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Make DrawingContext initializer failable

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This commit is contained in:
Ali
2022-11-15 13:40:31 +04:00
parent 59e2c74d42
commit f07c30bd5b
39 changed files with 624 additions and 415 deletions
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14
submodules/ImageTransparency/Sources/ImageTransparency.swift
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@@ -61,12 +61,14 @@ public func imageHasTransparency(_ cgImage: CGImage) -> Bool {
return false
}
private func scaledDrawingContext(_ cgImage: CGImage, maxSize: CGSize) -> DrawingContext {
private func scaledDrawingContext(_ cgImage: CGImage, maxSize: CGSize) -> DrawingContext? {
var size = CGSize(width: cgImage.width, height: cgImage.height)
if (size.width > maxSize.width && size.height > maxSize.height) {
size = size.aspectFilled(maxSize)
}
let context = DrawingContext(size: size, scale: 1.0, clear: true)
guard let context = DrawingContext(size: size, scale: 1.0, clear: true) else {
return nil
}
context.withFlippedContext { context in
context.draw(cgImage, in: CGRect(origin: CGPoint(), size: size))
}
@@ -81,7 +83,9 @@ public func imageRequiresInversion(_ cgImage: CGImage) -> Bool {
return false
}
let context = scaledDrawingContext(cgImage, maxSize: CGSize(width: 128.0, height: 128.0))
guard let context = scaledDrawingContext(cgImage, maxSize: CGSize(width: 128.0, height: 128.0)) else {
return false
}
if let cgImage = context.generateImage()?.cgImage, let (histogramBins, alphaBinIndex) = generateHistogram(cgImage: cgImage) {
var hasAlpha = false
for i in 0 ..< 255 {
@@ -92,7 +96,9 @@ public func imageRequiresInversion(_ cgImage: CGImage) -> Bool {
}
if hasAlpha {
let probingContext = DrawingContext(size: CGSize(width: cgImage.width, height: cgImage.height))
guard let probingContext = DrawingContext(size: CGSize(width: cgImage.width, height: cgImage.height)) else {
return false
}
probingContext.withContext { c in
c.draw(cgImage, in: CGRect(origin: CGPoint(), size: probingContext.size))
}