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Use a more random hash to generate user colors

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Fixes an issue where most uses just had their color determined by their
username length and distributes the colors a bit more evenly.
This commit is contained in:
Nicolas Werner 2021-11-24 00:47:02 +01:00
parent aea7461cba
commit 0f2faff4e7
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GPG key ID: C8D75E610773F2D9
1 changed files with 7 additions and 7 deletions
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14
src/Utils.cpp
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@ -7,6 +7,7 @@
#include <QApplication> #include <QApplication>
#include <QBuffer> #include <QBuffer>
#include <QComboBox> #include <QComboBox>
#include <QCryptographicHash>
#include <QDesktopWidget> #include <QDesktopWidget>
#include <QGuiApplication> #include <QGuiApplication>
#include <QImageReader> #include <QImageReader>
@ -641,13 +642,9 @@ utils::linkColor()
uint32_t uint32_t
utils::hashQString(const QString &input) utils::hashQString(const QString &input)
{ {
uint32_t hash = 0; auto h = QCryptographicHash::hash(input.toUtf8(), QCryptographicHash::Sha1);
for (int i = 0; i < input.length(); i++) { return (h[0] << 24) ^ (h[1] << 16) ^ (h[2] << 8) ^ h[3];
hash = input.at(i).digitValue() + ((hash << 5) - hash);
}
return hash;
} }
QColor QColor
@ -658,7 +655,10 @@ utils::generateContrastingHexColor(const QString &input, const QColor &backgroun
// Create a color for the input // Create a color for the input
auto hash = hashQString(input); auto hash = hashQString(input);
// create a hue value based on the hash of the input. // create a hue value based on the hash of the input.
auto userHue = static_cast<int>(hash % 360); // Adapted to make Nico blue
auto userHue =
static_cast<int>(static_cast<double>(hash - static_cast<uint32_t>(0x60'00'00'00)) /
std::numeric_limits<uint32_t>::max() * 360.);
// start with moderate saturation and lightness values. // start with moderate saturation and lightness values.
auto sat = 230; auto sat = 230;
auto lightness = 125; auto lightness = 125;