f5286b1799
* add Dash-specific paths to `folders` in optimize-pngs.py * `mogrify src/qt/res/*/*/*.png` should fix "libpng error: IDAT: chunk data is too large" * `python contrib/devtools/optimize-pngs.py` "Total reduction: 500275 bytes"
76 lines
3.4 KiB
Python
Executable File
76 lines
3.4 KiB
Python
Executable File
#!/usr/bin/env python
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'''
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Run this script every time you change one of the png files. Using pngcrush, it will optimize the png files, remove various color profiles, remove ancillary chunks (alla) and text chunks (text).
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#pngcrush -brute -ow -rem gAMA -rem cHRM -rem iCCP -rem sRGB -rem alla -rem text
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'''
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import os
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import sys
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import subprocess
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import hashlib
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from PIL import Image
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def file_hash(filename):
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'''Return hash of raw file contents'''
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with open(filename, 'rb') as f:
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return hashlib.sha256(f.read()).hexdigest()
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def content_hash(filename):
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'''Return hash of RGBA contents of image'''
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i = Image.open(filename)
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i = i.convert('RGBA')
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data = i.tobytes()
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return hashlib.sha256(data).hexdigest()
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pngcrush = 'pngcrush'
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git = 'git'
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folders = ["src/qt/res/movies", "src/qt/res/icons", "src/qt/res/icons/crownium", "src/qt/res/icons/drkblue", "src/qt/res/icons/light", "src/qt/res/icons/trad", "src/qt/res/images", "src/qt/res/images/crownium", "src/qt/res/images/drkblue", "src/qt/res/images/light", "src/qt/res/images/trad", "share/pixmaps"]
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basePath = subprocess.check_output([git, 'rev-parse', '--show-toplevel']).rstrip('\n')
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totalSaveBytes = 0
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noHashChange = True
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outputArray = []
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for folder in folders:
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absFolder=os.path.join(basePath, folder)
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for file in os.listdir(absFolder):
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extension = os.path.splitext(file)[1]
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if extension.lower() == '.png':
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print("optimizing "+file+"..."),
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file_path = os.path.join(absFolder, file)
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fileMetaMap = {'file' : file, 'osize': os.path.getsize(file_path), 'sha256Old' : file_hash(file_path)};
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fileMetaMap['contentHashPre'] = content_hash(file_path)
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pngCrushOutput = ""
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try:
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pngCrushOutput = subprocess.check_output(
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[pngcrush, "-brute", "-ow", "-rem", "gAMA", "-rem", "cHRM", "-rem", "iCCP", "-rem", "sRGB", "-rem", "alla", "-rem", "text", file_path],
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stderr=subprocess.STDOUT).rstrip('\n')
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except:
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print "pngcrush is not installed, aborting..."
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sys.exit(0)
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#verify
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if "Not a PNG file" in subprocess.check_output([pngcrush, "-n", "-v", file_path], stderr=subprocess.STDOUT):
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print "PNG file "+file+" is corrupted after crushing, check out pngcursh version"
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sys.exit(1)
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fileMetaMap['sha256New'] = file_hash(file_path)
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fileMetaMap['contentHashPost'] = content_hash(file_path)
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if fileMetaMap['contentHashPre'] != fileMetaMap['contentHashPost']:
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print "Image contents of PNG file "+file+" before and after crushing don't match"
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sys.exit(1)
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fileMetaMap['psize'] = os.path.getsize(file_path)
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outputArray.append(fileMetaMap)
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print("done\n"),
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print "summary:\n+++++++++++++++++"
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for fileDict in outputArray:
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oldHash = fileDict['sha256Old']
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newHash = fileDict['sha256New']
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totalSaveBytes += fileDict['osize'] - fileDict['psize']
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noHashChange = noHashChange and (oldHash == newHash)
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print fileDict['file']+"\n size diff from: "+str(fileDict['osize'])+" to: "+str(fileDict['psize'])+"\n old sha256: "+oldHash+"\n new sha256: "+newHash+"\n"
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print "completed. Checksum stable: "+str(noHashChange)+". Total reduction: "+str(totalSaveBytes)+" bytes"
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