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

Signed-off-by: 田双明 <tianshuangming@h-partners.com>
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田双明 2024-10-10 08:18:16 +00:00 committed by Gitee
parent c9957c458f
commit ba95318b57
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1 changed files with 4 additions and 50 deletions
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54
library/src/main/ets/downsampling/DownsampleStartegy.ets
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@ -28,50 +28,16 @@ export class FitCenter implements BaseDownsampling {
width: round(getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType) * sourceWidth),
height:round(getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType) * sourceHeight)
}
let scaleFactor = this.getSampleSizeType(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)===
SampleSizeRounding.QUALITY? Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height))) :
let scaleFactor = downsampType === DownsampleStrategy.FIT_CENTER_QUALITY?
Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height))) :
Math.max(1, highestOneBit(Math.min(sourceWidth / outSize.width, sourceHeight / outSize.height)))//将整型的缩放因子转换为2的次幂采样大小
if (this.getSampleSizeType(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)===
SampleSizeRounding.MEMORY && (scaleFactor < (1 / getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)))) {
if (downsampType === DownsampleStrategy.FIT_CENTER_MEMORY
&& (scaleFactor < (1 / getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)))) {
scaleFactor = scaleFactor << 1;
}
return scaleFactor
}
getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number, requestedHeight: number,
downsampType: DownsampleStrategy
): number {
if (downsampType === DownsampleStrategy.FIT_CENTER_QUALITY) {
return SampleSizeRounding.QUALITY;
} else {
return SampleSizeRounding.MEMORY;
}
}
}
export class None implements BaseDownsampling {
getName(): string {
return "DownsampleNone"
}
public getScaleFactor(sourceWidth: number, sourceHeight: number, requestedWidth: number,
requestedHeight: number): number {
let outSize: Size = {
width: round(sourceWidth),
height:round(sourceHeight)
}
let scaleFactor =
Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height)))
return scaleFactor
}
//实现 getSampleSizeType 方法
public getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number,
requestedHeight: number): SampleSizeRounding {
return SampleSizeRounding.QUALITY
}
}
@ -95,11 +61,6 @@ export class CenterOutside implements BaseDownsampling {
return scaleFactor
}
getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number,
requestedHeight: number): SampleSizeRounding {
return SampleSizeRounding.QUALITY;
}
}
/*请求尺寸大于实际尺寸不进行放大,按照原图展示*/
@ -129,13 +90,6 @@ export class AtMost implements BaseDownsampling {
}
return scaleFactor
}
getSampleSizeType(sourceWidth: number, sourceHeight: number, requestedWidth: number,
requestHeight: number): SampleSizeRounding {
//根据 AtMost 的逻辑，总是返回 MEMORY
return SampleSizeRounding.MEMORY
}
}
/*宽高进行等比缩放宽高里面最大的比例先放进去