Chris@1071: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@1071: 
Chris@1071: /*
Chris@1071:     Sonic Visualiser
Chris@1071:     An audio file viewer and annotation editor.
Chris@1071:     Centre for Digital Music, Queen Mary, University of London.
Chris@1071:     This file copyright 2006-2016 Chris Cannam and QMUL.
Chris@1071:     
Chris@1071:     This program is free software; you can redistribute it and/or
Chris@1071:     modify it under the terms of the GNU General Public License as
Chris@1071:     published by the Free Software Foundation; either version 2 of the
Chris@1071:     License, or (at your option) any later version.  See the file
Chris@1071:     COPYING included with this distribution for more information.
Chris@1071: */
Chris@1071: 
Chris@1071: #include "Colour3DPlotRenderer.h"
Chris@1074: #include "RenderTimer.h"
Chris@1071: 
Chris@1075: #include "data/model/DenseThreeDimensionalModel.h"
Chris@1075: #include "data/model/Dense3DModelPeakCache.h"
Chris@1075: #include "data/model/FFTModel.h"
Chris@1075: 
Chris@1077: #include "LayerGeometryProvider.h"
Chris@1082: #include "VerticalBinLayer.h"
Chris@1075: 
Chris@1079: #include <vector>
Chris@1079: 
Chris@1079: using namespace std;
Chris@1079: 
Chris@1073: Colour3DPlotRenderer::RenderResult
Chris@1090: Colour3DPlotRenderer::render(LayerGeometryProvider *v, QPainter &paint, QRect rect)
Chris@1076: {
Chris@1090:     return render(v, paint, rect, false);
Chris@1076: }
Chris@1076: 
Chris@1076: Colour3DPlotRenderer::RenderResult
Chris@1090: Colour3DPlotRenderer::renderTimeConstrained(LayerGeometryProvider *v,
Chris@1090:                                             QPainter &paint, QRect rect)
Chris@1076: {
Chris@1090:     return render(v, paint, rect, true);
Chris@1076: }
Chris@1076: 
Chris@1076: Colour3DPlotRenderer::RenderResult
Chris@1090: Colour3DPlotRenderer::render(LayerGeometryProvider *v,
Chris@1090:                              QPainter &paint, QRect rect, bool timeConstrained)
Chris@1073: {
Chris@1079:     sv_frame_t startFrame = v->getStartFrame();
Chris@1079:     
Chris@1079:     int x0 = v->getXForViewX(rect.x());
Chris@1079:     int x1 = v->getXForViewX(rect.x() + rect.width());
Chris@1079:     if (x0 < 0) x0 = 0;
Chris@1079:     if (x1 > v->getPaintWidth()) x1 = v->getPaintWidth();
Chris@1079: 
Chris@1079:     m_cache.resize(v->getPaintSize());
Chris@1079:     m_cache.setZoomLevel(v->getZoomLevel());
Chris@1079: 
Chris@1090:     cerr << "cache start " << m_cache.getStartFrame()
Chris@1090:          << " view start " << startFrame
Chris@1090:          << " valid left " << m_cache.getValidLeft()
Chris@1090:          << " valid right " << m_cache.getValidRight()
Chris@1090:          << " x0 " << x0
Chris@1090:          << " x1 " << x1
Chris@1090:          << endl;
Chris@1090: 
Chris@1090:     
Chris@1079:     if (m_cache.isValid()) { // some part of the cache is valid
Chris@1079: 
Chris@1079:         if (v->getXForFrame(m_cache.getStartFrame()) ==
Chris@1079:             v->getXForFrame(startFrame) &&
Chris@1079:             m_cache.getValidLeft() <= x0 &&
Chris@1079:             m_cache.getValidRight() >= x1) {
Chris@1090: 
Chris@1090:             cerr << "cache hit" << endl;
Chris@1090:             
Chris@1079:             // cache is valid for the complete requested area
Chris@1079:             paint.drawImage(rect, m_cache.getImage(), rect);
Chris@1079:             return { rect, {} };
Chris@1079: 
Chris@1079:         } else {
Chris@1090:             cerr << "cache partial hit" << endl;
Chris@1090:             
Chris@1079:             // cache doesn't begin at the right frame or doesn't
Chris@1079:             // contain the complete view, but might be scrollable or
Chris@1079:             // partially usable
Chris@1090:             m_cache.scrollTo(v, startFrame);
Chris@1079: 
Chris@1079:             // if we are not time-constrained, then we want to paint
Chris@1081:             // the whole area in one go; we don't return a partial
Chris@1081:             // paint. To avoid providing the more complex logic to
Chris@1081:             // handle painting discontiguous areas, if the only valid
Chris@1079:             // part of cache is in the middle, just make the whole
Chris@1079:             // thing invalid and start again.
