faster + benchmark

src/pixie/images.nim

@@ -506,7 +506,7 @@ proc drawCorrect(
       dy = matInv * vec2(0 + h, 1 + h) - p
       minFilterBy2 = max(dx.length, dy.length)
 
-    while minFilterBy2 > 2:
+    while minFilterBy2 >= 2:
       b = b.minifyBy2()
       dx /= 2
       dy /= 2
@@ -563,7 +563,7 @@ proc drawUber(a, b: Image | Mask, mat = mat3(), blendMode = bmNormal) =
     minFilterBy2 = max(dx.length, dy.length)
     b = b
 
-  while minFilterBy2 > 2.0:
+  while minFilterBy2 >= 2.0:
     b = b.minifyBy2()
     p /= 2
     dx /= 2

tests/benchmark_images.nim

@@ -33,6 +33,8 @@ timeIt "minifyBy2":
   let minified = image.minifyBy2()
   doAssert minified[0, 0] == rgba(63, 127, 191, 191)
 
+reset()
+
 timeIt "magnifyBy2":
   let minified = image.magnifyBy2()
   doAssert minified[0, 0] == rgba(63, 127, 191, 191)

tests/benchmark_images_draw.nim

@@ -44,6 +44,17 @@ block:
     a.draw(b, translate(vec2(25.2, 25.2)), bmNormal)
     keep(b)
 
+block:
+  let
+    a = newImage(1000, 1000)
+    b = newImage(500, 500)
+  a.fill(rgba(255, 0, 0, 255))
+  b.fill(rgba(0, 255, 0, 255))
+
+  timeIt "draw big-on-bigger bmNormal scale(0.5)":
+    a.draw(b, translate(vec2(25, 25)) * scale(vec2(0.5, 0.5)), bmNormal)
+    keep(b)
+
 block:
   let
     a = newImage(100, 100)