From fe5abd6edabf5197b0bb3c105484ed5ad016591f Mon Sep 17 00:00:00 2001
From: Vladimir Privezenov <vladimir.privezenov@onlyoffice.com>
Date: Sun, 29 Jun 2025 22:38:09 +0300
Subject: [PATCH] Add alphaMod mod

---
 common/Drawings/Format/Format.js      |  4 ++++
 tests/common/color-mods/color-mods.js | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/common/Drawings/Format/Format.js b/common/Drawings/Format/Format.js
index d6e74f7348..2493fd1be6 100644
--- a/common/Drawings/Format/Format.js
+++ b/common/Drawings/Format/Format.js
@@ -2073,6 +2073,10 @@
 						RGBA.A = 255 * val;
 						break;
 					}
+					case "alphaMod": {
+						RGBA.A = RGBA.A * val;
+						break;
+					}
 					case"blue": {
 						RGBA.B = this.CrgbtoRgbColor(val);
 						break;
diff --git a/tests/common/color-mods/color-mods.js b/tests/common/color-mods/color-mods.js
index 3d4c60ca73..bfd3fc8ce3 100644
--- a/tests/common/color-mods/color-mods.js
+++ b/tests/common/color-mods/color-mods.js
@@ -17325,4 +17325,20 @@ function mod(name, value) {
 		testResult = test(rgb(68, 114, 196, 255),[mod("alpha", -100000)],rgb(68, 114, 196, 0));
 		fTestFunction(testResult);
 	});
+	QUnit.test("Test alpha mod", (assert) => {
+		const fTestFunction = assertTest(assert);
+		let testResult;
+		testResult = test(rgb(68, 114, 196, 128),[mod("alphaMod", 50000)],rgb(68, 114, 196, 64));
+		fTestFunction(testResult);
+		testResult = test(rgb(68, 114, 196, 128),[mod("alphaMod", 0)],rgb(68, 114, 196, 0));
+		fTestFunction(testResult);
+		testResult = test(rgb(68, 114, 196, 128),[mod("alphaMod", 25000)],rgb(68, 114, 196, 31));
+		fTestFunction(testResult);
+		testResult = test(rgb(68, 114, 196, 128),[mod("alphaMod", 100000)],rgb(68, 114, 196, 128));
+		fTestFunction(testResult);
+		testResult = test(rgb(68, 114, 196, 128),[mod("alphaMod", -50000)],rgb(68, 114, 196, 0));
+		fTestFunction(testResult);
+		testResult = test(rgb(68, 114, 196, 128),[mod("alphaMod", 200000)],rgb(68, 114, 196, 255));
+		fTestFunction(testResult);
+	});
 });