From 2e63c6103e3b23bfcd65dcb8afb19c020511b168 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 5 Sep 2022 18:55:17 +0400
Subject: [PATCH] Allow strictly blurring images with alpha.

---
 ui/image/image_prepare.cpp | 4 ++--
 ui/image/image_prepare.h   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/ui/image/image_prepare.cpp b/ui/image/image_prepare.cpp
index 5419eb4..e7c48e9 100644
--- a/ui/image/image_prepare.cpp
+++ b/ui/image/image_prepare.cpp
@@ -506,7 +506,7 @@ ReadResult Read(ReadArgs &&args) {
 		: Option::None);
 }
 
-QImage Blur(QImage &&image) {
+QImage Blur(QImage &&image, bool ignoreAlpha) {
 	if (image.isNull()) {
 		return std::move(image);
 	}
@@ -532,7 +532,7 @@ QImage Blur(QImage &&image) {
 	if (radius >= 16 || div >= w || div >= h || stride > w * 4) {
 		return std::move(image);
 	}
-	const auto withalpha = image.hasAlphaChannel();
+	const auto withalpha = !ignoreAlpha && image.hasAlphaChannel();
 	if (withalpha) {
 		auto smaller = QImage(image.size(), image.format());
 		{
diff --git a/ui/image/image_prepare.h b/ui/image/image_prepare.h
index 2efb6a7..b1a165d 100644
--- a/ui/image/image_prepare.h
+++ b/ui/image/image_prepare.h
@@ -100,7 +100,7 @@ inline constexpr auto is_flag_type(Option) { return true; };
 	ImageRoundRadius radius,
 	RectParts corners = RectPart::AllCorners);
 
-[[nodiscard]] QImage Blur(QImage &&image);
+[[nodiscard]] QImage Blur(QImage &&image, bool ignoreAlpha = false);
 [[nodiscard]] QImage Round(
 	QImage &&image,
 	ImageRoundRadius radius,