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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // | ||
| // Croper+Crop.swift | ||
| // JPCrop | ||
| // | ||
| // Created by Rogue24 on 2022/3/5. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
||
| extension Croper { | ||
| func getCropFactorSafely() -> CropFactor { | ||
| var ratio: CGFloat = 0 | ||
| var scale: CGFloat = 0 | ||
| var translate: CGPoint = .zero | ||
| var radian: CGFloat = 0 | ||
| var height: CGFloat = 0 | ||
|
|
||
| Self.executeInMainQueue { | ||
| ratio = self.cropWHRatio > 0 ? self.cropWHRatio : self.fitCropWHRatio(self.imageWHRatio) | ||
| scale = self.scaleValue(self.scrollView.transform) * self.scrollView.zoomScale | ||
| translate = self.borderLayer.convert(CGPoint(x: self.cropFrame.origin.x, y: self.cropFrame.maxY), to: self.imageView.layer) | ||
| radian = self.actualRadian | ||
| height = self.imageView.bounds.height | ||
| } | ||
|
|
||
| return CropFactor(cropWHRatio: ratio, | ||
| scale: scale, | ||
| convertTranslate: translate, | ||
| radian: radian, | ||
| imageBoundsHeight: height) | ||
| } | ||
|
|
||
| static func crop(_ compressScale: CGFloat, | ||
| _ imageRef: CGImage, | ||
| _ factor: CropFactor) -> UIImage? { | ||
| let width = CGFloat(imageRef.width) * compressScale | ||
| let height = CGFloat(imageRef.height) * compressScale | ||
|
|
||
| // 获取裁剪尺寸和裁剪区域 | ||
| let cropWHRatio = factor.cropWHRatio | ||
| var rendSize: CGSize | ||
| if width > height { | ||
| rendSize = CGSize(width: height * cropWHRatio, height: height) | ||
| if rendSize.width > width { | ||
| rendSize = CGSize(width: width, height: width / cropWHRatio) | ||
| } | ||
| } else { | ||
| rendSize = CGSize(width: width, height: width / cropWHRatio) | ||
| if rendSize.height > height { | ||
| rendSize = CGSize(width: height * cropWHRatio, height: height) | ||
| } | ||
| } | ||
|
|
||
| var bitmapRawValue = CGBitmapInfo.byteOrder32Little.rawValue | ||
| let alphaInfo = imageRef.alphaInfo | ||
| if alphaInfo == .premultipliedLast || | ||
| alphaInfo == .premultipliedFirst || | ||
| alphaInfo == .last || | ||
| alphaInfo == .first { | ||
| bitmapRawValue += CGImageAlphaInfo.premultipliedFirst.rawValue | ||
| } else { | ||
| bitmapRawValue += CGImageAlphaInfo.noneSkipFirst.rawValue | ||
| } | ||
|
|
||
| guard let context = CGContext(data: nil, | ||
| width: Int(rendSize.width), | ||
| height: Int(rendSize.height), | ||
| bitsPerComponent: 8, | ||
| bytesPerRow: 0, | ||
| space: CGColorSpaceCreateDeviceRGB(), | ||
| bitmapInfo: bitmapRawValue) else { return nil } | ||
|
|
||
| let scale = factor.scale | ||
| let radian = factor.radian | ||
|
|
||
| let ibHeight = factor.imageBoundsHeight | ||
| let iScale = CGFloat(imageRef.height) / (ibHeight * scale) | ||
| var translate = factor.convertTranslate | ||
| translate.y = ibHeight - translate.y // 左下点与底部的距离 | ||
| translate.x *= -1 * scale * iScale | ||
| translate.y *= -1 * scale * iScale | ||
|
|
||
| var transform = CGAffineTransform(scaleX: scale, y: scale) | ||
| transform = transform.rotated(by: -radian) | ||
| transform = transform.translatedBy(x: translate.x, y: translate.y) | ||
|
|
||
| context.setShouldAntialias(true) | ||
| context.setAllowsAntialiasing(true) | ||
| context.interpolationQuality = .high | ||
| // 旋转+缩放+位移 | ||
| context.concatenate(transform) | ||
| // 绘制 | ||
| context.draw(imageRef, in: CGRect(x: 0, y: 0, width: width, height: height)) | ||
|
|
||
| guard let newImageRef = context.makeImage() else { return nil } | ||
| return UIImage(cgImage: newImageRef) | ||
| } | ||
| } |
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