From c875d408a7f57647fe1c45d7ab2a0ecbeb28f784 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 24 Aug 2016 21:20:53 +0530
Subject: [PATCH] Fix high DPI rendering of covers in book details panel

---
 src/calibre/gui2/book_details.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/calibre/gui2/book_details.py b/src/calibre/gui2/book_details.py
index a5ac8f6d17..4e3c37afad 100644
--- a/src/calibre/gui2/book_details.py
+++ b/src/calibre/gui2/book_details.py
@@ -289,8 +289,10 @@ class CoverView(QWidget):  # {{{
         target = QRect(x, y, width, height)
         p = QPainter(self)
         p.setRenderHints(QPainter.Antialiasing | QPainter.SmoothPixmapTransform)
-        p.drawPixmap(target, self.pixmap.scaled(target.size(),
-            Qt.KeepAspectRatio, Qt.SmoothTransformation))
+        dpr = self.devicePixelRatio()
+        spmap = self.pixmap.scaled(target.size() * dpr, Qt.KeepAspectRatio, Qt.SmoothTransformation)
+        spmap.setDevicePixelRatio(dpr)
+        p.drawPixmap(target, spmap)
         if gprefs['bd_overlay_cover_size']:
             sztgt = target.adjusted(0, 0, 0, -4)
             f = p.font()