more benchmarks

tests/benchmark_images.nim

@@ -17,6 +17,25 @@ proc invertOriginal(a: Image) =
       rgba.a = 255 - rgba.a
       a.setRgbaUnsafe(x, y, rgba)
 
+proc applyOpacityOriginal(a: Image, opacity: float32): Image =
+  result = newImage(a.width, a.height)
+  let op = (255 * opacity).uint32
+  for y in 0 ..< a.height:
+    for x in 0 ..< a.width:
+      var rgba = a.getRgbaUnsafe(x, y)
+      rgba.a = ((rgba.a.uint32 * op) div 255).clamp(0, 255).uint8
+      result.setRgbaUnsafe(x, y, rgba)
+
+proc sharpOpacityOriginal(a: Image): Image =
+  result = newImage(a.width, a.height)
+  for y in 0 ..< a.height:
+    for x in 0 ..< a.width:
+      var rgba = a.getRgbaUnsafe(x, y)
+      if rgba.a == 0:
+        result.setRgbaUnsafe(x, y, rgba(0, 0, 0, 0))
+      else:
+        result.setRgbaUnsafe(x, y, rgba(255, 255, 255, 255))
+
 timeIt "fillOriginal":
   var a = newImage(2560, 1440)
   for i in 0 ..< iterations:
@@ -38,3 +57,23 @@ timeIt "invert":
   var a = newImage(2560, 1440)
   for i in 0 ..< iterations:
     a.invert()
+
+timeIt "applyOpacityOriginal":
+  var a = newImage(2560, 1440)
+  for i in 0 ..< iterations:
+    a = a.applyOpacityOriginal(0.5)
+
+timeIt "applyOpacity":
+  var a = newImage(2560, 1440)
+  for i in 0 ..< iterations:
+    a = a.applyOpacity(0.5)
+
+timeIt "sharpOpacityOriginal":
+  var a = newImage(2560, 1440)
+  for i in 0 ..< iterations:
+    a = a.sharpOpacityOriginal()
+
+timeIt "sharpOpacity":
+  var a = newImage(2560, 1440)
+  for i in 0 ..< iterations:
+    a = a.sharpOpacity()