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88.3

/src/Utils/Image.php

<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */

declare(strict_types=1);

namespace Nette\Utils;

use Nette;


/**
 * Basic manipulation with images. Supported types are JPEG, PNG, GIF, WEBP, AVIF and BMP.
 *
 * <code>
 * $image = Image::fromFile('nette.jpg');
 * $image->resize(150, 100);
 * $image->sharpen();
 * $image->send();
 * </code>
 *
 * @method Image affine(array $affine, array $clip = null)
 * @method array affineMatrixConcat(array $m1, array $m2)
 * @method array affineMatrixGet(int $type, mixed $options = null)
 * @method void alphaBlending(bool $on)
 * @method void antialias(bool $on)
 * @method void arc($x, $y, $w, $h, $start, $end, $color)
 * @method void char(int $font, $x, $y, string $char, $color)
 * @method void charUp(int $font, $x, $y, string $char, $color)
 * @method int colorAllocate($red, $green, $blue)
 * @method int colorAllocateAlpha($red, $green, $blue, $alpha)
 * @method int colorAt($x, $y)
 * @method int colorClosest($red, $green, $blue)
 * @method int colorClosestAlpha($red, $green, $blue, $alpha)
 * @method int colorClosestHWB($red, $green, $blue)
 * @method void colorDeallocate($color)
 * @method int colorExact($red, $green, $blue)
 * @method int colorExactAlpha($red, $green, $blue, $alpha)
 * @method void colorMatch(Image $image2)
 * @method int colorResolve($red, $green, $blue)
 * @method int colorResolveAlpha($red, $green, $blue, $alpha)
 * @method void colorSet($index, $red, $green, $blue)
 * @method array colorsForIndex($index)
 * @method int colorsTotal()
 * @method int colorTransparent($color = null)
 * @method void convolution(array $matrix, float $div, float $offset)
 * @method void copy(Image $src, $dstX, $dstY, $srcX, $srcY, $srcW, $srcH)
 * @method void copyMerge(Image $src, $dstX, $dstY, $srcX, $srcY, $srcW, $srcH, $opacity)
 * @method void copyMergeGray(Image $src, $dstX, $dstY, $srcX, $srcY, $srcW, $srcH, $opacity)
 * @method void copyResampled(Image $src, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH)
 * @method void copyResized(Image $src, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH)
 * @method Image cropAuto(int $mode = -1, float $threshold = .5, int $color = -1)
 * @method void ellipse($cx, $cy, $w, $h, $color)
 * @method void fill($x, $y, $color)
 * @method void filledArc($cx, $cy, $w, $h, $s, $e, $color, $style)
 * @method void filledEllipse($cx, $cy, $w, $h, $color)
 * @method void filledPolygon(array $points, $numPoints, $color)
 * @method void filledRectangle($x1, $y1, $x2, $y2, $color)
 * @method void fillToBorder($x, $y, $border, $color)
 * @method void filter($filtertype)
 * @method void flip(int $mode)
 * @method array ftText($size, $angle, $x, $y, $col, string $fontFile, string $text, array $extrainfo = null)
 * @method void gammaCorrect(float $inputgamma, float $outputgamma)
 * @method array getClip()
 * @method int interlace($interlace = null)
 * @method bool isTrueColor()
 * @method void layerEffect($effect)
 * @method void line($x1, $y1, $x2, $y2, $color)
 * @method void openPolygon(array $points, int $num_points, int $color)
 * @method void paletteCopy(Image $source)
 * @method void paletteToTrueColor()
 * @method void polygon(array $points, $numPoints, $color)
 * @method array psText(string $text, $font, $size, $color, $backgroundColor, $x, $y, $space = null, $tightness = null, float $angle = null, $antialiasSteps = null)
 * @method void rectangle($x1, $y1, $x2, $y2, $col)
 * @method mixed resolution(int $res_x = null, int $res_y = null)
 * @method Image rotate(float $angle, $backgroundColor)
 * @method void saveAlpha(bool $saveflag)
 * @method Image scale(int $newWidth, int $newHeight = -1, int $mode = IMG_BILINEAR_FIXED)
 * @method void setBrush(Image $brush)
 * @method void setClip(int $x1, int $y1, int $x2, int $y2)
 * @method void setInterpolation(int $method = IMG_BILINEAR_FIXED)
 * @method void setPixel($x, $y, $color)
 * @method void setStyle(array $style)
 * @method void setThickness($thickness)
 * @method void setTile(Image $tile)
 * @method void string($font, $x, $y, string $s, $col)
 * @method void stringUp($font, $x, $y, string $s, $col)
 * @method void trueColorToPalette(bool $dither, $ncolors)
 * @method array ttfText($size, $angle, $x, $y, $color, string $fontfile, string $text)
 * @property-read positive-int $width
 * @property-read positive-int $height
 * @property-read resource|\GdImage $imageResource
 */
class Image
{
        use Nette\SmartObject;

