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#!/usr/bin/env python3

# Python Stream Deck Library

# Released under the MIT license

#

# dean [at] fourwalledcubicle [dot] com

# www.fourwalledcubicle.com

#

# Example script showing how to tile a larger image across multiple buttons, by

# first generating an image suitable for the entire deck, then cropping out and

# applying key-sized tiles to individual keys of a StreamDeck.

import os

import threading

from PIL import Image, ImageOps

from StreamDeck.DeviceManager import DeviceManager

from StreamDeck.ImageHelpers import PILHelper

# Folder location of image assets used by this example.

ASSETS_PATH = os.path.join(os.path.dirname(__file__), "Assets")

# Generates an image that is correctly sized to fit across all keys of a given

# StreamDeck.

def create_full_deck_sized_image(deck, key_spacing, image_filename):

key_rows, key_cols = deck.key_layout()

key_width, key_height = deck.key_image_format()['size']

spacing_x, spacing_y = key_spacing

# Compute total size of the full StreamDeck image, based on the number of

# buttons along each axis. This doesn't take into account the spaces between

# the buttons that are hidden by the bezel.

key_width *= key_cols

key_height *= key_rows

# Compute the total number of extra non-visible pixels that are obscured by

# the bezel of the StreamDeck.

spacing_x *= key_cols - 1

spacing_y *= key_rows - 1

# Compute final full deck image size, based on the number of buttons and

# obscured pixels.

full_deck_image_size = (key_width + spacing_x, key_height + spacing_y)

# Resize the image to suit the StreamDeck's full image size. We use the

# helper function in Pillow's ImageOps module so that the image's aspect

# ratio is preserved.

image = Image.open(os.path.join(ASSETS_PATH, image_filename)).convert("RGBA")

image = ImageOps.fit(image, full_deck_image_size, Image.LANCZOS)

return image

# Crops out a key-sized image from a larger deck-sized image, at the location

# occupied by the given key index.

def crop_key_image_from_deck_sized_image(deck, image, key_spacing, key):

key_rows, key_cols = deck.key_layout()

key_width, key_height = deck.key_image_format()['size']

spacing_x, spacing_y = key_spacing

# Determine which row and column the requested key is located on.

row = key // key_cols

col = key % key_cols

# Compute the starting X and Y offsets into the full size image that the

# requested key should display.

start_x = col * (key_width + spacing_x)

start_y = row * (key_height + spacing_y)

# Compute the region of the larger deck image that is occupied by the given

# key, and crop out that segment of the full image.

region = (start_x, start_y, start_x + key_width, start_y + key_height)

segment = image.crop(region)

# Create a new key-sized image, and paste in the cropped section of the

# larger image.

key_image = PILHelper.create_image(deck)

key_image.paste(segment)

return PILHelper.to_native_format(deck, key_image)

# Closes the StreamDeck device on key state change.

def key_change_callback(deck, key, state):

# Use a scoped-with on the deck to ensure we're the only thread using it

# right now.

with deck:

# Reset deck, clearing all button images.

deck.reset()

# Close deck handle, terminating internal worker threads.

deck.close()

if __name__ == "__main__":

streamdecks = DeviceManager().enumerate()

print("Found {} Stream Deck(s).\n".format(len(streamdecks)))

for index, deck in enumerate(streamdecks):

deck.open()

deck.reset()

print("Opened '{}' device (serial number: '{}')".format(deck.deck_type(), deck.get_serial_number()))

# Set initial screen brightness to 30%.

deck.set_brightness(30)

# Approximate number of (non-visible) pixels between each key, so we can

# take those into account when cutting up the image to show on the keys.

key_spacing = (36, 36)

# Load and resize a source image so that it will fill the given

# StreamDeck.

image = create_full_deck_sized_image(deck, key_spacing, "Harold.jpg")

print("Created full deck image size of {}x{} pixels.".format(image.width, image.height))

# Extract out the section of the image that is occupied by each key.

key_images = dict()

for k in range(deck.key_count()):

key_images[k] = crop_key_image_from_deck_sized_image(deck, image, key_spacing, k)

# Use a scoped-with on the deck to ensure we're the only thread

# using it right now.

with deck:

# Draw the individual key images to each of the keys.

for k in range(deck.key_count()):

key_image = key_images[k]

# Show the section of the main image onto the key.

deck.set_key_image(k, key_image)

# Register callback function for when a key state changes.

deck.set_key_callback(key_change_callback)

# Wait until all application threads have terminated (for this example,

# this is when all deck handles are closed).

for t in threading.enumerate():

if t is threading.currentThread():

continue

if t.is_alive():

t.join()