Merge pull request #3 from signalapp/gte/ios14

Fixes compile with Xcode 12.

Swift/BlurHashDecode.swift

@@ -125,6 +125,24 @@ extension String {
 		}
 		return value
 	}
+
+    var averageLinearRgb: (Float, Float, Float)? {
+        guard count >= 6 else { return nil }
+
+        let sizeFlag = String(self[0]).decode83()
+        let numY = (sizeFlag / 9) + 1
+        let numX = (sizeFlag % 9) + 1
+
+        guard count == 4 + 2 * numX * numY else { return nil }
+
+        return decodeDC(String(self[2 ..< 6]).decode83())
+    }
+
+    // https://github.com/signalapp/blurhash/blob/addPodspec/Swift/BlurHashKit/ColourProbes.swift#L59
+    public var isDarkBlurHash: Bool? {
+        guard let rgb = averageLinearRgb else { return nil }
+        return rgb.0 * 0.299 + rgb.1 * 0.587 + rgb.2 * 0.114 < 0.5
+    }
 }
 
 private extension String {

Swift/BlurHashEncode.swift

@@ -21,7 +21,9 @@ extension UIImage {
             for x in 0 ..< components.0 {
                 let normalisation: Float = (x == 0 && y == 0) ? 1 : 2
                 let factor = multiplyBasisFunction(pixels: pixels, width: width, height: height, bytesPerRow: bytesPerRow, bytesPerPixel: cgImage.bitsPerPixel / 8, pixelOffset: 0) {
-                    normalisation * cos(Float.pi * Float(x) * $0 / Float(width)) * cos(Float.pi * Float(y) * $1 / Float(height))
+                    let horizontal = cos(Float.pi * Float(x) * $0 / Float(width))
+                    let vertical = cos(Float.pi * Float(y) * $1 / Float(height))
+                    return normalisation * horizontal * vertical
                 }
                 factors.append(factor)
             }

blurhash.podspec

@@ -0,0 +1,132 @@
+#
+#  Be sure to run `pod spec lint blurhash.podspec' to ensure this is a
+#  valid spec and to remove all comments including this before submitting the spec.
+#
+#  To learn more about Podspec attributes see https://guides.cocoapods.org/syntax/podspec.html
+#  To see working Podspecs in the CocoaPods repo see https://github.com/CocoaPods/Specs/
+#
+
+Pod::Spec.new do |spec|
+
+  # ―――  Spec Metadata  ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  These will help people to find your library, and whilst it
+  #  can feel like a chore to fill in it's definitely to your advantage. The
+  #  summary should be tweet-length, and the description more in depth.
+  #
+
+  spec.name         = "blurhash"
+  spec.version      = "0.0.1"
+  spec.summary      = "A very compact representation of a placeholder for an image."
+
+  spec.description  = <<-DESC
+A pure-Swift library for generating and decoding very compact image placeholders.
+                   DESC
+
+  spec.homepage     = "https://github.com/signalapp/blurhash"
+
+
+  # ―――  Spec License  ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Licensing your code is important. See https://choosealicense.com for more info.
+  #  CocoaPods will detect a license file if there is a named LICENSE*
+  #  Popular ones are 'MIT', 'BSD' and 'Apache License, Version 2.0'.
+  #
+
+  # spec.license      = "MIT (example)"
+  spec.license      = { :type => "MIT", :file => "Swift/License.txt" }
+
+
+  # ――― Author Metadata  ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Specify the authors of the library, with email addresses. Email addresses
+  #  of the authors are extracted from the SCM log. E.g. $ git log. CocoaPods also
+  #  accepts just a name if you'd rather not provide an email address.
+  #
+  #  Specify a social_media_url where others can refer to, for example a twitter
+  #  profile URL.
+  #
+
+  spec.author             = { "Dag Ågren" => "paracelsus@gmail.com" }
+  spec.social_media_url   = "https://github.com/woltapp"
+
+  # ――― Platform Specifics ――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  If this Pod runs only on iOS or OS X, then specify the platform and
+  #  the deployment target. You can optionally include the target after the platform.
+  #
+
+  # spec.platform     = :ios
+  spec.platform     = :ios, "8.0"
+
+  #  When using multiple platforms
+  # spec.ios.deployment_target = "5.0"
+  # spec.osx.deployment_target = "10.7"
+  # spec.watchos.deployment_target = "2.0"
+  # spec.tvos.deployment_target = "9.0"
+
+  spec.swift_versions = ['4.0', '4.2']
+
+  # ――― Source Location ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Specify the location from where the source should be retrieved.
+  #  Supports git, hg, bzr, svn and HTTP.
+  #
+
+  # The upstream repo has no tags.  A podspec requires a tag.
+  spec.source       = { :git => "https://github.com/signalapp/blurhash.git", :tag => "0.0.1" }
+	
+
+  # ――― Source Code ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  CocoaPods is smart about how it includes source code. For source files
+  #  giving a folder will include any swift, h, m, mm, c & cpp files.
+  #  For header files it will include any header in the folder.
+  #  Not including the public_header_files will make all headers public.
+  #
+
+  spec.source_files  = "Classes", "Swift/*.{swift}"
+  # spec.exclude_files = "Classes/Exclude"
+
+  # spec.public_header_files = "Classes/**/*.h"
+
+
+  # ――― Resources ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  A list of resources included with the Pod. These are copied into the
+  #  target bundle with a build phase script. Anything else will be cleaned.
+  #  You can preserve files from being cleaned, please don't preserve
+  #  non-essential files like tests, examples and documentation.
+  #
+
+  # spec.resource  = "icon.png"
+  # spec.resources = "Resources/*.png"
+
+  # spec.preserve_paths = "FilesToSave", "MoreFilesToSave"
+
+
+  # ――― Project Linking ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  Link your library with frameworks, or libraries. Libraries do not include
+  #  the lib prefix of their name.
+  #
+
+  # spec.framework  = "SomeFramework"
+  # spec.frameworks = "SomeFramework", "AnotherFramework"
+
+  # spec.library   = "iconv"
+  # spec.libraries = "iconv", "xml2"
+
+
+  # ――― Project Settings ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
+  #
+  #  If your library depends on compiler flags you can set them in the xcconfig hash
+  #  where they will only apply to your library. If you depend on other Podspecs
+  #  you can include multiple dependencies to ensure it works.
+
+  # spec.requires_arc = true
+
+  # spec.xcconfig = { "HEADER_SEARCH_PATHS" => "$(SDKROOT)/usr/include/libxml2" }
+  # spec.dependency "JSONKit", "~> 1.4"
+
+end