        /** Prevent from getting resized to a bigger size than the original */
        public const SHRINK_ONLY = 0b0001;

        /** Resizes to a specified width and height without keeping aspect ratio */
        public const STRETCH = 0b0010;

        /** Resizes to fit into a specified width and height and preserves aspect ratio */
        public const FIT = 0b0000;

        /** Resizes while bounding the smaller dimension to the specified width or height and preserves aspect ratio */
        public const FILL = 0b0100;

        /** Resizes to the smallest possible size to completely cover specified width and height and reserves aspect ratio */
        public const EXACT = 0b1000;

        /** image types */
        public const
                JPEG = IMAGETYPE_JPEG,
                PNG = IMAGETYPE_PNG,
                GIF = IMAGETYPE_GIF,
                WEBP = IMAGETYPE_WEBP,
                AVIF = 19, // IMAGETYPE_AVIF,
                BMP = IMAGETYPE_BMP;

        public const EMPTY_GIF = "GIF89a\x01\x00\x01\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00!\xf9\x04\x01\x00\x00\x00\x00,\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02D\x01\x00;";

        private const Formats = [self::JPEG => 'jpeg', self::PNG => 'png', self::GIF => 'gif', self::WEBP => 'webp', self::AVIF => 'avif', self::BMP => 'bmp'];

        /** @var resource|\GdImage */
        private $image;


        /**
         * Returns RGB color (0..255) and transparency (0..127).
         */
        public static function rgb(int $red, int $green, int $blue, int $transparency = 0): array
        {
                return [
                        'red' => max(0, min(255, $red)),
                        'green' => max(0, min(255, $green)),
                        'blue' => max(0, min(255, $blue)),
                        'alpha' => max(0, min(127, $transparency)),
                ];
        }


        /**
         * Reads an image from a file and returns its type in $type.
         * @throws Nette\NotSupportedException if gd extension is not loaded
         * @throws UnknownImageFileException if file not found or file type is not known
         * @return static
         */
        public static function fromFile(string $file, ?int &$type = null)
        {
                if (!extension_loaded('gd')) {
                        throw new Nette\NotSupportedException('PHP extension GD is not loaded.');
                }

                $type = self::detectTypeFromFile($file);
                if (!$type) {
                        throw new UnknownImageFileException(is_file($file) ? "Unknown type of file '$file'." : "File '$file' not found.");
                }

                return self::invokeSafe('imagecreatefrom' . self::Formats[$type], $file, "Unable to open file '$file'.", __METHOD__);
        }


        /**
         * Reads an image from a string and returns its type in $type.
         * @return static
         * @throws Nette\NotSupportedException if gd extension is not loaded
         * @throws ImageException
         */
        public static function fromString(string $s, ?int &$type = null)
        {
                if (!extension_loaded('gd')) {
                        throw new Nette\NotSupportedException('PHP extension GD is not loaded.');
                }

