[bug#39316] [PATCH] gnu: Add python-pypng.

[Jakub Kądziołka]

* gnu/packages/python-xyz.scm (python-pypng): New variable.
---
 gnu/packages/python-xyz.scm | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 2af2b2011c..c5e6731642 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -68,6 +68,7 @@
 ;;; Copyright © 2019 Wiktor Żelazny <address@hidden>
 ;;; Copyright © 2019 Tanguy Le Carrour <address@hidden>
 ;;; Copyright © 2019 Mădălin Ionel Patrașcu <address@hidden>
+;;; Copyright © 2020 Jakub Kądziołka <address@hidden>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -17436,3 +17437,32 @@ Project, or not such a gitlab instance when your 
upstream doesn't use any
 dedicated platform.  The tool proposes a unified interface for any format and
 an upload option to send your work back to the platform.")
     (license license:gpl3+)))
+
+(define-public python-pypng
+  (package
+    (name "python-pypng")
+    (version "0.0.20")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (pypi-uri "pypng" version))
+        (sha256
+          (base32
+            "02qpa22ls41vwsrzw9r9qhj1nhq05p03hb5473pay6y980s86chh"))))
+    (build-system python-build-system)
+    (home-page "https://github.com/drj11/pypng";)
+    (synopsis "Pure Python PNG image encoder/decoder")
+    (description
+      ;; Description adapted from Debian
+      "The PyPNG module implements support for PNG images.  It reads and 
writes PNG files
+with all allowable bit depths (1/2/4/8/16/24/32/48/64 bits per pixel) and 
colour
+combinations: greyscale (1/2/4/8/16 bit); RGB, RGBA, LA (greyscale with alpha) 
with
+8/16 bits per channel; colour mapped images (1/2/4/8 bit).  Adam7 interlacing 
is supported
+for reading and writing.  A number of optional chunks can be specified (when 
writing) and
+understood (when reading): tRNS, bKGD, gAMA.
+
+PyPNG is not a high level toolkit for image processing (like PIL) and does not 
aim at
+being a replacement or competitor.  Its strength lies in fine-grained 
extensive support of
+PNG features.  It can also read and write Netpbm PAM files, with a focus on 
its use as an
+intermediate format for implementing custom PNG processing.")
+    (license license:expat)))
-- 
2.25.0