NetNewsWire/Shared/Extensions/RSImage-Extensions.swift

91 lines
2.6 KiB
Swift

//
// RSImage-Extensions.swift
// RSCore
//
// Created by Maurice Parker on 4/11/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import Foundation
import RSCore
extension RSImage {
static let avatarSize = 48
static func scaledForAvatar(_ data: Data, imageResultBlock: @escaping (RSImage?) -> Void) {
DispatchQueue.global().async {
let image = RSImage.scaledForAvatar(data)
DispatchQueue.main.async {
imageResultBlock(image)
}
}
}
static func scaledForAvatar(_ data: Data) -> RSImage? {
let scaledMaxPixelSize = Int(ceil(CGFloat(RSImage.avatarSize) * RSScreen.mainScreenScale))
guard var cgImage = RSImage.scaleImage(data, maxPixelSize: scaledMaxPixelSize) else {
return nil
}
if cgImage.width < avatarSize || cgImage.height < avatarSize {
cgImage = RSImage.compositeAvatar(cgImage)
}
#if os(iOS)
return RSImage(cgImage: cgImage)
#else
let size = NSSize(width: cgImage.width, height: cgImage.height)
return RSImage(cgImage: cgImage, size: size)
#endif
}
}
private extension RSImage {
#if os(iOS)
static func compositeAvatar(_ avatar: CGImage) -> CGImage {
let rect = CGRect(x: 0, y: 0, width: avatarSize, height: avatarSize)
UIGraphicsBeginImageContext(rect.size)
if let context = UIGraphicsGetCurrentContext() {
context.setFillColor(AppAssets.avatarLightBackgroundColor.cgColor)
context.fill(rect)
context.translateBy(x: 0.0, y: CGFloat(integerLiteral: avatarSize));
context.scaleBy(x: 1.0, y: -1.0)
let avatarRect = CGRect(x: (avatarSize - avatar.width) / 2, y: (avatarSize - avatar.height) / 2, width: avatar.width, height: avatar.height)
context.draw(avatar, in: avatarRect)
}
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img!.cgImage!
}
#else
static func compositeAvatar(_ avatar: CGImage) -> CGImage {
var resultRect = CGRect(x: 0, y: 0, width: avatarSize, height: avatarSize)
let resultImage = NSImage(size: resultRect.size)
resultImage.lockFocus()
if let context = NSGraphicsContext.current?.cgContext {
if NSApplication.shared.effectiveAppearance.isDarkMode {
context.setFillColor(AppAssets.avatarDarkBackgroundColor.cgColor)
} else {
context.setFillColor(AppAssets.avatarLightBackgroundColor.cgColor)
}
context.fill(resultRect)
let avatarRect = CGRect(x: (avatarSize - avatar.width) / 2, y: (avatarSize - avatar.height) / 2, width: avatar.width, height: avatar.height)
context.draw(avatar, in: avatarRect)
}
resultImage.unlockFocus()
return resultImage.cgImage(forProposedRect: &resultRect, context: nil, hints: nil)!
}
#endif
}