Method fitImageToFormat

Gui/ViewerGL.cpp:2930–2992

}

void
ViewerGL::fitImageToFormat()
{
    // always running in the main thread
    assert( qApp && qApp->thread() == QThread::currentThread() );
    // size in Canonical = Zoom coordinates !
    double w, h;
    const RectD& tex0Format = _imp->displayTextures[0].format;
    if (tex0Format.isNull()) {
        return;
    }
    w = tex0Format.width();
    h = tex0Format.height();

    if (w <= 0 || h <= 0) {
        return;
    }

    double old_zoomFactor;
    double zoomFactor;
    unsigned int oldMipMapLevel, newMipMapLevel;
    {
        QMutexLocker(&_imp->zoomCtxMutex);
        old_zoomFactor = _imp->zoomCtx.factor();
        //oldMipMapLevel = std::log( old_zoomFactor >= 1 ? 1 :
        //                           std::pow( 2, -std::ceil(std::log(old_zoomFactor) / M_LN2) ) ) / M_LN2;
        oldMipMapLevel = old_zoomFactor >= 1 ? 0 : -std::ceil(std::log(old_zoomFactor) / M_LN2);

        // set the PAR first
        //_imp->zoomCtx.setZoom(0., 0., 1., 1.);
        // leave 4% of margin around
        _imp->zoomCtx.fit(-0.02 * w, 1.02 * w, -0.02 * h, 1.02 * h);
        zoomFactor = _imp->zoomCtx.factor();
    }
    _imp->zoomOrPannedSinceLastFit = false;
    //newMipMapLevel = std::log( zoomFactor >= 1 ? 1 :
    //                           std::pow( 2, -std::ceil(std::log(zoomFactor) / M_LN2) ) ) / M_LN2;
    newMipMapLevel = zoomFactor >= 1 ? 0 : -std::ceil(std::log(zoomFactor) / M_LN2);

    _imp->oldClick = QPoint(); // reset mouse posn

    if (old_zoomFactor != zoomFactor) {
        int zoomFactorInt = zoomFactor  * 100;
        if (zoomFactorInt == 0) {
            zoomFactorInt = 1;
        }
        Q_EMIT zoomChanged(zoomFactorInt);
    }

    if ( _imp->viewerTab->isViewersSynchroEnabled() ) {
        _imp->viewerTab->synchronizeOtherViewersProjection();
    }

    if (newMipMapLevel != oldMipMapLevel) {
        ///Clear green cached line so the user doesn't expect to see things in the cache
        ///since we're changing the zoom factor
        _imp->viewerTab->clearTimelineCacheLine();
    }