2019-09-30 02:40:12 +02:00
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//
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2019-11-06 01:05:57 +01:00
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// IconImage.swift
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2019-09-30 02:40:12 +02:00
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// NetNewsWire
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//
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2019-11-06 01:05:57 +01:00
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// Created by Maurice Parker on 11/5/19.
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2019-09-30 02:40:12 +02:00
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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2020-01-13 01:38:04 +01:00
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#if os(macOS)
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import AppKit
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#else
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import UIKit
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#endif
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2019-11-06 01:05:57 +01:00
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import RSCore
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final class IconImage {
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lazy var isDark: Bool = {
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return image.isDark()
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}()
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2020-03-13 11:43:17 +01:00
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lazy var isBright: Bool = {
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return image.isBright()
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}()
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2019-11-06 01:05:57 +01:00
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let image: RSImage
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2020-08-10 20:53:21 +02:00
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let isSymbol: Bool
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2020-12-06 21:25:22 +01:00
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let isBackgroundSupressed: Bool
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2020-08-10 20:53:21 +02:00
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let preferredColor: CGColor?
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2020-07-21 04:01:25 +02:00
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2020-12-06 21:25:22 +01:00
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init(_ image: RSImage, isSymbol: Bool = false, isBackgroundSupressed: Bool = false, preferredColor: CGColor? = nil) {
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2019-11-06 01:05:57 +01:00
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self.image = image
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2020-07-21 04:01:25 +02:00
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self.isSymbol = isSymbol
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2020-08-10 20:53:21 +02:00
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self.preferredColor = preferredColor
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2020-12-06 21:25:22 +01:00
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self.isBackgroundSupressed = isBackgroundSupressed
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2019-11-06 01:05:57 +01:00
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}
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}
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#if os(macOS)
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extension NSImage {
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func isDark() -> Bool {
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return self.cgImage(forProposedRect: nil, context: nil, hints: nil)?.isDark() ?? false
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}
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2020-03-13 11:43:17 +01:00
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func isBright() -> Bool {
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2020-03-13 16:51:49 +01:00
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return self.cgImage(forProposedRect: nil, context: nil, hints: nil)?.isBright() ?? false
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2020-03-13 11:43:17 +01:00
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}
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2019-11-06 01:05:57 +01:00
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}
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#else
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extension UIImage {
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func isDark() -> Bool {
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return self.cgImage?.isDark() ?? false
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}
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2020-03-13 11:43:17 +01:00
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func isBright() -> Bool {
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return self.cgImage?.isBright() ?? false
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}
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2019-11-06 01:05:57 +01:00
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}
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#endif
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2019-09-30 02:40:12 +02:00
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2020-03-13 11:43:17 +01:00
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fileprivate enum ImageLuminanceType {
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case regular, bright, dark
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}
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2021-04-03 17:40:46 +02:00
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2019-09-30 02:40:12 +02:00
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extension CGImage {
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2020-03-13 11:43:17 +01:00
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func isBright() -> Bool {
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2021-04-03 17:40:46 +02:00
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guard let luminanceType = getLuminanceType() else {
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2020-03-13 11:43:17 +01:00
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return false
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}
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return luminanceType == .bright
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}
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2019-09-30 02:40:12 +02:00
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func isDark() -> Bool {
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2021-04-03 17:40:46 +02:00
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guard let luminanceType = getLuminanceType() else {
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2020-03-13 11:43:17 +01:00
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return false
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}
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return luminanceType == .dark
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}
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2021-04-03 17:40:46 +02:00
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fileprivate func getLuminanceType() -> ImageLuminanceType? {
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// This has been rewritten with information from https://christianselig.com/2021/04/efficient-average-color/
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// First, resize the image. We do this for two reasons, 1) less pixels to deal with means faster
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// calculation and a resized image still has the "gist" of the colors, and 2) the image we're dealing
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// with may come in any of a variety of color formats (CMYK, ARGB, RGBA, etc.) which complicates things,
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// and redrawing it normalizes that into a base color format we can deal with.
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// 40x40 is a good size to resize to still preserve quite a bit of detail but not have too many pixels
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// to deal with. Aspect ratio is irrelevant for just finding average color.
