Gd::tryToMakeTrueColorIfNot() - Code Metrics - Inspection of "Suppress "Call to an undefined method Gmagick::get..." - rosell-dk/webp-convert - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 77b4d2...47232b )

by Bjørn

created 2020-02-02 19:29 UTC

Gd::tryToMakeTrueColorIfNot() A

↳ Parent: Gd

Complexity

Conditions	5
Paths	9

Size

Total Lines	22
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	30

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	5
eloc	17
c	1
b	0
f	0
nc	9
nop	1
dl	0
loc	22
ccs	0
cts	15
cp	0
crap	30
rs	9.3888

<?php

namespace WebPConvert\Convert\Converters;

use WebPConvert\Convert\Converters\AbstractConverter;
use WebPConvert\Convert\Exceptions\ConversionFailed\ConverterNotOperational\SystemRequirementsNotMetException;
use WebPConvert\Convert\Exceptions\ConversionFailed\InvalidInputException;
use WebPConvert\Convert\Exceptions\ConversionFailedException;

/**
 * Convert images to webp using gd extension.
 *
 * @package    WebPConvert
 * @author     Bjørn Rosell <[email protected]>
 * @since      Class available since Release 2.0.0
 */
class Gd extends AbstractConverter
{
    public function supportsLossless()
    {
        return false;
    }

    protected function getUnsupportedDefaultOptions()
    {
        return [
            'alpha-quality',
            'auto-filter',
            'encoding',
            'low-memory',
            'metadata',
            'method',
            'near-lossless',
            'preset',
            'size-in-percentage',
            'use-nice'
        ];
    }

    private $errorMessageWhileCreating = '';
    private $errorNumberWhileCreating;

    /**
     * Check (general) operationality of Gd converter.
     *
     * @throws SystemRequirementsNotMetException  if system requirements are not met
     */
    public function checkOperationality()
    {
        if (!extension_loaded('gd')) {
            throw new SystemRequirementsNotMetException('Required Gd extension is not available.');
        }

        if (!function_exists('imagewebp')) {
            throw new SystemRequirementsNotMetException(
                'Gd has been compiled without webp support.'
            );
        }
    }

    /**
     * Check if specific file is convertable with current converter / converter settings.
     *
     * @throws SystemRequirementsNotMetException  if Gd has been compiled without support for image type
     */
    public function checkConvertability()
    {
        $mimeType = $this->getMimeTypeOfSource();
        switch ($mimeType) {
            case 'image/png':
                if (!function_exists('imagecreatefrompng')) {
                    throw new SystemRequirementsNotMetException(
                        'Gd has been compiled without PNG support and can therefore not convert this PNG image.'
                    );
                }
                break;

            case 'image/jpeg':
                if (!function_exists('imagecreatefromjpeg')) {
                    throw new SystemRequirementsNotMetException(
                        'Gd has been compiled without Jpeg support and can therefore not convert this jpeg image.'
                    );
                }
        }
    }

    /**
     * Find out if all functions exists.
     *
     * @return boolean
     */
    private static function functionsExist($functionNamesArr)
    {
        foreach ($functionNamesArr as $functionName) {
            if (!function_exists($functionName)) {
                return false;
            }
        }
        return true;
    }

    /**
     * Try to convert image pallette to true color on older systems that does not have imagepalettetotruecolor().
     *
     * The aim is to function as imagepalettetotruecolor, but for older systems.
     * So, if the image is already rgb, nothing will be done, and true will be returned
     * PS: Got the workaround here: https://secure.php.net/manual/en/function.imagepalettetotruecolor.php
     *
     * @param  resource  $image
     * @return boolean  TRUE if the convertion was complete, or if the source image already is a true color image,
     *          otherwise FALSE is returned.
     */
    private function makeTrueColorUsingWorkaround(&$image)
    {
        //return $this->makeTrueColor($image);
        /*
        if (function_exists('imageistruecolor') && imageistruecolor($image)) {
            return true;
        }*/
        if (self::functionsExist(['imagecreatetruecolor', 'imagealphablending', 'imagecolorallocatealpha',
                'imagefilledrectangle', 'imagecopy', 'imagedestroy', 'imagesx', 'imagesy'])) {
            $dst = imagecreatetruecolor(imagesx($image), imagesy($image));

            if ($dst === false) {
                return false;
            }

            //prevent blending with default black
            if (imagealphablending($dst, false) === false) {
                return false;
            }

