Chris@1118: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@1118: 
Chris@1118: /*
Chris@1118:     Sonic Visualiser
Chris@1118:     An audio file viewer and annotation editor.
Chris@1118:     Centre for Digital Music, Queen Mary, University of London.
Chris@1118:     
Chris@1118:     This program is free software; you can redistribute it and/or
Chris@1118:     modify it under the terms of the GNU General Public License as
Chris@1118:     published by the Free Software Foundation; either version 2 of the
Chris@1118:     License, or (at your option) any later version.  See the file
Chris@1118:     COPYING included with this distribution for more information.
Chris@1118: */
Chris@1118: 
Chris@1118: #include "ScrollableMagRangeCache.h"
Chris@1118: 
Chris@1118: #include <iostream>
Chris@1118: using namespace std;
Chris@1118: 
Chris@1143: //#define DEBUG_SCROLLABLE_MAG_RANGE_CACHE 1
Chris@1118: 
Chris@1118: void
Chris@1118: ScrollableMagRangeCache::scrollTo(const LayerGeometryProvider *v,
Chris@1118: 				  sv_frame_t newStartFrame)
Chris@1122: {	
Chris@1118:     int dx = (v->getXForFrame(m_startFrame) -
Chris@1118: 	      v->getXForFrame(newStartFrame));
Chris@1118: 
Chris@1118: #ifdef DEBUG_SCROLLABLE_MAG_RANGE_CACHE
Chris@1118:     cerr << "ScrollableMagRangeCache::scrollTo: start frame " << m_startFrame
Chris@1118: 	 << " -> " << newStartFrame << ", dx = " << dx << endl;
Chris@1118: #endif
Chris@1122: 
Chris@1122:     if (m_startFrame == newStartFrame) {
Chris@1122: 	// haven't moved
Chris@1122:         return;
Chris@1122:     }
Chris@1118:     
Chris@1118:     m_startFrame = newStartFrame;
Chris@1118: 
Chris@1118:     if (dx == 0) {
Chris@1118: 	// haven't moved visibly (even though start frame may have changed)
Chris@1118: 	return;
Chris@1118:     }
Chris@1118: 	
Chris@1118:     int w = int(m_ranges.size());
Chris@1118: 
Chris@1118:     if (dx <= -w || dx >= w) {
Chris@1118: 	// scrolled entirely off
Chris@1118: 	invalidate();
Chris@1118: 	return;
Chris@1118:     }
Chris@1118: 	
Chris@1118:     // dx is in range, cache is scrollable
Chris@1118: 
Chris@1118:     if (dx < 0) {
Chris@1118: 	// The new start frame is to the left of the old start
Chris@1118: 	// frame. We need to add some empty ranges at the left (start)
Chris@1118: 	// end and clip the right end. Assemble -dx new values, then
Chris@1118: 	// w+dx old values starting at index 0.
Chris@1118: 
Chris@1118: 	auto newRanges = vector<MagnitudeRange>(-dx);
Chris@1118: 	newRanges.insert(newRanges.end(),
Chris@1122: 			 m_ranges.begin(), m_ranges.begin() + (w + dx));
Chris@1118: 	m_ranges = newRanges;
Chris@1118: 	
Chris@1118:     } else {
Chris@1118: 	// The new start frame is to the right of the old start
Chris@1118: 	// frame. We want to clip the left (start) end and add some
Chris@1118: 	// empty ranges at the right end. Assemble w-dx old values
Chris@1118: 	// starting at index dx, then dx new values.
Chris@1118: 
Chris@1118: 	auto newRanges = vector<MagnitudeRange>(dx);
Chris@1118: 	newRanges.insert(newRanges.begin(),
Chris@1118: 			 m_ranges.begin() + dx, m_ranges.end());
Chris@1118: 	m_ranges = newRanges;
Chris@1118:     }
Chris@1122: 
Chris@1143: #ifdef DEBUG_SCROLLABLE_MAG_RANGE_CACHE
Chris@1136:     cerr << "maxes (" << m_ranges.size() << ") now: ";
Chris@1136:     for (int i = 0; in_range_for(m_ranges, i); ++i) {
Chris@1136: 	cerr << m_ranges[i].getMax() << " ";
Chris@1136:     }
Chris@1136:     cerr << endl;
Chris@1143: #endif
Chris@1122: }
Chris@1122: 
Chris@1122: MagnitudeRange
Chris@1122: ScrollableMagRangeCache::getRange(int x, int count) const
Chris@1122: {
Chris@1122:     MagnitudeRange r;
Chris@1122: #ifdef DEBUG_SCROLLABLE_MAG_RANGE_CACHE
Chris@1122:     cerr << "ScrollableMagRangeCache::getRange(" << x << ", " << count << ")" << endl;
Chris@1122: #endif
Chris@1122:     for (int i = 0; i < count; ++i) {
Chris@1122: 	r.sample(m_ranges.at(x + i));
Chris@1122:     }
Chris@1122:     return r;
Chris@1118: }
Chris@1118: 
Chris@1118: void
Chris@1120: ScrollableMagRangeCache::sampleColumn(int column, const MagnitudeRange &r)
Chris@1120: {
Chris@1120:     if (!in_range_for(m_ranges, column)) {
Chris@1120: 	cerr << "ERROR: ScrollableMagRangeCache::sampleColumn: column " << column
Chris@1120: 	     << " is out of range for cache of width " << m_ranges.size()
Chris@1120: 	     << " (with start frame " << m_startFrame << ")" << endl;
Chris@1120: 	throw logic_error("column out of range");
Chris@1120:     } else {
Chris@1120: 	m_ranges[column].sample(r);
Chris@1120:     }
Chris@1120: }
Chris@1120: