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Tune outgoing photo resizing & compression

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This commit is contained in:
Ilya Laktyushin 2020-11-16 22:45:24 +04:00
parent 3166742ddb
commit 4e35d6e5bf
2 changed files with 90 additions and 8 deletions
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96
submodules/LocalMediaResources/Sources/FetchPhotoLibraryImageResource.swift
View File

@ -4,12 +4,84 @@ import Photos
import Postbox
import SwiftSignalKit
import ImageCompression
import Accelerate.vImage
private final class RequestId {
var id: PHImageRequestID?
var invalidated: Bool = false
}
private func resizedImage(_ image: UIImage, for size: CGSize) -> UIImage? {
guard let cgImage = image.cgImage else {
return nil
}
var format = vImage_CGImageFormat(bitsPerComponent: 8,
bitsPerPixel: 32,
colorSpace: nil,
bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.first.rawValue),
version: 0,
decode: nil,
renderingIntent: .defaultIntent)
var error: vImage_Error
var sourceBuffer = vImage_Buffer()
defer { sourceBuffer.data.deallocate() }
error = vImageBuffer_InitWithCGImage(&sourceBuffer,
&format,
nil,
cgImage,
vImage_Flags(kvImageNoFlags))
guard error == kvImageNoError else { return nil }
var destinationBuffer = vImage_Buffer()
error = vImageBuffer_Init(&destinationBuffer,
vImagePixelCount(size.height),
vImagePixelCount(size.width),
format.bitsPerPixel,
vImage_Flags(kvImageNoFlags))
guard error == kvImageNoError else {
return nil
}
error = vImageScale_ARGB8888(&sourceBuffer,
&destinationBuffer,
nil,
vImage_Flags(kvImageHighQualityResampling))
guard error == kvImageNoError else {
return nil
}
guard let resizedImage =
vImageCreateCGImageFromBuffer(&destinationBuffer,
&format,
nil,
nil,
vImage_Flags(kvImageNoAllocate),
&error)?.takeRetainedValue(),
error == kvImageNoError
else {
return nil
}
return UIImage(cgImage: resizedImage)
}
extension UIImage.Orientation {
init(_ cgOrientation: CGImagePropertyOrientation) {
switch cgOrientation {
case .up: self = .up
case .upMirrored: self = .upMirrored
case .down: self = .down
case .downMirrored: self = .downMirrored
case .left: self = .left
case .leftMirrored: self = .leftMirrored
case .right: self = .right
case .rightMirrored: self = .rightMirrored
}
}
}
public func fetchPhotoLibraryResource(localIdentifier: String) -> Signal<MediaResourceDataFetchResult, MediaResourceDataFetchError> {
return Signal { subscriber in
let fetchResult = PHAsset.fetchAssets(withLocalIdentifiers: [localIdentifier], options: nil)
@ -28,7 +100,9 @@ public func fetchPhotoLibraryResource(localIdentifier: String) -> Signal<MediaRe
}
let size = CGSize(width: 1280.0, height: 1280.0)
let requestIdValue = PHImageManager.default().requestImage(for: asset, targetSize: size, contentMode: .aspectFit, options: option, resultHandler: { (image, info) -> Void in
let startTime = CACurrentMediaTime()
let requestIdValue = PHImageManager.default().requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: option, resultHandler: { (image, info) -> Void in
Queue.concurrentDefaultQueue().async {
requestId.with { current -> Void in
if !current.invalidated {
@ -42,17 +116,24 @@ public func fetchPhotoLibraryResource(localIdentifier: String) -> Signal<MediaRe
//subscriber.putNext(.reset)
}
} else {
_ = madeProgress.swap(true)
#if DEBUG
print("load completion \((CACurrentMediaTime() - startTime) * 1000.0) ms")
#endif
_ = madeProgress.swap(true)
let scale = min(1.0, min(size.width / max(1.0, image.size.width), size.height / max(1.0, image.size.height)))
let scaledSize = CGSize(width: floor(image.size.width * scale), height: floor(image.size.height * scale))
UIGraphicsBeginImageContextWithOptions(scaledSize, true, 1.0)
image.draw(in: CGRect(origin: CGPoint(), size: scaledSize))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let scaledImage = resizedImage(image, for: scaledSize)
#if DEBUG
print("scaled completion \((CACurrentMediaTime() - startTime) * 1000.0) ms")
#endif
if let scaledImage = scaledImage, let data = compressImageToJPEG(scaledImage, quality: 0.6) {
#if DEBUG
print("compression completion \((CACurrentMediaTime() - startTime) * 1000.0) ms")
#endif
subscriber.putNext(.dataPart(resourceOffset: 0, data: data, range: 0 ..< data.count, complete: true))
subscriber.putCompletion()
} else {
@ -149,3 +230,4 @@ public func fetchPhotoLibraryImage(localIdentifier: String, thumbnail: Bool) ->
}
}
}

2
submodules/MozjpegBinding/Sources/MozjpegBinding.m
View File

@ -125,7 +125,7 @@ NSData * _Nullable compressJPEGData(UIImage * _Nonnull sourceImage) {
cinfo.arith_code = FALSE;
cinfo.dct_method = JDCT_ISLOW;
cinfo.optimize_coding = TRUE;
jpeg_set_quality(&cinfo, 78, 1);
jpeg_set_quality(&cinfo, 72, 1);
jpeg_simple_progression(&cinfo);
jpeg_start_compress(&cinfo, 1);