                $type = self::detectTypeFromString($s);
                if (!$type) {
                        throw new UnknownImageFileException('Unknown type of image.');
                }

                return self::invokeSafe('imagecreatefromstring', $s, 'Unable to open image from string.', __METHOD__);
        }


        private static function invokeSafe(string $func, string $arg, string $message, string $callee): self
        {
                $errors = [];
                $res = Callback::invokeSafe($func, [$arg], function (string $message) use (&$errors): void {
                        $errors[] = $message;
                });

                if (!$res) {
                        throw new ImageException($message . ' Errors: ' . implode(', ', $errors));
                } elseif ($errors) {
                        trigger_error($callee . '(): ' . implode(', ', $errors), E_USER_WARNING);
                }

                return new static($res);
        }


        /**
         * Creates a new true color image of the given dimensions. The default color is black.
         * @param  positive-int  $width
         * @param  positive-int  $height
         * @return static
         * @throws Nette\NotSupportedException if gd extension is not loaded
         */
        public static function fromBlank(int $width, int $height, ?array $color = null)
        {
                if (!extension_loaded('gd')) {
                        throw new Nette\NotSupportedException('PHP extension GD is not loaded.');
                }

                if ($width < 1 || $height < 1) {
                        throw new Nette\InvalidArgumentException('Image width and height must be greater than zero.');
                }

                $image = imagecreatetruecolor($width, $height);
                if ($color) {
                        $color += ['alpha' => 0];
                        $color = imagecolorresolvealpha($image, $color['red'], $color['green'], $color['blue'], $color['alpha']);
                        imagealphablending($image, false);
                        imagefilledrectangle($image, 0, 0, $width - 1, $height - 1, $color);
                        imagealphablending($image, true);
                }

                return new static($image);
        }


        /**
         * Returns the type of image from file.
         */
        public static function detectTypeFromFile(string $file, &$width = null, &$height = null): ?int
        {
                [$width, $height, $type] = @getimagesize($file); // @ - files smaller than 12 bytes causes read error
                return isset(self::Formats[$type]) ? $type : null;
        }


        /**
         * Returns the type of image from string.
         */
        public static function detectTypeFromString(string $s, &$width = null, &$height = null): ?int
        {
                [$width, $height, $type] = @getimagesizefromstring($s); // @ - strings smaller than 12 bytes causes read error
                return isset(self::Formats[$type]) ? $type : null;
        }


        /**
         * Returns the file extension for the given `Image::XXX` constant.
         */
        public static function typeToExtension(int $type): string
        {
                if (!isset(self::Formats[$type])) {
                        throw new Nette\InvalidArgumentException("Unsupported image type '$type'.");
                }

                return self::Formats[$type];
        }


        /**
         * Returns the `Image::XXX` constant for given file extension.
         */
        public static function extensionToType(string $extension): int
        {
                $extensions = array_flip(self::Formats) + ['jpg' => self::JPEG];
                $extension = strtolower($extension);
                if (!isset($extensions[$extension])) {
                        throw new Nette\InvalidArgumentException("Unsupported file extension '$extension'.");
                }

                return $extensions[$extension];
        }


        /**
         * Returns the mime type for the given `Image::XXX` constant.
         */
        public static function typeToMimeType(int $type): string
        {
                return 'image/' . self::typeToExtension($type);
        }


        /**
         * Wraps GD image.
         * @param  resource|\GdImage  $image
         */
        public function __construct($image)
        {
                $this->setImageResource($image);
                imagesavealpha($image, true);
        }


        /**
         * Returns image width.
         * @return positive-int
         */
        public function getWidth(): int
        {
                return imagesx($this->image);
        }


        /**
         * Returns image height.
         * @return positive-int
         */
        public function getHeight(): int
        {
                return imagesy($this->image);
        }


        /**
         * Sets image resource.
         * @param  resource|\GdImage  $image
         * @return static
         */
        protected function setImageResource($image)
        {
                if (!$image instanceof \GdImage && !(is_resource($image) && get_resource_type($image) === 'gd')) {
                        throw new Nette\InvalidArgumentException('Image is not valid.');
                }

                $this->image = $image;
                return $this;
        }


        /**
         * Returns image GD resource.
         * @return resource|\GdImage
         */
        public function getImageResource()
        {
                return $this->image;
        }


        /**
         * Scales an image.
         * @param  int|string|null  $width in pixels or percent
         * @param  int|string|null  $height in pixels or percent
         * @return static
         */
        public function resize($width, $height, int $flags = self::FIT)
        {
                if ($flags & self::EXACT) {
                        return $this->resize($width, $height, self::FILL)->crop('50%', '50%', $width, $height);
                }

                [$newWidth, $newHeight] = static::calculateSize($this->getWidth(), $this->getHeight(), $width, $height, $flags);

                if ($newWidth !== $this->getWidth() || $newHeight !== $this->getHeight()) { // resize
                        $newImage = static::fromBlank($newWidth, $newHeight, self::rgb(0, 0, 0, 127))->getImageResource();
                        imagecopyresampled(
                                $newImage,
                                $this->image,
                                0,
                                0,
                                0,
                                0,
                                $newWidth,
                                $newHeight,
                                $this->getWidth(),
                                $this->getHeight()
                        );
                        $this->image = $newImage;
                }

                if ($width < 0 || $height < 0) {
                        imageflip($this->image, $width < 0 ? ($height < 0 ? IMG_FLIP_BOTH : IMG_FLIP_HORIZONTAL) : IMG_FLIP_VERTICAL);
                }

                return $this;
        }


        /**
         * Calculates dimensions of resized image.
         * @param  int|string|null  $newWidth in pixels or percent
         * @param  int|string|null  $newHeight in pixels or percent
         */
        public static function calculateSize(
                int $srcWidth,
                int $srcHeight,
                $newWidth,
                $newHeight,
                int $flags = self::FIT
        ): array
        {
                if ($newWidth === null) {
                } elseif (self::isPercent($newWidth)) {
                        $newWidth = (int) round($srcWidth / 100 * abs($newWidth));
                        $percents = true;
                } else {
                        $newWidth = abs($newWidth);
                }

                if ($newHeight === null) {
                } elseif (self::isPercent($newHeight)) {
                        $newHeight = (int) round($srcHeight / 100 * abs($newHeight));
                        $flags |= empty($percents) ? 0 : self::STRETCH;
                } else {
                        $newHeight = abs($newHeight);
                }

                if ($flags & self::STRETCH) { // non-proportional
                        if (!$newWidth || !$newHeight) {
                                throw new Nette\InvalidArgumentException('For stretching must be both width and height specified.');
                        }

                        if ($flags & self::SHRINK_ONLY) {
                                $newWidth = (int) round($srcWidth * min(1, $newWidth / $srcWidth));
                                $newHeight = (int) round($srcHeight * min(1, $newHeight / $srcHeight));
                        }
                } else {  // proportional
                        if (!$newWidth && !$newHeight) {
                                throw new Nette\InvalidArgumentException('At least width or height must be specified.');
                        }

                        $scale = [];
                        if ($newWidth > 0) { // fit width
                                $scale[] = $newWidth / $srcWidth;
                        }

                        if ($newHeight > 0) { // fit height
                                $scale[] = $newHeight / $srcHeight;
                        }

                        if ($flags & self::FILL) {
                                $scale = [max($scale)];
                        }

                        if ($flags & self::SHRINK_ONLY) {
                                $scale[] = 1;
                        }

                        $scale = min($scale);
                        $newWidth = (int) round($srcWidth * $scale);
                        $newHeight = (int) round($srcHeight * $scale);
                }

                return [max($newWidth, 1), max($newHeight, 1)];
        }


        /**
         * Crops image.
         * @param  int|string  $left in pixels or percent
         * @param  int|string  $top in pixels or percent
         * @param  int|string  $width in pixels or percent
         * @param  int|string  $height in pixels or percent
         * @return static
         */
        public function crop($left, $top, $width, $height)
        {
                [$r['x'], $r['y'], $r['width'], $r['height']]
                        = static::calculateCutout($this->getWidth(), $this->getHeight(), $left, $top, $width, $height);
                if (gd_info()['GD Version'] === 'bundled (2.1.0 compatible)') {
                        $this->image = imagecrop($this->image, $r);
                        imagesavealpha($this->image, true);
                } else {
                        $newImage = static::fromBlank($r['width'], $r['height'], self::RGB(0, 0, 0, 127))->getImageResource();
                        imagecopy($newImage, $this->image, 0, 0, $r['x'], $r['y'], $r['width'], $r['height']);
                        $this->image = $newImage;
                }

                return $this;
        }


        /**
         * Calculates dimensions of cutout in image.
         * @param  int|string  $left in pixels or percent
         * @param  int|string  $top in pixels or percent
         * @param  int|string  $newWidth in pixels or percent
         * @param  int|string  $newHeight in pixels or percent
         */
        public static function calculateCutout(int $srcWidth, int $srcHeight, $left, $top, $newWidth, $newHeight): array
        {
                if (self::isPercent($newWidth)) {
                        $newWidth = (int) round($srcWidth / 100 * $newWidth);
                }

                if (self::isPercent($newHeight)) {
                        $newHeight = (int) round($srcHeight / 100 * $newHeight);
                }

                if (self::isPercent($left)) {
                        $left = (int) round(($srcWidth - $newWidth) / 100 * $left);
                }

                if (self::isPercent($top)) {
                        $top = (int) round(($srcHeight - $newHeight) / 100 * $top);
                }

                if ($left < 0) {
                        $newWidth += $left;
                        $left = 0;
                }

                if ($top < 0) {
                        $newHeight += $top;
                        $top = 0;
                }

                $newWidth = min($newWidth, $srcWidth - $left);
                $newHeight = min($newHeight, $srcHeight - $top);
                return [$left, $top, $newWidth, $newHeight];
        }


        /**
         * Sharpens image a little bit.
         * @return static
         */
        public function sharpen()
        {
                imageconvolution($this->image, [ // my magic numbers ;)
                        [-1, -1, -1],
                        [-1, 24, -1],
                        [-1, -1, -1],
                ], 16, 0);
                return $this;
        }


        /**
         * Puts another image into this image.
         * @param  int|string  $left in pixels or percent
         * @param  int|string  $top in pixels or percent
         * @param  int<0, 100>  $opacity 0..100
         * @return static
         */
        public function place(self $image, $left = 0, $top = 0, int $opacity = 100)
        {
                $opacity = max(0, min(100, $opacity));
                if ($opacity === 0) {
                        return $this;
                }

                $width = $image->getWidth();
                $height = $image->getHeight();

                if (self::isPercent($left)) {
                        $left = (int) round(($this->getWidth() - $width) / 100 * $left);
                }

                if (self::isPercent($top)) {
                        $top = (int) round(($this->getHeight() - $height) / 100 * $top);
                }

                $output = $input = $image->image;
                if ($opacity < 100) {
                        $tbl = [];
                        for ($i = 0; $i < 128; $i++) {
                                $tbl[$i] = round(127 - (127 - $i) * $opacity / 100);
                        }

                        $output = imagecreatetruecolor($width, $height);
                        imagealphablending($output, false);
                        if (!$image->isTrueColor()) {
                                $input = $output;
                                imagefilledrectangle($output, 0, 0, $width, $height, imagecolorallocatealpha($output, 0, 0, 0, 127));
                                imagecopy($output, $image->image, 0, 0, 0, 0, $width, $height);
                        }

                        for ($x = 0; $x < $width; $x++) {
                                for ($y = 0; $y < $height; $y++) {
                                        $c = \imagecolorat($input, $x, $y);
                                        $c = ($c & 0xFFFFFF) + ($tbl[$c >> 24] << 24);
                                        \imagesetpixel($output, $x, $y, $c);
                                }
                        }

                        imagealphablending($output, true);
                }

                imagecopy(
                        $this->image,
                        $output,
                        $left,
                        $top,
                        0,
                        0,
                        $width,
                        $height
                );
                return $this;
        }


        /**
         * Saves image to the file. Quality is in the range 0..100 for JPEG (default 85), WEBP (default 80) and AVIF (default 30) and 0..9 for PNG (default 9).
         * @throws ImageException
         */
        public function save(string $file, ?int $quality = null, ?int $type = null): void
        {
                $type = $type ?? self::extensionToType(pathinfo($file, PATHINFO_EXTENSION));
                $this->output($type, $quality, $file);
        }


        /**
         * Outputs image to string. Quality is in the range 0..100 for JPEG (default 85), WEBP (default 80) and AVIF (default 30) and 0..9 for PNG (default 9).
         */
        public function toString(int $type = self::JPEG, ?int $quality = null): string
        {
                return Helpers::capture(function () use ($type, $quality) {
                        $this->output($type, $quality);
                });
        }


