зеркало из https://github.com/nextcloud/3rdparty.git
Add kornrunner/blurhash
Signed-off-by: Louis Chemineau <louis@chmn.me>
This commit is contained in:
Louis Chemineau
Родитель
5b8a5fc015
Коммит
26ff57067f
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|
@ -145,3 +145,7 @@ symfony/process/Tests
|
|||
thecodingmachine/safe/rector-migrate-0.7.php
|
||||
|
||||
wapmorgan/mp3info/_config.yml
|
||||
|
||||
kornrunner/blurhash/test
|
||||
kornrunner/blurhash/.coveralls.yml
|
||||
kornrunner/blurhash/infection.json.dist
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@
|
|||
"guzzlehttp/guzzle": "^7.5.0",
|
||||
"icewind/searchdav": "^3.1.0",
|
||||
"icewind/streams": "^0.7.7",
|
||||
"kornrunner/blurhash": "^1.2",
|
||||
"laravel/serializable-closure": "^1.2.2",
|
||||
"mexitek/phpcolors": "^1.0",
|
||||
"microsoft/azure-storage-blob": "^1.5.4",
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
"Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
|
||||
"This file is @generated automatically"
|
||||
],
|
||||
"content-hash": "c3013c5c52fded238303c4254923bb03",
|
||||
"content-hash": "240cb2ea01f958680bf88737a3d64a45",
|
||||
"packages": [
|
||||
{
|
||||
"name": "aws/aws-crt-php",
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||||
|
|
@ -1782,6 +1782,54 @@
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|||
},
|
||||
"time": "2023-09-26T02:20:38+00:00"
|
||||
},
|
||||
{
|
||||
"name": "kornrunner/blurhash",
|
||||
"version": "v1.2.2",
|
||||
"source": {
|
||||
"type": "git",
|
||||
"url": "https://github.com/kornrunner/php-blurhash.git",
|
||||
"reference": "bc8a4596cb0a49874f0158696a382ab3933fefe4"
|
||||
},
|
||||
"dist": {
|
||||
"type": "zip",
|
||||
"url": "https://api.github.com/repos/kornrunner/php-blurhash/zipball/bc8a4596cb0a49874f0158696a382ab3933fefe4",
|
||||
"reference": "bc8a4596cb0a49874f0158696a382ab3933fefe4",
|
||||
"shasum": ""
|
||||
},
|
||||
"require": {
|
||||
"php": "^7.3|^8.0"
|
||||
},
|
||||
"require-dev": {
|
||||
"ext-gd": "*",
|
||||
"ocramius/package-versions": "^1.4|^2.0",
|
||||
"phpstan/phpstan": "^0.12",
|
||||
"phpunit/phpunit": "^9",
|
||||
"vimeo/psalm": "^4.3"
|
||||
},
|
||||
"type": "library",
|
||||
"autoload": {
|
||||
"psr-4": {
|
||||
"kornrunner\\Blurhash\\": "src"
|
||||
}
|
||||
},
|
||||
"notification-url": "https://packagist.org/downloads/",
|
||||
"license": [
|
||||
"MIT"
|
||||
],
|
||||
"authors": [
|
||||
{
|
||||
"name": "Boris Momčilović",
|
||||
"email": "boris.momcilovic@gmail.com"
|
||||
}
|
||||
],
|
||||
"description": "Pure PHP implementation of Blurhash",
|
||||
"homepage": "https://github.com/kornrunner/php-blurhash",
|
||||
"support": {
|
||||
"issues": "https://github.com/kornrunner/php-blurhash/issues",
|
||||
"source": "https://github.com/kornrunner/php-blurhash.git"
|
||||
},
|
||||
"time": "2022-07-13T19:38:39+00:00"
|
||||
},
|
||||
{
|
||||
"name": "laravel/serializable-closure",
|
||||
"version": "v1.2.2",
|
||||
|
|
|
|||
|
|
@ -3440,6 +3440,11 @@ return array(
|
|||
'cweagans\\Composer\\PatchEvent' => $vendorDir . '/cweagans/composer-patches/src/PatchEvent.php',
