Fit Image/video to app window (using OpenFrameworks)

image_fit.cpp

float width = ofGetWidth();
float height = ofGetHeight();
float aspect = width / height;

// horizontal black bars
if (aspect <= player.getWidth()/player.getHeight()) {
    float vHeight = (player.getHeight() * width) / player.getWidth();
    player.draw(0,
                (height - vHeight) * 0.5,
                width,
                vHeight);
} else { // vertical black bars
    float vWidth = (player.getWidth() * height) / player.getHeight();
    player.draw((width - vWidth) * 0.5,
                0,
                vWidth,
                height);
}