gifio – Access GIF-format images

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class gifio.GifWriter(file: BinaryIO | str, width: int, height: int, colorspace: displayio.Colorspace, loop: bool = True, dither: bool = False)

Construct a GifWriter object

Parameters:
  • file – Either a file open in bytes mode, or the name of a file to open in bytes mode.

  • width – The width of the image. All frames must have the same width.

  • height – The height of the image. All frames must have the same height.

  • colorspace – The colorspace of the image. All frames must have the same colorspace. The supported colorspaces are RGB565, BGR565, RGB565_SWAPPED, BGR565_SWAPPED, and L8 (greyscale)

  • loop – If True, the GIF is marked for looping playback

  • dither – If True, and the image is in color, a simple ordered dither is applied.

__enter__() GifWriter

No-op used by Context Managers.

__exit__() None

Automatically deinitializes the hardware when exiting a context. See Lifetime and ContextManagers for more info.

deinit() None

Close the underlying file.

add_frame(bitmap: circuitpython_typing.ReadableBuffer, delay: float = 0.1) None

Add a frame to the GIF.

Parameters:
  • bitmap – The frame data

  • delay – The frame delay in seconds. The GIF format rounds this to the nearest 1/100 second, and the largest permitted value is 655 seconds.

class gifio.OnDiskGif(file: str)

Loads one frame of a GIF into memory at a time.

The code can be used in cooperation with displayio but this mode is relatively slow:

import board
import gifio
import displayio
import time

display = board.DISPLAY
splash = displayio.Group()
display.root_group = splash

odg = gifio.OnDiskGif('/sample.gif')

start = time.monotonic()
next_delay = odg.next_frame() # Load the first frame
end = time.monotonic()
overhead = end - start

face = displayio.TileGrid(
    odg.bitmap,
    pixel_shader=displayio.ColorConverter(
        input_colorspace=displayio.Colorspace.RGB565_SWAPPED
    ),
)
splash.append(face)
board.DISPLAY.refresh()

# Display repeatedly.
while True:
    # Sleep for the frame delay specified by the GIF,
    # minus the overhead measured to advance between frames.
    time.sleep(max(0, next_delay - overhead))
    next_delay = odg.next_frame()

The displayio Group and TileGrid layers can be bypassed and the image can be directly blitted to the full screen. This can give a speed-up of ~4x to ~6x depending on the GIF and display. This requires an LCD that uses standard codes to set the update area, and which accepts RGB565_SWAPPED pixel data directly:

# Initial set-up the same as above

# Take over display to drive directly
display.auto_refresh = False
display_bus = display.bus

# Display repeatedly & directly.
while True:
    # Sleep for the frame delay specified by the GIF,
    # minus the overhead measured to advance between frames.
    time.sleep(max(0, next_delay - overhead))
    next_delay = odg.next_frame()

    display_bus.send(42, struct.pack(">hh", 0, odg.bitmap.width - 1))
    display_bus.send(43, struct.pack(">hh", 0, odg.bitmap.height - 1))
    display_bus.send(44, odg.bitmap)

# The following optional code will free the OnDiskGif and allocated resources
# after use. This may be required before loading a new GIF in situations
# where RAM is limited and the first GIF took most of the RAM.
odg.deinit()
odg = None
gc.collect()

Create an OnDiskGif object with the given file. The GIF frames are decoded into RGB565 big-endian format. displayio expects little-endian, so the example above uses Colorspace.RGB565_SWAPPED.

Parameters:

file (file) – The name of the GIF file.

If the image is too large it will be cropped at the bottom and right when displayed.

Limitations: The image width is limited to 320 pixels at present. ValueError will be raised if the image is too wide. The height is not limited but images that are too large will cause a memory exception.

width: int

Width of the gif. (read only)

height: int

Height of the gif. (read only)

bitmap: displayio.Bitmap

The bitmap used to hold the current frame.

palette: displayio.Palette | None

The palette for the current frame if it exists.

duration: float

Returns the total duration of the GIF in seconds. (read only)

frame_count: int

Returns the number of frames in the GIF. (read only)

min_delay: float

The minimum delay found between frames. (read only)

max_delay: float

The maximum delay found between frames. (read only)

__enter__() OnDiskGif

No-op used by Context Managers.

__exit__() None

Automatically deinitializes the GIF when exiting a context. See Lifetime and ContextManagers for more info.

next_frame() float

Loads the next frame. Returns expected delay before the next frame in seconds.

deinit() None

Release resources allocated by OnDiskGif.