From 2fc2c5b562c1d8ae94ff11cdf0587cc5ff288d72 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 13 Jun 2022 10:41:24 +0200
Subject: Fix support of transparent windows by wayland platform.

---
 src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx b/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx
index f0b4fd6f7..a299480ed 100644
--- a/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx
+++ b/src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx
@@ -71,6 +71,7 @@ struct fl_wld_buffer *Fl_Wayland_Graphics_Driver::create_shm_buffer(int width, i
   buffer->data_size = size;
   buffer->width = width;
   buffer->draw_buffer = new uchar[buffer->data_size];
+  memset(buffer->draw_buffer, 0, buffer->data_size); // necessary for transparent windows
   buffer->draw_buffer_needs_commit = false;
 //fprintf(stderr, "create_shm_buffer: %dx%d = %d\n", width, height, size);
   cairo_init(buffer, width, height, stride, Fl_Cairo_Graphics_Driver::cairo_format);
-- 
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