Chris@1079:             if (!timeConstrained) {
Chris@1079:                 if (m_cache.getValidLeft() > x0 &&
Chris@1079:                     m_cache.getValidRight() < x1) {
Chris@1079:                     m_cache.invalidate();
Chris@1079:                 }
Chris@1079:             }
Chris@1079:         }
Chris@1090:     } else {
Chris@1090:         // cache completely invalid
Chris@1090:         m_cache.setStartFrame(startFrame);
Chris@1075:     }
Chris@1075: 
Chris@1079:     bool rightToLeft = false;
Chris@1079: 
Chris@1079:     if (!m_cache.isValid() && timeConstrained) {
Chris@1081:         // When rendering the whole area, in a context where we might
Chris@1081:         // not be able to complete the work, start from somewhere near
Chris@1081:         // the middle so that the region of interest appears first
Chris@1079: 
Chris@1079:         //!!! (perhaps we should avoid doing this if past repaints
Chris@1079:         //!!! have been fast enough to do the whole in one shot)
Chris@1079:         if (x0 == 0 && x1 == v->getPaintWidth()) {
Chris@1079:             x0 = int(x1 * 0.3);
Chris@1079:         }
Chris@1079:     }
Chris@1079: 
Chris@1079:     if (m_cache.isValid()) {
Chris@1090:             cerr << "cache somewhat valid" << endl;
Chris@1090:             
Chris@1079:         // When rendering only a part of the cache, we need to make
Chris@1079:         // sure that the part we're rendering is adjacent to (or
Chris@1079:         // overlapping) a valid area of cache, if we have one. The
Chris@1079:         // alternative is to ditch the valid area of cache and render
Chris@1079:         // only the requested area, but that's risky because this can
Chris@1079:         // happen when just waving the pointer over a small part of
Chris@1079:         // the view -- if we lose the partly-built cache every time
Chris@1079:         // the user does that, we'll never finish building it.
Chris@1079:         int left = x0;
Chris@1079:         int width = x1 - x0;
Chris@1079:         bool isLeftOfValidArea = false;
Chris@1079:         m_cache.adjustToTouchValidArea(left, width, isLeftOfValidArea);
Chris@1079:         x0 = left;
Chris@1079:         x1 = x0 + width;
Chris@1079: 
Chris@1079:         // That call also told us whether we should be painting
Chris@1079:         // sub-regions of our target region in right-to-left order in
Chris@1079:         // order to ensure contiguity
Chris@1079:         rightToLeft = isLeftOfValidArea;
Chris@1079:     }
Chris@1075:     
Chris@1090:     renderToCache(v, x0, x1 - x0, rightToLeft, timeConstrained);
Chris@1079: 
Chris@1079:     QRect pr = rect & m_cache.getValidArea();
Chris@1079:     paint.drawImage(pr.x(), pr.y(), m_cache.getImage(),
Chris@1079:                     pr.x(), pr.y(), pr.width(), pr.height());
Chris@1079: 
Chris@1079:     if (!timeConstrained && (pr != rect)) {
Chris@1079:         //!!! on a first cut, there is a risk that this will happen
Chris@1079:         //!!! when we are at start/end of model -- trap, report, and
Chris@1079:         //!!! then fix
Chris@1079:         throw std::logic_error("internal error: failed to render entire requested rect even when not time-constrained");
Chris@1079:     }
Chris@1079:     
Chris@1079:     return { pr, {} };
Chris@1079: 
Chris@1073:     //!!! todo: timing/incomplete paint
Chris@1073: 
Chris@1073:     //!!! todo: peak frequency style
Chris@1073: 
Chris@1073:     //!!! todo: transparent style from Colour3DPlot
Chris@1074: 
Chris@1074:     //!!! todo: bin boundary alignment when in BinResolution
Chris@1074: 
Chris@1079:     //!!! todo: view magnitudes / normalise visible area
Chris@1079: 
Chris@1079:     //!!! todo: alter documentation for view mag stuff (cached paints
Chris@1079:     //!!! do not update MagnitudeRange)
Chris@1079: 
Chris@1079:     //!!! todo, here or in caller: illuminateLocalFeatures
Chris@1079: 
Chris@1079:     //!!! fft model scaling?
