statistics: draw legend as a QSGNode

In order not to waste CPU by constantly rerendering the chart,
we must use these weird OpenGL QSGNode things. The interface
is appallingly low-level and unfriendly.

As a first test, try to convert the legend. Create a wrapper
class that represents a rectangular item with a texture
and that will certainly need some (lots of) optimization.

Make sure that all low-level QSG-objects are only accessed
in the rendering thread. This means that the wrapper has
to maintain a notion of "dirtiness" of the state. I.e.
which part of the QSG-objects have to be modified.

From the low-level wrapper derive a class that draws a rounded
rectangle for every resize. The child class of that must then
paint on the rectangle after every resize.

That looks all not very fortunate, but it displays a
legend and will make it possible to move the legend
without and drawing operations, only shifting around
an OpenGL surface.

The render thread goes through all chart-items and
rerenders them if dirty. Currently, on deletion
of these items, this list is not reset. I.e. currently
it is not supported to remove individual items.
Only the full scene can be cleared!

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

1 files changed, 107 insertions, 0 deletions

diff --git a/stats/chartitem.cpp b/stats/chartitem.cpp
new file mode 100644
index 000000000..c0fc50841
--- /dev/null
+++ b/stats/chartitem.cpp
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "chartitem.h"
+#include "statsview.h"
+
+#include <cmath>
+#include <QQuickWindow>
+#include <QSGImageNode>
+#include <QSGTexture>
+
+static int round_up(double f)
+{
+	return static_cast<int>(ceil(f));
+}
+
+ChartItem::ChartItem(StatsView &v) :
+	dirty(false), view(v), positionDirty(false), textureDirty(false)
+{
+}
+
+ChartItem::~ChartItem()
+{
+	painter.reset(); // Make sure to destroy painter before image that is painted on
+	view.unregisterChartItem(this);
+}
+
+QSizeF ChartItem::sceneSize() const
+{
+	return view.size();
+}
+
+void ChartItem::setTextureDirty()
+{
+	textureDirty = true;
+	dirty = true;
+}
+
+void ChartItem::setPositionDirty()
+{
+	positionDirty = true;
+	dirty = true;
+}
+
+void ChartItem::render()
+{
+	if (!dirty)
+		return;
+	if (!node) {
+		node.reset(view.w()->createImageNode());
+		view.addQSGNode(node.get(), 0);
+	}
+	if (!img) {
+		resize(QSizeF(1,1));
+		img->fill(Qt::transparent);
+	}
+	if (textureDirty) {
+		texture.reset(view.w()->createTextureFromImage(*img, QQuickWindow::TextureHasAlphaChannel));
+		node->setTexture(texture.get());
+		textureDirty = false;
+	}
+	if (positionDirty) {
+		node->setRect(rect);
+		positionDirty = false;
+	}
+	dirty = false;
+}
+
+void ChartItem::resize(QSizeF size)
+{
+	painter.reset();
+	img.reset(new QImage(round_up(size.width()), round_up(size.height()), QImage::Format_ARGB32));
+	painter.reset(new QPainter(img.get()));
+	painter->setRenderHint(QPainter::Antialiasing);
+	rect.setSize(size);
+	setTextureDirty();
+}
+
+void ChartItem::setPos(QPointF pos)
+{
+	rect.moveTopLeft(pos);
+	setPositionDirty();
+}
+
+QRectF ChartItem::getRect() const
+{
+	return rect;
+}
+
+ChartRectItem::ChartRectItem(StatsView &v, const QPen &pen, const QBrush &brush, double radius) : ChartItem(v),
+	pen(pen), brush(brush), radius(radius)
+{
+}
+
+ChartRectItem::~ChartRectItem()
+{
+}
+
+void ChartRectItem::resize(QSizeF size)
+{
+	ChartItem::resize(size);
+	img->fill(Qt::transparent);
+	painter->setPen(pen);
+	painter->setBrush(brush);
+	QSize imgSize = img->size();
+	int width = pen.width();
+	QRect rect(width / 2, width / 2, imgSize.width() - width, imgSize.height() - width);
+	painter->drawRoundedRect(rect, radius, radius, Qt::AbsoluteSize);
+}