Python QImage.isNull方法代码示例

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
    def render_cover(self, book_id):
        if self.ignore_render_requests.is_set():
            return
        tcdata, timestamp = self.thumbnail_cache[book_id]
        use_cache = False
        if timestamp is None:
            # Not in cache
            has_cover, cdata, timestamp = self.model().db.new_api.cover_or_cache(book_id, 0)
        else:
            has_cover, cdata, timestamp = self.model().db.new_api.cover_or_cache(book_id, timestamp)
            if has_cover and cdata is None:
                # The cached cover is fresh
                cdata = tcdata
                use_cache = True

        if has_cover:
            p = QImage()
            p.loadFromData(cdata, CACHE_FORMAT if cdata is tcdata else "JPEG")
            if p.isNull() and cdata is tcdata:
                # Invalid image in cache
                self.thumbnail_cache.invalidate((book_id,))
                self.update_item.emit(book_id)
                return
            cdata = None if p.isNull() else p
            if not use_cache:  # cache is stale
                if cdata is not None:
                    width, height = p.width(), p.height()
                    scaled, nwidth, nheight = fit_image(
                        width, height, self.delegate.cover_size.width(), self.delegate.cover_size.height()
                    )
                    if scaled:
                        if self.ignore_render_requests.is_set():
                            return
                        p = p.scaled(nwidth, nheight, Qt.IgnoreAspectRatio, Qt.SmoothTransformation)
                    cdata = p
                # update cache
                if cdata is None:
                    self.thumbnail_cache.invalidate((book_id,))
                else:
                    try:
                        self.thumbnail_cache.insert(book_id, timestamp, image_to_data(cdata))
                    except EncodeError as err:
                        self.thumbnail_cache.invalidate((book_id,))
                        prints(err)
                    except Exception:
                        import traceback

                        traceback.print_exc()
        elif tcdata is not None:
            # Cover was removed, but it exists in cache, remove from cache
            self.thumbnail_cache.invalidate((book_id,))
        self.delegate.cover_cache.set(book_id, cdata)
        self.update_item.emit(book_id)

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
 def paste(self):
     clipboard = QApplication.clipboard()
     md = clipboard.mimeData()
     if md.hasImage():
         img = QImage(md.imageData())
         if not img.isNull():
             self.undo_stack.push(Replace(img, _('Paste image'), self))
     else:
         error_dialog(self, _('No image'), _(
             'No image available in the clipboard'), show=True)

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
 def __init__(self, dirpath):
     pictureflow.FlowImages.__init__(self)
     self.images = []
     self.captions = []
     self.subtitles = []
     for f in os.listdir(dirpath):
         f = os.path.join(dirpath, f)
         img = QImage(f)
         if not img.isNull():
             self.images.append(img)
             self.captions.append(os.path.basename(f))
             self.subtitles.append('%d bytes'%os.stat(f).st_size)

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
 def render_cover(self, book_id):
     cdata = self.model().db.new_api.cover(book_id)
     if self.ignore_render_requests.is_set():
         return
     if cdata is not None:
         p = QImage()
         p.loadFromData(cdata)
         cdata = None
         if not p.isNull():
             width, height = p.width(), p.height()
             scaled, nwidth, nheight = fit_image(width, height, self.delegate.cover_size.width(), self.delegate.cover_size.height())
             if scaled:
                 if self.ignore_render_requests.is_set():
                     return
                 p = p.scaled(nwidth, nheight, Qt.IgnoreAspectRatio, Qt.SmoothTransformation)
             cdata = p
     self.delegate.cover_cache.set(book_id, cdata)
     self.update_item.emit(book_id)

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
 def __call__(self, container):
     from PyQt4.Qt import QImage
     from calibre.gui2 import pixmap_to_data
     ext = container.mime_map[self.name].split('/')[-1].upper()
     if ext == 'JPG':
         ext = 'JPEG'
     if ext not in ('PNG', 'JPEG', 'GIF'):
         return False
     with container.open(self.name, 'r+b') as f:
         raw = f.read()
         i = QImage()
         i.loadFromData(raw)
         if i.isNull():
             return False
         raw = pixmap_to_data(i, format=ext, quality=95)
         f.seek(0)
         f.truncate()
         f.write(raw)
     return True

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
    def dropEvent(self, event):
        event.setDropAction(Qt.CopyAction)
        md = event.mimeData()

        x, y = dnd_get_image(md)
        if x is not None:
            # We have an image, set cover
            event.accept()
            if y is None:
                # Local image
                self.undo_stack.push(Replace(x.toImage(), _('Drop image'), self))
            else:
                d = DownloadDialog(x, y, self.gui)
                d.start_download()
                if d.err is None:
                    with open(d.fpath, 'rb') as f:
                        img = QImage()
                        img.loadFromData(f.read())
                    if not img.isNull():
                        self.undo_stack.push(Replace(img, _('Drop image'), self))

        event.accept()

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
class VoivoiShow(Slide):
    '''
    VoiVoi Slideshow class for displaying images from voivoi database
    '''
    imgList = list()
    eventID = 0
    mostRecent = datetime.fromtimestamp(0)
    host = "127.0.0.1"
    user = "anonymous"
    passwd = "secret"
    db = "voivoi"
    
    def __init__(self, parent = None):
        '''
        Constructor
        '''
        super(VoivoiShow, self).__init__(parent)
        #self.setStyleSheet("background: #000;")
        
        self.splashscreen = QImage("res/splashscreen.jpg")
        #print(self.splashscreen.isNull())
        if not self.splashscreen.isNull():
            self.imgList.append(self.splashscreen)
                                      
        self.imageLabel = QLabel()
        self.imageLabel.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)
        self.imageLabel.setParent(self)

        self.httpPool = urllib3.PoolManager()
        
        self.slideIterator = 0
        self.timer.timeout.connect(self.nextImage)
        self.updateTimer = QTimer()
        self.updateTimer.timeout.connect(self.updateImages)
        self.mostRecent = datetime.fromtimestamp(0)
        
        self.layout = QHBoxLayout()
        self.layout.setMargin(0)
        self.layout.addWidget(self.imageLabel)
        self.layout.setAlignment(self.imageLabel, Qt.AlignHCenter)
        self.setLayout(self.layout)
        self.voivoifont = QFont("Helvetica", 48)
        self.voivoifont.setBold(True)
        
    def setup(self, host, user, passwd, event_id, database="voivoi", slideInterval=10, updateInterval=60):
        ''' setup the slide for it's display routine '''
        
        self.host = host
        print(self.host)
        self.user = user
        self.passwd = passwd
        self.interval = slideInterval
        self.updateInterval = updateInterval
        self.db=database
        self.eventID = event_id
        self.updateImages()
        
    def updateImages(self, buffer_limit=20):
        try:
            db_connection = pymysql.connect(self.host, self.user, self.passwd, self.db)
        except: 
            print("Database connection not available")
            return
        
        sqlquery = "SELECT `categoryOrder`, `userID`, `dayID`, `comment`, `timestamp`, `eventID` FROM `pictures` WHERE `eventID`>=" + str(self.eventID) + " AND `timestamp`>'" + str(self.mostRecent) + "' ORDER BY `timestamp` ASC"
        #print(sqlquery)
        try:
            with db_connection.cursor() as cursor:
                cursor.execute(sqlquery)
                
                result = cursor.fetchall()
                
                for entry in result:
                    print(entry[4])
                    #print(self.mostRecent)
                    if entry[4] > self.mostRecent:
                        if entry[0] == 0:
                            print("BREAKING")
                            continue
                        self.mostRecent = entry[4]
                        image_url = "http://voivoi.eventfive.de/events/" + str(entry[5]) + "/uploads/" + str(entry[0]) + "_" + str(entry[1]) + "_" + str(entry[2]) + ".jpg"
                        req = self.httpPool.request('GET',image_url)
                        if req.status == 200:
                            data = req.data
                            print("Newer file downloaded")
                                
                            might_be_image = QImage()
                            if might_be_image.loadFromData(data) :
                                #print("URL is valid")
                                self.drawOverlay(might_be_image, entry)
                            
                                if len(self.imgList) > buffer_limit-1: #TODO: change behaviour to iteration over fixed list, to prevent jumps
                                    self.imgList.pop(1)
                                self.imgList.append(might_be_image)
                               
        finally: 
            print("Update done, closing connection")
            db_connection.close()
    
    def drawOverlay(self, image, entry):
#.........这里部分代码省略.........

# 需要导入模块: from PyQt4.Qt import QImage [as 别名]
# 或者: from PyQt4.Qt.QImage import isNull [as 别名]
    def rescale(self, qt=True):
        from calibre.utils.magick.draw import Image

        is_image_collection = getattr(self.opts, 'is_image_collection', False)

        if is_image_collection:
            page_width, page_height = self.opts.dest.comic_screen_size
        else:
            page_width, page_height = self.opts.dest.width, self.opts.dest.height
            page_width -= (self.opts.margin_left + self.opts.margin_right) * self.opts.dest.dpi/72.
            page_height -= (self.opts.margin_top + self.opts.margin_bottom) * self.opts.dest.dpi/72.

        for item in self.oeb.manifest:
            if item.media_type.startswith('image'):
                ext = item.media_type.split('/')[-1].upper()
                if ext == 'JPG':
                    ext = 'JPEG'
                if ext not in ('PNG', 'JPEG', 'GIF'):
                    ext = 'JPEG'

                raw = item.data
                if hasattr(raw, 'xpath') or not raw:
                    # Probably an svg image
                    continue
                try:
                    img = Image()
                    img.load(raw)
                except:
                    continue
                width, height = img.size

                try:
                    if self.check_colorspaces and img.colorspace == 'CMYKColorspace':
                        # We cannot do an imagemagick conversion of CMYK to RGB as
                        # ImageMagick inverts colors if you just set the colorspace
                        # to rgb. See for example: https://bugs.launchpad.net/bugs/1246710
                        from PyQt4.Qt import QImage
                        from calibre.gui2 import pixmap_to_data
                        qimg = QImage()
                        qimg.loadFromData(raw)
                        if not qimg.isNull():
                            raw = item.data = pixmap_to_data(qimg, format=ext, quality=95)
                            img = Image()
                            img.load(raw)
                            self.log.warn(
                                'The image %s is in the CMYK colorspace, converting it '
                                'to RGB as Adobe Digital Editions cannot display CMYK' % item.href)
                        else:
                            self.log.warn(
                                'The image %s is in the CMYK colorspace, you should convert'
                                ' it to sRGB as Adobe Digital Editions cannot render CMYK' % item.href)
                except Exception:
                    pass

                scaled, new_width, new_height = fit_image(width, height,
                        page_width, page_height)
                if scaled:
                    new_width = max(1, new_width)
                    new_height = max(1, new_height)
                    self.log('Rescaling image from %dx%d to %dx%d'%(
                        width, height, new_width, new_height), item.href)
                    try:
                        img.size = (new_width, new_height)
                        data = img.export(ext.lower())
                    except KeyboardInterrupt:
                        raise
                    except:
                        self.log.exception('Failed to rescale image')
                    else:
                        item.data = data
                        item.unload_data_from_memory()