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plot: Draw plot tiles in background thread

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Mike Walters
2016-03-27 04:00:37 +01:00
parent 43a77e8f6d
commit f20d99a4f8
5 changed files with 42 additions and 12 deletions
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30
traceplot.cpp
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@@ -19,11 +19,12 @@
#include <QPixmapCache>
#include <QTextStream>
#include <QtConcurrent>
#include "samplesource.h"
#include "traceplot.h"
TracePlot::TracePlot(std::shared_ptr<AbstractSampleSource> source) : sampleSource(source) {
connect(this, &TracePlot::imageReady, this, &TracePlot::handleImage);
}
void TracePlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRange)
@@ -52,19 +53,22 @@ void TracePlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRa
QPixmap TracePlot::getTile(off_t tileID, off_t sampleCount)
{
QPixmap pixmap;
QPixmap pixmap(tileWidth, height());
QString key;
QTextStream(&key) << "traceplot_" << this << "_" << tileID << "_" << sampleCount;
if (QPixmapCache::find(key, &pixmap))
return pixmap;
auto image = drawTile(QRect(0, 0, tileWidth, height()), {tileID * sampleCount, (tileID + 1) * sampleCount});
pixmap = QPixmap::fromImage(image);
QPixmapCache::insert(key, pixmap);
if (!tasks.contains(key)) {
range_t<off_t> sampleRange{tileID * sampleCount, (tileID + 1) * sampleCount};
QtConcurrent::run(this, &TracePlot::drawTile, key, QRect(0, 0, tileWidth, height()), sampleRange);
tasks.insert(key);
}
pixmap.fill(Qt::transparent);
return pixmap;
}
QImage TracePlot::drawTile(const QRect &rect, range_t<off_t> sampleRange)
void TracePlot::drawTile(QString key, const QRect &rect, range_t<off_t> sampleRange)
{
QImage image(rect.size(), QImage::Format_ARGB32);
image.fill(Qt::transparent);
@@ -79,7 +83,7 @@ QImage TracePlot::drawTile(const QRect &rect, range_t<off_t> sampleRange)
if (auto src = dynamic_cast<SampleSource<std::complex<float>>*>(sampleSource.get())) {
auto samples = src->getSamples(firstSample, length);
if (samples == nullptr)
return image;
return;
painter.setPen(Qt::red);
plotTrace(painter, rect, reinterpret_cast<float*>(samples.get()), length, 2);
@@ -90,7 +94,7 @@ QImage TracePlot::drawTile(const QRect &rect, range_t<off_t> sampleRange)
} else if (auto src = dynamic_cast<SampleSource<float>*>(sampleSource.get())) {
auto samples = src->getSamples(firstSample, length);
if (samples == nullptr)
return image;
return;
painter.setPen(Qt::green);
plotTrace(painter, rect, samples.get(), length, 1);
@@ -98,7 +102,15 @@ QImage TracePlot::drawTile(const QRect &rect, range_t<off_t> sampleRange)
throw std::runtime_error("TracePlot::paintMid: Unsupported source type");
}
return image;
emit imageReady(key, image);
}
void TracePlot::handleImage(QString key, QImage image)
{
auto pixmap = QPixmap::fromImage(image);
QPixmapCache::insert(key, pixmap);
tasks.remove(key);
emit repaint();
}
void TracePlot::plotTrace(QPainter &painter, const QRect &rect, float *samples, off_t count, int step = 1)