From 8d0eb205c0d4a7486a18f95eb106a83bb0fb0875 Mon Sep 17 00:00:00 2001
From: Fabian Gundlach <git@fabiangundlach.org>
Date: Mon, 15 Feb 2021 22:23:09 +0100
Subject: [PATCH] Brute force redrawing

---
 src/renderer.cpp | 18 +++++++++++-------
 src/renderer.h   |  1 +
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/renderer.cpp b/src/renderer.cpp
index 46c12cf..d1dbd33 100644
--- a/src/renderer.cpp
+++ b/src/renderer.cpp
@@ -75,6 +75,14 @@ void DrawingLayerPicture::stroke_added(ptr_Stroke stroke) {
 		draw_stroke(stroke);
 }
 
+void DrawingLayerPicture::redraw(QRect rect) {
+	cr->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
+	cr->clip();
+	set_transparent();
+	draw_strokes();
+	emit update(rect);
+}
+
 void DrawingLayerPicture::stroke_deleted(ptr_Stroke stroke) {
 	CairoGroup cg(cr);
 	PathStroke* path_stroke = convert_variant<PathStroke*>(stroke);
@@ -85,11 +93,7 @@ void DrawingLayerPicture::stroke_deleted(ptr_Stroke stroke) {
 	// Forget the deleted path
 	cr->begin_new_path();
 	// Clip to only redraw the bounding rectangle of the deleted stroke.
-	cr->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
-	cr->clip();
-	set_transparent();
-	draw_strokes();
-	emit update(rect);
+	redraw(rect);
 }
 
 void DrawingLayerPicture::setup_stroke(ptr_Stroke stroke) {
@@ -126,8 +130,8 @@ void DrawingLayerPicture::draw_line(Point a, Point b, ptr_Stroke stroke) {
 	cr->move_to(a.x * unit2pixel, a.y * unit2pixel);
 	cr->line_to(b.x * unit2pixel, b.y * unit2pixel);
 	QRect rect = stroke_extents();
-	cr->stroke();
-	emit update(rect);
+	cr->begin_new_path();
+	redraw(rect);
 }
 
 QRect DrawingLayerPicture::stroke_extents() {
diff --git a/src/renderer.h b/src/renderer.h
index 4c1c0c6..ae182a6 100644
--- a/src/renderer.h
+++ b/src/renderer.h
@@ -85,6 +85,7 @@ class DrawingLayerPicture : public LayerPicture {
 
 private:
 	void stroke_added(ptr_Stroke stroke);
+	void redraw(QRect rect);
 	void stroke_deleted(ptr_Stroke stroke);
 
 	std::variant<NormalLayer*, TemporaryLayer*> m_layer;