From: Po Lu <luangruo@yahoo.com>
Date: Fri, 18 Feb 2022 07:48:50 +0000 (+0800)
Subject: Fix blurry text on multiple scale monitor setups
X-Git-Tag: emacs-29.0.90~2252
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=ef1dfd2261f717136896b73dc96e7c3fbd72c14d;p=emacs.git

Fix blurry text on multiple scale monitor setups

* src/pgtkterm.c (pgtk_copy_bits): Preserve window scale factor
on temporary surface.  (bug#54040)
---

diff --git a/src/pgtkterm.c b/src/pgtkterm.c
index 65408801cfd..54b65ac54e4 100644
--- a/src/pgtkterm.c
+++ b/src/pgtkterm.c
@@ -2927,6 +2927,7 @@ pgtk_copy_bits (struct frame *f, cairo_rectangle_t *src_rect,
   cairo_t *cr;
   GdkWindow *window;
   cairo_surface_t *surface;	/* temporary surface */
+  int scale;
 
   window = gtk_widget_get_window (FRAME_GTK_WIDGET (f));
 
@@ -2936,6 +2937,9 @@ pgtk_copy_bits (struct frame *f, cairo_rectangle_t *src_rect,
 				       FRAME_CR_SURFACE_DESIRED_HEIGHT
 				       (f));
 
+  scale = gtk_widget_get_scale_factor (FRAME_GTK_WIDGET (f));
+  cairo_surface_set_device_scale (surface, scale, scale);
+
   cr = cairo_create (surface);
   cairo_set_source_surface (cr, FRAME_CR_SURFACE (f), -src_rect->x,
 			    -src_rect->y);