From 3aa76886d0e9d8144abf1a80d7339d6861950cfb Mon Sep 17 00:00:00 2001
From: xiaoyifang <yifang.xiao@outlook.com>
Date: Sun, 23 Jan 2022 11:36:58 +0800
Subject: [PATCH] high api: draw image with antialiasing

---
 bgl.cc         | 1 +
 dictionary.cc  | 2 +-
 extlineedit.cc | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/bgl.cc b/bgl.cc
index 2a9a8f53..c62596c7 100644
--- a/bgl.cc
+++ b/bgl.cc
@@ -350,6 +350,7 @@ namespace
           result.fill( 0 ); // Black transparent
 
           QPainter painter( &result );
+          painter.setRenderHint(QPainter::RenderHint::Antialiasing);
 
           painter.drawImage( QPoint( img.width() == max ? 0 : ( max - img.width() ) / 2,
                                      img.height() == max ? 0 : ( max - img.height() ) / 2 ),
diff --git a/dictionary.cc b/dictionary.cc
index 53f61698..4a185564 100644
--- a/dictionary.cc
+++ b/dictionary.cc
@@ -257,7 +257,7 @@ bool Class::loadIconFromFile( QString const & _filename, bool isFullName )
       result.fill( 0 ); // Black transparent
 
       QPainter painter( &result );
-
+      painter.setRenderHint(QPainter::RenderHint::Antialiasing);
       painter.drawImage( QPoint( img.width() == max ? 0 : ( max - img.width() ) / 2,
                                  img.height() == max ? 0 : ( max - img.height() ) / 2 ),
                          img );
diff --git a/extlineedit.cc b/extlineedit.cc
index 1fb445fa..36bb783b 100644
--- a/extlineedit.cc
+++ b/extlineedit.cc
@@ -161,7 +161,7 @@ IconButton::IconButton(QWidget *parent)
 void IconButton::paintEvent(QPaintEvent *)
 {
     QPainter painter(this);
-
+    painter.setRenderHint(QPainter::RenderHint::Antialiasing);
     QRect pixmapRect = QRect(0, 0, m_pixmap.width(), m_pixmap.height());
     pixmapRect.moveCenter(rect().center());