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[client] wayland: improve fractional scaling

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avoids the 24.8 quantisation without introducing floating-point
equality/rounding behaviour throughout the Wayland state.

Closes #1257
This commit is contained in:
Geoffrey McRae
2026-05-31 13:15:42 +10:00
parent dba2d23eb2
commit 01b8724cfe
6 changed files with 103 additions and 21 deletions
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14
client/displayservers/Wayland/output.c
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@@ -29,17 +29,17 @@
static void outputUpdateScale(struct WaylandOutput * node)
{
wl_fixed_t original = node->scale;
struct WaylandScale original = node->scale;
if (!wlWm.useFractionalScale || !wlWm.viewporter || !node->logicalWidth)
node->scale = wl_fixed_from_int(node->scaleInt);
node->scale = waylandScaleFromInt(node->scaleInt);
else
{
int32_t modeWidth = node->modeRotate ? node->modeHeight : node->modeWidth;
node->scale = wl_fixed_from_double(1.0 * modeWidth / node->logicalWidth);
node->scale = waylandScaleFromRatio(modeWidth, node->logicalWidth);
}
if (original != node->scale)
if (!waylandScaleEqual(original, node->scale))
waylandWindowUpdateScale();
}
@@ -167,7 +167,7 @@ void waylandOutputBind(uint32_t name, uint32_t version)
}
node->name = name;
node->scale = 0;
node->scale = waylandScaleFromInt(0);
node->version = version;
node->output = wl_registry_bind(wlWm.registry, name,
&wl_output_interface, version >= 3 ? 3 : 2);
@@ -209,12 +209,12 @@ void waylandOutputTryUnbind(uint32_t name)
}
}
wl_fixed_t waylandOutputGetScale(struct wl_output * output)
struct WaylandScale waylandOutputGetScale(struct wl_output * output)
{
struct WaylandOutput * node;
wl_list_for_each(node, &wlWm.outputs, link)
if (node->output == output)
return node->scale;
return 0;
return waylandScaleFromInt(0);
}