[SFML] wykrywanie koloru poprzez rendertexture+sprite.getcolor

sf::RenderTexture texturka;
if( !texturka.create( 4000, 2000 ) )
{
    return - 1;
}
texturka.clear( sf::Color::Black );

texturka.clear( sf::Color::Black );
texturka.draw( linia );
texturka.draw( text );
texturka.draw( text2 );
texturka.draw( figury[ p ] ); // or any other drawable
texturka.display();

window.setView( View );
window.clear( sf::Color::White );
/*window.draw(linia);

       
        window.draw(text);
        window.draw(text2);
        window.draw(figury[p]);*/
const sf::Texture & texture = texturka.getTexture();
sf::Sprite stexturka( texture );
window.draw( stexturka );
window.display();

testfall = true;
//sf::Image obraz=window.capture();
sf::Color testup, testup1;
sf::Sprite ctextur, ctextur1;
ctextur.setTexture( texture );
ctextur1.setTexture( texture );
for( int i = 0; i < 25; i++ ) {
   
    ctextur.setTextureRect( sf::IntRect( px1 + 25, py1 + 50 + i, 2, 2 ) );
    ctextur1.setTextureRect( sf::IntRect( px1 - 25, py1 + 50 + i, 1, 1 ) );
    testup = ctextur.getColor();
    if( testup ==( sf::Color::White ) ) { cout << px1; }
    if( testup ==( sf::Color::Black ) ) { cout << "test"; }
    testup1 = ctextur1.getColor();
    cout << '\n';
    if( testup ==( sf::Color::Black ) || testup1 ==( sf::Color::Black ) ) { testfall = false; fallup = i; } }
if( testfall == true ) { py1 += 4; }
//if(testfall==false && fallup>0){py1-=fallup; fallup=0;}