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visualisations: Properly scale projectM view

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In version 5.6, Qt introduced an automatic scaling feature for high DPI
displays. Since projectM is not part of the Qt framework, it's necessary
to convert coordinates when specifying view size.

Reference: https://doc.qt.io/qt-5/highdpi.html
This commit is contained in:
Jim Broadus 2021-04-07 13:05:37 -07:00 committed by John Maguire
parent 354f6a23e0
commit e8875faf83
2 changed files with 23 additions and 6 deletions
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19
src/visualisations/projectmvisualisation.cpp
View File

@ -48,12 +48,14 @@
#include <GL/gl.h> #include <GL/gl.h>
#endif #endif
ProjectMVisualisation::ProjectMVisualisation(QObject* parent) ProjectMVisualisation::ProjectMVisualisation(VisualisationContainer* container)
: QGraphicsScene(parent), : QGraphicsScene(container),
preset_model_(nullptr), preset_model_(nullptr),
mode_(Random), mode_(Random),
duration_(15), duration_(15),
texture_size_(512) { texture_size_(512),
pixel_ratio_(container->devicePixelRatio()),
container_(container) {
connect(this, SIGNAL(sceneRectChanged(QRectF)), connect(this, SIGNAL(sceneRectChanged(QRectF)),
SLOT(SceneRectChanged(QRectF))); SLOT(SceneRectChanged(QRectF)));
@ -143,14 +145,21 @@ void ProjectMVisualisation::drawBackground(QPainter* p, const QRectF&) {
InitProjectM(); InitProjectM();
} }
projectm_->projectM_resetGL(sceneRect().width(), sceneRect().height()); projectm_->projectM_resetGL(sceneRect().width() * pixel_ratio_,
sceneRect().height() * pixel_ratio_);
projectm_->renderFrame(); projectm_->renderFrame();
p->endNativePainting(); p->endNativePainting();
} }
void ProjectMVisualisation::SceneRectChanged(const QRectF& rect) { void ProjectMVisualisation::SceneRectChanged(const QRectF& rect) {
if (projectm_) projectm_->projectM_resetGL(rect.width(), rect.height()); // NOTE: This should be updated on a QScreen dpi change signal. Accessing the
// QScreen becomes a lot easier in Qt 5.14 with QWidget::screen().
pixel_ratio_ = container_->devicePixelRatio();
if (projectm_)
projectm_->projectM_resetGL(rect.width() * pixel_ratio_,
rect.height() * pixel_ratio_);
} }
void ProjectMVisualisation::SetTextureSize(int size) { void ProjectMVisualisation::SetTextureSize(int size) {

10
src/visualisations/projectmvisualisation.h
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@ -29,12 +29,14 @@ class projectM;
class ProjectMPresetModel; class ProjectMPresetModel;
class VisualisationContainer;
class QTemporaryFile; class QTemporaryFile;
class ProjectMVisualisation : public QGraphicsScene, public BufferConsumer { class ProjectMVisualisation : public QGraphicsScene, public BufferConsumer {
Q_OBJECT Q_OBJECT
public: public:
ProjectMVisualisation(QObject* parent = nullptr); ProjectMVisualisation(VisualisationContainer* container);
~ProjectMVisualisation(); ~ProjectMVisualisation();
enum Mode { enum Mode {
@ -87,6 +89,12 @@ class ProjectMVisualisation : public QGraphicsScene, public BufferConsumer {
std::vector<int> default_rating_list_; std::vector<int> default_rating_list_;
int texture_size_; int texture_size_;
// As of version 5.6, Qt supports automatic scaling for high-DPI displays. We
// need to know the pixel ratio so that we can convert coordinates for
// projectM.
// https://doc.qt.io/qt-5/highdpi.html
qreal pixel_ratio_;
VisualisationContainer* container_;
}; };
#endif // PROJECTMVISUALISATION_H #endif // PROJECTMVISUALISATION_H