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import GObject from 'gi://GObject';
import * as utils from '../conveniences/utils.js';
const St = await utils.import_in_shell_only('gi://St');
const Shell = await utils.import_in_shell_only('gi://Shell');
const Clutter = await utils.import_in_shell_only('gi://Clutter');
const SHADER_FILENAME = 'gaussian_blur.glsl';
const DEFAULT_PARAMS = {
radius: 30, brightness: .6,
width: 0, height: 0, direction: 0, chained_effect: null
};
export const GaussianBlurEffect = utils.IS_IN_PREFERENCES ?
{ default_params: DEFAULT_PARAMS } :
new GObject.registerClass({
GTypeName: "GaussianBlurEffect",
Properties: {
'radius': GObject.ParamSpec.double(
`radius`,
`Radius`,
`Blur radius`,
GObject.ParamFlags.READWRITE,
0.0, 2000.0,
30.0,
),
'brightness': GObject.ParamSpec.double(
`brightness`,
`Brightness`,
`Blur brightness`,
GObject.ParamFlags.READWRITE,
0.0, 1.0,
0.6,
),
'width': GObject.ParamSpec.double(
`width`,
`Width`,
`Width`,
GObject.ParamFlags.READWRITE,
0.0, Number.MAX_SAFE_INTEGER,
0.0,
),
'height': GObject.ParamSpec.double(
`height`,
`Height`,
`Height`,
GObject.ParamFlags.READWRITE,
0.0, Number.MAX_SAFE_INTEGER,
0.0,
),
'direction': GObject.ParamSpec.int(
`direction`,
`Direction`,
`Direction`,
GObject.ParamFlags.READWRITE,
0, 1,
0,
),
'chained_effect': GObject.ParamSpec.object(
`chained_effect`,
`Chained Effect`,
`Chained Effect`,
GObject.ParamFlags.READWRITE,
GObject.Object,
),
}
}, class GaussianBlurEffect extends Clutter.ShaderEffect {
constructor(params) {
super(params);
utils.setup_params(this, params);
// set shader source
this._source = utils.get_shader_source(Shell, SHADER_FILENAME, import.meta.url);
if (this._source)
this.set_shader_source(this._source);
const theme_context = St.ThemeContext.get_for_stage(global.stage);
theme_context.connectObject(
'notify::scale-factor', _ =>
this.set_uniform_value('sigma',
parseFloat(this.radius * theme_context.scale_factor / 2 - 1e-6)
),
this
);
}
static get default_params() {
return DEFAULT_PARAMS;
}
get radius() {
return this._radius;
}
set radius(value) {
if (this._radius !== value) {
this._radius = value;
const scale_factor = St.ThemeContext.get_for_stage(global.stage).scale_factor;
// like Clutter, we use the assumption radius = 2*sigma
this.set_uniform_value('sigma', parseFloat(this._radius * scale_factor / 2 - 1e-6));
this.set_enabled(this.radius > 0.);
if (this.chained_effect)
this.chained_effect.radius = value;
}
}
get brightness() {
return this._brightness;
}
set brightness(value) {
if (this._brightness !== value) {
this._brightness = value;
this.set_uniform_value('brightness', parseFloat(this._brightness - 1e-6));
if (this.chained_effect)
this.chained_effect.brightness = value;
}
}
get width() {
return this._width;
}
set width(value) {
if (this._width !== value) {
this._width = value;
this.set_uniform_value('width', parseFloat(this._width + 3.0 - 1e-6));
if (this.chained_effect)
this.chained_effect.width = value;
}
}
get height() {
return this._height;
}
set height(value) {
if (this._height !== value) {
this._height = value;
this.set_uniform_value('height', parseFloat(this._height + 3.0 - 1e-6));
if (this.chained_effect)
this.chained_effect.height = value;
}
}
get direction() {
return this._direction;
}
set direction(value) {
if (this._direction !== value)
this._direction = value;
}
get chained_effect() {
return this._chained_effect;
}
set chained_effect(value) {
this._chained_effect = value;
}
vfunc_set_actor(actor) {
if (this._actor_connection_size_id) {
let old_actor = this.get_actor();
old_actor?.disconnect(this._actor_connection_size_id);
}
if (actor) {
this.width = actor.width;
this.height = actor.height;
this._actor_connection_size_id = actor.connect('notify::size', _ => {
this.width = actor.width;
this.height = actor.height;
});
}
else
this._actor_connection_size_id = null;
super.vfunc_set_actor(actor);
if (this.direction == 0) {
if (this.chained_effect)
this.chained_effect.get_actor()?.remove_effect(this.chained_effect);
else
this.chained_effect = new GaussianBlurEffect({
radius: this.radius,
brightness: this.brightness,
width: this.width,
height: this.height,
direction: 1
});
if (actor !== null)
actor.add_effect(this.chained_effect);
}
}
vfunc_paint_target(paint_node, paint_context) {
this.set_uniform_value("dir", this.direction);
super.vfunc_paint_target(paint_node, paint_context);
}
});
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