             //change the RGB values if you need, but leave alpha at 127
            $transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);

            if ($transparent === false) {
                return false;
            }

             //simpler than flood fill
            if (imagefilledrectangle($dst, 0, 0, imagesx($image), imagesy($image), $transparent) === false) {
                return false;
            }

            //restore default blending
            if (imagealphablending($dst, true) === false) {
                return false;
            };

            if (imagecopy($dst, $image, 0, 0, 0, 0, imagesx($image), imagesy($image)) === false) {
                return false;
            }
            imagedestroy($image);

            $image = $dst;
            return true;
        } else {
            // The necessary methods for converting color palette are not avalaible
            return false;
        }
    }

    /**
     * Try to convert image pallette to true color.
     *
     * Try to convert image pallette to true color. If imagepalettetotruecolor() exists, that is used (available from
     * PHP >= 5.5.0). Otherwise using workaround found on the net.
     *
     * @param  resource  $image
     * @return boolean  TRUE if the convertion was complete, or if the source image already is a true color image,
     *          otherwise FALSE is returned.
     */
    private function makeTrueColor(&$image)
    {
        if (function_exists('imagepalettetotruecolor')) {
            return imagepalettetotruecolor($image);
        } else {
            // imagepalettetotruecolor() is not available on this system. Using custom implementation instead
            return $this->makeTrueColorUsingWorkaround($image);
        }
    }

    /**
     * Create Gd image resource from source
     *
     * @throws  InvalidInputException  if mime type is unsupported or could not be detected
     * @throws  ConversionFailedException  if imagecreatefrompng or imagecreatefromjpeg fails
     * @return  resource  $image  The created image
     */
    private function createImageResource()
    {
        $mimeType = $this->getMimeTypeOfSource();

        switch ($mimeType) {
            case 'image/png':
                $image = imagecreatefrompng($this->source);
                if ($image === false) {
                    throw new ConversionFailedException(
                        'Gd failed when trying to load/create image (imagecreatefrompng() failed)'
                    );
                }
                return $image;

            case 'image/jpeg':
                $image = imagecreatefromjpeg($this->source);
                if ($image === false) {
                    throw new ConversionFailedException(
                        'Gd failed when trying to load/create image (imagecreatefromjpeg() failed)'
                    );
                }
                return $image;
        }

        throw new InvalidInputException('Unsupported mime type');
    }

    /**
     * Try to make image resource true color if it is not already.
     *
     * @param  resource  $image  The image to work on
     * @return void
     */
    protected function tryToMakeTrueColorIfNot(&$image)
    {
        $mustMakeTrueColor = false;
        if (function_exists('imageistruecolor')) {
            if (imageistruecolor($image)) {
                $this->logLn('image is true color');
            } else {
                $this->logLn('image is not true color');
                $mustMakeTrueColor = true;
            }
        } else {
            $this->logLn('It can not be determined if image is true color');
            $mustMakeTrueColor = true;
        }

        if ($mustMakeTrueColor) {
            $this->logLn('converting color palette to true color');
            $success = $this->makeTrueColor($image);
            if (!$success) {
                $this->logLn(
                    'Warning: FAILED converting color palette to true color. ' .
                    'Continuing, but this does NOT look good.'
                );
            }
        }
    }

