From de30f809efd68571da9b1b2ce2023fffae274d30 Mon Sep 17 00:00:00 2001
From: Antoine Martin <antoine@xpra.org>
Date: Tue, 4 Jun 2024 23:19:58 +0700
Subject: [PATCH] #3837 add plane range dump utility function

---
 xpra/codecs/argb/argb.pxd |  4 +++-
 xpra/codecs/argb/argb.pyx | 17 +++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/xpra/codecs/argb/argb.pxd b/xpra/codecs/argb/argb.pxd
index 7fc57d935a..20d668e4a9 100644
--- a/xpra/codecs/argb/argb.pxd
+++ b/xpra/codecs/argb/argb.pxd
@@ -1,6 +1,6 @@
 # This file is part of Xpra.
 # Copyright (C) 2008, 2009 Nathaniel Smith <njs@pobox.com>
-# Copyright (C) 2013-2021 Antoine Martin <antoine@xpra.org>
+# Copyright (C) 2013-2024 Antoine Martin <antoine@xpra.org>
 # Xpra is released under the terms of the GNU GPL v2, or, at your option, any
 # later version. See the file COPYING for details.
 
@@ -8,3 +8,5 @@ cdef argbdata_to_rgba(const unsigned int* argb, const int argb_len)  #pylint: di
 cdef argbdata_to_rgb(const unsigned int* argb, const int argb_len)
 cdef bgradata_to_rgb(const unsigned int* bgra, const int bgra_len)
 cdef bgradata_to_rgba(const unsigned int* bgra, const int bgra_len)
+
+cdef show_plane_range(name, plane, int width, int stride, int height)
diff --git a/xpra/codecs/argb/argb.pyx b/xpra/codecs/argb/argb.pyx
index d14d472751..1663349ce3 100644
--- a/xpra/codecs/argb/argb.pyx
+++ b/xpra/codecs/argb/argb.pyx
@@ -776,3 +776,20 @@ cdef bitdata_to_rectangles(const unsigned char* bitdata, const int bitdata_len,
             if start<end:
                 rectangles.append((start, y, end-start, 1))
     return rectangles
+
+
+cdef show_plane_range(name, plane, int width, int stride, int height):
+    cdef unsigned char minv = 255
+    cdef unsigned char maxv = 0
+    cdef unsigned char value
+    cdef const unsigned char *plane_buf
+    with buffer_context(plane) as buf:
+        plane_buf = <unsigned char *> (<uintptr_t> int(buf))
+        for y in range(height):
+            for x in range(width):
+                value = plane_buf[y*stride + x]
+                if value < minv:
+                    minv = value
+                if value > maxv:
+                    maxv = value
+    log.info("%s plane: min=%s, max=%s", name, minv, maxv)