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let size = CGSize(width: 40, height: 40)
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let width = Int(size.width)
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let height = Int(size.height)
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let totalPixels = width * height
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let colorSpace = CGColorSpaceCreateDeviceRGB()
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// ARGB format
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let bitmapInfo: UInt32 = CGBitmapInfo.byteOrder32Little.rawValue | CGImageAlphaInfo.premultipliedFirst.rawValue
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// 8 bits for each color channel, we're doing ARGB so 32 bits (4 bytes) total, and thus if the image is n pixels wide,
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// and has 4 bytes per pixel, the total bytes per row is 4n. That gives us 2^8 = 256 color variations for each RGB channel
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// or 256 * 256 * 256 = ~16.7M color options in total. That seems like a lot, but lots of HDR movies are in 10 bit, which
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// is (2^10)^3 = 1 billion color options!
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guard let context = CGContext(data: nil, width: width, height: height, bitsPerComponent: 8, bytesPerRow: width * 4, space: colorSpace, bitmapInfo: bitmapInfo) else { return nil }
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// Draw our resized image
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context.draw(self, in: CGRect(origin: .zero, size: size))
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guard let pixelBuffer = context.data else { return nil }
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// Bind the pixel buffer's memory location to a pointer we can use/access
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let pointer = pixelBuffer.bindMemory(to: UInt32.self, capacity: width * height)
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2019-10-30 02:48:07 +01:00
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var totalLuminance = 0.0
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2019-09-30 02:40:12 +02:00
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2021-04-03 17:40:46 +02:00
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// Column of pixels in image
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for x in 0 ..< width {
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// Row of pixels in image
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for y in 0 ..< height {
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// To get the pixel location just think of the image as a grid of pixels, but stored as one long row
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// rather than columns and rows, so for instance to map the pixel from the grid in the 15th row and 3
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// columns in to our "long row", we'd offset ourselves 15 times the width in pixels of the image, and
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// then offset by the amount of columns
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let pixel = pointer[(y * width) + x]
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let r = red(for: pixel)
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let g = green(for: pixel)
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let b = blue(for: pixel)
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let luminance = (0.299 * Double(r) + 0.587 * Double(g) + 0.114 * Double(b))
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2020-01-11 20:25:31 +01:00
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totalLuminance += luminance
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}
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2019-09-30 02:40:12 +02:00
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}
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2021-04-03 17:40:46 +02:00
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let avgLuminance = totalLuminance / Double(totalPixels)
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2020-03-13 11:43:17 +01:00
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if totalLuminance == 0 || avgLuminance < 40 {
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return .dark
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2020-03-13 16:45:02 +01:00
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} else if avgLuminance > 180 {
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2020-03-13 11:43:17 +01:00
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return .bright
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2020-01-11 20:25:31 +01:00
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} else {
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2020-03-13 11:43:17 +01:00
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return .regular
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2020-01-11 20:25:31 +01:00
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}
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2019-09-30 02:40:12 +02:00
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}
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2021-04-03 17:40:46 +02:00
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private func red(for pixelData: UInt32) -> UInt8 {
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return UInt8((pixelData >> 16) & 255)
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}
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private func green(for pixelData: UInt32) -> UInt8 {
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return UInt8((pixelData >> 8) & 255)
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}
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private func blue(for pixelData: UInt32) -> UInt8 {
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return UInt8((pixelData >> 0) & 255)
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}
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2019-09-30 02:40:12 +02:00
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}
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2019-11-17 02:44:01 +01:00
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enum IconSize: Int, CaseIterable {
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case small = 1
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case medium = 2
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case large = 3
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private static let smallDimension = CGFloat(integerLiteral: 24)
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private static let mediumDimension = CGFloat(integerLiteral: 36)
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private static let largeDimension = CGFloat(integerLiteral: 48)
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var size: CGSize {
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switch self {
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case .small:
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return CGSize(width: IconSize.smallDimension, height: IconSize.smallDimension)
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case .medium:
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return CGSize(width: IconSize.mediumDimension, height: IconSize.mediumDimension)
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case .large:
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return CGSize(width: IconSize.largeDimension, height: IconSize.largeDimension)
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}
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}
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}
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