    /**
     *
     * @param  resource  $image
     * @return boolean  true if alpha blending was set successfully, false otherwise
     */
    protected function trySettingAlphaBlending($image)
    {
        if (function_exists('imagealphablending')) {
            // TODO: Should we set second parameter to false instead?
            // As here: https://www.texelate.co.uk/blog/retaining-png-transparency-with-php-gd
            // (PS: I have backed up some local changes - to Gd.php, which includes changing that param
            // to false. But I didn't finish up back then and now I forgot, so need to retest before
            // changing anything...
            if (!imagealphablending($image, true)) {
                $this->logLn('Warning: imagealphablending() failed');
                return false;
            }
        } else {
            $this->logLn(
                'Warning: imagealphablending() is not available on your system.' .
                ' Converting PNGs with transparency might fail on some systems'
            );
            return false;
        }

        if (function_exists('imagesavealpha')) {
            if (!imagesavealpha($image, true)) {
                $this->logLn('Warning: imagesavealpha() failed');
                return false;
            }
        } else {
            $this->logLn(
                'Warning: imagesavealpha() is not available on your system. ' .
                'Converting PNGs with transparency might fail on some systems'
            );
            return false;
        }
        return true;
    }

    protected function errorHandlerWhileCreatingWebP($errno, $errstr, $errfile, $errline)
    {
        $this->errorNumberWhileCreating = $errno;
        $this->errorMessageWhileCreating = $errstr . ' in ' . $errfile . ', line ' . $errline .
            ', PHP ' . PHP_VERSION . ' (' . PHP_OS . ')';
        //return false;
    }

    /**
     *
     * @param  resource  $image
     * @return void
     */
    protected function destroyAndRemove($image)
    {
        imagedestroy($image);
        if (file_exists($this->destination)) {
            unlink($this->destination);
        }
    }

    /**
     *
     * @param  resource  $image
     * @return void
     */
    protected function tryConverting($image)
    {

        // Danger zone!
        //    Using output buffering to generate image.
        //    In this zone, Do NOT do anything that might produce unwanted output
        //    Do NOT call $this->logLn
        // --------------------------------- (start of danger zone)

        $addedZeroPadding = false;
        set_error_handler(array($this, "errorHandlerWhileCreatingWebP"));

        // This line may trigger log, so we need to do it BEFORE ob_start() !
        $q = $this->getCalculatedQuality();

        ob_start();

        //$success = imagewebp($image, $this->destination, $q);
        $success = imagewebp($image, null, $q);

        if (!$success) {
            $this->destroyAndRemove($image);
            ob_end_clean();
            restore_error_handler();
            throw new ConversionFailedException(
                'Failed creating image. Call to imagewebp() failed.',
                $this->errorMessageWhileCreating
            );
        }


        // The following hack solves an `imagewebp` bug
        // See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files
        if (ob_get_length() % 2 == 1) {
            echo "\0";
            $addedZeroPadding = true;
        }
        $output = ob_get_clean();
        restore_error_handler();

        if ($output == '') {
            $this->destroyAndRemove($image);
            throw new ConversionFailedException(
                'Gd failed: imagewebp() returned empty string'
            );
        }

        // --------------------------------- (end of danger zone).


        if ($this->errorMessageWhileCreating != '') {
            switch ($this->errorNumberWhileCreating) {
                case E_WARNING:
                    $this->logLn('An warning was produced during conversion: ' . $this->errorMessageWhileCreating);
                    break;
                case E_NOTICE:
                    $this->logLn('An notice was produced during conversion: ' . $this->errorMessageWhileCreating);
                    break;
                default:
                    $this->destroyAndRemove($image);
                    throw new ConversionFailedException(
                        'An error was produced during conversion',
                        $this->errorMessageWhileCreating
                    );
                    //break;
            }
        }

        if ($addedZeroPadding) {
            $this->logLn(
                'Fixing corrupt webp by adding a zero byte ' .
                '(older versions of Gd had a bug, but this hack fixes it)'
            );
        }

        $success = file_put_contents($this->destination, $output);

        if (!$success) {
            $this->destroyAndRemove($image);
            throw new ConversionFailedException(
                'Gd failed when trying to save the image. Check file permissions!'
            );
        }

        /*
        Previous code was much simpler, but on a system, the hack was not activated (a file with uneven number of bytes
        was created). This is puzzeling. And the old code did not provide any insights.
        Also, perhaps having two subsequent writes to the same file could perhaps cause a problem.
        In the new code, there is only one write.
        However, a bad thing about the new code is that the entire webp file is read into memory. This might cause
        memory overflow with big files.
        Perhaps we should check the filesize of the original and only use the new code when it is smaller than
        memory limit set in PHP by a certain factor.
        Or perhaps only use the new code on older versions of Gd
        https://wordpress.org/support/topic/images-not-seen-on-chrome/#post-11390284

