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only add circuitpython_splash to display if it's not in another group #7829

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merged 2 commits into from
Apr 5, 2023
Merged

only add circuitpython_splash to display if it's not in another group #7829

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60e12c5
only add circuitpython_splash to display if it's not already in anoth…
FoamyGuy Apr 3, 2023
8bf94d0
try to fix multi-display reset
FoamyGuy Apr 5, 2023
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4 changes: 3 additions & 1 deletion shared-module/displayio/Display.c
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,9 @@ void common_hal_displayio_display_construct(displayio_display_obj_t *self,

// Set the group after initialization otherwise we may send pixels while we delay in
// initialization.
common_hal_displayio_display_set_root_group(self, &circuitpython_splash);
if (!circuitpython_splash.in_group) {
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This code looks fine, but I noticed a few lines later it checks if root_group is NULL and if so assigns it to circuitpython_splash with no checks and not using the function. Not sure how that may affect anything. But your check on its own looks good.

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Are you talking about when calling display.show(None) ? It uses common_hal_displayio_display_show which does a few checks, including if the group is already in a group, and returns False when those checks fail. That return is checked and an exception is raised in the shared-bindings part:

circuitpython/shared-bindings/displayio/Display.c

Lines 261 to 264 in 4e7bbf7

bool ok = common_hal_displayio_display_show(self, group);
if (!ok) {
mp_raise_ValueError(translate("Group already used"));
}

Maybe it could use common_hal_displayio_display_set_root_group instead. (show() is deprecated anyway).

common_hal_displayio_display_set_root_group(self, &circuitpython_splash);
}
common_hal_displayio_display_set_auto_refresh(self, auto_refresh);
}

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