|
||||
'cweagans\\Composer\\PatchEvents' => $vendorDir . '/cweagans/composer-patches/src/PatchEvents.php',
|
||||
'cweagans\\Composer\\Patches' => $vendorDir . '/cweagans/composer-patches/src/Patches.php',
|
||||
'kornrunner\\Blurhash\\AC' => $vendorDir . '/kornrunner/blurhash/src/AC.php',
|
||||
'kornrunner\\Blurhash\\Base83' => $vendorDir . '/kornrunner/blurhash/src/Base83.php',
|
||||
'kornrunner\\Blurhash\\Blurhash' => $vendorDir . '/kornrunner/blurhash/src/Blurhash.php',
|
||||
'kornrunner\\Blurhash\\Color' => $vendorDir . '/kornrunner/blurhash/src/Color.php',
|
||||
'kornrunner\\Blurhash\\DC' => $vendorDir . '/kornrunner/blurhash/src/DC.php',
|
||||
'libphonenumber\\CountryCodeSource' => $vendorDir . '/giggsey/libphonenumber-for-php-lite/src/CountryCodeSource.php',
|
||||
'libphonenumber\\CountryCodeToRegionCodeMap' => $vendorDir . '/giggsey/libphonenumber-for-php-lite/src/CountryCodeToRegionCodeMap.php',
|
||||
'libphonenumber\\CountryCodeToRegionCodeMapForTesting' => $vendorDir . '/giggsey/libphonenumber-for-php-lite/src/CountryCodeToRegionCodeMapForTesting.php',
|
||||
|
|
|
|||
|
|
@ -10,6 +10,7 @@ return array(
|
|||
'phpseclib\\' => array($vendorDir . '/phpseclib/phpseclib/phpseclib'),
|
||||
'ownCloud\\TarStreamer\\' => array($vendorDir . '/deepdiver1975/tarstreamer/src'),
|
||||
'libphonenumber\\' => array($vendorDir . '/giggsey/libphonenumber-for-php-lite/src'),
|
||||
'kornrunner\\Blurhash\\' => array($vendorDir . '/kornrunner/blurhash/src'),
|
||||
'cweagans\\Composer\\' => array($vendorDir . '/cweagans/composer-patches/src'),
|
||||
'bantu\\IniGetWrapper\\' => array($vendorDir . '/bantu/ini-get-wrapper/src'),
|
||||
'ZipStreamer\\' => array($vendorDir . '/deepdiver/zipstreamer/src'),
|
||||
|
|
|
|||
|
|
@ -141,6 +141,10 @@ class ComposerStaticInit2f23f73bc0cc116b4b1eee1521aa8652
|
|||
array (
|
||||
'libphonenumber\\' => 15,
|
||||
),
|
||||
'k' =>
|
||||
array (
|
||||
'kornrunner\\Blurhash\\' => 20,
|
||||
),
|
||||
'c' =>
|
||||
array (
|
||||
'cweagans\\Composer\\' => 18,
|
||||
|
|
@ -301,6 +305,10 @@ class ComposerStaticInit2f23f73bc0cc116b4b1eee1521aa8652
|
|||
array (
|
||||
0 => __DIR__ . '/..' . '/giggsey/libphonenumber-for-php-lite/src',
|
||||
),
|
||||
'kornrunner\\Blurhash\\' =>
|
||||
array (
|
||||
0 => __DIR__ . '/..' . '/kornrunner/blurhash/src',
|
||||
),
|
||||
'cweagans\\Composer\\' =>
|
||||
array (
|
||||
0 => __DIR__ . '/..' . '/cweagans/composer-patches/src',
|
||||
|
|
@ -4089,6 +4097,11 @@ class ComposerStaticInit2f23f73bc0cc116b4b1eee1521aa8652
|
|||
'cweagans\\Composer\\PatchEvent' => __DIR__ . '/..' . '/cweagans/composer-patches/src/PatchEvent.php',
|
||||
'cweagans\\Composer\\PatchEvents' => __DIR__ . '/..' . '/cweagans/composer-patches/src/PatchEvents.php',
|
||||
'cweagans\\Composer\\Patches' => __DIR__ . '/..' . '/cweagans/composer-patches/src/Patches.php',
|
||||
'kornrunner\\Blurhash\\AC' => __DIR__ . '/..' . '/kornrunner/blurhash/src/AC.php',
|
||||
'kornrunner\\Blurhash\\Base83' => __DIR__ . '/..' . '/kornrunner/blurhash/src/Base83.php',
|
||||
'kornrunner\\Blurhash\\Blurhash' => __DIR__ . '/..' . '/kornrunner/blurhash/src/Blurhash.php',
