Use CoreGraphics to draw instead of SwifTUI2.0.0

1 files changed, 51 insertions, 0 deletions

diff --git a/Sources/Patterns/TileImage.swift b/Sources/Patterns/TileImage.swift
new file mode 100644
index 0000000..4ef84da
--- /dev/null
+++ b/Sources/Patterns/TileImage.swift
@@ -0,0 +1,51 @@
+import CoreGraphics
+
+struct TileImage {
+  static func image(_ design: TileDesign, pixelSize: CGFloat, foregroundColor: CGColor? = nil, backgroundColor: CGColor? = nil) -> CGImage {
+    
+    let fg = foregroundColor ?? .init(red: 0, green: 0, blue: 0, alpha: 255)
+    let bg = backgroundColor ?? .init(red: 255, green: 255, blue: 255, alpha: 255)
+    
+    // Convert the array to image data
+    
+    let pixels: [UInt8] = design.pixels().map({ x in
+      var color = bg
+      if x == 0 {
+        color = fg
+      }
+      let components = color.components ?? [0,0,0,1]
+      return components.map({ c in
+        UInt8(round(c * 255))
+      })
+    }).reduce([], +)
+    
+    // Generate the image
+    
+    let pointer = UnsafeMutablePointer<UInt8>.allocate(capacity: pixels.count)
+    pointer.initialize(from: pixels, count: pixels.count)
+    let width = 8.0
+    let height = 8.0
+    let bitsPerComponent = 8
+    let componentCount = 4
+    let bitsPerPixel = bitsPerComponent * componentCount
+    let colorSpace = CGColorSpaceCreateDeviceRGB()
+    
+    let bitmapInfo = CGBitmapInfo([.byteOrderDefault, CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)])
+    let provider = CGDataProvider(dataInfo: nil, data: pointer, size: Int(width * height * 4)) { _, _, _ in
+      return
+    }!
+    
+    let image = CGImage(
+      width: Int(width),
+      height: Int(height),
+      bitsPerComponent: bitsPerComponent,
+      bitsPerPixel: bitsPerPixel,
+      bytesPerRow: Int(width) * componentCount,
+      space: colorSpace,
+      bitmapInfo: bitmapInfo,
+      provider: provider,
+      decode: nil, shouldInterpolate: false, intent: CGColorRenderingIntent.defaultIntent)!
+    
+    return image.resize(size: CGSize(width: width * pixelSize, height: height * pixelSize)) ?? image
+  }
+}