Convert a true color image to a palette image with 256 colors and preserve transparency
| public convertToPaletteImage ( ) : static | ||
| Результат | static | |
/**
* Tests the convertToPaletteImage() method from a true color image.
*/
public function testConvertToPaletteImageFromTrueColor()
{
$image = imagecreatetruecolor(100, 100);
for ($x = 0; $x < 100; ++$x) {
for ($y = 0; $y < 100; ++$y) {
imagefilledrectangle($image, $x, $y, $x + 1, $y + 1, imagecolorallocatealpha($image, $x, $y, 0, 0));
}
}
// Bottom right pixel transparent
imagealphablending($image, false);
imagefilledrectangle($image, 99, 99, 100, 100, imagecolorallocatealpha($image, 0, 0, 0, 127));
$image = new GdImage($image);
$image->convertToPaletteImage();
$this->assertInternalType('resource', $image->getResource());
$this->assertFalse(imageistruecolor($image->getResource()));
$this->assertEquals(256, imagecolorstotal($image->getResource()));
$this->assertEquals(127, imagecolorsforindex($image->getResource(), imagecolorat($image->getResource(), 99, 99))['alpha'], 'Bottom right pixel should be transparent');
}