|
||||
'kornrunner\\Blurhash\\Color' => __DIR__ . '/..' . '/kornrunner/blurhash/src/Color.php',
|
||||
'kornrunner\\Blurhash\\DC' => __DIR__ . '/..' . '/kornrunner/blurhash/src/DC.php',
|
||||
'libphonenumber\\CountryCodeSource' => __DIR__ . '/..' . '/giggsey/libphonenumber-for-php-lite/src/CountryCodeSource.php',
|
||||
'libphonenumber\\CountryCodeToRegionCodeMap' => __DIR__ . '/..' . '/giggsey/libphonenumber-for-php-lite/src/CountryCodeToRegionCodeMap.php',
|
||||
'libphonenumber\\CountryCodeToRegionCodeMapForTesting' => __DIR__ . '/..' . '/giggsey/libphonenumber-for-php-lite/src/CountryCodeToRegionCodeMapForTesting.php',
|
||||
|
|
|
|||
|
|
@ -1851,6 +1851,57 @@
|
|||
},
|
||||
"install-path": "../justinrainbow/json-schema"
|
||||
},
|
||||
{
|
||||
"name": "kornrunner/blurhash",
|
||||
"version": "v1.2.2",
|
||||
"version_normalized": "1.2.2.0",
|
||||
"source": {
|
||||
"type": "git",
|
||||
"url": "https://github.com/kornrunner/php-blurhash.git",
|
||||
"reference": "bc8a4596cb0a49874f0158696a382ab3933fefe4"
|
||||
},
|
||||
"dist": {
|
||||
"type": "zip",
|
||||
"url": "https://api.github.com/repos/kornrunner/php-blurhash/zipball/bc8a4596cb0a49874f0158696a382ab3933fefe4",
|
||||
"reference": "bc8a4596cb0a49874f0158696a382ab3933fefe4",
|
||||
"shasum": ""
|
||||
},
|
||||
"require": {
|
||||
"php": "^7.3|^8.0"
|
||||
},
|
||||
"require-dev": {
|
||||
"ext-gd": "*",
|
||||
"ocramius/package-versions": "^1.4|^2.0",
|
||||
"phpstan/phpstan": "^0.12",
|
||||
"phpunit/phpunit": "^9",
|
||||
"vimeo/psalm": "^4.3"
|
||||
},
|
||||
"time": "2022-07-13T19:38:39+00:00",
|
||||
"type": "library",
|
||||
"installation-source": "dist",
|
||||
"autoload": {
|
||||
"psr-4": {
|
||||
"kornrunner\\Blurhash\\": "src"
|
||||
}
|
||||
},
|
||||
"notification-url": "https://packagist.org/downloads/",
|
||||
"license": [
|
||||
"MIT"
|
||||
],
|
||||
"authors": [
|
||||
{
|
||||
"name": "Boris Momčilović",
|
||||
"email": "boris.momcilovic@gmail.com"
|
||||
}
|
||||
],
|
||||
"description": "Pure PHP implementation of Blurhash",
|
||||
"homepage": "https://github.com/kornrunner/php-blurhash",
|
||||
"support": {
|
||||
"issues": "https://github.com/kornrunner/php-blurhash/issues",
|
||||
"source": "https://github.com/kornrunner/php-blurhash.git"
|
||||
},
|
||||
"install-path": "../kornrunner/blurhash"
|
||||
},
|
||||
{
|
||||
"name": "laravel/serializable-closure",
|
||||
"version": "v1.2.2",
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
'name' => 'nextcloud/3rdparty',
|
||||
'pretty_version' => 'dev-master',
|
||||
'version' => 'dev-master',
|
||||
'reference' => '8417c6d97148318316957adc082f7f50e5ea6e0e',
|
||||
'reference' => '5b8a5fc015968956a000d269561cb5ec9d931870',
|
||||
'type' => 'library',
|
||||
'install_path' => __DIR__ . '/../',
|
||||
'aliases' => array(),
|
||||
|
|
@ -235,6 +235,15 @@
|
|||
'aliases' => array(),
|
||||
'dev_requirement' => false,
|
||||
),
|
||||
'kornrunner/blurhash' => array(
|
||||
'pretty_version' => 'v1.2.2',
|
||||
'version' => '1.2.2.0',
|
||||
'reference' => 'bc8a4596cb0a49874f0158696a382ab3933fefe4',
