annotate main/SVSplash.cpp @ 1480:f1e1745acc3b 3.0-integration

Make the colour 3d plot renderer able to support more than one level of peak cache; introduce a second "peak" cache for the spectrogram layer that actually has a 1-1 column relationship with the underlying FFT model, and use it in addition to the existing peak cache if memory is plentiful. Makes spectrograms appear much faster in many common situations.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "SVSplash.h"

#include "../version.h"

#include <QPainter>
#include <QApplication>
#include <QDesktopWidget>
#include <QSvgRenderer>

#include <cmath>

#include <iostream>
using namespace std;

SVSplash::SVSplash()
{
    setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
    
    QPixmap *p1 = new QPixmap(":icons/scalable/sv-splash.png");

    int w = p1->width(), h = p1->height();
    QRect desk = QApplication::desktop()->availableGeometry();

    double dpratio = devicePixelRatio();
    double widthMultiple = double(desk.width()) / double(w);

    int sw = w, sh = h;

    if (widthMultiple > 2.5 || dpratio > 1.0) {

	// Hi-dpi either via pixel doubling or simply via lots of
	// pixels

	double factor = widthMultiple / 2.5;
	if (factor < 1.0) factor = 1.0;
	sw = int(floor(w * factor));
	sh = int(floor(h * factor));

	delete p1;
	m_pixmap = new QPixmap(int(floor(sw * dpratio)),
			       int(floor(sh * dpratio)));

//	cerr << "pixmap size = " << m_pixmap->width() << " * "
//	     << m_pixmap->height() << endl;
	
	m_pixmap->fill(Qt::red);
	QSvgRenderer renderer(QString(":icons/scalable/sv-splash.svg"));
	QPainter painter(m_pixmap);
	renderer.render(&painter);
	painter.end();

    } else {
	// The "low dpi" case
	m_pixmap = p1;
    }
    
    setFixedWidth(sw);
    setFixedHeight(sh);
    setGeometry(desk.x() + desk.width()/2 - sw/2,
		desk.y() + desk.height()/2 - sh/2,
		sw, sh);
}

SVSplash::~SVSplash()
{
    delete m_pixmap;
}

void
SVSplash::finishSplash(QWidget *w)
{
    finish(w);
}

void
SVSplash::drawContents(QPainter *painter)
{
    painter->drawPixmap(rect(), *m_pixmap, m_pixmap->rect());
    QString text = QString("v%1").arg(SV_VERSION);
    painter->drawText
	(width() - painter->fontMetrics().width(text) - (width()/50),
	 (width()/70) + painter->fontMetrics().ascent(),
	 text);
}