recreate project

vendor/mike42/gfx-php/test/unit/IndexedRasterImageTest.php

@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * Many of these tests use an example image like this-
+ *╭────╮
+ *│░░▒▒│   ░░ = 0   ▓▓ = 2
+ *│▓▓██│   ▒▒ = 1   ██ = 3
+ *╰────╯   
+ */
+use PHPUnit\Framework\TestCase;
+use Mike42\GfxPhp\Image;
+use Mike42\GfxPhp\IndexedRasterImage;
+use Mike42\GfxPhp\RgbRasterImage;
+
+class IndexedRasterImageTest extends TestCase
+{
+    
+    protected function createIndexedTestImage() {
+        $image = IndexedRasterImage::create(2, 2, null, [
+            [255, 255, 255],
+            [160, 160, 160],
+            [80, 80, 80],
+            [0, 0, 0]]);
+        $image -> setPixel(0, 0, 0);
+        $image -> setPixel(1, 0, 1);
+        $image -> setPixel(0, 1, 2);
+        $image -> setPixel(1, 1, 3);
+        return $image;
+    }
+
+    public function testCreate()
+    {
+        $img = $this -> createIndexedTestImage();
+        $this -> assertEquals(2, $img -> getWidth());
+        $this -> assertEquals(2, $img -> getHeight());
+        $this -> assertEquals(255, $img -> getMaxVal());
+        $this -> assertEquals("▄▄\n", $img -> toBlackAndWhite() -> toString());
+    }
+
+    public function testReduceDepthTo1Bit()
+    {
+        $img = $this -> createIndexedTestImage();
+        $img -> setMaxVal(1);
+        $this -> assertEquals(0, $img -> getPixel(0, 0));
+        $this -> assertEquals(0, $img -> getPixel(1, 0));
+        $this -> assertEquals(1, $img -> getPixel(0, 1));
+        $this -> assertEquals(1, $img -> getPixel(1, 1));
+    }
+
+    public function testToGrayscale() {
+        $img = $this -> createIndexedTestImage() -> toGrayscale();
+        $this -> assertEquals(255, $img -> getPixel(0, 0));
+        $this -> assertEquals(160, $img -> getPixel(1, 0));
+        $this -> assertEquals(80, $img -> getPixel(0, 1));
+        $this -> assertEquals(0, $img -> getPixel(1, 1));
+    }
+
+    public function testToRgb() {
+        $white = RgbRasterImage::rgbToInt(255, 255, 255);
+        $lightGray = RgbRasterImage::rgbToInt(160, 160, 160);
+        $darkGray = RgbRasterImage::rgbToInt(80, 80, 80);
+        $black = RgbRasterImage::rgbToInt(0, 0, 0);
+        $img = $this -> createIndexedTestImage() -> toRgb();
+        $this -> assertEquals($white, $img -> getPixel(0, 0));
+        $this -> assertEquals($lightGray, $img -> getPixel(1, 0));
+        $this -> assertEquals($darkGray, $img -> getPixel(0, 1));
+        $this -> assertEquals($black, $img -> getPixel(1, 1));
+    }
+    
+    public function testRgbToIndexExists() {
+        $img = $this -> createIndexedTestImage();
+        $idx = $img -> rgbToIndex([80, 80, 80]);
+        $this -> assertEquals(2, $idx);
+    }
+    
+    public function testQuantizeGrayscale() {
+        // Produce 8-bit grayscale image via high color-count RGBA
+        $img = Image::fromFile(__DIR__ . "/../resources/pngsuite/basn2c08.png") -> toIndexed() -> toGrayscale();
+        $this -> assertEquals(255, $img -> getMaxVal());
+        $this -> assertEquals(255, $img -> getPixel(0, 0)); // White
+        $this -> assertEquals(0, $img -> getPixel(31, 31)); // Black
+    }
+    
+    public function testQuantizeRgb() {
+        // Reduce depth of image with more than 16 colors.
+        $img = Image::fromFile(__DIR__ . "/../resources/pngsuite/basn2c08.png") -> toIndexed();
+        $this -> assertEquals(16777215, $img -> getMaxVal());
+        $img -> setMaxVal(255);
+        // Check new range.
+        $this -> assertEquals(255, $img -> getMaxVal());
+        $this -> assertEquals(255, $img -> getPixel(0, 0)); // White
+        $this -> assertEquals(0, $img -> getPixel(31, 31)); // Black
+    }
+}
+