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apt install dirmngr

In auto/config:

# Create a keyring that contains the keys we need for debootstrap
# See https://github.com/ValveSoftware/steam-runtime/issues/81
gpg "--keyring=$(pwd)/config/keyring.gpg" --no-default-keyring --keyserver keyserver.ubuntu.com --receive-keys 0x40976EAF437D05B5

In auto/build, before the build starts:

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$ i2cdetect -l
i2c-3    unknown    i915 gmbus panel                N/A
i2c-1    unknown    i915 gmbus ssc                  N/A
i2c-8    unknown    DPDDC-C                         N/A
i2c-6    unknown    i915 gmbus dpd                  N/A
i2c-4    unknown    i915 gmbus dpc                  N/A
i2c-2    unknown    i915 gmbus vga                  N/A
i2c-0    unknown    SMBus I801 adapter at e000      N/A
i2c-7    unknown    DPDDC-B                         N/A

i2c-5 unknown i915 gmbus dpb N/A

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I had a need to build a custom Ubuntu 18.04 kernel with a minor config option change.

The build script is based on these instructions from the Ubuntu wiki.

Differences from mainline

• Enables interrupt support for the PCA9535 GPIO controller
• Excludes the Nvidia DKMS modules

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'''
This module provides a function to enable video capture from screen devices such
as attached iPhones. Only macOS hosts are supported.

    enable_screen_capture_devices()

You may need QuickTime running to see the devices:

    https://stackoverflow.com/questions/48166748/coremediaio-doesnt-list-iphone-camera-unless-quicktime-is-open
'''

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static const char *gpio_alt_names_2711[54*6] =
{
    "SDA0"      , "SA5"        , "PCLK"      , "SPI3_CE0_N"    , "TXD2"            , "SDA6"        ,
    "SCL0"      , "SA4"        , "DE"        , "SPI3_MISO"     , "RXD2"            , "SCL6"        ,
    "SDA1"      , "SA3"        , "LCD_VSYNC" , "SPI3_MOSI"     , "CTS2"            , "SDA3"        ,
    "SCL1"      , "SA2"        , "LCD_HSYNC" , "SPI3_SCLK"     , "RTS2"            , "SCL3"        ,
    "GPCLK0"    , "SA1"        , "DPI_D0"    , "SPI4_CE0_N"    , "TXD3"            , "SDA3"        ,
    "GPCLK1"    , "SA0"        , "DPI_D1"    , "SPI4_MISO"     , "RXD3"            , "SCL3"        ,
    "GPCLK2"    , "SOE_N_SE"   , "DPI_D2"    , "SPI4_MOSI"     , "CTS3"            , "SDA4"        ,
    "SPI0_CE1_N", "SWE_N_SRW_N", "DPI_D3"    , "SPI4_SCLK"     , "RTS3"            , "SCL4"        ,

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Notes from OpenCV 4.4.0.

The CUDA APIs are mostly in the cv2.cuda module except a few that are in cv2 such as cv2.cuda_GpuMat and cv2.cuda_Stream.

cv2.cuda_FarnebackOpticalFlow has the same interface as cv2.FarnebackOpticalFlow.

cv2.cuda.createMorphologyFilter doesn't support 3 channel filters.

You must provide the output array to cv2.cuda.merge(_, output). The API doesn't return a GpuMat instance.

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#!/usr/bin/env python3
'''
Attempt to implement a statically type-checked state machine in Python. Doesn't work super well.
'''

import inspect

import typeguard

from typing import Callable, ForwardRef, Optional, Type, Union

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#!/usr/bin/env python3
'''
This script helps in maintaining multiple working trees for the LLVM project.
'''

import os
import subprocess


def ensure_main_tree(main):

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class MyMemoryview:
    def __init__(self, mv):
        self._mv = memoryview(mv)

    def __getitem__(self, i):
        value = self._mv.__getitem__(i)
        if isinstance(value, memoryview):
            return MyMemoryview(value)
        return value

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#!/usr/bin/env python3
'''
Compare the rumored device size of a 5.4" iPhone 12 to the beloved first-
generation iPhone SE.

Assumes that the iPhone 12 will have the same screen aspect ratio as the
iPhone 11.
'''

class iPhone: