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<?php
/*
* This file is part of the Imagine package.
*
* (c) Bulat Shakirzyanov <mallluhuct@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Imagine\Gd;
use Imagine\Image\AbstractImagine;
use Imagine\Image\Metadata\MetadataBag;
use Imagine\Image\Palette\Color\ColorInterface;
use Imagine\Image\Palette\RGB;
use Imagine\Image\Palette\PaletteInterface;
use Imagine\Image\BoxInterface;
use Imagine\Image\Palette\Color\RGB as RGBColor;
use Imagine\Exception\InvalidArgumentException;
use Imagine\Exception\RuntimeException;
/**
* Imagine implementation using the GD library
*/
final class Imagine extends AbstractImagine
{
/**
* @var array
*/
private $info;
/**
* @throws RuntimeException
*/
public function __construct()
{
$this->loadGdInfo();
$this->requireGdVersion('2.0.1');
}
/**
* {@inheritdoc}
*/
public function create(BoxInterface $size, ColorInterface $color = null)
{
$width = $size->getWidth();
$height = $size->getHeight();
$resource = imagecreatetruecolor($width, $height);
if (false === $resource) {
throw new RuntimeException('Create operation failed');
}
$palette = null !== $color ? $color->getPalette() : new RGB();
$color = $color ? $color : $palette->color('fff');
if (!$color instanceof RGBColor) {
throw new InvalidArgumentException('GD driver only supports RGB colors');
}
$index = imagecolorallocatealpha($resource, $color->getRed(), $color->getGreen(), $color->getBlue(), round(127 * (100 - $color->getAlpha()) / 100));
if (false === $index) {
throw new RuntimeException('Unable to allocate color');
}
if (false === imagefill($resource, 0, 0, $index)) {
throw new RuntimeException('Could not set background color fill');
}
if ($color->getAlpha() >= 95) {
imagecolortransparent($resource, $index);
}
return $this->wrap($resource, $palette, new MetadataBag());
}
/**
* {@inheritdoc}
*/
public function open($path)
{
$path = $this->checkPath($path);
$data = @file_get_contents($path);
if (false === $data) {
throw new RuntimeException(sprintf('Failed to open file %s', $path));
}
$resource = @imagecreatefromstring($data);
if (!is_resource($resource)) {
throw new RuntimeException(sprintf('Unable to open image %s', $path));
}
return $this->wrap($resource, new RGB(), $this->getMetadataReader()->readFile($path));
}
/**
* {@inheritdoc}
*/
public function load($string)
{
return $this->doLoad($string, $this->getMetadataReader()->readData($string));
}
/**
* {@inheritdoc}
*/
public function read($resource)
{
if (!is_resource($resource)) {
throw new InvalidArgumentException('Variable does not contain a stream resource');
}
$content = stream_get_contents($resource);
if (false === $content) {
throw new InvalidArgumentException('Cannot read resource content');
}
return $this->doLoad($content, $this->getMetadataReader()->readStream($resource));
}
/**
* {@inheritdoc}
*/
public function font($file, $size, ColorInterface $color)
{
if (!$this->info['FreeType Support']) {
throw new RuntimeException('GD is not compiled with FreeType support');
}
return new Font($file, $size, $color);
}
private function wrap($resource, PaletteInterface $palette, MetadataBag $metadata)
{
if (!imageistruecolor($resource)) {
list($width, $height) = array(imagesx($resource), imagesy($resource));
// create transparent truecolor canvas
$truecolor = imagecreatetruecolor($width, $height);
$transparent = imagecolorallocatealpha($truecolor, 255, 255, 255, 127);
imagefill($truecolor, 0, 0, $transparent);
imagecolortransparent($truecolor, $transparent);
imagecopymerge($truecolor, $resource, 0, 0, 0, 0, $width, $height, 100);
imagedestroy($resource);
$resource = $truecolor;
}
if (false === imagealphablending($resource, false) || false === imagesavealpha($resource, true)) {
throw new RuntimeException('Could not set alphablending, savealpha and antialias values');
}
if (function_exists('imageantialias')) {
imageantialias($resource, true);
}
return new Image($resource, $palette, $metadata);
}
private function loadGdInfo()
{
if (!function_exists('gd_info')) {
throw new RuntimeException('Gd not installed');
}
$this->info = gd_info();
}
private function requireGdVersion($version)
{
if (version_compare(GD_VERSION, $version, '<')) {
throw new RuntimeException(sprintf('GD2 version %s or higher is required', $version));
}
}
private function doLoad($string, MetadataBag $metadata)
{
$resource = @imagecreatefromstring($string);
if (!is_resource($resource)) {
throw new RuntimeException('An image could not be created from the given input');
}
return $this->wrap($resource, new RGB(), $metadata);
}
}
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