Method paintGL

Gui/Histogram.cpp:1149–1231

#endif // ifdef NATRON_HISTOGRAM_USING_OPENGL

void
Histogram::paintGL()
{
    // always running in the main thread
    assert( qApp && qApp->thread() == QThread::currentThread() );
    assert( QOpenGLContext::currentContext() == context() );

    if ( !appPTR->isOpenGLLoaded() ) {
        return;
    }


    glCheckError();
    double w = (double)width();
    double h = (double)height();

    ///don't bother painting an invisible widget, this may be caused to a splitter collapsed.
    if ( (w <= 1) || (h <= 1) ) {
        return;
    }

    {
        double screenPixelRatio = getScreenPixelRatio();
        if (screenPixelRatio != _imp->_screenPixelRatio) {
            _imp->_screenPixelRatio = screenPixelRatio;
            _imp->_textFont.reset(new QFont(appFont, appFontSize * screenPixelRatio));
        }
    }
    assert(_imp->_textFont);

    assert(_imp->zoomCtx.factor() > 0.);

    double zoomLeft = _imp->zoomCtx.left();
    double zoomRight = _imp->zoomCtx.right();
    double zoomBottom = _imp->zoomCtx.bottom();
    double zoomTop = _imp->zoomCtx.top();
    if ( (zoomLeft == zoomRight) || (zoomTop == zoomBottom) ) {
        glClearColor(0, 0, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT);
        glCheckErrorIgnoreOSXBug();

        return;
    }

    {
        GLProtectAttrib a(GL_TRANSFORM_BIT | GL_COLOR_BUFFER_BIT);
        GLProtectMatrix p(GL_PROJECTION);
        glLoadIdentity();
        glOrtho(zoomLeft, zoomRight, zoomBottom, zoomTop, 1, -1);
        GLProtectMatrix m(GL_MODELVIEW);
        glLoadIdentity();
        glCheckError();

        glClearColor(0, 0, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT);
        glCheckErrorIgnoreOSXBug();

        _imp->drawScale();