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<?php
declare(strict_types = 1);
namespace BaconQrCodeTest\Renderer\Color;
use BaconQrCode\Renderer\Color\Cmyk;
use BaconQrCode\Renderer\Color\Gray;
use BaconQrCode\Renderer\Color\Rgb;
use PHPUnit\Framework\TestCase;
final class RgbTest extends TestCase
{
public function testToRgb() : void
{
$rgb = new Rgb(10, 20, 30);
$this->assertSame($rgb, $rgb->toRgb(), 'toRgb should return $this');
}
/**
* Tests RGB to CMYK conversion, focusing on:
* 1. Handling the special case RGB(0, 0, 0) -> CMYK(0, 0, 0, 100).
* 2. Correct application of rounding.
*/
public function testToCmyk() : void
{
// Special Case: Black (0, 0, 0) -> C:0, M:0, Y:0, K:100
$rgbBlack = new Rgb(0, 0, 0);
$this->assertEquals(new Cmyk(0, 0, 0, 100), $rgbBlack->toCmyk(), 'RGB Black to CMYK (special case)');
// White (255, 255, 255) -> C:0, M:0, Y:0, K:0
$rgbWhite = new Rgb(255, 255, 255);
$this->assertEquals(new Cmyk(0, 0, 0, 0), $rgbWhite->toCmyk(), 'RGB White to CMYK');
// Pure Red (255, 0, 0) -> C:0, M:100, Y:100, K:0
$rgbRed = new Rgb(255, 0, 0);
$this->assertEquals(new Cmyk(0, 100, 100, 0), $rgbRed->toCmyk(), 'RGB Red to CMYK');
// Complex Color checking rounding: RGB(100, 150, 200)
// K=22 (round(100 * 0.2156))
// C=50 (round(100 * 0.3922 / 0.7844))
// M=25 (round(100 * 0.1961 / 0.7844))
// Y=0
$rgbCustom = new Rgb(100, 150, 200);
$this->assertEquals(new Cmyk(50, 25, 0, 22), $rgbCustom->toCmyk(), 'RGB Custom to CMYK (rounding check)');
}
/**
* Tests RGB to Gray conversion, focusing on:
* 1. Correct luminance coefficients (0.2126, 0.7152, 0.0722).
* 2. Integer-based calculation to avoid floating-point precision loss.
* 3. Correct application of rounding.
*/
public function testToGray() : void
{
// Black (0, 0, 0) -> Gray(0)
$rgbBlack = new Rgb(0, 0, 0);
$this->assertEquals(new Gray(0), $rgbBlack->toGray(), 'RGB Black to Gray');
// White (255, 255, 255) -> Gray(100)
$rgbWhite = new Rgb(255, 255, 255);
$this->assertEquals(new Gray(100), $rgbWhite->toGray(), 'RGB White to Gray');
// Pure Red (255, 0, 0)
// round((255 * 2126) / 25500) = round(21.26) = 21
$rgbRed = new Rgb(255, 0, 0);
$this->assertEquals(new Gray(21), $rgbRed->toGray(), 'RGB Red to Gray');
// Pure Green (0, 255, 0)
// round((255 * 7152) / 25500) = round(71.52) = 72
$rgbGreen = new Rgb(0, 255, 0);
$this->assertEquals(new Gray(72), $rgbGreen->toGray(), 'RGB Green to Gray');
// Complex Color checking rounding: RGB(100, 150, 200)
// round((100*2126 + 150*7152 + 200*722) / 25500) = round(56.07...) = 56
$rgbCustom = new Rgb(100, 150, 200);
$this->assertEquals(new Gray(56), $rgbCustom->toGray(), 'RGB Custom to Gray (rounding check)');
}
}
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