Added support for multiple image processing drivers

README.md

@@ -8,7 +8,7 @@
 ![Downloads](https://img.shields.io/packagist/dt/geckon01/simple-image-compressor)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/d773335a657d467faaa0ebb12bc2abe1)](https://app.codacy.com/gh/Geckon01/simple-image-compressor/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade)
 
-**SimpleImageCompressor** - is a tiny simple PHP image resizer/compressor lib which allows you to resize and compress any image easily on the fly.
+**SimpleImageCompressor** - is a tiny simple PHP image resizer lib which allows you to resize and compress any image easily on the fly.
 
 ## Installation
 
@@ -19,9 +19,9 @@ composer require "geckon01/simple-image-compressor"
 
 ### Without composer
 
- 1.  Download latest release [here](https://github.com/Geckon01/simple-image-compressor/releases).
- 2. Unpack archive to any folder of your project you wish.
- 3. Load main lib files:
+ 1. Download latest release [here](https://github.com/Geckon01/simple-image-compressor/releases).
+ 2. Unpack the archive to your project directory.
+ 3. Include the library files:
 
 ```php
 require "src/SimpleImageCompressor.php";  
@@ -31,7 +31,7 @@ use geckon01\SimpleImageCompressor\SimpleImageCompressor;
 
 ## Usage
 
-To resize and compress your image you can use next code:
+Resize and compress an image:
 ```php
 $resolutionTargetPercent = 50;
 $targetQuality = 50;
@@ -43,14 +43,13 @@ load method supports loading from local file, or you can specify any valid URL i
 ```php
 $compressor = SimpleImageCompressor::load("https://example.com/image.jpg");
 ```
-This lib support chaining, so you can do something like this:
+Method chaining is supported:
 ```php
 SimpleImageCompressor::load("image.png")
 	->resizeAndCompress(50, 50)
 	->toFile("image");
 ```
-> Note that you don't need to specify file extension. The lib will save
-> file with proper one automatically. 
+> Note: File extensions are automatically added. Use toFile("filename") without extension.
 
 ### Output format
 You can specify output format. Supported output fomats are:
@@ -64,14 +63,14 @@ $compressedImage->toBase64();
 ```php 
 $compressedImage->toGdImage();
 ```
-### Max/min height/width
-Also you can set approximate minumum and maximum image size. 
+### Size Constraints
+Set approximate minimum dimensions (aspect ratio preserved): 
 ```php 
 $compressor->setApproxMinimumHeight(500);  
 $compressor->setApproxMinimumWidth(500);
 ```
-> Note that Due to saving proportion lib can't guarantee that width and height be equals max and min . 
-As example, if we have original image 1920x1080 which we want to get 50% of original resolution  and save original 16x9 aspect ration the reduced image must be 960x540.
+> Note actual dimensions may differ due to aspect ratio preservation.
+Example: 1920×1080 image reduced to 50% becomes 960×540 (maintaining 16:9).
 
 ## License
 

src/SimpleImageCompressor.php

@@ -9,6 +9,9 @@
 namespace geckon01\SimpleImageCompressor;
 
 
+use geckon01\SimpleImageCompressor\Drivers\DriverInterface;
+use geckon01\SimpleImageCompressor\Drivers\GdDriver;
+
 /**
  * Class SimpleImageCompressor
  * @package geckon01\SimpleImageCompressor
@@ -17,7 +20,6 @@ class SimpleImageCompressor
 {
     private const ALLOWED_IMAGE_FORMAT = "image/jpeg,image/png,image/gif,image/webp,image/bmp";
     private string $imageResourceUrl;
-    private string $imageData;
     private string $imageType;
 
     private int $approxMinimumHeight = 90;
@@ -25,17 +27,25 @@ class SimpleImageCompressor
 
     private bool $exifLoaded = false;
 
+    private ?DriverInterface $driver;
 
     /**
      * SimpleImageCompressor constructor.
-     * @param $url url or path from where to load file
+     * @param $url string url or path from where to load file
+     * @param DriverInterface|null $driver
      */
-    private function __construct($url)
+    private function __construct(string $url, ?DriverInterface $driver = null)
     {
         $this->imageResourceUrl = $url;
         $this->exifLoaded = in_array("exif", get_loaded_extensions());
-    }
+        if($driver == null)
+        {
+            $this->driver = new GdDriver();
+        } else {
+            $this->driver = $driver;
+        }
 
+    }
 
     /**
      * Returns current loaded image type
@@ -83,7 +93,7 @@ class SimpleImageCompressor
     /**
      * Determine current loaded image type
      */
-    private function loadImageType() {
+    private function loadImageType(string $imageBinary) {
         $this->imageType = "image";
 
         if($this->exifLoaded) {
@@ -116,77 +126,43 @@ class SimpleImageCompressor
         // Fallback to bytes recognition
         trigger_error("simple-image-compressor: Exif extension not found. Image MIME type recognition may be inaccurate.");
 
-        if (substr($this->imageData, 0, 2) === "\xFF\xD8") {
+        if (substr($imageBinary, 0, 2) === "\xFF\xD8") {
             $this->imageType = 'image/jpeg';
         }
-        if (substr($this->imageData, 0, 3) === "\x89\x50\x4E") {
+        if (substr($imageBinary, 0, 3) === "\x89\x50\x4E") {
             $this->imageType = 'image/png';
         }
-        if (substr($this->imageData, 0, 4) === "\x47\x49\x46\x38") {
+        if (substr($imageBinary, 0, 4) === "\x47\x49\x46\x38") {
             $this->imageType = 'image/gif';
         }
     }
 
