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

Signed-off-by: 田双明 <tianshuangming@h-partners.com>
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田双明 2024-10-09 08:41:05 +00:00 committed by Gitee
parent 1b812f8431
commit d2cead637b
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library/src/main/ets/downsampling/DownsampleUtils.ets
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@ -12,6 +12,8 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { DownsampleStrategy } from './DownsampleStartegy';
export enum SampleSizeRounding {
/**
* Prefer to round the sample size up so that the image is downsampled to smaller than the
@ -26,6 +28,7 @@ export enum SampleSizeRounding {
//（质量优先）
QUALITY
}
export function highestOneBit(i: number): number {
i |= (i >> 1);
i |= (i >> 2);
@ -34,3 +37,21 @@ export function highestOneBit(i: number): number {
i |= (i >> 16);
return i - (i >>> 1);
}
export function getScale(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number,
downsampType: DownsampleStrategy
): number {
if (downsampType === DownsampleStrategy.FIT_CENTER_MEMORY) {
const widthPercentage = requestedWidth / sourceWidth
const heightPercentage = requestedHeight / sourceHeight
return Math.min(widthPercentage, heightPercentage)
} else {
const maxIntegerFactor = Math.max(sourceHeight / requestedHeight, sourceWidth / requestedWidth);
return maxIntegerFactor === 0 ? 1 : 1 / highestOneBit(maxIntegerFactor);
}
}
export function round(value: number): number {
return Math.floor(value + 0.5);
}