QT6 color handling changes

* use typedef for floating point value used in color related API
* changes in screen grabbing API used by color picker

src/common/ColorThemeWorker.cpp

@@ -51,9 +51,9 @@ ColorThemeWorker::ColorThemeWorker(QObject *parent) : QObject(parent)
 
 QColor ColorThemeWorker::mergeColors(const QColor &upper, const QColor &lower) const
 {
-    qreal r1, g1, b1, a1;
-    qreal r2, g2, b2, a2;
-    qreal r, g, b, a;
+    qhelpers::ColorFloat r1, g1, b1, a1;
+    qhelpers::ColorFloat r2, g2, b2, a2;
+    qhelpers::ColorFloat r, g, b, a;
 
     upper.getRgbF(&r1, &g1, &b1, &a1);
     lower.getRgbF(&r2, &g2, &b2, &a2);

src/common/Helpers.h

@@ -85,6 +85,12 @@ CUTTER_EXPORT void selectIndexByData(QComboBox *comboBox, QVariant data, int def
 CUTTER_EXPORT void emitColumnChanged(QAbstractItemModel *model, int column);
 
 CUTTER_EXPORT bool filterStringContains(const QString &string, const QSortFilterProxyModel *model);
+
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+using ColorFloat = float;
+#else
+using ColorFloat = qreal;
+#endif
 } // qhelpers
 
 #endif // HELPERS_H

src/widgets/ColorPicker.cpp

@@ -1,11 +1,16 @@
 #include "ColorPicker.h"
 #include "ui_ColorPicker.h"
+#include "common/Helpers.h"
 
 #include <QPaintEvent>
 #include <QPainter>
 #include <QPainterPath>
 #include <QMouseEvent>
-#include <QDesktopWidget>
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+#    include <QDesktopWidget>
+#else
+#    include <QWindow>
+#endif
 #include <QPixmap>
 #include <QCursor>
 #include <QScreen>
@@ -23,7 +28,7 @@ void ColorPickArea::paintEvent(QPaintEvent *event)
 
     for (int x = event->rect().x(); x <= event->rect().right(); x++) {
         for (int y = event->rect().y(); y <= event->rect().bottom(); y++) {
-            qreal h, s, v;
+            qhelpers::ColorFloat h, s, v;
             QColor c = pointToColor(x, y);
             c.getHsvF(&h, &s, &v);
             c.setHsvF(h, s, 1);
@@ -74,7 +79,7 @@ void ColorPickerWidget::mouseMoveEvent(QMouseEvent *event)
 QColor ColorPickArea::pointToColor(int x, int y) const
 {
     QColor color;
-    qreal h, s, v, a;
+    qhelpers::ColorFloat h, s, v, a;
     currColor.getHsvF(&h, &s, &v, &a);
     color.setHsvF(qreal(x) / width(), 1.0 - qreal(y) / height(), v, a);
     return color;
@@ -82,7 +87,7 @@ QColor ColorPickArea::pointToColor(int x, int y) const
 
 QPoint ColorPickArea::colorToPoint(const QColor &color) const
 {
-    qreal h, s, v;
+    qhelpers::ColorFloat h, s, v;
     color.getHsvF(&h, &s, &v);
     return QPointF(h * width(), (1.0 - s) * height()).toPoint();
 }
@@ -114,7 +119,7 @@ void ColorValueBar::paintEvent(QPaintEvent *event)
 {
     QPainter p(this);
     QColor color = currColor;
-    qreal h, s, v;
+    qhelpers::ColorFloat h, s, v;
     currColor.getHsvF(&h, &s, &v);
     v = 1.0 - v;
 
@@ -147,7 +152,7 @@ QColor ColorValueBar::pointToColor(int x, int y) const
 {
     Q_UNUSED(x)
     QColor color = currColor;
-    qreal h, s, v, a;
+    qhelpers::ColorFloat h, s, v, a;
     color.getHsvF(&h, &s, &v, &a);
     color.setHsvF(h, s, 1.0 - qreal(y) / height(), a);
     return color;
@@ -155,7 +160,7 @@ QColor ColorValueBar::pointToColor(int x, int y) const
 
 QPoint ColorValueBar::colorToPoint(const QColor &color) const
 {
-    qreal h, s, v;
+    qhelpers::ColorFloat h, s, v;
     color.getHsvF(&h, &s, &v);
     return QPoint(rect().x(), int((1.0 - v) * height()));
 }
@@ -308,12 +313,27 @@ void ColorPicker::mouseMoveEvent(QMouseEvent *event)
 
 QColor ColorPicker::getColorAtMouse()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     const QDesktopWidget *desktop = QApplication::desktop();
     const QPixmap pixmap =
             QGuiApplication::screens()
                     .at(desktop->screenNumber())
                     ->grabWindow(desktop->winId(), QCursor::pos().x(), QCursor::pos().y(), 1, 1);
     return QColor(pixmap.toImage().pixel(0, 0));
+#else
+    QPoint pos = QCursor::pos();
+    auto screen = QGuiApplication::screenAt(pos);
+    if (!screen) {
+        screen = QGuiApplication::primaryScreen();
+    }
+    if (screen) {
+        auto screenRelativePos = pos - screen->geometry().topLeft();
+        const QPixmap pixmap =
+                screen->grabWindow(0, screenRelativePos.x(), screenRelativePos.y(), 1, 1);
+        return QColor(pixmap.toImage().pixel(0, 0));
+    }
+    return QColorConstants::Red;
+#endif
 }
 
 bool ColorPicker::isPickingFromScreen() const
@@ -378,7 +398,7 @@ void AlphaChannelBar::paintEvent(QPaintEvent *event)
     QPainter p(this);
     QRect barRect = rect();
 
-    qreal h, s, v, a;
+    qhelpers::ColorFloat h, s, v, a;
     currColor.getHsvF(&h, &s, &v, &a);
     a = 1.0 - a;
     const int triangleSize = 10;
@@ -416,7 +436,7 @@ QColor AlphaChannelBar::pointToColor(int x, int y) const
 {
     Q_UNUSED(x)
     QColor color = currColor;
-    qreal h, s, v;
+    qhelpers::ColorFloat h, s, v;
     color.getHsvF(&h, &s, &v);
     color.setHsvF(h, s, v, 1.0 - qreal(y) / height());
     return color;