From ca6dd1bb90153dbe03195ca246a1c541ec7f1aac Mon Sep 17 00:00:00 2001
From: Elias Batek <desisma@heidel.beer>
Date: Sat, 25 May 2024 01:58:36 +0200
Subject: [PATCH] Implement "divide" blend-mode

---
 pixmappaint.d | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/pixmappaint.d b/pixmappaint.d
index 98e75c9..aff06c8 100644
--- a/pixmappaint.d
+++ b/pixmappaint.d
@@ -463,6 +463,8 @@ enum BlendMode {
 
 	darken,
 	lighten,
+
+	divide,
 }
 
 ///
@@ -533,6 +535,17 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
 	)(target, source);
 }
 
+/// ditto
+void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
+	ref Pixel target,
+	const Pixel source,
+) if (mode == Blend.divide) {
+
+	return alphaBlend!(accuracy,
+		(b, f) => (f == 0) ? ubyte(0xFF) : clamp255(0xFF * b / f)
+	)(target, source);
+}
+
 /++
 	Blends the pixel data of `source` into `target`.