the calls the `sh`
    operator.
    
    However, we only support clip rects at the moment, not yet arbitrary
    clip paths. So this leads to rectangles with linear gradients
    appearing, which sometimes can overlap other page elements. This will
    improve once we implement support for arbitrary clip paths.
    
    This is also still missing support for the optional additional /BBox
    shading dict entry, which further constrains the clip rect.