Chris@1079:     
Chris@1079:     //!!! should we own the Dense3DModelPeakCache here? or should it persist
Chris@1073: }
Chris@1073: 
Chris@1080: void
Chris@1090: Colour3DPlotRenderer::renderToCache(LayerGeometryProvider *v,
Chris@1090:                                     int x0, int repaintWidth,
Chris@1080:                                     bool rightToLeft, bool timeConstrained)
Chris@1079: {
Chris@1079:     // Draw to the draw buffer, and then scale-copy from there.
Chris@1079: 
Chris@1079:     DenseThreeDimensionalModel *model = m_sources.source;
Chris@1079:     if (!model || !model->isOK() || !model->isReady()) {
Chris@1079: 	throw std::logic_error("no source model provided, or model not ready");
Chris@1079:     }
Chris@1079: 
Chris@1079:     // The draw buffer contains a fragment at either our pixel
Chris@1079:     // resolution (if there is more than one time-bin per pixel) or
Chris@1079:     // time-bin resolution (if a time-bin spans more than one pixel).
Chris@1079:     // We need to ensure that it starts and ends at points where a
Chris@1079:     // time-bin boundary occurs at an exact pixel boundary, and with a
Chris@1079:     // certain amount of overlap across existing pixels so that we can
Chris@1079:     // scale and draw from it without smoothing errors at the edges.
Chris@1079: 
Chris@1079:     // If (getFrameForX(x) / increment) * increment ==
Chris@1079:     // getFrameForX(x), then x is a time-bin boundary.  We want two
Chris@1079:     // such boundaries at either side of the draw buffer -- one which
Chris@1079:     // we draw up to, and one which we subsequently crop at.
Chris@1079: 
Chris@1079:     bool bufferIsBinResolution = false;
Chris@1079:     int binResolution = model->getResolution();
Chris@1079:     int zoomLevel = v->getZoomLevel();
Chris@1079:     if (binResolution > zoomLevel) bufferIsBinResolution = true;
Chris@1079: 
Chris@1079:     sv_frame_t leftBoundaryFrame = -1, leftCropFrame = -1;
Chris@1079:     sv_frame_t rightBoundaryFrame = -1, rightCropFrame = -1;
Chris@1079: 
Chris@1079:     int drawWidth;
Chris@1079: 
Chris@1079:     if (bufferIsBinResolution) {
Chris@1079:         for (int x = x0; ; --x) {
Chris@1079:             sv_frame_t f = v->getFrameForX(x);
Chris@1079:             if ((f / binResolution) * binResolution == f) {
Chris@1079:                 if (leftCropFrame == -1) leftCropFrame = f;
Chris@1079:                 else if (x < x0 - 2) {
Chris@1079:                     leftBoundaryFrame = f;
Chris@1079:                     break;
Chris@1079:                 }
Chris@1079:             }
Chris@1079:         }
Chris@1079:         for (int x = x0 + repaintWidth; ; ++x) {
Chris@1079:             sv_frame_t f = v->getFrameForX(x);
Chris@1079:             if ((f / binResolution) * binResolution == f) {
Chris@1079:                 if (rightCropFrame == -1) rightCropFrame = f;
Chris@1079:                 else if (x > x0 + repaintWidth + 2) {
Chris@1079:                     rightBoundaryFrame = f;
Chris@1079:                     break;
Chris@1079:                 }
Chris@1079:             }
Chris@1079:         }
Chris@1079:         drawWidth = int((rightBoundaryFrame - leftBoundaryFrame) / binResolution);
Chris@1079:     } else {
Chris@1079:         drawWidth = repaintWidth;
Chris@1079:     }
Chris@1079:     
Chris@1079:     // We always paint the full height.  Smaller heights can be used
Chris@1079:     // when painting direct from cache (outside this function), but we
Chris@1079:     // want to ensure the cache is coherent without having to worry
Chris@1079:     // about vertical matching of required and valid areas as well as
Chris@1079:     // horizontal. That's why this function didn't take any y/height
Chris@1079:     // parameters.
