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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {Effects} from '@/common/components/video/effects/Effects';
import {Tracklet} from '@/common/tracker/Tracker';
import {RLEObject} from '@/jscocotools/mask';
import {CanvasForm} from 'pts';
export type EffectLayers = {
background: keyof Effects;
highlight: keyof Effects;
};
export type EffectOptions = {
variant: number;
};
export type EffectInit = {
width: number;
height: number;
gl?: WebGL2RenderingContext;
canvas?: OffscreenCanvas;
};
export type EffectMask = {
bitmap: ImageBitmap | RLEObject;
bounds: [[number, number], [number, number]];
};
export type EffectActionPoint = {
objectId: number;
position: [number, number];
};
export type EffectFrameContext = {
frameIndex: number;
totalFrames: number;
fps: number;
width: number;
height: number;
masks: EffectMask[];
maskColors: string[];
frame: ImageBitmap;
timeParameter?: number;
actionPoint: EffectActionPoint | null;
};
export interface Effect {
variant: number;
numVariants: number;
nextVariant(): void;
setup(init: EffectInit): Promise<void>;
update(options: EffectOptions): Promise<void>;
cleanup(): Promise<void>;
apply(
form: CanvasForm,
context: EffectFrameContext,
tracklets: Tracklet[],
): void;
}
export abstract class AbstractEffect implements Effect {
public numVariants: number;
public variant: number;
constructor(numVariants: number) {
this.numVariants = numVariants;
this.variant = 0;
}
nextVariant() {
// Cycle through variants
this.variant = (this.variant + 1) % this.numVariants;
}
async setup(_init: EffectInit): Promise<void> {
// noop
}
async update(options: EffectOptions): Promise<void> {
this.variant = options.variant;
}
async cleanup(): Promise<void> {
// noop
}
abstract apply(
form: CanvasForm,
context: EffectFrameContext,
tracklets: Tracklet[],
): void;
}
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