        Here is the old code:

        $success = imagewebp($image, $this->destination, $this->getCalculatedQuality());

        if (!$success) {
            throw new ConversionFailedException(
                'Gd failed when trying to save the image as webp (call to imagewebp() failed). ' .
                'It probably failed writing file. Check file permissions!'
            );
        }


        // This hack solves an `imagewebp` bug
        // See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files
        if (filesize($this->destination) % 2 == 1) {
            file_put_contents($this->destination, "\0", FILE_APPEND);
        }
        */
    }

    // Although this method is public, do not call directly.
    // You should rather call the static convert() function, defined in AbstractConverter, which
    // takes care of preparing stuff before calling doConvert, and validating after.
    protected function doActualConvert()
    {

        $this->logLn('GD Version: ' . gd_info()["GD Version"]);

        // Btw: Check out processWebp here:
        // https://github.com/Intervention/image/blob/master/src/Intervention/Image/Gd/Encoder.php

        // Create image resource
        $image = $this->createImageResource();

        // Try to convert color palette if it is not true color
        $this->tryToMakeTrueColorIfNot($image);


        if ($this->getMimeTypeOfSource() == 'image/png') {
            // Try to set alpha blending
            $this->trySettingAlphaBlending($image);
        }

        // Try to convert it to webp
        $this->tryConverting($image);

