Add thumbnail support for krita files

hydrus/core/HydrusConstants.py

@@ -761,7 +761,7 @@ MIMES_THAT_MAY_HAVE_AUDIO = tuple( list( MIMES_THAT_DEFINITELY_HAVE_AUDIO ) + li
 
 ARCHIVES = { APPLICATION_ZIP, APPLICATION_HYDRUS_ENCRYPTED_ZIP, APPLICATION_RAR, APPLICATION_7Z }
 
-MIMES_WITH_THUMBNAILS = set( IMAGES ).union( ANIMATIONS ).union( VIDEO ).union( { APPLICATION_FLASH, APPLICATION_CLIP, APPLICATION_PSD } )
+MIMES_WITH_THUMBNAILS = set( IMAGES ).union( ANIMATIONS ).union( VIDEO ).union( { APPLICATION_FLASH, APPLICATION_CLIP, APPLICATION_PSD, APPLICATION_KRITA } )
 
 FILES_THAT_CAN_HAVE_ICC_PROFILE = { IMAGE_JPEG, IMAGE_PNG, IMAGE_GIF, IMAGE_TIFF }
 

hydrus/core/HydrusFileHandling.py

@@ -4,6 +4,7 @@ import struct
 
 from hydrus.core import HydrusAudioHandling
 from hydrus.core import HydrusClipHandling
+from hydrus.core import HydrusKritaHandling
 from hydrus.core import HydrusConstants as HC
 from hydrus.core import HydrusData
 from hydrus.core import HydrusDocumentHandling
@@ -154,7 +155,28 @@ def GenerateThumbnailBytes( path, target_resolution, mime, duration, num_frames,
             
             HydrusTemp.CleanUpTempPath( os_file_handle, temp_path )
             
+
+    elif mime == HC.APPLICATION_KRITA:
         
+        ( os_file_handle, temp_path ) = HydrusTemp.GetTempPath()
+        
+        try:
+            
+            HydrusKritaHandling.ExtractZippedImageToPath( path, temp_path )
+            
+            thumbnail_bytes = HydrusImageHandling.GenerateThumbnailBytesFromStaticImagePath( temp_path, target_resolution, HC.IMAGE_PNG, clip_rect = clip_rect )
+            
+        except Exception as e:
+            
+            thumb_path = os.path.join( HC.STATIC_DIR, 'krita.png' )
+            
+            thumbnail_bytes = HydrusImageHandling.GenerateThumbnailBytesFromStaticImagePath( thumb_path, target_resolution, HC.IMAGE_PNG, clip_rect = clip_rect )
+            
+        finally:
+            
+            HydrusTemp.CleanUpTempPath( os_file_handle, temp_path )
+        
+
     elif mime == HC.APPLICATION_FLASH:
         
         ( os_file_handle, temp_path ) = HydrusTemp.GetTempPath()
@@ -316,6 +338,10 @@ def GetFileInfo( path, mime = None, ok_to_look_for_hydrus_updates = False ):
         
         ( ( width, height ), duration, num_frames ) = HydrusClipHandling.GetClipProperties( path )
         
+    elif mime == HC.APPLICATION_KRITA:
+        
+        ( width, height ) = HydrusKritaHandling.GetKraProperties( path )
+
     elif mime == HC.APPLICATION_FLASH:
         
         ( ( width, height ), duration, num_frames ) = HydrusFlashHandling.GetFlashProperties( path )

hydrus/core/HydrusKritaHandling.py

@@ -0,0 +1,93 @@
+
+from hydrus.core import HydrusExceptions
+from hydrus.core import HydrusTemp
+
+import zipfile
+import re 
+
+KRITA_FILE_THUMB = "preview.png"
+KRITA_FILE_MERGED = "mergedimage.png"
+
+
+def ExtractSingleFileFromZip( path_to_zip, filename_to_extract, extract_into_file_path ):
+
+    with zipfile.ZipFile( path_to_zip ) as zip_handle:
+
+        with zip_handle.open( filename_to_extract ) as reader:
+
+            with open( extract_into_file_path, "wb" ) as writer:
+
+                writer.write( reader.read() )
+
+
+def ExtractZippedImageToPath( path_to_zip, temp_path_file ):
+
+    try:
+        
+        ExtractSingleFileFromZip( path_to_zip, KRITA_FILE_MERGED, temp_path_file )
+
+        return
+        
+    except KeyError:
+
+        pass
+            
+        
+    try:
+        
+        ExtractSingleFileFromZip( path_to_zip, KRITA_FILE_THUMB, temp_path_file )            
+        
+    except KeyError:
+
+        raise HydrusExceptions.DamagedOrUnusualFileException( f'This krita file had no {KRITA_FILE_MERGED} or {KRITA_FILE_THUMB}, so no PNG thumb could be extracted!' )
+
+
+# TODO: animation and frame stuff which is also in the maindoc.xml
+def GetKraProperties( path ):
+
+    ( os_file_handle, maindoc_xml ) = HydrusTemp.GetTempPath()
+
+    DOCUMENT_INFO_FILE = "maindoc.xml"
+
+    # TODO: probably actually parse the xml instead of using regex
+    FIND_KEY_VALUE = re.compile(r"([a-z\-\_]+)\s*=\s*['\"]([^'\"]+)", re.IGNORECASE)
+
+    width = None 
+    height = None
+
+    try:
+
+        ExtractSingleFileFromZip( path, DOCUMENT_INFO_FILE, maindoc_xml ) 
+
+        with open(maindoc_xml, "r") as reader:
+
+            for line in reader:
+
+                for match in FIND_KEY_VALUE.findall( line ):
+
+                    key, value = match 
+
+                    if key == "width" and value.isdigit():
+
+                        width = int(value)
+
+                    if key == "height" and value.isdigit():
+
+                        height = int(value)
+
+                    if width is not None and height is not None:
+
+                        break
+
+    except KeyError:
+
+        raise HydrusExceptions.DamagedOrUnusualFileException( f'This krita file had no {DOCUMENT_INFO_FILE}, so no information could be extracted!' )
+
+    finally:
+
+        HydrusTemp.CleanUpTempPath( os_file_handle, maindoc_xml ) 
+
+    return width, height
+
+
+