        /**
         * Outputs image to string.
         */
        public function __toString(): string
        {
                try {
                        return $this->toString();
                } catch (\Throwable $e) {
                        if (func_num_args() || PHP_VERSION_ID >= 70400) {
                                throw $e;
                        }

                        trigger_error('Exception in ' . __METHOD__ . "(): {$e->getMessage()} in {$e->getFile()}:{$e->getLine()}", E_USER_ERROR);
                        return '';
                }
        }


        /**
         * Outputs image to browser. Quality is in the range 0..100 for JPEG (default 85), WEBP (default 80) and AVIF (default 30) and 0..9 for PNG (default 9).
         * @throws ImageException
         */
        public function send(int $type = self::JPEG, ?int $quality = null): void
        {
                header('Content-Type: ' . self::typeToMimeType($type));
                $this->output($type, $quality);
        }


        /**
         * Outputs image to browser or file.
         * @throws ImageException
         */
        private function output(int $type, ?int $quality, ?string $file = null): void
        {
                switch ($type) {
                        case self::JPEG:
                                $quality = $quality === null ? 85 : max(0, min(100, $quality));
                                $success = @imagejpeg($this->image, $file, $quality); // @ is escalated to exception
                                break;

                        case self::PNG:
                                $quality = $quality === null ? 9 : max(0, min(9, $quality));
                                $success = @imagepng($this->image, $file, $quality); // @ is escalated to exception
                                break;

                        case self::GIF:
                                $success = @imagegif($this->image, $file); // @ is escalated to exception
                                break;

                        case self::WEBP:
                                $quality = $quality === null ? 80 : max(0, min(100, $quality));
                                $success = @imagewebp($this->image, $file, $quality); // @ is escalated to exception
                                break;

                        case self::AVIF:
                                $quality = $quality === null ? 30 : max(0, min(100, $quality));
                                $success = @imageavif($this->image, $file, $quality); // @ is escalated to exception
                                break;

                        case self::BMP:
                                $success = @imagebmp($this->image, $file); // @ is escalated to exception
                                break;

                        default:
                                throw new Nette\InvalidArgumentException("Unsupported image type '$type'.");
                }

                if (!$success) {
                        throw new ImageException(Helpers::getLastError() ?: 'Unknown error');
                }
        }


        /**
         * Call to undefined method.
         * @return mixed
         * @throws Nette\MemberAccessException
         */
        public function __call(string $name, array $args)
        {
                $function = 'image' . $name;
                if (!function_exists($function)) {
                        ObjectHelpers::strictCall(static::class, $name);
                }

                foreach ($args as $key => $value) {
                        if ($value instanceof self) {
                                $args[$key] = $value->getImageResource();

                        } elseif (is_array($value) && isset($value['red'])) { // rgb
                                $args[$key] = imagecolorallocatealpha(
                                        $this->image,
                                        $value['red'],
                                        $value['green'],
                                        $value['blue'],
                                        $value['alpha']
                                ) ?: imagecolorresolvealpha(
                                        $this->image,
                                        $value['red'],
                                        $value['green'],
                                        $value['blue'],
                                        $value['alpha']
                                );
                        }
                }

                $res = $function($this->image, ...$args);
                return $res instanceof \GdImage || (is_resource($res) && get_resource_type($res) === 'gd')
                        ? $this->setImageResource($res)
                        : $res;
        }


        public function __clone()
        {
                ob_start(function () {});
                imagepng($this->image, null, 0);
                $this->setImageResource(imagecreatefromstring(ob_get_clean()));
        }


        /**
         * @param  int|string  $num in pixels or percent
         */
        private static function isPercent(&$num): bool
        {
                if (is_string($num) && substr($num, -1) === '%') {
                        $num = (float) substr($num, 0, -1);
                        return true;
                } elseif (is_int($num) || $num === (string) (int) $num) {
                        $num = (int) $num;
                        return false;
                }

                throw new Nette\InvalidArgumentException("Expected dimension in int|string, '$num' given.");
        }


        /**
         * Prevents serialization.
         */
        public function __sleep(): array
        {
                throw new Nette\NotSupportedException('You cannot serialize or unserialize ' . self::class . ' instances.');
        }
}

nette / utils / 5707056869

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