mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2026-02-05 23:05:01 +08:00
caf7700e2c
* implement safe bounded data Access and cancellation supporting URLSession downloadTask * declare specific SpineError type declaring conformance to Error on String is discouraged, and Creating own Error type is recommended * use explicit Error initializing rather than casing syntax (apply requested change)
55 lines
2.2 KiB
Swift
55 lines
2.2 KiB
Swift
import Foundation
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import UIKit
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import CoreGraphics
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public extension SkeletonDrawableWrapper {
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/// Render the ``Skeleton`` to a `CGImage`
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///
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/// Parameters:
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/// - size: The size of the `CGImage` that should be rendered.
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/// - backgroundColor: the background color of the image
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/// - scaleFactor: The scale factor. Set this to `UIScreen.main.scale` if you want to show the image in a view
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func renderToImage(size: CGSize, backgroundColor: UIColor, scaleFactor: CGFloat = 1) throws -> CGImage? {
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let spineView = SpineUIView(
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controller: SpineController(disposeDrawableOnDeInit: false), // Doesn't own the drawable
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backgroundColor: backgroundColor
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)
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spineView.frame = CGRect(origin: .zero, size: size)
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spineView.isPaused = false
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spineView.enableSetNeedsDisplay = false
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spineView.framebufferOnly = false
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spineView.contentScaleFactor = scaleFactor
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try spineView.load(drawable: self)
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spineView.renderer?.waitUntilCompleted = true
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spineView.delegate?.draw(in: spineView)
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guard let texture = spineView.currentDrawable?.texture else {
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throw SpineError("Could not read texture.")
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}
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let width = texture.width
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let height = texture.height
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let rowBytes = width * 4
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let data = UnsafeMutableRawPointer.allocate(byteCount: rowBytes * height, alignment: MemoryLayout<UInt8>.alignment)
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defer {
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data.deallocate()
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}
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let region = MTLRegionMake2D(0, 0, width, height)
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texture.getBytes(data, bytesPerRow: rowBytes, from: region, mipmapLevel: 0)
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let bitmapInfo = CGBitmapInfo(
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rawValue: CGImageAlphaInfo.premultipliedFirst.rawValue
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).union(.byteOrder32Little)
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let colorSpace = CGColorSpaceCreateDeviceRGB()
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guard let context = CGContext(data: data, width: width, height: height, bitsPerComponent: 8, bytesPerRow: rowBytes, space: colorSpace, bitmapInfo: bitmapInfo.rawValue),
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let cgImage = context.makeImage() else {
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throw SpineError("Could not create image.")
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}
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return cgImage
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}
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}
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