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123 lines
2.8 KiB
PHP
123 lines
2.8 KiB
PHP
<?php
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/*
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* This file is part of the Imagine package.
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*
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* (c) Bulat Shakirzyanov <mallluhuct@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Imagine\Image\Palette;
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use Imagine\Image\Palette\Color\Gray as GrayColor;
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use Imagine\Image\Palette\Color\ColorInterface;
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use Imagine\Image\ProfileInterface;
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use Imagine\Image\Profile;
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use Imagine\Exception\RuntimeException;
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class Grayscale implements PaletteInterface
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{
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/**
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* @var ColorParser
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*/
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private $parser;
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/**
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* @var ProfileInterface
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*/
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private $profile;
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/**
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* @var array
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*/
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protected static $colors = array();
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public function __construct()
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{
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$this->parser = new ColorParser();
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}
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/**
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* {@inheritdoc}
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*/
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public function name()
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{
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return PaletteInterface::PALETTE_GRAYSCALE;
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}
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/**
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* {@inheritdoc}
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*/
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public function pixelDefinition()
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{
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return array(ColorInterface::COLOR_GRAY);
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}
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/**
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* {@inheritdoc}
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*/
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public function supportsAlpha()
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{
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return true;
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}
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/**
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* {@inheritdoc}
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*/
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public function useProfile(ProfileInterface $profile)
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{
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$this->profile = $profile;
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return $this;
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}
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/**
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* {@inheritdoc}
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*/
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public function profile()
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{
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if (!$this->profile) {
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$this->profile = Profile::fromPath(__DIR__ . '/../../resources/colormanagement.org/ISOcoated_v2_grey1c_bas.ICC');
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}
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return $this->profile;
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}
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/**
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* {@inheritdoc}
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*/
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public function color($color, $alpha = null)
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{
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if (null === $alpha) {
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$alpha = 0;
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}
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$color = $this->parser->parseToGrayscale($color);
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$index = sprintf('#%02x%02x%02x-%d', $color[0], $color[0], $color[0], $alpha);
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if (false === array_key_exists($index, static::$colors)) {
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static::$colors[$index] = new GrayColor($this, $color, $alpha);
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}
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return static::$colors[$index];
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}
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/**
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* {@inheritdoc}
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*/
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public function blend(ColorInterface $color1, ColorInterface $color2, $amount)
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{
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if (!$color1 instanceof GrayColor || ! $color2 instanceof GrayColor) {
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throw new RuntimeException('Grayscale palette can only blend Grayscale colors');
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}
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return $this->color(
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array(
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(int) min(255, min($color1->getGray(), $color2->getGray()) + round(abs($color2->getGray() - $color1->getGray()) * $amount)),
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),
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(int) min(100, min($color1->getAlpha(), $color2->getAlpha()) + round(abs($color2->getAlpha() - $color1->getAlpha()) * $amount))
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);
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}
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}
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