-    /**
-     * Loading image from provided url. Whether it local file or internet resource
-     */
-    private function readImageToString(): void {
-        $imageData = file_get_contents($this->imageResourceUrl);
-
-        if($imageData === false)
-            throw new \Exception("Cannot load image from provided resource: ".$this->imageResourceUrl);
-
-        $this->imageData = $imageData;
-    }
-
     /**
      * Resizes and compressing image.
      * Note that gif compression not supported
      * @param int $reductionPercent percent shows how much image resolution to original will be. The greater percent, the lower resolution
      * @param int $quality
      * @return CompressedImage
+     * @throws \Exception
      */
     public function resizeAndCompress($reductionPercent = 5, $quality = 90): CompressedImage
     {
-        $originImage = imagecreatefromstring($this->imageData);
-
-        if($originImage === false)
-            throw new \Exception("Can not read provided file");
-
-        $width = imagesx($originImage);
-        $height = imagesy($originImage);
-
-        $totalPixelCount = $width * $height;
-        $minimumPixelCount = $this->approxMinimumWidth * $this->approxMinimumHeight;
-        $maxReductionPercent = round(abs(100 - ($minimumPixelCount / $totalPixelCount * 100)));
-
-        // Due to saving proportion we can't guarantee that width and height be equals max and min
-        // As example, if we have original image 1920*1080 which we want to get 50% of original resolution
-        // If we want to save 16*9 aspect ration it must be 960*540
-        // So, we override $maxReductionPercent to value which satisfy origin aspect ratio
-        if($maxReductionPercent < $reductionPercent)
-            $reductionPercent = $maxReductionPercent;
-
-        $newWidth = round($width - ($width * $reductionPercent) / 100);
-        $newHeight = round($height - ($height * $reductionPercent) / 100);
-
-        $thumb = imagecreatetruecolor($newWidth, $newHeight);
-        imagecopyresized($thumb, $originImage, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
-
-        return new CompressedImage($quality, $this->imageType,$thumb);
+        return $this->driver
+            ->resize($reductionPercent, $quality, $this->approxMinimumWidth, $this->approxMinimumHeight, $this->imageType);
     }
 
     /**
      * Initalize lib from provided image file path
      * @param string $urlImageResource image resource path. Can be local file or internet URL
+     * @param DriverInterface|null $driver
      * @return SimpleImageCompressor
      * @throws \Exception
      */
-    public static function load(string $urlImageResource): SimpleImageCompressor
+    public static function load(string $urlImageResource, ?DriverInterface $driver = null): SimpleImageCompressor
     {
-        $compressorObject = new SimpleImageCompressor($urlImageResource);
-        $compressorObject->readImageToString();
-        $compressorObject->loadImageType();
+        $compressorObject = new SimpleImageCompressor($urlImageResource, $driver);
+        $compressorObject->driver->load($urlImageResource);
+        $compressorObject->loadImageType($compressorObject->driver->getImageBinary());
 
         if(!str_contains(self::ALLOWED_IMAGE_FORMAT, $compressorObject->getImageType())
             || $compressorObject->getImageType() === "")

src/drivers/DriverInterface.php

@@ -0,0 +1,14 @@
+<?php
+
+
+namespace geckon01\SimpleImageCompressor\Drivers;
+
+use geckon01\SimpleImageCompressor\CompressedImage;
+use geckon01\SimpleImageCompressor\SimpleImageCompressor;
+
+interface DriverInterface
+{
+    function resize(int $reductionPercent, int $quality, int $approxMinimumWidth, int $approxMinimumHeight, string $imageType): CompressedImage;
+    function load(string $path): DriverInterface;
+    function getImageBinary(): string;
+}

src/drivers/GdDriver.php

@@ -0,0 +1,60 @@
+<?php
+
+
+namespace geckon01\SimpleImageCompressor\Drivers;
+
+
+use geckon01\SimpleImageCompressor\CompressedImage;
+
+class GdDriver implements DriverInterface
+{
+    private string $imageData;
+
+    function resize(int $reductionPercent, int $quality, int $approxMinimumWidth, int $approxMinimumHeight, string $imageType): CompressedImage
+    {
+        $originImage = imagecreatefromstring($this->imageData);
+
+        if($originImage === false)
+            throw new \Exception("Can not read provided file");
+
+        $width = imagesx($originImage);
+        $height = imagesy($originImage);
+
+        $totalPixelCount = $width * $height;
+        $minimumPixelCount = $approxMinimumWidth * $approxMinimumHeight;
+        $maxReductionPercent = round(abs(100 - ($minimumPixelCount / $totalPixelCount * 100)));
+
+        // Due to saving proportion we can't guarantee that width and height be equals max and min
+        // As example, if we have original image 1920*1080 which we want to get 50% of original resolution
+        // If we want to save 16*9 aspect ration it must be 960*540
+        // So, we override $maxReductionPercent to value which satisfy origin aspect ratio
+        if($maxReductionPercent < $reductionPercent)
+            $reductionPercent = $maxReductionPercent;
+
+        $newWidth = round($width - ($width * $reductionPercent) / 100);
+        $newHeight = round($height - ($height * $reductionPercent) / 100);
+
+        $thumb = imagecreatetruecolor($newWidth, $newHeight);
+        imagecopyresized($thumb, $originImage, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
+
+        return new CompressedImage($quality, $imageType, $thumb);
+    }
+
+    function load(string $path): DriverInterface
+    {
+        $this->imageData = file_get_contents($path);
+
+        if($this->imageData === false)
+            throw new \Exception("Cannot load image from provided resource: ".$path);
+
+        return $this;
+    }
+
+    function getImageBinary(): string
+    {
+        if($this->imageData == null)
+            throw new \Exception("Load image before getting its binary.");
+
+        return $this->imageData;
+    }
+}