gx

chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @license
 * Copyright 2018 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 ResizeNearestNeighborProgram {
    constructor(inputShape, newHeight, newWidth, alignCorners, halfPixelCenters) {
        this.variableNames = ['A'];
        this.outputShape = [];
        const [batch, oldHeight, oldWidth, depth] = inputShape;
        this.outputShape = [batch, newHeight, newWidth, depth];
        const effectiveInSize = [
            (alignCorners && newHeight > 1) ? oldHeight - 1 : oldHeight,
            (alignCorners && newWidth > 1) ? oldWidth - 1 : oldWidth
        ];
        const effectiveOutSize = [
            (alignCorners && newHeight > 1) ? newHeight - 1 : newHeight,
            (alignCorners && newWidth > 1) ? newWidth - 1 : newWidth
        ];
        // When align corners is false, we rounds the value with floor.
        const roundBase = alignCorners ? '0.5' : '0.0';
        let sourceFracIndexRC;
        if (halfPixelCenters) {
            sourceFracIndexRC =
                `max((vec2(yRC) + vec2(0.5)) * effectiveInputOverOutputRatioRC` +
                    `, vec2(0.0))`;
        }
        else {
            sourceFracIndexRC = `vec2(yRC) * effectiveInputOverOutputRatioRC`;
        }
        this.userCode = `
      const vec2 effectiveInputOverOutputRatioRC = vec2(
          ${effectiveInSize[0] / effectiveOutSize[0]},
          ${effectiveInSize[1] / effectiveOutSize[1]});
      const vec2 inputShapeRC = vec2(${oldHeight}.0, ${oldWidth}.0);
 
      void main() {
        ivec4 coords = getOutputCoords();
        int b = coords[0];
        int d = coords[3];
        ivec2 yRC = coords.yz;
 
        // Fractional source index.
        vec2 sourceFracIndexRC = ${sourceFracIndexRC};
 
        // Compute the coordinators of nearest neighbor point.
        ivec2 sourceNearestRC = ivec2(
          min(inputShapeRC - 1.0, floor(sourceFracIndexRC + ${roundBase})));
        float newValue = getA(b, sourceNearestRC.x, sourceNearestRC.y, d);
 
        setOutput(newValue);
      }
    `;
    }
}
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