From 493bd84ccaac973c7e86e90bfcccb3e37955cd52 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 8 May 2016 19:43:29 -0400
Subject: fix redrawing the window under the cursor after it moves

---
 src/display.c | 18 ++++++++++++++++--
 src/display.h |  1 +
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/display.c b/src/display.c
index 83ee9d9..4e6b510 100644
--- a/src/display.c
+++ b/src/display.c
@@ -9,6 +9,7 @@
 
 static void runes_display_recalculate_font_metrics(
     RunesDisplay *display, char *font_name);
+static void runes_display_repaint_screen(RunesTerm *t);
 static int runes_display_draw_cell(RunesTerm *t, int row, int col);
 static void runes_display_paint_rectangle(
     RunesTerm *t, cairo_t *cr, cairo_pattern_t *pattern,
@@ -52,6 +53,7 @@ void runes_display_draw_screen(RunesTerm *t)
     int r, rows;
 
     if (!t->scr->dirty && !display->dirty) {
+        runes_display_repaint_screen(t);
         return;
     }
 
@@ -71,8 +73,9 @@ void runes_display_draw_screen(RunesTerm *t)
         }
     }
 
-    cairo_pop_group_to_source(display->cr);
-    cairo_paint(display->cr);
+    cairo_pattern_destroy(display->buffer);
+    display->buffer = cairo_pop_group(display->cr);
+    runes_display_repaint_screen(t);
 
     t->scr->dirty = 0;
     display->dirty = 0;
@@ -186,6 +189,7 @@ int runes_display_loc_is_between(
 
 void runes_display_cleanup(RunesDisplay *display)
 {
+    cairo_pattern_destroy(display->buffer);
     g_object_unref(display->layout);
 }
 
@@ -223,6 +227,16 @@ static void runes_display_recalculate_font_metrics(
     }
 }
 
+static void runes_display_repaint_screen(RunesTerm *t)
+{
+    RunesDisplay *display = t->display;
+
+    if (display->buffer) {
+        cairo_set_source(display->cr, display->buffer);
+        cairo_paint(display->cr);
+    }
+}
+
 static int runes_display_draw_cell(RunesTerm *t, int row, int col)
 {
     RunesDisplay *display = t->display;
diff --git a/src/display.h b/src/display.h
index 4230fc4..427ddb3 100644
--- a/src/display.h
+++ b/src/display.h
@@ -7,6 +7,7 @@
 
 struct runes_display {
     cairo_t *cr;
+    cairo_pattern_t *buffer;
     PangoLayout *layout;
 
     int row_visible_offset;
-- 
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