Chris@1079:     int h = v->getPaintHeight();
Chris@1079: 
Chris@1079:     clearDrawBuffer(drawWidth, h);
Chris@1079: 
Chris@1079:     vector<int> binforx(drawWidth);
Chris@1079:     vector<double> binfory(h);
Chris@1079:     
Chris@1079:     bool usePeaksCache = false;
Chris@1079:     int binsPerPeak = 1;
Chris@1079: 
Chris@1079:     if (bufferIsBinResolution) {
Chris@1080: 
Chris@1079:         for (int x = 0; x < drawWidth; ++x) {
Chris@1079:             binforx[x] = int(leftBoundaryFrame / binResolution) + x;
Chris@1079:         }
Chris@1080: 
Chris@1080:         // calculating boundaries later will be too fiddly for partial
Chris@1080:         // paints, and painting should be fast anyway when this is the
Chris@1080:         // case because it means we're well zoomed in
Chris@1080:         timeConstrained = false;
Chris@1080: 
Chris@1079:     } else {
Chris@1079:         for (int x = 0; x < drawWidth; ++x) {
Chris@1090:             sv_frame_t f0 = v->getFrameForX(x0 + x);
Chris@1079:             double s0 = double(f0 - model->getStartFrame()) / binResolution;
Chris@1079:             binforx[x] = int(s0 + 0.0001);
Chris@1079:         }
Chris@1079: 
Chris@1079:         if (m_sources.peaks) { // peaks cache exists
Chris@1079: 
Chris@1079:             binsPerPeak = m_sources.peaks->getColumnsPerPeak();
Chris@1079:             usePeaksCache = (binResolution * binsPerPeak) < zoomLevel;
Chris@1079: 
Chris@1079:             if (m_params.colourScale.getScale() ==
Chris@1079:                 ColourScale::PhaseColourScale) {
Chris@1079:                 usePeaksCache = false;
Chris@1079:             }
Chris@1079:         }
Chris@1079:     }
Chris@1082: 
Chris@1080:     for (int y = 0; y < h; ++y) {
Chris@1090:         binfory[y] = m_sources.verticalBinLayer->getBinForY(v, h - y - 1);
Chris@1080:     }
Chris@1079: 
Chris@1083:     int attainedWidth = renderDrawBuffer(repaintWidth,
Chris@1080:                                          h,
Chris@1080:                                          binforx,
Chris@1080:                                          binfory,
Chris@1080:                                          usePeaksCache,
Chris@1080:                                          rightToLeft,
Chris@1080:                                          timeConstrained);
Chris@1083: 
Chris@1083:     //!!! now scale-copy to cache
Chris@1084: 
Chris@1084:     if (attainedWidth == 0) return;
Chris@1084:     
Chris@1084:     int paintedLeft = x0;
Chris@1084:     if (rightToLeft) {
Chris@1084:         paintedLeft += (repaintWidth - attainedWidth);
Chris@1084:     }
Chris@1084: 
Chris@1084:     if (bufferIsBinResolution) {
Chris@1084: 
Chris@1084:         int scaledLeft = v->getXForFrame(leftBoundaryFrame);
Chris@1084:         int scaledRight = v->getXForFrame(rightBoundaryFrame);
Chris@1084: 
Chris@1084:         QImage scaled = m_drawBuffer.scaled
Chris@1084:             (scaledRight - scaledLeft, h,
Chris@1084:              Qt::IgnoreAspectRatio, (m_params.interpolate ?
