[cairo-bugs] [Bug 59817] New: Cairo 1.12 cannot print alpha lines in Windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59817

          Priority: medium
            Bug ID: 59817
          Assignee: cairo-bugs at cairographics.org
           Summary: Cairo 1.12 cannot print alpha lines in Windows
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mike at cchtml.com
          Hardware: Other
            Status: NEW
           Version: 1.12.8
         Component: win32 backend
           Product: cairo

Cairo 1.10 prints lines with alpha just fine. Switching to a Cairo 1.12.10 DLL,
all my alpha lines turned opaque and print solid black.

When printing with 1.12.10 in Linux, my lines are still printing with alpha set
correctly.

Example code:

    cairo_save( cr );
    cairo_set_source_rgba( cr, 0.0, 0.0, 0.0, 0.25 );
    cairo_set_line_width( cr, 8.0 );
    cairo_move_to( cr, cwidth / 2 - ( 100 - x ), ( y ) / 2 );
    cairo_line_to( cr, ( cwidth / 2 - ( 100 - x ) ) + length, y / 2 );
    cairo_stroke( cr );
    cairo_restore( cr );

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