        // End of story
        imagedestroy($image);
    }
}


1		<?php
2
3		namespace WebPConvert\Convert\Converters;
4
5		use WebPConvert\Convert\Converters\AbstractConverter;
6		use WebPConvert\Convert\Exceptions\ConversionFailed\ConverterNotOperational\SystemRequirementsNotMetException;
7		use WebPConvert\Convert\Exceptions\ConversionFailed\InvalidInputException;
8		use WebPConvert\Convert\Exceptions\ConversionFailedException;
9
10		/**
11		* Convert images to webp using gd extension.
12		*
13		* @package WebPConvert
14		* @author Bjørn Rosell <[email protected]>
15		* @since Class available since Release 2.0.0
16		*/
17		class Gd extends AbstractConverter
18		{
19		public function supportsLossless()
20		{
21		return false;
22		}
23
24		protected function getUnsupportedDefaultOptions()
25		{
26		return [
27		'alpha-quality',
28		'auto-filter',
29		'encoding',
30		'low-memory',
31		'metadata',
32		'method',
33		'near-lossless',
34		'preset',
35		'size-in-percentage',
36		'use-nice'
37		];
38		}
39
40		private $errorMessageWhileCreating = '';
41		private $errorNumberWhileCreating;
42
43		/**
44		* Check (general) operationality of Gd converter.
45		*
46		* @throws SystemRequirementsNotMetException if system requirements are not met
47		*/
48	5	public function checkOperationality()
49		{
50	5	if (!extension_loaded('gd')) {
51	1	throw new SystemRequirementsNotMetException('Required Gd extension is not available.');
52		}
53
54	4	if (!function_exists('imagewebp')) {
55	4	throw new SystemRequirementsNotMetException(
56	4	'Gd has been compiled without webp support.'
57		);
58		}
59		}
60
61		/**
62		* Check if specific file is convertable with current converter / converter settings.
63		*
64		* @throws SystemRequirementsNotMetException if Gd has been compiled without support for image type
65		*/
66	3	public function checkConvertability()
67		{
68	3	$mimeType = $this->getMimeTypeOfSource();
69		switch ($mimeType) {
70	3	case 'image/png':
71	2	if (!function_exists('imagecreatefrompng')) {
72	1	throw new SystemRequirementsNotMetException(
73	1	'Gd has been compiled without PNG support and can therefore not convert this PNG image.'
74		);
75		}
76	1	break;
77
78	1	case 'image/jpeg':
79	1	if (!function_exists('imagecreatefromjpeg')) {
80	1	throw new SystemRequirementsNotMetException(
81	1	'Gd has been compiled without Jpeg support and can therefore not convert this jpeg image.'
82		);
83		}
84		}
85	1	}
86
87		/**
88		* Find out if all functions exists.
89		*
90		* @return boolean
91		*/
92		private static function functionsExist($functionNamesArr)
93		{
94		foreach ($functionNamesArr as $functionName) {
95		if (!function_exists($functionName)) {
96		return false;
97		}
98		}
99		return true;
100		}
101
102		/**
103		* Try to convert image pallette to true color on older systems that does not have imagepalettetotruecolor().
104		*
105		* The aim is to function as imagepalettetotruecolor, but for older systems.
106		* So, if the image is already rgb, nothing will be done, and true will be returned
107		* PS: Got the workaround here: https://secure.php.net/manual/en/function.imagepalettetotruecolor.php
108		*
109		* @param resource $image
110		* @return boolean TRUE if the convertion was complete, or if the source image already is a true color image,
111		* otherwise FALSE is returned.
112		*/
113		private function makeTrueColorUsingWorkaround(&$image)
114		{
115		//return $this->makeTrueColor($image);
116		/*
117		if (function_exists('imageistruecolor') && imageistruecolor($image)) {
118		return true;
119		}*/
120		if (self::functionsExist(['imagecreatetruecolor', 'imagealphablending', 'imagecolorallocatealpha',
121		'imagefilledrectangle', 'imagecopy', 'imagedestroy', 'imagesx', 'imagesy'])) {
122		$dst = imagecreatetruecolor(imagesx($image), imagesy($image));
123
124		if ($dst === false) {
125		return false;
126		}
127
128		//prevent blending with default black
129		if (imagealphablending($dst, false) === false) {
130		return false;
131		}
132
133		//change the RGB values if you need, but leave alpha at 127
134		$transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);
135
136		if ($transparent === false) {
137		return false;
138		}
139
140		//simpler than flood fill
141		if (imagefilledrectangle($dst, 0, 0, imagesx($image), imagesy($image), $transparent) === false) {
142		return false;
143		}
144
145		//restore default blending
146		if (imagealphablending($dst, true) === false) {
147		return false;
148		};
149
150		if (imagecopy($dst, $image, 0, 0, 0, 0, imagesx($image), imagesy($image)) === false) {
151		return false;
152		}
153		imagedestroy($image);
154
155		$image = $dst;
156		return true;
157		} else {
158		// The necessary methods for converting color palette are not avalaible
159		return false;
160		}
161		}
162
163		/**
164		* Try to convert image pallette to true color.