Chris@1084:                                      Qt::SmoothTransformation :
Chris@1084:                                      Qt::FastTransformation));
Chris@1084:             
Chris@1084:         int scaledLeftCrop = v->getXForFrame(leftCropFrame);
Chris@1084:         int scaledRightCrop = v->getXForFrame(rightCropFrame);
Chris@1084: 
Chris@1084:         int targetLeft = scaledLeftCrop;
Chris@1084:         if (targetLeft < 0) {
Chris@1084:             targetLeft = 0;
Chris@1084:         }
Chris@1084: 
Chris@1084:         int targetWidth = scaledRightCrop - targetLeft;
Chris@1084:         if (targetLeft + targetWidth > m_cache.getSize().width()) {
Chris@1084:             targetWidth = m_cache.getSize().width() - targetLeft;
Chris@1084:         }
Chris@1084:             
Chris@1084:         int sourceLeft = targetLeft - scaledLeft;
Chris@1084:         if (sourceLeft < 0) {
Chris@1084:             sourceLeft = 0;
Chris@1084:         }
Chris@1084:             
Chris@1084:         int sourceWidth = targetWidth;
Chris@1084: 
Chris@1084:         if (targetWidth > 0) {
Chris@1084:             m_cache.drawImage(targetLeft, targetWidth,
Chris@1084:                               scaled,
Chris@1084:                               sourceLeft, sourceWidth);
Chris@1084:         }
Chris@1084: 
Chris@1084:     } else {
Chris@1084: 
Chris@1084:         m_cache.drawImage(paintedLeft, attainedWidth,
Chris@1084:                           m_drawBuffer,
Chris@1084:                           paintedLeft - x0, attainedWidth);
Chris@1084:     }
Chris@1079: }
Chris@1083: 
Chris@1083: int
Chris@1083: Colour3DPlotRenderer::renderDrawBuffer(int w, int h,
Chris@1083:                                        const vector<int> &binforx,
Chris@1083:                                        const vector<double> &binfory,
Chris@1083:                                        bool usePeaksCache,
Chris@1083:                                        bool rightToLeft,
Chris@1083:                                        bool timeConstrained)
Chris@1083: {
Chris@1083:     // Callers must have checked that the appropriate subset of
Chris@1083:     // Sources data members are set for the supplied flags (e.g. that
Chris@1083:     // peaks model exists if usePeaksCache)
Chris@1083:     
Chris@1083:     RenderTimer timer(timeConstrained ?
Chris@1083:                       RenderTimer::FastRender :
Chris@1083:                       RenderTimer::NoTimeout);
Chris@1083:     
Chris@1083:     int minbin = int(binfory[0] + 0.0001);
Chris@1083:     int maxbin = int(binfory[h-1]);
Chris@1083:     if (minbin < 0) minbin = 0;
Chris@1083:     if (maxbin < 0) maxbin = minbin+1;
Chris@1083: 
Chris@1083:     int divisor = 1;
Chris@1083:     DenseThreeDimensionalModel *sourceModel = m_sources.source;
Chris@1083:     if (usePeaksCache) {
Chris@1083:         divisor = m_sources.peaks->getColumnsPerPeak();
Chris@1083:         sourceModel = m_sources.peaks;
Chris@1083:     }
Chris@1083: 
Chris@1083:     int psx = -1;
Chris@1083: 
Chris@1083:     int start = 0;
Chris@1083:     int finish = w;
Chris@1083:     int step = 1;
Chris@1083: 
Chris@1083:     if (rightToLeft) {
Chris@1083:         start = w-1;
Chris@1083:         finish = -1;
Chris@1083:         step = -1;
Chris@1083:     }
Chris@1083: 
Chris@1083:     int columnCount = 0;
Chris@1083:     
Chris@1083:     vector<float> preparedColumn;
Chris@1083:             
Chris@1083:     for (int x = start; x != finish; x += step) {
Chris@1083: 
Chris@1083:         // x is the on-canvas pixel coord; sx (later) will be the
Chris@1083:         // source column index
Chris@1083:         
Chris@1083:         ++columnCount;
Chris@1083:         
Chris@1083:         if (binforx[x] < 0) continue;
Chris@1083: 
Chris@1083:         int sx0 = binforx[x] / divisor;
Chris@1083:         int sx1 = sx0;
Chris@1083:         if (x+1 < w) sx1 = binforx[x+1] / divisor;
Chris@1083:         if (sx0 < 0) sx0 = sx1 - 1;
Chris@1083:         if (sx0 < 0) continue;
Chris@1083:         if (sx1 <= sx0) sx1 = sx0 + 1;
Chris@1083: 
Chris@1083:         vector<float> pixelPeakColumn;
Chris@1083:         
Chris@1083:         for (int sx = sx0; sx < sx1; ++sx) {
Chris@1083: 
Chris@1083: #ifdef DEBUG_SPECTROGRAM_REPAINT
Chris@1083: //            cerr << "sx = " << sx << endl;
