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Cursor: fix high polling rate resize regression

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The previous commit ended up clamping the accumulated f64 offset to an
integer every frame, losing any sub-pixel cursor motions. This has been
known to cause problems with high polling rate mice in the past.

Return to the same approve the move cursor mode uses to solve this and
accumulate a separate sub-pixel delta.
This commit is contained in:
Isaac Freund 2023-11-14 15:36:25 +01:00
parent c50ed9c7e7
commit 68366c7331
No known key found for this signature in database
GPG Key ID: 86DED400DDFD7A11
1 changed files with 24 additions and 14 deletions
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38
river/Cursor.zig
View File

@ -76,10 +76,15 @@ const Mode = union(enum) {
resize: struct {
view: *View,
/// Total x/y movement of the pointer device since the start of the resize.
/// This is not directly tied to cursor position.
x: f64 = 0,
y: f64 = 0,
delta_x: f64 = 0,
delta_y: f64 = 0,
/// Total x/y movement of the pointer device since the start of the resize,
/// clamped to the bounds of the resize as defined by the view min/max
/// dimensions and output dimensions.
/// This is not directly tied to the rendered cursor position.
x: i32 = 0,
y: i32 = 0,
/// Resize edges, maximum of 2 are set and they may not be opposing edges.
edges: wlr.Edges,
@ -874,8 +879,13 @@ fn processMotion(self: *Self, device: *wlr.InputDevice, time: u32, delta_x: f64,
server.root.applyPending();
},
.resize => |*data| {
data.x += dx;
data.y += dy;
dx += data.delta_x;
dy += data.delta_y;
data.delta_x = dx - @trunc(dx);
data.delta_y = dy - @trunc(dy);
data.x += @intFromFloat(dx);
data.y += @intFromFloat(dy);
// Modify width/height of the pending box, taking constraints into account
// The x/y coordinates of the view will be adjusted as needed in View.resizeCommit()
@ -891,32 +901,32 @@ fn processMotion(self: *Self, device: *wlr.InputDevice, time: u32, delta_x: f64,
if (data.edges.left) {
const x2 = box.x + box.width;
box.width = data.initial_width - @as(i32, @intFromFloat(data.x));
box.width = data.initial_width - data.x;
box.width = @max(box.width, constraints.min_width);
box.width = @min(box.width, constraints.max_width);
box.width = @min(box.width, x2 - border_width);
data.x = @floatFromInt(data.initial_width - box.width);
data.x = data.initial_width - box.width;
} else if (data.edges.right) {
box.width = data.initial_width + @as(i32, @intFromFloat(data.x));
box.width = data.initial_width + data.x;
box.width = @max(box.width, constraints.min_width);
box.width = @min(box.width, constraints.max_width);
box.width = @min(box.width, output_width - border_width - box.x);
data.x = @floatFromInt(box.width - data.initial_width);
data.x = box.width - data.initial_width;
}
if (data.edges.top) {
const y2 = box.y + box.height;
box.height = data.initial_height - @as(i32, @intFromFloat(data.y));
box.height = data.initial_height - data.y;
box.height = @max(box.height, constraints.min_height);
box.height = @min(box.height, constraints.max_height);
box.height = @min(box.height, y2 - border_width);
data.y = @floatFromInt(data.initial_height - box.height);
data.y = data.initial_height - box.height;
} else if (data.edges.bottom) {
box.height = data.initial_height + @as(i32, @intFromFloat(data.y));
box.height = data.initial_height + data.y;
box.height = @max(box.height, constraints.min_height);
box.height = @min(box.height, constraints.max_height);
box.height = @min(box.height, output_height - border_width - box.y);
data.y = @floatFromInt(box.height - data.initial_height);
data.y = box.height - data.initial_height;
}
server.root.applyPending();