165		*
166		* Try to convert image pallette to true color. If imagepalettetotruecolor() exists, that is used (available from
167		* PHP >= 5.5.0). Otherwise using workaround found on the net.
168		*
169		* @param resource $image
170		* @return boolean TRUE if the convertion was complete, or if the source image already is a true color image,
171		* otherwise FALSE is returned.
172		*/
173		private function makeTrueColor(&$image)
174		{
175		if (function_exists('imagepalettetotruecolor')) {
176		return imagepalettetotruecolor($image);
177		} else {
178		// imagepalettetotruecolor() is not available on this system. Using custom implementation instead
179		return $this->makeTrueColorUsingWorkaround($image);
180		}
181		}
182
183		/**
184		* Create Gd image resource from source
185		*
186		* @throws InvalidInputException if mime type is unsupported or could not be detected
187		* @throws ConversionFailedException if imagecreatefrompng or imagecreatefromjpeg fails
188		* @return resource $image The created image
189		*/
190		private function createImageResource()
191		{
192		$mimeType = $this->getMimeTypeOfSource();
193
194		switch ($mimeType) {
195		case 'image/png':
196		$image = imagecreatefrompng($this->source);
197		if ($image === false) {
198		throw new ConversionFailedException(
199		'Gd failed when trying to load/create image (imagecreatefrompng() failed)'
200		);
201		}
202		return $image;
203
204		case 'image/jpeg':
205		$image = imagecreatefromjpeg($this->source);
206		if ($image === false) {
207		throw new ConversionFailedException(
208		'Gd failed when trying to load/create image (imagecreatefromjpeg() failed)'
209		);
210		}
211		return $image;
212		}
213
214		throw new InvalidInputException('Unsupported mime type');
215		}
216
217		/**
218		* Try to make image resource true color if it is not already.
219		*
220		* @param resource $image The image to work on
221		* @return void
222		*/
223		protected function tryToMakeTrueColorIfNot(&$image)
224		{
225		$mustMakeTrueColor = false;
226		if (function_exists('imageistruecolor')) {
227		if (imageistruecolor($image)) {
228		$this->logLn('image is true color');
229		} else {
230		$this->logLn('image is not true color');
231		$mustMakeTrueColor = true;
232		}
233		} else {
234		$this->logLn('It can not be determined if image is true color');
235		$mustMakeTrueColor = true;
236		}
237
238		if ($mustMakeTrueColor) {
239		$this->logLn('converting color palette to true color');
240		$success = $this->makeTrueColor($image);
241		if (!$success) {
242		$this->logLn(
243		'Warning: FAILED converting color palette to true color. ' .
244		'Continuing, but this does NOT look good.'
245		);
246		}
247		}
248		}
249
250		/**
251		*
252		* @param resource $image
253		* @return boolean true if alpha blending was set successfully, false otherwise
254		*/
255		protected function trySettingAlphaBlending($image)
256		{
257		if (function_exists('imagealphablending')) {
258		// TODO: Should we set second parameter to false instead?
259		// As here: https://www.texelate.co.uk/blog/retaining-png-transparency-with-php-gd
260		// (PS: I have backed up some local changes - to Gd.php, which includes changing that param
261		// to false. But I didn't finish up back then and now I forgot, so need to retest before
262		// changing anything...
263		if (!imagealphablending($image, true)) {
264		$this->logLn('Warning: imagealphablending() failed');
265		return false;
266		}
267		} else {
268		$this->logLn(
269		'Warning: imagealphablending() is not available on your system.' .
270		' Converting PNGs with transparency might fail on some systems'
271		);
272		return false;
273		}
274
275		if (function_exists('imagesavealpha')) {
276		if (!imagesavealpha($image, true)) {
277		$this->logLn('Warning: imagesavealpha() failed');
278		return false;
279		}
280		} else {
281		$this->logLn(
282		'Warning: imagesavealpha() is not available on your system. ' .
283		'Converting PNGs with transparency might fail on some systems'
284		);
285		return false;
286		}
287		return true;
288		}
289
290		protected function errorHandlerWhileCreatingWebP($errno, $errstr, $errfile, $errline)
291		{
292		$this->errorNumberWhileCreating = $errno;
293		$this->errorMessageWhileCreating = $errstr . ' in ' . $errfile . ', line ' . $errline .
294		', PHP ' . PHP_VERSION . ' (' . PHP_OS . ')';
295		//return false;
296		}
297
298		/**
299		*
300		* @param resource $image
301		* @return void
302		*/
303		protected function destroyAndRemove($image)
304		{
305		imagedestroy($image);
306		if (file_exists($this->destination)) {
307		unlink($this->destination);
308		}
309		}
310
311		/**
312		*
313		* @param resource $image
314		* @return void
315		*/
316		protected function tryConverting($image)
317		{
318
319		// Danger zone!
320		// Using output buffering to generate image.
