Added old abandoned KDE3 version of the RoseGarden MIDI tool

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/rosegarden@1097595 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 316 insertions, 0 deletions

diff --git a/src/gui/editors/segment/segmentcanvas/AudioPreviewPainter.cpp b/src/gui/editors/segment/segmentcanvas/AudioPreviewPainter.cpp
new file mode 100644
index 0000000..1b982dc
--- /dev/null
+++ b/src/gui/editors/segment/segmentcanvas/AudioPreviewPainter.cpp
@@ -0,0 +1,316 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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 "AudioPreviewPainter.h"
+
+#include "CompositionModelImpl.h"
+#include "CompositionColourCache.h"
+#include "base/Composition.h"
+#include "base/Track.h"
+#include "base/AudioLevel.h"
+#include "base/Studio.h"
+
+#include "misc/Debug.h"
+#include "document/ConfigGroups.h"
+
+#include <qimage.h>
+#include <qapplication.h>
+
+#include <kapp.h>
+#include <kconfig.h>
+
+namespace Rosegarden {
+
+AudioPreviewPainter::AudioPreviewPainter(CompositionModelImpl& model,
+					 CompositionModel::AudioPreviewData* apData,
+					 const Composition &composition,
+					 const Segment* segment)
+    : m_model(model),
+      m_apData(apData),
+      m_composition(composition),
+      m_segment(segment),
+      m_rect(model.computeSegmentRect(*(segment))),
+      m_image(1, 1, 8, 4),
+      m_defaultCol(CompositionColourCache::getInstance()->SegmentAudioPreview),
+      m_height(model.grid().getYSnap()/2)
+{
+    int pixWidth = std::min(m_rect.getBaseWidth(), tileWidth());
+
+    m_image = QImage(pixWidth, m_rect.height(), 8, 4);
+    m_image.setAlphaBuffer(true);
+
+    m_penWidth = (std::max(1U, m_rect.getPen().width()) * 2);
+    m_halfRectHeight = m_model.grid().getYSnap()/2 - m_penWidth / 2 - 2;
+}
+
+int AudioPreviewPainter::tileWidth()
+{
+    static int tw = -1;
+    if (tw == -1) tw = QApplication::desktop()->width();
+    return tw;
+}
+
+void AudioPreviewPainter::paintPreviewImage()
+{
+    const std::vector<float>& values = m_apData->getValues();
+
+    if (values.size() == 0)
+        return;
+        
+    float gain[2] = { 1.0, 1.0 };
+    int instrumentChannels = 2;
+    TrackId trackId = m_segment->getTrack();
+    Track *track = m_model.getComposition().getTrackById(trackId);
+    if (track) {
+        Instrument *instrument = m_model.getStudio().getInstrumentById(track->getInstrument());
+        if (instrument) {
+            float level = AudioLevel::dB_to_multiplier(instrument->getLevel());
+            float pan = instrument->getPan() - 100.0;
+            gain[0] = level * ((pan > 0.0) ? (1.0 - (pan / 100.0)) : 1.0);
+            gain[1] = level * ((pan < 0.0) ? ((pan + 100.0) / 100.0) : 1.0);
+	    instrumentChannels = instrument->getAudioChannels();
+        }
+    }
+
+    bool showMinima = m_apData->showsMinima();
+    unsigned int channels = m_apData->getChannels();
+    if (channels == 0) {
+        RG_DEBUG << "AudioPreviewPainter::paintPreviewImage : problem with audio file for segment "
+                 << m_segment->getLabel().c_str() << endl;
+        return;
+    }
+
+    int samplePoints = values.size() / (channels * (showMinima ? 2 : 1));
+    float h1, h2, l1 = 0, l2 = 0;
+    double sampleScaleFactor = samplePoints / double(m_rect.getBaseWidth());
+    m_sliceNb = 0;
+
+    m_image.fill(0);
+
+    int centre = m_image.height() / 2;
+
+    RG_DEBUG << "AudioPreviewPainter::paintPreviewImage width = " << m_rect.getBaseWidth() << ", height = " << m_rect.height() << ", halfRectHeight = " << m_halfRectHeight << endl;
+
+    RG_DEBUG << "AudioPreviewPainter::paintPreviewImage: channels = " << channels << ", gain left = " << gain[0] << ", right = " << gain[1] << endl;
+
+    double audioDuration = double(m_segment->getAudioEndTime().sec) +
+	double(m_segment->getAudioEndTime().nsec) / 1000000000.0;
+
+    // We need to take each pixel value and map it onto a point within
+    // the preview.  We have samplePoints preview points in a known
+    // duration of audioDuration.  Thus each point spans a real time
+    // of audioDuration / samplePoints.  We need to convert the
+    // accumulated real time back into musical time, and map this
+    // proportionately across the segment width.
+
+    RealTime startRT =
+	m_model.getComposition().getElapsedRealTime(m_segment->getStartTime());
+    double startTime = double(startRT.sec) + double(startRT.nsec) / 1000000000.0;
+
+    RealTime endRT =
+	m_model.getComposition().getElapsedRealTime(m_segment->getEndMarkerTime());
+    double endTime = double(endRT.sec) + double(endRT.nsec) / 1000000000.0;
+
+    bool haveTempoChange = false;
+
+    int finalTempoChangeNumber =
+	m_model.getComposition().getTempoChangeNumberAt
+	(m_segment->getEndMarkerTime());
+
+    if ((finalTempoChangeNumber >= 0) &&
+
+	(finalTempoChangeNumber > 
+	 m_model.getComposition().getTempoChangeNumberAt
+	 (m_segment->getStartTime()))) {
+
+	haveTempoChange = true;
+    }
+
+    KConfig* config = kapp->config();
+    config->setGroup(GeneralOptionsConfigGroup);
+
+    bool meterLevels = (config->readUnsignedNumEntry("audiopreviewstyle", 1)
+			== 1);
+
+    for (int i = 0; i < m_rect.getBaseWidth(); ++i) {
+
+	// i is the x coordinate within the rectangle.  We need to
+	// calculate the position within the audio preview from which
+	// to draw the peak for this coordinate.  It's possible there
+	// may be more than one, in which case we need to find the
+	// peak of all of them.
