我正在尝试使用 Python 2.7 和 Tkinker 循环播放 gif。它将在树莓派上运行,但我的实现甚至在我更强大的 Macbook pro 上也滞后。这是一个如何实现的示例:
frames= [] #holds gif images
weatherIND = 0 #frame of gif currently being displayed
#processes and initializes gif, then starts the loop
def getWeather()
global frames
frames= []
self.processImage("assets/Rain.gif")
print("frames len = " + str(len(frames)))
Photo = frames[0] #initialize
self.iconLbl.config(image=Photo)
self.iconLbl.image = Photo
self.after(0, self.update) #start the loop
#displays the next frame of the gif every 20 ms
def update(self):
global weatherInd
global frames
if weatherInd == (len(frames)):
weatherInd = 0
Photo = frames[weatherInd]
self.iconLbl.config(image=Photo)
self.iconLbl.image = Photo
weatherInd+=1
self.after(20, self.update)
#takes a gif and puts each frame in a list as a PhotoImage object
def processImage(self, path):
'''
Iterate the GIF, extracting each frame.
'''
global frames
mode = 'global'
im = Image.open(path)
i = 0
p = im.getpalette()
last_frame = im.convert('RGBA')
try:
while True:
print "saving %s (%s) frame %d, %s %s" % (path, mode, i, im.size, im.tile)
'''
If the GIF uses local colour tables, each frame will have its own palette.
If not, we need to apply the global palette to the new frame.
'''
if not im.getpalette():
im.putpalette(p)
new_frame = Image.new('RGBA', im.size)
'''
Is this file a "partial"-mode GIF where frames update a region of a different size to the entire image?
If so, we need to construct the new frame by pasting it on top of the preceding frames.
'''
if mode == 'partial':
new_frame.paste(last_frame)
new_frame.paste(im, (0,0), im.convert('RGBA'))
new_frame = new_frame.resize((100,100), Image.ANTIALIAS)
Photo = ImageTk.PhotoImage(new_frame)
frames.append(Photo)
i += 1
last_frame = new_frame
im.seek(im.tell() + 1)
except EOFError:
pass
现在的问题是,当 gif 正在播放时,每 5-10 秒它会在一个帧上挂起 1/2-1 秒。如果我试图每 20 毫秒处理或调整 gif 帧的大小,这是可以预料的,但我相信我只是用预处理图像更新标签。有没有更有效的方法来做到这一点,所以 tkinter 不会滞后?