view view/ViewProxy.h @ 1534:bfd8b22fd67c

Fix #1904 Scrolling colour 3d plot does not always work when in View normalisation mode. We shouldn't imagine we've just invalidated the cache if the truth is that we've only just created the renderer

/* -*- 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.
*/

#ifndef VIEW_PROXY_H
#define VIEW_PROXY_H

#include "layer/LayerGeometryProvider.h"

#include "data/model/AlignmentModel.h"

class ViewProxy : public LayerGeometryProvider
{
public:
    /**
     * Create a standard ViewProxy for the given view, mapping using
     * the given scale factor. The scale factor is generally used with
     * pixel-doubled "retina" Mac displays and is usually 1 elsewhere.
     */
    ViewProxy(View *view, int scaleFactor) :
        m_view(view), m_scaleFactor(scaleFactor) { }

    /**
     * Create a re-aligning ViewProxy for the given view, mapping
     * using the given scale factor. The scale factor is generally
     * used with pixel-doubled "retina" Mac displays and is usually 1
     * elsewhere. 
     * 
     * Coordinates are mapped through the given alignment model, such
     * that frame values passed from the caller are mapped "from
     * reference" by that alignment before being used by the view or
     * converted to pixel coordinates, and returned values are mapped
     * back "to reference" before being passed back to the caller.
     * 
     * This form of proxy may be created specially for rendering a
     * single layer which comes from a different alignment to that of
     * the rest of the containing view.
     */
    ViewProxy(View *view, int scaleFactor, ModelId alignment) :
        m_view(view), m_scaleFactor(scaleFactor), m_alignment(alignment) { }

    int getId() const override {
        return m_view->getId();
    }
    sv_frame_t getStartFrame() const override {
        return alignToReference(m_view->getStartFrame());
    }
    sv_frame_t getCentreFrame() const override {
        return alignToReference(m_view->getCentreFrame());
    }
    sv_frame_t getEndFrame() const override {
        return alignToReference(m_view->getEndFrame());
    }
    int getXForFrame(sv_frame_t frame) const override {
        //!!! not actually correct, if frame lies between view's pixels
        return m_scaleFactor * m_view->getXForFrame(alignFromReference(frame));
    }
    sv_frame_t getFrameForX(int x) const override {
        sv_frame_t f0 = m_view->getFrameForX(x / m_scaleFactor);
        if (m_scaleFactor == 1) return alignToReference(f0);
        sv_frame_t f1 = m_view->getFrameForX((x / m_scaleFactor) + 1);
        sv_frame_t f = f0 + ((f1 - f0) * (x % m_scaleFactor)) / m_scaleFactor;
        return alignToReference(f);
    }
    int getXForViewX(int viewx) const override {
        return viewx * m_scaleFactor;
    }
    int getViewXForX(int x) const override {
        return x / m_scaleFactor;
    }
    sv_frame_t getModelsStartFrame() const override {
        return alignToReference(m_view->getModelsStartFrame());
    }
    sv_frame_t getModelsEndFrame() const override {
        return alignToReference(m_view->getModelsEndFrame());
    }
    double getYForFrequency(double frequency,
                                    double minFreq, double maxFreq, 
                                    bool logarithmic) const override {
        return m_scaleFactor *
            m_view->getYForFrequency(frequency, minFreq, maxFreq, logarithmic);
    }
    double getFrequencyForY(double y, double minFreq, double maxFreq,
                                    bool logarithmic) const override {
        return m_view->getFrequencyForY
            (y / m_scaleFactor, minFreq, maxFreq, logarithmic);
    }
    int getTextLabelHeight(const Layer *layer, QPainter &paint) const override {
        return m_scaleFactor * m_view->getTextLabelHeight(layer, paint);
    }
    bool getValueExtents(QString unit, double &min, double &max,
                                 bool &log) const override {
        return m_view->getValueExtents(unit, min, max, log);
    }
    ZoomLevel getZoomLevel() const override {
        ZoomLevel z = m_view->getZoomLevel();
        //!!!
//        cerr << "getZoomLevel: from " << z << " to ";
        if (z.zone == ZoomLevel::FramesPerPixel) {
            z.level /= m_scaleFactor;
            if (z.level < 1) {
                z.level = 1;
            }
        } else {
            //!!!???
            z.level *= m_scaleFactor;
        }
//        cerr << z << endl;
        return z;
    }
    QRect getPaintRect() const override {
        QRect r = m_view->getPaintRect();
        return QRect(r.x() * m_scaleFactor,
                     r.y() * m_scaleFactor,
                     r.width() * m_scaleFactor,
                     r.height() * m_scaleFactor);
    }
    QSize getPaintSize() const override {
        return getPaintRect().size();
    }
    int getPaintWidth() const override { 
        return getPaintRect().width();
    }
    int getPaintHeight() const override { 
        return getPaintRect().height();
    }
    bool hasLightBackground() const override {
        return m_view->hasLightBackground();
    }
    QColor getForeground() const override {
        return m_view->getForeground();
    }
    QColor getBackground() const override {
        return m_view->getBackground();
    }
    ViewManager *getViewManager() const override {
        return m_view->getViewManager();
    }
        