Chris@1083: #endif
Chris@1083: 
Chris@1083:             if (sx < 0 || sx >= sourceModel->getWidth()) {
Chris@1083:                 continue;
Chris@1083:             }
Chris@1083: 
Chris@1083:             if (sx != psx) {
Chris@1083: 
Chris@1083:                 // order:
Chris@1083:                 // get column -> scale -> record extents ->
Chris@1083:                 // normalise -> peak pick -> apply display gain ->
Chris@1083:                 // distribute/interpolate
Chris@1083: 
Chris@1083:                 ColumnOp::Column fullColumn = sourceModel->getColumn(sx);
Chris@1090: 
Chris@1090:                 cerr << "x " << x << ", sx " << sx << ", col height " << fullColumn.size()
Chris@1090:                      << ", minbin " << minbin << ", maxbin " << maxbin << endl;
Chris@1090:                 
Chris@1083:                 ColumnOp::Column column =
Chris@1083:                     vector<float>(fullColumn.data() + minbin,
Chris@1083:                                   fullColumn.data() + maxbin + 1);
Chris@1083: 
Chris@1083: //!!! fft scale                if (m_colourScale != PhaseColourScale) {
Chris@1083: //                    column = ColumnOp::fftScale(column, m_fftSize);
Chris@1083: //                }
Chris@1083: 
Chris@1083: //!!! extents                recordColumnExtents(column,
Chris@1083: //                                    sx,
Chris@1083: //                                    overallMag,
Chris@1083: //                                    overallMagChanged);
Chris@1083: 
Chris@1083: //                if (m_colourScale != PhaseColourScale) {
Chris@1083:                     column = ColumnOp::normalize(column, m_params.normalization);
Chris@1083: //                }
Chris@1083: 
Chris@1083:                 if (m_params.binDisplay == PeakBins) {
Chris@1083:                     column = ColumnOp::peakPick(column);
Chris@1083:                 }
Chris@1083: 
Chris@1083:                 preparedColumn =
Chris@1083:                     ColumnOp::distribute(column, //!!! gain? ColumnOp::applyGain(column, m_gain),
Chris@1083:                                          h,
Chris@1083:                                          binfory,
Chris@1083:                                          minbin,
Chris@1083:                                          m_params.interpolate);
Chris@1083:                 
Chris@1083:                 psx = sx;
Chris@1083:             }
Chris@1083: 
Chris@1083:             if (sx == sx0) {
Chris@1083:                 pixelPeakColumn = preparedColumn;
Chris@1083:             } else {
Chris@1083:                 for (int i = 0; in_range_for(pixelPeakColumn, i); ++i) {
Chris@1083:                     pixelPeakColumn[i] = std::max(pixelPeakColumn[i],
Chris@1083:                                                   preparedColumn[i]);
Chris@1083:                 }
Chris@1083:             }
Chris@1083:         }
Chris@1083: 
Chris@1083:         if (!pixelPeakColumn.empty()) {
Chris@1083:             for (int y = 0; y < h; ++y) {
Chris@1083:                 m_drawBuffer.setPixel
Chris@1083:                     (x,
Chris@1083:                      h-y-1,
Chris@1083:                      m_params.colourScale.getPixel(pixelPeakColumn[y]));
Chris@1083:             }
Chris@1083:         }
Chris@1083: 
Chris@1083:         double fractionComplete = double(columnCount) / double(w);
Chris@1083:         if (timer.outOfTime(fractionComplete)) {
Chris@1083:             return columnCount;
Chris@1083:         }
Chris@1083:     }
Chris@1083: 
Chris@1083:     return columnCount;
Chris@1083: }
Chris@1083: 
Chris@1079: void
Chris@1079: Colour3DPlotRenderer::clearDrawBuffer(int w, int h)
Chris@1079: {
Chris@1079:     if (m_drawBuffer.width() < w || m_drawBuffer.height() != h) {
Chris@1079: 
Chris@1079:         m_drawBuffer = QImage(w, h, QImage::Format_Indexed8);
Chris@1079: 
Chris@1079:         for (int pixel = 0; pixel < 256; ++pixel) {
Chris@1079:             //!!! todo: colour rotation (here 0)
Chris@1079:             m_drawBuffer.setColor
Chris@1079:                 ((unsigned char)pixel,
Chris@1079:                  m_params.colourScale.getColourForPixel(pixel, 0).rgb());
Chris@1079:         }
Chris@1079:     }
Chris@1079: 
Chris@1079:     m_drawBuffer.fill(0);
Chris@1079: }
Chris@1079: 
Chris@1079: