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How does Google's Page Speed lossless image compression work?
...lly interested in the technical details, check out the source code:
png_optimizer.cc
jpeg_optimizer.cc
webp_optimizer.cc
For PNG files, they use OptiPNG with some trial-and-error approach
// we use these four combinations because different images seem to benefit from
// different parameters...
What is the difference between Cygwin and MinGW?
...-64 (pretty much what you always want, these days), install the mingw64-x86_64-gcc-core Cygwin package. MinGW-64 will then be available as the awkwardly named x86_64-w64-mingw32-gcc command. Please God(s), somebody unify the names of these bloody things already.
– Cecil Curry
...
How to use SCNetworkReachability in Swift
...ion
func connectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
guard let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
SCNetworkReachabilityCr...
Which is best way to define constants in android, either static class, interface or xml resource?
...ER = "http://192.168.100.2/bs.dev/nrum";
public static final String API_END = SERVER + "/dataProvider";
public static final String NEWS_API = API_END + "/newsApi";
public static final String BANNER_API = API_END + "/bannerApi/lists";
public static final String NOTICE_API = API_END + ...
typeof !== “undefined” vs. != null
...gument, or as a global variable), I think the best way to do it is:
if (my_variable === undefined)
jQuery does it, so it's good enough for me :-)
Otherwise, you'll have to use typeof to avoid a ReferenceError.
If you expect undefined to be redefined, you could wrap your code like this:
(functi...
Differences between Agda and Idris
...gt; a -> b -> Type where
refl : x = x
while in Agda, it is
data _≡_ {l} {A : Set l} (x : A) : A → Set a where
refl : x ≡ x
The l in the Agda defintion can be ignored, as it has to do with the universe polymorphism that Edwin mentions in his answer.
The important difference is...
Array extension to remove object by value
...
extension Array where Element:Equatable {
public mutating func remove(_ item:Element ) {
var index = 0
while index < self.count {
if self[index] == item {
self.remove(at: index)
} else {
index += 1
}
...
Google Authenticator implementation in Python
...m/tadeck/onetimepass).
import hmac, base64, struct, hashlib, time
def get_hotp_token(secret, intervals_no):
key = base64.b32decode(secret, True)
msg = struct.pack(">Q", intervals_no)
h = hmac.new(key, msg, hashlib.sha1).digest()
o = ord(h[19]) & 15
h = (struct.unpack("&g...
Auto Resize Image in CSS FlexBox Layout and keeping Aspect Ratio?
...values for align-items you could use to override: w3schools.com/cssref/css3_pr_align-items.asp
– Kyle Vassella
Oct 31 '17 at 16:50
...
How to check if a file is a valid image file?
...rce code seems to verify... nothing! pillow.readthedocs.io/en/latest/_modules/PIL/…
– Massimo
Dec 12 '19 at 21:06
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