|
||||
'type' => 'library',
|
||||
'install_path' => __DIR__ . '/../kornrunner/blurhash',
|
||||
'aliases' => array(),
|
||||
'dev_requirement' => false,
|
||||
),
|
||||
'laravel/serializable-closure' => array(
|
||||
'pretty_version' => 'v1.2.2',
|
||||
'version' => '1.2.2.0',
|
||||
|
|
@ -310,7 +319,7 @@
|
|||
'nextcloud/3rdparty' => array(
|
||||
'pretty_version' => 'dev-master',
|
||||
'version' => 'dev-master',
|
||||
'reference' => '8417c6d97148318316957adc082f7f50e5ea6e0e',
|
||||
'reference' => '5b8a5fc015968956a000d269561cb5ec9d931870',
|
||||
'type' => 'library',
|
||||
'install_path' => __DIR__ . '/../',
|
||||
'aliases' => array(),
|
||||
|
|
|
|||
|
|
@ -0,0 +1,21 @@
|
|||
MIT License
|
||||
|
||||
Copyright (c) 2019 Boris Momčilović
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
|
|
@ -0,0 +1,34 @@
|
|||
<?php
|
||||
|
||||
namespace kornrunner\Blurhash;
|
||||
|
||||
final class AC {
|
||||
|
||||
public static function encode(array $value, float $max_value): float {
|
||||
$quant_r = static::quantise($value[0] / $max_value);
|
||||
$quant_g = static::quantise($value[1] / $max_value);
|
||||
$quant_b = static::quantise($value[2] / $max_value);
|
||||
return $quant_r * 19 * 19 + $quant_g * 19 + $quant_b;
|
||||
}
|
||||
|
||||
public static function decode(int $value, float $max_value): array {
|
||||
$quant_r = intdiv($value, 19 * 19);
|
||||
$quant_g = intdiv($value, 19) % 19;
|
||||
$quant_b = $value % 19;
|
||||
|
||||
return [
|
||||
static::signPow(($quant_r - 9) / 9, 2) * $max_value,
|
||||
static::signPow(($quant_g - 9) / 9, 2) * $max_value,
|
||||
static::signPow(($quant_b - 9) / 9, 2) * $max_value
|
||||
];
|
||||
}
|
||||
|
||||
private static function quantise(float $value): float {
|
||||
return floor(max(0, min(18, floor(static::signPow($value, 0.5) * 9 + 9.5))));
|
||||
}
|
||||
|
||||
private static function signPow(float $base, float $exp): float {
|
||||
$sign = $base <=> 0;
|
||||
return $sign * pow(abs($base), $exp);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,39 @@
|
|||
<?php
|
||||
|
||||
namespace kornrunner\Blurhash;
|
||||
|
||||
use InvalidArgumentException;
|
||||
|
||||
class Base83 {
|
||||
private const ALPHABET = [
|
||||
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
|
||||
'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
|
||||
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
|
||||
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
|
||||
'u', 'v', 'w', 'x', 'y', 'z', '#', '$', '%', '*', '+', ',', '-', '.',
|
||||
':', ';', '=', '?', '@', '[', ']', '^', '_', '{', '|', '}', '~'
|
||||
];
|
||||
|
||||
private const BASE = 83;
|
||||
|
||||
public static function encode(int $value, int $length): string {
|
||||
if (intdiv($value, self::BASE ** $length) != 0) {
|
||||
throw new InvalidArgumentException('Specified length is too short to encode given value.');
|
||||
}
|
||||
|
||||
$result = '';
|
||||
for ($i = 1; $i <= $length; $i++) {
|
||||
$digit = intdiv($value, self::BASE ** ($length - $i)) % self::BASE;
|
||||
$result .= self::ALPHABET[$digit];
|
||||
}
|
||||
return $result;
|
||||
}
|
||||
|
||||
public static function decode(string $hash): int {
|
||||
$result = 0;
|
||||
foreach (str_split($hash) as $char) {
|
||||
$result = $result * self::BASE + (int) array_search($char, self::ALPHABET, true);
|
||||
}
|
||||
return $result;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,139 @@
|
|||
<?php
|
||||
|
||||
namespace kornrunner\Blurhash;
|
||||
|
||||
use InvalidArgumentException;
|
||||
|
||||
class Blurhash {
|
||||
|
||||
public static function encode(array $image, int $components_x = 4, int $components_y = 4, bool $linear = false): string {
|
||||
if (($components_x < 1 || $components_x > 9) || ($components_y < 1 || $components_y > 9)) {
|
||||
throw new InvalidArgumentException("x and y component counts must be between 1 and 9 inclusive.");
|
||||
}
|
||||
$height = count($image);
|
||||
$width = count($image[0]);
|
||||
|
||||
$image_linear = $image;
|
||||
if (!$linear) {
|
||||
$image_linear = [];
|
||||
for ($y = 0; $y < $height; $y++) {
|
||||
$line = [];
|
||||
for ($x = 0; $x < $width; $x++) {
|
||||
$pixel = $image[$y][$x];
|
||||
$line[] = [
|
||||
Color::toLinear($pixel[0]),
|
||||
Color::toLinear($pixel[1]),
|
||||
Color::toLinear($pixel[2])
|
||||
];
|
||||
}
|
||||
$image_linear[] = $line;
|
||||
}
|
||||
}
|
||||
|
||||
$components = [];
|
||||
$scale = 1 / ($width * $height);
|
||||
for ($y = 0; $y < $components_y; $y++) {
|
||||
for ($x = 0; $x < $components_x; $x++) {
|
||||
$normalisation = $x == 0 && $y == 0 ? 1 : 2;
|
||||
$r = $g = $b = 0;
|
||||
for ($i = 0; $i < $width; $i++) {
|
||||
for ($j = 0; $j < $height; $j++) {
|
||||
$color = $image_linear[$j][$i];
|
||||
$basis = $normalisation
|
||||
* cos(M_PI * $i * $x / $width)
|
||||
* cos(M_PI * $j * $y / $height);
|
||||
|
||||
$r += $basis * $color[0];
|
||||
$g += $basis * $color[1];
|
||||
$b += $basis * $color[2];
|
||||
}
|
||||
}
|
||||
|
||||
$components[] = [
|
||||
$r * $scale,
|
||||
$g * $scale,
|
||||
$b * $scale
|
||||
];
|
||||
}
|
||||
}
|
||||
|
||||
$dc_value = DC::encode(array_shift($components) ?: []);
|
||||
|
||||
$max_ac_component = 0;
|
||||
foreach ($components as $component) {
|
||||
$component[] = $max_ac_component;
|
||||
$max_ac_component = max ($component);
|
||||
}
|
||||
|
||||
$quant_max_ac_component = (int) max(0, min(82, floor($max_ac_component * 166 - 0.5)));
|
||||
$ac_component_norm_factor = ($quant_max_ac_component + 1) / 166;
|
||||
|
||||
$ac_values = [];
|
||||
foreach ($components as $component) {
|
||||
$ac_values[] = AC::encode($component, $ac_component_norm_factor);
|
||||
}
|
||||
|
||||
$blurhash = Base83::encode($components_x - 1 + ($components_y - 1) * 9, 1);
|
||||
$blurhash .= Base83::encode($quant_max_ac_component, 1);
|
||||
$blurhash .= Base83::encode($dc_value, 4);
|
||||
foreach ($ac_values as $ac_value) {
|
||||
$blurhash .= Base83::encode((int) $ac_value, 2);
|
||||
}
|
||||
|
||||
return $blurhash;
|
||||
}
|
||||
|
||||
public static function decode (string $blurhash, int $width, int $height, float $punch = 1.0, bool $linear = false): array {
|
||||
if (empty($blurhash) || strlen($blurhash) < 6) {
|
||||
throw new InvalidArgumentException("Blurhash string must be at least 6 characters");
|
||||
}
|
||||
|
||||
$size_info = Base83::decode($blurhash[0]);
|
||||
$size_y = intdiv($size_info, 9) + 1;
|
||||
$size_x = ($size_info % 9) + 1;
|
||||
|
||||
$length = strlen($blurhash);
|
||||
$expected_length = (int) (4 + (2 * $size_y * $size_x));
|
||||
if ($length !== $expected_length) {
|
||||
throw new InvalidArgumentException("Blurhash length mismatch: length is {$length} but it should be {$expected_length}");
|
||||
}
|
||||
|
||||
$colors = [DC::decode(Base83::decode(substr($blurhash, 2, 4)))];
|
||||
|
||||
$quant_max_ac_component = Base83::decode($blurhash[1]);
|
||||
$max_value = ($quant_max_ac_component + 1) / 166;
|
||||
for ($i = 1; $i < $size_x * $size_y; $i++) {
|
||||
$value = Base83::decode(substr($blurhash, 4 + $i * 2, 2));
|
||||
$colors[$i] = AC::decode($value, $max_value * $punch);
|
||||
}
|
||||
|
||||
$pixels = [];
|
||||
for ($y = 0; $y < $height; $y++) {
|
||||
$row = [];
|
||||
for ($x = 0; $x < $width; $x++) {
|
||||
$r = $g = $b = 0;
|
||||
for ($j = 0; $j < $size_y; $j++) {
|
||||
for ($i = 0; $i < $size_x; $i++) {
|
||||
$color = $colors[$i + $j * $size_x];
|
||||
$basis =
|
||||
cos((M_PI * $x * $i) / $width) *
|
||||
cos((M_PI * $y * $j) / $height);
|
||||
|
||||
$r += $color[0] * $basis;
|
||||
$g += $color[1] * $basis;
|
||||
$b += $color[2] * $basis;
|
||||
}
|
||||
}
|
||||
|
||||
$row[] = $linear ? [$r, $g, $b] : [
|
||||
Color::toSRGB($r),
|
||||
Color::toSRGB($g),
|
||||
Color::toSRGB($b)
|
||||
];
|
||||
}
|
||||
$pixels[] = $row;
|
||||
}
|
||||
|
||||
return $pixels;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
<?php
|
||||
|
||||
namespace kornrunner\Blurhash;
|
||||
|
||||
final class Color {
|
||||
public static function toLinear(int $value): float {
|
||||
$value = $value / 255;
|
||||
return ($value <= 0.04045)
|
||||
? $value / 12.92
|
||||
: pow(($value + 0.055) / 1.055, 2.4);
|
||||
}
|
||||
|
||||
public static function tosRGB(float $value): int {
|
||||
$normalized = max(0, min(1, $value));
|
||||
$result = ($normalized <= 0.0031308)
|
||||
? (int) round($normalized * 12.92 * 255 + 0.5)
|
||||
: (int) round((1.055 * pow($normalized, 1 / 2.4) - 0.055) * 255 + 0.5);
|
||||
return max(0, min($result, 255));
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,24 @@
|
|||
<?php
|
||||
|
||||
namespace kornrunner\Blurhash;
|
||||
|
||||
final class DC {
|
||||
|
||||
public static function encode(array $value): int {
|
||||
$rounded_r = Color::tosRGB($value[0]);
|
||||
$rounded_g = Color::tosRGB($value[1]);
|
||||
$rounded_b = Color::tosRGB($value[2]);
|
||||
return ($rounded_r << 16) + ($rounded_g << 8) + $rounded_b;
|
||||
}
|
||||
|
||||
public static function decode(int $value): array {
|
||||
$r = $value >> 16;
|
||||
$g = ($value >> 8) & 255;
|
||||
$b = $value & 255;
|
||||
return [
|
||||
Color::toLinear($r),
|
||||
Color::toLinear($g),
|
||||
Color::toLinear($b)
|
||||
];
|
||||
}
|
||||
}
|
||||
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