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plot: Cache tile pixmaps

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Mike Walters
2016-03-26 03:46:36 +00:00
parent 8ad24ac48f
commit 270f44ccbe
3 changed files with 20 additions and 5 deletions
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19
traceplot.cpp
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@@ -17,6 +17,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <QPixmapCache>
#include <QTextStream>
#include "samplesource.h"
#include "traceplot.h"
@@ -33,7 +35,7 @@ void TracePlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRa
int xOffset = tileOffset / samplesPerColumn; // Number of columns to skip from first image tile
// Paint first (possibly partial) tile
painter.drawImage(
painter.drawPixmap(
QRect(rect.x(), rect.y(), tileWidth - xOffset, height()),
getTile(tileID++, samplesPerTile),
QRect(xOffset, 0, tileWidth - xOffset, height())
@@ -41,16 +43,25 @@ void TracePlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sampleRa
// Paint remaining tiles
for (int x = tileWidth - xOffset; x < rect.right(); x += tileWidth) {
painter.drawImage(
painter.drawPixmap(
QRect(x, rect.y(), tileWidth, height()),
getTile(tileID++, samplesPerTile)
);
}
}
QImage TracePlot::getTile(off_t tileID, off_t sampleCount)
QPixmap TracePlot::getTile(off_t tileID, off_t sampleCount)
{
return drawTile(QRect(0, 0, tileWidth, height()), {tileID * sampleCount, (tileID + 1) * sampleCount});
QPixmap pixmap;
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);
return pixmap;
}
QImage TracePlot::drawTile(const QRect &rect, range_t<off_t> sampleRange)