+
+	int position = 0;
+
+	if (haveTempoChange) {
+	    
+	    // First find the time corresponding to this i.
+	    timeT musicalTime =
+		m_model.grid().getRulerScale()->getTimeForX(m_rect.x() + i);
+	    RealTime realTime =
+		m_model.getComposition().getElapsedRealTime(musicalTime);
+	    
+	    double time = double(realTime.sec) +
+		double(realTime.nsec) / 1000000000.0;
+	    double offset = time - startTime;
+
+	    if (endTime > startTime) {
+		position = offset * m_rect.getBaseWidth() / (endTime - startTime);
+		position = int(channels * position);
+	    }
+	    
+	} else {
+
+	    position = int(channels * i * sampleScaleFactor);
+	}
+
+        if (position < 0) continue;
+
+        if (position >= values.size() - channels) {
+            finalizeCurrentSlice();
+            break;
+        }
+
+        if (channels == 1) {
+
+            h1 = values[position++];
+            h2 = h1;
+
+            if (showMinima) {
+                l1 = values[position++];
+                l2 = l1;
+            }
+        } else {
+
+            h1 = values[position++];
+            if (showMinima) l1 = values[position++];
+
+            h2 = values[position++];
+            if (showMinima) l2 = values[position++];
+            
+        }
+
+	if (instrumentChannels == 1 && channels == 2) {
+	    h1 = h2 = (h1 + h2) / 2;
+	    l1 = l2 = (l1 + l2) / 2;
+	}
+
+	h1 *= gain[0];
+	h2 *= gain[1];
+	
+	l1 *= gain[0];
+	l2 *= gain[1];
+
+        int width = 1;
+	int pixel;
+
+        // h1 left, h2 right
+        if (h1 >= 1.0) { h1 = 1.0; pixel = 2; }
+	else { pixel = 1; }
+
+        int h;
+
+	if (meterLevels) {
+	    h = AudioLevel::multiplier_to_preview(h1, m_height);
+	} else {
+	    h = h1 * m_height;
+	}
+        if (h <= 0) h = 1;
+	if (h > m_halfRectHeight) h = m_halfRectHeight;
+
+        int rectX = i % tileWidth();
+
+	for (int py = 0; py < h; ++py) {
+	    m_image.setPixel(rectX, centre - py, pixel);
+	}
+	
+        if (h2 >= 1.0) { h2 = 1.0; pixel = 2; }
+        else { pixel = 1; }
+
+	if (meterLevels) {
+	    h = AudioLevel::multiplier_to_preview(h2, m_height);
+	} else {
+	    h = h2 * m_height;
+	}
+        if (h < 0) h = 0;
+	
+	for (int py = 0; py < h; ++py) {
+	    m_image.setPixel(rectX, centre + py, pixel);
+	}
+
+        if (((i+1) % tileWidth()) == 0 || i == (m_rect.getBaseWidth() - 1)) {
+            finalizeCurrentSlice();
+        }
+    }
+
+/* Auto-fade not yet implemented.
+
+    if (m_segment->isAutoFading()) {
+
+        Composition &comp = m_model.getComposition();
+
+        int audioFadeInEnd = int(
+                                 m_model.grid().getRulerScale()->getXForTime(comp.
+                                                                     getElapsedTimeForRealTime(m_segment->getFadeInTime()) +
+                                                                     m_segment->getStartTime()) -
+                                 m_model.grid().getRulerScale()->getXForTime(m_segment->getStartTime()));
+
+        m_p.setPen(Qt::blue);
+        m_p.drawRect(0,  m_apData->getSegmentRect().height() - 1, audioFadeInEnd, 1);
+        m_pb.drawRect(0, m_apData->getSegmentRect().height() - 1, audioFadeInEnd, 1);
+    }
+
+    m_p.end();
+    m_pb.end();
+*/
+}
+
+void AudioPreviewPainter::finalizeCurrentSlice()
+{
+//     RG_DEBUG << "AudioPreviewPainter::finalizeCurrentSlice : copying pixmap to image at " << m_sliceNb * tileWidth() << endl;
+
+    // transparent background
+    m_image.setColor(0, qRgba(255, 255, 255, 0));
+
+    // foreground from computeSegmentPreviewColor
+    QColor c = m_model.computeSegmentPreviewColor(m_segment);
+    QRgb rgba = qRgba(c.red(), c.green(), c.blue(), 255);
+    m_image.setColor(1, rgba);
+
+    // red for clipping
+    m_image.setColor(2, qRgba(255, 0, 0, 255));
+
+    m_previewPixmaps.push_back(m_image.copy());
+
+    m_image.fill(0);
+
+    ++m_sliceNb;
+}
+
+PixmapArray AudioPreviewPainter::getPreviewImage()
+{
+    return m_previewPixmaps;
+}
+
+}