function ToolkitGdTest::testManipulations

Tests height, width and color for the corners for the final images.

Since PHP can't visually check that our images have been manipulated properly, build a list of expected color values for each of the corners and the expected height and widths for the final images.

@dataProvider providerTestImageFiles

File

core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php, line 287

Class

ToolkitGdTest

Tests for the GD image toolkit.

Namespace

Code

public function testManipulations(string $file_name, string $test_case, string $operation, array $arguments, array $expected) : void {
    // Load up a fresh image.
    $image = $this->imageFactory
        ->get('core/tests/fixtures/files/' . $file_name);
    $toolkit = $image->getToolkit();
    $this->assertTrue($image->isValid());
    $image_original_type = $image->getToolkit()
        ->getType();
    $this->assertTrue(imageistruecolor($toolkit->getImage()), "Image '{$file_name}' after load should be a truecolor image, but it is not.");
    // Perform our operation.
    $image->apply($operation, $arguments);
    // Flush Image object to disk storage.
    $file_path = $this->directory . '/' . $test_case . image_type_to_extension($image->getToolkit()
        ->getType());
    $image->save($file_path);
    // Check that the both the GD object and the Image object have an accurate
    // record of the dimensions.
    if (isset($expected['height']) && isset($expected['width'])) {
        $this->assertSame($expected['height'], imagesy($toolkit->getImage()), "Image '{$file_name}' after '{$test_case}' should have a proper height.");
        $this->assertSame($expected['width'], imagesx($toolkit->getImage()), "Image '{$file_name}' after '{$test_case}' should have a proper width.");
        $this->assertSame($expected['height'], $image->getHeight(), "Image '{$file_name}' after '{$test_case}' should have a proper height.");
        $this->assertSame($expected['width'], $image->getWidth(), "Image '{$file_name}' after '{$test_case}' should have a proper width.");
    }
    // Now check each of the corners to ensure color correctness.
    foreach ($expected['corners'] as $key => $expected_color) {
        // The test gif that does not have transparency color set is a
        // special case.
        if ($file_name === 'image-test-no-transparency.gif') {
            if ($test_case == 'desaturate') {
                // For desaturating, keep the expected color from the test
                // data, but set alpha channel to fully opaque.
                $expected_color[3] = 0;
            }
            elseif ($expected_color === static::TRANSPARENT) {
                // Set expected pixel to yellow where the others have
                // transparent.
                $expected_color = static::YELLOW;
            }
        }
        // Get the location of the corner.
        [
            $x,
            $y,
        ] = match ($key) {    0 => [
                0,
                0,
            ],
            1 => [
                $image->getWidth() - 1,
                0,
            ],
            2 => [
                $image->getWidth() - 1,
                $image->getHeight() - 1,
            ],
            3 => [
                0,
                $image->getHeight() - 1,
            ],
        
        };
        $actual_color = $this->getPixelColor($image, $x, $y);
        // If image cannot handle transparent colors, skip the pixel color test.
        if ($actual_color[3] === 0 && $expected_color[3] === 127) {
            continue;
        }
        // JPEG has small differences in color after processing.
        $tolerance = $image_original_type === IMAGETYPE_JPEG ? 3 : 0;
        $this->assertColorsAreEqual($expected_color, $actual_color, $tolerance, "Image '{$file_name}' object after '{$test_case}' action has the correct color placement at corner '{$key}'");
    }
    // Check that saved image reloads without raising PHP errors.
    $image_reloaded = $this->imageFactory
        ->get($file_path);
    $this->assertInstanceOf(\GDImage::class, $image_reloaded->getToolkit()
        ->getImage());
}