ImageKnife/library/src/main/ets/downsampling/DownsampleUtils.ets

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/*
* Copyright (C) 2024 Huawei Device Co., Ltd.
* 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 enum SampleSizeRounding {
/**
* Prefer to round the sample size up so that the image is downsampled to smaller than the
* requested size to use less memory.
*/
//(内存优先)
MEMORY,
/**
* Prefer to round the sample size down so that the image is downsampled to larger than the
* requested size to maintain quality at the expense of extra memory usage.
*/
//(质量优先)
QUALITY
}
export function highestOneBit(i: number): number {
i |= (i >> 1);
i |= (i >> 2);
i |= (i >> 4);
i |= (i >> 8);
i |= (i >> 16);
return i - (i >>> 1);
}