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-rwxr-xr-xcontrib/devtools/optimize-pngs.py73
1 files changed, 73 insertions, 0 deletions
diff --git a/contrib/devtools/optimize-pngs.py b/contrib/devtools/optimize-pngs.py
new file mode 100755
index 0000000000..38aaa00f31
--- /dev/null
+++ b/contrib/devtools/optimize-pngs.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import subprocess
+import hashlib
+from PIL import Image
+
+def file_hash(filename):
+ '''Return hash of raw file contents'''
+ with open(filename, 'rb') as f:
+ return hashlib.sha256(f.read()).hexdigest()
+
+def content_hash(filename):
+ '''Return hash of RGBA contents of image'''
+ i = Image.open(filename)
+ i = i.convert('RGBA')
+ data = i.tostring()
+ return hashlib.sha256(data).hexdigest()
+
+#optimize png, remove various color profiles, remove ancillary chunks (alla) and text chunks (text)
+#pngcrush -brute -ow -rem gAMA -rem cHRM -rem iCCP -rem sRGB -rem alla -rem text
+
+pngcrush = 'pngcrush'
+git = 'git'
+folders = ["src/qt/res/movies", "src/qt/res/icons", "src/qt/res/images"]
+basePath = subprocess.check_output([git, 'rev-parse', '--show-toplevel']).rstrip('\n')
+totalSaveBytes = 0
+
+outputArray = []
+for folder in folders:
+ absFolder=os.path.join(basePath, folder)
+ for file in os.listdir(absFolder):
+ extension = os.path.splitext(file)[1]
+ if extension.lower() == '.png':
+ print("optimizing "+file+"..."),
+ file_path = os.path.join(absFolder, file)
+ fileMetaMap = {'file' : file, 'osize': os.path.getsize(file_path), 'sha256Old' : file_hash(file_path)};
+ fileMetaMap['contentHashPre'] = content_hash(file_path)
+
+ pngCrushOutput = ""
+ try:
+ pngCrushOutput = subprocess.check_output(
+ [pngcrush, "-brute", "-ow", "-rem", "gAMA", "-rem", "cHRM", "-rem", "iCCP", "-rem", "sRGB", "-rem", "alla", "-rem", "text", file_path],
+ stderr=subprocess.STDOUT).rstrip('\n')
+ except:
+ print "pngcrush is not installed, aborting..."
+ sys.exit(0)
+
+ #verify
+ if "Not a PNG file" in subprocess.check_output([pngcrush, "-n", "-v", file_path], stderr=subprocess.STDOUT):
+ print "PNG file "+file+" is corrupted after crushing, check out pngcursh version"
+ sys.exit(1)
+
+ fileMetaMap['sha256New'] = file_hash(file_path)
+ fileMetaMap['contentHashPost'] = content_hash(file_path)
+
+ if fileMetaMap['contentHashPre'] != fileMetaMap['contentHashPost']:
+ print "Image contents of PNG file "+file+" before and after crushing don't match"
+ sys.exit(1)
+
+ fileMetaMap['psize'] = os.path.getsize(file_path)
+ outputArray.append(fileMetaMap)
+ print("done\n"),
+
+print "summary:\n+++++++++++++++++"
+for fileDict in outputArray:
+ oldHash = fileDict['sha256Old']
+ newHash = fileDict['sha256New']
+ totalSaveBytes += fileDict['osize'] - fileDict['psize']
+ print fileDict['file']+"\n size diff from: "+str(fileDict['osize'])+" to: "+str(fileDict['psize'])+"\n old sha256: "+oldHash+"\n new sha256: "+newHash+"\n"
+
+print "completed. Total reduction: "+str(totalSaveBytes)+" bytes"