New subject: [Bug 55628] user32:monitor fails to change the screen bpp on macOS

21 Sep 2023

      https://bugs.winehq.org/show_bug.cgi?id=55628

            Bug ID: 55628
           Summary: user32:monitor fails to change the screen bpp on macOS
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: wine-bugs(a)winehq.org
          Reporter: fgouget(a)codeweavers.com

user32:monitor fails to change the screen bpp on macOS:

monitor.c:806: Test failed: Device \\.\DISPLAY1 test 1 expect dmBitsPerPel 16,
got 32
monitor.c:857: Test failed: Failed to find a different mode.
monitor.c:879: Test failed: Device \\.\DISPLAY1 test 0 expect dmBitsPerPel 8,
got 32
monitor.c:2416: Test failed: bpp 16: Expected 16, got 32.
monitor.c:2416: Test failed: bpp 8: Expected 8, got 32.
monitor.c:2467: Test failed: Expected BITSPIXEL 8, got 32.
monitor.c:2480: Test failed: Expected bpp 8, got 32.
monitor.c:2484: Test failed: Expected bpp 8, got 32.
monitor.c:2506: Test succeeded inside todo block: bpp 8: Selecting bitmap
succeeded.
monitor.c:2558: Test failed: Failed to find a different resolution for
\\.\DISPLAY1.
monitor.c:2571: Test failed: Expected BITSPIXEL 8, got 32.
monitor.c:2586: Test failed: Expected BITSPIXEL 16, got 32.

See https://test.winehq.org/data/patterns.html#user32:monitor

The failures are systematic and only happen on macOS (see Remi's
rbernon-macos-* cloud test machines).

Looking at macdrv_ChangeDisplaySettings() in dlls/winemac.drv/display.c it
looks like changing the display bit depth is not supported... at least by
winemac.drv if not by macOS itself. Windows applications that need 8 and 16 bpp
are probably old and rare now so this may not be a major compatibility issue,
but it is going to be an issue for this test. Hence the following questions:
* Does macOS support changing the display bit depth?
* If not is this something winemac.drv can emulate?
* If not, how can we get the test to not fail without essentially dropping
these tests on all platforms?

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[Bug 55628] New: user32:monitor fails to change the screen bpp on macOS

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