fix(mobile): show 10-bit heic and avif originals on ios (#32821)

(cherry picked from commit ca25e8becc4bfb18d63ca7920d26a984eae0e16f)

mobile/ios/Runner/Images/ImageProcessing.swift

@@ -1,3 +1,4 @@
+import Accelerate
 import Foundation
 
 enum ImageProcessing {
@@ -11,4 +12,22 @@ enum ImageProcessing {
   static let cancelledResult = Result<[String: Int64]?, any Error>.success(nil)
   // Impeller shrinks each side to the GPU texture limit on its own, which squishes long images.
   static let maxPixelSize = 16384
+
+  static func rgbaBuffer(_ image: CGImage, format: vImage_CGImageFormat) throws -> vImage_Buffer {
+    guard image.bitsPerComponent == 10 else {
+      return try vImage_Buffer(cgImage: image, format: format)
+    }
+
+    // vImage can't convert packed 10-bit images.
+    let buffer = try vImage_Buffer(width: image.width, height: image.height, bitsPerPixel: format.bitsPerPixel)
+    guard let context = CGContext(data: buffer.data, width: image.width, height: image.height, bitsPerComponent: Int(format.bitsPerComponent), bytesPerRow: buffer.rowBytes, space: format.colorSpace.takeUnretainedValue(), bitmapInfo: format.bitmapInfo.rawValue) else {
+      buffer.free()
+      throw vImage.Error.invalidImageFormat
+    }
+
+    context.setRenderingIntent(format.renderingIntent)
+    context.setBlendMode(.copy)
+    context.draw(image, in: CGRect(x: 0, y: 0, width: image.width, height: image.height))
+    return buffer
+  }
 }

mobile/ios/Runner/Images/LocalImagesImpl.swift

@@ -165,7 +165,7 @@ class LocalImageApiImpl: LocalImageApi {
       }
 
       do {
-        let buffer = try vImage_Buffer(cgImage: cgImage, format: Self.rgbaFormat)
+        let buffer = try ImageProcessing.rgbaBuffer(cgImage, format: Self.rgbaFormat)
 
         if request.isCancelled {
           buffer.free()

mobile/ios/Runner/Images/RemoteImagesImpl.swift

@@ -148,7 +148,7 @@ class RemoteImageApiImpl: NSObject, RemoteImageApi {
       }
 
       do {
-        let buffer = try vImage_Buffer(cgImage: cgImage, format: rgbaFormat)
+        let buffer = try ImageProcessing.rgbaBuffer(cgImage, format: rgbaFormat)
 
         if request.isCancelled {
           buffer.free()