@lightningtv/renderer/src/core/shaders/canvas/Rounded.ts

Lightning 3 Renderer

/*
 * Copyright 2023 Comcast Cable Communications Management, LLC
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

import { calcFactoredRadiusArray } from '../../lib/utils.js';
import type { CanvasShaderType } from '../../renderers/canvas/CanvasShaderNode.js';
import type { Vec4 } from '../../renderers/webgl/internal/ShaderUtils.js';
import {
  RoundedTemplate,
  type RoundedProps,
} from '../templates/RoundedTemplate.js';
import { roundRect } from './utils/render.js';

export interface ComputedRoundedValues {
  radius: Vec4;
}

export const Rounded: CanvasShaderType<RoundedProps, ComputedRoundedValues> = {
  props: RoundedTemplate.props,
  saveAndRestore: true,
  update(node) {
    this.computed.radius = calcFactoredRadiusArray(
      this.props!.radius as Vec4,
      node.width,
      node.height,
    );
  },
  render(ctx, quad, renderContext) {
    const path = new Path2D();
    roundRect(
      path,
      quad.tx,
      quad.ty,
      quad.width,
      quad.height,
      this.computed.radius!,
    );
    ctx.clip(path);

    renderContext();
  },
};