    bool shouldIlluminateLocalFeatures(const Layer *layer,
                                               QPoint &point) const override {
        QPoint p;
        bool should = m_view->shouldIlluminateLocalFeatures(layer, p);
        point = QPoint(p.x() * m_scaleFactor, p.y() * m_scaleFactor);
        return should;
    }

    bool shouldShowFeatureLabels() const override {
        return m_view->shouldShowFeatureLabels();
    }

    void drawMeasurementRect(QPainter &p, const Layer *layer,
                                     QRect rect, bool focus) const override {
        m_view->drawMeasurementRect(p, layer, rect, focus);
    }

    void updatePaintRect(QRect r) override {
        m_view->update(r.x() / m_scaleFactor,
                       r.y() / m_scaleFactor,
                       r.width() / m_scaleFactor,
                       r.height() / m_scaleFactor);
    }

    /**
     * Scale up a size in pixels for a hi-dpi display without pixel
     * doubling. This is like ViewManager::scalePixelSize, but taking
     * and returning floating-point values rather than integer
     * pixels. It is also a little more conservative - it never
     * shrinks the size, it can only increase or leave it unchanged.
     */
    double scaleSize(double size) const override {
        return m_view->scaleSize(size * m_scaleFactor);
    }

    /**
     * Integer version of scaleSize.
     */
    int scalePixelSize(int size) const override {
        return m_view->scalePixelSize(size * m_scaleFactor);
    }
    
    /**
     * Scale up pen width for a hi-dpi display without pixel doubling.
     * This is like scaleSize except that it also scales the
     * zero-width case.
     */
    double scalePenWidth(double width) const override {
        if (width <= 0) { // zero-width pen, produce a scaled one-pixel pen
            width = 1;
        }
        width *= sqrt(double(m_scaleFactor));
        return m_view->scalePenWidth(width);
    }

    /**
     * Apply scalePenWidth to a pen.
     */
    QPen scalePen(QPen pen) const override {
        return QPen(pen.color(), scalePenWidth(pen.width()));
    }
    
    View *getView() override { return m_view; }
    const View *getView() const override { return m_view; }

private:
    View *m_view;
    int m_scaleFactor;
    ModelId m_alignment;

    sv_frame_t alignToReference(sv_frame_t frame) const {
        if (auto am = ModelById::getAs<AlignmentModel>(m_alignment)) {
            return am->toReference(frame);
        } else {
            return frame;
        }
    }

    sv_frame_t alignFromReference(sv_frame_t frame) const {
        if (auto am = ModelById::getAs<AlignmentModel>(m_alignment)) {
            return am->fromReference(frame);
        } else {
            return frame;
        }
    }
};

#endif