gx

chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @license
 * Copyright 2020 Google LLC. All Rights Reserved.
 * 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.
 * =============================================================================
 */
export class RotateProgram {
    constructor(imageShape, fillValue) {
        this.variableNames = ['Image'];
        this.outputShape = [];
        this.customUniforms = [{ name: 'params', type: 'vec4' }];
        const imageHeight = imageShape[1];
        const imageWidth = imageShape[2];
        this.outputShape = imageShape;
        let fillSnippet = '';
        if (typeof fillValue === 'number') {
            fillSnippet = `float outputValue = ${fillValue.toFixed(2)};`;
        }
        else {
            fillSnippet = `
        vec3 fill = vec3(${fillValue.join(',')});
        float outputValue = fill[coords[3]];`;
        }
        this.userCode = `
        void main() {
          ivec4 coords = getOutputCoords();
          int x = coords[2];
          int y = coords[1];
          float coordXFloat = (float(x) - params[0]) * params[3] -
            (float(y) - params[1]) * params[2];
          float coordYFloat = (float(x) - params[0]) * params[2] +
            (float(y) - params[1]) * params[3];
          int coordX = int(round(coordXFloat + params[0]));
          int coordY = int(round(coordYFloat + params[1]));
          ${fillSnippet}
          if(coordX >= 0 && coordX < ${imageWidth} && coordY >= 0 && coordY < ${imageHeight}) {
            outputValue = getImage(coords[0], coordY, coordX, coords[3]);
          }
          setOutput(outputValue);
        }
    `;
    }
}
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