321		// In this zone, Do NOT do anything that might produce unwanted output
322		// Do NOT call $this->logLn
323		// --------------------------------- (start of danger zone)
324
325		$addedZeroPadding = false;
326		set_error_handler(array($this, "errorHandlerWhileCreatingWebP"));
327
328		// This line may trigger log, so we need to do it BEFORE ob_start() !
329		$q = $this->getCalculatedQuality();
330
331		ob_start();
332
333		//$success = imagewebp($image, $this->destination, $q);
334		$success = imagewebp($image, null, $q);
335
336		if (!$success) {
337		$this->destroyAndRemove($image);
338		ob_end_clean();
339		restore_error_handler();
340		throw new ConversionFailedException(
341		'Failed creating image. Call to imagewebp() failed.',
342		$this->errorMessageWhileCreating
343		);
344		}
345
346
347		// The following hack solves an `imagewebp` bug
348		// See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files
349		if (ob_get_length() % 2 == 1) {
350		echo "\0";
351		$addedZeroPadding = true;
352		}
353		$output = ob_get_clean();
354		restore_error_handler();
355
356		if ($output == '') {
357		$this->destroyAndRemove($image);
358		throw new ConversionFailedException(
359		'Gd failed: imagewebp() returned empty string'
360		);
361		}
362
363		// --------------------------------- (end of danger zone).
364
365
366		if ($this->errorMessageWhileCreating != '') {
367		switch ($this->errorNumberWhileCreating) {
368		case E_WARNING:
369		$this->logLn('An warning was produced during conversion: ' . $this->errorMessageWhileCreating);
370		break;
371		case E_NOTICE:
372		$this->logLn('An notice was produced during conversion: ' . $this->errorMessageWhileCreating);
373		break;
374		default:
375		$this->destroyAndRemove($image);
376		throw new ConversionFailedException(
377		'An error was produced during conversion',
378		$this->errorMessageWhileCreating
379		);
380		//break;
381		}
382		}
383
384		if ($addedZeroPadding) {
385		$this->logLn(
386		'Fixing corrupt webp by adding a zero byte ' .
387		'(older versions of Gd had a bug, but this hack fixes it)'
388		);
389		}
390
391		$success = file_put_contents($this->destination, $output);
392
393		if (!$success) {
394		$this->destroyAndRemove($image);
395		throw new ConversionFailedException(
396		'Gd failed when trying to save the image. Check file permissions!'
397		);
398		}
399
400		/*
401		Previous code was much simpler, but on a system, the hack was not activated (a file with uneven number of bytes
402		was created). This is puzzeling. And the old code did not provide any insights.
403		Also, perhaps having two subsequent writes to the same file could perhaps cause a problem.
404		In the new code, there is only one write.
405		However, a bad thing about the new code is that the entire webp file is read into memory. This might cause
406		memory overflow with big files.
407		Perhaps we should check the filesize of the original and only use the new code when it is smaller than
408		memory limit set in PHP by a certain factor.
409		Or perhaps only use the new code on older versions of Gd
410		https://wordpress.org/support/topic/images-not-seen-on-chrome/#post-11390284
411
412		Here is the old code:
413
414		$success = imagewebp($image, $this->destination, $this->getCalculatedQuality());
415
416		if (!$success) {
417		throw new ConversionFailedException(
418		'Gd failed when trying to save the image as webp (call to imagewebp() failed). ' .
419		'It probably failed writing file. Check file permissions!'
420		);
421		}
422
423
424		// This hack solves an `imagewebp` bug
425		// See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files
426		if (filesize($this->destination) % 2 == 1) {
427		file_put_contents($this->destination, "\0", FILE_APPEND);
428		}
429		*/
430		}
431
432		// Although this method is public, do not call directly.
433		// You should rather call the static convert() function, defined in AbstractConverter, which
434		// takes care of preparing stuff before calling doConvert, and validating after.
435		protected function doActualConvert()
436		{
437
438		$this->logLn('GD Version: ' . gd_info()["GD Version"]);
439
440		// Btw: Check out processWebp here:
441		// https://github.com/Intervention/image/blob/master/src/Intervention/Image/Gd/Encoder.php
442
443		// Create image resource
444		$image = $this->createImageResource();
445
446		// Try to convert color palette if it is not true color
447		$this->tryToMakeTrueColorIfNot($image);
448
449
450		if ($this->getMimeTypeOfSource() == 'image/png') {
451		// Try to set alpha blending
452		$this->trySettingAlphaBlending($image);
453		}
454
455		// Try to convert it to webp
456		$this->tryConverting($image);
457
458		// End of story
459		imagedestroy($image);
460		}
461		}
462

rosell-dk / webp-convert

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