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window/xwayland: Handle arithmetics close to the int limits

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`(int) (1.0f * (float) INT_MAX)` doesn't necessarily result in INT_MAX
due to how floating point arithmetics. Handle this better by setting
INT_MIN/MAX explicitly, when the floating point value post scaling
exceeds the corresponding limit.

This fixes resizing of electron windows.

Fixes: 6e8c7c5f84 ("Add experimental mode to use native scaling of Xwayland clients")
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3997>
This commit is contained in:
Jonas Ådahl 2024-09-02 16:18:47 +02:00 committed by Marge Bot
parent b0e90c6523
commit 2d64965a55
1 changed files with 22 additions and 6 deletions
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28
src/wayland/meta-window-xwayland.c
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@ -337,6 +337,22 @@ meta_window_xwayland_stage_to_protocol (MetaWindow *window,
*protocol_y = stage_y * scale;
}
static int
scale_and_handle_overflow (int protocol,
float scale,
float (* rounding_function) (float value))
{
float value;
value = rounding_function (protocol * scale);
if (value >= (float) INT_MAX)
return INT_MAX;
else if (value <= (float) INT_MIN)
return INT_MIN;
else
return (int) value;
}
static void
meta_window_xwayland_protocol_to_stage (MetaWindow *window,
int protocol_x,
@ -360,21 +376,21 @@ meta_window_xwayland_protocol_to_stage (MetaWindow *window,
{
case MTK_ROUNDING_STRATEGY_SHRINK:
if (stage_x)
*stage_x = (int) floorf (protocol_x * scale);
*stage_x = scale_and_handle_overflow (protocol_x, scale, floorf);
if (stage_y)
*stage_y = (int) floorf (protocol_y * scale);
*stage_y = scale_and_handle_overflow (protocol_y, scale, floorf);
break;
case MTK_ROUNDING_STRATEGY_GROW:
if (stage_x)
*stage_x = (int) ceilf (protocol_x * scale);
*stage_x = scale_and_handle_overflow (protocol_x, scale, ceilf);
if (stage_y)
*stage_y = (int) ceilf (protocol_y * scale);
*stage_y = scale_and_handle_overflow (protocol_y, scale, ceilf);
break;
case MTK_ROUNDING_STRATEGY_ROUND:
if (stage_x)
*stage_x = (int) roundf (protocol_x * scale);
*stage_x = scale_and_handle_overflow (protocol_x, scale, roundf);
if (stage_y)
*stage_y = (int) roundf (protocol_y * scale);
*stage_y = scale_and_handle_overflow (protocol_y, scale, roundf);
break;
}
}