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<?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 int $width * @property-read int $height * @property-read \GdImage $imageResource */ class Image { use Nette\SmartObject; /** Prevent from getting resized to a bigger size than the original */ public const ShrinkOnly = 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 OrSmaller = 0b0000; /** Resizes while bounding the smaller dimension to the specified width or height and preserves aspect ratio */ public const OrBigger = 0b0100; /** Resizes to the smallest possible size to completely cover specified width and height and reserves aspect ratio */ public const Cover = 0b1000; /** @deprecated use Image::ShrinkOnly */ public const SHRINK_ONLY = self::ShrinkOnly; /** @deprecated use Image::Stretch */ public const STRETCH = self::Stretch; /** @deprecated use Image::OrSmaller */ public const FIT = self::OrSmaller; /** @deprecated use Image::OrBigger */ public const FILL = self::OrBigger; /** @deprecated use Image::Cover */ public const EXACT = self::Cover; /** @deprecated use Image::EmptyGIF */ public const EMPTY_GIF = self::EmptyGIF; /** 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 EmptyGIF = "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']; private \GdImage $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 */ public static function fromFile(string $file, ?int &$type = null): static { 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. * @throws Nette\NotSupportedException if gd extension is not loaded * @throws ImageException */ public static function fromString(string $s, ?int &$type = null): static { 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): static { $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. * @throws Nette\NotSupportedException if gd extension is not loaded */ public static function fromBlank(int $width, int $height, ?array $color = null): static { if (!extension_loaded('gd')) { throw new Nette\NotSupportedException('PHP extension GD is not loaded.'); } if ($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. */ public function __construct(\GdImage $image) { $this->setImageResource($image); imagesavealpha($image, true); } /** * Returns image width. */ public function getWidth(): int { return imagesx($this->image); } /** * Returns image height. */ public function getHeight(): int { return imagesy($this->image); } /** * Sets image resource. */ protected function setImageResource(\GdImage $image): static { $this->image = $image; return $this; } /** * Returns image GD resource. */ public function getImageResource(): \GdImage { return $this->image; } /** * Scales an image. Width and height accept pixels or percent. * @param self::OrSmaller|self::OrBigger|self::Stretch|self::Cover|self::ShrinkOnly $mode */ public function resize(int|string|null $width, int|string|null $height, int $mode = self::OrSmaller): static { if ($mode & self::Cover) { return $this->resize($width, $height, self::OrBigger)->crop('50%', '50%', $width, $height); } [$newWidth, $newHeight] = static::calculateSize($this->getWidth(), $this->getHeight(), $width, $height, $mode); if ($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. Width and height accept pixels or percent. * @param self::OrSmaller|self::OrBigger|self::Stretch|self::Cover|self::ShrinkOnly $mode */ public static function calculateSize( int $srcWidth, int $srcHeight, $newWidth, $newHeight, int $mode = self::OrSmaller, ): array { if ($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)); $mode |= empty($percents) ? 0 : self::Stretch; } else { $newHeight = abs($newHeight); } if ($mode & self::Stretch) { // non-proportional if (!$newWidth || !$newHeight) { throw new Nette\InvalidArgumentException('For stretching must be both width and height specified.'); } if ($mode & self::ShrinkOnly) { $newWidth = min($srcWidth, $newWidth); $newHeight = min($srcHeight, $newHeight); } } else { // proportional if (!$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 / $srcHeight; } if ($mode & self::OrBigger) { $scale = [max($scale)]; } if ($mode & self::ShrinkOnly) { $scale[] = 1; } $scale = min($scale); $newWidth = (int) round($srcWidth * $scale); $newHeight = (int) round($srcHeight * $scale); } return [max($newWidth, 1), max($newHeight, 1)]; } /** * Crops image. Arguments accepts pixels or percent. */ public function crop(int|string $left, int|string $top, int|string $width, int|string $height): static { [$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. Arguments accepts pixels or percent. */ public static function calculateCutout( int $srcWidth, int $srcHeight, int|string $left, int|string $top, int|string $newWidth, int|string $newHeight, ): array { if (self::isPercent($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, $newHeight]; } /** * Sharpens image a little bit. */ public function sharpen(): static { imageconvolution($this->image, [ // my magic numbers ;) [-1, -1, -1], [-1, 24, -1], [-1, -1, -1], ], 16, 0); return $this; } /** * Puts another image into this image. Left and top accepts pixels or percent. * @param int $opacity 0..100 */ public function place(self $image, int|string $left = 0, int|string $top = 0, int $opacity = 100): static { $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 { $type ??= self::extensionToType(pathinfo($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): void { $this->output($type, $quality); }); } /** * Outputs image to string. */ public function __toString(): string { return $this->toString(); } /** * 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. * @throws Nette\MemberAccessException */ public function __call(string $name, array $args): mixed { $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 ? $this->setImageResource($res) : $res; } public function __clone() { ob_start(function () {}); imagepng($this->image, null, 0); $this->setImageResource(imagecreatefromstring(ob_get_clean())); } private static function isPercent(int|string &$num): bool { if (is_string($num) && str_ends_with($num, '%')) { $num = (float) substr($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.'); } }